Near-water-cooling-wall fly ash anti-slagging system and method for corner tangential boiler

Abstract

The invention discloses a near-water-cooling-wall fly ash anti-slagging system and method for a corner tangential boiler. The near-water-cooling-wall fly ash anti-slagging system comprises anti-slagging air nozzles, water cooling walls, a boiler main burner, boiler over-fire air and a hot primary air mother pipe; the anti-slagging air nozzles are arranged on the water cooling walls of the boiler; a fly ash cooling air system is arranged below the boiler over-fire air and above the boiler main burner; and the fly ash cooling air system comprises a plurality of fly ash cooling air nozzles. The system is reasonable in design and simple in structure, the near-wall fly ash temperature of the water cooling walls can be flexibly, conveniently and rapidly cooled according to actual requirements, the reducing atmosphere is inhibited, and the aim of preventing the water cooling walls of the tangential boiler from slagging is achieved. Meanwhile, the system has the characteristics of simplicity and convenience in installation engineering and flexible arrangement and construction, and the problem that an upper-layer burner area and a reduction area of the corner tangential boiler are likely to slag is fundamentally solved.

Description

technical field [0001] The invention belongs to the technical field of boiler combustion state control, and in particular relates to a fly ash anti-slagging system and method near a water wall of a four-corner tangential boiler. Background technique [0002] The problem of slagging in four-corner tangential boilers is common. If not properly solved, the heat transfer efficiency of the boiler will be reduced, the combustion will be deteriorated, and even accidents such as boiler fire extinguishing and shutdown will be caused. The steam coal used in most power plants is complex and changeable. During operation, the on-site operators do not have enough understanding of the combustion state in the furnace, and fail to make timely optimal operation adjustments in the face of complex and changeable coal types, resulting in more serious boiler slagging. [0003] Boiler slagging mechanism is very complex, the main physical process is: when the temperature in the furnace is high, a p...

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Problems solved by technology

[0004] In order to solve the problem of lack of anti-slagging means for operating and controlling four-corner tangentially round boilers in the prior art, the present invention provides a four-corner tangentially round boiler near water wall fly ash anti-slagging system and method

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