【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CO₂的影响,用摩尔分数为25%的CO₂和75%的N₂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CO₂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,CO₂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,CO₂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、CO₂回收率和分离因子,降低温度能有效提高分离效果。更多还原

【Abstract】 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 CO₂ captured from simulated flue gas by hydrate based gas separation（HBGS）. Mixed gas contained CO₂ with a mole fraction of 25% and N₂ 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 CO₂ 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 CO₂ 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 CO₂ 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, CO₂ recovery and separation factor. Reducing the temperature can effectively improve the separation efficiency.更多还原