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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] This embodiment is aimed at the water wall tube of a new boiler.

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

[0022] b. Shot peening: Use an ultrasonic shot peening machine to spray the projectiles on the surface of the water wall tube.

[0023] The water wall pipe is divided into the fire surface and the back fire surface. The working environment on the fire surface is relatively harsh, so ultrasonic shot peening and supersonic arc spraying are applied to the fire surface.

[0024] In the ultrasonic shot peening process, the frequency of the ultrasonic oscillation and the diameter, material and weight of the shot are optimized so that the water wall tube is shot peened uniformly. The projectile in this embodiment is a cast steel pellet with a diameter of 2mm, and its total weight is 0.6g. In this embodiment, the ratio of the weight of the projectile to the surface area of ​​the water wall tube being processed ...

Example Embodiment

[0033] Example 2

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

[0035] Then use an ultrasonic shot peening machine to spray the projectiles on the surface of the water wall tube to perform ultrasonic shot peening. In this embodiment, a cast steel shot with a diameter of 1.30mm and a weight of 0.65g is used. In this embodiment, the ratio of the weight of the shot to the surface area of ​​the water wall tube being processed is about 1g:1.44m 2 , The processing time is 75s. After ultrasonic shot peening, the harmful residual tensile stress on the surface of the water wall tube is eliminated, and beneficial compressive stress is introduced to improve the mechanical properties, fatigue performance and stress corrosion resistance of the material,...

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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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