CN205137451U - Force to draw low NOx gas combustion ware of penetrating flue gas backward flow - Google Patents

Force to draw low NOx gas combustion ware of penetrating flue gas backward flow Download PDF

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Publication number
CN205137451U
CN205137451U CN201520266417.2U CN201520266417U CN205137451U CN 205137451 U CN205137451 U CN 205137451U CN 201520266417 U CN201520266417 U CN 201520266417U CN 205137451 U CN205137451 U CN 205137451U
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China
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air
spout
flue gas
gas
burner
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Expired - Fee Related
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CN201520266417.2U
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Chinese (zh)
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王中
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王中
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Abstract

The utility model discloses a force to draw low NOx gas combustion ware of penetrating flue gas backward flow, through the negative pressure of utilizing high -speed air current to form in the venturi throat, the air is sneaked into to suction burning flue gas from the flue gas pump orifice, forms a general mood stream of low oxygen concentration, blows out from a wind spout, mixes and burns with the gas of gas spout spun. Oxygen concentration in wind is less than ordinary air. Simultaneously, the extraction mouth that draws the flue gas penetrated is located between gas spout and the axis, because pumping action will make the flue gas flow back to burner port, and like this can be in central recirculation region of flame kernel formation.

Description

A kind of low NO forcing injection smoke backflow xgas burner
One, technical field
The invention belongs to field of combustion technology, relate to a kind of low NOx gas burner, relate to a kind of First air spout using high-speed jet and Venturi tube to coordinate further, be ejected into jet-flow from the near axis region suction backflow flue gas of burner, form the low NOx gas burner of low oxygen concentration combustion flame.
Two, background technology
According to low NOx combustion principle, the technical essential that gas burner will realize low NOx combustion has two.The first, the temperature of burning higher than 1500 DEG C, if ignition temperature is higher than 1500 DEG C, can not can generate the NOx of heating power type in a large number; The second, the key reaction region of burning should oxygen concentration lower, preferably slightly oxygen debt reducing atmosphere is so just nitrogen by the effect of reduction NOx conversion, the generation of containment all kinds NOx.And in order to realize the thinking of these two low NOx combustions, use the mode of flue gas recirculation, flue gas very low for oxygen content after burning is drawn into the key reaction district in flame, the oxygen concentration of reaction zone main in flame is reduced, the temperature of burning so both can have been made to be controlled in lower level, also burning can be made to carry out in reducing atmosphere, thus realize low NOx combustion.
Three, summary of the invention
According to the thinking of above-mentioned low NOx combustion, the object of the invention is to, a kind of low NOx gas burner of the high speed First air spout with Venturi tube injector is provided, gas medium in injection spout is the First air of flow velocity between 40 ~ 340m/s, by the negative pressure that Venturi tube is formed, force to extract flue gas from the near axis region of burner with flue gas pump orifice, oxygen concentration in the gas that First air spout is sprayed significantly reduces, then burner hearth is sprayed into, and combustion gas spout correspondence is arranged in the inner side of First air spout, the air-flow that whole burner nozzle sprays forms the form of " bellows chamber gas ", and, oxygen concentration in First air is lower than common air.Simultaneously, the extraction opening of the flue gas of injection is between combustion gas spout and axis, because swabbing action will make flue gas reflux to burner nozzle, such meeting forms a Central backflow area at flame kernel, there are two effects this recirculating zone, first effect makes high temperature gases recirculating in flame near spout, help to ignite fresh combustion gas, thus realize the stability of burning, second effect is the state keeping oxygen concentration on the low side near making burner nozzle, thus promotes the high-efficient low polluting combustion of combustion gas.
To achieve these goals, technical scheme of the present invention is: First air spout is arranged on outside combustion gas spout, First air spout is provided with Venturi tube, Venturi tube is connected to flue gas pump orifice, extracting combustion flue gas from flue gas pump orifice, is mixed in air, forms the First air air-flow of low oxygen concentration, spray from First air spout, the combustion gas mixing sprayed with combustion gas spout is also burnt.The effect of flue gas pump orifice is the region extraction flue gas of near axis from burner nozzle, and is blended in First air.First air spout is with Venturi tube injector, the flow velocity of First air in pipe is between 50 ~ 340m/s, the air quantity of First air accounts for 60 ~ 99% (namely total excess air coefficient of First air is 0.6 ~ 0.99) of the required theoretical air requirement of burning, the oxygen amount not only making First air provide is slightly not enough, form reducing atmosphere, also ensure that the oxygen concentration of the air-flow that First air ejects itself is just lower than 21% simultaneously.Burn the flue gas generated, and a part is drawn back by fume gas extraction port in the region of the near axis of burner, enters the flow process of recirculation, and the downstream that another part flue gas then flows to flame is discharged.
The present invention uses the First air spout with Venturi tube, flue gas pump orifice is utilized to force to extract flue gas from the axis region of burner, oxygen concentration in the gas that spout is sprayed significantly reduces, thus ignition temperature is effectively controlled, and utilize the recirculating zone at center to maintain the reproducibility high-temperature area of flame root, meet the demand of steady combustion and low NOx combustion, to realize stable low NOx combustion simultaneously.
Four, accompanying drawing explanation
Fig. 1 sectional view that to be the present invention force the gas burner of the First air spout of drawing smoke to be cut open from axis with Venturi tube.
