Combined Gasification of Woody Biomass and Coal in Down-flow Entrained Bed

摘要

Co-gasification experiment with woody biomass and coal was carried out in down-flow entrained gasifier. Pulverized woody biomass and pulverized coal was used as the feedstock, and mixing feedstock was prepared with woody biomass and coal in the different mixing ratio. Oxygen was used as gasifying agent and nitrogen was used for the carrier gas of feedstock. Feedstock and oxygen was injected from the top to gasifer with a burner. Operation gasification temperature was controlled over 1200 K to avoid tar component generation. Injecting feedstock rate, feedstock mixing ratio and oxygen ratio was the operation parameter. Injecting feedstock ratio was 180-200 g/min, woody biomass mixing ration was 0-100% and oxygen ratio was around 0.4-0.7 in this experiment. The temperature of gasifier, produced gas composition and produced gas volume from the gasifier was measured during the gasification experiment. Carbon conversion, cold gas efficiency and overall apparent gasification rate was calculated from the produced gas composition and produced gas volume. The gasification temperature and produced gas composition was varied by the feeding ratio, and the mixing feedstock achieved the highest cold gas efficiency as well as woody biomass feedstock.