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Patent
Enn Coal Gasification Mining Co. | Date: 2017-02-22

A coal co-gasification method, comprising the following steps: 1, fuel and a first pressurised oxygen-containing gas are injected into a gasifier, and the fuel is ignited so as to increase the temperature inside the gasifier; 2, when the temperature increase reaches a temperature capable of igniting powdered coal to be injected, injection of the fuel is stopped, injection of the first pressurised oxygen-containing gas is continued, and a pressurised carbon dioxide gas carrying the powdered coal to be injected is injected into the gasifier so as to perform powdered coal gasification; 3, once the powdered coal gasification has stabilised, coal-water slurry and an oxygen-containing gas are injected into the gasifier to perform co-gasification. The method operates stably, and overcomes cumbersome and time-consuming adjustment steps in the prior art.

Claims which contain your search:

1. A method for co-gasification of coal, comprising the following steps:step 1: injecting fuel and a first pressurized oxygen-containing gas into a gasifier, and igniting the fuel for temperature rise inside the gasifier;step 2: when the temperature rise reaches an extent at which pulverized coal to be injected can be ignited, stopping injecting the fuel, and maintaining injection of the first pressurized oxygen-containing gas; and injecting pressurized carbon dioxide gas carrying the pulverized coal to be injected into the gasifier for gasification of pulverized coal; andstep 3: after the gasification of the pulverized coal is stable, injecting coal water slurry and a second pressurized oxygen-containing gas into the gasifier for co-gasification.

2. The method for co-gasification of coal according to claim 1, wherein,in the step 2, an oxygen-coal ratio of the injected first pressurized oxygen-containing gas to the pulverized coal to be injected is within a range from 0.49 Nm^(3)/kg to 0.65 Nm^(3)/kg.

3. The method for co-gasification of coal according to claim 1, wherein,in the step 3, an oxygen-coal ratio of the injected second pressurized oxygen-containing gas to the coal water slurry is within a range from 0.54 Nm^(3)/kg to 0.70 Nm^(3)/kg.

4. The method for co-gasification of coal according to claim 1, wherein,in the step 3: the coal water slurry and the second pressurized oxygen-containing gas are injected by a first burner provided on a side wall of the gasifier;wherein a mass flow of the coal water slurry is greater than or equal to 70% of a load of the first burner.

5. The method for co-gasification of coal according to any one of claims 1 to 4, wherein,the step 3 further comprises the following steps:controlling, by adjusting the oxygen-coal ratio of the first pressurized oxygen-containing gas to the pulverized coal to be injected within a range from 0.49 Nm^(3)/kg to 0.65 Nm^(3)/kg and/or adjusting the oxygen-coal ratio of the second pressurized oxygen-containing gas to the coal water slurry within a range from 0.54 Nm^(3)/kg to 0.70 Nm^(3)/kg, an operating temperature of the gasifier.

6. The method for co-gasification of coal according to claim 5, wherein,in the gasifier with water wall, the operating temperature of the gasifier is controlled within a range from 1400C to 1600C; andin the firebrick gasifier, the operating temperature of the gasifier is controlled within a range from 1300C to 1400C.

7. The method for co-gasification of coal according to any one of claims 1 to 4, wherein,the step 3 further comprises the following steps:controlling, by increasing or decreasing a volume flow of oxygen in the first pressurized oxygen-containing gas, a mass flow of the pulverized coal to be injected, a volume flow of oxygen in the second pressurized oxygen-containing gas and a mass flow of coal in the coal water slurry in an equal proportion, an operating pressure of the gasifier.

8. The method for co-gasification of coal according to claim 7, wherein,in the gasifier with water wall, the operating pressure of the gasifier is controlled within a range from 4.5 MPa to 7.0 MPa; andin the firebrick gasifier, the operating pressure of the gasifier is controlled within a range from 4.5 MPa to 7.0 MPa.

9. The method for co-gasification of coal according to claim 1, wherein,in the step 1:by adjusting an injection flow of the fuel and the first pressurized oxygen-containing gas, speed of the temperature rise is controlled to be lower than or equal to 50 C/h.

10. The method for co-gasification of coal according to claim 1, wherein,the temperature at which pulverized coal to be injected can be ignited is greater than or equal to 400C.

11. The method for co-gasification of coal according to claim 1, wherein,in the step 1, the first pressurized oxygen-containing gas and the fuel are injected into the gasifier respectively by isolated passages of a second burner provided on the top of the gasifier; andin the step 2, the pressurized carbon dioxide gas carrying pulverized coal and the first pressurized oxygen-containing gas are injected into the gasifier respectively by isolated passages of the second burner.

12. The method for co-gasification of coal according to claim 1, wherein,when gasification of the pulverized coal of the step 2 is performed, a black water circulation system of the gasifier is started.

13. The method for co-gasification of coal according to claim 1, wherein,the fuel is fuel oil or fuel gas, and the first pressurized oxygen-containing gas and the second pressurized oxygen-containing gas are both pressurized oxygen;wherein when the fuel is fuel oil, the fuel oil, after being atomized, is injected into the gasifier.

...

Patent
Enn Coal Gasification Mining Co. | Date: 2017-02-22

A coal co-gasification method, comprising the following steps: 1, fuel and a first pressurised oxygen-containing gas are injected into a gasifier, and the fuel is ignited so as to increase the temperature inside the gasifier; 2, when the temperature increase reaches a temperature capable of igniting coal-water slurry to be injected, injection of the fuel and the first pressurised oxygen-containing gas is stopped, and the coal-water slurry and a second pressurised oxygen-containing gas are injected into the gasifier so as to perform coal-water slurry gasification; 3, once the coal-water slurry gasification has stabilised, a third pressurised oxygen-containing gas and carbon dioxide carrying powdered coal are injected into the gasifier to perform co-gasification. The method operates stably, and overcomes cumbersome and time-consuming adjustment steps in the prior art.

