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Recycling system and method for gas waste heat of coal water slurry gasification

A technology for gasification of coal gas and waste heat recovery, which is applied in gasification process, granular/powdered fuel gasification, chemical industry, etc., and can solve the problems of low recovery and utilization rate of waste heat from coal-water slurry gasification, environmental protection, and non-energy saving. , to achieve the effect of improving cold gas efficiency, easy operation, and increasing effective gas content

Inactive Publication Date: 2016-07-20
SHENWU TECH GRP CO LTD
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Problems solved by technology

[0007] Aiming at the problem that the existing technology is not energy-saving and environmentally friendly, the first purpose of the present invention is to provide an energy-saving, safe and environment-friendly coal water slurry gasification gas waste heat recovery and utilization system
[0008] Aiming at the low recovery and utilization rate of waste heat from coal-water slurry gasification, the second object of the present invention is to provide a method for recovery and utilization of waste heat from coal-water slurry gasification gas that can increase the effective gas content and improve the efficiency of cold gas

Method used

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  • Recycling system and method for gas waste heat of coal water slurry gasification

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Embodiment

[0037] The high-temperature gas produced by the coal-water slurry gasifier enters the fluidized bed gasifier at 1300 ° C, and the gas contains about 15% CO 2 and 10% H 2 O, H in the gas under the condition of high temperature waste heat of the gas 2 O and CO 2 Carry out C+CO 2 =2CO; C+H 2 O=CO+H 2 reaction. Syngas limited components CO, H 2 content increased by 5%. After passing through the fluidized bed gasification device 4, the temperature of the gas is reduced to 950°C, and the gas passes through the gas heat exchanger to preheat the nitrogen, and the temperature of the gas is further reduced to 600°C. The gas preheated by the gas preheats the nitrogen to 550°C, and the nitrogen is sent into the fluidized bed pyrolyzer as the heat carrier of the long-flame coal pyrolysis. The oil-gas mixture produced by pyrolysis is sent to the oil-gas condensing device for condensation to obtain additional products such as oil and gas. The pyrolyzed semi-coke enters the semi-coke...

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Abstract

The invention provides a recycling system for gas waste heat of coal water slurry gasification and a recycling method for the gas waste heat of the coal water slurry gasification by using the system. The recycling system comprises a coal water slurry gasifier (3), a fluidized bed gasification device (4), a gas heat exchanger (5) and a fluidized bed pyrolyzer (6); the gas outlet of the coal water slurry gasifier (3) is communicated with the gas inlet of the fluidized bed gasification device (4); the gas outlet of the fluidized bed gasification device (4) is communicated with the gas inlet of the gas heat exchanger (5); the nitrogen outlet of the gas heat exchanger (5) is communicated with the gas inlet of the fluidized bed pyrolyzer (6). The gas waste heat recycling and purifying process, based on fluidized bed gasification, provided by the invention combines the technical advantages of the fluidized bed gasification, and is simple in integrated system equipment, easy to operate, high in thermal efficiency and free of pollution.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a system and method for recovering and utilizing waste heat of coal water slurry gasification coal gas. Background technique [0002] Coal-water slurry entrained bed gasification, the raw coal is made into coal-water slurry, and under the action of the gasification agent, the two come into contact with each other in parallel, and the coal material reacts with the gasification agent at a temperature higher than its ash melting point. and gasification reaction. Compared with fixed bed gasification and fluidized bed gasification, entrained bed gasification has higher reaction temperature, faster reaction rate, shorter residence time of coal material, and the product does not contain tar, methane and other substances. The main characteristics of coal water slurry gasification are high gasification temperature, high strength, relatively strong adaptability to co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/66C10J3/56C10J3/48C10J3/62C10J3/72
CPCC10J3/48C10J3/56C10J3/62C10J3/66C10J3/721C10J2300/0906C10J2300/093Y02P20/10Y02P20/129
Inventor 孙宝林裴培吴道洪
Owner SHENWU TECH GRP CO LTD
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