Fig. 2 is that the present invention forces the gas burner of the First air spout of drawing smoke from spout, point to the view in direction in spout with Venturi tube.
Fig. 3 is the 3 dimensional drawing of burner nozzle of the present invention.
Fig. 4 is the 3 dimensional drawing that burner spout of the present invention is cut open from axis.
Five, detailed description of the invention
For a more clear understanding of the present invention, the present invention is described in further detail for the embodiment completed below in conjunction with accompanying drawing and inventor.
See Fig. 1, Fig. 2, Fig. 3, Fig. 4.Fig. 1 sectional view that to be the present invention force the gas burner of the First air spout of drawing smoke to be cut open from axis with Venturi tube.
According to technical scheme of the present invention, First air spout (4) is arranged on outside combustion gas spout (2), the two is axial symmetry circumference all, First air spout is provided with Venturi tube (3), Venturi tube is connected to flue gas pump orifice (1), extracting combustion flue gas from flue gas pump orifice, be mixed in air, form the First air air-flow of low oxygen concentration, spray from First air spout, the combustion gas mixing sprayed with combustion gas spout is also burnt.Combustion gas spout (2) axial symmetry circumference, First air spout (4) also axial symmetry circumference be positioned at the periphery of combustion gas spout (2), with Venturi tube (3) in First air spout, the throat structure of Venturi tube can be utilized to promote air velocity and to form negative pressure, the flue gas outside spout is extracted by flue gas pump orifice (1), be mixed in the air of First air, form the First air air-flow of low oxygen concentration, spray from First air spout (4), the combustion gas mixing sprayed with combustion gas spout (2) is also burnt, flue gas pump orifice (1) uses axial symmetry circumference equally, be positioned between combustion gas spout (1) and axis, it is the secondary air channel (6) of annular outside First air spout, separate with enlarging (5) with managing in Secondary Air between secondary air channel (6) and First air spout (4), Secondary Air outer tube (7) is positioned at the outermost of whole burner, angle α between First air spout axis and burner axis 1the angle α of=-45 ° ~+45 ° flue gas pump orifice axis and burner axis 0=-45 ° ~+45 °, the angle α of combustion gas spout and burner axis f=-45 ° ~+45 °, the wherein negative number of degrees represent that the axis direction of burner is pointed in the direction of spout, the positive number of degrees represent that the direction away from burner axis is pointed in the direction of spout, spout group being circumferentially evenly arranged at burner of three kinds of spout compositions, angle θ=5 ~ 180 ° at interval between every two spout groups.The air capacity that Secondary Air provides accounts for 1 ~ 60% of the theoretical air requirement needed for burning, makes total excess air coefficient of First air and Secondary Air between 1 ~ 1.2.
Its principle is as follows:
(1) arrange combustion gas spout at the axis of gas burner, combustion gas spout is uniform (the present embodiment is 16 combustion gas spouts) circumferentially, combustion gas is divided into shallow bid, is comparatively evenly distributed in the region outside burner nozzle.
(2) the corresponding combustion gas spout of First air spout, circumferentially be distributed on (the present embodiment is 16 First air spouts) outside combustion gas spout, air is also divided into shallow bid, is comparatively evenly distributed in the region outside burner nozzle, mix in space with combustion gas after ejection.
(3) every root First air passage arranges a Venturi tube, the throat structure of Venturi tube is utilized to improve air velocity, thus formation negative pressure, utilize this negative pressure, mix with the air in First air Venturi tube from flue gas pump orifice extracting combustion flue gas, form the gaseous mixture of oxygen concentration lower than normal air (oxygen concentration 21%), and spray from spout.Because the medium of First air ejection is actually the lower air of oxygen concentration and smoke mixture, so, and the combustion reaction intensity between combustion gas reduces, and the temperature of burning can reduce, and controls, to avoid the generation of thermal NO x at 1500 DEG C once.
(4) flue gas pump orifice is between combustion gas spout and axis, the flue gas of flame kernel is refluxed to burner nozzle direction, this backflow will bring two kinds of effects, the first effect is the smoke backflow district making to exist near burner nozzle a high temperature, heat can be provided for catching fire of fresh combustion gases, help combustion gas stable ignition.The second effect makes the central area of flame be oxygen debt reducing atmosphere all the time, contributes to reducing the NOx generated, realize low NOx drainage.
(5) outside First air spout be annular overfire air port, secondary air channel is a complete circular passage, 1 ~ 60% of the theoretical air requirement needed for burning is provided in combustion gas, make total excess air coefficient of First air and Secondary Air between 1 ~ 1.2, realize the balance of integral combustion oxygen amount and fuel quantity, ensure the total oxygen demand needed for combustion gas after-flame.
(6) between overfire air port and First air spout, enlarging is set, the object that exists of enlarging regulates the morning and evening mixed between Secondary Air and main flame, the delay realizing Secondary Air is mixed into, main like this flame can in oxygen debt reducing atmosphere Thorough combustion, after finally postponing to allocate Secondary Air into, abundant after-flame under lower ignition temperature and lower oxygen concentration condition, avoids the generation of NOx equally.
(7) the many parameters in the present invention, as the angle α of First air and axis 1, the angle α of flue gas suction tube and axis 0, the angle α of combustion gas spout and axis f, the angle θ at interval between every two groups of spouts, and First air air quantity, Secondary Air air quantity, Secondary Air enlarging angle all can change, and carries out corresponding adjustment to different combustion conditions.
The present invention is mainly suitable for the gas burner as low NOx drainage, and structure is simple, and easy to manufacture, modulability is good, can extensive use on the various equipment of operating on gaseous fuel, realizes high-efficient low polluting combustion.

Claims (2)

1. a gas burner, it is characterized in that: comprise combustion gas spout (2) and First air spout (4), First air spout is arranged on outside combustion gas spout, First air spout is provided with Venturi tube (3), Venturi tube is connected to flue gas pump orifice (1), extracting combustion flue gas from flue gas pump orifice, be mixed in air, form the First air air-flow of low oxygen concentration, spray from First air spout, the combustion gas mixing sprayed with combustion gas spout is also burnt.
2. gas burner according to claim 1, it is characterized in that: combustion gas spout (2) axial symmetry circumference, First air spout (4) also axial symmetry circumference be positioned at the periphery of combustion gas spout (2), with Venturi tube (3) in First air spout, the throat structure of Venturi tube can be utilized to promote air velocity and to form negative pressure, the flue gas outside spout is extracted by flue gas pump orifice (1), be mixed in the air of First air, form the First air air-flow of low oxygen concentration, spray from First air spout (4), the combustion gas mixing sprayed with combustion gas spout (2) is also burnt, flue gas pump orifice (1) uses axial symmetry circumference equally, be positioned between combustion gas spout (1) and axis, it is the secondary air channel (6) of annular outside First air spout, separate with enlarging (5) with managing in Secondary Air between secondary air channel (6) and First air spout (4), Secondary Air outer tube (7) is positioned at the outermost of whole burner, angle α between First air spout axis and burner axis 1=-45 ° ~+45 °, the angle α of flue gas pump orifice axis and burner axis 0=-45 ° ~+45 °, the angle α of combustion gas spout and burner axis f=-45 ° ~+45 °, the wherein negative number of degrees represent that the axis direction of burner is pointed in the direction of spout, the positive number of degrees represent that the direction away from burner axis is pointed in the direction of spout, spout group being circumferentially evenly arranged at burner of three kinds of spout compositions, angle θ=5 ~ 180 ° at interval between every two spout groups.
CN201520266417.2U 2015-04-29 2015-04-29 Force to draw low NOx gas combustion ware of penetrating flue gas backward flow Expired - Fee Related CN205137451U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106233917A (en) * 2016-08-04 2016-12-21 杨进 It is easy to the hay mover of spraying medicine
CN110869673A (en) * 2017-07-21 2020-03-06 库珀斯解决方案有限公司 Burner with a burner head

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106233917A (en) * 2016-08-04 2016-12-21 杨进 It is easy to the hay mover of spraying medicine
CN110869673A (en) * 2017-07-21 2020-03-06 库珀斯解决方案有限公司 Burner with a burner head

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20160406

Termination date: 20170429

CF01 Termination of patent right due to non-payment of annual fee