Claims which contain your search:

1. A method for co-gasification of coal, comprising the following steps:step 1: injecting fuel and a first pressurized oxygen-containing gas into a gasifier, and igniting the fuel for temperature rise inside the gasifier;step 2: when the temperature rise reaches an extent at which coal water slurry to be injected can be ignited, stopping injecting the fuel and the first pressurized oxygen-containing gas; and injecting the coal water slurry to be injected and a second pressurized oxygen-containing gas into the gasifier for gasification of the coal water slurry; andstep 3: after the gasification of the coal water slurry is stable, injecting a third second pressurized oxygen-containing gas and a pressurized carbon dioxide gas carrying pulverized coal into the gasifier for co-gasification.

2. The method for co-gasification of coal according to claim 1, wherein,in the step 2, an oxygen-coal ratio of the injected second pressurized oxygen-containing gas to the coal water slurry is within a range from 0.54 Nm^(3)/kg to 0.70 Nm^(3)/kg.

3. The method for co-gasification of coal according to claim 1, wherein,in the step 3, an oxygen-coal ratio of the injected third pressurized oxygen-containing gas to the pulverized coal is within a range from 0.49 Nm^(3)/kg to 0.65 Nm^(3)/kg.

4. The method for co-gasification of coal according to claim 1, wherein,the fuel and the first pressurized oxygen-containing gas in the step 1 are injected into the gasifier by an ignition burner provided on the top of the gasifier.

5. The method for co-gasification of coal according to claim 4, wherein,the step 2 further comprises the following steps:step 2.1: when the temperature rise reaches an extent at which the coal water slurry to be injected can be ignited, stopping injecting the fuel and the first pressurized oxygen-containing gas;step 2.2: replacing the ignition burner with a pulverized coal burner, and starting a high-temperature resistant protection system for the pulverized coal burner;step 2.3: mounting a furnace-side burner on a side wall of the gasifier, and starting ahigh-temperature resistant protection system for the furnace-side burner; andstep 2.4: injecting the coal water slurry to be injected and the second pressurized oxygen-containing gas to the gasifier by the furnace-side burner for gasification of the coal water slurry.

6. The method for co-gasification of coal according to claim 5, wherein,in the step 3, the third pressurized oxygen-containing gas and the pressurized carbon dioxide gas carrying pulverized coal are injected into the gasifier by the pulverized coal burner.

7. The method for co-gasification of coal according to claim 5, wherein,a mass flow of the coal water slurry to be injected is greater than or equal to 70% of a load of the furnace-side burner.

8. The method for co-gasification of coal according to claim 5, wherein,in the step 2.4, when gasification of the coal water slurry is performed, a black water circulation system of the gasifier is started.

9. The method for co-gasification of coal according to any one of claims 1 to 8, wherein,the step 3 further comprises the following steps:controlling, by adjusting the oxygen-coal ratio of the third pressurized oxygen-containing gas to the pulverized coal within a range from 0.49 Nm^(3)/kg to 0.65 Nm^(3)/kg and/or by adjusting the oxygen-coal ratio of the second pressurized oxygen-containing gas to the coal water slurry to be injected within a range from 0.54 Nm^(3)/kg to 0.70 Nm^(3)/kg, an operating temperature of the gasifier.

10. The method for co-gasification of coal according to claim 9, wherein,in the gasifier with water wall, the operating temperature of the gasifier is controlled within a range from 1400C to 1600C; andin the firebrick gasifier, the operating temperature of the gasifier is controlled within a range from 1300C to 1400C.

11. The method for co-gasification of coal according to any one of claims 1 to 8, wherein,the step 3 further comprises the following steps:controlling, by increasing or decreasing a volume flow of oxygen in the third pressurized oxygen-containing gas, a mass flow of the pulverized coal, a volume flow of oxygen in the second pressurized oxygen-containing gas and a mass flow of coal in the coal water slurry to be injected in an equal proportion, an operating pressure of the gasifier.

12. The method for co-gasification of coal according to claim 11, wherein,in the gasifier with water wall, the operating pressure of the gasifier is controlled within a range from 4.5 MPa to 7.0 MPa; andin the firebrick gasifier, the operating pressure of the gasifier is controlled within a range from 4.5 MPa to 7.0 MPa.

13. The method for co-gasification of coal according to any one of claims 1, 4, 5 and 6, wherein,in the step 1:by adjusting an injection flow of the fuel and the first pressurized oxygen-containing gas, speed of the temperature rise is controlled to be lower than or equal to 50 C/h.

14. The method for co-gasification of coal according to any one of claims 1, 4, 5 and 6, wherein,the temperature at which the coal water slurry to be injected can be ignited is greater than or equal to 1000C.

15. The method for co-gasification of coal according to claim 6, wherein,in the step 1, the first pressurized oxygen-containing gas and the fuel are injected into the gasifier by isolated passages of the ignition burner; andin the step 3, the third pressurized oxygen-containing gas and the pressurized carbon dioxide gas carrying pulverized coal are injected into the gasifier by isolated passages of the pulverized coal burner.

16. The method for co-gasification of coal according to any one of claims 1, 4, 5 and 6, wherein,the fuel is fuel oil or fuel gas, the first pressurized oxygen-containing gas, the second pressurized oxygen-containing gas and the third pressurizedoxygen-containing gas are all pressurized oxygen;wherein when the fuel is fuel oil, the fuel oil, after being atomized, is injected into the gasifier.

