Air preheater optical fiber temperature on-line monitoring system and method

Abstract

The invention discloses an air preheater optical fiber temperature on-line monitoring system and an air preheater optical fiber temperature on-line monitoring method. The system comprises distributive optical fiber temperature sensors, a mounting bracket, a stall alarm device and a control cabinet, wherein the control cabinet is connected with the distributive optical fiber temperature sensors and the stall alarm device through signals; the optical fiber temperature sensors are arranged in an air preheater along the radium direction; a rotor of the air preheater is provided with a stall alarm device induction piece hoop; four sets of optical fiber temperature sensors are arranged in an optical fiber temperature sensor mounting frame. The distributive special optical fiber temperature sensors acquire temperature data, and ranges of monitoring blind spots and dead zones are greatly reduced; and by integrated control of a special analyzer, a programmable controller and a touch screen, man-machine conversation is realized, the reliability of the system is improved and the service life of the system is prolonged.

Description

technical field [0001] The invention relates to the technical field of air preheater temperature monitoring, in particular to an optical fiber online monitoring system and a monitoring method for the temperature of a preheater. 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 catching fire, it is necessary to install a monitoring device in the air preheater system. Commonly used are infrared hot spot detection detectors and thermocouple detectors, their detection mechanism adopts the point test method, and uses the absolute val...

AI Technical Summary

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 catching fire, it is necessary to install a monitoring device in the air preheater system. Commonly used are infrared hot spot detection detectors and thermocouple detectors, their detection mechanism adopts the point test method, and uses 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 easy to false alarm

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