焦炭
煤
热解
tar(计算)
烧焦
干法蒸馏
化学
燃烧热
流化床
石油焦
煤焦油
破坏性蒸馏
产量(工程)
废物管理
化学工程
碳化
材料科学
冶金
有机化学
吸附
燃烧
工程类
程序设计语言
计算机科学
作者
Yanchun Feng,Shaoping Xu,Kechao Wang,Chao Wang
标识
DOI:10.1016/j.fuproc.2022.107322
摘要
To solve the prevailing problems in industrial blue-coke production such as the low utilization of coal and the low calorific value of product gas, a novel blue-coke production technology using slack coal has been proposed. The coarse coal in the feed is pyrolyzed in a moving-bed pyrolyzer with the gasification gas (G-gas) from the fluidized gasification of the fine coal as the heat carrier, so that high-quality blue-coke, tar and gas are obtained. To elucidate the effect of G-gas on pyrolysis, the coarse coal pyrolyses in a moving-bed pyrolyzer were investigated under steam, CO 2 and G-gas atmospheres in the temperature range of 500–800 °C. Compared to N 2 atmosphere, the steam increased the tar yield below 700 °C due to the enhanced water-gas shift reaction. The CO 2 increased the tar yield around 600–700 °C because of the restrained decomposition of calcite in the coal. Above 600 °C, the coke's partial gasification under the reactive atmospheres led to increased gas yield and decreased coke yield; meanwhile, the specific surface area of the coke increased and the electrical resistivity decreased. The contribution of the reactive atmospheres was in the same order of their reactivities, i.e. steam > G-gas > CO 2 . • A novel blue-coke production technology using slack coal has been proposed. • Coal was pyrolyzed under reactive atmosphere in moving-bed pyrolyzer at 500–800 °C. • Steam enhanced tar yield at 500–700 °C by intensified water-gas shift reaction. • Reaction of coke with reactive atmospheres above 600 °C reduced its resistivity.
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