中国、ISO和俄罗斯天然气水露点测定标准方法比对

Comparative study of standard methods of China, ISO and Russia for determining water dew point of natural gas

关键词:  天然气  水露点  标准  国际标准化组织  俄罗斯

Key words:  natural gas  water dew point  standard  international standardization organization  Russia

摘要:

水露点是天然气质量控制和管道安全运行的重要指标,也是进口俄罗斯天然气技术协议谈判中重点关注的指标。对中国、ISO和俄罗斯三方的天然气水露点测定标准方法开展了详细的比对,首先是标准文本的比对,其次是采用标准水露点发生器生成的气源,在实验室开展比对,最后是依据中国和俄罗斯两国标准,分别采用两国常用的水露点分析仪,在两国标准规定的不同吹扫条件下,在输气站现场开展了比对。通过比对,明确了三方标准最大的区别是吹扫方式；在无干扰情况下,中国和俄罗斯常用水露点分析仪检测结果准确可靠且相互吻合良好；在存在干扰情况下(可能是醇类或烃类),中国和俄罗斯常用水露点分析仪检测结果差异较大,最大差值达到6.1 ℃。比对结果为进口俄罗斯天然气技术谈判提供了支撑。 

Abstract:

Water dew point is an important indicator of natural gas quality control and pipelines safe operation, and also a key concern indicator in negotiation of technical agreement for importing Russian natural gas. The paper makes a detailed comparative study on the standard methods of China, ISO and Russia for determining water dew point of natural gas. Firstly, it is the comparison of standard content. Secondly, comparative test was carried out in different laboratories by using the gas source generated by the standard water dew point generator. Finally, according to the standards of China and Russia, the dew point instruments commonly used in the two countries are respectively used to carry out comparative tests at gas transmission stations under different blowing conditions. Through comparative study, it is clear that the biggest difference between the three standards is the blowing mode; in the condition of no interference, the test results of the common water dew point instrument in China and Russia are accurate, reliable and in good agreement with each other; in the presence of interference (possibly alcohols or hydrocarbons), the test results are quite different, the maximum difference is 6.1 ℃. This study provides a support for the technology negotiations of importing Russian natural gas.