Thermocouple temperature monitoring method and system for air preheater

Abstract

This invention relates to a measuring method and system for air temperature of preheater couple. The method is as following: to fix eleven exclusive heat electric thermocouple probes according to the size and direction of the radius of preheater in the air outlets on A, B side of the preheater; and to fix two exclusive electric thermocouple probes in the air inlet and to fix two exclusive electric thermocouple probes in gas inlet and to fix hoop approach switch and inductive slice in rotary axis of preheater. The whole apparatus can be operated with electricity, setting the temperature of temperature controller in control cabinet. Then to calculate the temperature of air inlet, gas inlet and air outlet through the program control and thus get a group of values of temperature efficiency of preheater. The temperature around inner points of the preheater can be read on the touch display.

Description

technical field [0001] The invention relates to an air preheater thermocouple temperature monitoring method and system, which are used for monitoring the air preheater thermocouple temperature of a large-scale thermal power generating set boiler, and belong to the technical field of air preheater thermocouple temperature monitoring. Background technique [0002] The air preheater is an important supporting equipment for large generator boilers. Inside the air preheater, the incompletely burned accumulation deposited on the surface of the heating element will easily generate hot spots when encountering sufficient oxygen at the air inlet. If the hot spots are slow Slow diffusion will cause the heating element to catch fire and form a fire, which will cause serious and irreparable losses. In order to prevent the air preheater from igniting, it is necessary to install monitoring devices in the air preheater system. Commonly used are infrared hot spot detection detectors and ther...

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Problems solved by technology

[0002] The air preheater is an important supporting equipment for large generator boilers. Inside the air preheater, the incompletely burned accumulation deposited on the surface of the heating element will easily generate hot spots when encountering sufficient oxygen at the air inlet. If the hot spots are slow Slow diffusion will cause the heating element to catch fire and form a fire, which will cause serious and irreparable losses. In order to prevent the air preheater from igniting, it is necessary to install monitoring devices in the air preheater system. Commonly used are infrared hot spot detection detectors and thermocouple detectors, their detection principle only monitors the temperature at the air inlet or outlet of the air preheater, ignoring the influence of temperature fluctuations at the inlet and outlet of other parts of the air preheater on the temperature rise of the entire air preheater The impact is to use the absolute value of the comparison temperature to determine whether there is a hot spot. These devices still have some problems in terms of safety, reliability and service life, and are prone to false alarms.

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