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Method for protecting surface of water cooling wall tube of boiler

A technology for water-cooled wall tubes and boilers, which is applied in metal material coating process, melt spraying, coating and other directions, can solve problems such as corrosion resistance and fatigue fracture resistance, and achieve the advantages of thinning and bursting, improving bonding and increasing strength. Effect

Inactive Publication Date: 2019-03-26
上海蜂云航空科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for surface protection of boiler water wall tubes, which first adopts ultrasonic shot peening to the water wall tubes, and then uses supersonic arc spraying technology to solve the problems of wear resistance and corrosion resistance of existing water wall tubes. The problem of poor performance of anti-fatigue fracture, thus improving the service life of water-cooled wall tubes

Method used

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Examples

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Embodiment 1

[0020] This example is directed to the water wall tubes of a new boiler.

[0021] a. Surface pretreatment: clean up the debris on the surface of the water wall tube.

[0022] b. Shot peening: Ultrasonic shot peening is performed on the surface of the water wall tube by spraying projectiles with an ultrasonic shot peening machine.

[0023] The water-cooled wall tube is divided into a fire-facing surface and a back-fire surface. The working environment of the fire-facing surface is relatively harsh, so ultrasonic shot peening and supersonic arc spraying are applied to the fire-facing surface.

[0024] In the ultrasonic shot peening process, the frequency of ultrasonic vibration and the diameter, material and weight of the projectile are optimized so as to uniformly perform shot peening on the water wall tube. The projectile described in this embodiment is a cast steel shot with a diameter of 2mm, and its total weight is 0.6g. In this embodiment, the weight of the projectile is ...

Embodiment 2

[0034] When a thermal power plant was shut down for maintenance, it was found that the water-cooled wall tubes had high-temperature sulfur corrosion pits. This embodiment protects the slightly corroded water wall tube. First, clean up the sundries on the surface of the water wall tube.

[0035] Then use an ultrasonic shot peening machine to spray projectiles to perform ultrasonic shot peening on the surface of the water wall tube. In the present embodiment, adopt the cast steel shot that diameter is 1.30mm, and weight is 0.65g, and in the present embodiment, the relation ratio of the weight of projectile and the surface area of ​​the processed water wall pipe is about 1g:1.44m 2 , the processing time is 75s. After the ultrasonic shot peening treatment, the harmful residual tensile stress on the surface of the water wall tube is eliminated, and the beneficial compressive stress is introduced to improve the mechanical properties, fatigue performance and stress corrosion resist...

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Abstract

The invention discloses a method for protecting the surface of a water cooling wall tube of a boiler. The method includes the process steps of shot peening treatment and supersonic arc spraying, and specifically includes the following steps that a, surface pretreatment is conducted, specifically, sundries on the surface of the water cooling wall tube are cleared; b, shot peening is conducted, specifically, the surface of the water cooling wall tube are subjected to ultrasonic shot peening treatment by projectiles ejected by an ultrasonic shot-blasting machine; c, spraying is conducted, specifically, after shot peening, supersonic arc spraying equipment is used for spraying an HDS-88A coating on the water cooling wall tube after shot peening treatment, and the thickness of the coating is 0.6-0.8 mm; and d, hole sealing is conducted, specifically, the HDS-88A coating is subjected to hole sealing through a hole sealing agent. According to the method for protecting the surface of the watercooling wall tube of the boiler, the technologies of ultrasonic shot peening and supersonic spraying are combined, properties such as wear resistance, fatigue fracture resistance and corrosion resistance of the water cooling wall tube are effectively improved, and the service life of the water cooling wall tube is prolonged.

Description

technical field [0001] The invention relates to the technical field of anti-wear and anti-corrosion technology for boiler water-cooled wall tubes, in particular to a method for protecting the surface of boiler water-cooled wall tubes by using ultrasonic shot blasting and spraying. Background technique [0002] The water wall is the main heating part of the boiler, which is composed of several rows of steel pipes and distributed around the boiler furnace. Its interior is flowing water or steam, and its outer surface receives the heat of the flame in the boiler furnace. The functions of the water-cooled wall are: (1) to absorb the radiant heat in the furnace and heat the water into saturated steam; (2) to protect the furnace wall, simplify the structure of the furnace wall, and reduce the weight of the furnace wall, which is mainly because the water-cooled wall absorbs the radiant heat in the furnace , to reduce the temperature of the furnace wall; (3) absorb the heat in the ...

Claims

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Application Information

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IPC IPC(8): C23C4/131C23C4/06C23C4/18
CPCC23C4/06C23C4/131C23C4/18
Inventor 蔡晋
Owner 上海蜂云航空科技有限公司
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