Furnace bottom air supplement type opposed firing pulverized coal furnace

Abstract

The invention discloses a furnace bottom air supplement type opposed firing pulverized coal furnace. The furnace bottom air supplement type opposed firing pulverized coal furnace comprises a furnace body (1), a main combustion area (2) located in the furnace body (1), a dry bottom hopper (3) located at the bottom of the furnace body (1), a combustor (4) and an over fire air nozzle (5), the combustor (4) and the over fire air nozzle (5) are arranged on the furnace body (1), and the combustor (4) is located below the over fire air nozzle (5). A plurality of air supplementing nozzles (6) are mounted on the wall surface between the dry bottom hopper (3) and the main combustion area (2); and sprayed air enters the bottom of the furnace body (1) through the air supplementing nozzles (6). According to the furnace bottom air supplement type opposed firing pulverized coal furnace, collaborative optimization of the pulverized coal burn-off rate, high-temperature corrosion of the dry bottom hopper and nitrogen oxide emission is achieved, and good economic benefits and environmental benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of combustion of pulverized coal boilers, in particular to a pulverized coal boiler of a furnace-bottom supplementary air type counter-combustion pulverized coal boiler. Background technique [0002] In coal-fired boilers, the opposite combustion method is a widely used pulverized coal combustion method. The burners are arranged on the front and rear walls, the burners are facing each other, and a flame is formed at the burner outlet. Swirl burners are generally used for counter combustion, and the primary and secondary air and fuel are mixed and burned at the burner outlet. Counter-firing burners generally do not have an angle adjustment function. With the continuous increase in the demand for deep peak regulation of the unit, when the unit is running at low load, problems such as high carbon content in the slag, thin slag and unformed slag, and high-temperature corrosion of the cold ash hopper frequently ...

AI Technical Summary

Problems solved by technology

When the unit is under low load, although the pulverized coal ejected from the bottom burner has a long residence time, the oxygen supply condition at the bottom of the furnace is poor, and the temperature at the bottom of the furnace is low, which greatly weakens the burnout of the pulverized coal

In addition, due to air classification, the amount of air injected into the bottom of the furnace is insufficient, and the lifting force of the pulverized coal at the outlet of the bottom burner is insufficient, resulting in a large amount of unburned pulverized coal settling to the bottom of the furnace

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