A method for uniform heating of high-frequency remelting structure of water-cooled wall tube row coating

Abstract

The invention discloses a method for uniformly heating the high-frequency remelted structure of the water-cooled tube row coating, and relates to the technical field of coating preparation. The method for uniformly heating the high-frequency remelting water-cooled wall pipe row structure includes the following steps: the first step: preparation work, sandblasting the heating surface of the pipe row, the second step: fixing the pipe row, and preparing The good tube row is fixed on the surface of the conveying device, and the heating surface of the tube row is flame-sprayed with self-fluxing alloy. The third step: fix the spray gun bracket at the entrance of the induction coil, and fix the spray gun nozzle on the surface of the spray bracket above the tube row. Make sure that there is a nozzle above the top of each tube. The height of the nozzle is exactly at the gap between the high-frequency coil and the tube row. By spraying high-pressure air to the top of each tube of the tube row, the local temperature will be properly lowered, thereby improving the overall tube row temperature. The consistency of remelting on the coating surface can effectively improve the quality of high-frequency induction remelting, so that the service life and working reliability of the water-cooled wall tube row can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of coating preparation, in particular to a method for uniformly heating the high-frequency remelted structure of the water-cooled tube row coating. Background technique [0002] In recent years, with the implementation of major national circular economy guidelines and policies, my country's waste incineration power generation has entered a rapid development track, and the installed capacity and power generation of waste incineration power generation have developed rapidly, ranking first in the world. The membrane water wall is the main heating part of the boiler. It is an airtight tube row welded by tubes and fins, and is laid on the evaporation heating surface composed of the inner wall of the boiler furnace. The function of the membrane water-cooled wall tube row is to absorb the radiant heat of the high-temperature flame or flue gas in the furnace, generate water vapor in the tube for power generation, an...

AI Technical Summary

Problems solved by technology

[0003] In order to deal with the problem of reduced corrosion resistance of materials, a composite method of flame spraying self-fluxing alloy + high-frequency induction remelting is used to prepare a coating on the surface of the tube row, but there is a problem in the high-frequency remelting process of the water-cooled wall tube row The troublesome problem is that due to the different distances between the points on the coating surface of the tube row and the inner upper surface of the coil, the top of the tube that is closest to the upper surface of the coil (about 5-10mm) will undoubtedly start to melt first during remelting, and the top of the tube and the upper surface of the coil will undoubtedly start to melt first. The distance between the tube roots is about 25mm. Continue heating until the tube roots and fins start to melt, and the top of the tube has begun to melt due to the long heating time, and even partially becomes a liquid phase and gradually flows to both sides.

The resulting result is that the thickness of the coating is uneven at the top and thick at the bottom; the second is that it has a great impact on the quality of remelting. Service life is compromised due to insufficient remelting