CN208859604U - For gas fired-boiler smoke backflow internal-external double circulation low NO and gas fired-boiler - Google Patents
For gas fired-boiler smoke backflow internal-external double circulation low NO and gas fired-boiler Download PDFInfo
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- CN208859604U CN208859604U CN201821934006.6U CN201821934006U CN208859604U CN 208859604 U CN208859604 U CN 208859604U CN 201821934006 U CN201821934006 U CN 201821934006U CN 208859604 U CN208859604 U CN 208859604U
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Abstract
The utility model provides a kind of for gas fired-boiler smoke backflow internal-external double circulation low NO and a kind of gas fired-boiler, the burner includes burner body, nozzle assembly is provided on burner body, an air hose is arranged on the main tracheae of burner body, cyclone is provided between main tracheae and air hose, using cyclone can by gas using cyclone mode spray participate in burning, this cyclone mode can gas fired-boiler freeze profile at interior circulation combustion system.The gas fired-boiler is provided with flue gas recirculation pipe, to realize the outer circulation of flue gas.The utility model is using multiple technologies such as the inside and outside circulation of flue gas, rotating jet, cross jet and the steady flame devices of horn mouth formula, the purpose for realizing low-temperature burning, stablizing burning, improving temperature uniformity in burner hearth, the generation and discharge for inhibiting to greatest extent and reducing nitrogen oxides, flue gas recirculation rate may be up to 20~40%, and furnace outlet nitrous oxides concentration is lower than 30mg/m3。
Description
Technical field
The utility model relates to technical field of combustion equipment, more specifically, in particular to a kind of to be used for gas fired-boiler cigarette
Gas reflux internal-external double circulation low NO and a kind of gas fired-boiler.
Background technique
In today that environment, the energy, economic conflict are got worse, the energy-saving and emission-reduction work of all trades and professions has been compeled in eyebrow
Eyelash.Under energy-saving and emission-reduction pressure, pot furnace fuel is changed to natural gas by traditional fire coal, fuel oil, allows for natural gas pot in this way
The number of users of furnace is increasing.
Although natural gas has the advantages that low-sulfur compound and low dust emission, natural gas are burning as fuel
In the process or a large amount of nitrogen oxides (NO can be generatedX), nitrogen oxides is still the master that environmental pollution is caused in combustion product
Want one of pollutant.
From the point of view of the natural gas boiler operating condition detection data announced according to current environmental protection administration, most of natural gas boiler
The concentration of emission of nitrogen oxides is in 300mg/m3Left and right, in all natural gas boiler of investigation, discharged nitrous oxides concentration is small
In 200mg/m3Natural gas boiler only account for 35% or so., it is specified that existing gas fired-boiler in new boiler emission execution standard
Discharged nitrous oxides limitation with newly constructed boiler is respectively 200mg/m3And 150mg/m3.Another place environmental protection administration is for locality
Environmental pollution states put into effect more stringent local emission standard of air pollutants for boilers, stringenter control nitrogen successively
The discharge of oxide, the gas fired-boiler not up to standard to discharged nitrous oxides need to force to carry out low nitrogen burning transformation.
For example, Beijing's newly constructed boiler executes nitrogen oxides 30mg/m at present3Emission limit, to be located at high pollution fuel
Active boiler in the area Jin Ran, Beijing execute nitrogen oxides 80mg/m3Emission limit.Based under this background, existing low nitrogen
Burner such as uses low oxygen combustion, Researched of Air Staging Combustion Burning Pulverized Coal, fuel-staged combustion, flue gas recirculation burning in practical emission reduction application
Do not do well in the process, each there are some problems.Although fuel staging and air classification are to reduce nitrogen oxides
Effective means, but to reach the discharge of very low nitrogen oxides, effect is still to be improved.
In addition, if while reducing discharged nitrous oxides, heat loss due to exhaust gas also can when using low oxygen combustion scheme
It reduces, fuel easily occurs if Furnace Aerodynamic Field tissue is bad although being conducive to raising boiler thermal efficiency in this way
Imperfect combustion, there is the problem of efficiency of combustion reduction.And flue gas recirculation method is just few especially suitable for using nitrogen content
Natural gas, wherein the discharge of nitrogen oxides can be significantly reduced, but current study show that flue gas recirculation rate no more than 20%,
General control is 10~20%, if flue gas recirculation rate is excessively high, it will cause furnace temperature to decline excessively, and burning will occur not in furnace
Stablize, heat loss due to unburned gas just will increase.
Therefore, it is necessary to combine Theory of Combustion to organically combine using multinomial low-NO_x combustion technology, can reach to greatest extent
The generation and discharge for inhibiting and reducing nitrogen oxides.Though there is some current burners are comprehensive to use a variety of low-NO_x combustion technologies,
It is that will cause the problems such as burner figure is larger, structure is more complex, adjusting is difficult and combustion instability in this way, and nitrogen oxidation
The concentration of emission reducing effect of object is also not very ideal.
