煤化学链燃烧还原阶段的污染物抑制  

POLLUTANT CONTROL ON REDUCTIONS OF CaSO_4 OXYGEN CARRIER WITH COAL IN CHEMICAL LOOPING COMBUSTION

作　　者：郑敏[1] 沈来宏[1] 肖军[1] 秦翠娟[1] 

机构地区：[1]东南大学热能工程研究所,江苏南京210096

出　　处：《工程热物理学报》2010年第10期1780-1784,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.90610016);国家重点基础研究发展规划基金项目(No.2006CB20030201;No.2006CB705806);国家863高技术基金项目(No.2006AA05Z318)

摘　　要：基于CaSO_4载氧体的煤化学链燃烧,在CaSO_4与煤的反应阶段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CaSO_4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SO_2和CO,但其释放量仍较多;增加CaSO_4可以抑制CO,但会导致SO_2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-CaSO_4还原反应速率的温度;CaO加入量为CaSO_4摩尔量1.9倍时,可以抑制90%的SO_2排放,具有较理想的脱硫效果。Chemical Looping Combustion（CLC） with CaSO4 as an oxygen carrier is a novel combustion technology with inherent CO2 separation. During the coal-fired CLC, the reduction of CaSO4 with coal via gasification intermediate （the mixture of CO2 and steam with the CO2 and steam ratio 1：3） generates gas 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 SO2 release. However, 900℃ is a suitable temperature for removal of SO2 as well as reaction rate due to the catalysis of CaO on coal gasification. And when the mole ratio of CaO to CaSO4 is 1.9 with a fixed CaSO4 mass, 90% SO2 release can be suppressed.

关 键 词：化学链燃烧 钙基载氧体 CO2分离 污染物抑制 

分 类 号：TQ546[化学工程—煤化学工程]