A tower boiler outlet diversion method, mechanism and boiler

Abstract

The invention discloses a tower-type boiler outlet guide method and mechanism and a boiler. The guide method specifically comprises the steps that the position, close to the top of a hearth, of the front wall of an existing tower-type boiler and the position, close to a horizontal flue, of the rear wall of the existing tower-type boiler are bent towards the inside of the boiler by a certain angle to be connected with the horizontal flue, and then the outlet guide mechanism is formed. The outlet guide mechanism enables flue gas in an upper hearth heat exchange area to enter the horizontal flue after the direction is changed; dwelling time of hearth left side flue gas inside the boiler is correspondingly lengthened, flue gas distribution is more even, and temperature differences of flue gas on the left side, the right side, the front side and the rear side of the hearth are effectively reduced; and at the same time, the outlet guide mechanism prevents the flue gas in the upper hearth heat exchange area from seriously deflecting towards the rear wall of the hearth, abrasion from dust particles in the flue gas to the tube walls of heat exchangers close to the rear wall is reduced, and safe operation of a unit is facilitated.

Description

technical field [0001] The invention belongs to the technical field of power plant boilers, and in particular relates to a tower boiler outlet diversion method, a mechanism and a boiler. Background technique [0002] The four-corner tangential boiler is the most common furnace type for domestic coal-fired units. The burners are arranged at the four corners of the boiler. The four airflows are sprayed into the furnace from the outlet, impact and entrain each other, and form an imaginary tangential circle in the center of the furnace, so that the airflow is in the furnace. Intense rotation. Therefore, the flame in the furnace is full, and the air and coal powder are evenly mixed, which is conducive to the formation of good ignition and combustion conditions. At the same time, under the traction force of the induced draft fan, the airflow spirally rises in the furnace until it reaches the furnace outlet, which prolongs the residence time of pulverized coal particles in the fur...

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Problems solved by technology

[0006] Aiming at the shortcomings of existing tower boilers, the present invention provides a tower boiler outlet diversion method, mechanism and boiler, the purpose of which is to make the flue gas in the area of ​​the upper furnace heat exchanger must be diverted instead of directly coming from the rear One side of the wall directly enters the horizontal flue, the distribution of the flue gas will be more uniform, and the residence time of the flue gas on the left and right sides of the furnace will be closer in the furnace, which can greatly reduce the left, right and right sides of the upper furnace heat exchanger area. The smoke temperature deviation between the front and rear sides makes the heat exchanger more evenly heated

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