CN208282109U - A kind of combustion head - Google Patents
A kind of combustion head Download PDFInfo
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- CN208282109U CN208282109U CN201820666496.XU CN201820666496U CN208282109U CN 208282109 U CN208282109 U CN 208282109U CN 201820666496 U CN201820666496 U CN 201820666496U CN 208282109 U CN208282109 U CN 208282109U
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- combustion
- gas
- air
- annular housing
- flame
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Abstract
The utility model discloses a kind of combustion heads, it includes the annular housing that outer wall cylinder, the inner edge of inner wall cylinder and face closed at both ends and outer rim are formed, the outer wall cylinder and inner wall cylinder and burner flame cylinder are coaxial, combustion gas injects annular housing by least one second gas burning connecting tube, combustion gas dispensing orifice is distributed on the outer wall cylinder and inner wall cylinder, combustion gas flows out annular housing by the combustion gas dispensing orifice, is equipped with gas nozzle on the combustion gas dispensing orifice.The annular housing combustion head of the utility model can separate combustion air, form two different mixing ratio air-flows, air-flow at center can ensure to generate a stable flame (flame of centre), the Secondary Air air-flow of layering also can guarantee well the fractional combustion of secondary flame, to reach the generation for substantially reducing NOx.
Description
Technical field
The utility model belongs to burner and its relevant air-gas mixing arrangement technical field, in particular to a kind of
Combustion head and burner.The utility model relates to associated industrial burner, type covers the combustion including being mounted on combustion chamber
Head is burnt, fuel is natural gas, can be used for the system with or without external flue gas recirculation.
Background technique
For the burner of combusts fossil class A fuel A, tail gas can generate environmentally harmful pollutant, especially nitrogen and
Generation (such as NO, NO of the compound of oxygen2), normally referred to as nitrogen oxide NOx.It can be taken in designed combustion device a variety of
Measure, enable the generation of pollutant be affected/or reduce, especially this when used in burner.
For the burner of heat energy system, the nitrogen oxides for generation of burning reaches a certain critical-temperature in ignition temperature
When, production quantity directly increases with flame temperature exponentially grade.For above type of known burner, the solution of recommendation
It is all to make an issue of how reducing in flame temperature.
In general, the generation for reducing or reducing NOx is always the target ideal of industrial burner.It uses in the past
Some effective drop nitrogen methods are mainly Lean burn combustion (or thin combustion using fuel/air mixture composition main burning
It burns, is primarily referred to as the content of fuel gas in the mixture lower than air-fuel ratio gas quantity needed for normal completely burned, fuel phase
It is referred to as Lean burn combustion to poor), then the secondary combustion for cooperating another part fuel gas to be classified.Main Lean burn combustion mode is one
It can achieve satisfied effect on a little devices, because excessive air provides the negative of reduction flame temperature in Lean burn combustion
It carries, then also just reduces nitrogen oxides.The combustion gas of classification is mixed into combustion zone later by burner edge gas nozzle or passes through
The center gas nozzle stretched out outside gas nozzle outlet enters combustion zone.The fuel of secondary combustion and the excess air of Lean burn combustion be
Have and burn in the environment of some flue gases, reaches the reaction effect that combustion mixture has been diluted.But these arrangements are simultaneously
Nitrogen oxides successfully always can not be reduced to ideal value.
For example, main lean combustion fuel mixing needs that a large amount of excess air is added in combustion zone, so air velocity is with respect to meeting
It is very fast.So high flow velocity is more than flame velocity sometimes, generates unstable combustion flame environment, and flame is unstable
Fixed, burning cannot even continue.
It is recorded in the patent document of 3811477 A1 of Patent No. DE, for gas burner, combustion gas is mixed with air
At entry of combustion chamber, combustion gas is entered by some mixing tubes.Wherein combustion gas is directly sent into combustion via mixture pipe and its nozzle
Chamber inlet is burnt, is mixed into combustion chamber with combustion air.Fuel gas conduit outlet is in burner mixing chamber according to diverging directional spreding
In different sections.
The statement of DE 195 09 219 is the combustion head of a kind of mode and its burner, while about fuel gas burning
Combustion air is supplied, nitrogen oxides is reduced using band non-active gas, after wherein fuel gas divides two-stage, level-one to be superimposed upon another grade
Face is blown on the flow direction of combustion air by the root of flame, and first order metachemistry reacts the combustion air and fuel of ratio
The mixed gas of gas flows to flame, and the fuel gas of supplement is added in second level section, and the flue gas where looped back is as non-
Active gases is added to the second level, and a part of burning gases injection second level and circulating flue gas are formed lower than chemical reaction ratio
Mixed gas is mixed before reaching flame.
The record of EP 0 347 834 be a kind of forced-air blast gas burner combustion head, have a burner tube
Distributor comprising fuel gas and combustion air and relevant fuel gas jets and air duct, burner tube and flame
Pipe is connected, and has the circulating flue gas mouth of radial aperture in the position that burner tube is connect with flame tube, circulating flue gas is by these radiation
Formula opening is reverse to flow into flame root, while fuel gas and air flow into flame by nozzle and air duct forward direction, and combustion gas exists
Longitudinal axis directional divergence formula protrudes into flame region inside combustion head.
The record of EP 0 635 676 be a kind of method liquid fuel within or gaseous fuel low NOx combustion dress
It sets, burner used is extend into the combustion chamber of boiler, at least one fuel nozzle is for supplying in its burner flame cylinder
Fuel and neighbouring stable flame pan are answered, a large amount of combustion gas is sent to the inner wall area of burner inner liner by this method outward by stable flame pan, in fire
The quick flow that flame cylinder and stable flame pan gap are flowed through can generate negative pressure in the edge of burner inner liner, the flue gas of generation in combustion chamber and
It is recycled by inside, has been sent to the negative pressuren zone, has there is multiple water conservancy diversion wedge angles for being deep into negative pressuren zone on burner inner liner.
Chinese patent CN107120652 describes a kind of classification combustion gas low NO, is related to technical field of burner.Point
Grade combustion gas low NO includes distributor, flow guiding disc, ignitor, igniter fuel pipe and burning cylinder.Distributor is for giving
Combustion gas and air provide flow path, including ontology, multiple exhaust gas nozzles, combustion gas distribution ring and multiple air distributions.Ontology
For the cylinder with the first interlayer, combustion gas is entered after fuel gas conduit by ontology to be sprayed by combustion gas distribution ring.Air flows through ontology
Inlet air flow path is formed on the outside of hollow portion, air distribution and distributor, provides combustion-supporting gas to combustion gas.CN107120652
Distribution ring thinner thickness, as shown in the figure 4 times of diameters for being not more than combustion gas dispensing orifice, only using combustion gas as Internal and external cycle distribution,
There is no the functions of separating air.The air that the flow guiding disc of CN107120652 imports multiple air distributions is led
Stream forms rotary air air-flow, and main body is air, not set gas distribution device.
Above-mentioned patent makes combustion gas be divided into two-stage ejection after combustion gas distribution ring, provides enough skies to flame of centre
Gas enhances air and combustion gas mixing, shortens flue gas in the residence time of high-temperature region, advantageously reduces flame temperature.It is above-mentioned special
Benefit can control the flow and speed of air and combustion gas, control air-fuel ratio, and combustion gas is made to mix well with air burning, reduce nitrogen oxidation
The generation of object.
But these above-mentioned known patented methods and structure are increasingly increased dirty for combustion apparatus reduction to realize
Dye object discharge demand be it is inadequate, especially when statutory requirements reach the discharge index of low NOx, these sides
Method and structure are limited, and still there is a problem of that nitrogen oxides is excessively high.
The purpose of the utility model is to overcome the drawbacks described above of existing combustion head, the combustion head of the utility model by using
The method of salary distribution of the innovation of one annular cavity highly precisely distributes combustion gas in the position close to flame region, simultaneously
Combustion head is flowed out after combustion air is divided into First air and Secondary Air.First air and Secondary Air can be separated completely, together
When accurately control the air an of air-flow and secondary gas flow and the mixing ratio of combustion gas.Air fuel gas is mixed by means of this
Be precisely controlled, it is possible to produce the secondary gas flow (poor fuel area) and air capacity that air capacity is more than chemical reaction ratio are lower than chemical
React an air-flow (fuel-rich regions) of ratio.Increasing an air-flow gas concentration and reducing secondary gas flow gas concentration can bring up
Formation of nitrogen oxides is reduced.
Utility model content
The purpose of this utility model is to provide air and the combustion gas that can accurately control an air-flow and secondary gas flow
Mixing, reaches the combustion head and burner for substantially reducing formation of nitrogen oxides.
The technical solution of the utility model is a kind of combustion head comprising outer wall cylinder, inner wall cylinder and face closed at both ends it is interior
The annular housing that edge and outer rim are formed, the outer wall cylinder and inner wall cylinder and burner flame cylinder are coaxial, and combustion gas passes through at least one
A second gas burning connecting tube injects annular housing, combustion gas dispensing orifice is distributed on the outer wall cylinder and inner wall cylinder, combustion gas passes through
The combustion gas dispensing orifice flows out the annular housing, is equipped with gas nozzle on the combustion gas dispensing orifice.
Preferably, the annular housing has certain length to generate the primary of separation on the axial direction of combustion head
Wind channel and secondary air channel form the swirling eddy of First air in the First air channel air air-flow, in the Secondary Air
The straight air-flow of channel formation Secondary Air.
Preferably, the length of the annular housing is more than or equal to the 20% of burner flame cylinder diameter.
Preferably, air conducting component is integrated on the gas nozzle, the gas nozzle is according to required combustion gas point
Installation fixation is carried out with direction.
Preferably, combustion gas is assigned to flame zone by the exit region of annular housing.
Preferably, the gas nozzle is connect with the silk pitch thread of the combustion gas dispensing orifice, by adjusting the gas injection
The screw-in depth of mouth, adjustment of combustion gas flow, the gas nozzle can be closed by being screwed into bottom completely.
Preferably, it along the axis direction of the combustion head, the longitudinal length of extension, is arranged on front side of stable flame pan with rear side
There is gas nozzle.
Preferably, the input end of the second gas burning connecting tube connects with the outlet end of gas distribution pipe by the way that piston type is nested
It connects, is capable of the axial position of elastic adjusting combustion head, while the taper of the burner flame cylinder inner wall front end being cooperated to receive
Gap between mouthful adjusts the flow of Secondary Air.
It preferably, further include cylindrical chamber and stable flame pan, the tapered closing in shape in the outlet of the burner flame cylinder, institute
The clearance space for stating the taper mouth of annular housing and the burner flame cylinder forms Secondary Air larynx neck, the cylinder chamber
Body provides the installation to the stable flame pan and supports, and the cylindrical chamber can be on a gas distribution pipe along the axis of combustion head
The elastic sliding in line direction, to adjust the relative position with annular housing.
In conclusion the utility model has the beneficial effects that: the annular housing combustion head of the utility model can will help
Combustion wind separates, and forms two different mixing ratio air-flows, an air-flow of rotation can ensure to generate a stable flame
(flame of centre), the light breeze air-flow of layering can also guarantee the fractional combustion of secondary flame well, substantially reduce to reach
The generation of NOx.
The utility model is described in more detail below by embodiment.
Detailed description of the invention
The combustion head that Fig. 1 show the utility model is placed in the schematic diagram of combustion chamber for burner.
Fig. 2 show the transverse sectional view of the combustion head of the utility model and along figure the direction A-A cross-sectional view.
Fig. 3 is the transverse sectional view of the combustion head of the utility model and the cross-sectional view in the direction A-A in figure.
The structural schematic diagram of Fig. 4 the utility model combustion head.
The structural schematic diagram of air conducting piece is installed on the outer tube wall of Fig. 5 the utility model combustion head.
The structural schematic diagram of Fig. 6 the utility model combustion head.
The structure sectional view of Fig. 7 the utility model combustion head.
The appended drawing reference of the utility model refers to as follows: 1, combustion head, 2, main air inlet pipe, 3, gas distribution pipes, 4,
Secondary gas distribution pipe, 5, annular housing-combustion gas collector, 6, gas nozzle, 7, stable flame pan, 8, burner inner liner, 9, inner wall cylinder,
10, outer wall cylinder, 11, inner edge, 12, outer rim, 13, combustion gas collector-cylindrical chambers, 14, First air channel, 15, Secondary Air
Channel, 16, Secondary Air larynx neck, 17, flame generation areas (small dotted line race way), 18, (big dotted line follows secondary flame generation area
Ring region), 19, main combustion gas stream, 20, combustion gas streams, 21, secondary combustion gas stream, 22, combustion head axis, 23, combustion gas dispensing orifice, 24,
Second gas burning connecting tube, 25, boiler, 26, combustion chamber, 27, air conducting piece, 28, burner inner liner conical outlet, the outlet of 29 combustion heads
Region (long dotted line).
Specific embodiment
The utility model is further described in a manner of embodiment combination attached drawing below.
As shown in Figures 1 to 7, it illustrates the specific structure of the utility model combustion head, the combustion heads 1 of the utility model
Devise annular housing combustion gas collector 5 come guiding gas flow into combustion head generate kindling region, the combustion head include by
The annular housing that the inner edge 11 of outer wall cylinder 10, inner wall cylinder 9 and face closed at both ends and outer rim 12 are formed, outer wall cylinder 10, inner wall cylinder 9 with
Burner flame cylinder 8 is coaxial, and on the central axial extended line of combustion chamber 26, which has sufficient length to ensure
It can arrange enough gas nozzles 6, the flame zone 17 and 18 for being assigned to burner that gas quantitative ladder is classified simultaneously will
Combustion air is divided into First air and Secondary Air.
The combustion head (i.e. combustion gas collector 5) of the annular housing of the utility model has the function of dual function: first is
Many gas nozzles 6 are integrated on combustion gas dispensing orifice 23 on the outer wall cylinder 10 and inner wall cylinder 9 of annular housing 5, these nozzles 6 can
The interior of the annular housing 5 of air current flow direction can also be distributed in the length direction of annular housing 5 and diametrical direction distribution
On the surface of edge 11 and outer rim 12.With the use of different latus rectums and the nozzle of quantity 6, may be implemented for combustion gas by required stream
Size and injection direction are measured, accurately combustion gas is assigned in flame region 17 and 18.
Combustion-supporting air is divided into two parts, combustion air by second function of the combustion head of the annular housing of the utility model
Via the First air channel 14 that the inner wall 9 of annular housing 5 is established, air-flow forms First air when flowing out by First air channel 14,
And Secondary Air is that combustion air forms two when flowing out via the secondary air channel 15 that the outer wall 10 and burner inner liner 8 of annular housing 5 are formed
Secondary wind.Combustion gas is assigned to flame zone in the exit region 29 of combustion head 1 by it, for heating to boiler 25.
The ratio of First air and Secondary Air can be controlled by designing, by selecting the outer wall cylinder 10 of annular housing and interior
The seemly diameter size of wall cylinder 9 is realized.The ratio of First air and Secondary Air can also control by other means, relative to ring
The position of shape cavity 5 reduces the diameter of stable flame pan 7, can increase the flow of First air, the outer wall of burner inner liner 8 and annular housing 5
10 gap sizes determine be Secondary Air actual internal area, we are referred to as larynx neck 16, its size controls the wind of Secondary Air
Measure size.
Multiple gas nozzles 6 are mounted on the inside and outside wall 9 and 10 of annular housing 5 and the surface of outer rim 12, and nozzle 6 can be with
Select different latus rectum sizes, number and shape, to obtain the ideal combustion gas distribution in flame area 17 and 18.
Multiple air conducting components 27 can be the fin of metal material, be mounted on the inner wall or outer wall of annular housing 5,
For guiding air draught, the intensity of enhancing air swirling eddy can contract short flamed length, can also be used to adjust primary
The proportion of wind and Secondary Air.
Gas nozzle 6 and air conducting piece 27 are designed as being threadedly coupled with annular housing 5, can easily be screwed into.Pass through tune
The screw-in depth of whole nozzle 6, adjustment of combustion gas flow, the nozzle can be closed by being screwed into bottom completely.
Annular housing 5 can integrated installation a lot of other components meet additional function, can by the bracket being designed correctly
To install ignitor and flame detecting electrode, realizes igniting and functions of flame detection, some external components can be installed and come school
It is quasi- its in the center of burner inner liner 8, or installation Universal caster, easily sliding is dilatory when facilitating installation and maintenance.
Main combustion gas stream 19 and total fuel gas flow amount are flowed through in main air inlet pipe 2.Combustion gas collector passes through secondary combustion gas point
Piping 4 and 24 is connected to receive combustion gas injection with main air inlet pipe 2, and the quantity of secondary gas distribution pipe 4 and 24 can be one more than,
It can be more.Extended outward by the radiation of main air inlet pipe 2 diverging, then secondary gas distribution pipe 4 is parallel with combustion head axial 22.
Main combustion gas 19 is via forming secondary combustion gas stream 21 in secondary gas distribution pipe 4, while via forming one in a gas distribution pipe 3
Secondary combustion gas stream 20.Secondary gas distribution pipe 4 is coaxially nested using piston type with secondary gas connection pipe 24, guarantees combustion gas collector
5 can be to front or rear sliding axial the 22 of combustion head, it is therefore an objective to which ensuring can be by adjusting toroidal cavity 5 relative to burner inner liner
The position of conical outlet 28 and stable flame pan 7 changes the distribution of air draught.Gas distribution pipe 3 of the utility model refers to
Center gas distribution pipe, secondary gas distribution pipe 4 and 24 refer to the gas distribution pipe for annular housing 5.
Because annular housing 5 only contains the combustion gas distribution of the outer collar region of combustion head, the utility model is also used cooperatively
Combustion gas distribution system guiding gas is reached the kindling section of a flame generation area 17 by the outlet of main air inlet pipe 2.One
Secondary flame generation area 17 establishes the environment of a high swirling eddy of relatively low pressure on front side of stable flame pan 7, in the axis of combustion head
Flame (flame of centre) of upper formation.One time combustion gas distribution system can be made of multiple exhaust gas nozzles, and the utility model uses
Combustion gas collector-cylindrical chamber 13, it provides the support and installation site to stable flame pan 7 simultaneously, includes primary combustion
Gas jets 6.One time combustion gas collector-cylindrical chamber 13 can be on a gas distribution pipe 3 along 22 side of axis of combustion head
Telescopic slide forwards, backwards, to adjust and the relative position of annular housing-combustion head 5.
Burner 1 includes a burner inner liner 8, and the outer end opening of burner inner liner 8 is located at the interface of combustion chamber 26.Burner inner liner 8
Outlet can do tapered closing in shape, the clearance space shape of the taper mouth 28 of annular housing burner 5 and burner inner liner 8
At Secondary Air larynx neck 16, this is used to adjust the flow of Secondary Air.On combustion head axis 22, adjusting annular housing is slid in and out
5 can reduce Secondary Air larynx neck ventilation-sectional area to reduce secondary air flow.
Because of the combustion head 1 of 5 structure of annular housing, First air and Secondary Air can be separated completely, while essence
The air of quasi- air-flow of control and secondary gas flow and the mixing ratio of combustion gas.By means of this essence for air fuel gas mixing
Quasi- control, it is possible to produce the secondary gas flow (poor fuel area) and air capacity that air capacity is more than chemical reaction ratio are lower than chemical reaction
Air-flow (fuel-rich regions) of ratio.Nitrogen oxygen can be brought up by increasing an air-flow gas concentration and reducing secondary gas flow gas concentration
The identical materialization mechanism (Lean burn combustion and fuel-rich burning) that compound production quantity is reduced.
The combustion head 5 of introducing and employment annular housing structure can separate combustion air, form two different mixing ratios
Air-flow, an air-flow of rotation can ensure to generate a stable flame generation area 17(flame of centre), the light breeze of layering
Air-flow can also guarantee the fractional combustion of secondary flame generation area 18 well, to reach the generation for reducing NOx.
The structure that the combustion head of the utility model is not limited to the above embodiments can carry out a variety of modifications.In short, not taking off
It is both fallen in the scope of the utility model from all improvement within the scope of the spirit of the present invention.
Claims (9)
1. a kind of combustion head, which is characterized in that inner edge (11) including outer wall cylinder (10), inner wall cylinder (9) and face closed at both ends and
The annular housing that outer rim (12) is formed, the outer wall cylinder (10) and inner wall cylinder (9) and burner flame cylinder (8) are coaxial, combustion gas
Annular housing is injected by least one second gas burning connecting tube (24), is distributed on the outer wall cylinder (10) and inner wall cylinder (9)
Have combustion gas dispensing orifice (23), combustion gas flows out the annular housing, the combustion gas dispensing orifice by the combustion gas dispensing orifice (23)
(23) gas nozzle (6) are installed on.
2. combustion head according to claim 1, which is characterized in that the annular housing has on the axial direction of combustion head
There is certain length to generate the First air channel (14) of separation and secondary air channel (15), in First air channel (14) sky
Gas air-flow forms First air air-flow, forms Secondary Air air-flow in the secondary air channel (15).
3. combustion head according to claim 2, which is characterized in that the length of the annular housing is more than or equal to burning
The 20% of device burner inner liner (8) diameter.
4. combustion head according to claim 1, which is characterized in that be integrated with air conducting portion on the gas nozzle (6)
Part (27), the gas nozzle (6) carry out installation fixation according to required combustion gas distribution direction.
5. combustion head according to claim 1, which is characterized in that combustion gas is assigned to by the exit region of annular housing
Flame zone.
6. combustion head according to claim 4, which is characterized in that the gas nozzle (6) and the combustion gas dispensing orifice
(23) silk pitch thread connection, by adjusting the screw-in depth of the gas nozzle (6), adjustment of combustion gas flow is screwed into bottom completely
The gas nozzle (6) can be closed.
7. combustion head according to claim 1, which is characterized in that along axis (22) direction of the combustion head, extension
On longitudinal length, on front side of stable flame pan and rear side is disposed with gas nozzle (6).
8. combustion head according to claim 1, which is characterized in that the input end of the second gas burning connecting tube (24) and combustion
It is capable of the axial position of elastic adjusting combustion head by piston type nested encryptions, matches simultaneously in the outlet end of gas distribution pipe (4)
The gap between the taper closing in (28) of burner flame cylinder (8) the inner wall front end is closed to adjust the flow of Secondary Air.
9. combustion head according to claim 1, which is characterized in that it further include cylindrical chamber (13) and stable flame pan (7), it is described
The tapered closing in shape in the outlet of burner flame cylinder (8), the cone of the annular housing (5) and the burner flame cylinder (8)
The clearance space of shape closing in (28) part forms Secondary Air larynx neck (16), and the cylindrical chamber (13) is provided to the stable flame pan
(7) installation support, the cylindrical chamber (13) can be on a gas distribution pipes (3) along axis (22) side of combustion head
Telescopic slide forwards, backwards, to adjust and the relative position of annular housing (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820666496.XU CN208282109U (en) | 2018-05-07 | 2018-05-07 | A kind of combustion head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820666496.XU CN208282109U (en) | 2018-05-07 | 2018-05-07 | A kind of combustion head |
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| Publication Number | Publication Date |
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| CN208282109U true CN208282109U (en) | 2018-12-25 |
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ID=64728958
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| CN201820666496.XU Active CN208282109U (en) | 2018-05-07 | 2018-05-07 | A kind of combustion head |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108397772A (en) * | 2018-05-07 | 2018-08-14 | 上海全颉环境设备有限公司 | A kind of combustion head |
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2018
- 2018-05-07 CN CN201820666496.XU patent/CN208282109U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108397772A (en) * | 2018-05-07 | 2018-08-14 | 上海全颉环境设备有限公司 | A kind of combustion head |
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