基于生物质与煤共气化的系统模拟分析

Simulation and Analysis on the Process of Co-gasification of Biomass and Coal

对所构建的生物质与煤共气化系统进行了流程模拟,研究气化反应温度、生物质掺混比wbio和水蒸气与生物质的质量比S/B对气化特性及热力学性能的影响规律。结果表明,提高气化反应温度和S/B将在一定程度上降低气化合成气的热值和气化效率,其主要原因是反应过程的热能消耗同步增加,即更多的原料化学能被释放出来。相对于煤单独气化过程,掺混一定比例的生物质会降低气化效率,但有利于提高合成气的热值,降低污染物的排放量。

A co-gasification system for biomass anti coal is developed in this work, and a commercial process simulated. The effects of gasification temperature, the blending ratio of hiomass and the S/B on the gasification performance are investigated. The results indi- cate Ihal the heat wflue ut＂ syngas and gasification efficiency will be reduced with the increase of the gasification temperature and the S/ B, because more ft^edstock should he oxidized for pn〉viding sufficient reaction hear of co-gasification. Compared with the stand-only gasification of coal, the gasification efficiency will be decreased with the rise of the blending ratio of biomass, whereas the heal value of syngas will be improved to some extent. Additionally, ＇the mitigation of CO2 and other pollutant emission will he achieved, since a part of tossil fnel is substituted by hiomass as renewahle energy.