Lateral wall adherence air adding device of front-back wall face-fired boiler

Abstract

The invention discloses a lateral wall adherence air adding device of a front-back wall face-fired boiler. The lateral wall adherence air adding device comprises a face-fired boiler, a flue and a chimney at the tail end of the flue; an air pre-heater is arranged on the flue; an adherence air nozzle is arranged on a water cooling wall of the lateral wall of the face-fired boiler; the inner end of the adherence air nozzle is deadly plugged; a blowing opening is arranged on the circumference face at the inner end of the adherence air nozzle; and the outer end of the adherence air nozzle is connected with a hot secondary sir pipeline of the pre-heater through a connection hose. The lateral wall adherence air adding device has the advantages of simple structure, convenience in implementation, and high security and reliability; the smoke components at the water cooling wall of the lateral wall of the face-fired boiler can be effectively changed; the temperature of a metal pipe wall in a corresponding area is reduced; and the wall face is prevented from being washed through pulverized coal grains. The requirements of controlling the high temperature at the relevant component and corroding reducible sulfur can be realized, and the influence caused by normal combustion on the boiler can be avoided.

Description

technical field [0001] The invention belongs to the technical field of ancillary equipment for an opposing combustion boiler with front and rear walls, and in particular relates to a device for adding wind to a side wall of an opposing combustion boiler with front and rear walls. Background technique [0002] At present, due to the characteristics of the front and rear walls of the boiler against the combustion of the front and rear walls, the flames will wash the water-cooled wall of the side wall. If there is unburned coal powder in the flame, it will burn on the water-cooled wall of the side wall, thus forming a strong fire. Reducing atmosphere (i.e. high CO concentration and low O 2 concentration). When the sulfur content in the coal is high, under the action of reducing atmosphere, the S in the coal is easy to generate highly corrosive H 2 S, thus adversely affecting the side wall water-cooled wall pipes, forming high-temperature reductive sulfur corrosion. In realit...

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Problems solved by technology

However, since the above-mentioned devices are all replenished from the secondary air with low wind pressure, in order to achieve the purpose of changing the composition of the flue gas and protecting the water-cooled wall, the following two situations occur in the designed wall-attached air adding device: (1) front, The wall-mounted wind device installed on the back wall has a complex structure and a large volume, which requires a substantial modification of the water-cooled wall. In addition, a large air volume is required to protect the water-cooled wall in the middle of the side wall, which makes the secondary wind pressure very small. The wind pressure is smaller, so it has an adverse effect on combustion; (2) The wall-mounted wind adding devices installed on the side wall are small but the number is too large, and a secondary air box needs to be added to the side wall, because the wall-mounted wind adding device is installed On the narrow fins between the two water-cooled wall tubes, it has high requirements for on-site construction and may damage the water-cooled wall

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