A pulverized coal distributor balance control method and balance control device

Abstract

The invention discloses a balance control method of a pulverized coal distributor. According to the balance control method, a plurality of paddle board valves are uniformly arranged on the circumferential inner wall of the pulverized coal distributor, and the paddle board valves are respectively located near the inlet end of the pulverized coal distributor and are in one-to-one corresponding to primary pulverized coal outlet pipes arranged above; valve plates of the paddle board valves are rotated, and the angle of the valve plates of the paddle board valves and the vertical direction is adjusted, so that the concentration of pulverized coal which enters the corresponding primary pulverized coal outlet pipes above and downstream primary pulverized coal outlet pipes is adjusted. According to the balance control method, the paddle board valves are used, and the movement track of pulverized coal on the front ends of inlets of the primary pulverized coal outlet pipes is adjusted so as to change the concentration of the pulverized coal which respectively enters the primary pulverized coal outlet pipes; additionally, the paddle board valves are located near the inlet end of the pulverized coal distributor, so that the air path is long, the amount of air which respectively enters the primary pulverized coal outlet pipes is not influenced, and the purpose of only adjusting the concentration of the pulverized coal in the primary pulverized coal outlet pipes is achieved.

Description

technical field [0001] The invention belongs to the technical field of coal-fired boiler control, and in particular relates to a boiler primary air pulverized coal distribution regulator structure and a method for adjusting and controlling the primary air pulverized coal concentration. Background technique [0002] For coal-fired boilers, the balanced distribution of pulverized coal in each primary air pulverized coal outlet pipe of the same coal mill has an important impact on the safety, economy and environmental protection of the boiler operation. The uneven distribution of primary air pulverized coal will cause the center of the furnace flame to deviate, slagging in the local area of ​​the furnace and combustion pulsation in the combustion area of ​​the furnace, which will not only cause combustion instability, but may also cause overheating of the superheater and tube explosion. The uneven distribution of wind powder and coal powder not only reduces the combustion effic...

AI Technical Summary

Problems solved by technology

[0005] However, the traditional adjustable shrinkage cavity can only ensure the same air volume between the primary air pulverized coal pipes (the pulverized coal volume is not necessarily equal), or the pulverized coal volume is equal (the air volume is not necessarily equal), which mainly has the following problems:

[0006] 1. Pure air has reached the resistance balance, and it cannot guarantee that the resistance balance of coal powder is also achieved in the case of powder transportation.

[0007] The opening diameter of the traditional adjustable shrinkage cavity is determined in the case of pure wind flow. Due to the difference in the resistance of the adjustable shrinkage cavity to the wind and the pulverized coal, the concentration of pulverized coal between the primary air pulverized coal pipes after the operation with pulverized particles may exist. Significant differences will bring adverse effects on boiler safety and economical operation

[0008] 2. After running with powder, the adjustment of the adjustable shrinkage cavity will affect the wind speed of each primary air pulverized coal pipe

For each primary air pulverized coal pipe with pulverized coal deviation, the flow area of ​​the primary air pulverized coal pipe with high pulverized coal concentration can be reduced by adjusting the shrinkage hole, which can reduce the pulverized coal flow of the pipe, but this will lead to The wind speed of the pipeline is too small, which even leads to the accumulation of coal powder, resulting in pipe blockage

[0010] 3. After running with powder, the adjustable shrinkage cavity may not be able to be adjusted flexibly

[0011] Due to the long-term operation with powder, the gap between the adjustable shrinkage cavity will be filled with coal powder, resulting in jamming, and it is difficult to manually adjust the size of the adjustable shrinkage cavity.

Images