Waste incineration power generation boiler water wall remanufacturing method

Abstract

In order to solve the problem that the service live of the front and back surfaces of a boiler water wall tube bank is seriously uneven, the invention provides a waste incineration power generation boiler water wall remanufacturing method. The waste incineration power generation boiler water wall remanufacturing method comprises the following steps of preparing a coating on the surface of the tubebank by utilizing a composite gradient coating surface strengthening technology on the back surface of the original tube bank, namely the front surface of a remanufactured tube bank; reinforcing andstrengthening the front surface of the original tube bank, namely the back surface of the remanufactured tube bank by using an alloy surfacing surface repairing technology; and repairing a surface corrosion layer and fatigue microcracks on the surface of an inner tube of the original tube bank by using a chemical plating repairing and strengthening technology. Therefore, recycling of the boiler metal tube bank material is achieved, the cost for remanufacturing the water wall tube bank only accounts for 49.8% of the cost for manufacturing a new tube bank, the development strategy of national circular economy is met, and creativity of the industry and guidance of related fields are achieved.

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 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 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 evaporation heating surface composed of the inner wall of the boiler furnace. The function of the water-cooled 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, and at the same tim...

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