CN107036083A - A kind of small-sized kiln combustion system - Google Patents
A kind of small-sized kiln combustion system Download PDFInfo
- Publication number
- CN107036083A CN107036083A CN201710427499.8A CN201710427499A CN107036083A CN 107036083 A CN107036083 A CN 107036083A CN 201710427499 A CN201710427499 A CN 201710427499A CN 107036083 A CN107036083 A CN 107036083A
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- burner
- air
- fuel
- center line
- air port
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/02—Disposition of air supply not passing through burner
- F23C7/06—Disposition of air supply not passing through burner for heating the incoming air
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
Abstract
The present invention discloses a kind of small-sized kiln combustion system, includes burner hearth, furnace wall, furnace roof, fire door and hold over system；The hold over system includes two storage heaters, airflow-reversing system, air blower, air-introduced machine and computerized control system；Described combustion system also includes a burner and two air ports；Burner is used to send into fuel into burner hearth；One end of each storage heater is connected with an air port, the other end is connected with airflow-reversing system, and computerized control system controls the main combustion air to form heat accumulating type waste heat recovery and be supplied with its heating by air port；Another air port is discharged fume during an air intake in two air ports；Burner and two scenery resource qualities are on furnace wall or furnace roof；Burner is straight hole, and burner center line is vertical with furnace roof when being arranged in when on furnace wall that the projection of burner center line in the horizontal plane is vertical with the furnace wall that it is installed, being arranged in furnace roof；Nozzles are installed, nozzles provide fuel to burner hearth inside burner；Two air ports are arranged symmetrically using the vertical plane for crossing burner center line as the plane of symmetry.The small-sized kiln combustion system of the present invention is on the premise of speed of production is ensured, energy consumption is lower, more saves.
Description
Technical field
The invention belongs to heat power engineering field, the small-sized kiln combustion system that more particularly to a kind of flame does not commutate.
Background technology
The burning of disperse formula is a kind of different from premix combustion and the new combustion system of diffusion combustion.
Premix combustion：Fuel and combustion air complete to light after uniform mixing into combustion before the ignition point of burner
The combustion system burnt in the combustion chamber of burner.Its advantage is：Burning velocity is fast, and flame is short, intensity is high and powerful and vigorous, burning
Building volume is small；It can guarantee that firing rate.It has the disadvantage：Combustion flame local temperature height (is fuel, excess air such as with natural gas
The premixed combustion flame kernel local temperature of factor alpha=1 is up to more than 2000 DEG C), with substantial amounts of NOXProduce, and NOXIt is big
One of main arch-criminal of gas pollution；Localized hyperthermia causes the body of heater or furnace wall rapid wear close to burner, accelerates the loss of property；
There is tempering.
Diffusion type burns：Fuel is not pre-mixed with any combustion air, but it is empty to allow fuel inflow/or high speed to inject
Gas, the combustion system for contacting and then burning with the oxygen in air is spread by fuel in atmosphere.Its advantage is：Burning is steady
It is fixed, it will not be tempered, it is reliable；NOx pollutant emissions are few；Easily manufacture simple to burner requirement.It has the disadvantage：Burning velocity
Slowly, flame length, low intensity and weak and feeble, combustion chamber volume is big；Firing rate is slow.So industrial combustion field is seldom used.
Disperse formula is burnt：Be take combustion air speed higher than speed fuel mode of jet by fuel (usual fuel and
Few part combustion air mixing is to keep flame stabilization) and combustion air separately inject in stove, quick combustion air air-flow is rolled up
Combustion product in suction fuel material and stove, the oxygen-containing volumetric concentration in diluting reaction area, it is 3~15% (rapidss that volume suction is produced to obtain concentration
Stream group inner volume concentration) hypoxic atmosphere.Fuel is gradually combined burning in this high-temperature low-oxygen atmosphere with oxygen, and with entering
Row cracking etc. regrouping process, cause with advance
Mixed burning and the entirely different thermodynamic condition of diffusive combustion process, are released in the case where making to delay shape to burn with Poor oxygen gas
Go out heat energy, no longer there is the hyperoxia area of localized hyperthermia occurred during traditional combustion.This is a kind of to need the new of numerous studies
Combustion system, the advantage for having concentrated premix combustion and diffusion type to burn：Flame rigidity can by force can be weak, burning velocity soon can may be used
Slowly, flame region is big, firing rate is can guarantee that, while combustion flame temperature does not have area of localized hyperthermia uniformly.Due to combustion flame
Temperature does not have localized hyperthermia, thus NOXProduction rate is reduced, while extending body of heater or furnace wall service life.
