摘要
以工业级硫酸钙和膨润土为原料,通过机械混合法,制备了具有高强度的钙基载氧体。同时,在小型高温流化床上,以水蒸气为气化剂,考察了不同温度下载氧体与煤的反应活性和循环反应性。实验结果表明, CaSO4/膨润土载氧体具有高的机械强度。在820~900℃,载氧体与煤反应性随温度升高而增强。反应温度为900℃时,气体产物中CO2平均浓度为89.52%,基本不存在CO和CH4。随着还原/氧化循环数增加,载氧体表现良好的反应性,7次循环反应后,碳转化率在70%以上,CO2的平均体积含量保持在80%左右。X射线衍射分析表明,载氧体的还原产物为CaS,未生成CaO副产物。
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.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
2014年第1期35-40,共6页
Chemical Reaction Engineering and Technology
基金
国家自然科学基金(21276129
20876079)
Korea Institute of Energy Research(KIER
B4-2431-03)
关键词
钙基复合载氧体
煤
化学链燃烧
循环反应性
Ca-based compound oxygen carrier
coal
chemical-looping combustion
cycle reactivity