CN107606613A - The low nitrogen rotational flow gas-fired combustor of flue gas recirculation built in gas-air Accurate Classification - Google Patents
The low nitrogen rotational flow gas-fired combustor of flue gas recirculation built in gas-air Accurate Classification Download PDFInfo
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- CN107606613A CN107606613A CN201710892758.4A CN201710892758A CN107606613A CN 107606613 A CN107606613 A CN 107606613A CN 201710892758 A CN201710892758 A CN 201710892758A CN 107606613 A CN107606613 A CN 107606613A
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Abstract
The present invention relates to a kind of low nitrogen rotational flow gas-fired combustor of flue gas recirculation built in gas-air Accurate Classification, including burner hearth, furnace wall and the center fuel conveyance conduit being arranged successively from inside to outside, First air passage and hybrid channel, the front end of center fuel conveyance conduit, First air passage and hybrid channel both passes through furnace wall and stretched into burner hearth；Some sections of recirculation lines are provided with the lateral wall of hybrid channel, recirculation line is located in burner hearth；Center fuel conveyance conduit front end sets center fuel shower nozzle and several secondary fuel shower nozzles；It is spaced in hybrid channel and is evenly arranged several three-level fuel guns and secondary-wind spray gun, center fuel conveyance conduit and three-level fuel gun is all connected with fuel supply system；First air passage and secondary-wind spray gun are all connected with aoxidizing agent feeding device.The present invention can be effectively improved combustion position, high combustion efficiency, significantly reduce the concentration of nitrogen oxides.
Description
Technical field
The invention belongs to gas burner field, flue gas recirculation built in more particularly to a kind of gas-air Accurate Classification
Low nitrogen rotational flow gas-fired combustor.
Background technology
Nitrogen oxides is to cause one of primary pollution source of atmosphere pollution, and it is except forming acid rain, moreover it is possible to forms photochemistry
Smog, endanger human health.But chemical reaction during due to burning can not be avoided using the burner of existing fossil fuel
And caused there is NO and NO2Chemical formula nitrogen oxides (NOX).In industry by improve fuel and air mixed style,
The structure of the burners such as air fuel ratio develops the low NO for suppressing nitrogen oxidesXCombustion technology.
The low NO used at presentXBurner mainly has two kinds.One kind is Researched of Air Staging Combustion Burning Pulverized Coal device.Researched of Air Staging Combustion Burning Pulverized Coal device makes
Combustion air splits into First air and Secondary Air, combustion gas is first burnt in the first combustion zone of oxygen deprivation, reduces NOXFormation, then
In the second combustion zone after-flame in the presence of Secondary Air.Another low NOXBurner is combustion gas gradual combustor, combustion air one
It is secondary to be fully incorporated the first combustion zone, but only have part of fuel to be burned in the first combustion zone, remaining fuel is introduced separately
To the second combustion zone, burnt using the superfluous oxygen in the first combustion zone.In this burner, the superfluous sky in the first combustion zone
Gas dilutes fuel, and ignition temperature is relatively low, reduces NOXFormation.
Flue gas recirculation (FGR) is another low NOXCombustion method.Flue gas recirculation (FGR) is exactly to make a part of burning
The flue gas recirculation of completion returns to bellows, and after being mixed with fresh fuel, combustion zone is turned again to fuel.To gas burner
Speech, flue gas recirculation (FGR) is most effective and the better simply reduction NO of structureXSystem, and can be with other low NOXMethod knot
Close and use.But external flue gas recirculation is complicated, it is necessary to which extra equipment, economy are not so good as built-in flue gas recirculation.
With going deep into for national energy-saving emission reduction policy, some cities have required NOXDischarge is less than 30mg/m3.Only pass through one
Kind of low-NO_x combustion technology is difficult to reach above-mentioned requirements, therefore, adopts the technical scheme that air classification, fuel staging and built-in
The technologies such as flue gas recirculation combine.
The content of the invention
It is an object of the invention to overcome problems of the prior art, there is provided built in a kind of gas-air Accurate Classification
The low nitrogen rotational flow gas-fired combustor of flue gas recirculation, efficiency of combustion can be improved to gas-air Accurate Classification, reduce nitrogen oxidation
Thing content.
