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A method for leveling the primary wind speed of a pulverized coal boiler

A pulverized coal boiler and wind speed technology, which is applied in the field of primary wind speed leveling of pulverized coal boilers, can solve the problems of large test time and tedious primary wind leveling work, so as to save test time and power consumption, save adjustment and improve quality effect

Active Publication Date: 2016-08-24
STATE GRID CORP OF CHINA +2
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  • Description
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AI Technical Summary

Problems solved by technology

However, at present, many power plant boilers are configured as direct-blowing pulverizing systems. The primary air duct of this boiler is generally not equipped with an online wind speed monitoring device. Make tentative adjustments, which often require multiple adjustments and measurements to complete, requiring a lot of trial time

Method used

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  • A method for leveling the primary wind speed of a pulverized coal boiler
  • A method for leveling the primary wind speed of a pulverized coal boiler
  • A method for leveling the primary wind speed of a pulverized coal boiler

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Experimental program
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Embodiment 1

[0028] (1) The four primary air pipes on the same floor of the pulverized coal boiler are respectively recorded as #1 pipe, #2 pipe, #3 pipe and #4 pipe. Add a representative point, usually the middle point. as attached figure 1 .

[0029] (2) Before the test, the ventilation rate of the coal mill was estimated according to the wind speed of the primary air duct in the cold state to be adjusted, and the ventilation rate of the coal mill was adjusted to the calculated value.

[0030] (3) Use a prefabricated Pitot tube with a scale to measure the dynamic pressure at each point of the primary air duct, and measure the representative point dynamic pressure at the same time.

[0031] (4) Calculate the calibration coefficient K of each representative point of the primary air duct according to the measurement results 1 , each primary air duct wind speed V 1 , the wind speed deviation δv of each primary air duct 1 , you can refer to Table 1 and Table 2 for calculation.

[0032] ...

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Abstract

The invention relates to a primary wind speed leveling method, which mainly comprises the following steps that when a surveying rod of a Pitot tube or backrest tube for measuring dynamic pressure is produced, an intermediate point is taken as a representative point, a dynamic pressure expected value of the representative point is calculated by a test, the adjustment is carried out in accordance with the dynamic pressure expected value, and the test adjustment and measurement frequency can be reduced, so that a lot of repeated work can be avoided, and thus the test time is reduced, and the leveling test quality is improved.

Description

technical field [0001] The invention relates to a wind speed leveling method, in particular to a primary wind speed leveling method for a pulverized coal boiler. Background technique [0002] A wind speed cold-state leveling test of a pulverized coal boiler is very important for boiler combustion. Poor wind speed leveling effect is not conducive to the combustion of pulverized coal. If it is light, it will cause high carbon content in fly ash and affect the efficiency of the boiler. The tubes are blocked by powder accumulation, the overheating of the heating surface causes high-temperature corrosion, and the deflection of the combustion center causes the flame to brush the wall and cause large-scale coking of the boiler, etc., all of which seriously threaten the safe operation of the boiler. Therefore, it is generally required to conduct a cold-state primary wind speed leveling test before the boiler is ignited and started. The quality of the test results will directly affec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23N3/00
Inventor 杨守伟
Owner STATE GRID CORP OF CHINA
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