ENN Coal Gasification Mining Co.

China

ENN Coal Gasification Mining Co.

China
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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.


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.


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.


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.


Patent
Enn Coal Gasification Mining Co. | Date: 2016-09-07

Disclosed is a nozzle comprising a housing (1), the housing comprising a first portion (8) and a second portion (9), the first portion (8) and the second portion (9) being in fluid communication via a front hole (10), and a side hole (6) being provided on a side wall of the second portion (9). The nozzle further comprises a sealing assembly (3) able to open and close the front hole (10) and the side hole (6) in a sliding manner in the housing, and a spring (2) provided between the housing and the sealing assembly. Furthermore, an underground coal gasification method using the nozzle is disclosed, which comprises the steps of adjusting the injection flow rate and injection pressure of a gasification agent and the pressure of a gas output channel port, and controlling the opening and closing of the front hole (10) and the side hole (6). The nozzle can optionally alternately or simultaneously open the front hole and the side hole without any manual operation. In the underground coal gasification process, opening the front hole of the nozzle can guide the movement of a gasification working face, opening the side hole can intensify gasification of a coal seam at two sides of a gasification channel, making the two sides of the gasification channel expand more uniformly, increasing the rate of recovery of coal resources. (Fig. 1)


A gas injection apparatus with a controllable gas injection point, a gas injection process, and a gasification method. The gas injection apparatus comprises a directional well channel (6), where a continuous oil pipe (3) is provided in the directional well channel (6). The continuous oil pipe (3) is connected to an oxygen/oxygen-rich gas pipeline. An annular gap between the continuous oil pipe (3) and the directional well channel (6) is connected to an auxiliary gasification agent pipeline and a vapor pipeline. A gas injection wellhead (2) is provided at the start end of the continuous oil pipe (3), and a nozzle (4) is provided at the tail end. In the present invention, based on directional drilling and continuous oil pipe technologies, the movement of a gas injection point is implemented by using a manner of combining directional drilling and a continuous oil pipe; meanwhile, by using a principle of controlling reverse combustion by adjusting a gasification agent injection parameter, the movement of a working surface position and a combustion speed of a flame are regulated, so as to achieve the objective of ignition and gasification for reverse combustion of an underground coal layer.


Provided is a method for fracture communication, passage processing and underground gasification of an underground carbon-containing organic mineral reservoir, where a mixture of CO_(2) and O_(2) is used as a medium for a fracture communication step, a passage processing step and/or a gasification step. The method uses the mixture of CO_(2) and O_(2) to extract and utilize the energy in the underground carbon-containing organic mineral reservoir, greatly increases energy utilization efficiency compared with conventional utilization schemes, and, compared with conventional underground gasification technologies, increases the calorific value of a combustible gas, increases and adjusts effective gas compositions, suppresses CO_(2) generation and reduces raw material gas production costs, while at the same time implements the capturing of CO_(2) and utilization of the same as a resource.


Patent
Enn Coal Gasification Mining Co. | Date: 2015-07-29

Provided is a method for joint-mining of coalbed gas and coal. The method comprises: a well-drilling step; a fracturing and penetration step; a coalbed gas extraction step; an ignition step; and, an underground gasification step. The method combines an underground coal gasification technology and a coalbed gas extraction technology, not only allows for utilization of the high temperature of underground gasification to heat a coalbed, thus increasing the permeability of a coal seam and increasing the recovery rate of the coalbed gas, but also allows for utilization of the coalbed gas to perform the drilling and fracturing and penetration processes, thus increasing the efficiency of underground coal gasification.


Patent
Enn Coal Gasification Mining Co. | Date: 2016-07-13

An underground coal gasification furnace comprises an ignition system and a gas injection system. The ignition system is provided with a first vertical drilling well (1) and a first horizontal directional drilling well (a) in communication with the first vertical drilling well. The gas injection system is provided with a second drilling well introduced into a coal seam. At least one second horizontal directional drilling wells (b, c, d, e, f) of a horizontal section in the coal seam serves as the second drilling well. Also provided is an underground coal gasification method. The method comprises: enabling a flaming fire region of a first horizontal directional drilling well (a) to withdraw in a second horizontal directional drilling well (b, c, d, e, f) until withdraw to near a coal feeding point. The underground coal gasification furnace eliminates the defects of low cut-through speed and unstable structure in a gasification production stage in the prior art. (Fig. 3)


Patent
Enn Coal Gasification Mining Co. | Date: 2016-11-02

An underground gasification ignition method comprises the following steps: making a directional drilling and a vertical well to construct an underground gasification furnace; using a cold fracturing method to pre-penetrate a coal seam; and igniting in the vertical well at an end of the directional drilling.

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