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Method for gasifying cyclone bed powder coal

A swirling bed and pulverized coal technology, which is applied in the field of swirling bed pulverized coal gasification, can solve the problems of many equipment, low carbon conversion rate and gas calorific value, and is not suitable for coals with high ash content, etc. The effect of large size, simple equipment structure and low manufacturing cost

Inactive Publication Date: 2011-10-26
BEIJING HUAFU ENG
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Problems solved by technology

The equipment and system of wet feeding are simple, but because the water mixed in the pulping process consumes part of the heat, the carbon conversion rate and gas calorific value in coal gasification are lower than those of dry feeding gasifiers, and it is not applicable Coal with a lot of ash; coal preparation, drying, pressurization and conveying systems in dry feed are complicated, with many equipments, and the system operation and equipment maintenance costs are expensive

Method used

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  • Method for gasifying cyclone bed powder coal
  • Method for gasifying cyclone bed powder coal

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specific Embodiment

[0021] Taking the production scale of coal processing capacity of 2t / h as an example, the raw coal is crushed by the crusher (1) into a particle size of ≤1mm, and then dried in the drying preheater (2) to a total moisture content of 8%. After preheating, the temperature 250°C; the dried and preheated coal powder passes through the coal lock hopper (3) and the coal bunker (4) in turn, and is jointly acted by the oxygen from the oxygen generation system (5) and the water vapor from the high-pressure steam boiler (10) The lower part enters the swirling bed gasifier (6) in the upper and lower paths, and gasification reaction is carried out under the conditions of pressure 1.0MPa and temperature 1000°C to prepare coal gas; the produced high-temperature gas is excited in the upper part of the swirling bed gasifier (6). Cold, chilled air comes from the chilled air compressor (8); the chilled gas enters the cyclone dust collector (7) from the top of the swirl bed gasifier (6) for dust ...

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Abstract

The invention discloses a method for gasifying cyclone bed powder coal, which comprises steps as follows: raw coal, of which the particle size is less than or equal to 3mm, is dried and preheated to 200-300 DEG C in a coal drying and preheating system; under the combined action of oxygen / steam mixed gasifying agent, the dried and preheated raw coal enters a cyclone bed gasifier through an upper route and a lower route to carry out gasifying reaction, thereby obtaining gasified coal gas; after being chilled on the top of the cyclone bed gasifier, the gasified coal gas enters a coal gas heat exchanger to be further cooled, and is purified by a coal gas purification system, wherein part of the purified coal gas is used as chilled gas after being compressed by a chilled gas compressor; and after being treated by a high pressure steam boiler, the steam generated by the coal gas heat exchanger is used as a gasified medium together with oxygen generated by an oxygen generation system. By integrating the advantages of the fluidized bed gasifier and the entrained flow gasifier, the invention has the advantages of simple equipment structure, low manufacturing cost and high material treatment capacity, and is easy to operate.

Description

technical field [0001] The invention relates to a pulverized coal gasification method, in particular to a swirling bed pulverized coal gasification method. Background technique [0002] In the 21st century, in order to reduce the pollution of coal to the atmosphere, we must vigorously develop clean coal technology. Coal gasification is one of the most important ways to use coal cleanly and efficiently, and is the most important unit technology for the development of modern coal chemical industry. Coal gasification can produce fuel gas, chemical synthesis raw material gas, hydrogen fuel cell, coal gas combined cycle power generation, synthetic natural gas, etc. [0003] The existing coal gasification technology is divided into fixed bed gasification technology, fluidized bed gasification technology and entrained bed gasification technology according to the structural characteristics of the coal gasification furnace and the movement mode of the fuel during conversion in the g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/54C10J3/84C10J3/72
CPCC10J3/487C10J3/78C10J2300/0906C10J2300/0909C10J2300/0933C10J2300/0936
Inventor 吴道洪王其成
Owner BEIJING HUAFU ENG
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