吸收烟气中低浓度CO2的操作条件分析

Mg(OH)2浆液是一种具备低再生能耗潜力的CO2吸收剂，为了推进其在CO2捕集领域的应用而展开研究。在填料塔中，使用真实烟气研究了各种操作条件下Mg(OH)2浆液对CO2的捕集效率。研究发现,填料种类、气体名义停留时间、液气比均对CO2捕集效率有影响。结果表明，增加气体名义停留时间无法有效改善液相传质，而提高液气比能够有效改善液相传质；在试验条件下，拉西环、鲍尔环和IMTP的总体积传质系数分别为8.5×10-7～5.0×10-6、1.8×10-6～4.0×10-6和1.9×10-7～2.9×10-6 mol/(m3·s·Pa)。

Operating conditions analysis for low concentration #br# CO2 absorption in flue gas

Mg(OH)2 is an absorbent of CO2 capture with low regeneration energy cost potential, and in order to promote its application in CO2 capture field, research has been carried out. In packed tower using real flue gas, a series of experiments were conducted under different operating conditions to test the capture efficiency of CO2 by Mg(OH)2 slurry. The results showed that the packing types, nominal gas residence time and liquid/gas ratio had effect on the capture efficiency of CO2. Liquid phase mass transfer was not improved by increasing the nominal gas residence time, but it was enhanced by raising the liquid/gas ratio. Under the experimental conditions, the overall volumetric mass transfer coefficient of the Rasching rings, Pall rings and IMTP were 8.5×10-7 5.0×10-6, 1.8×10-6 4.0×10-6 and 1.9×10-7 2.9×10-6 mol/(m3·s·Pa), separately.