火电厂石灰-石膏法烟气脱硫系统所用pH计及密度计的取样探头易结垢、磨损,测量管路堵塞频繁,导致脱硫塔装液pH值和密度的测量出现偏差甚至数据失真.为此,设计了改进型pH计取样装置,并采用隔膜压力变送器代替传统密度计.结合山西大土河焦化有限责任公司热电一分厂3×75t/h循环流化床锅炉烟气脱硫工程,介绍二者的使用原理及应用情况.实践结果表明,改进型pH计取样装置可有效保护取样探头,具有较好的实用性和经济性；隔膜压力变送器具有监测脱硫塔内浆液密度和液位的双重功能,且维护工作量小,更符合工程应用的需求.%Scaling and wearing tend to happen on the sarnpling probe of pH meters and density meters used in lime-gypsum FGD system of thennal power plants,which leads to frequent clogging in the measuring pipeline and deviation, even distortion in pH value and density measurement for the desulfurization tower slurry.Therefore, an improved pM sampling device is designed, adopting the diaphragm pressure transmitter instead of the traditional densimeter. Combined with the FGD project for three 75-1/h circulating fluidized bed boilcrs in the No. 1 combined heat and power plant for Shanxi Datuhe Coking and Chemical Co Ltd., the principle and application of the design is introduced,The experimental results show that the improved pH sampling device can effectively protcct the samplig probe with better practicability and economics. The diaphragm pressure transmitter also has dual functions, I.e., mnnitoring the densily and liquid level of the slurry in the desulfurization tower, which requires less maintenance work and is more suitable for engineering upplication.
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