摘要
在N2气氛下,利用热重分析仪和管式炉,研究了不同粒径还原剂高硫煤条件下磷石膏分解过程中CaS的产生机理.结果表明:在1 000～1 150℃的范围内,CaS主要是由磷石膏中的CaSO4与高硫煤气化产生的CO反应产生.在CaSO4分解过程中CaS与CaO的生成反应存在明显的平行竞争现象.CaS的产生机理可以通过缩芯模型进行合理解释.对磷石膏分解的固相及气相产物进行的物性分析表明,不同粒径高硫煤对CaS生成量的影响主要是通过控制煤粉气化过程及后续反应来实现的.
The mechanism of CaS generation in the process of phosphogypsum decomposition was investigated with a thermogravimetric analyzer and tube furnace.High-sulfur coal with different particle diameters was used as a reducing agent under N2 atmosphere.The results showed that the chemical reaction between CaSO4 in the phosphogypsum and CO from high-sulfur coal gasification was the key process controlling CaS generation in the range of 1000-1150 ℃.In parallel,CaSO4 was converted to CaS and CaO during the course of CaSO4 decomposition.The mechanism of CaS generation could be well explained by the shrinking core model.The influence of coal particle size on CaS generation was investigated by studying the gas and solid products.The coal particle size could control the process of vaporization reactions and thus control the following reactions.
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2010年第10期1306-1311,共6页
Research of Environmental Sciences
基金
国家高技术研究发展计划(863)项目(2007AA06Z321)
关键词
磷石膏
高硫煤
CAS
缩芯模型
机理分析
phosphogypsum
high-sulfur coal
calcium sulfide
shrinking core model
mechanism analysis
