Method and device for determining opposite firing air supply quantity and automatic control system

Abstract

The invention provides a method and a device for determining opposite firing air supply quantity and an automatic control system, and belongs to the technical field of burner operation air quantity control. The method comprises the following steps: determining opposite firing operation oxygen quantity, primary burning area excess air coefficient and burnout air quantity distribution coefficient of each layer of burnout air bellow; and determining the opposite firing air supply quantity according to the total fuel quantity fed by furnace walls where the burnout air bellows are located, the analysis data of preboiler coal grade, as well as the opposite firing operation oxygen quantity, the primary burning area excess air coefficient and the burnout air quantity distribution coefficients. The opposite firing air supply quantity is determined through the total fuel quantity fed by the furnace walls where the burnout air bellows are located, the analysis data of preboiler coal grade, as well as the opposite firing operation oxygen quantity, the primary burning area excess air coefficient and the burnout air quantity distribution coefficients, so that the air supply quantity in the low-NOx opposite firing process is automatically controlled in the boiler operation process, and low-level NOx concentration at a furnace outlet can also be maintained while high efficient combustion is guaranteed.

Description

technical field [0001] The invention relates to a method, a device and an automatic control system for determining the intake air volume of a counter-combustion, and belongs to the technical field of burner operation air volume control. Background technique [0002] At present, the combustion methods in large pulverized coal combustion boilers mainly include four-corner tangential combustion and front and rear walls opposing combustion. Due to its advantages in combustion stability and heating surface arrangement, the front and rear wall opposed combustion boiler has become the main combustion method adopted by supercritical boilers. In the opposite combustion mode of the front and rear walls, the swirl burners are arranged on the water-cooled walls of the front wall and the rear wall of the furnace, and each burner organizes air distribution independently, and the flames are relatively independent; the flames of the burners on the same wall are separated Without interferin...

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Problems solved by technology

[0006] The present invention solves the existing low NO x The existence of the opposite combustion technology cannot determine the low NO according to the total amount of fuel fed into the furnace wall x In order to solve the problem of the burnout air volume of the counter-combustion boiler, a method, device and automatic control system for determining the air intake volume of the counter-combustion boiler are proposed, including the following technical solutions:

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