Composite protection process for fire grate segment based on plasma surfacing and laser cladding technologies

Abstract

The invention discloses a composite protection process for a fire grate segment based on plasma surfacing and laser cladding technologies. The fire grate segment is divided into a drying section, a combustion section and a burnout section, the drying section and the burnout section are sprayed with high-chromium nickel-based self-fluxing alloy to form a protection layer, and the combustion sectionadopts nickel-based alloy and metal ceramic NiCr-Cr2C3 to be sprayed to form double protective layers. According to the composite protection process, for different working intervals of the fire gratesegment, a comprehensive protection technology, corresponding to the actual working conditions of all the segments, for the surface of the fire grate segment is formulated instead of only adopting the same method for protection, and on the premise that the protection effect and the service life are guaranteed, the energy and materials are saved, and the production cost of enterprises is reduced.

Description

technical field [0001] The invention belongs to the technical field of waste incineration equipment, and in particular relates to a fire grate composite protection technology based on plasma surfacing and laser cladding technology, which is applied in a waste power station. Background technique [0002] After decades of development in waste incineration technology, grate-type incinerators account for more than 80% of the world's total waste incineration market due to their mature technology, reliable operation, and wide adaptability. The function of the grate in the garbage power station is to transport the garbage into the furnace for combustion treatment. The combustion process of garbage incineration is mainly completed on the grate, which is the most critical component of the combustion chamber of the incinerator. When the grate is working, the garbage is piled on the grate, and the incineration flame spreads from the burning layer of the garbage pile to the surface and ...

AI Technical Summary

Problems solved by technology

When it is found that the grate is scrapped, it is often necessary to replace the grate with a new one, causing the furnace to be shut down for maintenance, so that the operating cost is relatively high

[0003] Therefore, those skilled in the art have developed multiple methods to increase the life-span of the grate sheet, wherein a common method is to improve its wear resistance and corrosion resistance by overlaying stainless steel or inconel625 on the surface of the grate sheet, and prolong the service life, but The temperature resistance of stainless steel is lower than 750°C, and the protection performance will decrease rapidly if the temperature exceeds this temperature; although the inconel625 alloy has outstanding anti-corrosion performance, it is weak in wear resistance and high temperature oxidation resistance

[0004] In addition, thermal spraying technology is also used for protection, but due to the high porosity and low bonding strength, it is not suitable for the protection of grate pieces; It is also not applicable to the grate, because the working surface of the grate is a three-dimensional special-shaped structure, and the surface is uneven, so it is difficult to implement the induction coil non-contact heating process