So how to design a kind of easy to operate, small, discharged nitrous oxides concentration under the premise of guaranteeing efficiency of combustion
Low low NO becomes those skilled in the art's urgent problem to be solved.
Utility model content
In view of the deficiencies of the prior art, the utility model provides a kind of combustion gas efficiently, energy saving and low pollutant emission
Low NO can be realized the inside and outside circulation of flue gas, can inhibit to the maximum extent and the generation of reduction nitrogen oxides and row
It puts.
To achieve the goals above, the utility model provides the following technical solutions:
Scheme one
One kind being used for gas fired-boiler smoke backflow internal-external double circulation low NO, comprising:
Burner body, the burner body include main tracheae, and one end of the main tracheae is provided with block plate simultaneously
It is formed with closed end, open be arranged of the other end of the main tracheae is simultaneously formed with open end, in being connected with combustion on the main tracheae
Gas import, the fuel gas inlet are arranged close to the closed end；
Nozzle assembly, the nozzle assembly include the nozzle body of tray type structure, are provided on Yu Suoshu nozzle body
Fuel gas injection pipe, the fuel gas injection pipe are straight pipe type structure, and one end of the fuel gas injection pipe is injection pipe air inlet, it is another
One end is injection pipe gas outlet, and the nozzle body is set on the open end, and the nozzle body is towards the main tracheae
One side be medial surface, the another side of the nozzle body is lateral surface towards burner hearth, and the injection pipe air inlet opens up
In on the medial surface, the injection pipe gas outlet is opened on the lateral surface, and the fuel gas injection pipe is from the injection pipe
Air inlet is directed toward the injection pipe gas outlet, its axis is gradually distance from the center line of the nozzle body, the fuel gas injection pipe
Multiple, whole fuel gas injection pipe rings is provided with to be arranged at equal intervals around the center line of the nozzle body；
Air hose, the air hose are sheathed on the outside of the main tracheae, the medial surface of the air hose and the main gas
Interval is arranged and is formed with air passing clearances between the lateral surface of pipe, and the air hose is envelope close to one end of the closed end
Closed type structure, the air hose other end are Open architecture and are formed with air outlet slit；
Cyclone, the cyclone include for covering the casing being set on the open end of the main tracheae, in the set
Swirl vane is provided on the lateral surface of pipe, the swirl vane is provided with multiple, whole swirl vanes in the set
It is arranged at equal intervals on the lateral surface of pipe, interval is arranged and is formed with eddy flow gap, edge between two adjacent swirl vanes
The axis direction of described sleeve pipe, the eddy flow gap side be the rotational flow inlet communicated with the air passing clearances, it is described
The other side in eddy flow gap is the eddy flow outlet being arranged towards burner hearth, and the eddy flow gap is directed toward its eddy flow from its rotational flow inlet and is gone out
Mouth is, around the spiral line type channel design of described sleeve pipe, the cyclone is set in the air passing clearances, the rotation
The medial surface for flowing the lateral surface and the air hose of device offsets.
Preferably, the master is intratracheally provided with hollow cylindrical tube, the lateral surface of the cylindrical tube and the main tracheae
Medial surface between interval be arranged and be formed with gas circulation gap；
Coaxial interior circulation openings are provided on the nozzle body, one end of the cylindrical tube is plugged in described
In circulation openings, the fuel gas injection pipe is communicated with the gas circulation gap.
Preferably, the fuel gas injection pipe is provided with 20 to 40, the pipe axis and the nozzle of the fuel gas injection pipe
It is in 15 °~40 ° of angle between the center line of main body.
Preferably, the swirl vane is axial arcuation blade, and the swirl vane is provided with 10 to 20.
Preferably, the swirl vane on the lateral surface of described sleeve pipe at equal intervals setting and it is two adjacent described in
Overlapping, its overlapping angle are 20 °~45 ° between swirl vane.
Preferably, angle overlap of the end outlet angle of the swirl vane between two adjacent swirl vanes
1.3~2 times of degree.
It preferably, further include having steady flame device, the steady flame device is bell-mouth structure of air, the osculum end of the steady flame device
It is sheathed on the air outlet slit of the air hose, the big opening end of the steady flame device is arranged towards burner hearth direction.
Scheme two
A kind of gas fired-boiler includes furnace body, and the furnace body has burner hearth, and the side of the furnace body offers and the furnace
The flame jet port that thorax communicates, the other side of the furnace body offer the smoke exhaust pipe for flue gas output.