...
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Name Score Publications Conferences Grants Patents Trademarks News Webs
707.9 10 10 10 10 10 10 10
388.3 10 10 10 10 10 10 10
308.7 10 10 10 10 10 10 10
306.1 10 10 10 10 10 10 10
290.5 10 10 10 10 10 10 10
263.6 10 10 10 10 10 10 10
239.0 10 10 10 10 10 10 10
216.5 10 10 10 10 10 10 10
206.3 10 10 10 10 10 10 10
204.2 10 10 10 10 10 10 10
193.9 10 10 10 10 10 10 10
191.0 10 10 10 10 10 10 10
177.7 10 10 10 10 10 10 10
163.8 10 10 10 10 10 10 10
157.3 10 10 10 10 10 10 10
148.1 10 10 10 10 10 10 10
141.7 10 10 10 10 10 10 10
141.4 10 10 10 10 10 10 10
137.6 10 10 10 10 10 10 10
137.4 10 10 10 10 10 10 10
137.0 10 10 10 10 10 10 10
136.3 10 10 10 10 10 10 10
134.9 10 10 10 10 10 10 10
134.6 10 10 10 10 10 10 10
129.4 10 10 10 10 10 10 10
123.4 10 10 10 10 10 10 10
120.4 10 10 10 10 10 10 10
118.0 10 10 10 10 10 10 10
116.0 10 10 10 10 10 10 10
104.6 10 10 10 10 10 10 10
97.6 10 10 10 10 10 10 10
97.6 10 10 10 10 10 10 10
96.7 10 10 10 10 10 10 10
96.6 10 10 10 10 10 10 10
96.0 10 10 10 10 10 10 10
95.7 10 10 10 10 10 10 10
94.6 10 10 10 10 10 10 10
91.0 10 10 10 10 10 10 10
90.3 10 10 10 10 10 10 10
90.1 10 10 10 10 10 10 10
87.7 10 10 10 10 10 10 10
87.0 10 10 10 10 10 10 10
85.2 10 10 10 10 10 10 10
83.7 10 10 10 10 10 10 10
81.0 10 10 10 10 10 10 10
77.1 10 10 10 10 10 10 10
76.3 10 10 10 10 10 10 10
74.7 10 10 10 10 10 10 10
74.4 10 10 10 10 10 10 10
72.2 10 10 10 10 10 10 10
68.6 10 10 10 10 10 10 10
67.7 10 10 10 10 10 10 10
67.0 10 10 10 10 10 10 10
66.1 10 10 10 10 10 10 10
64.8 10 10 10 10 10 10 10
62.1 10 10 10 10 10 10 10
61.6 10 10 10 10 10 10 10
61.1 10 10 10 10 10 10 10
59.4 10 10 10 10 10 10 10
58.2 10 10 10 10 10 10 10
National Cheng Kung University
57.7 8 3 - 10 10 10 10
Sotacarbo S.p.A.
54.9 12 1 - 10 10 10 10
Carbon Energy Ltd
54.7 - - - 10 10 10 10
University of British Columbia
54.4 14 1 - 10 10 10 10
West Virginia University
54.3 23 27 1 10 10 10 10
Indian Institute of Technology Guwahati
53.1 9 - - 10 10 10 10
Guradoor S.L.
53.1 - - - 10 10 10 10
ENN Group
51.4 18 6 - 10 10 10 10
University of Naples Federico II
50.6 12 - - 10 10 10 10
Sungkyunkwan University
50.3 10 1 - 10 10 10 10
University of Malaya
50.0 5 - - 10 10 10 10
Ohio State University
49.0 9 8 - 10 10 10 10
Ajou University
48.5 17 3 - 10 10 10 10
TUBITAK - Marmara Research Center
47.5 4 4 - 10 10 10 10
University of California at Irvine
47.3 7 - - 10 10 10 10
Uhde GmbH
46.7 1 - - 10 10 10 10
Lanzatech
46.5 - - - 10 10 10 10
Japan National Institute of Advanced Industrial Science and Technology
46.5 14 12 - 10 10 10 10
Tohoku University
46.2 10 1 - 10 10 10 10
Organo Corporation
44.5 - - - 10 10 10 10
U.S. Department of Energy
44.0 5 3 - 10 10 10 10
Tokyo University of Science
43.8 16 1 - 10 10 10 10
North China Electrical Power University
43.3 28 8 - 10 10 10 10
University of Queensland
42.6 10 3 - 10 10 10 10
Chongqing University
41.2 13 1 - 10 10 10 10
Technical University of Delft
40.3 11 1 1 10 10 10 10
Pennsylvania State University
40.2 19 13 - 10 10 10 10
China University of Petroleum - Beijing
40.1 10 2 - 10 10 10 10
McMaster University
39.0 7 1 - 10 10 10 10
University of Science and Technology Beijing
38.8 25 10 - 10 10 10 10
GreatPoint Energy
38.6 - - - 10 10 10 10
Linc Inc
38.1 2 - - 10 10 10 10
TU Munich
38.0 12 1 - 10 10 10 10
CNR Institute for Research on Combustion
37.6 17 - - 10 10 10 10
TU Berlin
37.3 5 6 1 10 10 10 10
Niigata University
37.2 4 2 - 10 10 10 10
Reaction Engineering International
37.1 1 2 3 10 10 10 10
SK Innovation Co.
36.8 - 2 - 10 10 10 10
Purdue University
36.6 5 10 2 10 10 10 10
POSCO
36.3 2 - - 10 10 10 10

Patent
Enn Coal Gasification Mining Co. | Date: 2017-02-22

A coal co-gasification method, comprising the following steps: 1, fuel and a first pressurised oxygen-containing gas are injected into a gasifier, and the fuel is ignited so as to increase the temperature inside the gasifier; 2, when the temperature increase reaches a temperature capable of igniting powdered coal to be injected, injection of the fuel is stopped, injection of the first pressurised oxygen-containing gas is continued, and a pressurised carbon dioxide gas carrying the powdered coal to be injected is injected into the gasifier so as to perform powdered coal gasification; 3, once the powdered coal gasification has stabilised, coal-water slurry and an oxygen-containing gas are injected into the gasifier to perform co-gasification. The method operates stably, and overcomes cumbersome and time-consuming adjustment steps in the prior art.

Claims which contain your search:

1. A method for co-gasification of coal, comprising the following steps:step 1: injecting fuel and a first pressurized oxygen-containing gas into a gasifier, and igniting the fuel for temperature rise inside the gasifier;step 2: when the temperature rise reaches an extent at which pulverized coal to be injected can be ignited, stopping injecting the fuel, and maintaining injection of the first pressurized oxygen-containing gas; and injecting pressurized carbon dioxide gas carrying the pulverized coal to be injected into the gasifier for gasification of pulverized coal; andstep 3: after the gasification of the pulverized coal is stable, injecting coal water slurry and a second pressurized oxygen-containing gas into the gasifier for co-gasification.

2. The method for co-gasification of coal according to claim 1, wherein,in the step 2, an oxygen-coal ratio of the injected first pressurized oxygen-containing gas to the pulverized coal to be injected is within a range from 0.49 Nm^(3)/kg to 0.65 Nm^(3)/kg.

