Solid fuel fluidized bed pyrolysis, gasification and combustion graded conversion device and conversion method

Abstract

The invention discloses a solid fuel fluidized bed pyrolysis, gasification and combustion graded conversion device and a conversion method. The device and the method can be used for subjecting coal, biomass, solid waste and the like to pyrolysis, gasification and combustion graded conversion to produce pyrolysis gas, coal tar, synthesis gas and heat. The device mainly comprises a fluidized bed pyrolysis furnace and a multistage fluidized bed gasification and combustion furnace. The method includes pyrolyzing solid fuel in the fluidized bed pyrolysis furnace, extracting volatiles in the coal tar and the pyrolysis gas forms, conveying residual semicoke after pyrolysis into the multistage fluidized bed gasification and combustion furnace, enabling the residual semicoke to undergo gasification reaction partly in presence of oxygen and water vapor in a gasification layer to generate the synthesis gas to be outputted, delivering part of gasified semicoke into a combustion layer to combust in air and release heat, and conveying hot combusted ash into the pyrolysis furnace by taking the hot combusted ash as a heat carrier so as to provide heat required by solid fuel pyrolysis. The solid fuel fluidized bed pyrolysis, gasification and combustion graded conversion device and the conversion method achieve graded conversion and utilization of the solid fuel and particularly achieve gasification and combustion graded conversion of the semicoke.

Description

technical field [0001] The invention relates to the field of solid fuel pyrolysis gasification combustion to produce oil, gas and heat, in particular to a solid fuel fluidized bed pyrolysis gasification combustion graded transformation 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 hydrogenated to produce fuel oil...

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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