Protection device for preventing high-temperature corrosion of water cooling wall of opposed firing boiler and use method of protection device

Abstract

The invention relates to the technical field of hedging boiler water-cooled wall protection equipment, in particular to a protection device for preventing high-temperature corrosion of a hedging boiler water-cooled wall and a use method.The protection device comprises an air preheater, a first hot air pipe is arranged on one side of the air preheater, and the side, away from the air preheater, of the first hot air pipe is fixedly connected with an outer wrapping hot air pipe; air outlet pipes are symmetrically arranged in the outer wrapping hot air pipe, the outer portions of the air outlet pipes are sleeved with boiler flues, and external air nozzles are arranged at the ends, away from the outer wrapping hot air pipe, of the air outlet pipes. A positioning block drives a telescopic connecting rod to reciprocate up and down in a hollow supporting pipe, so that gas in an external air nozzle is blocked and blown to two sides, pulverized coal particles are effectively prevented from being accumulated near the side wall surface to be burnt to generate a local strong reducing atmosphere, meanwhile, the effect of increasing the area of a protective water wall is achieved, and the service life of the protective water wall is prolonged. Therefore, the service life of the water cooling wall is prolonged, and the problem of short service life of the water cooling wall is solved.

Description

technical field [0001] The invention relates to the technical field of protection equipment for a water wall of a flushing boiler, in particular to a protection device for preventing high temperature corrosion of a water wall of a flushing boiler and a use method thereof. Background technique [0002] As the national environmental protection situation is becoming increasingly severe, all large and medium-sized boilers have undergone low-nitrogen emission transformation. Difficult, easy to produce incomplete combustion, and prolong the flame, forming a reducing atmosphere near the metal wall surface, increasing the corrosion of the pipe wall. [0003] When the fineness of pulverized coal is coarser and the pulverized coal particles are larger, it is less likely to be burned out. The pulverized coal (or coke) particles diffuse to burn near the water wall, and it is easier to form a local strong reducing atmosphere, resulting in high temperature corrosion. The larger the pulve...

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Problems solved by technology

[0006] By making the wall-attached cleaning plate drive the cleaning scraper on the surface to clean the slagging inside the nozzle protective shell during the rotation process, it can avoid the blockage of the external air nozzle from affecting the protection effect on the water wall, so as to improve the use effect of the external air nozzle , to solve the existing problem of slagging inside the external air nozzle, which can not only increase the service life of the external air nozzle and improve the blowing effect, but also help to protect the water wall; by making the positioning block drive the expansion joint The rod reciprocates up and down inside the hollow support tube, so that the gas inside the external air nozzle is blocked and blown to both sides, so the rigidity of the side wall wind is increased, and the coal powder particles are effectively prevented from accumulating near the side wall surface and burning to cause localized Strong reducing atmosphere, at the same time achieve the effect of increasing the area of ​​the water cooling wall, thus increasing the service life of the water cooling wall and solving the existing problem of short service life of the water cooling wall

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