3. The method for co-gasification of coal according to claim 1, wherein,in the step 3, an oxygen-coal ratio of the injected second pressurized oxygen-containing gas to the coal water slurry is within a range from 0.54 Nm^(3)/kg to 0.70 Nm^(3)/kg.

4. The method for co-gasification of coal according to claim 1, wherein,in the step 3: the coal water slurry and the second pressurized oxygen-containing gas are injected by a first burner provided on a side wall of the gasifier;wherein a mass flow of the coal water slurry is greater than or equal to 70% of a load of the first burner.

5. The method for co-gasification of coal according to any one of claims 1 to 4, wherein,the step 3 further comprises the following steps:controlling, by adjusting the oxygen-coal ratio of the first pressurized oxygen-containing gas to the pulverized coal to be injected within a range from 0.49 Nm^(3)/kg to 0.65 Nm^(3)/kg and/or adjusting the oxygen-coal ratio of the second pressurized oxygen-containing gas to the coal water slurry within a range from 0.54 Nm^(3)/kg to 0.70 Nm^(3)/kg, an operating temperature of the gasifier.

6. The method for co-gasification of coal according to claim 5, wherein,in the gasifier with water wall, the operating temperature of the gasifier is controlled within a range from 1400C to 1600C; andin the firebrick gasifier, the operating temperature of the gasifier is controlled within a range from 1300C to 1400C.

7. The method for co-gasification of coal according to any one of claims 1 to 4, wherein,the step 3 further comprises the following steps:controlling, by increasing or decreasing a volume flow of oxygen in the first pressurized oxygen-containing gas, a mass flow of the pulverized coal to be injected, a volume flow of oxygen in the second pressurized oxygen-containing gas and a mass flow of coal in the coal water slurry in an equal proportion, an operating pressure of the gasifier.

8. The method for co-gasification of coal according to claim 7, wherein,in the gasifier with water wall, the operating pressure of the gasifier is controlled within a range from 4.5 MPa to 7.0 MPa; andin the firebrick gasifier, the operating pressure of the gasifier is controlled within a range from 4.5 MPa to 7.0 MPa.

9. The method for co-gasification of coal according to claim 1, wherein,in the step 1:by adjusting an injection flow of the fuel and the first pressurized oxygen-containing gas, speed of the temperature rise is controlled to be lower than or equal to 50 C/h.

10. The method for co-gasification of coal according to claim 1, wherein,the temperature at which pulverized coal to be injected can be ignited is greater than or equal to 400C.

11. The method for co-gasification of coal according to claim 1, wherein,in the step 1, the first pressurized oxygen-containing gas and the fuel are injected into the gasifier respectively by isolated passages of a second burner provided on the top of the gasifier; andin the step 2, the pressurized carbon dioxide gas carrying pulverized coal and the first pressurized oxygen-containing gas are injected into the gasifier respectively by isolated passages of the second burner.

12. The method for co-gasification of coal according to claim 1, wherein,when gasification of the pulverized coal of the step 2 is performed, a black water circulation system of the gasifier is started.

13. The method for co-gasification of coal according to claim 1, wherein,the fuel is fuel oil or fuel gas, and the first pressurized oxygen-containing gas and the second pressurized oxygen-containing gas are both pressurized oxygen;wherein when the fuel is fuel oil, the fuel oil, after being atomized, is injected into the gasifier.


Patent
Enn Coal Gasification Mining Co. | Date: 2017-02-22

A coal co-gasification method, comprising the following steps: 1, fuel and a first pressurised oxygen-containing gas are injected into a gasifier, and the fuel is ignited so as to increase the temperature inside the gasifier; 2, when the temperature increase reaches a temperature capable of igniting coal-water slurry to be injected, injection of the fuel and the first pressurised oxygen-containing gas is stopped, and the coal-water slurry and a second pressurised oxygen-containing gas are injected into the gasifier so as to perform coal-water slurry gasification; 3, once the coal-water slurry gasification has stabilised, a third pressurised oxygen-containing gas and carbon dioxide carrying powdered coal are injected into the gasifier to perform co-gasification. The method operates stably, and overcomes cumbersome and time-consuming adjustment steps in the prior art.

Claims which contain your search:

1. A method for co-gasification of coal, comprising the following steps:step 1: injecting fuel and a first pressurized oxygen-containing gas into a gasifier, and igniting the fuel for temperature rise inside the gasifier;step 2: when the temperature rise reaches an extent at which coal water slurry to be injected can be ignited, stopping injecting the fuel and the first pressurized oxygen-containing gas; and injecting the coal water slurry to be injected and a second pressurized oxygen-containing gas into the gasifier for gasification of the coal water slurry; andstep 3: after the gasification of the coal water slurry is stable, injecting a third second pressurized oxygen-containing gas and a pressurized carbon dioxide gas carrying pulverized coal into the gasifier for co-gasification.

2. The method for co-gasification of coal according to claim 1, wherein,in the step 2, an oxygen-coal ratio of the injected second pressurized oxygen-containing gas to the coal water slurry is within a range from 0.54 Nm^(3)/kg to 0.70 Nm^(3)/kg.

3. The method for co-gasification of coal according to claim 1, wherein,in the step 3, an oxygen-coal ratio of the injected third pressurized oxygen-containing gas to the pulverized coal is within a range from 0.49 Nm^(3)/kg to 0.65 Nm^(3)/kg.

4. The method for co-gasification of coal according to claim 1, wherein,the fuel and the first pressurized oxygen-containing gas in the step 1 are injected into the gasifier by an ignition burner provided on the top of the gasifier.

5. The method for co-gasification of coal according to claim 4, wherein,the step 2 further comprises the following steps:step 2.1: when the temperature rise reaches an extent at which the coal water slurry to be injected can be ignited, stopping injecting the fuel and the first pressurized oxygen-containing gas;step 2.2: replacing the ignition burner with a pulverized coal burner, and starting a high-temperature resistant protection system for the pulverized coal burner;step 2.3: mounting a furnace-side burner on a side wall of the gasifier, and starting ahigh-temperature resistant protection system for the furnace-side burner; andstep 2.4: injecting the coal water slurry to be injected and the second pressurized oxygen-containing gas to the gasifier by the furnace-side burner for gasification of the coal water slurry.

