CN105042591B - Low NOx gas burners and its gas collocation method - Google Patents

Low NOx gas burners and its gas collocation method Download PDF

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Publication number
CN105042591B
CN105042591B CN201510410890.8A CN201510410890A CN105042591B CN 105042591 B CN105042591 B CN 105042591B CN 201510410890 A CN201510410890 A CN 201510410890A CN 105042591 B CN105042591 B CN 105042591B
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China
Prior art keywords
gas
ring
air
cylinder
combustion zone
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CN201510410890.8A
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Chinese (zh)
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CN105042591A (en
Inventor
王丽辉
车立新
方媛媛
朱禹洲
Original Assignee
北京市公用事业科学研究所
北京市燕山工业燃气设备有限公司
北京公用事业科技发展公司
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Priority to CN201510410890.8A priority Critical patent/CN105042591B/en
Publication of CN105042591A publication Critical patent/CN105042591A/en
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Publication of CN105042591B publication Critical patent/CN105042591B/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46Details, e.g. noise reduction means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46Details, e.g. noise reduction means
    • F23D14/60Devices for simultaneous control of gas and combustion air

Abstract

A kind of low NOx gas burners and its gas collocation method, wherein burner includes the inner cylinder and outer barrel being coaxially disposed, and it is arranged on the outer ring gas spray head communicated with gas pipeline between inner cylinder and outer barrel, the center of the inner cylinder is provided with the central tube of conveying air and combustion gas mixing gas, inner ring combustion gas sleeve is cased with central tube, and the inner ring blast tube communicated with gas pipeline is surrounded by between inner ring combustion gas sleeve and central tube, the inner ring gas jet orifice of the radial direction communicated with inner ring blast tube is also provided with the week side of boss wall of upper end four of inner ring combustion gas sleeve, space on the inside of the inner cylinder is inner ring combustion zone, between the outer barrel and inner cylinder, space above the gas spray head of outer ring is outer ring combustion zone.This burner and its gas collocation method can make flame temperature reduce and reduce the oxygen in combustion air to be combined with nitrogen and nitrogen-containing group, so as to effectively inhibit the generation of NOx, emission limits of nitrogen oxides is less than 60 mg/m3

Description

Low NOx gas burners and its gas collocation method

Technical field

The present invention relates to combustion with reduced pollutants technical field, more particularly to one kind can reduce flame temperature and burner injection fires Burn the gas burner and its gas collocation method of indoor flue gas.

Background technology

In recent years, haze has turned into grave danger of publilc health, and nitrogen oxides is the main composition of haze, controls nitrogen oxygen The discharge of compound has turned into the important measure for administering haze weather.With Energy restructuring, natural gas energy resource proportion significantly increases Plus, the situation that fuel gas buring discharge nitrogen oxides is polluted increasingly attracts attention, and country has promulgated《Boiler atmosphere pollution Discharge》Discharged nitrous oxides have been formulated strict index by new standard, and some key areas will formulate stricter index, Such as Beijing is 80 mg/m to gas fired-boiler emission limits of nitrogen oxides3(Benchmark oxygen content 3.5%).

Fuel gas buring produces NOx to belong to heating power type, produce NOx number depending on flame temperature, flame temperature and burner hearth Liberation is relevant, the gas fired-boiler of the gas fired-boiler larger for furnace heat release, such as thermal power less than 14MW, stove Thorax volume is relatively small, and heat exchange area is few, is unfavorable for reducing flame temperature.So, emission limits of nitrogen oxides is less than 80 mg/m3(Benchmark oxygen content 3.5%), burner only with reduce flame temperature technical measures be not enough to depth suppress nitrogen oxidation The formation of thing, therefore, how it is more efficient suppress nitrogen oxides formation, in addition it is also necessary to further research.

The content of the invention

Meet existing relevant national standard and less than 60 mg/m it is an object of the invention to provide a kind of discharged nitrous oxides3 (Benchmark oxygen content 3.5%)Low NOx gas burners and its gas collocation method, to solve traditional gas burner and suppress The technical problem of the effect on driving birds is not good that nitrogen oxides is formed.

To achieve the above object, the present invention is adopted the following technical scheme that:A kind of low NOx gas burners, include coaxial The inner cylinder and outer barrel of setting and the outer ring gas spray head communicated with gas pipeline being arranged between inner cylinder and outer barrel, it is special Levy and be:

The center of the inner cylinder is provided with the central tube of conveying air and combustion gas mixing gas.

