基于双节流装置的湿气测量方法  

Wet Gas Measurement Based on Dual-throttle Device

作　　者：徐英[1,2] 袁超[1,2] 龙征海[3] 张强[1,2] 李振林 张涛[1,2] 

机构地区：[1]天津市过程检测与控制重点实验室天津300072 [2]天津大学电气与自动化工程学院天津300072 [3]中国石油西南油气田分公司川中油气矿成都610000 [4]天大泰和自控仪表技术有限公司天津3000721

出　　处：《机械工程学报》2012年第22期139-147,共9页Journal of Mechanical Engineering

基　　金：国家自然科学基金(60974118);国家高技术研究发展计划(863计划,2007AA04Z180)资助项目

摘　　要：湿气作为一种石油天然气行业经常出现的流体,对于湿气的准确测量具有重要的意义。目前常用的方法是在气液分离之后采用单相仪表进行计量,而这种方法成本较高,因此为实现湿气的气液两相在线不分离测量,设计一种基于类内锥和长喉径类文丘里组合的双节流湿气流量测量装置,提出一种基于三级差压信号的测量方法,引入差压信号的比值作为建模的关键参数。同时建立并比较研究此双节流装置的4套湿气测量模型在实验室和现场的表现。经实验室验证,平均气相测量精度为2.13%,平均液相测量精度6.68%。现场性能测试结果表明未经修正的测量模型平均气相测量误差为7.87%,平均液相误差为15.96%,经二次修正后可实现平均气相测量误差优于±3%,液相测量满度误差优于±10%。Wet gas always occurs in oil and natural gas industry, so the accurate measurement of wet gas is of great significant. At present, make use of single phase meter after gas-liquid separator is the common method in wet gas measurement, but this method has a higher cost. So in order to meter the wet gas without separation online, a novel measurement device composed of a long throat Venturi tube and a V-cone is proposed and a new metering method based on triple differential pressures is put forward. In this method, the ratios of the differential pressures are vital parameters used to establish the measurement correlations. The comparisons of these correlations in laboratory and fields are also presented. In laboratory test, the measurement accuracy of the gas and liquid are 2.13% and 6.68% respectively. Field performance test results show that the relative error of gas flow rates is 7.87%, and the full scale error of liquid flow rates is 15.96% before the correction, and after field correction the average relative error of the gas metering is less than ±3%, the full-scale errors of the liquid metering is less than ±10%.

关 键 词：内锥 文丘里 双节流装置 三级差压 虚高模型 比值法 

分 类 号：TH814[机械工程—仪器科学与技术]