6. The method for co-gasification of coal according to claim 5, wherein,in the step 3, the third pressurized oxygen-containing gas and the pressurized carbon dioxide gas carrying pulverized coal are injected into the gasifier by the pulverized coal burner.

7. The method for co-gasification of coal according to claim 5, wherein,a mass flow of the coal water slurry to be injected is greater than or equal to 70% of a load of the furnace-side burner.

8. The method for co-gasification of coal according to claim 5, wherein,in the step 2.4, when gasification of the coal water slurry is performed, a black water circulation system of the gasifier is started.

9. The method for co-gasification of coal according to any one of claims 1 to 8, wherein,the step 3 further comprises the following steps:controlling, by adjusting the oxygen-coal ratio of the third pressurized oxygen-containing gas to the pulverized coal within a range from 0.49 Nm^(3)/kg to 0.65 Nm^(3)/kg and/or by adjusting the oxygen-coal ratio of the second pressurized oxygen-containing gas to the coal water slurry to be injected within a range from 0.54 Nm^(3)/kg to 0.70 Nm^(3)/kg, an operating temperature of the gasifier.

10. The method for co-gasification of coal according to claim 9, wherein,in the gasifier with water wall, the operating temperature of the gasifier is controlled within a range from 1400C to 1600C; andin the firebrick gasifier, the operating temperature of the gasifier is controlled within a range from 1300C to 1400C.

11. The method for co-gasification of coal according to any one of claims 1 to 8, wherein,the step 3 further comprises the following steps:controlling, by increasing or decreasing a volume flow of oxygen in the third pressurized oxygen-containing gas, a mass flow of the pulverized coal, a volume flow of oxygen in the second pressurized oxygen-containing gas and a mass flow of coal in the coal water slurry to be injected in an equal proportion, an operating pressure of the gasifier.

12. The method for co-gasification of coal according to claim 11, wherein,in the gasifier with water wall, the operating pressure of the gasifier is controlled within a range from 4.5 MPa to 7.0 MPa; andin the firebrick gasifier, the operating pressure of the gasifier is controlled within a range from 4.5 MPa to 7.0 MPa.

13. The method for co-gasification of coal according to any one of claims 1, 4, 5 and 6, wherein,in the step 1:by adjusting an injection flow of the fuel and the first pressurized oxygen-containing gas, speed of the temperature rise is controlled to be lower than or equal to 50 C/h.

14. The method for co-gasification of coal according to any one of claims 1, 4, 5 and 6, wherein,the temperature at which the coal water slurry to be injected can be ignited is greater than or equal to 1000C.

15. The method for co-gasification of coal according to claim 6, wherein,in the step 1, the first pressurized oxygen-containing gas and the fuel are injected into the gasifier by isolated passages of the ignition burner; andin the step 3, the third pressurized oxygen-containing gas and the pressurized carbon dioxide gas carrying pulverized coal are injected into the gasifier by isolated passages of the pulverized coal burner.

16. The method for co-gasification of coal according to any one of claims 1, 4, 5 and 6, wherein,the fuel is fuel oil or fuel gas, the first pressurized oxygen-containing gas, the second pressurized oxygen-containing gas and the third pressurizedoxygen-containing gas are all pressurized oxygen;wherein when the fuel is fuel oil, the fuel oil, after being atomized, is injected into the gasifier.


Patent
Enn Coal Gasification Mining Co. | Date: 2015-04-10

A coal co-gasification method, comprising the following steps: 1, fuel and a first pressurised oxygen-containing gas are injected into a gasifier, and the fuel is ignited so as to increase the temperature inside the gasifier; 2, when the temperature increase reaches a temperature capable of igniting powdered coal to be injected, injection of the fuel is stopped, injection of the first pressurised oxygen-containing gas is continued, and a pressurised carbon dioxide gas carrying the powdered coal to be injected is injected into the gasifier so as to perform powdered coal gasification; 3, once the powdered coal gasification has stabilised, coal-water slurry and an oxygen-containing gas are injected into the gasifier to perform co-gasification. The method operates stably, and overcomes cumbersome and time-consuming adjustment steps in the prior art.

Claims which contain your search:

1. A method for co-gasification of coal, comprising the following steps: step 1: injecting fuel and a first pressurized oxygen-containing gas into a gasifier, and igniting the fuel for temperature rise inside the gasifier; step 2: when the temperature rise reaches an extent at which pulverized coal to be injected can be ignited, stopping injecting the fuel, and maintaining injection of the first pressurized oxygen-containing gas; and injecting pressurized carbon dioxide gas carrying the pulverized coal to be injected into the gasifier for gasification of pulverized coal; and step 3: after the gasification of the pulverized coal is stable, injecting coal water slurry and a second pressurized oxygen-containing gas into the gasifier for co-gasification.

2. The method for co-gasification of coal according to claim 1, wherein, in the step 2, an oxygen-coal ratio of the injected first pressurized oxygen-containing gas to the pulverized coal to be injected is within a range from 0.49 Nm^(3)/kg to 0.65 Nm^(3)/kg.

3. The method for co-gasification of coal according to claim 1, wherein, in the step 3, an oxygen-coal ratio of the injected second pressurized oxygen-containing gas to the coal water slurry is within a range from 0.54 Nm^(3)/kg to 0.70 Nm^(3)/kg.

4. The method for co-gasification of coal according to claim 1, wherein, in the step 3: the coal water slurry and the second pressurized oxygen-containing gas are injected by a first burner provided on a side wall of the gasifier; wherein a mass flow of the coal water slurry is greater than or equal to 70% of a load of the first burner.

5. The method for co-gasification of coal according to claim 1, wherein, the step 3 further comprises the following steps: controlling, by adjusting the oxygen-coal ratio of the first pressurized oxygen-containing gas to the pulverized coal to be injected within a range from 0.49 Nm^(3)/kg to 0.65 Nm^(3)/kg and/or adjusting the oxygen-coal ratio of the second pressurized oxygen-containing gas to the coal water slurry within a range from 0.54 Nm^(3)/kg to 0.70 Nm^(3)/kg, an operating temperature of the gasifier.

