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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AI-Extracted Technical Summary

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...
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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.

Application Domain

Thermometer applications

Technology Topic

Power stationBoundary temperature +3

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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

Examples

  • Experimental program(1)

Example Embodiment

[0084] Examples:
[0085] Table 1 shows the structural parameters of the rotary air preheater of a three-division bin of a 600MW thermal power generating unit. In the calculation, the cold, heat cycle and preheat length of the heat storage element are 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 14 units before 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 under the starting and stopping stage of the air preheater of the 600MW three-division warehouse and the stable rated working condition. The horizontal and total coordinates are expressed by equivalent period and equivalent length. Figure 4 In order to use the average temperature of the fluid outlet measured by the method of the present invention, after 5 iterations, the temperature value has converged. It can be seen from the figure that the temperature of the primary and secondary air changes inside the rotor, and the average outlet temperatures of the two converge to 338°C and 304°C, respectively.
[0090] Table 2 Comparison of numerical calculation results and field measurement results
[0091] Measured value Measured value error Minimum temperature of heat storage element 74.3℃ 75℃ 0.7℃ Flue gas outlet temperature 135℃ 131℃ -4℃ Primary air outlet temperature 338℃ 335.4℃ -3.6℃ Secondary air outlet temperature 304℃ 310℃ 6℃
[0092] Table 2 is the comparison result of the measured value of the embodiment of this method and the actual measured value on site. It should be pointed out that although the inlet temperature of the primary air is 10°C lower than that of the secondary air, after heating inside the rotary air preheater, the outlet temperature of the primary air is about 34°C higher than that of the secondary air. The actual measurement on site is only 28°C. , The error may be due to the fact that only air leakage is considered in the calculation process, but radial air leakage and axial air leakage are not considered.
[0093] It can be seen from the above examples that the monitoring method proposed by the present invention is feasible. It does not restrict the selection of simulation conditions and model objects. No matter how the equivalent period and equivalent length change, the temperature of the metal heat storage element and the fluid changes. The curves can converge quickly and the measurement accuracy is very high. Therefore, this method can be widely used in actual engineering calculations, providing a numerical reference for the distribution of the internal temperature field of the air preheater, improving the reliability of the air preheater hot spot detection device, and ensuring the unit Safe and stable operation.

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