CN208846420U - A kind of super low NO of microchannel distribution - Google Patents
A kind of super low NO of microchannel distribution Download PDFInfo
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- CN208846420U CN208846420U CN201821405108.9U CN201821405108U CN208846420U CN 208846420 U CN208846420 U CN 208846420U CN 201821405108 U CN201821405108 U CN 201821405108U CN 208846420 U CN208846420 U CN 208846420U
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- combustion
- fuel
- microchannel
- supporting air
- super low
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Abstract
The utility model provides a kind of super low NO of microchannel distribution, belongs to technical field of combustion equipment.It include: burner body and burner head, burner body is equipped with fuel gas pipeline and combustion-supporting air pipe line, and the burner head includes main fuel pipe and the sleeve that is set in outside main fuel pipe；The main fuel pipe is connected to fuel gas pipeline, and the sleeve is connected to combustion-supporting air pipe line；The main fuel pipe axially arranges multiple rows of primary fuel hole, the sleeve is disposed with combustion-supporting air holes corresponding with primary fuel hole described in each, each primary fuel hole is configured with injection equipment, the injection equipment protrudes into the combustion-supporting air holes, so that fuel and combustion air mix in the combustion-supporting air holes, to form multiply distribution flame at the combustion-supporting air holes.The super low NO of the utility model can solve existing low NO and be unable to reach ultralow NOx (≤15mg/m3(@3.5%O2)) discharge, burner fuel supply system is to the problem of the adaptability difference of lower gaseous-pressure.
Description
Technical field
The utility model relates to technical field of combustion equipment, are distributed super low NO more particularly to a kind of microchannel.
Background technique
The low nitrogen technology of gas burner current main-stream is broadly divided into three classes, is full premix surface combustion technology, flue gas respectively
Circulating technology (FIR) in outside circulation (FGR) and flue gas.For NOx kinetics angle, the low nitrogen skill of these three types of mainstreams
Art is mainly improved from reduction ignition temperature, the burning of deviation stoichiometric ratio, reduction combustion air oxygen content etc..
Full premix surface combustion technology, is adequately to be pre-mixed combustion gas and air before entering into the combustion chamber, makes
It burns more abundant, improve efficiency of combustion and reduces noxious gas emission, while the space requirement of combustion chamber can also be reduced, be current
More advanced a kind of fuel gas buring technology in the world.The technology is the new combustion skill that eighties of last century the eighties just start research and development
Art has a wide range of applications.
Flue gas recirculating technique is sent into furnace after mixing with air part low-temperature flue gas, because flue gas absorbs heat and dilute oxygen
Concentration, so that burning velocity and in-furnace temperature reduce, thus thermal NO x is reduced.The definition of recirculation rate: r=recycling
Flue gas volume/(flue gas volume+combustion air volume of recycling) flue gas recirculation effect is not only related with fuel type,
It is also related with the exhaust gas volumn of recycling.Flue gas recycled amount is generally indicated with flue gas recirculation rate r.Recirculation rate is excessive, furnace temperature
Reduce too many, combustion instability.Recirculation rate is too small, and the effect for reducing NOx is not achieved.Therefore, flue gas recirculation rate generally limits
System is in 10%-20%.
Circulating technology is in combustion, high-temperature flue gas to be inhaled by the high-speed jet volume of combustion gas, in burner hearth in flue gas
Portion forms smoke backflow, increases the mass flow of medium temperature heat absorption working medium in high-temp combustion region, the oxygen for reducing combustion zone is dense
Degree, is diluted flame root or localized high temperature regions, to reduce flame temperature, reaches the mesh for reducing amount of nitrogen oxides
's.
Low-NO_x combustion technology in the prior art is primarily present following problems: blockage problem, combustion instability problem, nitrogen oxygen
Compound discharge instability problem is also easy to produce condensation water problems, combustion gas boosting problem, noise problem, reduces boiler efficiency and power output
The problem of etc..It is significant how disadvantage that in the prior art low-NO_x combustion technology existing is solved.
