Process method for preparing fuel gas from coal

A process method and gas technology, which can be used in the manufacture of combustible gas, granular/powder fuel gasification, petroleum industry, etc., can solve the problems of poor coal adaptability, inflexible operation, and poor economy, and achieve low steam consumption and operation. Simple, flexible and environmentally friendly

Inactive Publication Date: 2018-12-11
EAST CHINA UNIV OF SCI & TECH +1
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Problems solved by technology

[0005] The present invention aims to solve the problems of poor adaptability of coal type, poor environmental protection, low efficiency, inflexible operation, and poor economy existing in the existing coal-to-gas process, and provides a low-cost, high-efficiency coal-to-gas device with the advantages of Industrial gas preparation method with good environmental performance and high operating flexibility

Method used

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  • Process method for preparing fuel gas from coal

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Embodiment 1

[0032] Such as figure 1 As shown, in this embodiment, the coal-to-gas system includes a pulverized coal gasification unit, a chilling unit, a heat recovery unit, an ash removal unit, a circulating gas pressurization unit, a steam drum unit, a gas preheating unit and a cooling unit.

[0033] Pulverized coal from the pulverized coal conveying device, oxidant and gasification agent from public works enter the pulverized coal gasification unit to produce gas; the gas outlet temperature of the pulverized coal gasification unit is 900-1200 °C, and the temperature of the slag outlet is 100 °C higher than the melting point of coal ash; About 40-75% of the ash is discharged from the slag outlet in a molten state, and about 25-60% of the ash enters the chilling unit in the form of fly ash along with the gas; the pulverized coal gasification pressure is normal pressure to 0.5MPa. The gasification unit adopts an entrained bed gasifier and a water wall refractory lining.

[0034] The quen...

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Abstract

The invention relates to a process method for preparing fuel gas from coal. A device for preparing fuel gas from coal used in the method comprises a powdered coal gasification unit, a quenching unit,a heat recovery unit, an ash removing unit, a circulation gas pressurization unit, a steam bag unit, a fuel gas preheating unit and a cooling unit. The process method for preparing fuel gas from coalhas the advantages of high gasification temperature and high coal type applicability; the local cheap coal types can be used as raw materials for greatly reducing the gas preparation cost; the environmental-friendly performance is good; no organic waste water is generated; the fly ash content in the coal gas is low; the fuel gas pressure is from normal pressure to 0.5MPa; the heat value is 900 to2500 kcalNm<3>; the method meets the requirement of low-heat-value fuel gas need in industries of aluminum oxide, ceramics, glass and the like.

Description

technical field [0001] The invention relates to a process method of coal gasification, in particular to an entrained bed coal gasification process method. Background technique [0002] Industries such as alumina, ceramics, and glass consume large amounts of clean, low-cost fuels. Fuel cost and supply has become an important factor affecting the economic benefits of enterprises. Due to the high price of natural gas, it is difficult for such enterprises to bear the high cost, especially for enterprises with low-end products; natural gas is mainly used for civilian use, and the stable supply to industrial enterprises cannot be guaranteed, so it is difficult for such enterprises to use it on a large scale. Existing enterprises that need a large amount of fuel often use coal gasification furnaces such as self-built fixed beds (including second-stage furnaces) and fluidized beds to produce fuel gas. Due to the generation of sewage containing organic matter in the process of coal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/48C10J3/52C10J3/72C10J3/74C10J3/86
Inventor 代正华刘海峰郭晓镭梁钦锋许建良于广锁龚欣王辅臣王亦飞陈雪莉郭庆华李伟锋王兴军赵辉陆海峰龚岩刘霞沈军杰王立赵丽丽
Owner EAST CHINA UNIV OF SCI & TECH
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