Inner ring combustion gas sleeve is cased with the central tube, and is surrounded by and combustion gas between inner ring combustion gas sleeve and central tube The inner ring blast tube that pipeline is communicated, is also provided with the week side of boss wall of upper end four of inner ring combustion gas sleeve and is communicated with inner ring blast tube Radial direction inner ring gas jet orifice.

Space on the inside of the inner cylinder is inner ring combustion zone, between the outer barrel and inner cylinder, above the gas spray head of outer ring Space is outer ring combustion zone.

Preferably, air distributor is cased with the inner ring combustion gas sleeve below the inner ring gas jet orifice, air distribution Device includes the air distribution plate of a circle, and the inner cylinder is arranged on the air distribution plate, and the inner cylinder is arranged on air distribution On plate.Through hole is evenly equipped with air distribution plate on the inside of the inner cylinder, the inner ring combustion zone is by through hole and air distribution plate The space of lower section communicates.Circumferential weld is left between the air distribution plate and outer barrel, the outer ring combustion zone passes through circumferential weld and air Space below distribution plate communicates.

Preferably, guiding air flow is provided with above the through hole is in the eddy flow leaf of an angle with air distribution plate Stitched by the eddy flow formed by through hole and swirl vane and communicated with the space below air distribution plate in piece, the inner ring combustion zone. The swirl vane is 30 °~45 ° with the angle of air distribution plate.

Preferably, at least one circle perforation for extracting flue gas in combustion chamber, perforation are circumferentially provided with the outer barrel Inner side be provided with again guiding flue gas flow direction from bottom to top to the inclined injection piece in outer barrel axle center.The injection piece and outer barrel Angle is 30 °~60 °.

Preferably, the outer ring gas spray head is higher than inner ring gas jet orifice, between outer barrel and inner cylinder, the gas spray head of outer ring Lower section is provided with outer ring combustion air passage, and the outer ring combustion zone is by outer ring combustion air passage and circumferential weld and air distribution plate The space of lower section communicates.

Preferably, the top of the outer barrel is higher than outer ring gas spray head, and outer ring gas spray head is higher than the top of inner cylinder, inner cylinder Top be higher than inner ring gas jet orifice.

A kind of gas collocation method of low NOx gas burners, it is characterised in that:Combustion gas stream in the inner ring combustion zone Amount accounts for the 25%~30% of total gas flow, and the air mass flow in the inner ring combustion zone accounts for the 10%~20% of total air mass flow, institute The gas flow in the combustion zone of outer ring accounts for total gas flow 70%~75% is stated, the air mass flow in the combustion zone of the outer ring is accounted for always The 80%~90% of air mass flow.

The 5%~10% of the gas flow that the gas flow that the central tube sprays can be accounted in inner ring combustion zone,;The center The 15%~20% of the air mass flow that the air mass flow that pipe sprays can be accounted in inner ring combustion zone.

Compared with prior art the invention has the characteristics that and beneficial effect:The invention provides a kind of nitrogen oxides row Limit value is put less than 60 mg/m3(Benchmark oxygen content 3.5%)Gas burner, can reduce flame temperature and reduce combustion-supporting sky Oxygen in gas is combined with nitrogen and nitrogen-containing group, so as to effectively inhibit the generation of NOx, reduces the discharge of NOx.

In the present invention, central tube conveys air and combustion gas mixing gas(Some gases and air pre-mixing gas)Into inner ring combustion Area is burnt, combustion gas enhances burning with air pre-mixing, it is ensured that flame does not take off fire.

In the present invention, the inner space of inner cylinder constitutes inner ring combustion zone, and inner ring combustion air forms rotation after eddy flow is stitched Turn air-flow, the multiply combustion gas thread that swirling eddy radially sprays with inner ring gas jet orifice mixes, and enhances air and combustion gas mixing, Shorten residence time of the flue gas in high-temperature region.

In the present invention, outer ring combustion air is axially sprayed by outer ring combustion air passage and multiple outer rings gas spray head Combustion gas stream mixes, and outer ring combustion zone is made up of multiple flames, increased flame area of dissipation, advantageously reduces flame temperature.

The present invention is additionally provided with perforation and injection piece on outer barrel, and the mixed gas of air and combustion gas spray from outer barrel When, negative pressuren zone is formed at perforation, flue gas is inhaled into combustion zone along injection piece by entering perforation in combustion chamber.