Heat storage type combustion：Heat storage type combustion is by the way that using storage heater, alternately savings tail gas heat quantity and release heat add in pairs
Hot combustion air, a kind of energy-saving combustion technology of burning is participated in heated combustion air.Because heat-accumulation combustion is energy-efficient,
Heat-accumulation combustion uses premix combustion for a long time, and combustion air, which enters before burner hearth, to be sufficiently mixed and catch fire with fuel in burner
Enter burner hearth afterwards, so for the switching for coordinating air intake and smoke evacuation, it is necessary to which two nozzles simultaneously switch flame when wind direction switches,
I.e. flame is also intended to commutation.This frequently flame switching enhances the shortcoming of premix combustion, causes frequent detonation, furnace pressure
Excessive, fire door, furnace wall equivalent life is fluctuated to greatly shorten.
Disperse formula, which is burnt, has both the advantage of two kinds of combustion systems of premix combustion and diffusion combustion, just there is scientific and technical personnel in one's early years
Research, heat-accumulation combustion and disperse formula combustion technology are combined.On back yard industry stove (such as less than 50 tons aluminium melting furnaces), due to sky
Meta is equipped with limit, therefore uses using the minimum design of equipment, i.e., (a pair of air ports of correspondence, realize heat accumulating type to a pair of storage heaters
Waste heat recovery needs minimum two storage heaters to be used alternatingly) plus the design method of a burner (including nozzles) be that a kind of reality is needed
Will.But countless practices is so that energy-saving effect is not good, fusing speed of production is too slow or equipment life is too short under this design method
Counted out Deng fatal problem.Because it adds a burner to combine by two air ports, burner is located at the interposition in two air ports
Put.An air port inputs combustion air in two air ports, then another air port will extract flue gas out.Air port and the mutual position of burner
If put, the size in air port, the direction in air port, the design such as air quantity wind speed size it is bad, following situation just occurs：
1st, system speed of production is slow；
2nd, into the combustion air of burner hearth when wind speed too small (such as air quantity is too small, tuyere diameter is too big), air port direction be not reciprocity
Momentum is not enough not enough to greatly volume and inhales the fuel for entering burner hearth from burner, causes burn incompletely；
3rd, the positional distance of air port and burner not pair when enter the fuel of burner hearth from burner, the air port for being extracted flue gas is suctioned out
Burner hearth, equally causes imperfect combustion；
4th, combustion air and fuel are sufficiently mixed and fully burning of burning, but if the height of air port and burner
Not right, flame not in burner hearth, deploy by disperse formula, but is suctioned out by another air port, causes temperature in storage heater too high, makes
It is hardened or even storage heater is burnt out into heat-storing material；
5th, burner hearth flow field can be had a strong impact on when tuyere diameter size, direction are unreasonable etc., so as to influence heat transfer, is led
Cause energy-saving effect not good；
If problem above is not solved, preferable disperse formula combustion efficiency is just unable to reach.
The content of the invention
To solve the above problems, it is an object of the invention to provide a kind of small-sized kiln combustion system, ensureing production speed
On the premise of degree, energy consumption is lower, more saves.
