CN107062226A - A kind of big backflow low NO of high-temperature flue gas - Google Patents

A kind of big backflow low NO of high-temperature flue gas Download PDF

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Publication number
CN107062226A
CN107062226A CN201710369010.6A CN201710369010A CN107062226A CN 107062226 A CN107062226 A CN 107062226A CN 201710369010 A CN201710369010 A CN 201710369010A CN 107062226 A CN107062226 A CN 107062226A
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CN
China
Prior art keywords
flue gas
fuel nozzle
flow channel
temperature flue
air flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710369010.6A
Other languages
Chinese (zh)
Inventor
刘荣
张立申
李仲博
赵军
贾萌
赫铮
周五林
张翊华
万云琴
王海鸿
周宇涵
张玥
林钧
张瑞娟
孟震
赵青
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BEIJING DISTRICT HEATING GROUP Co Ltd
Original Assignee
BEIJING DISTRICT HEATING GROUP Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BEIJING DISTRICT HEATING GROUP Co Ltd filed Critical BEIJING DISTRICT HEATING GROUP Co Ltd
Priority to CN201710369010.6A priority Critical patent/CN107062226A/en
Publication of CN107062226A publication Critical patent/CN107062226A/en
Pending legal-status Critical Current

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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
    • F23D14/20Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F23D14/22Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
    • F23D14/24Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other at least one of the fluids being submitted to a swirling motion
    • 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
    • F23D14/70Baffles or like flow-disturbing devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D2900/00Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14Special features of gas burners

Abstract

A kind of big backflow low NO of high-temperature flue gas, it can be applicable to civilian and industrial furnace field, including burner shell, central cylinder is provided with the burner casing body, third level fuel nozzle ports, several fins radially distributed, second level fuel nozzle ports are distributed in the middle of several described fins, there are swirl vane and central cylinder air inlet in the rear portion of the central cylinder, there is inner sleeve the central cylinder front end, inner ring air flow channel is formed between the inner sleeve and the central cylinder, annular air cleft air flow channel is formed between outer sleeve and the inner sleeve, the front end of the annular air cleft air flow channel is provided with porous disc, the rear end of the annular air cleft air flow channel is the annular air cleft formed between the outer sleeve and the inner sleeve, outer shroud air flow channel is formed between the outer sleeve and the burner shell, there is first order fuel nozzle in the outer shroud air flow channel, first order fuel nozzle ports are towards the inwall of the burner shell.

Description

A kind of big backflow low NO of high-temperature flue gas
Technical field
The present invention relates to industrial gasses burner technology, such as low NO, more particularly to a kind of high-temperature flue gas Big backflow low NO, the big backflow of high-temperature flue gas refers to that the combustion product gases i.e. high-temperature flue gas in burner hearth can circulate inflow The recirculating zone in the stove that burner nozzle is formed, the low nitrogen is to refer to reduction nitrogen oxides i.e. NOX generation and discharge.
Background technology
With Chinese society and economic fast development, energy resource consumption also quickly increases, and DS NOx Est amount is also constantly increasing Long, environmental problem is increasingly serious, it has also become threaten one of principal element of human kind sustainable development.In recent years, country is to discharge The requirement of index is more and more stricter, thus further control nitrogen oxides (NOX) discharge to national economy and environmental protection can Sustainable development is most important.NOX generation is divided into three classes, respectively thermal NO X, Quick-type NOX, fuel type NOX.Natural gas In nitrogen content it is relatively low, therefore NOx main sources be thermal NO x and Quick-type NOx.When thermal NO X is burning in air N2 and O2 generate at high temperature, when concentration when its major influence factors has reaction temperature, N2 and an O2 reactions and stop Between, wherein the most key influence factor is reaction temperature.Quick-type NOx is that hydrocarbon group occurs in N2 and fuel in air What series reaction was produced.
Low-NO_x combustion technology main at present has:The burning of low excess air coefficient, Researched of Air Staging Combustion Burning Pulverized Coal, fuel staging combustion Burning, flue gas recirculation, flameless combustion, premixed combustion etc..Natural gas low-NO_x combustion technology mainly around reduction ignition temperature so that Reduce thermal NO X generation development.The reduction of ignition temperature can by control combustion zone excess air coefficient come Regulation, basic ideas are all burning is occurred under conditions of equivalent proportion is deviateed for 1, make burning in lean combustion or fuel-rich situation It is lower to carry out, so as to avoid the occurrence of area of localized hyperthermia, reduce thermal NO X generation.The reduction of ignition temperature can also pass through cigarette Gas is recycled for realization, and flue gas recirculation includes flue gas interior circulation and flue gas outer circulation.Flue gas interior circulation be by burner with The special structure design of burner hearth, makes flue gas produce backflow inside burner hearth;Flue gas outer circulation is from a certain position of boiler by flue gas It is re-introduced into by external pipe in burner hearth, participates in combustion reaction.The purpose for adding flue gas recirculation is for flue gas Combustion product be added in combustion zone, reduce ignition temperature, while add flue gas can reduce combustion zone oxygen point Pressure, so that weaken the thermal NO X processes that oxygen is generated with nitrogen, final reduction NOX discharge.
The inventors discovered that, current several low NO technologies all differ from one another, but each some problems.Example Such as, the combustible loss that the burning of low excess air coefficient is caused is big, and boiler thermal output is low;Premixed combustion technology combustion instability, can It can cause to be tempered or stop working;Flue gas recirculation can make decrease in oxygen partial pressure, and air velocity increase makes combustion instability, put out The phenomenons such as fire, vibration.
The content of the invention
The present invention is for defect present in prior art or not enough there is provided a kind of big backflow low nitrogen burning of high-temperature flue gas Device, the big backflow of high-temperature flue gas refers to that the combustion product gases i.e. high-temperature flue gas in burner hearth can circulate inflow by burner nozzle shape Into stove in recirculating zone, the low nitrogen is to refer to reduction nitrogen oxides i.e. NOX generation and discharge.The present invention, which has, has burnt Entirely, combustion stability is good, and the thermal efficiency is high, and the characteristics of discharge is few can be applicable to civilian and industrial furnace field.
Technical scheme is as follows:
A kind of big backflow low NO of high-temperature flue gas, it is characterised in that including burner shell, the burner shell Rear end there is the connecting interface of connection air intake section, be provided with central cylinder, centered cylinder in the burner casing body The centre of body front end is provided with third level fuel nozzle ports, and several that radially distribute are provided with along the centre Fin, second level fuel nozzle ports are distributed in the middle of several described fins, by preceding on the rear portion outer peripheral face of the central cylinder It is disposed with backward on swirl vane and central cylinder air inlet, the outer peripheral face of the central cylinder front end in being provided with Sleeve, is formed between the inner sleeve and the central cylinder outside being provided with the outside of inner ring air flow channel, the inner sleeve Sleeve, is formed between the outer sleeve and the inner sleeve before annular air cleft air flow channel, the annular air cleft air flow channel End is provided with porous disc, and the rear end of the annular air cleft air flow channel is the ring formed between the outer sleeve and the inner sleeve Shape air cleft, forms in outer shroud air flow channel, the outer shroud air flow channel between the outer sleeve and the burner shell and sets There is a first order fuel nozzle, the first order fuel nozzle ports of the first order fuel nozzle are towards in the burner shell Wall.
The first order fuel nozzle ports are located on the front end outer peripheral face of the first order fuel nozzle.
Housing forward end inwall blade is provided with the burner casing body.
The outer sleeve is tubaeform with the inner sleeve;Or, the outer sleeve to be tubaeform, the inner sleeve Inwall is straight barrel type and outer wall is taper;The slit width of the annular air cleft passes through the axle between the outer sleeve and the inner sleeve Adjusted to displacement, when the outer sleeve is moved along, the slit width narrows.
The number of several fins is 10~20.
The number of the swirl vane is 10~30, and swirl vane setting angle is 10~30 °.
The number of the first order fuel nozzle is 5~10.
The number of the second level fuel nozzle ports is 4~8.
The number of the third level fuel nozzle ports is 6~12.
The percent opening of the porous disc is 1~5%.
The setting angle of the housing forward end inwall blade is 10~30 °.
The fuel quantity that the first order fuel nozzle ports spray accounts for the 80~90% of total fuel quantity.
The fuel quantity that the second level fuel nozzle ports spray accounts for the 5~10% of total fuel quantity.
The fuel quantity that the third level fuel nozzle ports spray accounts for the 1~5% of total fuel quantity.
The technology of the present invention effect is as follows:The present invention is the low high-temperature flue gas of a kind of thermal efficiency height, flameholding, DS NOx Est Big backflow low NO, can be while NOX generations be effectively reduced, surely using the big backflow of high-temperature flue gas and flue gas recirculation Fixed to burn and burn completely, complete with burning, stability is good, efficiency high, the characteristics of discharging less, can be applicable to civilian and work Industry stove field.
Compared with prior art, the big backflow low NO of high-temperature flue gas of the present invention is by three-level fuel and by adjusting Section outer sleeve controls burner nozzle flow velocity in the position of axial direction, so that recirculating zone and high temperature gases recirculating amount in stove are controlled, The purpose that combustion flame is layered is reached by air classification ratio simultaneously, the superposition of flame is effectively reduced, reduces flame temperature Degree, so as to reach the purpose of control DS NOx Est.
The big backflow low NO of high-temperature flue gas of the present invention can be in freeze profile into special backflow vortex structure:From interior annular space The air-flow of flow channel outflow is formed about two small backflows in the center close to burner nozzle to whirlpool, and this backflow whirlpool is not only Play a part of stable burning, and smoke backflow reduces the temperature of recirculating zone to this recirculating zone interior energy, so as to reduce NOX lifes Into;The air-flow flowed out from outer shroud air flow channel in freeze profile into big recirculating zone, the smoke backflow produced in burner hearth to this area The formation in domain, effectively reduction thermal NO X.The present invention can coordinate with flue gas recirculating technique, in higher flue gas recirculation It can stablize under rate and burn, and burning is complete, so that NOX generations are reduced into 30mg/Nm3, (Nm3 refers at 0 degree Celsius 1 The gas volume of normal atmosphere pressure;N represents standard conditions Nominal Condition, i.e. the condition of air is:One standard Atmospheric pressure, temperature is 0 DEG C, and relative humidity is 0%) below, to reach the level of minimum discharge.
Brief description of the drawings
Fig. 1 is the structural representation for implementing a kind of big backflow low NO of high-temperature flue gas of the invention.
Fig. 2 is the central unit construction schematic diagram in Fig. 1.
Reference lists as follows:1- air intakes section;2- burner shells;3- central cylinders front end;4- fins;5- First order fuel nozzle;6- porous discs;7- housing forward end inwall blades;8- inner sleeves;9- outer sleeves;10- third level fuel sprays Mouthful;11- second level fuel nozzle ports;12- swirl vanes, 13- central cylinders;14- outer shroud air flow channels;15- inner ring air streams Road;16- annular air clefts;17- annular air cleft air flow channels;50- first order fuel nozzle ports;130- central cylinder air inlets.
Embodiment
Below in conjunction with the accompanying drawings (Fig. 1-Fig. 2) the present invention will be described.
Fig. 1 is the structural representation for implementing a kind of big backflow low NO of high-temperature flue gas of the invention.During Fig. 2 is Fig. 1 Central unit construction schematic diagram.As shown in Figure 1 to Figure 2, a kind of big backflow low NO of high-temperature flue gas, including burner shell 2, the rear end of the burner shell 2, which has in the connecting interface of connection air intake section 1, the burner shell 2, to be provided with Central cylinder 13, the centre of central cylinder front end 3 is provided with third level fuel nozzle ports 10, is set along the centre Several fins 4 radially distributed are equipped with, second level fuel nozzle ports 11 are distributed in the middle of several described fins 4, described Swirl vane 12 and central cylinder air inlet 130 are disposed with from the front to the back on the rear portion outer peripheral face of central cylinder 13, Inner sleeve 8 is provided with the front end outer peripheral face of the central cylinder 13, between the inner sleeve 8 and the central cylinder 13 Form inner ring air flow channel 15, the outside of the inner sleeve 8 is provided with outer sleeve 9, the outer sleeve 9 and the inner sleeve 8 it Between form annular air cleft air flow channel 17, the front end of the annular air cleft air flow channel 17 is provided with porous disc 6, the annular gas The rear end of seam air flow channel 17 is the annular air cleft 16 formed between the outer sleeve 9 and the inner sleeve 8, the outer sleeve 9 Formed between the burner shell 2 in outer shroud air flow channel 14, the outer shroud air flow channel 14 and be provided with first order fuel Jet pipe 5, the first order fuel nozzle ports 50 of the first order fuel nozzle 5 are towards the inwall of the burner shell 2.
