SDS和THF对水合物法捕集模拟烟气中CO_2的影响
|
摘要
采用搅拌式反应釜水合物生成实验装置研究动力学促进剂十二烷基硫酸钠(SDS)和热力学促进剂四氢呋喃(THF)对水合物法捕集CO_2的影响,用摩尔分数为25%的CO_2和75%的N_2混合气模拟烟气,分别探究不同浓度的SDS和THF对分离效果的影响;在此基础上,研究了不同初始压力、反应温度对分离效果的影响。结果表明,SDS和THF的存在都能提高CO_2回收率,但同时会降低分离因子。设定初始温度为3.5℃,初始压力为9.2 MPa时,加入质量分数为0.01%的SDS溶液后,CO_2回收率较纯水中增大了4.3%,分离因子较纯水中降低了44.8%;设定初始温度为6.5℃,初始压力为3.7 MPa时,加入摩尔分数为0.5%的THF溶液后,CO_2回收率较纯水中增大了30.4%,分离因子较纯水中降低了72.8%。在实验条件下,适宜的SDS质量分数为0.01%～0.05%,THF摩尔分数为0.5%～2%,初始压力的增加可以有效缩短水合反应的诱导时间,增大储气密度、CO_2回收率和分离因子,降低温度能有效提高分离效果。
A stirred-kettle hydrate production experimental device was used to study effects of dynamic accelerator SDS(twelve sodium dodecyl sulfate) and thermodynamic accelerator THF(tetrahydrofuran) on CO_2 captured from simulated flue gas by hydrate based gas separation(HBGS). Mixed gas contained CO_2 with a mole fraction of 25% and N_2 with a mole fraction of 75% was used to simulate flue gas. The effects of different concentrations of SDS and THF on the separation effect were studied. On this basis, the effects of different initial pressures and different reaction temperatures on the separation efficiency were studied. The results showed that both SDS and THF could increase the CO_2 recovery, but simultaneously reduce the separation factor. When the temperature was 3.5 ℃ and the initial pressure was 9.2 MPa, adding 0.01 wt% SDS, the CO_2 recovery increased by 4.3% and the separation factor decreased by 44.8% compared with pure water. When the temperature was 6.5 ℃ and the initial pressure was 3.7 MPa, adding 0.5 mol% THF, the CO_2 recovery increased by 30.4% and the separation factor decreased by 72.8% compared with pure water. Under experimental conditions, more appropriate concentration of SDS and THF are 0.01 wt%-0.05 wt% and 0.5 mol%-2 mol%, respectively. The initial pressure increaseing can effectively shorten the hydration reaction induction time, increase the gas storage density, CO_2 recovery and separation factor. Reducing the temperature can effectively improve the separation efficiency.
A stirred-kettle hydrate production experimental device was used to study effects of dynamic accelerator SDS(twelve sodium dodecyl sulfate) and thermodynamic accelerator THF(tetrahydrofuran) on CO_2 captured from simulated flue gas by hydrate based gas separation(HBGS). Mixed gas contained CO_2 with a mole fraction of 25% and N_2 with a mole fraction of 75% was used to simulate flue gas. The effects of different concentrations of SDS and THF on the separation effect were studied. On this basis, the effects of different initial pressures and different reaction temperatures on the separation efficiency were studied. The results showed that both SDS and THF could increase the CO_2 recovery, but simultaneously reduce the separation factor. When the temperature was 3.5 ℃ and the initial pressure was 9.2 MPa, adding 0.01 wt% SDS, the CO_2 recovery increased by 4.3% and the separation factor decreased by 44.8% compared with pure water. When the temperature was 6.5 ℃ and the initial pressure was 3.7 MPa, adding 0.5 mol% THF, the CO_2 recovery increased by 30.4% and the separation factor decreased by 72.8% compared with pure water. Under experimental conditions, more appropriate concentration of SDS and THF are 0.01 wt%-0.05 wt% and 0.5 mol%-2 mol%, respectively. The initial pressure increaseing can effectively shorten the hydration reaction induction time, increase the gas storage density, CO_2 recovery and separation factor. Reducing the temperature can effectively improve the separation efficiency.
