驱动压力影响下不同体系煤层气水合分离实验  

Experimental study on coalbed methane hydrate separation in different systems under driving pressures

作　　者：王世海 吴强 李忠辉[1] 陈勇 赵子琪 WANG Shihai;WU Qiang;LI Zhonghui;CHEN Yong;ZHAO Ziqi(School of Safety Engineering,China University of Mining&Technology,Xuzhou 221116,Jiangsu,China;Shenzhen Investment Holdings Co.,Ltd.,Shenzhen 518000,Guangdong,China;School of Safety Engineering,Heilongjiang University of Science and Technology,Harbin 150022,Heilongjiang,China;Shenzhen Urban Public Safety and Technology Institute,Shenzhen 518046,Guangdong,China)

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116 [2]深圳市投资控股有限公司,广东深圳518000 [3]黑龙江科技大学安全工程学院,黑龙江哈尔滨150022 [4]深圳市城市公共安全技术研究院,广东深圳518046

出　　处：《低碳化学与化工》2024年第10期136-142,共7页Low-Carbon Chemistry and Chemical Engineering

基　　金：黑龙江省省属本科高校科研创新平台建设项目(2022-KYYWF-0531)。

摘　　要：煤层气(CBM)分离提纯对保障矿井安全生产、实现双碳目标等具有重要意义。基于水合物法分离技术,在十二烷基硫酸钠(SDS)、油水乳液和纯水体系中施加4种驱动压力(1 MPa、2 MPa、3 MPa和4 MPa),开展了高浓度煤层气(甲烷体积分数60%)水合分离实验。结果表明,3种体系中煤层气水合物的生长速率均随驱动压力的增大而持续增大,添加SDS和油水乳液能进一步增大水合物生长速率。不同驱动压力下,煤层气经纯水体系、SDS体系和油水体系分离后,甲烷回收率分别为10.02%~11.75%、31.00%~43.36%和21.68%~24.36%,其中SDS体系较纯水体系甲烷回收率增大了3~4倍,油水体系则增大了约2倍。3种体系中甲烷回收率均随驱动压力增大而增大,但驱动压力为3~4 MPa时,SDS和油水乳液体系的分离因子呈下降趋势,分离难度变大,可见3 MPa为最佳驱动压力,此时煤层气经SDS和油水乳液体系提纯后,甲烷体积分数分别达到81.13%和82.32%。The separation and purification of coalbed methane(CBM)are crucial for ensuring safe production in mines and achieving carbon neutrality goals.Using hydrate separation technology,experiments were conducted to separate high-concentration CBM(with methane volume fraction of 60%)in sodium dodecyl sulfate(SDS),oil-water emulsion and pure water systems under four different driving pressures(1 MPa,2 MPa,3 MPa and 4 MPa).The results indicate that the growth rate of CBM hydrate increases continuously with the driving pressure in all three systems.The addition of SDS and oil-water emulsion further increases the hydrate growth rate.Under different driving pressures,the methane recovery rates after separation in pure water,SDS and oil-water systems are 10.02%to 11.75%,31.00%to 43.36%and 21.68%to 24.36%,respectively.Compared to the pure water system,the methane recovery rate is 3 to 4 times higher in the SDS system and approximately 2 times higher in the oil-water emulsion system.The methane recovery rate increase with the driving pressure in all three systems.However,the separation factors of SDS and oil-water emulsion systems decrease at driving pressures of 3 to 4 MPa,indicating increased separation difficulty.Therefore,3 MPa is identified as the optimal driving pressure.At this pressure,the methane volume fraction after purification in the SDS and oil-water emulsion systems reach 81.13%and 82.32%,respectively.

关 键 词：煤层气水合物 水合分离 驱动压力 十二烷基硫酸钠 油水乳液 

分 类 号：TQ028[化学工程] TE37[石油与天然气工程—油气田开发工程]