To achieve the above object, the technical scheme is that：
A kind of small-sized kiln combustion system, includes burner hearth, furnace wall, furnace roof, fire door and hold over system；The accumulation of heat
System includes two storage heaters, airflow-reversing system, air blower, air-introduced machine and computerized control system；Described burning system
System also includes a burner and two air ports；Burner is used to send into fuel into burner hearth；One end of each storage heater with one
Air port is connected, the other end is connected with airflow-reversing system；Another air port is discharged fume during an air intake in two air ports；Burner with
Two air ports are arranged on furnace wall or furnace roof；Burner center line is in the horizontal plane when burner and two scenery resource qualities are on furnace wall
The furnace wall installed with it of projection into 70-90 ° of angle, be arranged in furnace roof when burner center line and 70-90 ° of horizontal plane angle；Fire
Nozzles are installed in intraoral portion, and nozzles provide fuel to burner hearth；Two air ports are arranged with the vertical plane both sides for crossing burner center line；Stove
Burner center and air port centre distance l1 and l2 are between 0.25 meter~1.5 meters in thorax inner wall surface
Further, the angle α that system is arranged in burner center line and horizontal plane when on furnace wall is 0 °~25 °, is arranged in
The angle of burner center line and vertical line is 0 °~20 ° when on furnace roof.
Further, system is arranged in the angle that burner center line is projected in the horizontal plane with air port center line when on furnace wall
θ is 0 °~40 °, is arranged in burner center line and the angle that air port center line is projected on the vertical plane when on furnace roof maximum 40 °.
Further, in burner hearth inner wall surface burner center and air port centre distance l1 and l2 between 0.25 meter~1.5 meters.
Further, in burner hearth inner wall surface the horizontal plane h2 where burner central point and fire door sill upper surface be 50~
750。
Further, burner hearth inner wall surface uptake central point is -200~600 apart from h1 higher than burner central point.
Further, air needed for fuel when the air capacity supplied in the auxiliary wind passage of nozzles is excess air coefficient α=1
The 5%~35% of amount, the 65% of fuel required air quantity when the air capacity of the air port of air intake supply is excess air coefficient α=1
~265%.
Further, unit area air mass flow is in the air port of air intake：8kg~45kg/ Miao ㎡.
Further, area of section scope in air port is 50cm2~3600cm2。
Further, air port exit can be tubaeform, flare portion area of section for air port area of section 1~
3 times.
Further, the diameter of burner sets as follows：When fuel is natural gas, heavy oil, kerosene, diesel oil, the face of burner
Product is set to 50cm2~900cm2Between；When fuel is coal gas, solid, powdery fuel, the area of burner is arranged on 450cm2~
5000cm2Between.
Further, nozzles are exported to burner hearth wall length with burner equivalent diameter (with burner area identical in burner
Diameter of a circle) ratio be：0.5~4.0.
Further, include inside nozzles inside fuel channel and auxiliary wind passage, nozzles or side can increase igniting
Rifle, burning torch automatic electronic ignition and system can steady normal work when providing ever-burning flame to ensure that hold over system switches repeatedly
Make.
Further, fuel channel is connected with fuel tube, sets fuel duty to control on fuel tube
Device.
Compared to prior art, small-sized kiln combustion system of the invention is on the premise of speed of production is ensured, energy consumption is lower,
More save.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, makes required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those skilled in the art, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the axonometric drawing schematic diagram of small-sized kiln combustion system of the invention.
Fig. 2 is the section diagram of small-sized kiln combustion system of the invention.
Fig. 3 is illustrated along B-B cutting in Fig. 2；
Fig. 4 is illustrated along D-D cutting in Fig. 2；
Fig. 5 is illustrated along E-E cutting in Fig. 2.
Embodiment
To enable the object of the invention, feature, advantage more obvious and understandable, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that implementation disclosed below
Example is only a part of embodiment of the invention, and not all embodiments.Based on the embodiment in the present invention, those skilled in the art
The every other embodiment that member is obtained, belongs to the scope of protection of the invention.
Term " first ", " second " in description and claims of this specification and above-mentioned accompanying drawing etc. are to be used to distinguish
Similar object, without for describing specific order or precedence.It should be appreciated that the term so used is in appropriate feelings
It can be exchanged under condition, this is only the differentiation for describing to use the object of same alike result in description in embodiments of the invention
Mode.In addition, term " comprising " and " having " and their any deformation, it is intended that covering is non-exclusive to be included, so as to
Process, method, system, product or equipment comprising a series of units are not necessarily limited to those units, but may include unclear
Other units that ground is listed or for these processes, method, product or equipment inherently.
Shown in reference picture 1-4, the present invention provides one and uses natural gas for 20 tons of aluminium melting furnace disperse formulas burning system of fuel
The embodiment of system, is described in detail individually below.
As shown in Fig. 2 a kind of small-sized kiln combustion system of the embodiment of the present invention includes furnace wall 1, burner hearth 2, furnace roof (in figure
It is not shown), fire door 11 and hold over system；Wherein, hold over system includes left storage heater 9, right storage heater 4, airflow-reversing system
System 6, blowing line 7, air blower 12, air inducing pipeline 5, air-introduced machine (not shown) and and computerized control system (in figure not
Show).
Combustion system of the present invention also includes a burner 11 and left air port 10, right air port 3；Burner 11 be circular port be used for
Feeding fuel in burner hearth 2；Left one end of storage heater 9 is connected with left air port 10, the other end is connected with airflow-reversing system 6, right accumulation of heat
The one end of device 4 is connected with right air port, the other end is connected with airflow-reversing system 6.The one end of blowing line 7 and the phase of airflow-reversing system 6
Even, the other end is connected with air blower 12, the one end of air inducing pipeline 5 is connected with airflow-reversing system 6, and the other end is with air-introduced machine (in figure
It is not shown) connection.The master to form heat accumulating type waste heat recovery and be supplied with its heating by air port is controlled by computerized control system
Combustion air, computerized control system is existing mature technology, therefore is not described in detail；When an air intake in two air port,
Another smoke evacuation.Air port is circle without flaring exit.Burner 11 is arranged on furnace wall with left air port 10, right air port 3；Fire
Mouth 11 is a straight circular hole, and the projection of the center line of burner 11 in the horizontal plane is vertical with the one side for the furnace wall 1 that it is installed (90 °
Angle)；Nozzles 8 are installed, nozzles 8 provide fuel to burner hearth 2 inside burner 11.Left air port 10, right air port 3 are with the center of burner 11 excessively
The vertical plane of line is arranged symmetrically for the plane of symmetry.
Shown in reference picture 3, Fig. 4, wherein, the angle α of the center line of burner 11 and horizontal plane is 10.5 °；Left air port 10, right wind
The center line of mouth 3 angle beta of projection line and horizontal plane on the vertical plane of center line for crossing burner 11 is 8.5 °.In burner 11
Heart line is 25 ° with the angle theta (shown in Fig. 2) that left air port 10, the center line in right air port 3 are projected in the horizontal plane.The inner wall surface of burner hearth 2
Upper burner center is 0.5~2.0 meter with air port centre distance l1 and l2 (shown in Fig. 5), and this example takes 0.9 meter；In the inner wall surface of burner hearth 2
Burner central point is 50~750 with the horizontal plane h2 where fire door sill upper surface, and this example takes 350, the inner wall surface windward of burner hearth 11
Mouth central point is -200~600 apart from h1 higher than burner central point, and this example takes 300.All scale errors allow ± 15%.
In addition, including fuel channel and auxiliary wind passage inside nozzles 11, fuel duty is designed as 250Nm per hour3
Natural gas.The 10% of fuel required air quantity when the air capacity supplied in the auxiliary wind passage of nozzles is excess air coefficient α=1, i.e.,
For 250Nm3.The 130% of fuel required air quantity, i.e., whole when the air capacity of the air port supply of air intake is excess air coefficient α=1
The coefficient of excess air of individual system is α=1.4.Unit area air mass flow is in the air port of air intake：16.47kg/ Miao ㎡,
A diameter of (area 706.86cm of Φ 3002), it is ensured that suction burner stream can be rolled up by injecting the air capacity and speed (enough momentum) of burner hearth
The fuel and imperfect combustion product entered.
Especially, if burner hearth needs flame travel especially long, can by increase the working frequency of air blower 12 come
Increase coefficient of excess air α values reduce tuyere diameter so as to which the mode for the speed for improving air intake air port wind reaches best disperse
Formula combustion efficiency.
Further, (area is 143.14cm to a diameter of Φ 135 of burner 112)；Nozzles 8 are exported to burner hearth 2 in burner 11
The length of wall is 270, and the ratio with equivalent diameter (being equal to diameter of a circle 135) is：2.0.
