超重力吸收与批式解吸工艺结合用于乙醇胺(MEA)-乙醇溶液沼气脱碳的研究

利用超重力反应器对乙醇胺（MEA）-乙醇溶液用于沼气脱碳的吸收性能进行了研究，将批式解吸工艺用于沼气脱碳，对使用了加热器的MEA-乙醇富液的批式解吸性能进行分析。研究发现进液量、进液MEA含量和转子转速的升高以及进气量、进气CO₂含量的降低会提升脱碳效果；最佳转子转速为1 000 r/min，此时当进入超重力反应器的n（CO₂）/n（MEA）<0.4时CO₂去除率可以接近100%；解吸液CO₂负荷最低可以达到0.03 mol/mol；在MEA浓度4.92 mol/L、解吸时间20 min时，单位解吸能耗（释放单位质量CO₂的能耗）达到最低，为3.17 MJ/kg，此时解吸液负荷为0.16 mol/mol。批式解吸可以通过控制解吸时间准确地调节解吸液CO₂负荷，吸收-解吸循环次数的增加不会导致脱碳效果的恶化。

High gravity absorption and batch desorption of CO2 from biogas using a monoethanolamine(MEA)/ethanol solution

This study focuses on the following aspects of the absorption-desorption of CO₂ from biogas using a monoethanolamine (MEA)/ethanol solution:absorption performance in a rotating packed bed (RPB), batch desorption performance using a heater and recycle performance. The results showed that the CO₂ absorption performance can be improved by increasing the liquid flow rate, MEA concentration and rotational speed, and by decreasing the gas flow rate and inlet CO₂ content. The optimum rotational speed was 1 000 r/min, under which conditions the CO₂ removal efficiency reached nearly 100% when the molar ratio of inlet CO₂ to inlet MEA was less than 0.4. In the case of desorption, the liquid CO₂ loading could reach as low as 0.03 mol/mol. The minimum energy consumption per unit CO₂ was 3.17 MJ/kg, obtained with an MEA concentration of 4.92 mol/L, liquid CO₂ loading of 0.16 mol/mol, and desorption time of 20 minutes. An increase in the number of cycles did not lead to any degradation of the absorbent.