超重力法脱除合成氨原料气中二氧化碳的实验研究

对应用旋转填料床于脱除合成氨原料气中二氧化碳进行了实验研究。采用在MDEA(N-甲基二乙醇胺)水溶液中加入少量烯胺TETA(三乙烯四胺)或氨基酸盐组成的复合溶液。主要考察了不同类型吸收液、吸收液二氧化碳负荷、超重力因子β、气液比等因素对合成氨原料气中二氧化碳脱除效率的影响。实验结果表明,在MDEA水溶液中加入TETA或氨基酸盐添加剂,大大提高了脱除效率,改善了传质速率,其中以TETA作为添加剂的混合吸收液的脱除效率在2种混合吸收液中最好,相对于单一的MDEA吸收液,混合吸收液的脱除效率平均提高了101.19%。在相同的操作条件下,脱除效率随着超重力因子β增大而增大,β大于120后对脱除效率的影响不明显;脱除效率随液气比的增大呈现出先增大后减小的趋势,其最佳液气比约为10 L/m3。超重力旋转填料床与传统塔设备相比,具有二氧化碳脱除效率高、低液泛、处理能力大、能耗和运行费用低、占地面积小、操作简便等优点,具有良好的工业应用前景。

Experimental Study on the Removal of Carbon Dioxide from Feed gas for Ammonia Synthesis by High Gravity Method

Applying a novel rotating packed bed to remov carbon dioxide from feed gas for ammonia synthesis was investigated experimentally.The new intensified transferring technique used an aqueous absorbent consisting of MDEA(N-methyl diethanolamine) + TETA(triethylenetetramine) or MDEA+ amino acid salts to absorb carbon dioxide.The influences of absorption solutions,carbon dioxide loading of absorbent,high gravity factors β and ratio of liquid to gas on carbon dioxide removal efficiency were examined.The results showed that the removal efficiency and mass transfer rate were improved obviously when adding TETA or amino acid salts as additive into aqueous MDEA,and TETA had higher removal efficiency than amino acid.Compared with aqueous MDEA,the removal efficiency of the blended absorption solution with TETA as additive increased by 101.19%.Under the same operation conditions,the removal efficiency increased with high gravity factors β increasing,however it wasn't obvious when high gravity factors was higher than 120.The removal efficiency firstly increased with the increase of the ratio of liquid to gas,then decreased gently,and the optimum ratio of liquid to gas was about 10 L/m3.High-gravity rotary packed bed,compared with traditional tower equipment,had high removal efficiency,low tendency of flooding,high process capacity,small spatial requirement,low energy consumption and operation cost,and operation is convenient,so it will have a promising future in industrial application.