Utility model content
One purpose of the utility model is to provide a kind of super low NO of microchannel distribution, can solve existing low
Nitrogen burner is unable to reach ultralow NOx (≤15mg/m3(@3.5%O2)) discharge the problem of.
The utility model further object is to provide a kind of super low NO of microchannel distribution, can solve combustion
Problem of the burner fuel system to the adaptability difference of lower gaseous-pressure.
Particularly, the utility model provides a kind of microchannel distribution super low NO, comprising: burner body and burning
Device head, the burner body are equipped with fuel gas pipeline and combustion-supporting air pipe line, and the burner head includes main fuel pipe and set
The sleeve being located at outside the main fuel pipe；The main fuel pipe is connected to fuel gas pipeline, and the sleeve is connected to combustion-supporting air pipe line；
The main fuel pipe axially arranges multiple rows of primary fuel hole, and the sleeve is disposed with and primary fuel described in each
The corresponding combustion-supporting air holes in hole, each described primary fuel hole are configured with injection equipment, and the injection equipment protrudes into described combustion-supporting
Air holes, so that fuel and combustion air mix in the combustion-supporting air holes, to form the distributed fire of multiply at the combustion-supporting air holes
Flame.
Optionally, the end of the main fuel pipe is provided with secondary fuel hole.
Optionally, the end of the main fuel pipe is provided with the flow guiding disc for guiding combustion-supporting wind circulation, so that combustion air
Flame on duty is mixed to form by flow guiding disc and fuel.
Optionally, the diameter that the main fuel pipe at secondary fuel hole is arranged is less than the main fuel pipe being arranged at primary fuel hole
Diameter.
Optionally, the injection equipment is the hollow fuel rod for being mounted on the primary fuel hole.
Optionally, a primary fuel hole, fuel rod and corresponding combustion-supporting air holes form a microchannel, described
Microchannel is arranged with radial direction.
Optionally, the quantity of the microchannel is multiple, and the microchannel is uniformly distributed.
Optionally, the combustion-supporting air holes protrudes the outer surface of the sleeve.
A kind of microchannel provided by the utility model is distributed super low NO, by the way that in burner head, axially arrangement is more
Microchannel is arranged, each microchannel configures fuel injection mechanism, exports to form multi beam distribution flame in microchannel.And main fuel pipe
End be provided with flow guiding disc, to form rotational flow air and flame on duty, to enhance flame holding.
A kind of microchannel provided by the utility model is distributed super low NO, can by adjusting microchannel parameter with
The variation for adjusting the load of burner simplifies the design efforts would of subsequent combustion device seriation development.
Detailed description of the invention
Some specific realities of the utility model are described in detail by way of example and not limitation with reference to the accompanying drawings hereinafter
Apply example.Identical appended drawing reference denotes same or similar part or part in attached drawing.It should be appreciated by those skilled in the art that
The drawings are not necessarily drawn to scale.In attached drawing:
Fig. 1 is the structural schematic diagram that super low NO is distributed according to the microchannel of the utility model one embodiment；
Fig. 2 is the knot that the burner head of super low NO is distributed according to the microchannel of the utility model one embodiment
Structure schematic diagram；
Fig. 3 is the burner head that super low NO is distributed according to the microchannel of the utility model another embodiment
Structural schematic diagram.
Specific embodiment
To keep the purpose of this utility model, technical solution and advantage clearer, below in conjunction with specific embodiment, and join
According to attached drawing, the utility model is described in detail.