6. The method for co-gasification of coal according to claim 5, wherein, in the gasifier with water wall, the operating temperature of the gasifier is controlled within a range from 1400 C. to 1600 C.; and in the firebrick gasifier, the operating temperature of the gasifier is controlled within a range from 1300 C. to 1400 C.

7. The method for co-gasification of coal according to claim 1, wherein, the step 3 further comprises the following steps: controlling, by increasing or decreasing a volume flow of oxygen in the first pressurized oxygen-containing gas, a mass flow of the pulverized coal to be injected, a volume flow of oxygen in the second pressurized oxygen-containing gas and a mass flow of coal in the coal water slurry in an equal proportion, an operating pressure of the gasifier.

8. The method for co-gasification of coal according to claim 7, wherein, in the gasifier with water wall, the operating pressure of the gasifier is controlled within a range from 4.5 MPa to 7.0 MPa; and in the firebrick gasifier, the operating pressure of the gasifier is controlled within a range from 4.5 MPa to 7.0 MPa.

9. The method for co-gasification of coal according to claim 1, wherein, in the step 1: by adjusting an injection flow of the fuel and the first pressurized oxygen-containing gas, speed of the temperature rise is controlled to be lower than or equal to 50 C./h.

10. The method for co-gasification of coal according to claim 1, wherein, the temperature at which pulverized coal to be injected can be ignited is greater than or equal to 400 C.

11. The method for co-gasification of coal according to claim 1, wherein, in the step 1, the first pressurized oxygen-containing gas and the fuel are injected into the gasifier respectively by isolated passages of a second burner provided on the top of the gasifier; and in the step 2, the pressurized carbon dioxide gas carrying pulverized coal and the first pressurized oxygen-containing gas are injected into the gasifier respectively by isolated passages of the second burner.

12. The method for co-gasification of coal according to claim 1, wherein, when gasification of the pulverized coal of the step 2 is performed, a black water circulation system of the gasifier is started.

13. The method for co-gasification of coal according to claim 1, wherein, the fuel is fuel oil or fuel gas, and the first pressurized oxygen-containing gas and the second pressurized oxygen-containing gas are both pressurized oxygen; wherein when the fuel is fuel oil, the fuel oil, after being atomized, is injected into the gasifier.

14. The method for co-gasification of coal according to claim 2, wherein, the step 3 further comprises the following steps: controlling, by adjusting the oxygen-coal ratio of the first pressurized oxygen-containing gas to the pulverized coal to be injected within a range from 0.49 Nm^(3)/kg to 0.65 Nm^(3)/kg and/or adjusting the oxygen-coal ratio of the second pressurized oxygen-containing gas to the coal water slurry within a range from 0.54 Nm^(3)/kg to 0.70 Nm^(3)/kg, an operating temperature of the gasifier.

15. The method for co-gasification of coal according to claim 3, wherein, the step 3 further comprises the following steps: controlling, by adjusting the oxygen-coal ratio of the first pressurized oxygen-containing gas to the pulverized coal to be injected within a range from 0.49 Nm^(3)/kg to 0.65 Nm^(3)/kg and/or adjusting the oxygen-coal ratio of the second pressurized oxygen-containing gas to the coal water slurry within a range from 0.54 Nm^(3)/kg to 0.70 Nm^(3)/kg, an operating temperature of the gasifier.

16. The method for co-gasification of coal according to claim 4, wherein, the step 3 further comprises the following steps: controlling, by adjusting the oxygen-coal ratio of the first pressurized oxygen-containing gas to the pulverized coal to be injected within a range from 0.49 Nm^(3)/kg to 0.65 Nm^(3)/kg and/or adjusting the oxygen-coal ratio of the second pressurized oxygen-containing gas to the coal water slurry within a range from 0.54 Nm^(3)/kg to 0.70 Nm^(3)/kg, an operating temperature of the gasifier.

17. The method for co-gasification of coal according to claim 2, wherein, the step 3 further comprises the following steps: controlling, by increasing or decreasing a volume flow of oxygen in the first pressurized oxygen-containing gas, a mass flow of the pulverized coal to be injected, a volume flow of oxygen in the second pressurized oxygen-containing gas and a mass flow of coal in the coal water slurry in an equal proportion, an operating pressure of the gasifier.

18. The method for co-gasification of coal according to claim 3, wherein, the step 3 further comprises the following steps: controlling, by increasing or decreasing a volume flow of oxygen in the first pressurized oxygen-containing gas, a mass flow of the pulverized coal to be injected, a volume flow of oxygen in the second pressurized oxygen-containing gas and a mass flow of coal in the coal water slurry in an equal proportion, an operating pressure of the gasifier.

19. The method for co-gasification of coal according to claim 4, wherein, the step 3 further comprises the following steps: controlling, by increasing or decreasing a volume flow of oxygen in the first pressurized oxygen-containing gas, a mass flow of the pulverized coal to be injected, a volume flow of oxygen in the second pressurized oxygen-containing gas and a mass flow of coal in the coal water slurry in an equal proportion, an operating pressure of the gasifier.


Patent
Enn Coal Gasification Mining Co. | Date: 2015-04-10

A coal co-gasification method, comprising the following steps: 1, fuel and a first pressurised oxygen-containing gas are injected into a gasifier, and the fuel is ignited so as to increase the temperature inside the gasifier; 2, when the temperature increase reaches a temperature capable of igniting coal-water slurry to be injected, injection of the fuel and the first pressurised oxygen-containing gas is stopped, and the coal-water slurry and a second pressurised oxygen-containing gas are injected into the gasifier so as to perform coal-water slurry gasification; 3, once the coal-water slurry gasification has stabilised, a third pressurised oxygen-containing gas and carbon dioxide carrying powdered coal are injected into the gasifier to perform co-gasification. The method operates stably, and overcomes cumbersome and time-consuming adjustment steps in the prior art.

