蒸汽状态给蒸汽流量计量带来的误差  

Errors Caused by Vapor State in Steam Flow Measurement

作　　者：郑建英[1] 陈超洋[1] 马龙博[1] 朱云[2] 郑恩辉[2] 

机构地区：[1]浙江省计量科学研究院,浙江杭州310013 [2]中国计量学院机电工程学院,浙江杭州310018

出　　处：《自动化仪表》2009年第7期31-32,共2页Process Automation Instrumentation

基　　金：浙江省公益技术攻关基金资助项目(编号:2008F10G5200006)

摘　　要：结合差压式流量计和涡街流量计的数学模型,对安装过程中由于蒸汽状态选择不当所造成的蒸汽流量计量误差进行了详细的分析。指出了蒸汽密度补偿模式与蒸汽状态直接相关,蒸汽状态的错误判定会给蒸汽计量带来较大的误差。压力越低、温度越高,由此带来的误差就越大。提出了蒸汽流量计安装中正确判定蒸汽状态的必要性。In accordance with the mathematical models of D/P flowmeter and vortex shedding flowmeter, the errors caused by improperly selecting vapor state for steam flow measurement in installation are analyzed respectively. It is proposed that the compensation model of vapor density is directly related to vapor state, and inaccurate determination of vapor state will bring very big error to steam flow measurement; the lower pressure and higher temperature, the bigger error. The necessity of accurate determination of vapor state in instaUation of the flowmeter is put forward.

关 键 词：差压式流量计 涡街流量计 蒸汽状态 误差密度补偿 

分 类 号：TH814[机械工程—仪器科学与技术]