Air-combustion full premixing device of metal fiber low-nitrogen combustion device

Abstract

The invention provides an air-combustion full premixing device of a metal fiber low-nitrogen combustion device, aims at solving the technical problem of full premixing of air and fuel of an industrial combustor, and belongs to the technical field of combustors. The air-combustion full premixing device is characterized in that in a shell cavity, the inner side face of an air inlet end and the large-diameter edge of a conical shrink mouth of an air inlet are fixedly welded, and the conical shrink mouth of the air inlet, a conical expansion mouth of an air outlet, a cyclone and a conical shrink mouth flow guiding part are coaxially arranged and sequentially and fixedly connected; the periphery of an outer ring of the cyclone is fixedly welded to the inner side face of a shell; the conical surface of the conical shrink mouth of the air inlet is provided with multiple small fuel gas jetting holes; the central axis of a fuel gas inlet pipe and the central axis of the shell are perpendicular to each other, and the fuel gas inlet pipe penetrates through the shell wall to enter an annular space jointly formed by the shell, the conical shrink mouth of the air inlet and the conical expansion mouth of the air outlet in an enclosing mode. The air-combustion full premixing device has the advantages that the structure is simple, scientific and reasonable, full premixing of the air and the combustible gas is enhanced through a three-stage mixing mode, and therefore the very high practicability and creativity are achieved.

Description

technical field [0001] The invention relates to the technical field of burners, in particular to an air-fired full premixer of a metal fiber low-nitrogen combustion device which is conducive to sufficient premixing of air and fuel to achieve an optimal premixing state. Background technique [0002] At present, most of the known industrial burners use non-premixed and semi-premixed burners for air and fuel. Mixed and semi-premixed combustion methods have been unable to meet the current national emission standards. As an improvement, a complete premixed combustion method has been produced: after the air and fuel enter the combustion equipment separately, or the method of burning while mixing, or the method of mixing air and gas fuel to become a combustible gas before ignition and combustion, but it is impossible to control the local combustion. The existence of the high temperature zone cannot avoid incomplete combustion, and the flame is long and unevenly distributed, result...

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Problems solved by technology

[0002] At present, most of the known industrial burners use non-premixed and semi-premixed burners for air and fuel. Mixed and semi-premixed combustion methods can no longer meet the current national emission standards

As an improvement, a complete premixed combustion method has been produced: after the air and fuel enter the combustion equipment separately, or the method of burning while mixing, or the method of mixing air and gas fuel to become a combustible gas before ignition and combustion, but it is impossible to control the local combustion. The existence of the high temperature zone cannot avoid incomplete combustion, and the flame is long and unevenly distributed, resulting in a large amount of NOx and CO. It is still difficult to meet the country's ever-increasing requirements for environmental protection and energy saving and emission reduction. Some combustion methods are further improved

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