Return pipeline repair process of circulating fluidized bed boiler

Abstract

The invention discloses a return pipeline repair process of a circulating fluidized bed boiler. A return pipeline comprises a shell and a refractory material; and the process comprises the following steps: the collapse part of the refractory material is determined to expose the shell; a grabbing nail is welded on the inner wall of the shell corresponding to the collapse part; an aluminum silicateplate is bonded along the inner wall of the shell; a thermal insulation casting material is cast on the inner side of the aluminum silicate plate; a wear-resistance molding material is rammed on the thermal insulation casting material; and hexsteel is paved outside the wear-resistance molding material, and is welded with the grabbing nail. The repair process overcomes the complicated process of plate type casting of the casting material, enables the local-repaired casting material to form a whole with the periphery, achieves high anchoring capacity, prolongs the boiler operation period, reduces the loss caused by secondary collapse of the casting material, reduces the occurrence rate of boiler accidents, and reduces the loss caused by collapse of the casting material.

Description

technical field [0001] The present invention generally relates to a boiler repair process, and more specifically relates to a partial repair process of a return pipeline of a circulating fluidized bed boiler. Background technique [0002] Circulating fluidized boiler technology is a clean and high-efficiency combustion technology with broad application prospects. Especially for difficult-to-combustible coal, rational use of circulating fluidized bed, a high-efficiency, low-pollution coal-fired technology, can easily obtain better economic benefits and is beneficial to Make full use of energy resources and protect the atmospheric environment. [0003] The feeding device of the circulating fluidized bed boiler is to send the high-temperature materials separated by the cyclone separator of the boiler to the furnace of the boiler through the feeding air, so as to circulate the materials and improve the combustion efficiency of the boiler. Therefore, the feeding device is very im...

AI Technical Summary

Problems solved by technology

[0004] The return device of the existing circulating fluidized bed boiler includes a feeder pipeline and a return valve body. The manufacturing cost of the return pipeline is low, and it only needs to be casted with castables. Under the joint action of mechanical vibration, collapse often occurs. Once the partial pouring material of the return pipeline collapses, the external steel plate burns red, the steel plate burns through, and high-temperature return material ash will spew out. The boiler must also be shut down for maintenance. The loss after the furnace is relatively large. If local repairs are carried out without stopping the furnace, because the repaired castable and surrounding castables are not a whole, the fixing ability is weak and the service life is short, which will also cause losses.

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