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Patent
Tianhua Institute of Chemical Machinery and Automation | Date: 2017-03-29

The present invention relates to a method for drying high moisture, low calorific value lignite for a generating set and recovering water contained therein and an apparatus thereof, which mainly consisting of a rotary steam tube dryer, a washing cooling tower, a coal mill, a 1st bag filter I, a condenser, a weighing surge bunker, a water ring vacuum pump and so on. In the present invention, a drying system is integrated with a milling system, every dryer and the corresponding coal mill are disposed and are directly connected via a surge bunker, thereby not only saving the heat lost during the transportation of pulverized coal, but also omitting a long-distance transportation from a conventional drying system to a conventional milling system, effectively avoiding such phenomena as dust pollution, waste and spontaneous combustion during transportation and transshipment, simplifying the coal preparation system employed in the front-end process of drying.


Patent
Tianhua Institute of Chemical Machinery and Automation | Date: 2017-03-29

The present invention relates to a method for processing acetic acid solvent in an oxidising unit of a PTA industrial apparatus; said method uses a pressure filter machine to filter crude terephthalic acid slurry, and then, using a multi-stage counter-current method, uses washing water to wash the acetic acid solvent, and, by means of setting up a bias-current and drainage, prevents residual liquid in the filtrate pipe from entering the next area following the rotation of the pressure filter machine, improving washing efficiency and reducing the amount of washing water; the present invention integrates the processes of filtering and washing crude terephthalic acid into a single pressure filter machine, such that the process is shorter, the occupied floor space is reduced, and energy consumption is lower. A method feeding nitrogen gas into the mother liquor tank and washing liquid tank is used to regulate the pressure balance of the system.


Patent
Tianhua Institute of Chemical Machinery and Automation | Date: 2017-03-01

The present invention relates to a solvent exchanger and a method for improving the exchange efficiency of a CTA solvent. The method comprises the following steps: (1) pressurizing a CTA slurry into a solvent exchanger for separation and respectively obtaining a mother liquor, a bias flow mother liquor and a suspended matter A; (2) washing the suspended matter A to respectively obtain a primary filtrate, a bias flow primary filtrate and a suspended matter B; (3) washing the suspended matter B to respectively obtain a secondary filtrate, a bias flow secondary filtrate and a suspended matter C respectively; (4) washing the suspended matter C to respectively obtain a tertiary filtrate, a bias flow tertiary filtrate and a suspended matter D; (5) washing the suspended matter D to respectively obtain a fourth filtrate, a bias flow fourth filtrate and a suspended matter E; (6) washing the suspended matter E to respectively obtain a fifth filtrate, a bias flow fifth filtrate and a filter cake, wherein the bias flow fifth filtrate is guided to a bias flow filtrate tank by a suction machine unit ; and (7) after the washing is finished, back-flushing the filter cake and then pulping to obtain a slurry, and discharging. By means of improvements in both the technological process and the equipment structure, the invention greatly reduces the energy consumption and improves the solvent exchange efficiency.


Patent
Tianhua Institute of Chemical Machinery and Automation | Date: 2013-06-25

A dehumidifying tower having a washing section, a flash-distilling section, and a condensing section. In the washing section, exhaust gas is washed with a cooling liquid to remove at least a portion of solid dust entrained in the exhaust gas, cool the exhaust gas, and condense at least a portion of moisture in the exhaust gas into liquid. The flash-distilling section flash-distills the cooling liquid used in the washing section to produce a cooled cooling liquid and a cooling liquid vapor. Cooling liquid produced by flash-distillation enters the washing section. The flash-distilling section is in gas-phase isolation from the washing section. The condensing section condenses the cooling liquid vapor produced by flash-distillation. The condensing section is configured to be in gas-phase communication with and liquid-phase isolation from the flash-distilling section, and be in both gas-phase and liquid-phase isolation from the washing section.


Patent
Tianhua Institute of Chemical Machinery, Automation and Lanzhou Ruide Drying Technology Co. | Date: 2011-01-10

The present invention relates to A drying process for drying lignite by swashing dust collection and washing, comprising steps of: conveying wet powdered coal into a dryer by a feed belt so as to be dried; introducing hot steam for drying via a rotary joint at an outlet end of the dryer and into a heat exchange tube via a steam chamber; having the wet powdered coal contact and heat exchange with a steam pipe and dried; discharging the dried coal from an discharge port and conveying the dried coal to a subsequent station by a discharging belt; introducing condensed water resulted from steam heat exchange into a condensate pot via a rotating joint and then conveying the condensed water to a next station via a condensate pump; performing a primary dust collecting in a bin at a tail end of the dryer on waste gas produced during the drying process, discharging the waste gas from a top end of the bin and the introducing the waste gas into a swashing dust collector; discharging waste liquid resulted from washing the waste gas from a bottom of the swashing dust collector, conveying the waste liquid discharged from the swashing dust collector via a waste liquid pump. In the present invention, lignite is dried with steam latent heat, and the dried waste gas is washed by a gravity settlement and swashing dust collection so as to assure that the waste gas is discharged after reaching a standard value and avoid the risk of taking fire and explosion occurred in a dry-type dust collecting way.


