Opposed firing structure of boiler

Abstract

The invention discloses an opposed firing structure of a boiler. The opposed firing structure comprises a hearth, wherein the hearth is formed by enclosing of a boiler left-side wall, a boiler right-side wall, a boiler front wall and a boiler rear wall; left-side wall burners are distributed on the middle line of the boiler left-side wall along the height direction of the hearth; right-side wall burners are distributed on the middle line of the boiler right-side wall along the height direction of the hearth; a plurality of rows of front-wall burners are distributed on the boiler front wall; a plurality of rows of rear-wall burners are distributed on the boiler rear wall; and the peripheries of the boiler left-side wall, the boiler right-side wall, the boiler front wall and the boiler rear wall are provided with bellows for providing secondary air and over-fired air for the hearth. The opposed firing structure disclosed by the invention has the advantage that on the basis of not influencing the original coal-powder burning mode, the problem of corrosion caused by high temperature of water cooling walls of the side walls is thoroughly solved.

Description

technical field [0001] The invention belongs to the field of boilers, and in particular relates to a boiler opposed combustion structure. Background technique [0002] With the large-scale implementation of high-parameter and large-capacity thermal power units, thermal power technology has ushered in new opportunities for development, and at the same time new technical problems have emerged. In order to meet environmental protection emission requirements and reduce the operating pressure of the tail denitrification system, most of the newly commissioned units adopt low-nitrogen combustion technology to control the formation of nitrogen oxides. The low-nitrogen combustion method is to set an overfired air nozzle above the main burner area, and a part of the secondary air is sent into the furnace through the overfired air nozzle. The main burner area is an oxygen-deficient combustion, and the combustion temperature is reduced, thereby suppressing nitrogen oxides. generate. ...

AI Technical Summary

Problems solved by technology

However, this passive protective measure cannot fundamentally solve the problem of high-temperature corrosion. On the contrary, the peeling off of the anti-corrosion coating increases the risk of water-cooled wall operation and increases the workload of boiler maintenance.

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