Station boiler air preheater hot spot detecting method based on analog computation of rotor temperature field

Abstract

The invention discloses a power station boiler air preheater heat spot detecting method based on rotor temperature field analog computation. The method is implemented according to the following steps: parameters of the air preheater needing to be monitored are determined and a temperature reference value is set; various parameters are collected in real time and the obtained parameters are input into a computation module; a boundary temperature value is initialized, and boundary conditions are determined; the temperature of the section, the interior of the sub-bin and a fluid and a heating surface on the exit boundary is obtained by using a difference equation; if temperature error obtained before and after an interactive process is in accordance with the set temperature reference value requirement, the computation is over, otherwise, the boundary temperature value is renewed to carry out interaction again. When fault happens to an infrared heat spot sensor or an executing mechanism ofan existing heat spot detecting system, the system sends out a switching command, by using the temperature field parameters obtained by the analog computation of the method of the invention as the reference value for control, the reliability of the air preheater heat spot detector is improved and the safe and stable operation of the detecting system is guaranteed.

Description

Hot spot detection method of power plant boiler air preheater based on simulation calculation of rotor temperature field technical field The invention belongs to the technical field of power equipment monitoring, and relates to a method for detecting hot spots of an air preheater of a power plant boiler (hereinafter referred to as an air preheater), in particular to a method for detecting hot spots of an air preheater of a power plant boiler based on simulation calculation of a rotor temperature field. Background technique The air preheater of the power station boiler is a heat exchanger that uses the exhaust heat of the boiler to heat the air. The air preheater can increase the air temperature required by the boiler combustion and pulverizing system, and at the same time further reduce the exhaust gas temperature and reduce the heat loss of the exhaust gas. Depending on the capacity, the diameter of the 300-1000MW air pre-heater is about 10-15 meters, and the weight is ab...

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Problems solved by technology

The existing thermal measurement method can only obtain the average temperature of the inlet and outlet of the flue gas and air, the measurement accuracy cannot meet the requirements, and the limitations are large, and the temperature field distribution of the flue gas, air and rotor inside the air preheater cannot be accurately obtained

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