Novel spraying technology for corrosion prevention and abrasion prevention of boiler

Abstract

The invention belongs to the technical field of corrosion prevention and abrasion prevention of boilers, and provides a novel spraying technology for corrosion prevention and abrasion prevention of a boiler, so as to solve the problem in the prior art that the surface of the internal water wall of a boiler is easy to corrode. The novel spraying technology comprises the following steps: adopting supersonic arc spraying, and using an iron-based self-adhesion alloy wire for carrying out bottom spraying with the thickness of not smaller than 0.05 mm; then, using an LX88A ultrahard abrasion-resistant alloy wire or a 45CT Ni-Cr-Ti alloy wire as an anti-abrasion spraying material for carrying out spraying with the coating thickness of 0.5-0.6 mm; using an LG-3 type high-temperature abrasion-resistant anti-corrosion special hole-sealing agent to perform hole-sealing on the surface of the thermal spraying coating of the metal, so as to enable the whole coating to be more compact and further achieve the effect of sealing capillary pores. According to the invention, the working efficiency is high, materials are saved, no pollution is realized, and the energy consumption is low; the operation of the technology is convenient, the problem that the possibility of corrosion of the boiler is high during the actual running of the boiler can be effectively solved, and the boiler maintenance cost is reduced; a coating formed by the technology is corrosion-resistant and has excellent abrasion resistance, stability, corrosion resistance and stress cracking resistance, and the corrosion prevention time of the coating can be prolonged to be one year or above, so that the fact that service life of the boiler is prolonged by one year or above is ensured.

Description

Technical field [0001] The invention belongs to the technical field of boiler anti-corrosion and anti-wear technology, and specifically relates to a new boiler anti-corrosion and anti-wear spraying process. Background technique [0002] Due to the characteristics of the furnace structure and design parameters, the circulating fluidized bed boiler has extremely harsh operating conditions at the heating surface such as the water-cooled wall of the furnace, and has long suffered from high-speed, high-temperature and high-concentration bed material and fuel flue gas. In particular, there are vortex effects and cutting effects that cause serious wear in local areas such as the heating surface of the unburned water-cooled wall in the combustion chamber. The corrosion and thinning of the tube wall are serious, which is easy to cause leakage and tube burst. [0003] Due to its high sulfur content in coal, the water wall in the soot blower area, the water wall in the burner area, low pass, ...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem in the prior art that the surface of the inner water wall of the boiler is easily corroded, the present invention provides a boiler anti-corrosion and anti-wear spraying method