High temperature CO2 capture using calcium oxide sorbent in a fixed-bed reactor.
The gas-solid reaction and breakthrough curve of CO(2) capture using calcium oxide sorbent at high temperature in a fixed-bed reactor are of great importance, and being influenced by a number of factors makes the characterization and prediction of these a difficult problem. In this study, the operating parameters on reaction between solid sorbent and CO(2) gas at high temperature were investigated. The results of the breakthrough curves showed that calcium oxide sorbent in the fixed-bed reactor was capable of reducing the CO(2) level to near zero level with the steam of 10 vol%, and the sorbent in CaO mixed with MgO of 40 wt% had extremely low capacity for CO(2) capture at 550°C. Calcium oxide sorbent after reaction can be easily regenerated at 900°C by pure N(2) flow. The experimental data were analyzed by shrinking core model, and the results showed reaction rates of both fresh and regeneration sorbents with CO(2) were controlled by a combination of the surface chemical reaction and diffusion of product layer.
Dou
Binlin
B
School of Energy and Power Engineering, Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology 116023, Dalian, China. bldou@dlut.edu.cn
Song
Yongchen
Y
Liu
Yingguang
Y
Feng
Cong
C
D000327:Adsorption; D000393:Air Pollutants / Q000302:isolation & purification; D017610:Calcium Compounds / Q000737:chemistry*; D002245:Carbon Dioxide / Q000302:isolation & purification*; D006358:Hot Temperature; D009584:Nitrogen; D010087:Oxides / Q000737:chemistry*
D000393:Air Pollutants; D017610:Calcium Compounds; D010087:Oxides; D002245:Carbon Dioxide; C016538:lime; D009584:Nitrogen