引文
[1] 刘妮,赖晓玲,白飞亚.水合物法分离混合气中二氧化碳的实验研究 [J].中国电机工程学报,2017,37(8):2312-2318.
[2] BLOMEN E,HENDRIKS C,NEELE F.Capture technologies:Improvements and promising developments [J].Energy Procedia,2009,1(1):1505-1512.
[3] 张东明,杨晨,周海滨.二氧化碳捕集技术的最新研究进展 [J].环境保护科学,2010,36(5):7-9.
[4] BABU P,LINGA P,KUMAR R,et al.A review of the hydrate based gas separation (HBGS) process forcarbon dioxide pre-combustion capture [J].Energy,2015,85:261-279.
[5] BABU P,KUMAR R,LINGA P.Pre-combustion capture of carbon dioxide in a fixed bed reactor using the clathrate hydrate process [J].Energy,2013,50(2):364-373.
[6] LI L,CONWAY W,BURNS R,et al.Investigation of metal ion additives on the suppression of ammonia loss and CO2,absorption kinetics of aqueous ammonia-based CO2 capture [J].International Journal of Greenhouse Gas Control,2017,56:165-172.
[7] MOGHADAM F,KAMIO E,MATSUYAMA H.High CO2,separation performance of amino acid ionic liquid-based double network ion gel membranes in low CO2,concentration gas mixtures under humid conditions [J].Journal of Membrane Science,2017,525:290-297.
[8] LINGA P,KUMAR R,ENGLEZOS P.The clathrate hydrate process for post and pre-combustion capture of carbon dioxide [J].Journal of Hazardous Materials,2007,149(3):625-629.
[9] KAKATI H,MANDAI A,LAIK S.Effect of SDS/THF on thermodynamic and kinetic properties of formation of hydrate from a mixture of gases (CH4+C2H6+C3H8) for storing gas as hydrate [J].Journal of Energy Chemistry (English version),2016,25(3):409-417.
[10] 臧小亚,梁德青,吴能友.不同浓度TBAB半笼型水合物法分离沼气中CO2过程的研究 [J].高校化学工程学报,2016,30(6):1241-1248.
[11] LINGA P,KUMAR R,ENGLEZOS P.Gas hydrate formation from hydrogen/carbon dioxide and nitrogen/carbon dioxide gas mixtures [J].Chemical Engineering Science,2007,62(16):4268-4276.
[12] LINGA P,ADEYEMO A,ENGLEZOS P.Medium-pressure clathrate hydrate/membrane hybrid process for postcombustion capture of carbon dioxide [J].Environmental Science & Technology,2008,42(1):315-320.
[13] 轩小波,刘妮,李菊,等.影响二氧化碳水合物生成特性的实验研究 [J].天然气化工(C1化学与化工),2011,36(2):10-13.
[14] 孙志高,郭开华,樊栓狮.天然气水合物形成促进技术实验研究 [J].天然气工业,2004,24(12):41-43.
[15] KUMAR A,SAKPAL T,LINGA P,et al.Influence of contact medium and surfactants on carbon dioxide clathrate hydrate kinetics [J].Fuel,2013,105(1):664-671.
[16] ZHANG Y,YANG M,SONG Y,et al.Hydrate phase equilibrium measurements for (THF+SDS+CO2+N2) aqueous solution systems in porous media [J].Fluid Phase Equilibria,2014,370(5):12-18.
[17] VERRETT J,POSTERARO D,SERVIO P.Surfactant effects on methane solubility and mole fraction during hydrate growth [J].Chemical Engineering Science,2012,84(52):80-84.
[18] YANG S H B,BABU P,CHUA S F S,et al.Carbon dioxide hydrate kinetics in porous media with and without salts [J].Applied Energy,2016,162(5):1131-1140.
