Advanced gasification of carbonaceous solid fuels:How to sequence the conversion steps?
Steam gasification of carbonaceous solid fuels (coal, biomass, etc) allows thermal-to-chemical energy recu-peration and chemical heat pumping, which greatly improve the efficiencies of syngas production and combined-cycle power generation. These particular functions are realized in the practical gasification only by enhancing steam con-sumption and thermal energy utilization while suppressing oxygen consumption, which results in reduction of gasifica-tion temperature to 800 °C even lower and therefore lower rate of thermochemical reactions involved therein. Results from our recent studies show that the products from the pyrolysis as the initial step in the gasification, I.e., char and volatiles strongly interact with each other, and the “volatile-char interaction (VCI) is a crucial factor for the character-istics of char/volatiles conversion into gases. This paper describes how important is VCI, how to suppress or intensify VCI, and then how to sequence the thermochemical conversion steps of coal/biomass for gasifying them completely at lower emperatures with minimized emission of tar.
coal biomass volatiles-char interaction alkali and alkaline earth metallic species pyrolysis coking
Jun-ichiro Hayashi
Center for Advanced Research of Energy Conversion Materials, Hokkaido University N13-W8, Kita-ku, Sapporo 060-8628, Japan
国际会议
第四届中日化工学术研讨会(The 4th Joint China/Japan Chemical Engineering Symposium)(CJCES)
成都
英文
2007-12-19（万方平台首次上网日期，不代表论文的发表时间）