Near-wall air device for preventing high-temperature corrosion of water-cooled wall of power station boiler

Abstract

The invention discloses a near-wall air device for preventing the high-temperature corrosion of the water-cooled wall of a power station boiler, which comprises an air duct, a regulating valve, a near-wall air box, near-wall air unit nozzles, a fuel component on-line monitor and a speed measuring device, wherein the direction of the near-wall air is parallel to the axis of a pipe of the water-cooled wall, the resistance along the course is small and the air speed reduction is slow; only one layer of near-wall air nozzles is required to be arranged in a burner area and the system structure is simple; and the nozzles are flexibly arranged, the nozzle cooling condition is good, the operational air volume is small and the stability is high. Thus, the device is suitable to be promoted for preventing the high-pressure corrosion of the water-cooled walls of power station boilers.

Description

technical field [0001] The invention belongs to the technical field of power station boilers, and relates to a wall-attached wind device for preventing high-temperature corrosion of a water wall of a power station boiler. Background technique [0002] In recent years, with the rapid development of modern society, the demand of the power industry has been increasing, and the capacity of various boilers and the heat load of the furnace volume have also been increasing. The high-temperature corrosion of the water wall in the burner area has become a common problem in coal-fired power plant boilers. It is also one of the main problems affecting the safe production of electric power. [0003] The high-temperature corrosion of the water wall in the burner area is a complex physical and chemical process, which is mainly related to the temperature near the water wall, the composition of flue gas, the characteristics of coal quality and the movement of coal particles. Due to uneven ...

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Problems solved by technology

[0005] 1. Each burner in the burner area must be equipped with a wall-mounted air device, which requires a large investment and a complex system that is prone to problems

[0006] 2. The wind direction of the wall-attached wind is parallel to the plane of the water-cooled wall, but perpendicular to the axis of the water-cooled wall, and the wind speed attenuates relatively quickly. To solve the high-temperature corrosion of the water-cooled wall, a higher wind speed must be used, so the total air volume of the wall-attached air invested is relatively large. It is easy to affect the normal combustion conditions of the furnace and the combustion efficiency of the boiler

[0007] 3. The cooling condition of the wall-attached air nozzle is relatively poor

The wall-adhering air nozzle is located in the burner area, and the heat load is very high. The inventor found through calculation that the flow field of the wall-adhering air in the nozzle is relatively uniform, and the heat transfer coefficient between the air and the metal wall is very small, and it is easy to burn out the nozzle.

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