摘要
化学吸收法特别是胺法捕获燃烧后尾气中的CO_(2)目前最具产业化应用前景。然而,传统胺溶液[以30%单乙醇胺(MEA)为基准]存在再生能耗高等难题,在填料塔内吸收CO_(2)可能会存在液泛、发泡、夹带等操作运行问题。胺基相分离型CO_(2)吸收剂吸收CO_(2)后,仅需送富CO_(2)相溶液去解吸,有望大幅降低CO_(2)解吸能耗。本文通过高效胺基相分离型捕获剂耦合中空纤维膜接触器强化CO_(2)吸收传质。首先,利用CO_(2)吸收-解吸筛选装置探究了几种吸收剂的CO_(2)吸收-解吸综合性能和分相特性,实验结果表明三乙烯四胺(TETA)-N,N-二乙基乙醇胺(DEEA)-环丁砜(TMS)-水具有较好的分相性能和CO_(2)捕获性能。然后,在中空纤维膜接触器内研究了CO_(2)负载量、TETA浓度、液相进料温度、液体流速、进口气速和CO_(2)分压对TETA-DEEA-TMS-H_(2)O相分离吸收剂CO_(2)吸收通量的影响规律。结果表明:CO_(2)吸收通量随CO_(2)负载量的增加而降低,随液相进料温度、液体流速、进口气速和CO_(2)分压的增大而增大,由于分相原因使CO_(2)吸收通量随TETA浓度的增加呈现先增大后减小的趋势;CO_(2)脱除率与进口气速和CO_(2)分压呈负相关关系。最后,建立了较准确的气相总传质系数KG的预测模型,其绝对平均误差为11.94%。
Chemical absorption methods,especially the amine method,are currently the most promising for industrialization of CO_(2) capture in post-combustion exhaust gases.However,traditional amine solutions[based on 30%monoethanolamine(MEA)]have high energy consumption for regeneration,and CO_(2) absorption in packed towers may have operational problems such as liquid flooding, foaming, and entrainment. The amine-based phase separation CO_(2) absorbent is expected to significantly reduce CO_(2) desorption energy consumption, because only the CO_(2)-rich phase solution needs to be sent for desorption. In this paper, the CO_(2) absorption mass transfer was enhanced by a highly efficient amine-based phase separation absorbent coupled with a hollow fiber membrane contactor. Firstly, the comprehensive CO_(2) absorption-desorption performance and phase-separation characteristics of several absorbents were investigated by using CO_(2) absorption-desorption device. The experimental results showed that triethylenetetramine (TETA)- diethylaminoethanol (DEEA) -cyclobutanesulfone (TMS) -water had better phase-separation and CO_(2) capture performance. Then, the effects of CO_(2) loading, TETA concentration, liquid phase temperature, liquid flow rate, inlet gas velocity, and CO_(2) partial pressure on the CO_(2) absorption flux of TETA-DEEA TMS-H_(2)O phase separation absorbent were investigated in a hollow fiber membrane contactor. The results showed that the CO_(2) absorption flux decreased with the increase of the CO_(2) loading and increases with the increase of the liquid phase temperature, liquid flow rate, inlet gas velocity, and CO_(2) partial pressure. At the same time, the CO_(2) absorption flux tended to increase and then decrease with increase of the TETA concentration due to phase separation. The CO_(2) removal rate had a negative correlation with the inlet gas velocity and CO_(2) partial pressure. Finally, a more accurate prediction model of the gas-phase total mass transfer coefficient KG was established with an absolute average deviation of 11.94%.
作者
吴大卫
尹一涵
曹智勇
林海周
范永春
高红霞
梁志武
WU Dawei;YIN Yihan;CAO Zhiyong;LIN Haizhou;FAN Yongchun;GAO Hongxia;LIANG Zhiwu(China Energy Construction Group Guangdong Electric Power Design and Research Institute Co.,Ltd.,Guangzhou 510663,Guangdong,China;Joint International Center for CO_(2) Capture and Storage(iCCS)/Hunan Provincial Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing CO_(2) Emissions/College of Chemistry and Chemical Engineering,Hunan University,Changsha 410082,Hunan,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2024年第11期6039-6048,共10页
Chemical Industry and Engineering Progress
基金
中国能建广东院院级科技项目(EV11211W)。
关键词
二氧化碳
相分离型吸收剂
膜接触器
吸收-解吸
传质
CO_(2) capture
membrane contactors
phase separation absorbent
absorption and desorption
mass transfer
