Coal pyrolysis gasification polygeneration device and process based on circulating fluidized bed

Abstract

The invention discloses a coal pyrolysis gasification poly-generation device and process based on a circulating fluidized bed. A circulating fluidized bed boiler is organically coupled with a moving bed coal pyrolysis reactor and a moving bed gasification furnace, the high temperature circulation ash of the circulating fluidized bed boiler is used as a carrier for pyrolyzing high volatile coal steam coal from a coal funnel in the moving bed coal pyrolysis reactor, the semicoke generated in pyrolysis is separated out from the pyrolysis reactor and is fed into the moving bed gasification furnace for gasification, and at the same time the moving bed gasification furnace is used as a device for purifying a pyrolysis coal gas, thereby achieving the function of on-line dust collection of the pyrolysis coal gas. The gasified activated coke as a byproduct is discharged outside the reaction system. Therefore, through organic combination of three procedures, including pyrolysis, gasification and combustion, graded optimized utilization of the coal resource is achieved, joint production of heat, electricity, tar, coal gas and activated coke is achieved, and meanwhile the purposes of gasifying the coal gas and efficiently purifying the pyrolysis coal gas are achieved.

Description

technical field [0001] The invention relates to a pyrolysis, gasification and combustion combined coal graded utilization device and process, in particular to a device and process capable of realizing combined production of heat, electricity, tar, coal gas and active coke. Background technique [0002] my country is rich in coal resources. In 2012, my country's coal output reached 3.6 billion tons, of which about 80% was used for direct combustion. Direct combustion of coal has problems such as low combustion efficiency and serious pollution. Therefore, it is imminent to develop new technologies for efficient comprehensive utilization of coal and low pollution emissions. Starting from the reactivity of coal, multiple production processes using coal as raw materials are organically coupled to achieve graded transformation and utilization, which can better solve resource and environmental problems. [0003] Based on circulating fluidized bed combustion, the high-temperature c...

AI Technical Summary

Problems solved by technology

However, in the actual process, due to the small particle size of the circulating ash, there are problems such as high dust content in the pyrolysis gas, which is easy to cause pipeline blockage and difficult to use dusty tar, and purification treatment is difficult, which has always been an urgent problem in the industry.

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