Method for preparing synthesis gas through biomass pyrolysis gasification coupling and system adopted by method

Abstract

The invention belongs to the field of biomass energy, and particularly relates to a method for preparing synthesis gas by biomass pyrolysis gasification coupling and a system adopted by the method. The method comprises the following steps of (1) feeding a biomass raw material into a microwave pyrolysis reactor for reaction to obtain a pyrolysis volatile component and a pyrolysis solid-phase material, (2) feeding the pyrolysis solid-phase material into a gasification reactor to be in contact with an activating agent for gasification reaction, so as to obtain crude synthesis gas and biochar, (3)converging the pyrolysis volatile component and the crude synthesis gas, and feeding into a gas reforming converter from one direction, and feeding the biochar into a gas reforming converter from another direction to prepare a target product. The system comprises a biomass bin (1), a microwave pyrolysis reactor (2), a gasification reactor (3), a gas reforming converter (8) and a gas-solid separator (12). The method is beneficial to gas-solid two-phase sufficient reaction, the process cost of preparing the synthesis gas from the biomass can be remarkably reduced, and the target product qualityis high.

Description

technical field [0001] The invention belongs to the field of biomass energy, and in particular relates to a method for producing synthetic gas coupled with biomass pyrolysis and gasification and a system used therein. Background technique [0002] Biomass energy has increasingly become an important way to replace traditional petrochemical energy due to its advantages of low cost, large quantity and wide range. The use of biomass to produce high-quality fuels for transportation has always been a key research goal. At present, the pyrolysis oil obtained by directly pyrolyzing biomass generally has the problems of complex composition and poor property stability, which seriously affects the refining and application of bio-oil. The method of converting biomass into syngas and then preparing biomass synthetic oil through Fischer-Tropsch synthesis can not only overcome the bottleneck problem of pyrolysis oil, but also produce biomass fuel with properties close to conventional gaso...

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Problems solved by technology

[0004] Aiming at the problem of poor quality of synthesis gas produced from biomass, Chinese patent 201811268055.5 discloses a method for producing synthesis gas from biomass gasification. Cracking of carbon chains and promoting the generation of hydrogen are beneficial to improve the quality of biomass synthesis gas, but the cost of gasification additives used in this invention is relatively high, and the recycling of gasification additives is not explained, so there is a problem that it is difficult to apply

Chinese patent 201910982072.3 discloses a method for reducing the tar content in the synthesis gas of a biomass fluidized bed gasifier. The fly ash loaded with calcium oxide is transported to the gasifier as a bed material, so that the catalytic cracking of tar in the furnace is effective. To reduce the tar content, this method uses fly ash instead of conventional bed materials, which can significantly reduce the process cost, but the impact of the newly generated ash in the process on the performance of the bed material and how to maintain the stability of the bed material performance have not been explained, which has a great impact process suitability

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