The utility model people of the utility model has found when studying low-NO_x combustion technology in the prior art:
The reason of blockage problem in low-NO_x combustion technology are as follows: 1) air filter screen blocks；Air filter screen blocking refers to complete
The phenomenon that fresh air air inlet screen of premix surface type burner is blocked by dust in air can make after air filter screen blocking occurs
Phenomena such as declining at burner combustion load, can not providing enough heats, will lead to tempering, detonation when serious generation, causes
Safety accident.The reason of causing air filter screen to block is the air filter of special designing, which is compiled using multilayer
Superfine metal filtering material and special surface the coating production knitted, need filtering requirement required for meeting burner, but due to
Filter device aperture is too small, and when continuous operation is easy to happen blocking.The blocking period of full premix surface type burner air filter screen
Generally 3~5 days, therefore, it is necessary to buy multiple air filter screen spare parts when project is transformed, increase equipment purchase cost and later period
Operation expense.2) metal surface web blocks；Web blocking in metal surface refers to premixing surface type burner entirely
The phenomenon that metal web protruded into inside burner hearth is blocked by natural gas or dust in air can make after metal web blocking
It is unstable at burner combustion, there is web surface localized hyperthermia, the decline of burner load will lead to metallic fiber when serious
Net is burnt, and causes detonation or other safety accidents.
The reason of combustion instability problem in low-NO_x combustion technology are as follows: combustion instability problem is using current different skills
There is generation in the low NO of art, ignition difficulties can be divided into, turn many aspects such as fiery process is flame-out, flare up fire is lost.
Combustion instability will cause burner load fluctuation, and NOx emission is not up to standard, will affect resident's heating when serious or industrial enterprise uses
Gas.
The reason of causing combustion instability problem has the following aspects: there are a degree of for current low nitrogen technology itself
Technological deficiency, can not adapt to gaseous-pressure to a certain extent, flowed fluctuation, or can not quick response burning load variation；
Ignitor discharge position or igniting local road design are unreasonable；Dual fire defector design, control system and sensor are not carried out
Matching degree it is poor；It is influenced by mechanical or condensed water, flare up fire is caused to lose.
The reason of discharged nitrous oxides instability problem in low-NO_x combustion technology are as follows: current low-NO_x combustion technology exists
No matter a degree of unstability uses circulating technology in full premix surface combustion technology, flue gas outside circulation, flue gas
Burner, exist equipment operation a period of time after, NOx emission increase the phenomenon that.Main cause is that boiler load is needed with heating
Frequent variation is asked, the mechanical structures frequent movement such as burner servo, connecting rod, air door causes the accumulation of machine error, leads to air inlet
The variation of amount causes furnace chamber inner combustion state to change, and the NOx content in flue gas has greatly changed.
The reason of condensing water problems is also easy to produce in low-NO_x combustion technology are as follows: condensation water problems is referred in flue gas recirculation
The phenomenon that type burner low temperature fresh air and high-temperature flue gas hybrid position, vapor condenses to the cold, generates more condensed water.It generates
Condensed water can not be discharged in time will lead to burner electronic component dampness, increase the failure rate of electronic component.Meanwhile it condensing
The corrosion of water meeting accelerating jet component and ignitor, causes the reduction of component service life.
Combustion gas in low-NO_x combustion technology boost problem the reason of are as follows: current low-NO_x combustion technology is required to promote gas valve
The gaseous-pressure of group inlet side reaches the mesh for reducing discharged nitrous oxides to enhance the uniformity coefficient of combustion gas and air mixing
's.The combustion gas boosting problem of low nitrogen transformation project is the generally existing common problem of current low NO.
The reason of noise problem in low-NO_x combustion technology are as follows: current full premix surface type burner stablizes sky when burning
Gas excess coefficient is 1.5~1.8, and compared to the excess air factor of conventional burners 1.2 or so, the full surface type burner that premixes exists
It needs to introduce more excess airs in combustion process.Current flue gas recirculation type burner removes introducing and biography in combustion
It unites outside the identical combustion air of burner, also needs the flue gas for additionally introducing 10%-20%.Both the above situation, is required to blower
Through-current capacity increases.It is limited to the technical characterstic of current low NO, the fresh-air fan power type selecting of burner is compared with traditional combustion
Device is big, causes low NO noise much larger compared with conventional burners.After selecting flue gas outer circulation type burner, with introducing
The increase of outer circulation exhaust gas volumn can cause boiler and burner vibration to increase, so that noise be made to further increase.
