CO2 CAPTURE FROM FLUE GASES USING LIMESTONE UNDER DIFFERENT CONDITIONS
IntroductionThe use of the multiple carbonation reaction of CaO and its reversible calcination of CaCO3 is a suitable separation process of CO2 from flue gases. The dual-fluidized bed reactors (absorber and regenerator) are natural choices for such process. CaO is carbonated to CaCO3 at a relatively lower temperature (600-700°C) in the flue gases in absorbor, then removed from the absorber and decomposed back to CaO and CO2 in the regenerator at higher temperatures (850-950℃). In such process, CaO undergoes a decay of CO2 capture capacity during multicycle performance of carbonation/calcination reaction cycles 1-4. There are some special operating conditions which would affect the decay of CO2 capture capacity, but little work has been reported on these subjects. Therefore, the first aim of this work is to study the effect of particle size and calcination temperature on sorbent capacity of removing CO2 in multiple carbonation/ calcination cycle. In practical application, coal will be used to provide the heat required for the decomposition of CaCO3, potential effect of coal ash on sorbent deactivation is also studied. The reaction of CaO with CO2 has two stages: chemical kinetics controlled stage and product layer diffusion stage. The third aim of this work is to investigate the effect of different stage on decay of CO2 capture capacity during multiple carbonation/calcination reaction cycles.
Fan Fang Zhenshan Li Ningsheng Cai
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Thermal Engineering, Tsinghua University Beijing, 100084, China
国际会议
The 7th China-Korea Workshop on Clean Energy Technology(第七届中韩清洁能源技术研讨会)
太原
英文
279-280
2008-06-25（万方平台首次上网日期，不代表论文的发表时间）