水合物法天然气脱酸的影响因素  

Influence Factors of Hydrate-Based Separation for Natural Gas Deacidification

作　　者：唐建峰 曾大龙 王传磊 陈玉亮 何利民 付浩 

机构地区：[1]中国石油大学储运与建筑工程学院,山东青岛266580 [2]中国石油西气东输管道分公司,上海200122

出　　处：《石油学报（石油加工）》2012年第6期950-956,共7页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：山东省自然科学基金(ZR2009FM036);中央高校基本科研业务费专项资金(10CX04012A);中央高校基本科研业务费专项资金(11CX06080A)项目资助

摘　　要：为了促进水合物法分离CO2在天然气脱酸工艺中的应用,以CH4+CO2混合气为例,采用CO2分离率、CH4损失率及分离因子作为水合物法脱酸的评价指标,利用自主设计的水合物法气体分离实验装置考察了初始压力、操作温度、四氢呋喃(THF)及实验用水量对水合物法分离CH4+CO2混合气的影响。结果表明,随初始压力增大和操作温度降低,平衡时气相CO2浓度降低,CO2分离率和CH4损失率同时增大,分离因子小幅减小;随THF浓度增大,平衡时气相CO2浓度增加,在THF摩尔分数为1.0%时,体系具有较大的CO2分离率和分离因子,较低的CH4损失率;随实验用水量增加,平衡时气相CO2浓度降低,CO2分离率增大,CH4损失率减小,分离因子增大。综合分析,可通过提高初始压力、降低操作温度、增加实验用水量,并添加摩尔分数1.0%THF来促进水合物生成,提高分离效率。In order to improve the performance of conventional natural gas deacidification technology and facilitate the application of hydrate-based gas separation in CO2 capture, taking CH4 q-CO2 mixture for acid natural gas substitute, the effects of initial system pressure, temperature, tetrahydrofuran （THF） concentration and water volume on hydrate-based separation efficiency were studied systematically through comprehensive experiments, which were evaluated by CO2 split fraction, CH4 loss fraction and separation factor as a whole. The results showed that, with the increase of initial pressure and decrease of operational temperature, the equilibrium CO2 concentration in gas phase decreased, but CO2 split fraction and CH4 loss fraction increased simultaneously, resulting in separation factor decreased slightly. With THF enriched in solution, the equilibrium CO2 concentration in gas phase increased. When THF mole fraction reached 1.0 G, split fraction and separation factor could get more satisfied values along with lower loss fraction. More water volume in system could not only increase split fraction but also decrease loss fraction, resulting in separation factor increased. It is concluded that the natural gas deacidification based on hydrate-based separation can be improved though higher initial pressure, lower temperature, 1.0 mole fraction of THF added and adequate water volume.

关 键 词：水合物法气体分离 天然气脱酸 分离效率 四氢呋喃 

分 类 号：TQ028[化学工程]