Abstract：In this paper, CaSO4/bentonite particle was prepared with industrial grade materials using mechanical mixing methods. The experiments were carried out in a fluidized bed, where the steam acted as the gasification fluidization medium. The effects of temperature in the reactor and cyclic reduction number on reactivity of CaSO4/bentonite with coal were discussed. It showed that the reactivity of the oxygen carriers was enhanced as temperature was increased from 820 ℃ to 900 ℃. At 900 ℃, the average dry basis concentration of CO2 approached 89.52% and there were no CH4 and H2 existing. The seven redox tests demonstrated that the CaSO4/bentonite oxygen carrier particles were featured by the high reactivity and excellent cycling stability. The carbon conversion rate was above 70% and CO2 concentration kept at 80% over seven redox cycles. X-ray diffraction analysis revealed that CaSO4 could be reduced into CaS which is also almost oxidized into CaSO4 without CaO generating.
Jia Weihua,Liu Yongzhuo,Hu Xiude et al. Investigation on Reactivity of CaSO4/Bentonite Oxygen Carrier in Coal Direct Chemical-Looping Combustion[J]. 化学反应工程与工艺, 2014, 30(1): 35-40.
