气体的膨胀性对流量测量的影响及对策研究  

Study on Impact and Countermeasure of Gas Expansibility on Flow Measurement

作　　者：孙江平[1] 戴铮[1] 蔡方明[2] 纪纲 纪波峰 Sun jiangping;Dai zheng;Cai fangming;Ji gang;Ji bofeng(Shanghai Aircraft Design and Research Institute,Shanghai,201210,China;Spirax Sarco Engineering(China)Co.Ltd.,Shanghai,201114,China;Shanghii Tontion Automation Instrumentation Co.Ltd.,Shanghai,200070,China)

机构地区：[1]上海飞机设计研究院,上海201210 [2]斯派莎克工程(中国)有限公司,上海201114 [3]上海同欣自动化仪表有限公司,上海200070

出　　处：《石油化工自动化》2018年第5期58-61,共4页Automation in Petro-chemical Industry

摘　　要：流体流过流量计后,都会产生一定的压力降,因而引起出口静压降低。当被测流体为含水蒸气的气体时,由于气体的膨胀性,静压降低会导致气体流束膨胀,从而会引起流量测量产生误差。分析了气体膨胀对标准孔板流量计、喷嘴流量计、线性孔板流量计、V锥流量计、浮子流量计、涡街流量计流量测量的影响,并给出了在流量二次装置中实现可膨胀性系数的自动补偿方法。A certain pressure drop will be produced after fluid passes through flowmeter,and static pressure decrease will be caused at flowmeter outlet.When the measuring fluid is gas with steam,the static pressure decrease will result in gas volume expansion due to the expansion of gas,and will cause flow measurement error.The impact of gas expansion to orifice flowmeter,nozzle flowmeter,linear orifice flowmeter,V cone flowmeter,float lowmeter and vortex lowmeter is investigated.Realizing an auto-compensation o expansibility factor for flow in secondary device is provided.

关 键 词：流量测量 气体膨胀 可膨胀性系数 自动补偿 内锥流量计 

分 类 号：TH814[机械工程—仪器科学与技术]