Laser-cladding high temperature resistance abrasionproof structure for special-shaped water cooling wall tube bundle

Abstract

The invention discloses a laser-cladding high temperature resistance abrasionproof structure for a special-shaped water cooling wall tube bundle. The laser-cladding high temperature resistance abrasionproof structure comprises water cooling wall tubes, fins and a guide plate. An abrasionproof layer formed by laser cladding of a ceramic-metal composite material TiB2-Ni-Cr-Mo-Fe-Nb-B-Si-C is arranged on the firing surface of each water cooling wall tube. The ceramic-metal composite material comprises, by weight, 10%-20% of titanium-nickel alloy powder, 1.5%-3.5% of graphite carbon powder, 0.5%-1% of silica powder, 8%-25% of nickel-chromium alloy powder, 5%-10% of iron boride powder and the balance Cr3C2 powder. The two ends of each fin are welded between the surfaces, where no abrasionprooflayer is arranged, of every two adjacent water cooling wall tubes separately so that the multiple water cooling wall tubes can form the water cooling wall tube bundle. The guide plate is arranged at abent area of the water cooling wall tube bundle in the mode of being perpendicular to the corresponding fins. By means of the laser-cladding high temperature resistance abrasionproof structure for the special-shaped water cooling wall tube bundle, the high temperature and abrasion resistance of the surfaces of the water cooling wall tubes is improved remarkably, the problem that side abrasion ofthe bent position of the special-shaped water cooling wall tube bundle with the bent area is serious is solved thoroughly, and the overall service life of the water cooling wall tube bundle is prolonged.

Description

technical field [0001] The invention relates to the technical field of laser cladding, in particular to a laser cladding high-temperature-resistant and wear-resistant structure for special-shaped water-cooled wall tube rows. Background technique [0002] The water wall of the thermal power industry and industrial circulating fluidized bed boiler is located around the lower part of the combustion chamber, and is exposed to high temperature for a long time. Under the action of the primary and secondary air, the fuel particles and fly ash will scour and abrade the water-cooled wall tube to the fire surface. In the light case, the water will be thinned and leaked, and in the severe case, the pipe will burst and burst, forcing the enterprise to stop the furnace and stop production, causing serious economic losses. In order to increase the anti-wear characteristics of water-cooled wall tubes and prolong their service life, the common methods at this stage are: [0003] 1. Thermal...

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Problems solved by technology

Disadvantage: In order to start the arc, only materials with lower hardness can be used, so the hardness of the wear-resistant layer is lower, only 600HV

In addition, during the surfacing construction process, the heat-affected zone is relatively deep, which leads to serious deformation of the substrate during processing and damage to the substrate of the water-cooled wall tube.

[0005] The above two technologies have defects such as low hardness of the wear-resistant layer, easy to fall off, and large damage to the base of the water-cooled wall tube, which cannot effectively prolong the service life of the water-cooled wall tube, and cannot be applied to boiler equipment with severe wear and tear Problems such as boiler water wall tube explosion and shutdown caused by wear and tear

[0006] The water-cooled wall tube is a screen-type structure, and special-shaped water-cooled wall tube rows are required at the joint of the ceiling, and its bending parts are prone to eddy currents, which will lead to increased local wear of the water-cooled wall tubes

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