Fluidized bed pulverized coal gasification device and technology with zero emission of fly ash

Abstract

The invention discloses a fluidized bed pulverized coal gasification device and technology with zero emission of fly ash. The fluidized bed pulverized coal gasification device includes a gasificationsystem consisting of a gasifier, a high temperature cyclone separator, a waste heat boiler, a high efficiency cyclone separator and a dust collector, and a material return system consisting of a one spin dipleg, a one spin loop seal, a two spin dipleg, a two spin loop seal, a high efficiency cyclone dipleg, a high efficiency cyclone loop seal, a dust collector dipleg and a dust collector loop seal, a primary ejector, a secondary ejector, a tertiary ejector and a material return pipe. The cooperative usage of the gasification system and the material return system of the fluidized bed pulverizedcoal gasification device can directly and completely return coarse fly ash and fine fly ash captured by a gas-solid separator under high pressure to a high temperature central jet zone of the gasifier and maintain temperature and pressure in the original gasifier unchanged, thereby achieving the zero emission of the fly ash and maximizing the effect of ash agglomeration in the gasifier. And meanwhile the fluidized bed pulverized coal gasification device and technology with the zero emission of the fly ash optimize the production environment and are a coal gasification technology with high gasification efficiency, long-term stable operation and environmental friendliness.

Description

technical field [0001] The invention relates to the technical field of pulverized coal gasification, in particular to a fluidized bed pulverized coal gasification device and process with zero discharge of fly ash. Background technique [0002] my country is a country rich in coal, short of oil and little in gas. This energy structure background determines that coal will remain the mainstay of my country's energy and an important pillar of my country's economic development for a long time to come. Among the various utilization methods of coal, the coal gasification process is the process of converting solid raw coal, which is difficult to process and remove useless components, into a gas that is easy to purify and apply. Up to now, people have developed a variety of reactors, including fixed-bed, fluidized-bed and entrained-bed reactors to achieve the purpose of coal gasification to produce fuel gas and synthesis gas. Among these reactors, the fluidized bed coal gasificatio...

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Problems solved by technology

[0008] The present invention aims at the problems of incomplete return of fly ash and high failure rate of gasification furnace related equipment existing in the existing pulverized coal gasification method

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