The first order fuel nozzle ports 50 are located on the front end outer peripheral face of the first order fuel nozzle 5.The burner Housing forward end inwall blade 7 (also known as small air blade) is provided with housing 2.The outer sleeve 9 and the inner sleeve 8 are loudspeaker Shape;Or, the outer sleeve is tubaeform, and the inwall of the inner sleeve is straight barrel type and outer wall is taper;The annular air cleft 16 slit width is adjusted by the axial displacement between the outer sleeve 9 and the inner sleeve 8, when the outer sleeve 9 is moved along When, the slit width narrows.The number of several fins 4 is 10~20.The number of the swirl vane 12 is 10~30 Individual, the setting angle of swirl vane 12 is 10~30 °.The number of the first order fuel nozzle 5 is 5~10.The second level The number of fuel nozzle ports 11 is 4~8.The number of the third level fuel nozzle ports 10 is 6~12.The porous disc 6 is opened Porosity is 1~5%.The setting angle of the housing forward end inwall blade 7 is 10~30 °.The first order fuel nozzle ports 50 are sprayed The fuel quantity gone out accounts for the 80~90% of total fuel quantity.The fuel quantity that the second level fuel nozzle ports 11 spray accounts for the 5 of total fuel quantity ~10%.The fuel quantity that the third level fuel nozzle ports 10 spray accounts for the 1~5% of total fuel quantity.
Refering to Fig. 1-Fig. 2, combustion air (also known as fires from air intake section 1 into burner shell 2 in the present embodiment Burner sleeve) in, have sub-fraction air-flow by central cylinder air inlet 130 be split enter central cylinder 13 in after from The side of fin 4 outflow of central cylinder front end 3, most of airflow passes swirl vane 12, and eddy flow circumferential passages.In rotation Flow in the presence of blade, air stream carries certain curl.Air stream is divided into three strands of air-flows, three strands of air-flows in burner front end Flow separately through inner ring air flow channel 15, annular air cleft 16 (also known as annular enters air cleft) and outer shroud air flow channel 14.Outer shroud air Big return-flow structure is formed in burner hearth middle and lower part, the formation of the environment of flue gas interior circulation, effectively reduction thermal NO X is formed.It is interior Annular space gas forms the small plot structure that flowed back to whirlpool, when being carried out when burning, the flue gas meeting that flame front is produced before burner nozzle It is back in this recirculating zone, the flue gas recirculation inside formation, not only acts as the purpose of stable burning, and also reduces NOx Generation.The uninterrupted of three strands of described air-flows can be controlled by adjusting outer sleeve 9 in the position of axial direction.
Refering to Fig. 1, the side of fin 4 can form the weak eddy flow in center as air outlet, the air-flow of outflow, and this weak eddy flow is not Only there is facilitation to fuel blending, and have certain effect to stablizing burning.The number of fin 4 10-20, the length of fin 4 About the 1/3 of the diameter of central cylinder front end 3.Number, length and the width of the fin 4 can enter according to natural fuel situation Row adjustment.Refering to Fig. 2, the major function of the swirl vane 12 is to provide certain gas cyclone number, spinning disk number 10 ~30.In the present embodiment, the number of swirl vane 12 is 16,30 ° of setting angle.The big I of the eddy flow of swirl vane 12 With by the number for adjusting swirl vane 12, swirl vane 1) setting angle optimize.Refering to Fig. 1, the porous disc 6 it is big The small influence to overall flow field is very big, and the size of porous disc 6 influences the flow velocity of combustion-supporting air flow, so as to influence combustion stability And combustion flame form.In the present embodiment, the size of porous disc 6 is adjusted to reach inner and outer rings air velocity 60m/s or so size range.
Fuel quantity point three-level ratio is allocated in the present embodiment, and wherein primary fuel jet pipe is located at burner cylinder Periphery, primary fuel spout 50 is opened in the side wall of primary fuel jet pipe 5, and fuel strikes burning after the ejection of primary fuel spout 50 Body cylinder wall, as outer shroud air stream flows to burner hearth after having preliminary mix with outer shroud air stream.Secondary fuel spout 11 is opened In the outer circumferential side region of central cylinder front end 3.Three-level fuel nozzle ports 10 are opened in the inner ring circumferential area in central cylinder front end 3. Fuel with the side outlet of fin 4 flow after tentatively premixing after secondary fuel spout 11 and three-level fuel nozzle ports 10 spray Enter burner hearth to be burnt.Number, fuel injection speed, the fuel nozzle ports shape of fuel nozzle can be adopted to control fuel and air Incorporation time.The number of primary fuel jet pipe 5 is 5~10.In the present embodiment, jet pipe number is 5, nozzle configuration To be square.The number of secondary fuel spout 11 4~8, in the present embodiment, spout number are 4, and nozzle configuration is circle Shape.The number of three-level fuel nozzle ports 10 is 6~12, in the present embodiment, and spout number is 8, and nozzle configuration is circle.
It is hereby stated that, it is described above to contribute to skilled artisan understands that the invention, but not limit the present invention The protection domain of creation.It is any that equivalent substitution described above, modification are improved without departing from the invention substantive content And/or the implementation deleted numerous conform to the principle of simplicity and carried out, each fall within the protection domain of the invention.

Claims (10)

1. a kind of big backflow low NO of high-temperature flue gas, it is characterised in that including burner shell, the burner shell Rear end, which has in the connecting interface of connection air intake section, the burner casing body, is provided with central cylinder, central cylinder The centre of front end is provided with third level fuel nozzle ports, and several ribs radially distributed are provided with along the centre Piece, second level fuel nozzle ports are distributed in the middle of several described fins, by forward direction on the rear portion outer peripheral face of the central cylinder After be disposed with swirl vane and central cylinder air inlet, the outer peripheral face of the central cylinder front end and be provided with inner sleeve Cylinder, forms on the outside of inner ring air flow channel, the inner sleeve between the inner sleeve and the central cylinder and is provided with overcoat Cylinder, forms annular air cleft air flow channel, the front end of the annular air cleft air flow channel between the outer sleeve and the inner sleeve Porous disc is provided with, the rear end of the annular air cleft air flow channel is the annular formed between the outer sleeve and the inner sleeve Air cleft, forms between the outer sleeve and the burner shell and is provided with outer shroud air flow channel, the outer shroud air flow channel First order fuel nozzle, the first order fuel nozzle ports of the first order fuel nozzle are towards the inwall of the burner shell.
2. a kind of big backflow low NO of high-temperature flue gas according to claim 1, it is characterised in that the first order combustion Expect that spout is located on the front end outer peripheral face of the first order fuel nozzle.
3. a kind of big backflow low NO of high-temperature flue gas according to claim 1, it is characterised in that the burner casing It is provided with housing forward end inwall blade in vivo.
4. the big backflow low NO of a kind of high-temperature flue gas according to claim 1, it is characterised in that the outer sleeve with The inner sleeve is tubaeform;Or, the outer sleeve is tubaeform, and the inwall of the inner sleeve is straight barrel type and outer wall is Taper;The slit width of the annular air cleft is adjusted by the axial displacement between the outer sleeve and the inner sleeve, when described outer When sleeve is moved along, the slit width narrows.
5. a kind of big backflow low NO of high-temperature flue gas according to claim 1, it is characterised in that several described ribs The number of piece is 10~20.
6. a kind of big backflow low NO of high-temperature flue gas according to claim 1, it is characterised in that the swirl vane Number be 10~30, swirl vane setting angle be 10~30 °.
7. a kind of big backflow low NO of high-temperature flue gas according to claim 1, it is characterised in that the first order combustion The number for expecting jet pipe is 5~10, and the number of the second level fuel nozzle ports is 4~8, of the third level fuel nozzle ports Number is 6~12.
8. the big backflow low NO of a kind of high-temperature flue gas according to claim 1, it is characterised in that the porous disc Percent opening is 1~5%.
9. a kind of big backflow low NO of high-temperature flue gas according to claim 3, it is characterised in that the housing forward end The setting angle of inwall blade is 10~30 °.
10. a kind of big backflow low NO of high-temperature flue gas according to claim 1, it is characterised in that the first order The fuel quantity that fuel nozzle ports spray accounts for the 80~90% of total fuel quantity, and the fuel quantity that the second level fuel nozzle ports spray accounts for total combustion The 5~10% of doses, the fuel quantity that the third level fuel nozzle ports spray accounts for the 1~5% of total fuel quantity.
CN201710369010.6A 2017-05-23 2017-05-23 A kind of big backflow low NO of high-temperature flue gas Pending CN107062226A (en)

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CN201710369010.6A CN107062226A (en) 2017-05-23 2017-05-23 A kind of big backflow low NO of high-temperature flue gas

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Application Number Priority Date Filing Date Title
CN201710369010.6A CN107062226A (en) 2017-05-23 2017-05-23 A kind of big backflow low NO of high-temperature flue gas

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020259577A1 (en) * 2019-06-28 2020-12-30 浙江先创能源科技股份有限公司 Combustor with low nitrogen oxide emission
WO2021051635A1 (en) * 2019-09-18 2021-03-25 安德森热能科技(苏州)有限责任公司 Low-nitrogen air heating turbulent burner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020259577A1 (en) * 2019-06-28 2020-12-30 浙江先创能源科技股份有限公司 Combustor with low nitrogen oxide emission
WO2021051635A1 (en) * 2019-09-18 2021-03-25 安德森热能科技(苏州)有限责任公司 Low-nitrogen air heating turbulent burner

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