MDEA-PZ复合胺溶液吸收烟气中CO_2实验研究

Experimental Research of Absorption of Carbon Dioxide by MDEA-PZ Complex Amine Solutions from Flue Gas

采用搅拌实验装置,研究不同摩尔配比的MDEA-PZ复合胺溶液对烟道气中CO2的吸收和解吸性能,揭示了吸收速率、吸收量与吸收时间、pH值、电位之间的内在联系;对CO2初始逸出温度、试液再生温度、再生率、再生pH值下降率进行了分析。结果表明,MDEA-PZ二元复合体系吸收效果优于单组分MDEA、PZ的吸收效果。MDEA-PZ复合胺溶液摩尔配比为0.5∶0.5时,吸收效果最佳,吸收量约为0.8 mol.L-1;CO2初始逸出温度最低,为54℃;再生温度最低,为102℃;再生率最高,为88.61%;再生pH值下降率最低,为11.39%。MDEA-PZ复合体系的两种组分之间存在正交互作用。

A set of stirring experimental apparutus was used to study the capability of absorption and desorption of carbon dioxide from flue gas by different molar proportions of MDEA-PZ solution. The study revealed the relationship between absorption rate, absorption capacity and absorption time, pH value, potential. Meanwhile, the parameters were recorded and analyzed,including the initial escape temperature of CO2, regeneration temperature,regeneration rate,and pH value declining rate in regeneration. The results showed that,the MDEA-PZ binary complex system was superior to single MDEA or PZ in absorption efficiency. And the absorption effect was the best when the molar proportion of MDEA to PZ was 0. 5 ： 0. 5,for which the absorption capacity was 0.8 mol·L^-1 with a maximum regeneration rate of 88.61% and a minimum decline rate of pH value of 11.39% at the lowest regeneration temperature of 102 ℃ and the lowest initial escape temperature of CO2 of 54 ℃. There existed positive interaction between MDEA and PZ.