提高孔板流量计测量精确度的研究  

Study on Orifice Plate Flow-meter Measurement Accuracy Improvement

作　　者：张宝良[1] 张恩科 纪波峰 纪纲 

机构地区：[1]中国石化股份有限公司天津分公司,天津300271 [2]营口港务股份公司第四分公司,辽宁营口115007 [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》2017年第4期48-51,共4页Automation in Petro-chemical Industry

摘　　要：介绍了新老标准中关于标准差压流量计测量精确度问题的演变,1981年以前,提高测量精确度需采用设置较大的界限雷诺数及压缩量程比的方法来实现,且将原本非线性的流出系数C当作常数来处理。1993年以后随着仪表技术的发展,能够实现对C的非线性进行自动校正,建立了C的模型,并可将流量测量量程比扩大到10倍,系统不确定度提高到1.0%。重点探讨了量程比的变化对测量精确度的影响。The problem development on standard pressure differential flow meter measuring accuracy in the previous and current version standard is introduced, method of setting large limit Reynolds and compression range ratio is applied. To improve measurement accuracy before 1981, and the original nonlinear flow coefficient C is treated as a constant. With the development of instrument technology, automatic correction of flow coefficient nonlinear can be achieved after 1993. The model of C is constructed. The flow range ratio can be enlarged to 10 times its single range. System uncertainty is improved to 1.0%. The influence of range ratio to measurement accuracy is expounded with emphasis.

关 键 词：标准孔板 量程比界限 雷诺数流出系数 非线性雷诺数补偿 

分 类 号：TH814.5[机械工程—仪器科学与技术]