Gas fired-boiler provided by the utility model further include:
It is described to be used for gas fired-boiler flue gas as above-mentioned for gas fired-boiler smoke backflow internal-external double circulation low NO
The internal-external double circulation low NO that flows back includes main tracheae, and the head end of the main tracheae is provided with nozzle assembly, the main gas
One end that pipe is provided with the nozzle assembly is arranged with air hose, is formed with air stream between the main tracheae and the air hose
Logical gap, the head end of the main tracheae are docked with the flame jet port；
Air blower for being compressed to gas, the air blower include fan inlet and air blower outlet
Mouthful, be connected with cigarette wind mixing tube with the air blower gas outlet, the cigarette wind mixing tube docked with the air hose and with it is described
Air passing clearances connection；
It is connected with flue gas recirculation pipe with the smoke exhaust pipe, the flue gas recirculation pipe is docked with the fan inlet；
For conveying the main air hose of fresh air, the main air hose is docked with the fan inlet.
Preferably, the utility model further includes having dehydration device, and the dehydration device is docked with the fan inlet,
The main air hose and the flue gas recirculation pipe are connect by the dehydration device with the air blower.
Preferably, it is provided with steady flame device on the air outlet slit of the air hose, is provided with igniting on the steady flame device
Device and flame detecting device；The steady flame device is assemblied on the flame jet port.
The utility model provides a kind of for gas fired-boiler smoke backflow internal-external double circulation low NO and one kind
The gas fired-boiler of said burner is installed, in the present invention, it is low that this is used for gas fired-boiler smoke backflow internal-external double circulation
Nitrogen burner includes burner body, and nozzle assembly is provided on burner body, on the main tracheae of burner body
It is arranged with an air hose, cyclone is provided between main tracheae and air hose, it can be by gas using rotation using cyclone
Stream mode spray participation burning, this cyclone mode can gas fired-boiler freeze profile at interior circulation combustion system.It should
Gas fired-boiler is provided with flue gas recirculation pipe, to realize the outer circulation of flue gas.By said structure design, the utility model is used
The multiple technologies such as the inside and outside circulation of flue gas, rotating jet, cross jet and the steady flame device of horn mouth formula realize low-temperature burning, steady
Fixed burning, the purpose for improving temperature uniformity in burner hearth, inhibit to greatest extent and reduce the generation and discharge of nitrogen oxides, flue gas
Cycling rate may be up to 20~40%, and furnace outlet nitrous oxides concentration is lower than 30mg/m3。
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide a further understanding of the present invention, this is practical
Novel illustrative embodiments and their description are not constituteed improper limits to the present invention for explaining the utility model.
Wherein:
Fig. 1 is the office that gas fired-boiler smoke backflow internal-external double circulation low NO is used in an embodiment of the present invention
Portion's structural schematic diagram；
Fig. 2 is the structural schematic diagram of nozzle assembly in an embodiment of the present invention；
Fig. 3 is the cross-sectional view in Fig. 2 along B-B；
Fig. 4 is the structural schematic diagram of steady flame device in an embodiment of the present invention；
Fig. 5 be added in Fig. 1 after steady flame device along A to structural schematic diagram；
Fig. 6 is the structural schematic diagram of cyclone in an embodiment of the present invention；
Fig. 7 is the structure schematic diagram of gas fired-boiler in an embodiment of the present invention；
Description of symbols:
Main tracheae 1, block plate 2, fuel gas inlet 3, nozzle body 4, fuel gas injection pipe 5, air hose 6, casing 7, eddy flow leaf
Piece 8, cylindrical tube 9, steady flame device 10, furnace body 11, smoke exhaust pipe 12, air blower 13, cigarette wind mixing tube 14, flue gas recirculation pipe 15, master
Air hose 16, dehydration device 17, igniter 18, flame detecting device 19.
Specific embodiment
The utility model will be described in detail below with reference to the accompanying drawings and embodiments.Each example passes through the utility model
The mode of explanation provide rather than limit the utility model.In fact, those skilled in the art will be clear that, this reality is not being departed from
In the case where with novel range or spirit, it can modify in the present invention and modification.For example, being illustrated or described as one
The feature of a part of a embodiment can be used for another embodiment, to generate another embodiment.Thus, it may be desirable to
The utility model includes the such modifications and variations being included into the range of the following claims and their equivalents.
In the description of the present invention, term " longitudinal direction ", " transverse direction ", "upper", "lower", "front", "rear", "left", "right",
The orientation or positional relationship of the instructions such as "vertical", "horizontal", "top", "bottom" is to be based on the orientation or positional relationship shown in the drawings,
It is merely for convenience of description the utility model rather than requires the utility model that must be constructed and operated in a specific orientation, therefore
It should not be understood as limiting the present invention.Term used in the utility model " connected ", " connection " shall be understood in a broad sense,
For example, it may be being fixedly connected, may be a detachable connection；It can be directly connected, it can also be indirect by intermediate member
It is connected, for the ordinary skill in the art, can understands the concrete meaning of above-mentioned term as the case may be.
