摘要
采用分步脱除矿物质方法 ,对义马原煤及HCl,HCl HF ,HCl HNO3 处理后煤样 ,分别在固定床反应器中考察了热解部分气化下硫的脱除规律 .结果表明 :一方面在热解过程中原煤及酸处理煤样H2 S和COS的析出均呈双峰趋势 ,其析出值主要受温度、原煤中灰分和HNO3 氧化作用 ;另一方面 ,在部分气化和酸处理后煤样热解半焦在 6 0 0℃～ 90 0℃范围内硫脱除率可达5 0 %～ 80 % ,80 0℃时 ,无机硫可完全脱除 .而原煤热解半焦总硫 ,无机硫的脱除率在 70 0℃时最大 .气化温度的升高 ,加强了碱性矿物质的固硫作用 ,其结果是 90 0℃气化时 ,总硫和无机硫脱除率降低 .酸处理后有机硫含量基本保持不变 ,其噻吩结构只随碳骨架的气化而析出 .
In this study, the effect of acid treatment of Yima coal on predesulfurization during pyrolysis and partial gasification were investigated. The coal was treated with HCl,HCl-HF and HCl-HNO 3 solution, in which different minerals were eliminated. The whole process could be divided into pyrolysis and partial gasification. In pyrolysis process, the evolution of H 2S and COS show two peaks, which were 450℃ and 600℃ respectively. At high temperature, the amount of H 2S evolution from acid treated coal was markedly increased compared to the raw coal through the elimination of minerals. In the case of HCl-HNO 3 treated sample, the H 2S evolution in the low temperature region, below 500℃, was reduced and the COS evolution in higher temperature region, above 500℃,was increased by the chemical oxidation. In the partial gasification process, the sulfide sulfur removal of acid treated coal char was increased, reached about 100% at 800℃. The maximum of total and sulfide sulfur removal of parent coal char were 46.39% and 52.97% at 700℃. Compared to acid treated coal char, the effect of alkaline minerals for fixing sulfur was strengthened with increasing the temperature. The organic sulfur of acid treated coal char was released with carbon gasification, and the value could be constant.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2004年第1期149-153,共5页
Environmental Science
基金
国家重点基础研究发展规划项目 (G19990 2 2 10 5 )
关键词
硫
热解
部分气化
酸处理
灰分
预脱硫
sulfur
pyrolysis
partial gasification
acid treatment
minerals
predesulfurization
