Online monitoring method for flue gas temperature of hearth outlet of power station boiler

Abstract

The invention discloses an online monitoring method for the flue gas temperature of a hearth outlet of a power boiler, comprising the steps of: placing a plurality of targets at a vertical section near a smokestack of a boiler for sensing the temperature; installing a near infrared imaging device on the side wall of a horizontal flue of the boiler for collecting the radiation energy of the targets; carrying out communication by the near infrared imaging device with a computer through a serial port and RS232, sending the collected radiation energy of the targets to the computer, calculating by the computer to obtain temperature data of the targets; and then sending the temperature data of the targets to a host computer for processing, and converting the temperature to the flue gas temperature of the position of the targets. The invention has the advantages that the average temperature at the section of the hearth outlet, the average temperature of the upper / lower and left / right side, and the highest / the lowest temperature can be continuously monitored, the distribution curve of the temperature of the section can be drawn, and a plurality of alarm functions are set; and the invention is beneficial to the safe and economic operation of a boil with a large capacity and high parameters.

Description

technical field [0001] The invention relates to a monitoring method, in particular to an online monitoring method for flue gas temperature at the furnace outlet of a power plant boiler. Background technique [0002] The measurement of the flue gas temperature in the furnace of the power plant boiler is of great significance is the "monitoring of the flue gas temperature at the furnace outlet of the power plant boiler". Because this position is the junction point between the convection zone and the radiation zone, the flue temperature at the furnace outlet is of great significance to the boiler operation control. The temperature change at this position can timely reflect the change of energy in the furnace and the change of the operating state of the boiler. The wind and smoke system participates in the energy exchange and combustion process of the system, and has a great impact on the economy, reliability and safety of the boiler system. Controlling the parameters of flue g...

AI Technical Summary

Problems solved by technology

Due to this reason, temperature deviation of the reheated and superheated steam on both sides may occur, as well as over-temperature creep damage of the tube panel, and tube burst due to serious over-temperature

At the same time, due to the high temperature, the smoke and dust may soften and coke on the heat exchange screen, which will have a significant impact on the safety and economy of boiler operation.