[19] SMITH J M,NESS H C V.Introduction to chemical engineering thermodynamics [J].Journal of Chemical Education,2005,27(10):e62-e70.
[2] BLOMEN E,HENDRIKS C,NEELE F.Capture technologies:Improvements and promising developments [J].Energy Procedia,2009,1(1):1505-1512.
[3] 张东明,杨晨,周海滨.二氧化碳捕集技术的最新研究进展 [J].环境保护科学,2010,36(5):7-9.
[4] BABU P,LINGA P,KUMAR R,et al.A review of the hydrate based gas separation (HBGS) process forcarbon dioxide pre-combustion capture [J].Energy,2015,85:261-279.
[5] BABU P,KUMAR R,LINGA P.Pre-combustion capture of carbon dioxide in a fixed bed reactor using the clathrate hydrate process [J].Energy,2013,50(2):364-373.
[6] LI L,CONWAY W,BURNS R,et al.Investigation of metal ion additives on the suppression of ammonia loss and CO2,absorption kinetics of aqueous ammonia-based CO2 capture [J].International Journal of Greenhouse Gas Control,2017,56:165-172.
[7] MOGHADAM F,KAMIO E,MATSUYAMA H.High CO2,separation performance of amino acid ionic liquid-based double network ion gel membranes in low CO2,concentration gas mixtures under humid conditions [J].Journal of Membrane Science,2017,525:290-297.
[8] LINGA P,KUMAR R,ENGLEZOS P.The clathrate hydrate process for post and pre-combustion capture of carbon dioxide [J].Journal of Hazardous Materials,2007,149(3):625-629.
[9] KAKATI H,MANDAI A,LAIK S.Effect of SDS/THF on thermodynamic and kinetic properties of formation of hydrate from a mixture of gases (CH4+C2H6+C3H8) for storing gas as hydrate [J].Journal of Energy Chemistry (English version),2016,25(3):409-417.
[10] 臧小亚,梁德青,吴能友.不同浓度TBAB半笼型水合物法分离沼气中CO2过程的研究 [J].高校化学工程学报,2016,30(6):1241-1248.
[11] LINGA P,KUMAR R,ENGLEZOS P.Gas hydrate formation from hydrogen/carbon dioxide and nitrogen/carbon dioxide gas mixtures [J].Chemical Engineering Science,2007,62(16):4268-4276.
[12] LINGA P,ADEYEMO A,ENGLEZOS P.Medium-pressure clathrate hydrate/membrane hybrid process for postcombustion capture of carbon dioxide [J].Environmental Science & Technology,2008,42(1):315-320.
[13] 轩小波,刘妮,李菊,等.影响二氧化碳水合物生成特性的实验研究 [J].天然气化工(C1化学与化工),2011,36(2):10-13.
[14] 孙志高,郭开华,樊栓狮.天然气水合物形成促进技术实验研究 [J].天然气工业,2004,24(12):41-43.
[15] KUMAR A,SAKPAL T,LINGA P,et al.Influence of contact medium and surfactants on carbon dioxide clathrate hydrate kinetics [J].Fuel,2013,105(1):664-671.
[16] ZHANG Y,YANG M,SONG Y,et al.Hydrate phase equilibrium measurements for (THF+SDS+CO2+N2) aqueous solution systems in porous media [J].Fluid Phase Equilibria,2014,370(5):12-18.
[17] VERRETT J,POSTERARO D,SERVIO P.Surfactant effects on methane solubility and mole fraction during hydrate growth [J].Chemical Engineering Science,2012,84(52):80-84.
[18] YANG S H B,BABU P,CHUA S F S,et al.Carbon dioxide hydrate kinetics in porous media with and without salts [J].Applied Energy,2016,162(5):1131-1140.
[19] SMITH J M,NESS H C V.Introduction to chemical engineering thermodynamics [J].Journal of Chemical Education,2005,27(10):e62-e70.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |