Background technology
Relatively advanced HTAC is applied on gas fired radiant tubes burner heat accumulation type radiant tube, main
Will be with coal gas as fuel, in special sealing shroud combustion inner pipe, by the sleeve surface that is heated with thermal-radiating form heat
Pass to heating object, combustion product is not contacted with heating object, and by the setting of heat storage using set combustion inner pipe
The sensible heat of flue gas comes warm-up combustion-supporting air or combustion gas afterwards, has the spies such as combustion thermal efficiency is high, stable, equipment dependability is high
Point, is widely used in various heat-treatment furnaces and continuous annealing furnace.
At present, Publication No. p2000-356310a, patent name is regenerative radiant tube burner
Japan Patent provide a kind of double ended type regenerative radiant tube burner, this burner employs the shape of Researched of Air Staging Combustion Burning Pulverized Coal
Formula, devises the shape of two class auxiliary air spouts simultaneously, changes radial canal week by auxiliary air spout of different sizes
To the troubled water of direction combustion product gases and auxiliary air, thus improving the Temperature Distribution of radial canal circumferential direction.However, radiation
After pipe circumferential direction combustion product gases are mixed with auxiliary air, reduce nox discharge to a certain extent, but flame directly washes away
Radiation pipe-in-pipe tube wall, the service life of impact set tube wall Axial Temperature Distribution uniformity and sleeve pipe.
The Japan Patent of Publication No. jp2007-278963a provides a kind of regenerative radiant tube burner, by pipe
Internal lining pipe and combustion barrel device iris action make combustion air occur fractional combustion.But this burner apparatus adjusts air to be divided
The motility of level air feed ratio is poor;And primary combustion is consistent with second-time burning outlet bore, flame export speed, flameholding
Property aspect has certain limitation.
The performance of regenerative gas radiant tube combustion device is mainly with combustion thermal efficiency, sleeve pipe tube wall temperature in sleeve pipe
In distributing homogeneity and flue gas, nox discharge capacity is evaluated.At present, because regenerative gas radiant tube combustion device covers combustion inner pipe
Organizational structure is unreasonable, has a strong impact on the set uniformity of tube wall Axial Temperature Distribution and the service life of sleeve pipe.
The uniformity of radial canal surface temperature distribution is to weigh an important indicator of radial canal performance, and it mainly has influence on
Life-span of the heating quality of radial canal and radial canal etc., and the principal element affecting radial canal surface temperature distribution uniformity is combustion
Gas and the mixing situation of air.Combustion gas is lower with the mixing intensity of air, then incorporation time is elongated, flame elongates, and combustion gas can not
Burn completely, radial canal surface temperature distribution uniformity reduces, combustion gas also can be caused to waste, reduce the efficiency of heating surface of radial canal;
If air is excessive with the mixing intensity of combustion gas, incorporation time shortens, flame is too short, equally can make radial canal surface temperature distribution
Inhomogeneities increase.
Utility model content
(1) technical problem to be solved
The purpose of this utility model is to provide a kind of regenerative gas radiant tube combustion device, to solve existing heat accumulating type combustion
Gas radiant tube combustion device second-time burning tissue is unreasonable, and flame export speed is low, poor combustion stability, set tube wall axially temperature
Degree skewness, the problems such as radial canal Service Life of Casing is short.
(2) technical scheme
In order to solve above-mentioned technical problem, this utility model provides a kind of regenerative gas radiant tube combustion device, bag
Include heat storage, radiation pipe-in-pipe, jet pipe, shower nozzle, the first muffle set and the second muffle set, described heat storage, described first muffle
Set and described second muffle set be sequentially arranged in described radiation pipe-in-pipe in, described first muffle set near described heat storage one
Hold in tapered shape to the one end covering near described second muffle;Described jet pipe is embedded in described heat storage, described nozzle set
It is connected in described first muffle set and with described jet pipe.
Wherein, described second muffle covers for straight tube shape.
Wherein, the outside of described first muffle set one end near the second muffle set is provided with fin.
Wherein, described shower nozzle is provided with swirl vane.
Wherein, described first muffle set with the second muffle set against fitting.
Wherein, the axial length of described second muffle set and the ratio of the axial length of described radiation pipe-in-pipe are not less than 1/3.
Wherein, described first muffle set and described second muffle set are made up of carborundum.
Wherein, described heat storage is cellular.
(3) beneficial effect
Technique scheme of the present utility model has the advantage that this utility model provides a kind of regenerative gas spoke
Penetrate combustion tube, by the first muffle set and the second muffle set of the gas outlet location arrangements tapered shape in shower nozzle, to realize fire
Form certain intervals between flame and radial canal sleeve outer wall, the length of flame can be extended simultaneously, improve radial canal sleeve pipe axially temperature
Degree distributing homogeneity, reduces the temperature difference of radial canal bushing outer surface, service life of radiant tubes Service Life of Casing, improves second-time burning
Tissue is unreasonable, improves combustion gas and mixes inequality with air, improves radiation pipe-in-pipe internal combustion and heats efficiency, saves fuel, make flue gas
Middle noxDischarge capacity reduces, and improves heat treated article heating quality.
Specific embodiment
With reference to the accompanying drawings and examples specific embodiment of the present utility model is described in further detail.Following reality
Apply example to be used for this utility model is described, but be not limited to scope of the present utility model.
In description of the present utility model, it should be noted that term " on ", D score, " interior ", the orientation of the instruction such as " outward "
Or position relationship is based on orientation shown in the drawings or position relationship, it is for only for ease of description this utility model and simplification is retouched
State, rather than instruction or the hint device of indication or element must have specific orientation, with specific azimuth configuration and operation,
Therefore it is not intended that to restriction of the present utility model.Additionally, term " first ", " second " are only used for describing purpose, and can not
It is interpreted as indicating or imply relative importance.
In description of the present utility model, it should be noted that unless otherwise clearly defined and limited, term " sets
Have ", should be interpreted broadly, for example, it may be being fixedly connected or detachably connecting " being placed in ", " being connected ", " connection " etc.
Connect, or be integrally connected;Can be to be mechanically connected or electrically connect;Can be to be joined directly together it is also possible to pass through middle matchmaker
Jie is indirectly connected to, and can be the connection of two element internals.For the ordinary skill in the art, can be with concrete condition
Understand concrete meaning in this utility model for the above-mentioned term.
As shown in figure 1, this utility model provides a kind of regenerative gas radiant combustion pipe, the in figure direction of arrow represents spoke
Penetrate the flow direction of combustion gas in pipe-in-pipe, and represent the front extreme direction of radiation pipe-in-pipe.This utility model includes heat storage 1, spoke
Penetrate pipe-in-pipe 5, jet pipe 6, shower nozzle 3, the first muffle set 2 and the second muffle set 4, heat storage 1, the first muffle set 2 and the second muffle
Set 4 is sequentially arranged in institute's pipe-in-pipe, as illustrated, heat storage 1, the first muffle set 2 and the second muffle set 4 are from radiation pipe-in-pipe 5
Rear end be arranged in order to front end.One end that first muffle set 2 covers 4 from one end of close heat storage 1 to close second muffle is in
Tapered shape, sees flare shape from front to back.Jet pipe 6 is embedded in heat storage 1, and shower nozzle 3 is sheathed on the first muffle
It is connected in set 2 and with jet pipe 6.Preferably, heat storage 1 adopts cellular heat storage.During use, combustion air flows from jet pipe 6
Enter, flow to shower nozzle 3, combustion air, through being preheated during heat storage 1, enters the first muffle set 2, with the ejection of shower nozzle 3 center
Coal gas mixes, and starts to burn in the front end of the first muffle set of tapered shape, and finally forms temperature in the second muffle set 4 and divides
Cloth is uniformly, burn completely flame.