Patent
Tianhua Institute of Chemical Machinery and Automation | Date: 2013-03-13

A method is provided for purifying and recycling water vapor from a coal drying process and device which employ temperature reduction and dehumidifying, a flash distillation, and vacuum condensation. With a condensed tower, a high humidity exhaust gas is preliminarily lowered in temperature, and condensed water of 560 C. is pumped, are received, vapor-liquid reverse contact is performed, and temperature reduction and dehumidifying occurs. With a flash distillation tank and a demisting washer, condensed water of 40100 C. pumped by the flash distillation water pump is performed on vacuum flash distillation, water vapor of 560 C. evaporated in the flash distillation tank enters into the demisting washer to be dehumidified and then into a vapor condenser. With a condenser and a water ring vacuum pump, water vapor of 560 C. is condensed through mist eliminating and washing by the demisting washer, condensed water is recycled, and non-condensable gas is discharged.


Patent
Tianhua Institute of Chemical Machinery and Automation | Date: 2013-12-16

A method and device are provided for purifying and recycling water vapor from a coal drying process. Included are a temperature-lowering and dehumidifying process, a flash distillation stripping process, and a vacuum condensing process. A condensing tower receives a temperature-lowered exhaust gas with high humidity from a cooling tube and a condensed water of 560 C. from a flash distillation tank, allowing the exhaust gas and the condensed water to contact each other in a vapor-liquid reverse manner, to lower the temperature and dehumidify the exhaust gas. The flash distillation tank performs a vacuum flash distillation to the condensing water pumped therein from the condensing tower. Water vapor of 560 C. evaporated through flash distillation in the flash distillation tank enters into the demisting washer to be dehumidified and then is condensed. The condensed water in the vapor condenser is transferred into a recycled water tank. Non-condensable gas is discharged out.


Patent
Tianhua Institute of Chemical Machinery and Automation | Date: 2013-05-15

A device for recovering SiCl_(4 )slurry and method for the same, comprising a paddle dryer for receiving SiCl4 slurry containing chlorosilane; a first spray scrubber for receiving exhaust gas from the paddle dryer; a condenser for condensing and recovering the purifying exhaust gas from the first spray scrubber and discharging supersaturated vapor that after condensation and separation; a defogging separator for removing liquid droplets from supersaturated vapor which is cooled by the condenser; a hydrolysis tank for receiving and hydrolyzing a paste-like slurry from the paddle dryer and vapor from the defogging separator to produce mixture and exhaust gas; a drum pressure filter for receiving neutralization products from a neutralization stirring tank.


Yang Q.,Lanzhou University of Technology | Bao G.,Lanzhou University of Technology | Zhang H.,Tianhua Institute of Chemical Machinery and Automation
International Journal of Control and Automation | Year: 2014

Auto-disturbance-rejection control (ADRC) technology is nonlinear robust control technology. Its nonlinear feedback relies on the size and direction of the error between desired and the actual trajectory. When the controlled object is disturbed by uncertain factor or its parameters change, ADRC can transform nonlinear system into an integral series structure of linear system by using nonlinear transformation, what can realize feedback linearization of dynamic system and improve system's control performance. According to above, we propose to apply ADRC technology to brushless DC motor control system to restrain torque ripple and improve system's disturbance-rejection in this paper. After theoretical analysis the feasibility of this method, we made a simulation. Simulation results show that the effects of torque ripple suppression and anti disturbance ability of the system have been improved. © 2014 SERSC.


Patent
Tianhua Institute of Chemical Machinery and Automation | Date: 2013-09-04

The invention relates to an exhaust gas separating tower, comprising a washing section, a flash-distilling section above the washing section, and a liquid seal means between the flash flash-distilling section and the washing section. The washing section is configured for washing exhaust gas entering the tower with a cooling liquid to at least partially remove solid dust entrained in the exhaust gas, cool the exhaust gas, and condense at least a portion of moisture in the exhaust gas into liquid. The flash-distilling section is configured for flash-distilling the cooling liquid from the washing section to produce a cooled cooling liquid and a cooling liquid vapor. The liquid seal means is configured so that the cooling liquid produced by flash-distillation can enter the washing section through the liquid seal means while the flash-distilling section is in gas-phase isolation from the washing section, wherein a pressure in the flash-distilling section is lower than that in the washing section.

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