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

A technology of analog calculation and rotor temperature, applied in the application of thermometers, thermometers, instruments, etc., it can solve the problems of large limitations, the measurement accuracy cannot meet the requirements, and the temperature field distribution of the air preheater cannot be accurately obtained, and achieves safety and stability. The effect of improved operation, reliability and accuracy

Inactive Publication Date: 2009-03-11
XIAN UNIV OF TECH
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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

Method used

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

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Embodiment

[0085] Table 1 shows the structural parameters of the three-compartment rotary air preheater of a 600MW thermal power generating unit. In the calculation, the cold and heat cycles and the preheating length of the heat storage element are respectively divided into 50 units. According to the ratio of the primary and secondary air on the air side of the air preheater of the 600MW unit, the first 14 units of the cold cycle are regarded as the primary air, and the remaining The next 36 units are used as secondary air.

[0086] Table 1 Basic parameters of a 600MW boiler rotary air preheater

[0087]

[0088]

[0089] figure 2 with image 3 It is the three-dimensional temperature distribution diagram of the metal heat storage element in the start-stop stage of the 600MW three-compartment air preheater and the stable rated working condition, and the horizontal and total coordinates are expressed by the equivalent cycle and equivalent length respectively. Figure 4 For ...

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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 of an 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

technical field [0001] 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 [0002] 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 about 800-2500 tons. In the actual operation process, due to its own structure, the air pre-heater has the hi...

Claims

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Application Information

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IPC IPC(8): G01K13/00
Inventor 刘丁刘涵杨延西
Owner XIAN UNIV OF TECH
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