CN208952100U - The low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove - Google Patents

The low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove Download PDF

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Publication number
CN208952100U
CN208952100U CN201820739416.9U CN201820739416U CN208952100U CN 208952100 U CN208952100 U CN 208952100U CN 201820739416 U CN201820739416 U CN 201820739416U CN 208952100 U CN208952100 U CN 208952100U
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gas
axial
loopa
self
cylinder
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CN201820739416.9U
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张文达
张虔
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Zhejiang Ju Shuo Thermal Equipment Manufacturing Co Ltd
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Zhejiang Ju Shuo Thermal Equipment Manufacturing Co Ltd
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Abstract

The utility model relates to a kind of inner flue gas of the stove, and the low nitrogen gas burner of self-loopa is adjusted, including with axial air inlets, radial fuel gas inlet and the axial combustion barrel that exports, the fuel gas conduit being connected with radial fuel gas inlet is coaxially provided in combustion barrel, axial exit is equipped with igniter and steady flame plate.The combustion barrel includes offering multiple return ports along sequentially connected first, second cylinder of gas axial direction conveying direction, the second cylinder, and the smoke backflow amount adjustment structure for adjusting return port size is correspondingly provided in combustion barrel;Coaxial sleeve is equipped with guide disc on reflux hole site in fuel gas conduit, guide disc extends the hollow form rotary table peripheral wall that opening is gradually increased towards gas axial direction outbound course, it forms air-guiding aisle between the second cylinder, and air-guiding aisle is in tapered along gas axial direction conveying direction sectional dimension.This structure achievees the purpose that flue gas self-loopa, second-time burning by Negative Pressure Difference, realizes low-nitrogen discharged.

Description

The low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove
Technical field
The utility model relates to burner manufacturing technology fields more particularly to a kind of inner flue gas of the stove, and the low nitrogen of self-loopa is adjusted Gas burner.
Background technique
Air pollution caused by environmental problem, especially Industrial Boiler NOx emission, seriously affected the people life and Health.NOx emission causes acid rain to be formed, in air haze generation, the attention increasingly by government and the people.In work Industry field of boilers and station boiler field, country have put into effect stringent discharge standard and regulation.Existing burner NOx discharge generally is low nitrogen grade (80mg/m3 or less), and current technology can reach ultralow nitrogen grade (30mg/m3 or less) It is very few.Even if also unstable in day-to-day operation using FGR technology, main cause is that three gas proportion is difficult to control.
Common low-NO_x combustion technology mainly includes fractional combustion, premixed combustion technology, flue gas recirculation etc..Wherein, divide Grade combustion technology requires in-furnace temperature uniformly distributed, avoids the occurrence of localized hyperthermia, to reduce NOx generation, but how to realize good Air/gas classification is a difficult point.Premixed combustion technology is difficult to control two kinds of gas mixing effects, effect in practical applications It is bad, it is easy to appear the security risk that vibration is altered produced by detonation, less use.Flue gas recirculating technique extracts boiler smoke A part is sent into combustion furnace after mixing with fresh air and combustion gas mixing is burnt, and reduces the oxygen concentration in air, reduces in air Probability of the nitrogen in conjunction with oxygen, in practice using relatively broad.But traditional flue gas recirculation is needed by reflux blower Flue gas extraction is sent back into burner, that is, needs to lay circulating flue gas pipeline and control system again, space occupied is big, invests Height, and power loss 20-30%.
Utility model content
The technical problem to be solved by the utility model is to overcome the above problem, and it is adjustable to propose a kind of inner flue gas of the stove The low nitrogen gas burner of self-loopa is saved, flue gas automatic cycle channel is formed between boiler furnace and combustion barrel, in combustion process Middle realization smoke secondary decomposition combustion, is effectively reduced discharged nitrous oxides.
The technical solution of the utility model are as follows:
The low nitrogen gas burner of self-loopa, including combustion barrel is adjusted in a kind of inner flue gas of the stove described in the utility model, described Combustion barrel has axial air inlets, radial fuel gas inlet and axial outlet, is coaxially provided in combustion barrel and radial fuel gas inlet Connected fuel gas conduit, the axial direction exit are equipped with igniter and steady flame plate, it is characterised in that: the combustion barrel includes along gas Sequentially connected first cylinder of body axial direction conveying direction and the second cylinder offer in the circumferential wall of second cylinder in multiple The return port of outer perforation is also correspondingly provided with the smoke backflow amount adjustment structure for adjusting return port size in the combustion barrel; Coaxial sleeve is equipped with a guide disc on reflux hole site in the fuel gas conduit, and the guide disc is towards gas axial direction outbound course Extend the hollow form rotary table peripheral wall being gradually increased that is open, it is logical to form wind-guiding between rotary table peripheral wall and the second cylinder inboard wall Road, and the air-guiding aisle is tapered along gas axial direction conveying direction sectional dimension.
By above structure, the utility model is designed with aerodynamic principle by the hollow round table peripheral wall of guide disc, So that air-guiding aisle Stepwize Shrink, improves pressure, the flue gas to be formed is burnt by inside and outside differential pressure effect in combustion barrel axial direction exit It rolls up inspiration to self-contained and enters return port, so that entering air-guiding aisle together with combustion air carries out second-time burning.
Further, inner flue gas of the stove described in the utility model is adjusted in the low nitrogen gas burner of self-loopa, the cigarette Gas regurgitant volume adjustment structure include axially through block cylinder, the end ring circumferential rim for blocking cylinder is equipped with multiple axially extending Adjusting rod, be correspondingly provided with axially extending slippage slot on first cylinder, the adjusting rod matches therewith with slippage slot Sliding is connected and can be fixed by screw, blocks the other end of cylinder in shape is inwardly indented, thus blocking cylinder axially can slippingly hide Block return port.This structure can axially sliding pushes adjusting rod to realize to the progress of return port size according to Actual combustion flame conditions Variable adjustment, to optimize smoke backflow amount, it is ensured that second-time burning effect.And block cylinder and be inwardly indented, it is tapered in air-guiding aisle On the basis of make return port and block gap between cylinder in flaring shape, further speed up flow velocity, be conducive to itself and return port it Between negative pressure region formation, reflowing result is effectively ensured.
Further, inner flue gas of the stove described in the utility model is adjusted in the low nitrogen gas burner of self-loopa, and described time Discharge orifice is evenly distributed on the same reference circle of the second cylinder circumferential wall, and it is each to uniform reflux to guarantee that flue gas is able to.
Further, inner flue gas of the stove described in the utility model is adjusted in the low nitrogen gas burner of self-loopa, and described time Discharge orifice is in the semicircular strip in both ends.
Further, inner flue gas of the stove described in the utility model is adjusted in the low nitrogen gas burner of self-loopa, and described time Axial distance of the discharge orifice apart from igniter is 20-80mm, guarantees reflux apart from long enough, regurgitant volume is sufficiently large.
Further, inner flue gas of the stove described in the utility model is adjusted in the low nitrogen gas burner of self-loopa, the circle The bus of platform peripheral wall is 22-25o with respect to the tilt angle of guide disc central axis.
Further, inner flue gas of the stove described in the utility model is adjusted in the low nitrogen gas burner of self-loopa, the circle The axial length of platform peripheral wall is 60mm.Further, the low nitrogen combustion gas of self-loopa is adjusted in inner flue gas of the stove described in the utility model In burner, multiple air complementary apertures passed through for air are offered on the guide disc, it is sufficient for center flame position supplement Air, further promote its full combustion.
Further, inner flue gas of the stove described in the utility model is adjusted in the low nitrogen gas burner of self-loopa, the sky Gas complementary apertures are circle, and aperture 28-38mm, quantity is 6-12.
Further, inner flue gas of the stove described in the utility model is adjusted in the low nitrogen gas burner of self-loopa, the combustion Circumferentially wall uniformly extends the isocons of multiple horizontal L-types to annulus trachealis, and the combustion gas of radial inward is equipped on each isocon Thus inner outlet and combustion gas outer vent radially enable combustion gas radial diffusion spray, further expansion combustion range, drop Low flame concentrates generated NOx.
The beneficial effects of the utility model are:
1, the utility model forms inside and outside differential pressure by the rotary table peripheral wall of guide disc and the matching design of return port, reaches cigarette Gas automatic recirculating purpose, without in addition purchasing circulating flue gas equipment, laying circulation line, in the case where guaranteeing clean-burning effect It is effectively reduced equipment investment, no power waste and volume is simple and compact.
2, the utility model is realized by the way that high-temp combustion flue gas recirculation to be passed into combustion air to inabundant in flue gas The fuel gas of burning carries out second-time burning, improves combustion gas utilization rate, while fume afterheat being made full use of to significantly improve combustion-supporting sky Temperature degree reduces the oxygen concentration of flame high-temperature region, combustion zone temperature peak value is effectively reduced, temperature is uniform, significantly inhibits heating power The production quantity of type NOx has flameholding, complete combustibility high.The secondary flue gas combustion that the utility model carries out in burner hearth It burns, power of motor is consumed without FGR outer circulation, to reach energy saving purpose.
3, the utility model design smoke backflow amount adjustment structure realizes the variable adjustment to return port, to change flue gas Regurgitant volume ensures to reach optimal combustion state under different operating conditions as far as possible, and suitability is wider.Regulative mode simple and flexible, It only needs that adjusting rod is pushed axially to slide, is just able to achieve.
4, this structure adds guide disc air complementary apertures, can supplement large quantity of air in fuel gas buring for center region, make It is more complete to obtain fuel gas buring, ensure that flame combustion is more stable, improves efficiency of combustion, realizes low nitrogen burning.And the processing is simple, no Overall structure can be made to complicate because of the setting of air complementary apertures.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Fig. 2 is the schematic cross-sectional view of the utility model.
Fig. 3 is the structural schematic diagram described in the utility model for blocking cylinder.
Specific embodiment
The utility model is further described now in conjunction with attached drawing:
Referring to Figures 1 and 2, a kind of adjustable low nitrogen gas burner of self-loopa of inner flue gas of the stove, packet described in the present embodiment Combustion barrel 1 is included, the combustion barrel 1 has axial air inlets, radial fuel gas inlet and axial outlet, coaxially sets in combustion barrel 1 There is the fuel gas conduit 2 being connected with radial fuel gas inlet, the axial direction exit is equipped with igniter (not shown) and steady flame plate 3.The fuel gas conduit 2 uniformly extends the isocon 13 of multiple horizontal L-types around circumferential wall, is equipped with diameter on each isocon 13 To combustion gas inner outlet inwardly and combustion gas outer vent radially.Combustion gas axially conveys in fuel gas conduit 2, in middle section region quilt It radially outward leads out into each isocon 13 and is evenly dispersed into multiply fuel gas flow, continue thereafter along axial defeated Send, and by combustion gas inner outlet, combustion gas outer vent inwardly, to external diffusion, biggish dissipation region is formed, to expand combustion zone Domain achievees the purpose that temperature distribution equalizing, reduces the discharge of NOx.
The combustion barrel 1 includes along sequentially connected first cylinder 4 of gas axial direction conveying direction and the second cylinder 5, the two Between can be detachably connected by screw.Multiple inside and outside return ports 6 penetrated through, institute are offered in the circumferential wall of second cylinder 5 Return port 6 is stated to be evenly distributed on the same reference circle of 5 circumferential wall of the second cylinder.Specifically, the return port 6 is in both ends half Circular strip, the axial distance apart from igniter are 20-80mm, to provide sufficiently long reflux distance, further Guarantee regurgitant volume.
The smoke backflow amount adjustment structure for adjusting 6 size of return port is also correspondingly provided in the combustion barrel 1.Specifically Ground, as shown in connection with fig. 3, the smoke backflow amount adjustment structure include axially through block cylinder 9, described one end for blocking cylinder 9 Ring circumferential rim is equipped with multiple axially extending adjusting rods 10, is correspondingly provided with axially extending slippage slot 11 on first cylinder 4, The adjusting rod 10 matched with slippage slot 11 therewith sliding connect and can be fixed by screw, block cylinder 9 the other end be in Interior retraction shape, thus blocking cylinder 9 axially can slippingly shelter from return port 6.
Coaxial sleeve is equipped with a guide disc 7 on 6 position of return port in the fuel gas conduit 2, and the guide disc 7 is towards gas Axial outbound course extends the hollow form rotary table peripheral wall 8 being gradually increased that is open, 5 inner wall of rotary table peripheral wall 8 and the second cylinder Between form air-guiding aisle, and the air-guiding aisle is tapered along gas axial direction conveying direction sectional dimension.Guide disc 7 and the second cylinder 5 coaxial arrangements, it is ensured that each upward pressure is consistent, and flue gas enters along each to equalization stable.It should be noted that the present embodiment institute It is 22-25o that the bus of rotary table peripheral wall 8, which is stated, with respect to the tilt angle of 7 central axis of guide disc, axial length 60mm, above-mentioned to incline Rake angle and axial distance are the optimal values range obtained after overtesting, and it is sufficiently large that smoke backflow amount is effectively ensured.It is described Multiple air complementary apertures 12 passed through for air are also provided on guide disc 7.The air complementary apertures 12 are circle, according to power Its aperture is set as 28-38mm, quantity is 6-12.
After the burner hearth of burner and boiler, which is installed, to be connected, combustion gas forms the fuel gas flow of direct current in fuel gas conduit 2, and leads to The isocon 13 for crossing annular laying, which is radially outward spread, is ejected into axial exit;Air shape between combustion barrel 1 and fuel gas conduit 2 Sprayed forward at the air draught of direct current, and by the tapered air-guiding aisle in section pressure increased, air-flow return port 6 with It blocks the adjacent one end region that cylinder 9 is inwardly indented and forms negative pressuren zone, thus under inside and outside differential pressure effect, the combustion of front side axial direction exit It burns the high-temperature flue gas formed and is reversed volume and inhale, through in return port 6 automatic cycle to combustion barrel 1, and mix with air, continue edge and lead Wind channel is transported to combustion zone and carries out second-time burning.Simultaneously, air is also axial from the air complementary apertures 12 on guide disc 7 It is ejected into axial exit, is air needed for the preferably aftercombustion of combustion centre region, optimizes air-fuel ratio, promote burning more Add sufficiently, improve efficiency of combustion, combustion fan power is not lost, reaches energy saving purpose.
This structure is based on recycling in combustion gas furnace, reaches abundant by being mixed into suitable high-temperature flue gas in combustion air The purpose of low nitrogen burning, the mechanism of action are broadly divided into the following aspects.
It the first, is remaining not sufficiently combusted combustion gas and fuel gas (CO, NOx) in the flue gas for generating combustion process It is re-fed into combustion zone and carries out second-time burning, realize and fuel gas is made full use of, saved the energy, reduce the life of equipment Cost is produced, the practicability of equipment is improved.
The second, air is preheated by the heat of high-temperature flue gas, so that subsequent combustion reaction is more abundant, sufficiently Heat utilization ratio is played, heat is further utilized, and the loss of heat is reduced, more energy-saving.
Third, flue gas, which pour in combustion air, can water down dilution nitrogen therein, oxygen concentration, and the temperature of flame region is effectively reduced Peak value is spent, the formation of thermal NO x is controlled, achievees the purpose that low nitrogen burning.This structure is compared to traditional structure, without in addition purchase It sets circulating flue gas equipment, lay circulation line, equipment cost is also effectively reduced in the case where guaranteeing clean-burning effect.
It is used by combustion testing, the present embodiment burns under the conditions of 1480kW, and flame blue is uniformly distributed, and combustion state is containing Sufficiently stable under oxygen amount 2.1%, the operating condition of load 30-100%, discharging CO in flue gas is to reach low nitrogen to 0ppm, NOx 13ppm Standard.
Specific embodiment described herein is only illustrative of the principle and efficacy of the utility model, not for Limit the utility model.Any person skilled in the art all can be under the spirit and scope without prejudice to the utility model, to upper It states embodiment and carries out modifications and changes.Therefore, as long as those of ordinary skill in the art is practical new without departing from this All equivalent modifications or change completed under the revealed spirit of type and technical idea, should be wanted by the right of the utility model It asks and is covered.

Claims (10)

1. the low nitrogen gas burner of self-loopa, including combustion barrel is adjusted in a kind of inner flue gas of the stove, the combustion barrel has axial empty Gas import, radial fuel gas inlet and axial direction export, and the fuel gas conduit being connected with radial fuel gas inlet is coaxially provided in combustion barrel, described Axial exit be equipped with igniter and steady flame plate, it is characterised in that: the combustion barrel include along gas axial direction conveying direction according to The first cylinder and the second cylinder of secondary connection offer multiple inside and outside return ports penetrated through in the circumferential wall of second cylinder, The smoke backflow amount adjustment structure for adjusting return port size is also correspondingly provided in the combustion barrel;It is close in the fuel gas conduit Flow back hole site on coaxial sleeve be equipped with a guide disc, the guide disc towards gas axial direction outbound course extend one opening by Cumulative big hollow form rotary table peripheral wall, forms air-guiding aisle, and the air-guiding aisle edge between rotary table peripheral wall and the second cylinder inboard wall Gas axial direction conveying direction sectional dimension is tapered.
2. the low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove according to claim 1, it is characterised in that: the cigarette Gas regurgitant volume adjustment structure include axially through block cylinder, the end ring circumferential rim for blocking cylinder is equipped with multiple axially extending Adjusting rod, be correspondingly provided with axially extending slippage slot on first cylinder, the adjusting rod matches therewith with slippage slot Sliding is connected and can be fixed by screw, blocks the other end of cylinder in shape is inwardly indented, thus blocking cylinder axially can slippingly hide Block go back to hole.
3. the low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove according to claim 1, it is characterised in that: described time Discharge orifice is evenly distributed on the same reference circle of the second cylinder circumferential wall.
4. the low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove according to claim 1, it is characterised in that: described time Discharge orifice is in the semicircular strip in both ends.
5. the low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove according to claim 1 or 2 or 3 or 4, feature exists In: axial distance of the return port apart from igniter is 20-80mm.
6. the low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove according to claim 1, it is characterised in that: the circle The bus of platform peripheral wall is 22-25o with respect to the tilt angle of guide disc central axis.
7. the low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove according to claim 1 or 6, it is characterised in that: institute The axial length for stating rotary table peripheral wall is 60mm.
8. the low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove according to claim 1, it is characterised in that: described to lead Multiple air complementary apertures passed through for air are offered on wind disk.
9. the low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove according to claim 8, it is characterised in that: the sky Gas complementary apertures are circle, and aperture 28-38mm, quantity is 6-12.
10. the low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove according to claim 1, it is characterised in that: described Fuel gas conduit uniformly extends the isocon of multiple horizontal L-types around circumferential wall, and the combustion of radial inward is equipped on each isocon Gas inner outlet and combustion gas outer vent radially.
CN201820739416.9U 2018-05-18 2018-05-18 The low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove Active CN208952100U (en)

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CN201820739416.9U CN208952100U (en) 2018-05-18 2018-05-18 The low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove

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CN201820739416.9U CN208952100U (en) 2018-05-18 2018-05-18 The low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110285417A (en) * 2019-06-28 2019-09-27 江苏卡瓦诺热能科技有限公司 Super low NO

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110285417A (en) * 2019-06-28 2019-09-27 江苏卡瓦诺热能科技有限公司 Super low NO
CN110285417B (en) * 2019-06-28 2020-07-10 江苏卡瓦诺热能科技有限公司 Ultra-low nitrogen burner

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