Solid fuel pyrolysis, gasification, combustion and staged conversion device and method for multi-layer fluidized bed

Abstract

The invention discloses a solid fuel pyrolysis, gasification, combustion and staged conversion device and method for a multi-layer fluidized bed.According to the device and method, pyrolysis gas, tar, synthesis gas and heat are prepared through solid fuel such as coal, biomass and solid waste.The device is mainly composed of the multi-layer fluidized bed, a cyclone separator and a recycle device.The multi-layer fluidized bed is mainly composed of a pyrolysis layer, a gasification layer and a combustion layer.The solid fuel is pyrolyzed in the pyrolysis layer first, volatile components are extracted in the mode of tar and pyrolysis gas, remaining semicoke is pyrolyzed and enters the gasification layer, partial gasification reaction is conducted on the remaining semicoke, oxygen and vapor, the synthesis gas is generated and output, part of gasified semicoke enters the combustion layer, is combusted with air and releases heat, hot ash generated after combustion is separated by the cyclone separator and conveyed back to the pyrolysis layer through a recycle valve, and heat required by pyrolysis of the solid fuel is provided.By means of the integrated device, the solid fuel is subjected to pyrolysis, gasification, combustion and staged conversion, and operation difficulty of the device is small.

Description

technical field [0001] The invention relates to the field of pyrolysis, gasification and combustion of solid fuel to produce oil, gas and heat, and in particular to a multilayer fluidized bed solid fuel pyrolysis, gasification and combustion graded conversion device and method. Background technique [0002] my country has abundant reserves of coal and biomass resources. Coal and biomass occupy an important position in my country's energy consumption and will remain dominant for a long period of time. The annual output of solid waste such as waste plastics, waste tires and waste textiles in my country is also very large, and it is urgent to be effectively utilized. If tar is extracted from solid fuels such as coal, biomass, and solid waste through pyrolysis, and gasification and combustion methods are used to produce pyrolysis gas, synthesis gas, and heat products, not only can various solid fuels be effectively used, but also Can increase product value. Tar can be hydrogen...

AI Technical Summary

Problems solved by technology

In this method, semi-coke is completely combusted and fully gasified, rather than partially gasified and then combusted. Therefore, semi-coke is not used in stages, and the conversion of semi-coke to complete gasification is also relatively difficult.

In addition, the furnace type used is also non-fluidized bed, and the adaptability of solid fuel is poor

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