Claims which contain your search:

1. A method for co-gasification of coal, comprising the following steps: step 1: injecting fuel and a first pressurized oxygen-containing gas into a gasifier, and igniting the fuel for temperature rise inside the gasifier; step 2: when the temperature rise reaches an extent at which coal water slurry to be injected can be ignited, stopping injecting the fuel and the first pressurized oxygen-containing gas; and injecting the coal water slurry to be injected and a second pressurized oxygen-containing gas into the gasifier for gasification of the coal water slurry; and step 3: after the gasification of the coal water slurry is stable, injecting a third second pressurized oxygen-containing gas and a pressurized carbon dioxide gas carrying pulverized coal into the gasifier for co-gasification.

2. The method for co-gasification of coal according to claim 1, wherein, in the step 2, an oxygen-coal ratio of the injected second pressurized oxygen-containing gas to the coal water slurry is within a range from 0.54 Nm^(3)/kg to 0.70 Nm^(3)/kg.

3. The method for co-gasification of coal according to claim 1, wherein, in the step 3, an oxygen-coal ratio of the injected third pressurized oxygen-containing gas to the pulverized coal is within a range from 0.49 Nm^(3)/kg to 0.65 Nm^(3)/kg.

4. The method for co-gasification of coal according to claim 1, wherein, the fuel and the first pressurized oxygen-containing gas in the step 1 are injected into the gasifier by an ignition burner provided on the top of the gasifier.

5. The method for co-gasification of coal according to claim 4, wherein, the step 2 further comprises the following steps: step 2.1: when the temperature rise reaches an extent at which the coal water slurry to be injected can be ignited, stopping injecting the fuel and the first pressurized oxygen-containing gas; step 2.2: replacing the ignition burner with a pulverized coal burner, and starting a high-temperature resistant protection system for the pulverized coal burner; step 2.3: mounting a furnace-side burner on a side wall of the gasifier, and starting a high-temperature resistant protection system for the furnace-side burner; and step 2.4: injecting the coal water slurry to be injected and the second pressurized oxygen-containing gas to the gasifier by the furnace-side burner for gasification of the coal water slurry.

6. The method for co-gasification of coal according to claim 5, wherein, in the step 3, the third pressurized oxygen-containing gas and the pressurized carbon dioxide gas carrying pulverized coal are injected into the gasifier by the pulverized coal burner.

7. The method for co-gasification of coal according to claim 5, wherein, a mass flow of the coal water slurry to be injected is greater than or equal to 70% of a load of the furnace-side burner.

8. The method for co-gasification of coal according to claim 5, wherein, in the step 2.4, when gasification of the coal water slurry is performed, a black water circulation system of the gasifier is started.

9. The method for co-gasification of coal according to claim 1, wherein, the step 3 further comprises the following steps: controlling, by adjusting the oxygen-coal ratio of the third pressurized oxygen-containing gas to the pulverized coal within a range from 0.49 Nm^(3)/kg to 0.65 Nm^(3)/kg and/or by adjusting the oxygen-coal ratio of the second pressurized oxygen-containing gas to the coal water slurry to be injected within a range from 0.54 Nm^(3)/kg to 0.70 Nm^(3)/kg, an operating temperature of the gasifier.

10. The method for co-gasification of coal according to claim 9, wherein, in the gasifier with water wall, the operating temperature of the gasifier is controlled within a range from 1400 C. to 1600 C.; and in the firebrick gasifier, the operating temperature of the gasifier is controlled within a range from 1300 C. to 1400 C.

11. The method for co-gasification of coal according to claim 1, wherein, the step 3 further comprises the following steps: controlling, by increasing or decreasing a volume flow of oxygen in the third pressurized oxygen-containing gas, a mass flow of the pulverized coal, a volume flow of oxygen in the second pressurized oxygen-containing gas and a mass flow of coal in the coal water slurry to be injected in an equal proportion, an operating pressure of the gasifier.

12. The method for co-gasification of coal according to claim 11, wherein, in the gasifier with water wall, the operating pressure of the gasifier is controlled within a range from 4.5 MPa to 7.0 MPa; and in the firebrick gasifier, the operating pressure of the gasifier is controlled within a range from 4.5 MPa to 7.0 MPa.

13. The method for co-gasification of coal according to claim 1, wherein, in the step 1: by adjusting an injection flow of the fuel and the first pressurized oxygen-containing gas, speed of the temperature rise is controlled to be lower than or equal to 50 C./h.

14. The method for co-gasification of coal according to claim 1, wherein, the temperature at which the coal water slurry to be injected can be ignited is greater than or equal to 1000 C.

15. The method for co-gasification of coal according to claim 6, wherein, in the step 1, the first pressurized oxygen-containing gas and the fuel are injected into the gasifier by isolated passages of the ignition burner; and in the step 3, the third pressurized oxygen-containing gas and the pressurized carbon dioxide gas carrying pulverized coal are injected into the gasifier by isolated passages of the pulverized coal burner.

16. The method for co-gasification of coal according to claim 1, wherein, the fuel is fuel oil or fuel gas, the first pressurized oxygen-containing gas, the second pressurized oxygen-containing gas and the third pressurized oxygen-containing gas are all pressurized oxygen; wherein when the fuel is fuel oil, the fuel oil, after being atomized, is injected into the gasifier.


A method of treating sour water from industrial processes such as coal gasification. The method includes injecting a polysulfide into a sour water stream to convert cyanide to thiocyanate, thereby reducing the corrosiveness and toxicity of the sour water stream. The method also includes the step of mixing the sour water stream with a reactant to remove CO_(2 )in its various forms in a reaction tank and subsequently routing the stream to a solid settler. The method further includes adjusting the pH of the sour stream in a pH correction tank before sending the sour water stream through a stream stripper for H_(2)S and/or NH_(3 )removal. After passing through the stripper, the treated sour water stream is sent to a biological treatment process for thiocyanate and formate removal. Subsequent treatment steps can be applied, such as multi-grade filters and activated carbon filters, to prepare the treated sour water for reuse.

Claims which contain your search:

1. A method of pre-treating a sour water stream originating from a coal gasification process and containing cyanides and carbon dioxide, comprising the step of injecting a polysulfide into the sour water stream to thereby convert at least some of the cyanides into thiocyanate.

21. The method of claim 20, further comprising the step of routing the treated water stream to a coal gasification or cooling water make-up process for reuse.


