摘要
在中空纤维膜接触器内研究了N-甲基二乙醇胺(MDEA)与甘氨酸钾(PG)所组成的混合吸收剂对烟气中CO_2的吸收性能,通过考察吸收剂浓度和配比对CO_2脱除率的影响,确定了混合吸收液最佳浓度为25%,最佳配比为2 mol/L MDEA+0.5 mol/L PG。在此基础上,探究了不同液相流速、吸收温度和压力下的CO_2吸收情况,结果表明,较高流速、温度和压力均有利于CO_2的吸收,流速为0.08 m/s时的平均脱除率相较0.02 m/s时提高了13.73%,温度从25℃上升到65℃时平均脱除率提高25.21%,0.45 MPa时的平均脱除率比0.15 MPa时提高67.31%,但过高的流速、温度和压力也同样会产生高能耗投入和设备腐蚀等问题,因此应该合理选择这3种操作参数的范围。
The absorption properties of CO_2 in flue gas were studied in the hollow fiber membrane contactor by the mixed absorbent composed of N-methyldiethanolamine( MDEA) and potassium glycinate( PG). The optimum concentration of mixed absorbing solution was 25% and the optimum ratio was2 mol/L MDEA + 0. 5 mol/L PG by studying the effect of concentration and ratio of absorbent on CO_2 removal rate. On the basis above,the absorption of CO_2 under different liquid flow rate,absorption temperature and pressure were investigated. The results show that higher flow velocity,temperature and pressure are all beneficial to the absorption of CO_2,when the flow velocity was 0. 08 m/s,the average removal rate was increased by 13. 73% compared with 0. 02 m/s,the average removal rate was increased by 25. 21%from 25 ℃ to 65 ℃,and the average removal rate at 0. 45 MPa was 67. 31% higher than that of0. 15 MPa. However,excessive flow velocity,temperature and pressure will also cause high energy input and equipment corrosion. Therefore,the range of these three parameters should be rationally chosen.
出处
《应用化工》
CAS
CSCD
北大核心
2018年第2期302-305,311,共5页
Applied Chemical Industry
基金
江西省科技计划项目(20151BBG70021)
关键词
二氧化碳
N-甲基二乙醇胺
甘氨酸钾
中空纤维膜
脱除率
carbondioxide
N-methyldiethanolamine
potassium glycinate
hollowfiber membrane
removal rate