Fine coal gasification method with fly ash compulsory recycling system

Abstract

The invention relates to a fine coal gasification method with a fly ash compulsory recycling system, which is characterized in that coal gas produced by the fine coal gasification reaction carries fly ash particles; gas and fly ash particles in the coal gas carrying with the fly ash particles can be separated through a cyclone separator; and the separated fly ash particles enter the lower part of a gas distribution plate (8) of a gasifer to conduct further burning and gasification reaction. According to the method provided by the invention, a gas ejector (7) is mounted between a vertical tremie pipe of a fine coal fluidized bed coke powder circulating system and the gasifer, and the recovered fly ash particles pass the lower part of the gas distribution plate, and then directly enter a high-temperature oxidation zone in the center area of the gasifier by the gas ejector to conduct further burning and gasification reaction, so that the carbon conversion efficiency of the fine coal is improved, and the carbon conversion efficiency of wood coal and bituminous coal can achieve above 98 percent. Even though for the 'three high one low' poor coal, namely the coal with high sulfur, high ashy, high ash fusion temperature and low reactivity, the conversion rate of one way coal can also achieve above 92 percent.

Description

technical field [0001] The invention relates to a pulverized coal gasification method, in particular to a pulverized coal gasification method with a fly ash forced reinjection system. Background technique [0002] The development and industrialization of pulverized coal fluidized bed gasification method has a history of more than 80 years, especially in the past 30 years, various ash fusion gasifiers have appeared, including the ash agglomeration gasifier U-GAS in the United States, The ash fusion gasification furnace ICC in Shanxi, China, or the ash cohesion gasification furnace in Shaanxi, have a common feature in that there is a central jet tube for introducing oxygen in the middle and lower part of the gasifier, so the fluidized bed The middle and lower part of the phase zone forms a so-called high temperature oxidation zone. At the same time, two or three cyclone separators in series are installed at the outlet of the gasifier, the purpose is to capture the coal coke p...

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Problems solved by technology

[0004] The present invention aims to provide a belt with high conversion rate of pulverized coal and economical operation of the gasifier, aiming at the disadvantages of low pulverized coal conversion rate and uneconomical operation of the gasifier in the existing pulverized coal gasification method. Pulverized Coal Gasification Method with Fly Ash Forced Reinjection System

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