Fig. 1 is please referred to Fig. 7, wherein Fig. 1 is in an embodiment of the present invention for inside and outside gas fired-boiler smoke backflow
The partial structural diagram of Two-way Cycle low NO；Fig. 2 is the structural representation of nozzle assembly in an embodiment of the present invention
Figure；Fig. 3 is the cross-sectional view in Fig. 2 along B-B；Fig. 4 is the structural schematic diagram of steady flame device in an embodiment of the present invention；Fig. 5
For added in Fig. 1 after steady flame device along A to structural schematic diagram；Fig. 6 is the knot of cyclone in an embodiment of the present invention
Structure schematic diagram；Fig. 7 is the structure schematic diagram of gas fired-boiler in an embodiment of the present invention.
The utility model discloses one kind to be used for gas fired-boiler smoke backflow internal-external double circulation low NO, practical at this
In a novel embodiment, it includes such as lower component that this, which is used for gas fired-boiler smoke backflow internal-external double circulation low NO:
1, burner body
Burner body includes main tracheae 1, and main tracheae 1 uses straight circular tube structure, and one end of main tracheae 1 is provided with envelope
Baffle 2 is simultaneously formed with closed end, and block plate 2 is arranged in one end of main tracheae 1 and forms air-tightness connection structure with main tracheae 1,
It can guarantee that the combustion gas in main tracheae 1 is merely able to export from the other end of main tracheae 1 in this way.
The other end of main tracheae 1 is open structure design, which is the open end of main tracheae 1, the utility model
Other assemblies can be set for realizing the output and burning of combustion gas in open end.
In being connected with fuel gas inlet 3 on main tracheae 1, fuel gas inlet 3 is arranged close to closed end, external air supply system and combustion gas
Import 3 is docked, and can be entered in main tracheae 1 from air supply system by fuel gas inlet 3, combustion gas.
2, nozzle assembly
Nozzle assembly includes the nozzle body 4 of tray type structure, and nozzle body 4 is integrally formed using refractory material, nozzle
Main body 4 carries out structure design according to the inner edge chamfered shape of open end on main tracheae 1, so that nozzle body 4 is installed
The medial surface of open end forms air-tightness connection structure on to main tracheae 1, on its exterior contour and main tracheae 1.
In being provided with fuel gas injection pipe 5 on nozzle body 4, fuel gas injection pipe 5 is that through hole processing technology takes shape in nozzle
Tubular structure in main body 4.
In the present invention, fuel gas injection pipe 5 is straight pipe type structure, and one end of fuel gas injection pipe 5 is injection pipe air inlet
Mouthful, its other end be injection pipe gas outlet, nozzle body 4 is set on open end, and nozzle body 4 is towards the side of main tracheae 1
Face is medial surface, and the another side of nozzle body 4 is lateral surface towards burner hearth, and injection pipe air inlet is opened on medial surface, is sprayed
It penetrates pipe gas outlet to be opened on lateral surface, 5 self-injection pipe air inlet of fuel gas injection pipe is directed toward injection pipe gas outlet, its axis gradually
Center line far from nozzle body 4, fuel gas injection pipe 5 are provided with multiple, whole fuel gas injection pipes 5 around nozzle body 4
Center line is arranged at equal intervals.
In the present invention, fuel gas injection pipe 5 is provided with 20 to 40, and fuel gas injection pipe 5 is best to be arranged 30
Quantity is set.
It limits herein: being in 15 °~40 ° of angle between the pipe axis of fuel gas injection pipe 5 and the center line of nozzle body 4,
Wherein to be in 30 ° of angles as optimal design.
3, air hose
Air hose 6 is sheathed on the outside of main tracheae 1, and the length of air hose 6 is less than the length of main tracheae 1, air hose 6 it is interior
Interval is arranged and is formed with air (namely combustion-supporting gas) passage gaps between side and the lateral surface of main tracheae 1, and air hose 6 leans on
One end of closed end is enclosed construction on nearly main tracheae 1, and 6 other end of air hose is Open architecture and is formed with air and goes out
Mouthful, combustion-supporting gas, which enters then to export from air outlet slit in air hose 6, participates in burning.
4, cyclone
The effect of cyclone is the circulating form for changing the combustion-supporting gas to circulate in air hose 6, by the combustion-supporting of straight line output
Gas is changed to cyclone mode and is exported.
Specifically, cyclone includes for covering the casing 7 being set on the open end of main tracheae 1, the internal diameter of casing 7 and master
The outer diameter of tracheae 1 is identical, can guarantee in this way 7 sets of casing be set on main tracheae 1 after stability and firm degree.