Further, fuel channel and auxiliary wind passage are included inside nozzles 8, the inside of nozzles 8 or side, which can increase, to be set
Put burning torch, burning torch automatic electronic ignition and system can steadily just when providing ever-burning flame to ensure that hold over system switches repeatedly
Often work.
When system converts the operating position of exchange system under computer control, system carries out disperse formula heat-accumulation combustion,
Realize that the heat accumulating type of waste heat reclaims the combination burnt with disperse formula.
When system reaches stable state, main air temperature can be preheating to more than 800 DEG C, by 800 DEG C of calculating, the main wind of system
Air velocity is that (16-17kg/ seconds ㎡ flow rate conversion is 12-13 meter per seconds to 45-46 meter per seconds under standard state, because heated in passage
Speed of expansion increase), the speed of air-flow 2 containing fuel is 9.7 meter per seconds or so in nozzles.The furnace width of 20 tons of aluminium melting furnaces is general
At 3.5~4.5 meters or so, thus using the disperse formula combustion system of this design, flame can cover most of burner hearth substantially
Simultaneously without localized hyperthermia, NOx emission is reduced while reducing the scaling loss of aluminium.
In summary, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to upper
Embodiment is stated the present invention is described in detail, it will be understood by those within the art that：It still can be to upper
State the technical scheme described in each embodiment to modify, or equivalent substitution is carried out to which part technical characteristic；And these
Modification is replaced, and the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (5)
1. a kind of small-sized kiln combustion system, includes burner hearth, furnace wall, furnace roof, fire door and hold over system, it is characterised in that：
The hold over system includes two storage heaters, airflow-reversing system, air blower, air-introduced machine and computerized control system；It is described
Combustion system also include a burner and two air ports；Burner is used to send into fuel into burner hearth；The one of each storage heater
End is connected with an air port, the other end is connected with airflow-reversing system；Another air port is arranged during an air intake in two air ports
Cigarette；Burner and two air ports are arranged on furnace wall or furnace roof；Burner center line when burner and two scenery resource qualities are on furnace wall
The furnace wall that projection in the horizontal plane is installed with it into 70-90 ° of angle, be arranged in furnace roof when burner center line and horizontal plane angle
70-90°；Nozzles are installed, nozzles provide fuel to burner hearth inside burner；Two air ports are with the vertical plane two of burner center line excessively
Side is arranged；Burner center and air port centre distance l1 and l2 are between 0.25 meter~1.5 meters in burner hearth inner wall surface.
2. small-sized kiln combustion system as claimed in claim 1, it is characterised in that：Burner center when system is arranged on furnace wall
The angle α of line and horizontal plane is 0 °~25 °, and the angle for being arranged in burner center line and vertical line when on furnace roof is 0 °~20 °.
3. small-sized kiln combustion system as claimed in claim 1, it is characterised in that：Burner center when system is arranged on furnace wall
The angle theta that line is projected in the horizontal plane with air port center line is 0 °~40 °, when being arranged on furnace roof in burner center line and air port
The angle that heart line is projected on the vertical plane is maximum 40 °.
4. small-sized kiln combustion system as claimed in claim 1, it is characterised in that：The area of burner sets as follows：Work as fuel
During for natural gas, heavy oil, kerosene, diesel oil, the area of burner is set to 50cm2~900cm2Between；When fuel is coal gas and solid
During dusty fuel, the area of burner is arranged on 450cm2~5000cm2Between.
5. small-sized kiln combustion system as claimed in claim 1, it is characterised in that：Include fuel channel inside nozzles and auxiliary
Inside wind passage, nozzles or side can increase burning torch, and burning torch automatic electronic ignition simultaneously provides ever-burning flame to ensure to store
System can steady normal work when hot systems switch repeatedly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710427499.8A CN107036083A (en) | 2017-06-08 | 2017-06-08 | A kind of small-sized kiln combustion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710427499.8A CN107036083A (en) | 2017-06-08 | 2017-06-08 | A kind of small-sized kiln combustion system |
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| Publication Number | Publication Date |
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| CN107036083A true CN107036083A (en) | 2017-08-11 |
Family
ID=59540967
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| CN201710427499.8A Pending CN107036083A (en) | 2017-06-08 | 2017-06-08 | A kind of small-sized kiln combustion system |
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