The present invention is additionally provided with air distributor, the air distributor compared with traditional cyclone, not only simple structure, easily In processing, and both functions with cyclone, air swirl can be made, and with the function of distribution air, can be by air Accurately distribute according to need into the inner ring combustion zone and outer ring combustion zone of combustion gas gas apparatus, form two kinds of gas of different flow directions Stream, solving in existing gas burner does not have air distributor, it is impossible to air accurately is sent into asking for each combustion zone Topic.Air is accurately sent into each combustion zone by the present invention by air distributor, can further reduce the nitrogen of gas burner The discharge capacity of oxide.

In the present invention, the gas flow in inner ring combustion zone accounts for the 25%~30% of total gas flow, in inner ring combustion zone Air mass flow accounts for the 10% of total air mass flow, and the gas flow in the combustion zone of outer ring accounts for the 70%~75% of total gas flow, outer ring combustion The air mass flow burnt in area accounts for the 80%~90% of total air mass flow.Inner ring combustion zone excess air coefficient is less than 1.0, is dense combustion Burn, outer ring combustion zone excess air coefficient is more than 1.2, is light burning, the combination of inside and outside circle bias combustion and outer ring combustion zone Multiple flames, reduce flame temperature.

The present invention is burnt using inside and outside circle, and the dense burning of inner ring, the light burning in outer ring, while also on the basis of which On, flue gas in combustion chamber is introduced into combustion zone using perforation and injection piece, making the concentration of combustion zone oxygen reduces, and reduces combustion-supporting sky Oxygen in gas is combined with nitrogen and nitrogen-containing group, so as to effectively inhibit the generation of NOx, and then has reached only generation very small amount NOx, discharged nitrous oxides be less than 60 mg/m3(Benchmark oxygen content 3.5%)Effect.

Brief description of the drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings.

Fig. 1 is structural representation of the invention.

Fig. 2 is schematic top plan view of the invention.

Fig. 3 is the schematic diagram of A-A sections in Fig. 2.

Fig. 4 is the structural representation of outer barrel.

Reference:1- central tubes, 2- inner rings gas jet orifice, 3- air distribution plate, 4- swirl vanes, 5- inner cylinders, 6- outer rings gas spray head, 7- outer barrels, 8- injections piece, 9- inner rings combustion zone, 10- outer rings combustion airs passage, 11- rings Seam, 12- through holes, 13- perforations, 14- breach, 15- outer rings combustion zone, 16- inner ring combustion gas sleeve, 17- inner ring combustion gas Passage.

Specific embodiment

Embodiment referring to shown in Fig. 1-4, this low NOx gas burners, include the inner cylinder 5 that is coaxially disposed and outer barrel 7, And it is arranged on the outer ring gas spray head 6 communicated with gas pipeline between inner cylinder 5 and outer barrel 7, the shower nozzle of outer ring gas spray head 6 Top is equipped with 1 gas jet orifice.

The center of the inner cylinder 5 is provided with the central tube 1 of conveying air and combustion gas mixing gas.

It is cased with being surrounded by between inner ring combustion gas sleeve 16, and inner ring combustion gas sleeve 16 and central tube 1 on the central tube 1 The inner ring blast tube 17 communicated with gas pipeline, is also provided with the week side of boss wall of upper end four of inner ring combustion gas sleeve 16 and is fired with inner ring The inner ring gas jet orifice 2 of the radial direction that gas passage 17 is communicated.

Air distributor is cased with again on the inner ring combustion gas sleeve 16 of the lower section of the inner ring gas jet orifice 2, the air distributor Including a circular air distribution plate 3 being made up of heat-resisting steel sheet and plate, the inner cylinder 5 is arranged on air distribution plate 3, inner cylinder 5, Air distribution plate 3 is surrounded by inner ring circle combustion zone 9 with inner ring combustion gas sleeve 16.Correspondence outer ring combustion gas on the air distribution plate 3 The position of shower nozzle 6 is provided with breach 14 so that air distribution plate is discoid in lace.

The through hole 12 of strip is evenly equipped with the air distribution plate 3 of the inner side of the inner cylinder 5, the top of through hole 12 is provided with guiding again Air flow is in 30 °~45 ° swirl vanes 4 of angle with air distribution plate 3, and the inner ring combustion zone 9 is by by through hole 12 and swirl vane 4 formed eddy flow seam communicated with the space below air distribution plate.Eddy flow needed for the inner ring combustion zone 9 Combustion air be that the eddy flow of air below air distribution plate by being formed by through hole 12 and swirl vane 4 stitches and enters inner ring and fire Burn area 9.

