【摘要】 采用流化床反应器并以CaSO4为载氧体,研究不同CO2-水蒸气气化介质条件下燃料反应器内煤化学链燃烧反应特性。实验结果表明:在950℃下,不同CO2/水蒸气体积配比气化介质下燃料反应器出口气体产物均无H2、CH4;随着CO2/水蒸气体积比的增大,煤气化-CaSO4还原反应速率下降,CO累积率单调递增,CO2捕集效率单调递减;CO2/水蒸气体积比1:3时SO2累积量出现最大值;CO生成率随时间呈单峰特性,而SO2生成量显现出多拐点与不对称的特性;在30min内煤-水蒸气、煤-CO2气化的碳转化效率分别为94.4%、92.5%,而与之对应的燃料反应器内CO2捕集效率为95.8%、62.0%。更多还原

【Abstract】 The effect of CO2/steam gasification medium on chemical looping combustion (CLC) of coal with CaSO4 oxygen carrier was investigated experimentally in a fluidized bed as a fuel reactor,coal gasification and CaSO4 reduction with the syngas took on simultaneously in the fluidized bed.The results show that neither CH4 nor H2 exists in the flue gas at 950℃.CO accumulation rate increases monotonously with an increase of CO2/steam volume ratio,and the efficiency of carbon conversion to CO2 decreases.There is a maximum of SO2 accumulation amount at the CO2/steam volume ratio 1:3.CO generation rate in the flue gas presents a parabolic curve as a function of reaction time,while SO2 generation amount presents a mluti-flexion and asymmetry curve.In the process of coal gasification,carbon conversion efficiency in 30 min reaches 94.4% with steam as a gasification medium,and 92.5% with CO2 as a gasification medium.However,in the corresponding process of coal gasification and CaSO4 reduction with the syngas the efficiency of carbon conversion to CO2 reaches 91.0% and 57.1%,respectively.更多还原