In being provided with swirl vane 8 on the lateral surface of casing 7, swirl vane 8 is provided with multiple, whole swirl vanes 8
In being arranged at equal intervals on the lateral surface of casing 7, interval is arranged and is formed with eddy flow gap between two adjacent swirl vanes 8,
Along the axis direction of casing 7, the side in eddy flow gap be the rotational flow inlet communicated with air passing clearances, eddy flow gap it is another
Side is the eddy flow outlet being arranged towards burner hearth, and the spiral shell that the outlet of its eddy flow is annular sleeve 7 is directed toward in eddy flow gap from its rotational flow inlet
Spin line type channel design, cyclone are set in air passing clearances, the medial surface phase of the lateral surface and air hose 6 of cyclone
It supports.
In the present invention, swirl vane 8 is axial arcuation blade, and swirl vane 8 is provided with 10 to 20, eddy flow leaf
The best setting number of piece 8 is 15.Certainly, swirl vane 8 can also be big according to the gap between main tracheae 1 and air hose 6
Small (gap size between main tracheae 1 and air hose 6 is designed, when the gap between main tracheae 1 and air hose 6 is larger,
The setting number that swirl vane 8 can be increased, when the gap between main tracheae 1 and air hose 6 is smaller, it is possible to reduce eddy flow leaf
The setting number of piece 8) it is configured the increase and decrease of quantity, its object is to: guarantee that combustion-supporting gas is kept most in each eddy flow gap
Good circulation, avoid the occurrence of combustion-supporting gas circulation it is smaller and occur being tempered or combustion-supporting gas circulation it is larger and occur from
The problem of fire.
Limit herein: swirl vane 8 is in setting and adjacent two swirl vanes 8 at equal intervals on the lateral surface of casing 7
Between overlapping, its overlapping angle be 20 °~45 °.
Specifically, the 1.3 of overlapping angle of the end outlet angle of swirl vane 8 between two adjacent swirl vanes
~2 times.
5, hollow cylindrical tube
The inside of main tracheae 1, the inside of the lateral surface of hollow cylindrical tube 9 and main tracheae 1 is arranged in hollow cylindrical tube 9
Interval is arranged and is formed with gas circulation gap between face.It is designed based on this structure, the utility model also carries out nozzle body 4
Adaptability structure optimization: being provided with coaxial interior circulation openings on nozzle body 4, in one end of cylindrical tube 9 is plugged in
In circulation openings, fuel gas injection pipe 5 is communicated with gas circulation gap.
Hollow cylindrical tube 9 is set in main tracheae 1, can guarantee that combustion gas can only circulate in gas circulation gap,
Also, the fuel gas injection pipe 5 being arranged on nozzle body 4 is docked with gas circulation gap, can either improve gas circulation in this way
Smooth degree, while inner cycle channel can also be provided for circulation in occurring in burner hearth (inner cyclic process, combustion product is combustion-supporting
Reflux can be achieved under the action of gas cyclone, the setting of cylindrical tube 9 can provide reflux avoiding space for interior circulation).
6, steady flame device
Steady flame device 10 is integrally formed using refractory material, and steady flame device 10 is whole in the shape of a trumpet, steady flame device 10
Osculum end cap is set on the air outlet slit of air hose 6, and the big opening end of steady flame device 10 is arranged towards burner hearth direction.Steady flame device 10
The structure design for cooperating cyclone, can be improved the eddy flow effect of combustion product, improve flame combustion stability to reach
Purpose.
The utility model additionally provides a kind of gas fired-boiler, includes furnace body 11, and furnace body 11 has a burner hearth, and the one of furnace body 11
Side offers the flame jet port communicated with burner hearth, and the other side of furnace body 11 offers the smoke exhaust pipe 12 for flue gas output,
Burner is installed, combustion product (flue gas) can be discharged from smoke exhaust pipe 12 on flame jet port.
Burner used in gas fired-boiler provided by the utility model be the utility model it is above-mentioned for gas-fired boiler
Kiln gas reflux internal-external double circulation low NO.
It specifically, include main tracheae 1 for gas fired-boiler smoke backflow internal-external double circulation low NO, main tracheae 1
Head end is provided with nozzle assembly, is arranged with air hose 6, main tracheae 1 and air hose in one end that main tracheae 1 is provided with nozzle assembly
Air passing clearances are formed between 6, the head end of main tracheae 1 is docked with flame jet port；Drum for being compressed to gas
Blower 13, air blower 13 include 13 gas outlet of 13 air inlet of air blower and air blower, are connected with 13 gas outlet of air blower
Cigarette wind mixing tube 14, cigarette wind mixing tube 14 are docked with air hose 6 and are connected to air passing clearances；The cigarette being connect with smoke exhaust pipe 12
Gas circulation pipe 15, flue gas recirculation pipe 15 are docked with 13 air inlet of air blower；For conveying the main air hose 16 of fresh air, main air hose
16 dock with 13 air inlet of air blower.
In order to separate the moisture contained in the flue gas to flow back in outer circulation, the utility model is also provided with dehydration
Device 17, dehydration device 17 are docked with 13 air inlet of air blower, and main air hose 16 and flue gas recirculation pipe 15 pass through dehydration device 17
It is connect with air blower 13.By processing flow sequence, dehydration device 17 is set before air blower 13, can be improved backflow flue gas and new
The degree of drying of fresh air gas mixture, thus reduce moisture it is excessive and be easy to cause 13 damage problem of air blower occur it is several
Rate.
In the present invention, in being provided with steady flame device 10, steady flame on the flame jet port of the air outlet slit of air hose 6
Igniter 18 and flame detecting device 19 are provided on device 10.
In the utility model, the air flow of gas fired-boiler is as follows: the output of 11 tail portion of furnace body of outside air and boiler
Part outer circulation flue gas via air blower 13 be pressurized after respectively after main air hose 16 and flue gas recirculation pipe 15 in cigarette wind mixing tube 14
In mixed, air becomes rich in CO2Hot-air, rotating jet quilt is formed after cyclone subsequently into air hose 6
It is ejected into burner hearth.
In the utility model, the fuel process of gas fired-boiler is as follows: entering main tracheae by fuel gas inlet 3 after fuel is pressurized
1, the quilt after right end (open end) entrance of main tracheae 1 has multiple equally distributed fuel gas injection pipes 5 of certain tilt angle
It spurts into burner hearth, then the hot-air with cyclone output is diffused mixed firinor fuel burning.
Optimization is had the following structure on the gas fired-boiler:
Steady flame device 10 is that a horn is flared in the bell mouth shape groove being embedded into the furnace wall of furnace body 11, and is used resistance to
Fiery cement pours, so that mixed airflow (part circulating flue gas mixes with air) forms whirlpool in nozzle periphery, high temperature is caused to fire
It burns product to flow back, achievees the purpose that stable flame.
It is drawn after part circulating flue gas mixes with air from boiler tail, 14 conduct of cigarette wind mixing tube is sent by air blower 13
Combustion-supporting gas, flue gas recirculation rate is up to 30~40%.
In nozzle assembly, 5 structure setting of fuel gas injection pipe being arranged on nozzle body 4 has 20~40 and uniformly divides
Cloth is on nozzle body 4, with 15~40 ° between the center line of the pipe axis and burner (main tracheae 1) of fuel gas injection pipe 5
Angle.Combustion gas is sprayed through each fuel gas injection pipe 5, and fuel gas flow speed is uniform, is in cross jet with air stream.The utility model
Multiple fuel gas injection pipes 5 are provided with, flame can be divided into multiple individual flammules, flammule heat dissipation area is big, fire
Flame peak temperature reduces, and advantageously reduces the production quantity of nitrogen oxides.
Cyclone is installed in air hose 6, cyclone includes casing 7 and swirl vane 8, and swirl vane 8 is provided with
10~20, swirl vane 8 is uniformly distributed on casing 7, and swirl vane 8 is axial arcuation blade construction, 8 phases of swirl vane
Mutually overlapping forms rotating jet so that air stream glances off.Overlapping angle between swirl vane 8 is 20~
45 °, and the angle is best with 30 °.Outside air through cyclone forms rotating jet after mixing with burner hearth outer loop flue gas,
Volume inhales a large amount of surrounding flue gases, and circulation is so that combustion-supporting gas is heated and dilutes before combustion in such flue gas outer circulation and flue gas
To lower oxygen content, the flame temperature and oxygen concentration of combustion zone are thereby reduced, the life of nitrogen oxides is advantageously reduced
Cheng Liang, and flue gas outer circulation rate can reach 20~40%.It is outside that combustion-supporting gas using cyclone forms certain rotation speed
Extension, is mixed strongly with jet-flow in a certain angle, improves efficiency of combustion.In addition, uniformly being divided by 20~40
The fuel gas injection pipe 5 of cloth enhances gas flow rate uniformity, and is provided with the steady flame device of horn flaring structure design
10, so that combustion-sky mixed airflow is formed whirlpool in nozzle periphery so that high-temperature combustion product flows back, the size of recirculating zone with
Regurgitant volume dramatically increases, so that flame holding improves.
In cigarette wind mixing tube 14, air blower 13 installs dehydration device 17, vapor when preventing circulating flue gas temperature too low additional
Condensation, excludes condensed water at any time, in order to avoid influence fan operation.
The utility model technical effect is as follows: using the inside and outside circulation of flue gas, rotating jet, cross jet and horn mouth formula
The multiple technologies such as steady flame device 10, the purpose for realizing low-temperature burning, stablizing burning, improving temperature uniformity in burner hearth are maximum
Limit inhibits the generation and discharge with reduction nitrogen oxides, and flue gas recirculation rate may be up to 20~40%, furnace outlet nitrogen oxides
Concentration is lower than 30mg/m3。
In the present invention, the realization process of low-NO_x combustion technology is as follows: extracting a part of low temperature cigarette in boiler tail
Gas (being lower than 180 DEG C) is sent to the boiler for combustion room after mixing with air, while mixed airflow enters after cyclone by rotary irradiating
The negative pressuren zone volume that flow center is formed inhales a large amount of surrounding flue gases, follows in such flue gas outer circulation and flue gas bad so that combustion-supporting gas is firing
It is heated and is diluted to lower oxygen content before burning, reduces the flame temperature and oxygen concentration of combustion zone in this way, favorably
In the production quantity for reducing nitrogen oxides.Multiple equally distributed fuel gas injection pipes 5 are provided on nozzle assembly, combustion gas is through each combustion
Gas jet pipe 5 sprays, and flame is divided into multiple individual flammules, and flammule heat dissipation area is big, and flame peak temperature reduces,
Advantageously reduce the production quantity of nitrogen oxides；Combustion-supporting gas forms certain rotation speed using cyclone and extends to the outside, and is in
The jet-flow of certain angle is mixed strongly, improves efficiency of combustion.In addition, the structure design of nozzle assembly enables to
The enhancing of gas flow rate uniformity, horn are flared steady flame device 10, so that combustion-sky mixed airflow is formed whirlpool in nozzle periphery, make
It obtains high-temperature combustion product to flow back, the size and regurgitant volume of recirculating zone dramatically increase, so that flame holding improves.
The above is only the preferred embodiments of the utility model, are not intended to limit the utility model, for the skill of this field
For art personnel, various modifications and changes may be made to the present invention.Within the spirit and principle of the utility model, made
Any modification, equivalent substitution, improvement and etc., should be included within the scope of protection of this utility model.
Claims (10)
1. one kind is used for gas fired-boiler smoke backflow internal-external double circulation low NO characterized by comprising
Burner body, the burner body include main tracheae (1), and one end of the main tracheae is provided with block plate (2)
And it is formed with closed end, the other end of the main tracheae is open to be arranged and is formed with open end, is connected on the main tracheae
Fuel gas inlet (3), the fuel gas inlet are arranged close to the closed end；
Nozzle assembly, the nozzle assembly include the nozzle body (4) of tray type structure, are provided with combustion on Yu Suoshu nozzle body
Gas jet pipe (5), the fuel gas injection pipe are straight pipe type structure, one end of the fuel gas injection pipe be injection pipe air inlet, its
The other end is injection pipe gas outlet, and the nozzle body is set on the open end, and the nozzle body is towards the main gas
The one side of pipe is medial surface, and the another side of the nozzle body is lateral surface towards burner hearth, and the injection pipe air inlet is opened
On the medial surface, the injection pipe gas outlet is opened on the lateral surface, and the fuel gas injection pipe is from the injection
Pipe air inlet is directed toward the injection pipe gas outlet, its axis is gradually distance from the center line of the nozzle body, the fuel gas injection
Pipe is provided with multiple, whole fuel gas injection pipe rings and is arranged at equal intervals around the center line of the nozzle body；
Air hose (6), the air hose are sheathed on the outside of the main tracheae, the medial surface of the air hose and the main tracheae
Lateral surface between interval be arranged and be formed with air passing clearances, the air hose is closing close to one end of the closed end
Formula structure, the air hose other end are Open architecture and are formed with air outlet slit；
Cyclone, the cyclone include for covering the casing (7) being set on the open end of the main tracheae, in described sleeve pipe
Lateral surface on be provided with swirl vane (8), the swirl vane is provided with multiple, whole swirl vanes in the set
It is arranged at equal intervals on the lateral surface of pipe, interval is arranged and is formed with eddy flow gap, edge between two adjacent swirl vanes
The axis direction of described sleeve pipe, the eddy flow gap side be the rotational flow inlet communicated with the air passing clearances, it is described
The other side in eddy flow gap is the eddy flow outlet being arranged towards burner hearth, and the eddy flow gap is directed toward its eddy flow from its rotational flow inlet and is gone out
Mouth is, around the spiral line type channel design of described sleeve pipe, the cyclone is set in the air passing clearances, the rotation
The medial surface for flowing the lateral surface and the air hose of device offsets.
2. according to claim 1 be used for gas fired-boiler smoke backflow internal-external double circulation low NO, which is characterized in that
The master is intratracheally provided with hollow cylindrical tube (9), the medial surface of the lateral surface of the cylindrical tube and the main tracheae
Between interval be arranged and be formed with gas circulation gap；
Coaxial interior circulation openings are provided on the nozzle body, one end of the cylindrical tube is plugged in the interior circulation
In opening, the fuel gas injection pipe is communicated with the gas circulation gap.
3. according to claim 1 be used for gas fired-boiler smoke backflow internal-external double circulation low NO, which is characterized in that
The fuel gas injection pipe is provided with 20 to 40, the center line of the pipe axis and the nozzle body of the fuel gas injection pipe
Between be in 15 °~40 ° of angle.
4. according to claim 1 be used for gas fired-boiler smoke backflow internal-external double circulation low NO, which is characterized in that
The swirl vane is axial arcuation blade, and the swirl vane is provided with 10 to 20.
5. according to claim 4 be used for gas fired-boiler smoke backflow internal-external double circulation low NO, which is characterized in that
The swirl vane is on the lateral surface of described sleeve pipe at equal intervals between setting and adjacent two swirl vanes
Overlapping, its overlapping angle are 20 °~45 °.
6. according to claim 4 be used for gas fired-boiler smoke backflow internal-external double circulation low NO, which is characterized in that
The 1.3~2 of overlapping angle of the end outlet angle of the swirl vane between two adjacent swirl vanes
Times.
7. according to any one of claims 1 to 6 be used for gas fired-boiler smoke backflow internal-external double circulation low NO,
It is characterized in that,
It further include having steady flame device (10), the steady flame device is bell-mouth structure of air, and the osculum end cap of the steady flame device is set to
On the air outlet slit of the air hose, the big opening end of the steady flame device is arranged towards burner hearth direction.
Include furnace body (11) 8. a kind of gas fired-boiler, the furnace body has a burner hearth, the side of the furnace body offer with it is described
The flame jet port that burner hearth communicates, the other side of the furnace body offer the smoke exhaust pipe (12) for flue gas output, and feature exists
In, further includes:
It is as described in any one of claim 1 to 7 to be used for gas fired-boiler smoke backflow internal-external double circulation low NO, the use
It include main tracheae in gas fired-boiler smoke backflow internal-external double circulation low NO, the head end of the main tracheae is provided with nozzle
Component, one end that the main tracheae is provided with the nozzle assembly are arranged with air hose, the main tracheae and the air hose it
Between be formed with air passing clearances, the head end of the main tracheae is docked with the flame jet port；
Air blower (13) for being compressed to gas, the air blower include fan inlet and air blower outlet
Mouthful, be connected with cigarette wind mixing tube (14) with the air blower gas outlet, the cigarette wind mixing tube docked with the air hose and with
The air passing clearances connection；
It is connected with flue gas recirculation pipe (15) with the smoke exhaust pipe, the flue gas recirculation pipe is docked with the fan inlet；
For conveying the main air hose (16) of fresh air, the main air hose is docked with the fan inlet.
9. gas fired-boiler according to claim 8, which is characterized in that
It further include having dehydration device (17), the dehydration device is docked with the fan inlet, the main air hose and institute
It states flue gas recirculation pipe and is connect by the dehydration device with the air blower.
10. gas fired-boiler according to claim 8 or claim 9, which is characterized in that
Steady flame device is provided on the air outlet slit of the air hose, be provided on the steady flame device igniter (18) and
Flame detecting device (19)；
The steady flame device is assemblied on the flame jet port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821934006.6U CN208859604U (en) | 2018-11-22 | 2018-11-22 | For gas fired-boiler smoke backflow internal-external double circulation low NO and gas fired-boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821934006.6U CN208859604U (en) | 2018-11-22 | 2018-11-22 | For gas fired-boiler smoke backflow internal-external double circulation low NO and gas fired-boiler |
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| CN208859604U true CN208859604U (en) | 2019-05-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109340747A (en) * | 2018-11-22 | 2019-02-15 | 北京基鼎环保科技有限公司 | For gas fired-boiler smoke backflow internal-external double circulation low NO and gas fired-boiler |
| CN114151790A (en) * | 2021-12-01 | 2022-03-08 | 北京航天石化技术装备工程有限公司 | Distributed flue gas internal and external dual-cycle coupling staged combustion equipment |
-
2018
- 2018-11-22 CN CN201821934006.6U patent/CN208859604U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109340747A (en) * | 2018-11-22 | 2019-02-15 | 北京基鼎环保科技有限公司 | For gas fired-boiler smoke backflow internal-external double circulation low NO and gas fired-boiler |
| CN114151790A (en) * | 2021-12-01 | 2022-03-08 | 北京航天石化技术装备工程有限公司 | Distributed flue gas internal and external dual-cycle coupling staged combustion equipment |
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