欢迎访问过程工程学报, 今天是

过程工程学报 ›› 2018, Vol. 18 ›› Issue (2): 318-323.DOI: 10.12034/j.issn.1009-606X.217264

• 反应与分离 • 上一篇    下一篇

基于中空纤维膜的混合富CO2吸收液解吸及再生

张卫风， 马伟春*， 黄 珍， 李 靳， 焦月潭， 钟林新   

  1. 华东交通大学土木建筑学院，江西 南昌 330013
  • 收稿日期:2017-06-23 修回日期:2017-09-01 出版日期:2018-04-22 发布日期:2018-04-10
  • 通讯作者: 马伟春 958383117@qq.com
  • 基金资助:
    江西省科技计划项目

Desorption and Regeneration of Mixed CO2-rich Solution Based on Hollow Fiber Membrane

Weifeng ZHANG,  Weichun MA*,  Zhen HUANG,  Jin LI,  Yuetan JIAO,  Linxin ZHONG   

  1. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, Jiangxi 330013, China
  • Received:2017-06-23 Revised:2017-09-01 Online:2018-04-22 Published:2018-04-10

PDF

摘要： 用中空纤维膜接触器(FMC)作解吸装置，选取N-甲基二乙醇胺(MDEA)?二乙醇胺(DEA)混合吸收剂为富CO2吸收液进行膜法解吸及再生实验，考察了解吸温度、解吸压力和液相流速对解吸效果的影响，研究了再生液的CO2二次吸收和解吸性能. 结果表明，在取样时间20和40 min下，混合吸收剂最佳溶质摩尔比为MDEA:DEA=1:0.6. 适当增大解吸温度、液相流速及负压压强可有效提高CO2的释放流量和解吸率. 60℃时CO2释放流量峰值为101.29 mL/min (峰值前移)，CO2最终解吸率为61.51%，比30℃时分别提高了56.14%和50.5%；解吸压力20 kPa时CO2释放流量峰值和最终解吸率分别为96.17 mL/min (峰值前移)和58.66%，比65 kPa时分别提高了62.21%和16.85%. 流速为0.08 m/s时CO2释放流量峰值为88.65 mL/min (峰值未前移)，最终解吸率为55.63%，比0.02 m/s时分别提高了43.45%和30.13%. MDEA?DEA再生液循环使用5次后CO2吸收容量为原液的70%，二次解吸率为原液的60%，无明显下降. 膜法解吸混合富CO2吸收液效果良好，且再生液具有优异的二次吸收和解吸性能.

关键词: 中空纤维膜, 混合吸收剂, 富液, 释放流量, 解吸率

Abstract: Membrane desorption and regeneration experiments were carried out in which hollow fiber membrane contactor (FMC) was used as desorption device, and N-methyldiethanolamine (MDEA)–diethanolamine (DEA) mixed absorbent was used as CO2-rich solution. The effects of desorption temperature, pressure and liquid flow velocity on desorption were investigated. The CO2 secondary absorption and desorption properties of the regenerated solution was further explored. The results showed that the optimum solute malor ratio of mixed absorbent was MDEA:DEA=1:0.6 at the sampling time of 20 and 40 min. CO2 releasing flux and desorption rate increased with the increasing of temperature, pressure and flow velocity. The peak CO2 releasing flux at 60℃ was 101.29 mL/min (the peak moved forward), the CO2 final desorption rate was 61.51%, comparing with the 30℃ group increased by 56.14% and 50.5%, respectively. The peak CO2 releasing flux at 20 kPa was 96.17 mL/min (the peak moved forward), the CO2 final desorption rate was 58.66%, comparing with the 65 kPa group increased by 62.21% and 16.85%, respectively. At a liquid flow velocity of 0.08 m/s, the peak CO2 releasing flux was 88.65 mL/min (the peak time did not move forward), and the CO2 final desorption rate was 55.63%, that was 43.45% and 30.13% higher than the 0.02 m/s group, respectively. Regeneration solution recycling test found that, MDEA?DEA regeneration solution retains 70% CO2 absorption capacity of the original solution after 5 cycles, the secondary desorption rate remained at around 60% without a significant decrease as well. Desorption of mixed CO2-rich solution by membrane method had a good effect, and the regeneration solution possessed excellent secondary absorption and desorption properties.

Key words: Hollow fiber membrane, Mixed absorbent, Rich solution, Releasing flux, Desorption rate