煤化学链燃烧还原阶段的污染物抑制研究.pdf

中国工程热物理学会 燃烧学 学术会议论文 编号：094211 煤化学链燃烧还原阶段的污染物抑制 * 郑敏 ，沈来宏，肖军，秦翠娟 （东南大学热能工程研究所，南京 210096） (Tel: Email: mzheng_seu@) 摘要：基于CaSO4 载氧体的煤化学链燃烧，在CaSO4 与煤的还原阶段中存在污染物释放问题。针对 反应器气氛为还原性，在不同温度下研究了CaO 和CaSO4 的不同加入量对污染物的影响。结果表明， 950℃时，加入CaO 有利于抑制SO2 和CO，但其释放量仍较多；增加CaSO4 可以抑制CO，但会导 致 SO2 排放增加。由于添加 CaO 对煤气化具有催化作用，900℃是一个既有利于抑制气态污染物的 排放，也能保证煤气化-CaSO4 还原反应速率的温度；CaO 加入量为CaSO4 摩尔量1.9 倍时，可以抑 制90%的SO2 排放，具有较理想的脱硫效果。 关键词：化学链燃烧；还原反应；钙基载氧体；脱硫 Pollutants Control on Reductions of CaSO4 Oxygen Carrier with Coal in Chemical Looping Combustion ZHENG Min, SHEN Lai-hong, XIAO Jun, QIN Cui-juan (Thermal Engineering Research Institute of Southeast University, Nanjing 210096, Jiangsu Province, China) Abstract ：Chemical looping combustion （CLC ）with CaSO as an oxygen carrier is a novel combustion 4 technology with inherent CO separation. During the coal-fired CLC, the reduction of CaSO with coal via 2 4 gasification intermediate (the mixture of CO and steam with the CO and steam ratio 1/3) generates gas 2 2 pollutants. The removal of the SO2 as well as CO under reductive condition by means of different amount of CaO and CaSO4 were evaluated at different temperatures (900 and 950 ℃). When the temperature is at 950℃, the removal of SO2 and CO could be achieved by CaO, but the substances released are still significant. While adding more CaSO4 also reduces CO release, but it contributes to more S