The invention relates to a method for producing combustible gas from solid feed materials containing carbon, comprising the following steps: introducing the feed materials into at least one entrained-flow degasification reactor and at least partially degassing the feed materials, a reaction gas and a solid remainder, in particular conversion coke, thus being produced; removing the solid remainders; introducing at least a partial amount of the remainders into a coal gasification reactor and gasifying the solid remainders, a reaction gas and ash or slag being produced; introducing the reaction gases from the coal gasification reactor into the at least one entrained-flow degasification reactor for the final degassing of the feed materials; introducing at least part of the reaction gases from the at least one entrained-flow degasification reactor into a reforming reactor; and cracking the tar fraction of the reaction gas in the reforming reactor in order to obtain a combustible gas.


A sacrificial liner linkage that can be used to automatically shorten a liner for an underground coal gasification process is provided. The sacrificial liner linkage may be one or more sacrificial liner linkage portions that are spaced between one or more liner portions in which the sacrificial liner linkage portions disintegrate before the one or more liner portions to automatically shorten the liner.

Claims which contain your search:

1. An injection well liner for an underground coal gasification process, the injection well liner comprising: a proximal end and a distal end of the injection well liner through which an oxidizing gas is injected for an underground coal gasification process, the oxidizing gas being injected at the proximal end and output at a distal end of the injection well liner, the injection well liner having one or more liner portions and one or more sacrificial liner portions in between the one or more liner portions; and wherein each of the one or more sacrificial liner portions individually disintegrate due to a temperature during the underground coal gasification process so that each sacrificial liner portion and the liner portion connected to a distal end of each sacrificial liner portion falls off and the injection well liner is shortened during the underground coal gasification process.


A method for automatically shortening an injection well liner for underground coal gasification is provided.

Claims which contain your search:

1. A method for shortening an injection well liner during underground coal gasification, the method comprising: providing an apparatus for performing underground coal gasification in a gasification cavity, the apparatus having an injection well with a casing and an injection well liner with an annulus in between through which an oxidizing gas is injected, the injection well liner having one or more liner portions and one or more linkage portions in between the one or more liner portion and each of the one or more linkage portions has one of a different mechanical property and a different physical property than each of the one or more liner portions so that the one or more linkage portions disintegrate before the one or more liner portions during the underground coal gasification process; injecting the oxidizing gas through a proximal end of the injection well and outputting the oxidizing gas only through a distal end of the injection well into a gasification cavity; and repositioning a point of injection of the oxidizing gas into the gasification cavity by disintegrating at least one of the one or more linkage portions of the injection well liner due to one of the different mechanical property and the different physical property of the at least one of the one or more linkage portions being exceeded by a temperature of the underground coal gasification process to shorten the injection well liner so that the oxidizing gas is outputted into the gasification cavity only at a new distal end of the injection well created when the at least one linkage portion disintegrates due to temperature during the underground coal gasification process and the at least one linkage portion and a liner portion connected to the at least one linkage portion falls off the distal end of the injection well.

2. The method of claim 1, wherein repositioning the point of injection further comprises sending oxidizing gas down the annulus of the injection well, drawing a hot zone of the gasification cavity up into the injection well liner and melting at least one of the one or more linkage portions of the injection well liner to shorten the injection well liner.

4. The method of claim 1 further comprising continuing the underground coal gasification process using the shortened injection well liner.

5. The method of claim 4, wherein continuing the underground coal gasification process further comprises sending oxidizing gas inside of the injection well liner to the gasification cavity.

7. The method of claim 1, wherein the property of the underground coal gasification process is temperature and disintegrating at least one of the one or more linkage portions further comprises exceeding a melting temperature of the at least one of the one or more linkage portions.


Patent
Mitsubishi Group | Date: 2015-01-30

Provided is a coal gasifier enabling a reduction in size of a shift reactor by generating hydrogen-rich gasified coal gas. In a coal gasifier (G) generating gasified coal gas by a gasification reaction proceeding in a furnace fed with a gasifiable raw material, such as coal, and a gasifying agent, at least one of water and steam is fed to the furnace as a material accelerating a hydrogen-generating reaction that proceeds simultaneously with the gasification reaction.

Claims which contain your search:

7. A process of generating gasified coal gas by a gasification reaction, said method comprising: feeding a gasifiable raw material including coal, and a gasifying agent, in a coal gasifier that is a two-stage entrained-bed gasifier having a combustion chamber and a reduction chamber, wherein said feeding comprises: feeding, in the combustion chamber, at least one of water and steam as a material accelerating a hydrogen-generating reaction proceeding together with the gasification reaction, as well as the gasifiable raw material and the gasifying agent, from outside of the furnace via a combustion chamber burner; andfeeding, in the reduction chamber, the gasifiable raw material from outside of the furnace via a reduction chamber burner without feeding the gasifying agent, the water, and the steam.

9. The process according to claim 7, further comprising cooling the gasified coal gas by a gas-cooling heat exchanger, and wherein an amount of carbon (C) remaining in unreacted coal passing through the gas-cooling heat exchanger together with the gasified coal gas is set to 30% or more.

10. The process according to claim 9, further comprising introducing the steam to flow in a water cooling wall to cool a periphery of the coal gasifier and/or the gas-cooling heat exchanger.


Higman C.,Higman Consulting GmbH | Tam S.,U.S. Department of Energy
Chemical Reviews | Year: 2014

Theproduction of chemicals from coal via gasification is a large and mature industry. In gasification processes the reactions involving free oxygen are essentially complete. Operating temperature, i.e., whether to apply a slagging or nonslagging operation, is fundamental to the design concept of a gasification system. A typical gasification process comprises a sequence of several unit operations, which can be described in a generalized form. A good understanding of the properties of the feedstock is a prerequisite to the successful design and operation of a gasifier. The ash fusion temperature (AFT), usually characterized by the initial deformation temperature (IDT) as defined by standard test procedures is an important coal characteristic for any gasification process. The alternative to the indirect route from coal to automotive fuels is the direct hydrogenation of coal to liquids (DCL). The coal feedstock is slurried with hydrocarbons and fed to the liquefaction section. The coal reacts under high pressure with hydrogen, the makeup part of which may come from a coal gasification based hydrogen plant.