Novel secondary air system for opposed firing boiler and working method thereof

Abstract

The invention discloses a novel secondary air system for an opposed firing boiler and a working method thereof. A secondary air layer pipeline is connected with a secondary air box through a secondaryair branch pipe, and a flare is arranged between the secondary air branch pipe and the secondary air box; one end of the secondary air layer pipeline is connected with an A side secondary air main pipeline, and the other end of the secondary air layer pipeline is connected with a B side secondary air main pipeline; a combustor is provided with a central air pipe, a primary air pipe, an outer secondary air door and an inner secondary air door, wherein the outer secondary air door is arranged in the middle of the combustor, the inner secondary air door is arranged at the inner side of the outersecondary air door, the central air pipe is partially sleeved with the primary air pipe, and the primary air pipe is arranged at the inner side of the inner secondary air door; and the secondary airbox communicates with a hearth through the combustor. By supplying air from the bottom of the secondary air box innovatively, no ash is accumulated at the bottom of the secondary air box; and by supplying air from the bottom of the secondary air box respectively through the plurality of secondary air branch pipes, the problem of uneven flow distribution of the secondary air box of an opposed firing combustion system is effectively solved.

Description

technical field [0001] The invention relates to a novel secondary air system and its working method for opposing combustion boilers. Background technique [0002] In the current counter-fired boiler, the secondary air is fed by a public air box, and the secondary air box is divided into a front air box and a rear air box, and the front and rear air boxes are divided into small air boxes according to the number of burner layers, that is, each layer of Share a bellows, the shape of the bellows is cuboid, due to the air intake from both sides of each layer of small bellows, the pressure distribution along the width direction of the bellows is uneven (high pressure in the middle, small pressure on both sides), resulting in the burner in the middle part being in an oxygen-enriched combustion state , the emission concentration of nitrogen oxides is very high, the burners on both sides are in the state of oxygen-deficient combustion, and the high-temperature corrosion is very serio...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a new type of secondary air system and its working method for opposing combustion boilers, which innovatively adopts the bottom air intake of the secondary air box to realize secondary air flow. There is no dust accumulation at the bottom of the air box, and several secondary air branch pipes are used to enter the air from the bottom of the secondary air box respectively, which is conducive to the uniform distribution of the secondary air and effectively solves the problem of uneven flow distribution of the secondary air box in the counter combustion system

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