微量氢气定量富集方法初探

Primary study on relatively preconcentration of trace hydrogen in natural gas

孟庆强 陶成 朱东亚 金之钧 王强 郑伦举

Meng Qingqiang Tao Cheng Zhu Dongya Jin Zhijun Wang Qiang Zheng Lunju

中国石油化工股份有限公司石油勘探开发研究院博士后科研工作站, 北京100083 2. 中国地质大学(北京)能源学院, 北京100083 3. 中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所, 江苏无锡214151

Postdoctoral Working Station, Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China 2. Energy College, China University of Geosciences, Beijing 100083, China 3. Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China

针对天然气中的微量氢气同位素组成测试难题,该文提出了一种微量氢气定量富集方法。该方法利用天然气组分的物理化学性质差异,采用冷阱和真空技术,通过定量注入He的方法,将沸点较高的气体组分进行液化,实现微量氢气的相对富集,并通过计算加入的样品气体的量与注入系统的He的体积比计算氢气相对富集的倍数。根据该方法的要求,设计、加工了相关设备,并利用实验室内标H2与CH4配制了低氢气含量的混合气体。测试结果表明,利用该方法,能成功对微量氢气实现相对富集,处理后氢气同位素组成测试值的误差约为±5‰,可能为该方法的系统误差,但尚需确认;测试结果相对稳定。

A new quantitative preconcentration method for trace hydrogen in natural gas was proposed in this paper so as to deal with the problem of isotopic composition measurement.Based on the differences of chemical and physical properties between different components in natural gas,using cryogenetic trap and vacuum techniques,helium was injected to liquefy the gas components with higher boiling point.In this way,trace hydrogen was concentrated and the concentration degree was calculated.A correspon-ding equipment was designed and produced.Experiments with the mixed gas of standard H2 and CH4 as well as trace hydrogen were carried out.It has been proved that,the new method is qualified to concentrate trace hydrogen.The testing error is about ±5‰.It might be a system error,but still remains confirmation.

中国博士后科学基金(20100470500)资助

https://doi.org/10.11781/sysydz201103314