The inner side of the outer barrel 7, the space of the top of outer ring gas spray head 6 are outer ring combustion zone 15, the air distribution plate 3 with Circumferential weld 11 is left between outer barrel 7, in the present embodiment, outer ring gas spray head 6 is higher than inner ring gas jet orifice 2, outer barrel 7 and inner cylinder 5 it Between, the lower section of outer ring gas spray head 6 be provided with outer ring combustion air passage 10, the outer ring combustion zone 15 passes through outer ring combustion air Passage 10 and circumferential weld 11 are communicated with the space below air distribution plate.Combustion air needed for the outer ring combustion zone 15 is air Air below distribution plate enters outer ring combustion zone 15 by circumferential weld 11.

At least one circle perforation 13 for extracting flue gas in combustion chamber is circumferentially provided with the present embodiment, on the outer barrel 7, The inner side of perforation 13 be provided with again guiding flue gas flow direction from bottom to top to the inclined injection piece 8 in outer barrel axle center, the injection Piece 8 is generally 30 °~60 ° with the angle of outer barrel 7.Additionally, in other embodiments, it is also possible on outer barrel design two circle, Three circles or more circle perforation.

Referring to Fig. 4, in the present embodiment, perforation 13 is arch hole.In other embodiments, it is also possible to be designed to semicircle Hole or square hole etc..

In the present embodiment, the top of outer barrel 7 is higher than outer ring gas spray head 6, and outer ring gas spray head 6 is higher than the top of inner cylinder 5, The top of inner cylinder 5 is higher than inner ring gas jet orifice 2.

Applicant has found that the low NOx gas burners use following combustion gas configuration mode, and using effect is most by studying It is good, the discharged nitrous oxides of gas burner can be made to be less than 60 mg/m3(Benchmark oxygen content 3.5%):The inner ring combustion zone 9 In gas flow account for the 25%~30% of total gas flow, the air mass flow in the inner ring combustion zone 9 accounts for total air mass flow 10%~20%, the gas flow in the outer ring combustion zone 15 accounts for the 70%~75% of total gas flow, the outer ring combustion zone 15 In air mass flow account for the 80%~90% of total air mass flow.

Additionally, the combustion gas accounted in inner ring combustion zone as most preferred embodiment, the gas flow that the central tube 1 sprays The 5%~10% of flow, the 15%~20% of the air mass flow that the air mass flow that the central tube 1 sprays is accounted in inner ring combustion zone.

In Fig. 1, hollow arrow represents air and combustion gas mixing gas, and solid arrow represents combustion gas, and dotted arrow represents empty Gas.

Claims (6)

1. a kind of low NOx gas burners, include the inner cylinder being coaxially disposed(5)And outer barrel(7)And it is arranged on inner cylinder(5) With outer barrel(7)Between the outer ring gas spray head communicated with gas pipeline(6), it is characterised in that:
The inner cylinder(5)Center be provided with the central tube of conveying air and combustion gas mixing gas(1);
The central tube(1)On be cased with inner ring combustion gas sleeve(16), and inner ring combustion gas sleeve(16)With central tube(1)Between enclose The inner ring blast tube that Cheng Youyu gas pipelines are communicated(17), inner ring combustion gas sleeve(16)The week side of boss wall of upper end four on be also provided with With inner ring blast tube(17)The inner ring gas jet orifice of the radial direction for communicating(2);
The inner cylinder(5)The space of inner side is inner ring combustion zone(9), the outer barrel(7)With inner cylinder(5)Between, outer ring gas injection Head(6)The space of top is outer ring combustion zone(15);
The inner ring gas jet orifice(2)The inner ring combustion gas sleeve of lower section(16)On be cased with air distributor, the air distributor bag Include the air distribution plate of a circle(3), the inner cylinder(5)It is arranged on the air distribution plate(3)On;
The inner cylinder(5)The air distribution plate of inner side(3)On be evenly equipped with through hole(12), the inner ring combustion zone(9)By through hole (12)Communicated with the space below air distribution plate;
The air distribution plate(3)With outer barrel(7)Between leave circumferential weld(11), the outer ring combustion zone(15)By circumferential weld(11) Communicated with the space below air distribution plate;
The through hole(12)Top be provided with guiding air flow with air distribution plate(3)In the swirl vane of an angle (4), the inner ring combustion zone(9)By by through hole(12)And swirl vane(4)The eddy flow seam of formation and air distribution plate lower section Space communicate;
The outer barrel(7)On be circumferentially provided with extract combustion chamber in flue gas at least one circle perforation(13), perforation(13) Inner side be provided with again guiding flue gas flow direction from bottom to top to the inclined injection piece in outer barrel axle center(8);
The outer barrel(7)Top be higher than outer ring gas spray head(6), outer ring gas spray head(6)Higher than inner cylinder(5)Top, it is interior Cylinder(5)Top be higher than inner ring gas jet orifice(2).
2. low NOx gas burners according to claim 1, it is characterised in that:The swirl vane(4)Distributed with air Plate(3)Angle be 30 °~45 °.
3. low NOx gas burners according to claim 1, it is characterised in that:The injection piece(8)With outer barrel(7)'s Angle is 30 °~60 °.
4. low NOx gas burners according to claim 1, it is characterised in that:The outer ring gas spray head(6)Higher than interior Circle gas jet orifice(2), outer barrel(7)With inner cylinder(5)Between, outer ring gas spray head(6)Lower section be provided with outer ring combustion air passage (10), the outer ring combustion zone(15)By outer ring combustion air passage(10)And circumferential weld(11)With the sky below air distribution plate Between communicate.
5. a kind of gas collocation method of the low NOx gas burners in Claims 1-4 described in any one, its feature It is:The inner ring combustion zone(9)In gas flow account for the 25%~30% of total gas flow, the inner ring combustion zone(9)In Air mass flow account for the 10%~20% of total air mass flow, the outer ring combustion zone(15)In gas flow account for total gas flow 70%~75%, the outer ring combustion zone(15)In air mass flow account for the 80%~90% of total air mass flow.
6. the gas collocation method of low NOx gas burners according to claim 5, it is characterised in that:The central tube (1)The 5%~10% of the gas flow that the gas flow of ejection is accounted in inner ring combustion zone;The central tube(1)The air stream of ejection The 15%~20% of the air mass flow that amount is accounted in inner ring combustion zone.
CN201510410890.8A 2015-07-14 2015-07-14 Low NOx gas burners and its gas collocation method CN105042591B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105937769A (en) * 2016-07-09 2016-09-14 深圳智慧能源技术有限公司 Ejection type combustion device and protective covers thereof
WO2018010052A1 (en) * 2016-07-09 2018-01-18 深圳智慧能源技术有限公司 Injection combustion device and protection cover thereof
CN106196057A (en) * 2016-08-26 2016-12-07 中能服能源科技股份有限公司 A kind of novel low nitrogen oxide burner structure
JP2019045092A (en) * 2017-09-05 2019-03-22 トヨタ自動車株式会社 Nozzle structure for hydrogen gas burner device

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CN103162290A (en) * 2011-12-09 2013-06-19 株式会社能率 Rich-lean combustion burner and combustion apparatus
CN103900082A (en) * 2014-03-12 2014-07-02 宁波方太厨具有限公司 Bias burner
CN104633655A (en) * 2013-11-12 2015-05-20 韩国生产技术研究院 Ultra-low nitrogen oxide combustion apparatus using internal recirculation of combustion gas and method therefor
CN204786417U (en) * 2015-07-14 2015-11-18 北京市公用事业科学研究所 Urceolus and low NOx gas combustion ware of gas combustion ware

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JP2000143205A (en) * 1998-11-06 2000-05-23 Mitsubishi Heavy Ind Ltd Burner for hydrogen separation type reformer
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CN103162290A (en) * 2011-12-09 2013-06-19 株式会社能率 Rich-lean combustion burner and combustion apparatus
CN104633655A (en) * 2013-11-12 2015-05-20 韩国生产技术研究院 Ultra-low nitrogen oxide combustion apparatus using internal recirculation of combustion gas and method therefor
CN103900082A (en) * 2014-03-12 2014-07-02 宁波方太厨具有限公司 Bias burner
CN204786417U (en) * 2015-07-14 2015-11-18 北京市公用事业科学研究所 Urceolus and low NOx gas combustion ware of gas combustion ware

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Effective date of registration: 20190605

Address after: 100011 No. 35 Donghou Street, Ganshui Bridge Waiguan, Andingmen, Chaoyang District, Beijing

Co-patentee after: Yanshan Industry Gas Burning Device Co., Ltd., Beijing

Patentee after: Beijing Public Utility Research Institute

Co-patentee after: Beijing North fire ring energy technology development Co., Ltd.

Address before: 100011 No. 35 Donghou Street, Ganshui Bridge Waiguan, Andingmen, Chaoyang District, Beijing

Co-patentee before: Yanshan Industry Gas Burning Device Co., Ltd., Beijing

Patentee before: Beijing Public Utility Research Institute

Co-patentee before: Beijing Public Utility Technology Development Co., Ltd.