Device and method for preventing coking, pollution and corrosion on pipeline wall surface of boiler heating surface

Abstract

The invention discloses a device and a method for preventing coking, pollution and corrosion on a pipeline wall surface of a boiler heating surface. According to the device, strip-type cavities are formed in the front, middle, two sides and rear of pipe bundle of the protected boiler heating surface along the smoke flow direction; holes communicated with the outside are formed in the surfaces of the cavities and serve as nozzles; the cavities are provided with joints; liquid and gas filled through the joints are ejected from the nozzles to form a gas film or liquid film at the peripheries of the cavities; the boiler heating surface pipe bundles which are sequentially arranged in the rear of the cavities are arranged in acting areas of the gas film and the liquid film for effective isolation and protection; ash particles which directly impact the surfaces of the cavities are blocked by the gas film or the liquid film, and the ash particles are prevented from directly washing the pipe bundles of the rear boiler heating surface; the surrounding ash particles are cooled through the gas film, and the adhesiveness of the ash particles is reduced; and moreover, an isolating layer is formed between the boiler heating surface and high-temperature flue gas through the gas film, the ash particles are prevented from being in direct contact with the boiler heating surface, and the adhesion possibility is reduced.

Description

technical field [0001] The invention relates to an anti-corrosion device and a method thereof, in particular to a device and a method for preventing coking, contamination and corrosion of the pipe wall surface of a heating surface of a boiler. Background technique [0002] Boiler heating surfaces are generally composed of radiant, semi-radiant, and convective heating surfaces. According to different functions, it can be divided into auxiliary structures such as water wall, superheater, reheater, economizer and suspension. For boilers burning fossil fuels, due to the presence of ash, the ash particles in the fuel are in a molten or semi-molten state during high-temperature combustion. When the high-temperature flue gas contacts the heating surface of the boiler with a lower temperature, the ash particles in a molten or semi-molten state with considerable viscosity are carried by the flue gas flow, collide with the heating surface, and adhere to the surface of the heating sur...

AI Technical Summary

Problems solved by technology

Due to the large thermal resistance of the contaminated layer, it will destroy the heat transfer characteristics of the heating surfaces of the boiler, greatly reduce the safety and economy of boiler equipment operation, limit the output of the unit, and even directly cause the unit to be forced to shut down

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