The reason of reduction boiler efficiency in low-NO_x combustion technology and power output problem are as follows: current low-NO_x combustion technology is required to
The maximum output of boiler is reduced, that is, reduces maximum deliverability of gas, can be only achieved the purpose for reducing discharged nitrous oxides.This meeting
Cause boiler heating capacity itself or producing steam ability to decline, influences resident's heating quality or plant produced benefit.Low nitrogen transformation
The underrun problem of project is the generally existing common problem of current low NO.Existing combustion system is due to air side
The reasons such as air quantity increases or flue gas reheats can increase boiler thermal efficiency loss to a certain extent, reduce boiler thermal efficiency,
Cause additional energy loss.
Utility model people is directed to above-mentioned discovery, is improved by the structure to super low NO, makes full use of micro- logical
Road distribution burner flame is ground using combustor structure method and the model parameter setting of " microchannel distribution flame "
Study carefully, have developed novel super low NO, the technical issues of to solve above-mentioned discovery.
Utility model people is directed to above-mentioned discovery, since the combustion mode of gas fired-boiler in atmospheric conditions is between fold flame
Between face and distributed combustion, thus the turbulent combustion model that tradition is assumed dependent on flame front and constructed can be in the presence of not applicable
Situation, combustion model need more to consider the influence of combustion kinetics.Therefore, project team is quasi- burns for gas fired-boiler
The special operation condition of application simplifies reaction mechanism by the burning developed under corresponding working condition, and applies EDC (Eddy
Dissipation Concept) model considers detailed chemical reaction process.The test result of pilot plant test platform is utilized simultaneously,
Combustion Flow Field and discharge model are calibrated, with the numerical simulation of improvement " microchannel distribution flame " super low NO
Precision.
Utility model people is directed to above-mentioned discovery, by early period to " microchannel distribution flame " technical research and Numerical-Mode
It is quasi-, the power of prototype burner is distributed and is distributed by burning head end wall, is converted to along fire tube circumferential distribution.So as to by changing
Become number of rows and the quantity in microring array channel to adapt to the variation of burner rating.
Utility model people is directed to above-mentioned discovery, the burning numerical model and parameter setting method by application by calibration,
A large amount of scheme comparison is carried out, preferably goes out the technical solution to suit the requirements and is processed and tested, to reduce test adjustment work
Amount and acquisition optimal technical solution.
Microchannel provided by the utility model is distributed super low NO, can be realized ultralow NOx discharge (NOx≤
15mg/m3(@3.5%O2)), and NOx≤30mg/m usually only may be implemented in low NO in the prior art3Discharge.
Fig. 1 is the structural schematic diagram that super low NO is distributed according to the microchannel of the utility model one embodiment.Fig. 2
It is the structural schematic diagram that the burner head of super low NO is distributed according to the microchannel of the utility model one embodiment.Figure
3 be the structural representation that the burner head of super low NO is distributed according to the microchannel of the utility model another embodiment
Figure.It is described in detail below with reference to Fig. 1 to Fig. 3,
A kind of microchannel provided by the utility model is distributed super low NO, including burner body 1 and burner head
Portion 2.Burner body 1 is equipped with fuel gas pipeline and combustion-supporting air pipe line.Burner head 2 includes main fuel pipe 21 and is set in main combustion
Sleeve 22 outside expects pipe 21.Main fuel pipe 21 is connected to fuel gas pipeline, and sleeve 22 is connected to combustion-supporting air pipe line.The axial cloth of main fuel pipe 21
Set multiple rows of primary fuel hole 211.Sleeve 22 is disposed with combustion-supporting air holes 221 corresponding with each primary fuel hole 211.Each
Primary fuel hole 211 is configured with injection equipment 212.Injection equipment 212 protrudes into combustion-supporting air holes 221, so that fuel 3 and combustion air 4
It is mixed in combustion-supporting air holes 221, to form multiply distribution flame at combustion-supporting air holes 221.
