湿法碳酸化电石渣干燥后在钙循环中的CO_2捕集（英文）

CO_2 capture by carbonated carbide slag seriflux after drying in calcium looping cycles

提出一种电石渣资源化利用的新方法．首先，将燃煤电站烟气通入电石渣浆液捕集CO2．碳酸化后的电石渣浆液（CCSS）干燥后在钙循环中作为吸收剂捕集CO2．在双固定床反应器和热重仪上研究了CCSS和电石渣的CO2捕集特性，包括碳酸化时间、煅烧温度和碳酸化温度对CCSS循环碳酸化特性的影响．结果表明CCSS的CO，捕集性能和碳酸化速率均高于电石渣．煅烧温度为950℃时，CCSS比电石渣具有更好反应活性，这有利于在恶劣煅烧条件下捕集CO2．在700～725℃，CCSS表现出了最佳的碳酸化性能．煅烧CCSS比电石渣孔隙结构更好，具有更大比表面积和比孔容，这有利于循环捕集CO2．

A new carbide slag （CS） seriflux utilization was proposed. The flue gas from a coal-fired plant was first bubbled into CS seriflux for CO2 capture. The obtained carbonated carbide slag seriflux （CCSS） was dried and utilized as a CO2 sorbent in the calcium looping cycles. The CO2 capture behavior of the dried CCSS and the raw CS was investigated in a dual fixed-bed reactor and a thermo- gravimetric analyzer. The effects of carbonation time, calcination temperature and carbonation temperature on CO2 capture performance of CCSS in the multiple carbonation/ calcination cycles were studied. The results show that the CO2 capture capacity of CCSS was higher than that of CS. Calcined at 950 ℃, CCSS shows better carbonation reactivity than CS, which benefits CO2 capture under severe calcination conditions. In the range of 700 to 725℃ for the carbonation, CCSS shows the optimal CO2 capture performance. The calcined CCSS shows better porous microstructure than the calcined CS. The calcined CCSS exhibits a larger surface area and pore volume in the cycles, which favors a higher CO2 capture capacity in the multiple cycles.