摘要
在热天平和固定床装置上研究了CaO脱除H2S过程中可逆反应的变化规律。实验结果表明,脱硫过程的最佳温度为Ca(OH)2 分解温度(在二氧化碳不存在情况下);水蒸气和H2 是影响CaO脱硫可逆反应的两个重要因素,提高水蒸气体积分数无论热力学和动力学都有利于逆反应的进行,使得脱硫效率降低,提高H2 体积分数可抑制逆反应进行,当H2 的体积分数达到一定值时,由多个反应构成的逆反应变为单个反应,高温脱硫精度则由反应(CaO+H2S=CaS+H2O)决定。对通过CaS水蒸气反应实现CaS转化或再生也作了讨论。
The reversible reaction of gas desulfurization by CaO was investigated using a thermal balance and a fixed-bed reactor. The results show that there is an optimum desulfurization temperature, i. e. the decomposition temperature of Ca(OH)2 in the absence of carbon dioxide, and the steam and hydrogen have different effects on the reversible reaction of desulfurization. Increasing the concentration of steam benefits the reverse reaction both in thermodynamics and kinetics, which decreases the efficiency of desulfurization. However, the effect of hydrogen on the reverse reaction at high temperature is negative. As the concentration of hydrogen increases to a certain value, the reverse reaction becomes a single reaction instead of multiple reactions, and the efficiency of desulfurization can be determined by the thermodynamic properties of reaction (CaO + H2S = CaS + H2O). In addition, the possibility to use the CaS/H2O reaction to deal with the waste CaS is discussed.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2005年第2期146-149,共4页
Journal of Fuel Chemistry and Technology
基金
国家高技术研究发展计划(863项目
2002AA529080)。~~
关键词
氧化钙
脱硫
可逆反应
CAS
CaO
desulpurization
reversible reaction
CaS
