基于在线pH测量中温度补偿影响的实例分析与探讨  

Case analysis and discussion on the influence of temperature compensation in onlinepHmeasurement

作　　者：田利 程阳[2] 王艳芬 戴鑫 陈丰[2] 张龙明 付清敏 陈裕忠 TIAN Li;CHENG Yang;WANG Yanfen;DAI Xin;CHEN Feng;ZHANG Longming;FU Qingmin;CHEN Yuzhong(Zhejiang TPRI-LH Intelligent Sensing Technology Co.,Ltd.,Jiaxing 314000,China;Huaneng Power Intl Inc.,Beijing 100031,China;Baotou Branch of Inner Mongolia Special Equipment Inspection and Research Institute.Baotou 014030,China;Guangdong Yuedian Yunhe Power Generation Co.,Ltd.,YunFu 527300,China;Huaneng Haimen Power Plant,Shantou 515132,China)

机构地区：[1]浙江西热利华智能传感技术有限公司,浙江嘉兴314000 [2]华能国际电力股份有限公司,北京100031 [3]内蒙古自治区特种设备检验研究院包头分院,内蒙古包头014030 [4]广东粤电云河发电有限公司,广东云浮527300 [5]华能海门电厂,广东汕头515132

出　　处：《热力发电》2023年第9期190-194,共5页Thermal Power Generation

基　　金：中国华能集团有限公司总部科技项目(HNKJ21-HF305)。

摘　　要：某电站锅炉给水、蒸汽、炉水等测点的pH值持续异常偏低,且无法通过调整炉水加药工艺得到有效解决。为此,探讨分析了水样温度对pH电极、能斯特温度系数斜率以及溶液温度系数(离子活度)的影响情况,并通过试验验证了pH测量值异常偏低是由于水样温度偏离25℃较大,而pH测量手段无法提供正确的温度补偿造成的。提出通过严格控制水样温度、采用计算型pH仪表或选择有精密非线性温度补偿功能的高精度pH表等手段,可有效解决该机组水汽系统pH测量异常偏低的问题。The pH values of boiler feed water,steam,boiler water and other measuring points in a chemical power plant were abnormally low,and the problem could not be effectively solved by adjusting the boiler water dosing process.In order to solve this problem and ensure the safe operation of the unit,this paper discusses and analyzes the influence of water sample temperature on pH electrode,Nernst temperature coefficient slope and solution temperature coefficient(ionic activity),and verifies through experiments that the abnormally low pH measurement value is caused by the large deviation of water sample temperature from 25 C,and the pH measurement method cannot provide correct temperature compensation.Strict control of water sample temperature,adoption of computational pH meter or selection of high-precision pH meter with precise non-linear temperature compensation function can effectively solve the problem of abnormally low pH measurement in the water and steam system.

关 键 词：PH 在线测量 异常 温度补偿 

分 类 号：TM621.2[电气工程—电力系统及自动化]