CIESC Journal ›› 2020, Vol. 71 ›› Issue (5): 2099-2108.DOI: 10.11949/0438-1157.20191432

• Separation engineering • Previous Articles     Next Articles

Investigation on separation of CO2 from biogas by hydrate method in impinging stream reactor

Shuqi FANG1,2(),Xinyue ZHANG1,Siqi LI1,Donghao BAI1,Jing BAI1,2()   

  1. 1.School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, Henan, China
    2.Outstanding Foreign Scientists’ Workroom, Zhengzhou 450001, Henan, China
  • Received:2019-11-26 Revised:2020-02-28 Online:2020-05-05 Published:2020-05-05
  • Contact: Jing BAI

撞击流式反应器内水合物法分离沼气中CO2研究

方书起1,2(),张欣悦1,李思齐1,白东豪1,白净1,2()   

  1. 1.郑州大学化工与能源学院,河南 郑州 450001
    2.河南省杰出外籍科学家工作室,河南 郑州 450001
  • 通讯作者: 白净
  • 作者简介:方书起(1964—),男,硕士,教授,fangsq@zzu.edu.cn
  • 基金资助:
    国家自然科学基金项目(U1404519);河南科技智库项目(2019-20B);中国博士后科学基金面上项目(2016M602260)

Abstract:

The characteristics of CO2 separation in biogas by hydrate method in impinging flow reactor were investigated experimentally. Two different systems, pure water and sodium dodecyl sulfate (SDS), were selected to investigate the effects of pressure, temperature and impact intensity during hydrate formation process. The experimental results showed that the increase of pressure in pure water system or SDS system was conducive to the rapid formation of hydrate, but not conducive to the CO2 capture. By changing the impact intensity of the impinging stream reactor, it was found that the CO2 separation factor (S.F.) reached the maximum in both systems when the impact intensity was 0.128, the maximum value of S.F were 138.9 and 64.5, respectively.The experimental results showed that the additive SDS could promote the formation of hydrate, and the optimal concentration was 600 mg/L when the gas consumption,CO2 recovery S.Fr.(CO2) and CH4 recoveryS.Fr.(CH4) reached the maximum. However, the promotion effect of SDS on CH4 hydrate formation process was greater than that of CO2 hydrate, which was not conducive to the CO2 separation from biogas, but the separation factor of CO2 would be reduced.

Key words: hydrate, biogas, separation, CO2 capture, separation factor

摘要:

实验考察了撞击流式反应釜内水合物法分离沼气中CO2的特性。选取纯水和十二烷基硫酸钠(SDS)两个不同的体系,考察了水合物生成过程中压力、温度、撞击强度的影响。实验结果表明在纯水体系和SDS体系下压力的升高均有利于水合物的快速生成,但并不利于沼气中的二氧化碳捕集;实验通过改变撞击流式反应器的撞击强度发现,当撞击强度为0.128时,CO2分离因子(S.F.)在纯水和SDS两种体系下均达到最大,纯水体系下S.F.的最大值为138.9,SDS体系下S.F.的最大值为64.5;实验结果表明添加剂SDS可以促进水合物的生成,最适宜的浓度为600 mg/L,此时耗气量、CO2水合率S.Fr.(CO2)和CH4水合率S.Fr.(CH4)达到最大,但SDS对CH4水合物生成过程的促进作用大于CO2水合物,反而不利于CO2的分离,降低CO2的分离因子。

关键词: 水合物, 沼气, 分离, 二氧化碳捕集, 分离因子

CLC Number: