Fouling Performance Monitoring Based On The Temperature And Pressure Signals Of Heat Exchanger

The heat exchange device in which scaling exists generally plays an importantrole in energy application system. Fouling could not only lead to the degradation of heattransfer performance of heat exchanger, but also affect the flow performance of heatexchanger which result in serious energy loss. In order to utilize heat exchangereffectively and remove the dirt and upgrade the device timely, a method, which involvesless investment and high precision and is also easy to implement, to achieve onlinemonitor and diagnose on scaling and its degree by only monitoring the temperature andpressure is show in the paper. The paper involves:This paper analyzes the change of heat exchange performance results from the dirtin heat exchanger, the effect on heat transfer coefficient and flow resistance from thedirt and proposes a method of monitoring and diagnosing the scaling degree in heatexchanger by only monitoring temperature and pressure.This paper propose the temperature difference compare method in which the flowtemperature differences between the inlet and outlet on paradise condition and actualcondition are compared to test the heat exchanger dirt performance on the condition ofsame pressure difference. The specific monitoring algorithm and implementationprogram of the temperature difference compare method are introduced. In order toimprove the accuracy of monitoring, the sensitivity analysis and error analysis of themonitored parameters and the accuracy requirements and data processing methods ofthe monitoring instruments in actual application are proposed.The pressure drop compare method in which the flow pressure drop between theinlet and outlet on paradise condition and actual condition are compared to test the heatexchanger dirt performance on the condition of same inlet temperature and the sameoutlet temperature of the temperature is shown in the paper. By testing the steam-waterplate heat exchanger in some plant and analyzing the dates, the two methods are provedto be feasible.Without monitoring the flow of heat exchanger, the temperature differencecompare method and the pressure drop compare method which involve thecharacteristic of less investment, high accuracy, simple implementation and highreliable are also applicable to heat exchangers of other forms.