CaO/MgO和CaO/Ca9Al6O18同时捕集CO2/SO2的循环吸收特性

摘要

以葡萄糖酸钙与葡萄糖酸镁及L-乳酸铝为前驱物,湿法制得了四种CaO/MgO和CaO/Ca9Al6O18吸收剂,并进行了同时捕集CO2/SO2的实验.考察了吸收剂种类、质量配比、SO2浓度及煅烧温度等对吸收剂吸收性能的影响.结果表明,CaO/MgO(质量比为75％/25％)吸收剂和CaO/Ca9Al6O18(质量比为75％/25％)吸收剂分别保持了最好的吸收CO2能力和最好的循环稳定性.SO2严重阻碍了吸收剂对CO2的捕集.SO2浓度越高,吸收剂吸收CO2能力下降的越快,但同时吸收SO2的转化率也越高.数次循环后,总的Ca利用率开始上升,且SO2浓度越高,上升趋势越明显.煅烧温度对CaO/MgO吸收剂和CaO/Ca9Al6O18吸收剂循环吸收特性的影响略有不同.%Four sorbents were prepared with CaO/MgO or CaO/Ca,Al6O18 that was produced from precursors of calcium D-gluconate monohydrate, magnesium D-gluconate hydrate and aluminum L-lactate hydrate with a simple wet mixing method. The effects of sorbent type, mass proportioning, SO2 concentration and calcination temperature on the adsorption capability of sorbent were studied. The results show that CaO/MgO( weight ratio 75%/25% )keeps the best CO2 capture capability, while CaO/CaO/Ca9Al6O18( weight ratio 75%/25% )keeps the best cyclic stability. The CO2 capture process is drastically affected by SO2. The CO2 capture capacity drops quickly when the SO2 concentration increases. However, the cumulative SO2 capture capacity increases at the same time. The total calcium utilization rises tenderly after many cycles, which becomes more obvious with increasing the SO2 concentration. The effect of calcination temperature on the adsorption characteristic of CaO/ MgO and Ca0/Ca0/Ca,Al6O,8 differs little.