Highly efficient gas-steam cogeneration method and system based on biomass gasification and methanation

摘要

PROBLEM TO BE SOLVED: To provide an effective gas-steam cogeneration method and system based on biomass gasification and methanation. A biomass gasification unit, a conversion unit, a purification unit, a methanation unit, and a methane concentration unit are included. The gasification unit uses a local external constant high temperature heat source to significantly improve the effective gas composition of CO and H2 and improve biomass gasification efficiency. The gasification unit can greatly reduce the amount of tar produced at high temperatures, improve the carbon return rate and eliminate the investment in tar removal equipment. In the methanation process, CO conversion efficiency reaches 100% and H2 conversion efficiency reaches 99%. Further, a large amount of by-product superheated steam is generated, and the power consumption of the recycle compressor in the conventional methanation reaction is reduced. As an effect of the present invention, biomass energy can be converted into natural gas that is clean, has a large calorific value, and is easy to use. It can be effectively reused in quality superheated steam production mode. [Selection] Figure 1