Near-wall attaching method and near-wall attaching apparatus for preventing high temperature corrosion of water cooling wall of boiler

Abstract

A near-wall attaching apparatus is composed of: patent unit apparatuses, a linking wind pipe and a measurement and control system. The patent unit apparatus is composed of a ventilating sleeve tube, alinking sleeve tube, a spiral baffle plate, a sealing device, a secondary wind spray nozzle, a zirconia ceramic heat insulation disk, a zirconia ceramic heat insulation pipe, an adjustment valve, anaxial adjustment device, etc. A connection pipe and a bottom disk of the secondary wind spray nozzle are respectively in threaded connection with the ventilating sleeve tube and the zirconia ceramic heat insulation bottom disk. A plurality of secondary wind mouths are formed in the circumference of the bottom disk. The zirconia ceramic heat insulation pipe sleeves the outer pipe of the ventilatingsleeve tube, wherein the outlet of the zirconia ceramic heat insulation pipe and the bottom disk of the secondary wind spray nozzle form a compressed air nozzle. The air nozzle sprays a double-layerair film which separates furnace gas and the water wall, so that the water wall has the function of preventing high temperature corrosion. By means of pre-adjustment of the secondary wind spray nozzle, adjustment of the adjustment valve and axial adjustment of the patent unit apparatuses, the near-wall wind apparatus has good parameter adjustable performance and adaptability. Due to the heat insulation disk and the heat insulation pipe, the secondary wind and compressed air achieve double cooling, wherein the secondary wind spray nozzle is detachable, so that anti-burning and replaceable features of the parts in the boiler are achieved. The number of the patent unit apparatuses can be changed according to volume of the boiler.

Description

technical field [0001] The invention belongs to the technical field of boilers, and in particular relates to a wall-attached wind method and device for preventing high-temperature corrosion of boiler water walls. Background technique [0002] In the case of constant coal quality, the main factors affecting the high temperature corrosion of boiler water wall are: 1. The atmosphere near the water wall surface; 2. The temperature of the water wall tube wall; 3. The material of the water wall tube. In order to reduce coal consumption, the unit parameters have been getting higher and higher in recent years, and the temperature of the water-cooled wall tube wall has also increased; with the strong promotion of the national energy-saving and emission-reduction policy, more and more boilers adopt low-nitrogen combustion technology, and the graded low-nitrogen Combustion technology is easy to form a strong reducing atmosphere near the water wall, which makes the problem of high tempe...

AI Technical Summary

Problems solved by technology

The main problems of the method of extending the nozzle into the furnace to supply air are: ①The pressure of the secondary air is low, the rigidity is poor, the distance of flowing along the water wall is short, and the air consumption for forming the water wall covering the air film layer is large, which is harmful to the furnace. Internal combustion and boiler operation have a great influence; ②The temperature of the secondary air passing through the nozzle is high, and the single secondary air is cooled, the cooling effect of the nozzle is poor, and the nozzle is easy to burn out

The main problems of opening a large number of small holes through the fins of the water-cooled wall and supplying air perpendicular to the water-cooled wall surface are: ① When the secondary air is sprayed into the furnace perpendicular to the water-cooled wall surface, it will be injected deep into the furnace, which will affect the combustion in the furnace 2) To form a uniform protective gas film near the water wall, a large number of small holes need to be opened, the air consumption is large, and the combustion in the furnace is greatly affected, and a large wall-mounted bellows needs to be arranged, which requires a large investment

[0004] By searching the prior art, it is found that there is no method or device that can effectively solve the above problems

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