In order to achieve the above object, the present invention adopts the following technical scheme that：
Including burner hearth, furnace wall and the center fuel conveyance conduit being arranged successively from inside to outside, First air passage and mixing
Passage, the front end of center fuel conveyance conduit, First air passage and hybrid channel both pass through furnace wall and stretched into burner hearth；Hybrid channel
Lateral wall on be provided with some sections of recirculation lines, recirculation line is located in burner hearth；
Center fuel conveyance conduit front end sets center fuel shower nozzle and several secondary fuel shower nozzles；Between in hybrid channel
Every and be evenly arranged several three-level fuel guns and secondary-wind spray gun, center fuel conveyance conduit and three-level fuel gun are all connected with firing
Expect feedway；First air passage and secondary-wind spray gun are all connected with aoxidizing agent feeding device.
Further, interior fire resisting sleeve and outer fire resisting sleeve, interior fireproof sleeve are arranged on First air passage successively from inside to outside
Gap is left between cylinder and outer fire resisting sleeve, the gap forms hybrid channel.
Further, recirculation line is circumferentially uniformly arranged on outer fireproof sleeve cylinder, in axis direction, recirculation line
Have 15~45 ° of angles between the axis of hybrid channel, in the plane of vertical axis, recirculation line and hybrid channel it is interior
Side wall is tangent；The leading section of three-level fuel gun and secondary-wind spray gun is no more than the outlet of recirculation line.
Further, the front end of interior fire resisting sleeve and outer fire resisting sleeve flushes and is respectively provided with taper enlarging.
Further, the front end of three-level fuel gun is three-level fuel nozzle, and the front end of secondary-wind spray gun is Secondary Air shower nozzle,
Three-level fuel nozzle is identical with the shape of Secondary Air shower nozzle and front end be respectively provided with for formed air-curtain type injection combustion gas several
Split channel.
Further, the exit of First air passage is provided with swirl-flow devices；Swirl-flow devices are the adjustable rotation of swirl strength
Flow device.
Further, secondary fuel shower nozzle is arranged circumferentially around center fuel shower nozzle, and secondary fuel shower nozzle is located at
The rear side of center fuel shower nozzle；Secondary fuel shower nozzle includes spray orifice that is axially distributed and being obliquely installed towards swirl-flow devices.
Further, equipped with steady combustion tooth and bluff body reflux on center fuel shower nozzle.
Further, fuel supply system is connected by three-level fuel tube with three-level fuel header, three-level fuel
Header is connected with three-level fuel gun；Between center fuel conveyance conduit and fuel supply system and three-level fuel tube and
Valve is respectively provided between fuel supply system.
Further, oxidation agent feeding device passes through valve and Secondary Air header connecting secondary wind spray gun.
Compared with prior art, the present invention has technique effect beneficial below：
The present invention makes air and combustion gas along axle by setting center fuel conveyance conduit, First air passage and hybrid channel
To three-level distribution is carried out, by setting built-in recirculation line, then the flue gas of initial combustion circulates in burner hearth bottom, by interior
The flue gas recirculation passage put forms eddy flow, and is mixed with three-level fuel and Secondary Air, dilutes the oxygen concentration of mixed gas,
So as to inhibit NOXFormation.Therefore, NO of the present inventionXFormed in the initial combustion area of oxidisability, in reburning zone and center fuel
Mix and be reduced, thoroughly reduced in the burning-out zone that Secondary Air and three-level fuel spray into, and by unburned fuel and the thorough after-flames of CO,
The present invention can be effectively improved combustion position, high combustion efficiency, significantly reduce the concentration of nitrogen oxides.
Further, the present invention is not only divided by fire resisting sleeve in setting and outer fire resisting sleeve, inside and outside two fire resisting sleeves
Every First air, Secondary Air and flue gas, while the effect surely fired also is played after combustion.
Further, angle be present between recirculation line of the present invention and hybrid channel axis, flue gas can be made to enter mixing
Flowed up after passage, avoid the outer wall off-energy of fire resisting sleeve in 90 ° of direct vertical shocks of flue gas；Recirculation line is hanging down
The in-plane of straight axis and hybrid channel are tangent, and flue gas passes through the direction of motion after recirculation line and the inner side of hybrid channel
Wall is tangent, prevent flue gas because bump against interior fire resisting sleeve outer wall and loss section transfer energy.
Further, the present invention in the front end of interior fire resisting sleeve and outer fire resisting sleeve by setting diameter along burner axis
To the taper enlarging goed deep into burner hearth direction and gradually expanded, beneficial to flue gas recirculation.
Further, three-level fuel nozzle of the present invention is identical with the shape of Secondary Air shower nozzle, and front end is respectively provided with several points
Circulation road, air-curtain type injection, and injection flue gas recycled can be formed.
Further, for the present invention by setting swirl-flow devices, secondary fuel produces eddy flow with First air by swirl-flow devices
Burner hearth is sprayed into, the Central backflow area in freeze profile into combustion product, unreacted air and fuel is preheated and diluted,
Stable flame is formed under high-speed jet.
Further, the present invention is by by the rear side of the centrally disposed fuel nozzle of secondary fuel shower nozzle, realizing that center is fired
The axially staged burning of material and secondary fuel；The spray orifice of both direction is set on secondary fuel shower nozzle, and combustion gas is fired by two level
Expect the axially injection of a shower nozzle part, the circumferential inverse Whirl deposite tank direction of a part is sprayed.
Further, the present invention surely fires tooth and bluff body reflux by setting, and center combustion gas is formed backflow, so as to
Suction smoke backflow can be rolled up, forms a small flue gas recirculation region.
Brief description of the drawings
Fig. 1 is the main sectional view of the present invention.
Fig. 2 is the sectional view of bowing of the present invention.
Fig. 3 (a) is the schematic diagram of the secondary fuel shower nozzle of the present invention, and Fig. 3 (b) is the signal of spray orifice on secondary fuel shower nozzle
Figure.
Fig. 4 (a) is the front view of the three-level fuel nozzle of the present invention, and Fig. 4 (b) is side view, and Fig. 4 (c) is top view.
Fig. 5 (a) is the front view of the center fuel shower nozzle of the present invention, the top view of fuel nozzle centered on Fig. 5 (b).
1- center fuels conveyance conduit, 2- oxidations agent feeding device, 3- three-level fuel header, 4- Secondary Airs header, 5- stoves
The outer fire resisting sleeve of wall, 6- three-levels fuel gun, 7- three-levels fuel nozzle, 8-, 9- hybrid channels, 10- swirl-flow devices, the combustion of 11- two levels
Expect shower nozzle, 12- bluff bodies reflux, 13- center fuels shower nozzle, fire resisting sleeve, 15- Secondary Airs shower nozzle, the spray of 16 Secondary Airs in 14-
Rifle, 17- recirculation lines, 18- three-levels fuel tube, 19- headers sleeve, 20- First airs sleeve, 21- valves, 22- combustions
Material feedway, 23- surely fire tooth, 24- First airs passage, 25- spray orifices.
Embodiment
The present invention is described in further details below in conjunction with the accompanying drawings.
Referring to Fig. 1 to Fig. 5 (b), it is defeated that the present invention includes burner hearth, furnace wall 5 and the center fuel that is arranged successively from inside to outside
Pipeline 1, First air passage 24 and hybrid channel 9 are sent, before center fuel conveyance conduit 1, First air passage 24 and hybrid channel 9
End both passes through furnace wall 5 and stretched into burner hearth.
The front end of center fuel conveyance conduit 1 sets center fuel shower nozzle 13 and several secondary fuel shower nozzles 11；Mixing is logical
It is spaced in road 9 and is evenly arranged several three-level fuel guns 6 and secondary-wind spray gun 16.The three-level that three-level fuel gun 6 passes through ring-type
Fuel header 3 is connected with three-level fuel tube 18, defeated by the unified supply fuel of fuel ring-type header 3, center fuel three times
Pipeline 1 and three-level fuel tube 18 is sent to connect fuel supply system 22 by valve 21；The connection of secondary-wind spray gun 16 two
Secondary wind header 4, First air passage 24 connect First air sleeve 20, and Secondary Air header 4 and First air sleeve 20 pass through valve 21
Connection oxidation agent feeding device 2.Valve 21 is magnetic valve.
Referring to Fig. 2, interior fire resisting sleeve 14 and outer fire resisting sleeve 8 are arranged on First air passage 24 successively from inside to outside, it is interior resistance to
Gap is left between fiery sleeve 14 and outer fire resisting sleeve 8, the gap forms hybrid channel 9.Interior fire resisting sleeve 14 and outer fireproof sleeve
The front end of cylinder 8 flushes and is respectively provided with taper enlarging, that is, it is identical to go deep into furnace depth, with refractory material, such as AZS bricks, just
Beautiful brick or Direct bond magnesia-chrome brick etc. are made.It is logical that some sections of recycling are circumferentially evenly arranged with the side wall of outer fire resisting sleeve 8
Road 17；The leading section of three-level fuel gun 6 and secondary-wind spray gun 16 is no more than the outlet of recirculation line 17.Recirculation line 17
Close to furnace wall 5, as shown in figure 1, the center line of recirculation line 17 there are 15~45 ° of angles along axis z directions, flue gas can be entered
Flowed up behind hybrid channel 9, avoid the outer wall off-energy of fire resisting sleeve 14 in 90 ° of direct vertical shocks of flue gas；Come from Fig. 2
See, recirculation line 17 direction of center line and hybrid channel 9 on x/y plane is tangent, i.e., flue gas by recirculation line 17 after
The direction of motion and the madial wall of hybrid channel 9 it is tangent, prevent flue gas because bump against interior fire resisting sleeve 14 outer wall and loss section
Transfer energy, the present invention make flue gas recycled form rotation using cross section for this special channel shape of oblique upper aperture of rectangle
Stream, eddy flow direction is consistent with First air air swirl direction, and the fuel three times using the injection of three-level fuel gun 6 and Secondary Air spray
The Secondary Air injection that rifle 16 sprays.
The front end of three-level fuel gun 6 is three-level fuel nozzle 7, and the front end of secondary-wind spray gun 16 is Secondary Air shower nozzle 15, three
Level fuel nozzle 7 is identical with the shape of Secondary Air shower nozzle 15, using special shape, by taking three-level fuel nozzle 7 as an example, i.e., from
Pipe transition with three-level fuel gun 6 is that the outlet of built-in multiple split channels is shower nozzle and its outlet of flat rectangle
Rectangular area is less than the pipe cross-sectional area of three-level fuel gun 6, combustion gas is formed air-curtain type injection, is arranged in and each follows again
Ring passage 17 export lower edge, be uniformly distributed circumferentially and with the arranged for interval of secondary-wind spray gun 16.
The exit of First air passage 24 is provided with swirl-flow devices 10；Swirl-flow devices 10 are the adjustable eddy flow of swirl strength
Device.Secondary fuel shower nozzle 11 is arranged circumferentially around center fuel shower nozzle 13；Secondary fuel shower nozzle 11 includes axially distributed
And the spray orifice 25 being obliquely installed towards swirl-flow devices 10, its combustion gas are axially sprayed by the part of secondary fuel shower nozzle 11, one
A circumferential inverse Whirl deposite tank direction is divided to spray.
Equipped with steady combustion tooth 23 and bluff body reflux 12 on center fuel shower nozzle 13.Bluff body reflux 12 is not limited to
The taper bluff body with axial hole shown in accompanying drawing, or the reflux that the other shapes of bluff body such as disc type is formed.
Center fuel shower nozzle 13 compared to swirl-flow devices 10 and secondary fuel shower nozzle 11 it is more prominents to burner hearth, so as to realize center fuel and
The axially staged burning of secondary fuel.
The present invention can realize combustion gas, air Accurate Classification and built-in flue gas recirculation, its main course of work and original
Reason：
Referring to Fig. 2, combustion gas and a Whirl deposite tank contrary that secondary fuel shower nozzle 11 circumferentially sprays, three-level fuel gun 6 spray
Three-level fuel and the Secondary Air injection flue gas recycled that sprays of secondary-wind spray gun 16, flue gas recycled passes through recirculation line 17
Form direction and First air direction identical eddy flow.
Referring to Fig. 3 (a) and Fig. 3 (b), the longitudinal section of secondary fuel shower nozzle 11 of the invention is trapezoidal, makes a part of combustion gas axle
To jet, a part of combustion gas circumference jet mixes with a Whirl deposite tank.
Referring to Fig. 4 (a) to Fig. 4 (c), three-level fuel gun 6 of the invention and secondary-wind spray gun 16 make pipe by special construction
Interior gas is changed into air-curtain type injection, and injection flue gas recycled.Its shower nozzle sectional area is less than three-level fuel gun 6 and secondary-wind spray gun
The sectional area of 16 pipe, so as to increase the flow velocity of injection.
Referring to Fig. 5 (a) and Fig. 5 (b), center fuel shower nozzle 13 of the invention is provided centrally with bluff body smooth combustion apparatus, edge
Provided with steady combustion tooth 23, many axial apertures are provided with bluff body reflux 12, surely the shape of combustion tooth 23 and bluff body can have more
Kind, it is not limited to shown in figure.
The present invention is combined using combustion gas, air Accurate Classification, built-in flue gas recirculation and swirl flow combustion technology, there is provided one
Three-level is distributed vertically for kind combustion gas, air, the low NO of built-in flue gas recirculationXRotational flow gas-fired combustor, i.e. secondary fuel are first
With excessive First air mixed combustion, NOXFormed in such as Tu1Zhong A areas of the initial combustion area of oxidisability, center fuel go deep into burner hearth compared with
Far, mixed with flue gas it is slower, when flue gas and the center fuel mixed combustion after secondary fuel burning, the NO that is generatedXMeeting exists
Under high temperature by hydro carbons and CO etc. reduce, i.e., mix and be reduced with center fuel in reburning zone such as Tu1Zhong B areas, Secondary Air with
The burning-out zone such as Tu1Zhong C areas that three-level fuel sprays into thoroughly reduce, and by unburned fuel and the thorough after-flames of CO, smoke backflow direction
And combustion gas and air flow are as shown by the arrows in Figure 1.Wherein, the flue gas of burner hearth bottom circulation passes through built-in flue gas recirculation
Passage 17 forms eddy flow, and is mixed with three-level fuel and Secondary Air, the oxygen concentration of mixed gas is diluted, so as to inhibit
NOXFormation.Secondary fuel and First air produce eddy flow by swirl-flow devices 10 and spray into burner hearth, in freeze profile into combustion product
Central backflow area, unreacted air and fuel are preheated and diluted, stable flame is formed under high-speed jet.Its
In, First air by the direction that is rotated after swirl-flow devices 10 as shown in the curved arrow in Fig. 2, what a part of second gas burning sprayed
Direction is as shown in the straight arrows in Fig. 2, and First air eddy flow direction contrary, strengthens mixing, beneficial to lighting.Center fuel shower nozzle
Bluff body reflux 12 and steady combustion tooth 23 in 13 make center combustion gas form backflow, so as to can also roll up suction smoke backflow, form one
Individual small flue gas recirculation region.Inside and outside two fire resisting sleeves are not only separated by First air, Secondary Air and flue gas, while also exist
The effect surely fired is played after burning.The present invention can be effectively improved combustion position, high combustion efficiency, significantly reduce nitrogen oxygen
The concentration of compound.
Claims (10)
1. the low nitrogen rotational flow gas-fired combustor of flue gas recirculation built in gas-air Accurate Classification, it is characterised in that：Including burner hearth,
Furnace wall (5) and the center fuel conveyance conduit (1) being arranged successively from inside to outside, First air passage (24) and hybrid channel (9),
The front end of center fuel conveyance conduit (1), First air passage (24) and hybrid channel (9) both passes through furnace wall (5) and stretched into burner hearth；
Some sections of recirculation lines (17) are provided with the lateral wall of hybrid channel (9), recirculation line (17) is located in burner hearth；
Center fuel conveyance conduit (1) front end sets center fuel shower nozzle (13) and several secondary fuel shower nozzles (11)；Mixing
It is spaced in passage (9) and is evenly arranged several three-level fuel guns (6) and secondary-wind spray gun (16), center fuel conveyance conduit
(1) and three-level fuel gun (6) is all connected with fuel supply system (22)；First air passage (24) and secondary-wind spray gun (16) are all connected with
Aoxidize agent feeding device (2).
2. the low nitrogen rotational flow gas-fired combustor of flue gas recirculation built in gas-air Accurate Classification according to claim 1,
It is characterized in that：It is arranged interior fire resisting sleeve (14) and outer fire resisting sleeve (8) on First air passage (24) successively from inside to outside, it is interior resistance to
Gap is left between fiery sleeve (14) and outer fire resisting sleeve (8), the gap forms hybrid channel (9).
