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Coal powder pyrolysis and gasification method

A pulverized coal, pyrolysis technology, applied in the field of coal gasification

Inactive Publication Date: 2014-08-13
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, currently commercialized entrained-bed coal gasifiers that use chemical heat to recover sensible heat from high-temperature syngas only inject part of coal-water slurry or pulverized coal into the second stage, and there is still room for further improvement in energy conversion efficiency.

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  • Coal powder pyrolysis and gasification method

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Embodiment 1

[0042] For the production of syngas by the gasification technology of entrained bed pulverized coal pyrolysis and semi-coke gasification, the sensible heat in the high-temperature gasification syngas of semi-coke is recovered by means of pulverized coal pyrolysis, and the syngas CH 4 The content is high, the cold gas efficiency of the system is high, and it can be widely used in the preparation of methane-rich synthesis gas or fuel gas with high calorific value. Table 1 shows the properties of raw coal. The pressure of the gasifier is 4.0MPa, and the processing capacity of a single gasifier is greater than 1000 tons (dry basis coal) per day.

[0043] Table 1 Properties of raw coal

[0044]

[0045] In this embodiment, the gasifier consists of two stages: an entrained bed pulverized coal pyrolysis furnace and an entrained bed semi-coke gasifier. All pulverized coal passes through N 2 Conveying into the entrained bed pulverized coal pyrolysis furnace, the synthetic gas cir...

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Abstract

The invention discloses a coal powder pyrolysis and gasification method. Entrained flow bed coal powder pyrolysis and entrained flow bed semicoke gasification are integrated to recover synthetic gas sensible heat of semicoke high-temperature gasification. All of the coal powder enters the entrained flow bed coal powder pyrolyzing furnace, tar generated by coal powder pyrolysis is further pyrolyzed at high temperature to generate low-molecular hydrocarbons (such as methane) and coke; the semicoke generated by coal powder pyrolysis enters the entrained flow bed gasification furnace to generate high-temperature synthetic gas. The synthetic gas generated by the method contains rich methane (the methane content is 2-15v%) and low tar content (less than 10 ppm); and the device has the advantages of high cooled coal gas efficiency (greater than 80%) and wide raw material adaptability, and is applicable to the fields of preparation of natural gas and combustible gas from coal and the like.

Description

technical field [0001] The invention relates to a coal gasification method, in particular to a method for efficiently preparing methane-rich synthesis gas or fuel gas by coupling entrained bed pulverized coal pyrolysis and entrained bed semi-coke gasification. technical background [0002] Coal accounts for two-thirds of the primary energy consumed in my country, and for a long time to come, coal will still play the leading role in energy supply. Coal chemical industry uses coal as raw material, and converts coal into gaseous fuel, liquid fuel, coke and chemicals through chemical processing, including gasification, coking, liquefaction and other utilization routes of coal. [0003] Coal pyrolysis is a very complicated process, and chemical reactions can be generally divided into two categories: cracking and polycondensation. Coal pyrolysis is an extremely important intermediate process of coal processing and conversion, such as combustion, gasification, coking, liquefaction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/60C10J3/46
CPCY02P20/129
Inventor 代正华李超龚欣于广锁王辅臣刘海峰王亦飞周志杰陈雪莉梁钦锋郭晓镭李伟锋许建良郭庆华王兴军陆海峰赵辉龚岩
Owner EAST CHINA UNIV OF SCI & TECH
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