Method for remanufacturing water wall of waste incineration power generation boiler

Abstract

Aiming at the problem that the service life of the front and back sides of the boiler water wall tubes is seriously uneven, the invention provides a method for remanufacturing the water wall of the waste incineration power generation boiler. Layer surface strengthening technology is used to prepare coatings on the surface of the tube row; the front of the original tube row, that is, the back of the remanufactured tube row, is reinforced and strengthened by alloy surfacing welding surface repair technology; the inner tube surface of the original tube row is repaired and strengthened by electroless plating Repair surface rust layer and fatigue microcracks. In this way, the recycling of boiler metal tube row materials is realized, and the cost of remanufacturing water-cooled wall tube rows is only 49.8% of the cost of manufacturing new tube rows. sex.

Description

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

AI Technical Summary

Problems solved by technology

[0004] First, corrosion, wear, creep, fatigue, overheating and other failures will cause surface corrosion pits, fly ash wear marks, and fatigue microcracks, which will cause the pipe on the heating surface to become thinner, and eventually even cause accidents such as pipe burst and leakage, which greatly reduces service life of the boiler;

[0005] Second, fouling, slagging, and fouling will reduce the heat transfer capacity of the heating surface in the furnace

Even in the same channel, due to the distance from the combustion core area, the height and other spatial positions are very different, which causes the corrosion and wear of the heating surface of the tube row at different positions to be very different, and finally results in a large difference in service life.

However, the current scrap standard of the national standard is only an indicator of the average thinning of the pipe thickness (30% reduction in wall thickness)

Images