3. the low nitrogen rotational flow gas-fired combustor of flue gas recirculation built in gas-air Accurate Classification according to claim 2,
It is characterized in that：Recirculation line (17) is circumferentially uniformly arranged on outer fireproof sleeve cylinder (8), logical in axis direction, recycling
There are 15~45 ° of angles, in the plane of vertical axis, recirculation line (17) between the axis of road (17) and hybrid channel (9)
It is tangent with the madial wall of hybrid channel (9)；The leading section of three-level fuel gun (6) and secondary-wind spray gun (16) is no more than recycling
The outlet of passage (17).
4. the low nitrogen rotational flow gas-fired combustor of flue gas recirculation built in gas-air Accurate Classification according to claim 2,
It is characterized in that：The front end of interior fire resisting sleeve (14) and outer fire resisting sleeve (8) flushes and is respectively provided with taper enlarging.
5. the low nitrogen rotational flow gas-fired combustor of flue gas recirculation built in gas-air Accurate Classification according to claim 1,
It is characterized in that：The front end of three-level fuel gun (6) is three-level fuel nozzle (7), and the front end of secondary-wind spray gun (16) is Secondary Air
Shower nozzle (15), three-level fuel nozzle (7) is identical with the shape of Secondary Air shower nozzle (15) and front end is respectively provided with for forming air-curtain type
Spray several split channels of combustion gas.
6. the low nitrogen rotational flow gas-fired combustor of flue gas recirculation built in gas-air Accurate Classification according to claim 1,
It is characterized in that：The exit of First air passage (24) is provided with swirl-flow devices (10)；Swirl-flow devices (10) are that swirl strength can
The cyclone of tune.
7. the low nitrogen rotational flow gas-fired combustor of flue gas recirculation built in gas-air Accurate Classification according to claim 6,
It is characterized in that：Secondary fuel shower nozzle (11) is arranged circumferentially around center fuel shower nozzle (13), and secondary fuel shower nozzle
(11) it is located at the rear side of center fuel shower nozzle (13)；Secondary fuel shower nozzle (11) includes axially distributed and towards swirl-flow devices
(10) spray orifice (25) being obliquely installed.
8. the low nitrogen rotational flow gas-fired combustor of flue gas recirculation built in gas-air Accurate Classification according to claim 1,
It is characterized in that：Equipped with steady combustion tooth (23) and bluff body reflux (12) on center fuel shower nozzle (13).
9. the low nitrogen rotational flow gas-fired combustor of flue gas recirculation built in gas-air Accurate Classification according to claim 1,
It is characterized in that：Fuel supply system (22) is connected by three-level fuel tube (18) with three-level fuel header (3), three-level
Fuel header (3) is connected with three-level fuel gun (6)；Between center fuel conveyance conduit (1) and fuel supply system (22) and
Valve is respectively provided between three-level fuel tube (18) and fuel supply system (22).
10. the low nitrogen rotational flow gas-fired combustor of flue gas recirculation built in gas-air Accurate Classification according to claim 1,
It is characterized in that：Oxidation agent feeding device (2) passes through valve and Secondary Air header (4) connecting secondary wind spray gun (16).
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Cited By (7)
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| CN108730978A (en) * | 2018-05-18 | 2018-11-02 | 浙江炬烁热能设备制造有限公司 | The low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove |
| CN109631036A (en) * | 2019-01-14 | 2019-04-16 | 唐山亿昌热能科技有限公司 | The combustion method and matched combustion head and burner of a kind of ultralow nitrogen oxides |
| CN110107898A (en) * | 2019-05-30 | 2019-08-09 | 唐山金沙燃烧热能股份有限公司 | A kind of coke-stove gas low NO |
| CN111609402A (en) * | 2020-05-09 | 2020-09-01 | 北京泷涛环境科技有限公司 | Burner and gas boiler |
| CN111780094A (en) * | 2020-07-17 | 2020-10-16 | 北京泷涛环境科技有限公司 | Deviating equivalence ratio ultra-low nitrogen combustion device and combustion method |
| CN111895410A (en) * | 2020-06-29 | 2020-11-06 | 欧保(中国)环境工程股份有限公司 | Vector control gas low-nitrogen burner |
| CN112050215A (en) * | 2020-09-30 | 2020-12-08 | 江苏泷涛环境技术有限公司 | Efficient air multistage injection smoke internal circulation low-nitrogen combustor and application |
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