Effect of re-carbonation on CO2 capture by carbide slag and energy consumption in the calciner
Effect of re-carbonation on CO2 capture by carbide slag and energy consumption in the calciner
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再碳酸化对电石渣捕集CO2及分解炉能耗的影响
DOI：
10.1016/j.enconman.2017.07.006
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发表时间：
2017-09
影响因子：
10.4
通讯作者：
Song Haiping
中科院分区：
文献类型：
--
作者：
He Zirui;Li Yingjie;Zhang Wan;Ma Xiaotong;Duan Lunbo;Song Haiping
The re-carbonation was proposed to improve the CO2capture performance of the carbide slag, an industrial solid waste, calcined under high concentration of steam during the calcium looping process. The effects of re-carbonation conditions, including duration and CO2concentration on CO2capture by the cycled carbide slag were studied. The results show that the re-carbonation significantly improves the CO2capture capacity of the carbide slag. Notably, the re-carbonation dramatically reactivates the carbide slag which has experienced 11 cycles, increasing its carbonation conversion from 0.19 to about 0.6. In addition, the carbide slag shows higher re-carbonation conversions than the limestones reported by other researchers. A porous structure of the carbide slag is formed after the calcination from the extra CaCO3generated in the re-carbonation step, which improves its CO2capture capacity. In addition, the impacts of the re-carbonation on the CO2capture ratio of the calcium looping system and the energy consumption in the calciner were discussed. The re-carbonation improves the CO2capture ratio from 0.46 to 0.88 and reduces the energy consumption in the calciner from 321 kJ/mol CO2to 261 kJ/mol CO2, when the molar ratio of sorbent to CO2is 2 and the make-up ratio of the sorbent is 0.16 in the calcium looping system using the carbide slag. Thus, the re-carbonation and high concentration of steam in the calcination is an effective way to improve the CO2capture capacity of the carbide slag and reduce the energy consumption in the calciner during the calcium looping process.
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