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An experimental study on CO2 hydrate-based separation from flue gas with tetra-n-butyl ammonium bromide/cyclopentane solution

ZHAN Hao1,2,XU Chungang1,2,LI Xiaosen1,YAN Kefeng1   

  1. 1Key Laboratory of Renewable Energy and Gas Hydrate,Chinese Academy of Sciences,Guangzhou Institute of Energy Conversion,Guangzhou 510640,Guangdong,China;2 Graduate School of Chinese Academy of Sciences,Beijing 100049,China
  • Online:2012-07-25 Published:2012-07-05

TBAB和CP双添加剂水合物法分离烟气中的CO2

詹 昊1,2,徐纯刚1,2,李小森1,颜克凤1   

  1. 1中国科学院广州能源研究所天然气水合物开采及综合利用实验室,中国科学院可再生能源与天然气水合物重点实验室,广东 广州 510640;2中国科学院研究生院,北京 100049

Abstract: Experiments for CO2 separation from flue gas (CO2/N2) are conducted with the one-stage hydrate method using TBAB (tetra-n-butyl ammonium bromide,C16H36NBr) and CP (cyclopentane,C5H10) as joint additives. The effects of TBAB and TBAB/CP on hydrate formation and separation efficiency were investigated and compared. The suitable conditions of 276.15 K and 2.0—3.3 MPa along with initial liquid gas volume ratio of 0.78 and the CP volume concentration of 0.6 % were obtained. Under such conditions,the gas uptake with TBAB/CP joint additives was 1.5—2.0 times higher than that in TBAB solution. Meanwhile,the CO2 concentration in residual gas phase could be decreased from 17% to 7%. The split fraction of 60%—70% was also higher than that of 40%—50% in pure TBAB solution. The result demonstrated that TBAB/CP system was evidently helpful for hydrate-based CO2 capture from the flue gast.

Key words: CO2 separation, hydrate, tetra-n-butyl ammonium bromide (TBAB), cyclopentane (CP), flue gas, separation efficiency

摘要: 在四正丁基溴化铵(TBAB)和环戊烷(CP)双添加剂体系下进行了一级水合物法分离烟气中CO2的研究。对比了纯体系和双添加剂体系对水合物生成过程及分离效果的影响。获得了合适的操作条件(温度276.15 K,压力2.0~3.3 MPa)、初始液气比(0.78)、添加剂浓度(CP体积分数为0.6%)。在合适条件下,双添加剂体系相比纯TBAB体系水合过程的载气量达至1.5~2.0倍,剩余气相中CO2摩尔分数由17%降至7%,去除率由40%~50%上升到60%~70%。实验表明,双添加剂体系在水合物法CO2分离技术的分离效果及节能方面存在潜力,为工业化水合物法净化烟气提供了参考和标准。

关键词: CO2分离, 水合物法, 四正丁基溴化铵, 环戊烷, 烟气, 分离效率