摘要
作为温室气体的主要成分,CO2的减排引起世界各国的密切关注。较之于传统的吸收方法,中空纤维膜吸收烟气中CO2是一种高效、具有良好发展前景的脱除方法。为此,基于膜吸收过程的传质机理,从膜材料、膜结构、吸收剂等方面阐述了其发展与现状,总结了吸收剂的吸收与再生特性,分析了CO2比例、气相流速与压力、液相流速与压力等因素对膜吸收过程的影响,并提出了一种采用中空纤维膜接触器分离烟气中CO2的方法及系统,试验流程主要包括烟气冷凝、膜吸收以及CO2解吸再生3大部分。同时也指出膜吸收法距离大规模的商业化应用还存在许多经济问题与技术难点亟待解决,未来膜吸收技术将主要解决以下4个方面的问题:①烟气来源;②吸收剂与膜材料的选择;③膜吸收经济性评估;④膜吸收过程的模拟优化。
The emission reduction of CO2 as the main contributor to greenhouse gases arouses wide public concern all around the world. Compared with the traditional methods, adopting hollow fiber membranes is a high-efficiency and prospective way for CO2 re- moval. In view of this, based on the mass transfer mechanism, we first introduced the development and status quo of the said meth- od in terms of membrane material, membrane structure, absorbent, etc. Also, we summarized the absorption and regeneration of absorbents, and analyzed the impacts of CO2 percentage, gas and liquid-phase flow speeds and pressures on the membrane adsorption process. On this basis, we presented an improved method of adopting a hollow fiber membrane contactor for COz capture as well as its testing process flow including condensation of exhaust gas, membrane adsorption, and CO2 desorption and regeneration. On the other hand, we also pointed out that there is still a long way for membrane-based technologies to be put into commercial use due to many economic problems and technical difficulties and the future membrane-based technologies for C02 capture should focus on the following issues： source of exhaust gas; selection of absorbent and membrane material; economic evaluation of membrane absorp- tion; and simulation and optimization of membrane adsorption process.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2014年第1期114-123,共10页
Natural Gas Industry
基金
中央高校基本科研业务费资助项目(编号:CDJZR12140034)
中国烟草总公司重庆市公司科技计划重点项目(编号:NY20130501010010)
关键词
中空纤维膜
吸收
烟气
二氧化碳
传质
减排
模拟优化
经济性评估
技术攻关
hollow fiber membrane, absorption, exhaust gas, CO2, mass transfer, emission reduction, simulation and optimization, economic evaluation
