四种天然气水含量分析方法的对比研究

Comparison of four analytical methods of water content in natural gas

关键词:  天然气  水含量  测定  对比研究  操作要点

Key words:  natural gas  water content  determination  comparison research  operation points

摘要:

激光法、电容法、光纤法和石英晶体振荡法4种测定气体中水含量的分析方法,因操作维护简单,在天然气行业有较大的推广价值,国内即将实施采用这4种方法测定天然气中水含量的分析标准。为了指导方法使用者正确操作,通过实验对比研究了这4种方法的操作特点,包括:影响方法准确性的因素、稳定性以及检测速度。研究结果表明:影响方法准确性的因素主要有测试温度、压力与气体流量等,光纤法的准确性还与CO2含量有关;电容法的稳定性较差,需要频繁校准;测量时间不充分会产生不准确的测量结果,应根据这些方法各自的检测速度分别确定其合适的测量时间。

Abstract:

The four analytical methods of water content determination in natural gas,such as Laser method,capacitance method,fiber-optic method and quartz-crystal oscillation method,are worth promoting in natural gas industry due to simple operation and maintenance.These methods are about to be implemented as the standard to determine water content in natural gas in China.In order to guide the user of those methods to operate correctly,the comparison research about the operation characteristics of the four methods are taken by experiment.The research content includes the factors of affect method accuracy,stability,and detecting speed.The research results show that the main factors affecting method accuracy are test temperature,pressure and gas flow,etc.,and the accuracy of the fiber-optic method is also related to the carbon dioxide content.The capacitance method is poor in stability,so it needs for frequent calibration.As inadequate measurement time will produce inaccurate measurement results,the appropriate measurement time of these methods should be determined by respective detecting speed.