在线气相色谱仪间接法测量天然气热值的不确定度评估
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摘要
随着能量计量方式不断被提出,间接法测量天然气热值成为能量计量过程中必不可少的步骤。在天然气场站中大多选用在线气相色谱仪对管道天然气组成进行持续分析检测,并通过GB/T 11062——2014规定的计算方法来间接测量天然气的发热量,这也是最快速可行的方法。以济南输气站在线气相色谱仪为研究对象,结合间接法测量天然气热值的过程,对过程中存在的每一个能对最终结果造成影响的因素进行分析探讨,并按照不确定度传递原则,对最终结果的不确定度进行评估,最终该文中天然气热值测量结果的相对扩展不确定度为0.88%(k=2),对应于热值的不确定度为0.34 MJ/m~3。
As the energy measurement methods have been put forward,the indirect method of measuring gas calorific value is becoming essential steps in the process of energy metering. The on-line gas chromatograph( GC) is used to continuously analyze the natural gas composition and measure the calorific value of natural gas indirectly through the calculation method specified in GB/T 11062-2014 in the most of the natural gas stations. This is also the fastest and feasible method. Therefore,the GC of Jinan station is taken as research objec,and the process of measuring the calorific value of natural gas is analyzed. The factors that can influence the results in the process are analyzed and discussed according to the uncertainty principle. The relative expanded uncertainty of the results is 0. 88%( k = 2),and the uncertainty of the calorific value is 0. 34 MJ/m~3.
As the energy measurement methods have been put forward,the indirect method of measuring gas calorific value is becoming essential steps in the process of energy metering. The on-line gas chromatograph( GC) is used to continuously analyze the natural gas composition and measure the calorific value of natural gas indirectly through the calculation method specified in GB/T 11062-2014 in the most of the natural gas stations. This is also the fastest and feasible method. Therefore,the GC of Jinan station is taken as research objec,and the process of measuring the calorific value of natural gas is analyzed. The factors that can influence the results in the process are analyzed and discussed according to the uncertainty principle. The relative expanded uncertainty of the results is 0. 88%( k = 2),and the uncertainty of the calorific value is 0. 34 MJ/m~3.
引文
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[10]裴全斌,夏宝丁,邹伟,等.利用实验室内部比对进行气相色谱仪质量控制[J].计量技术,2015(11):40-43
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[13]林敏,庞小坤,夏宝丁,等.天然气组分含量分析的不确定度评定[J].云南化工,2013,40(3):58-61.
[14]蔡黎,唐蒙,迟永杰.天然气发热量间接测量不确定度评估方法初探[J].石油与天然气化工,2015(2):101-104.
[2]天然气发热量、密度、相对密度和沃泊指数的计算方法:GB/T 11062-2014[S].北京:中国质检出版社,2014.
[3]天然气的组成分析气相色谱法:GB/T 13610-2014[S].北京:中国质检出版社,2014.
[4]陈赓良.天然气的能量计量及其标准化[J].石油工业技术监督,2001,17(5):1-7.
[5]陈赓良,罗勤.天然气分析的溯源性与标准气混合物[J].石油工业技术监督,2004,20(11):10-12.
[6]裴全斌,夏宝丁,沈超,等.在线气相色谱仪标准装置的建立[J].中国计量,2014(11):77-79.
[7]孙丽敏.浅析气相色谱仪计量标准的重复性试验[J].化学分析计量,2016,25(1):70-72.
[8]曾文平,王晓琴,王伟杰.天然气在线气相色谱仪校准规范的制定[J].石油与天然气化工,2017,46(3):99-103.
[9]金美兰,赵建南.气相色谱仪检定装置不确定度评定[J].中国计量,2003(11):62-63.
[10]裴全斌,夏宝丁,邹伟,等.利用实验室内部比对进行气相色谱仪质量控制[J].计量技术,2015(11):40-43
[11]陈福权,裴全斌,张玮健,等.气相色谱仪分析天然气组成的不确定度评定[J].计量与测试技术,2011,38(10):82-84.
[12]周湄生,李诗铁.气相色谱仪测量结果不确定度的探讨[J].计量技术,2004(10):49-50.
[13]林敏,庞小坤,夏宝丁,等.天然气组分含量分析的不确定度评定[J].云南化工,2013,40(3):58-61.
[14]蔡黎,唐蒙,迟永杰.天然气发热量间接测量不确定度评估方法初探[J].石油与天然气化工,2015(2):101-104.