Burner body 1 can be the part that low NO in the prior art removes combustion head.To old tradition
When burner improves, it is only necessary to which the microchannel that its fuel gas pipeline is connected to the utility model is distributed to the burning of super low NO
The microchannel of its combustion air pipeline connection the utility model is distributed the combustion of super low NO by the main fuel pipe 21 on device head 2
The sleeve 22 of burner head 2, utmostly reduces the change to boiler body, is conducive to carry out safety to old boiler
Efficient low nitrogen retrofit work.
Specifically, injection equipment 212 is the hollow fuel rod for being mounted on primary fuel hole 211.Fuel rod will be for that will lead
The fuel 3 of cartridge 21 is delivered at corresponding combustion-supporting air holes 221, in order to which fuel 3 and combustion air 4 are in combustion-supporting air holes 221
It is mixed.One primary fuel hole 211, corresponding fuel rod and corresponding combustion-supporting air holes 221, form a microchannel.Often
Setting is stretched along the radial direction of burner head 2 in one microchannel.Burner head 2 is provided with multiple microchannels.It is multiple
Microchannel is evenly distributed on burner head 2.Of course, microchannel is also possible to that burner head is arranged in other manners
Portion 2, for example microchannel is arranged on burner head 2 with helical radiation shape, or is arranged with tufted distribution in burner head 2
On.Preferably, as shown in Fig. 2, microchannel is evenly provided on burner head 2 with multiple rows of ring-type, combustion air 4 and fuel 3
One flame is formed after the mixing of each microchannel, multiple microchannel burnings just form multiply distribution flame, thus with
So that exporting to form uniform multi beam distribution flame in microchannel.
Due to introducing " microchannel distribution flame " technology in periphery, fuel is sprayed into the utility model by multiply cartridge
One-to-one microring array channel, and export to form distributed flame in microchannel.Since fuel and combustion air are only shorter
It is mixed apart from interior, thus the problems such as the tempering without traditional premixed combustion mode and flame stabilization.
Utility model people's early period to " microchannel distribution flame " technical research and numerical simulation, by the function of prototype burner
Rate distribution is distributed by burning head end wall, is converted to along fire tube circumferential distribution.So as to pass through the number of rows for changing microring array channel
The variation of burner rating is adapted to quantity.For example, under normal pressure burning condition, by adjusting the parameter of microchannel to adjust
The load of burner, so that the power of burner changes correspondingly.The parameter of microchannel includes the quantity of microchannel, combustion-supporting air holes
221 diameters, 221 length of combustion-supporting air holes, fuel shank diameter, fuel pole length, mixing length, spacing.Wherein, mixing length is combustion
Expect the length at the top of bar and the outer surface of combustion-supporting air holes 221；Spacing includes the axial spacing of microchannel and the week of microchannel
To spacing.The microchannel of the utility model is distributed super low NO, it is only necessary to which changing these parameters both may be implemented burner
The control of different capacity, flame forms etc. greatly simplifies the design efforts would of subsequent combustion device seriation development.
Specifically, super low NO is distributed to the microchannel of the utility model and carries out the parameter adjustment of microchannel under
Table 1
1 microchannel distribution flame adjusting parameter of table and term of reference
In another embodiment, as shown in figure 3, combustion-supporting air holes 221 protrudes the outer surface of sleeve 22, sleeve can be reduced
While 22 thickness, the required design of the length of combustion-supporting air holes 221 is realized, to extend combustion air 4 and fuel 3 in combustion air
Mixing length in hole 221 realizes the uniform mixing of combustion air 4 and fuel 3.
Optionally, a kind of microchannel of the utility model is distributed super low NO, is also devised with Swirl and on duty
Flame.The end of main fuel pipe 21 is provided with secondary fuel hole 213.Main fuel pipe 21 at secondary fuel hole 213 is set
Diameter is less than the diameter of the main fuel pipe 21 at setting primary fuel hole 211.It is provided in the end of main fuel pipe 21 for drawing
The flow guiding disc 214 of combustion-supporting wind circulation is led, so that combustion air is mixed to form flame on duty by flow guiding disc 214 and fuel.Center rotation
The design of stream and flame on duty, so that the flame that microchannel is distributed super low NO is more stable.
A kind of microchannel provided by the utility model is distributed super low NO, by the way that in burner head, axially arrangement is more
Microchannel is arranged, each microchannel configures fuel injection mechanism, exports to form multi beam distribution flame in microchannel.And main fuel pipe
End be provided with flow guiding disc, to form rotational flow air and flame on duty, to enhance flame holding.
A kind of microchannel provided by the utility model is distributed super low NO, makes full use of microchannel distribution flame skill
The features such as art " minimum discharge, flame compact, highly resistance tempering/flameholding performance ", the minimum discharge of NOx is realized, can not only be solved
The certainly deficiency of premixed combustion technology prevents the security risks such as tempering and flameholding, Er Qieneng caused by its flame propagation speed
Solve the irrealizable ultralow nitrogen discharged standard of fractional combustion institute.
A kind of microchannel provided by the utility model is distributed super low NO, solves gas fired-boiler low nitrogen transformation field
There is currently technical bottleneck (such as further decrease that Emission potential is limited, boiler furnace matching high to gaseous-pressure requirement requires
It is high), the adaptability of burner and boiler is improved, and improve the thermal efficiency of boiler.
So far, although those skilled in the art will appreciate that showing for the utility model has been shown and described in detail herein
Example property embodiment still, still can be according to disclosed by the utility model in the case where not departing from the spirit and scope of the utility model
Content directly determines or derives many other variations or modifications for meeting the utility model principle.Therefore, the utility model
Range is understood that and regards as to cover all such other variations or modifications.
Claims (8)
1. a kind of microchannel is distributed super low NO characterized by comprising burner body and burner head, it is described
Burner body is equipped with fuel gas pipeline and combustion-supporting air pipe line, and the burner head includes main fuel pipe and is set in the main combustion
Sleeve outside expects pipe；The main fuel pipe is connected to fuel gas pipeline, and the sleeve is connected to combustion-supporting air pipe line；
The main fuel pipe axially arranges multiple rows of primary fuel hole, and the sleeve is disposed with and primary fuel hole pair described in each
The combustion-supporting air holes answered, each described primary fuel hole are configured with injection equipment, and the injection equipment protrudes into the combustion-supporting air holes,
So that fuel and combustion air mix in the combustion-supporting air holes, to form multiply distribution flame at the combustion-supporting air holes.
2. microchannel according to claim 1 is distributed super low NO, which is characterized in that the end of the main fuel pipe
It is provided with secondary fuel hole.
3. microchannel according to claim 2 is distributed super low NO, which is characterized in that the end of the main fuel pipe
It is provided with the flow guiding disc for guiding combustion-supporting wind circulation, so that combustion air is mixed to form flame on duty by flow guiding disc and fuel.
4. microchannel according to claim 2 is distributed super low NO, which is characterized in that at setting secondary fuel hole
The diameter of main fuel pipe is less than the diameter of the main fuel pipe at setting primary fuel hole.
5. microchannel according to claim 1 is distributed super low NO, which is characterized in that the injection equipment is installation
Hollow fuel rod in the primary fuel hole.
6. microchannel according to claim 5 is distributed super low NO, which is characterized in that a primary fuel
Hole, fuel rod and corresponding combustion-supporting air holes, form a microchannel, and the microchannel is arranged with radial direction.
7. microchannel according to claim 6 is distributed super low NO, which is characterized in that the quantity of the microchannel is
Multiple, the microchannel is uniformly distributed.
8. microchannel according to claim 1 is distributed super low NO, which is characterized in that the combustion-supporting air holes protrudes institute
State the outer surface of sleeve.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109058992A (en) * | 2018-08-29 | 2018-12-21 | 北京水木星源环保科技有限公司 | A kind of super low NO of microchannel distribution |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109058992A (en) * | 2018-08-29 | 2018-12-21 | 北京水木星源环保科技有限公司 | A kind of super low NO of microchannel distribution |
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