This utility model passes through, in shower nozzle 3 exit position arrangement the first muffle set 2 and the second muffle set 4, to make flame and spoke
Penetrate formation certain intervals between pipe-in-pipe 5 pipe outer wall, realize set tube wall Axial Temperature Distribution uniform.First muffle set 2 is in gradually
Contracting shape, for example, tubaeform, improve the speed of flame export, make combustion air and combustion gas in the first muffle of tapered shape
Cover and be more fully mixed at 2 front ends, combustion stability strengthens.Preferably, described first muffle set 2 and described second muffle set 4
Be made up of carborundum, can more preferably realize above-mentioned technique effect.Cellular heat storage 1, makes heat storage 1 specific surface area increase,
Improve heat conductivility.
By shower nozzle 3 exit position arrangement first muffle set 2 and second muffle set 4, and coordinate muffle set shape and
Material, can improve radiation pipe-in-pipe 5 Axial Temperature Distribution uniformity, reduce the temperature difference of radial canal bushing outer surface, can simultaneously
Enough extend the length of flame, service life of radiant tubes sleeve pipe 5 service life, improve heat treated article heating quality, improve combustion gas and sky
The mixing situation of gas, radiation pipe-in-pipe internal combustion heats efficiency high, saves fuel, no in flue gasxDischarge capacity reduces.
Specifically, the outside of one end that the first muffle set 2 covers 4 near the second muffle is provided with fin.Can effectively enhanced rad
Pipe radial temperature profile, realizes set tube wall Axial Temperature Distribution uniform.First muffle set 2 with the second muffle set 4 against fitting,
The gap that heat is formed between the first muffle set 2 and the second muffle set 4 is avoided directly to wash away radiation pipe-in-pipe 5.
Specifically, the second muffle set 4 is straight tube shape, it is to avoid flame directly washes away radiation pipe-in-pipe tube wall, improves sleeve pipe
Tube wall Axial Temperature Distribution uniformity and Service Life of Casing.
Specifically, described shower nozzle 3 carries swirl vane.The spout 3 that combustion air flows through with swirl vane carries further
High gas flow rate, air-flow volume inhales the coal gas that spout sprays rotate at high speed to make spout, improves the mixed of combustion air and combustion gas
Conjunction situation, improves combustion thermal efficiency in radial canal, has saved fuel, effectively reduces the discharge capacity of nox in flue gas.
According to burner thermic load, the room temperature combustion air of certain flow reaches 700~900 after preheating through described heat storage 1
DEG C, described first muffle set 2 is entered with tense speed 30~50m/s, after flowing through the described shower nozzle 3 with vane cyclone, further
Improve combustion air flow velocity after preheating, the coal gas being sprayed with described shower nozzle 3 center is mixed, before described first muffle set 2
End starts to burn, and forms combustor in described first muffle set 2, and the flame being formed in described first muffle set 2 passes through institute
State radiation pipe-in-pipe 5, be axially formed homogeneous temperature field in radial canal, reduce local temperature difference, radial canal surface temperature is axially distributed
Uniformity is improved, the service life of radiant tubes life-span, improves heat treated article heating quality.
Specifically, the axial length of the second muffle set 4 and the ratio of the axial length of radiation pipe-in-pipe 5 are not less than 1/3, can have
Effect reduces formation flame in described first muffle set 2 and radiation tube wall high temperature is washed away.
In sum, this utility model passes through, in shower nozzle 3 exit position cloth the first muffle set 2 and the second muffle set 4, to realize
Form certain intervals between flame and radiation pipe-in-pipe 5 outer wall, reduce the temperature difference of radial canal bushing outer surface, can simultaneously
Extend the length of flame, improve radial canal sleeve pipe axial direction temperature distribution evenness, service life of radiant tubes Service Life of Casing, improve at heat
Reason control of industrial furnace home, improves the troubled water of combustion gas and air, improves radiation pipe-in-pipe internal combustion and heats efficiency, saves
Fuel, reduces no in flue gasxDischarge capacity.
The above is only preferred implementation of the present utility model it is noted that common skill for the art
For art personnel, on the premise of without departing from this utility model know-why, some improvement and modification can also be made, these change
Enter and also should be regarded as protection domain of the present utility model with modification.