A louver-like pulverized coal equalization valve

Abstract

The invention discloses a louver type pulverized coal balancing valve and aims to solve the problem that an adjustable shrinkage cavity widely used by a coal-fired power plant at present cannot effectively regulate primary air pipe resistance so as not to effectively regulate the primary air pulverized coal flow under the condition of running with powder. The louver type pulverized coal balancing valve comprises a valve element (1), a shell (2), a bearing (3) and an actuator (4), wherein the valve element (1) is composed of movable blades (5), rotating shafts (6) and fixed blades (7). The louver type pulverized coal balancing valve is characterized in that the number of the movable blades (5) and the fixed blades (7) is two to ten; the movable blades (5) are fixed on multiple groups of rotating shafts (6) and can rotate for 0-180 degrees in a pipe; the fixed blades (7) are fixed in the shell (2) in the radial direction. Under the condition of running with powder, the louver type pulverized coal balancing valve still can flexibly and effectively continuously regulate the pipe resistance so as to achieve the purposes that primary air pipe pulverized coal distribution is uniform and combustion is optimized.

Description

technical field [0001] The invention relates to a louver-like pulverized coal balance valve used for regulating the flow of pulverized coal in primary air in a pulverized system of a coal-fired boiler. Background technique [0002] For coal-fired boilers, the balance of air powder distribution in the primary air duct has an important impact on the safety, economy and environmental protection of the boiler operation. The uneven distribution of the primary air powder will cause flame deflection in the center of the furnace flame, slagging in the local area of ​​the furnace and combustion pulsation in the combustion area of ​​the furnace. This will not only cause combustion instability, but will even cause the overheating of the superheater to burst. The uneven distribution of air powder not only reduces the combustion efficiency of the boiler, but also increases NO x The amount of generation is an urgent problem to be solved for the safe operation of power plants and energy...

AI Technical Summary

Problems solved by technology

[0006] 1. Pure air has reached the resistance balance, but it cannot guarantee that the resistance balance will also be achieved in the case of powder delivery

[0007] The size of the opening diameter of the traditional adjustable shrinkage hole is determined in the case of pure wind flow. After installing the throttle hole, the pipeline resistance can be balanced to a certain extent, but due to the difference in resistance components, even in the pure air state, the pipeline resistance can be well balanced. Balanced, there may still be obvious deviations after the parallel tubes are running with powder

If this deviation is in the same direction as the test adjustment error of the orifice and superimposed on each other, there will be an obvious flow velocity deviation in the parallel pipe, which will adversely affect the safety and economy of the boiler.

[0008] 2. After running with powder, the opening diameter of the adjustable shrinkage cavity cannot be adjusted flexibly

The traditional adjustable shrinkage cavity cannot be adjusted flexibly and effectively in the case of running with powder, so it cannot achieve a good adjustment effect

[0010] 3. The influence of traditional adjustable shrinkage cavity on the flow pattern of pulverized coal is not good

However, this adjustment method will have a great impact on the flow pattern of pulverized coal, resulting in uneven flow of pulverized coal

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