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石油与天然气化工
CHEMICAL ENGINEERING OF OIL GAS
0.1mg感量质量比较仪对标准气体
称量不确定度的影响研究
蔡黎1-2张露露12唐蒙1.2
1.中国石油西南油气用公司天然气研究院2.中国石油天然气质量控制和能量计量重点实验室
2017
摘要通过对0.1m感量的标准气体称量设备进行称量过程的不确定度来源进行探讨和量化,并使用标准方法进行称量结果不确定度的评估,得出使用0.1m感量质量比较仪进行标准气体称量时,单次称量的不确定度约为0.2m。通过称样量的控制,最终获取的标准气体不确定度的原主要贡献源称量不确定度进一步降低,影响低于原料气纯度不确定度,甚至各组分摩尔质量的不确定度。使用0.1m感量的标准气体称量设备进行标准气体称量时,标准气体的标准合成称量不确定度可低于 0.02%以下。
关键词0.1m标准气体质量比较仪称量法不确定度
中图分类号:TE648
文献标志码:A
D0I:10.3969/i.issn.1007-3426.2017.05.018
Studyontheinfluenceofo.1mgsensitivitymasscomparatoronthe
uncertainty of reference gas prepared by gravimetric method
Cai Li' -2, Zhang Lulu'-, Tang Meng' 2
1. Research Institute of Natural Gas Technology , PetroChina Southaest Oil & Gasfield Company Chengdu, Sichuan, China; 2. Key Laboratory of Natural Gas Quality and Energy Measurement,
CNPC, Chengdu, Sichuan, China
Abstract : The uncertainty source during the gravimetric procedure caused by the application of O .1 mg sensitivity mass comparator is discussed and evaluated according to standard procedure . The uncertainty of one single weighing procedure is O.2 mg by using O.l mg sensitivity mass comparator . By enlarge the filling amount of the component, the former main contribution (uncertainty of weighing) of the obtained reference gas become lower than other uncertainty sources such as the uncertainty of purity , even the uncertainty of mass molecular . The standard uncertainty of reference gas could be less than 0.02% while the reference gas is prepared by 0.1 mg sensitivity mass comparator.
Key words : O.l mg, reference gas, mass comparator, gravimetric method, uncertainty
气体分析是气体行业质量控制和生产过程中进行
过程控制的数据来源,现有的天然气计量和质量体系均是基于天然气的组成数据建立起来的1-2]。比如天
然气质量参数发热量,天然气计量参数压缩因子等都是通过分析天然气组成进行计算的方法获取。而要获取准确的气体组成数据,各种分析均要使用气体标准
作者简仓蓄翟(1983一),男,现就职于中国石油西南油气田公司天然气研究院,主要从事天然气分析用标准物质和非常规天然气气质方面研括E-mail:cai_1@petrochina.com.cn