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Gasification method for classification conversion of hydrocarbon components of coal

A technology of coal gasification and hydrocarbons, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve the problems of coal type limitation, high equipment investment cost, low gasification efficiency, etc., to reduce irreversibility and reduce equipment Effect of investment and gasification efficiency increase

Active Publication Date: 2013-04-24
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0007] To sum up, the application and popularization of the coal gasification process still has obstacl

Method used

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  • Gasification method for classification conversion of hydrocarbon components of coal
  • Gasification method for classification conversion of hydrocarbon components of coal
  • Gasification method for classification conversion of hydrocarbon components of coal

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Example

[0040] Comparative example:

[0041] according to figure 2 As shown in the process flow of the hierarchical gasification of hydrocarbon components of coal supplied by external combustion, the operating conditions of the combustion unit 1 are: the pressure in the furnace is slightly positive, and the flue gas temperature is 1400-1700°C, according to the heat exchange cycle Moderate adjustment. In the new system, the exhaust gas temperature is 165℃. The carbonization unit refers to the actual test data of the coke oven (Table 3). The coking heat consumption per ton of coke produced is 3240MJ / t. Taking the temperature of the carbon monoxide production unit as 900°C, the carbon conversion rate is 0.95, and the heat exchange loss during the carbonization process and the carbon monoxide production unit process are both 5%.

[0042] Table 1 shows the heat balance sheet of the coal carbonization unit. The coal carbonization unit in the new gasification can reduce fuel input by about 5%...

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Abstract

The invention discloses a gasification method for classification conversion of hydrocarbon components of coal. The method is based on the principle of 'proper components and classification conversion' of fuel; coal gasification is accomplished through three steps including carbonization, production of carbon monoxide, and transformation to produce hydrogen; firstly, coal is carbonized to be purified so as to obtain crude coke, then the crude coke reacts with carbon dioxide to produce carbon monoxide, and finally, hydrogen and carbon dioxide are produced through transformation reaction, and carbon dioxide is supplied to a coke carbon monoxide unit; composite coal gas with different carbon-hydrogen ratios can be obtained by mixing hydrogen, carbon monoxide and coke oven gas; and heat required during the carbonization process of coal and the generating process of carbon monoxide is supplied by coal burning. According to the invention, the gasification process of coal is accomplished through three steps including coking, gasification and transformation to produce hydrogen, so that the irreversibility of the whole gasification reaction can be lowered, and the gasification efficiency of coal is improved remarkably; a space division device and a waste heat boiler are removed, so that the equipment investment is reduced; and fuels include gasification coal and heat supply coal, so that the adaptability of coal can be improved greatly.

Description

technical field [0001] The invention belongs to the field of energy, power and coal chemical industry, and in particular relates to a gasification method for staged transformation of hydrocarbon components of coal supplied by external combustion for heating. Background technique [0002] Due to the differences in the quality of coal and gas fuels and their energy conversion and utilization methods, the power generation efficiency of coal-fired power plants is 10-15 percentage points lower than that of natural gas combined cycle power plants. At present, in order to realize the efficient and clean utilization of coal, whether it is the chemical production process or the IGCC power generation system, the coal must be gasified first to create the necessary conditions for the efficient utilization of coal. [0003] The coal gasification process uses coal or coal char as raw material, oxygen (air, oxygen-enriched or industrial pure oxygen), carbon dioxide, water vapor, etc. The ...

Claims

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Application Information

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IPC IPC(8): C10J3/60C10J3/66C10J3/00C10J3/72C01B3/02C01B3/12
CPCY02E20/18Y02P20/129
Inventor 金红光张筱松
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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