A real-time measurement method of boiler outlet flue temperature based on multi-point stereo measurement

Abstract

The invention discloses a real-time measurement method for flue gas temperature at the outlet of a boiler based on multi-point stereo measurement. By constructing a multi-point stereo measurement system, multiple rows of flue temperature measurement points are set in the horizontal flue of the boiler: at the rear side of the third-stage superheater, at the fourth-stage A row of equidistant smoke temperature measuring points are respectively set on the rear side of the first-stage superheater and the rear side of the second-stage reheater, and each row of smoke temperature measuring points is equidistant from the front and rear heating surfaces; For the flue gas temperature at the outlet of the boiler furnace, you can see the online real-time measurement value of the flue gas temperature on the DCS screen of the centralized control center. To monitor the boiler operation in real time to ensure safe operation.

Description

technical field [0001] The invention belongs to the technical field of power plant boiler monitoring, and relates to a real-time measurement method for boiler outlet smoke temperature based on multi-point stereo measurement. Background technique [0002] Furnace flue gas temperature, especially the flue gas temperature in the furnace outlet area, is a very critical parameter that needs to be monitored during the operation of power plant boilers. Realizing real-time and accurate temperature measurement of furnace flue gas is crucial to ensuring the safe operation of thermal power plants, improving unit economy and optimizing boilers. Design matters. [0003] In the design of traditional thermal power plants, the smoke temperature probes (one set on the left and one on the left) are specified with the boiler as a means of measuring the smoke temperature at the furnace outlet. figure 1 shown. The smoke temperature probe is an electromechanical device that sends a thermocouple...

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Problems solved by technology

However, the temperature probe can only work within 1 hour of starting powder feeding and when the smoke temperature is <530°C, and the 8m-9m long smoke temperature probe is easily damaged when entering and leaving the high-temperature furnace (most boiler smoke temperature probes are damaged), so it cannot meet the needs of monitoring the whole process of boiler operation, which is not conducive to the optimization of boiler combustion

In particular, the power plants of various power generation groups are currently carrying out coal type adaptability test research and operation monitoring management due to the changeable coal types. It is particularly important to realize the measurement of the furnace outlet smoke temperature within the full load range. Obviously, the traditional The smoke temperature probe temperature measurement system cannot meet the smoke temperature measurement requirements of the furnace outlet of the thermal power plant

At the same time, it should be noted that the traditional smoke temperature probe measurement method only simply compensates the ambient temperature, and does not correct the low measurement temperature caused by the low-temperature heating surface around the thermocouple. It can only characterize the change trend and rate of the smoke temperature, not It can well represent the real temperature of flue gas

Moreover, the traditional flue temperature probe flue temperature measurement system has only one temperature probe on the left and right sides, which can only measure the flue gas temperature along the width direction of the fixed position of the horizontal flue of the boiler, which cannot satisfy some unit operating conditions and conditions based on the temperature field of the entire furnace outlet. Equipment Condition Analysis Requirements

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