SO2 removal performances of Al- and Mg-modified carbide slags from CO2 capture cycles at calcium looping conditions
SO2 removal performances of Al- and Mg-modified carbide slags from CO2 capture cycles at calcium looping conditions
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钙循环条件下 CO2 捕集循环中铝和镁改性电石渣的 SO2 去除性能
DOI：
10.1007/s10973-020-09622-x
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发表时间：
2020-04
影响因子：
4.4
通讯作者：
Wang Zeyan
中科院分区：
文献类型：
--
作者：
Bian Zhiguo;Li Yingjie;Wu Shuimu;Yan Xianyao;Zhao Jianli;Wang Zeyan
本文在热重分析仪和双固定床反应器上研究了钙环条件下CO2捕集循环燃烧合成的铝改性和镁改性电石渣的脱除SO2性能。研究了硫化温度、CO2捕集次数和煅烧条件对经过多次CO2捕集的铝、镁改性电石渣脱除SO2性能的影响。在800 ~ 950℃的硫化温度范围内，对多次CO2捕集循环的Al和mg改性电石渣去除SO2的能力影响不大。随着CO2捕集次数的增加，原渣和改性电石渣的硫化转化率迅速下降。而Al和mg改性电石渣由于具有良好的载体Ca3Al2O6和MgO，其SO2脱除能力和循环稳定性均明显高于原电石渣。Al和mg改性的电石渣在5 ~ 20 nm直径范围内具有更大的表面积和更大的孔隙体积，因此其去除SO2的能力高于原电石渣。在CO2捕集循环中，改性电石渣在高浓度蒸汽煅烧条件下比在高浓度CO2煅烧条件下表现出更高的抗烧结性能。因此，在高蒸汽浓度下煅烧的基于钙环的CO2捕集循环的铝和镁改性电石渣具有去除SO2的能力。
In this work, the SO2 removal performances of the aluminum- and the magnesium-modified carbide slags fabricated by the combustion synthesis from CO2 capture cycles at the calcium looping conditions were investigated in a thermogravimetric analyzer and a dual fixed-bed reactor. The effects of sulfation temperature, number of CO2 capture cycles and calcination condition on the SO2 removal performances of Al- and Mg-modified carbide slags experienced the multiple CO2 capture cycles were studied. The sulfation temperature in the range of 800–950 °C shows a little effect on SO2 removal capacities of Al- and Mg-modified carbide slags experienced the multiple CO2 capture cycles. As the number of CO2 capture cycles increases, the sulfation conversions of the original and modified carbide slags decrease rapidly. However, Al- and Mg-modified carbide slags possess obviously higher SO2 removal capacity and cyclic stability than original carbide slag due to the good supports Ca3Al2O6 and MgO, respectively. And the larger surface areas and volumes of pores in 5–20 nm in diameter of Al- and Mg-modified carbide slags promote the higher SO2 removal capacity than original carbide slag. The modified carbide slag shows higher sintering resistance in high concentration of steam calcination condition during the CO2 capture cycles, compared with high concentration of CO2 calcination condition. Therefore, Al- and Mg-modified carbide slags from CO2 capture cycles based on calcium looping calcined under high steam concentration achieve SO2 removal capacities.
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