电接点水位计测量误差的特点  

The Features of Measuring Error of Electric Contact Water Level Meter

作　　者：刘元胜 刘天顺 薛智 

机构地区：[1]广东省珠海发电厂有限公司,珠海519015 [2]江西省电力试验研究所,南昌330006 [3]珠海发电厂,珠海519015

出　　处：《自动化仪表》2002年第4期15-18,共4页Process Automation Instrumentation

基　　金：.NULL.

摘　　要：从电接点水位计的结构特点和测量筒内的动力学特性出发 ,分析了电接点水位计测量误差的特点 ,得到测量筒内次冷水的温度分布 ,并确认测量筒内的平均温度降几乎是常数 ,它只与连接管的保温、倾斜度有关 ,而与汽包压力无关。最后 ,以 70 0MW机组为例 ,计算出不同汽包压力下水位的显示误差值 ,以说明电接点水位计只能“准确”测量一种工况下的汽包水位。From the features of structure of electric contact water level meter and the dynamics characteris tic in the measuring tube the features o f measuring error of electric contact wa ter level meter are analyzed, thus the t emperature distribution of secondary coo ling water is obtained. It is confirmed that the average temperature drop in mea suring pail is almost constant. It is on ly related to the heat conservation and the tilt of the connection tube, while n ot related to the drum pressure. Finally with a 700MW power unit as example the display error of the water level under different drum pressure is calculated, a nd the fact of electric contact water le vel meter can only measure drum water le vel under one operation status is stated

关 键 词：电接点水位计 测量误差 液位测量 汽包 锅炉 

分 类 号：TK223.67[动力工程及工程热物理—动力机械及工程] TH816[机械工程—仪器科学与技术]