CN209180946U - A kind of flame inner tube and its radiant tube applied in radiant tube - Google Patents
A kind of flame inner tube and its radiant tube applied in radiant tube Download PDFInfo
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- CN209180946U CN209180946U CN201822062457.1U CN201822062457U CN209180946U CN 209180946 U CN209180946 U CN 209180946U CN 201822062457 U CN201822062457 U CN 201822062457U CN 209180946 U CN209180946 U CN 209180946U
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Abstract
The utility model discloses a kind of flame inner tube and its radiant tube applied in radiant tube, by being equipped with flame inner tube, flame inner tube is sequentially provided with contraction pipeline section to the direction that outlet end extends along its input end, straight pipe and expanded pipe section, the flue gas to burn in burner passes through after flame inner tube, make high-speed flow injection periphery low speed flow by shrinking pipeline section, it blends and transmits energy, form injection area, then pass through straight pipe make injection air-flow with mixed by injection air-flow and form the equal pressure gas stream of average rate, finally flow velocity is reduced by expanded pipe section, improve static pressure, flame inner tube cooperates the enclosed type radiation tube body of single-ended import to apply from after preheating burner, can be flowed back inside smoke to greatest extent, after being mixed with combustion gas and combustion air, it forms mixture and carries out more mild and combustion system more evenly, the temperature for improving integral radiation pipe surface is equal Even property.
Description
Technical field
The utility model relates to radiant tube field, espespecially a kind of flame inner tube and its radiant tube applied in radiant tube.
Background technique
Radiant tube is formally born in relatively early (or so the 1930s) period, when conventional direct flame heating method cannot
When meeting certain specific heating environments and specific products and producing, a kind of indirect heating tool that people figure out.
Main two major classes of radiant tube now: electric heating radiant tube and combustion gas class radiant tube are usually used in industrial heating furnace
In heat-treatment furnace, wherein gas fired radiant tubes are relatively broad, and the thermal efficiency is higher.Due to being indirect heating, radiant tube be able to satisfy compared with
The control climate of good heating temperature uniformity and heating space, realizes the normal production of certain specific high request products.
Radiant tube application aspect mainly includes three elements: temperature uniformity, the thermal efficiency and service life, and country is to ring instantly
Guarantor's problem is more paid attention to, and the discharge of the pollutants such as NOx also becomes the important evaluation index of radiant tube heating.
Most common gas fired radiant tubes are I, U and W type radiant tube now.
I type: straight flame inner tube inside standard configuration, cannot enough volume smoking gas be mixed and burned, combustion intensity is violent, flame high temperature
Area is obvious, i.e., NOx generation amount is big；
U and W type: for improve the thermal efficiency research and development type, mostly the first curved segment and before be flame high-temperature region, be easy produce
Raw local heating, while U and W radiant tube overall length is bigger, is easy to produce internal stress, service life is not high.
Summary of the invention
To solve the above problems, the utility model provides a kind of flame inner tube and its radiant tube applied in radiant tube, energy
The advantages of combining the thermal efficiency, heating efficiency, service life and reducing the pollutant emissions such as NOx.
To achieve the above object, one of the technical solution adopted in the utility model: a kind of fire applied in radiant tube is provided
Flame inner tube, including interior tube body, inner tube body outer surface are evenly distributed with support chip, said inner tube ontology edge radially and axially
Its input end is sequentially provided with to the direction that outlet end extends shrinks pipeline section, straight pipe and expanded pipe section, wherein shrinking pipeline section
Caliber extends along direction and becomes smaller, and the caliber of straight pipe remains unchanged, and the caliber of expanded pipe section extends along direction increase, wherein
The maximum caliber for shrinking pipeline section is greater than the caliber of straight pipe, shrinks the input end at the maximum caliber of pipeline section for interior tube body.
Specifically, said inner tube ontology further includes extending pipeline section, and described one end for extending pipeline section is docked with expanded pipe section, and
The caliber for extending pipeline section increases along extending direction.
Specifically, the interlaced setting of support chip between different sagittal planes.
Specifically, the internal diameter of said inner tube ontology input end is twice of inside diameter of straight pipe section.
To achieve the above object, the two of the technical solution adopted in the utility model: a kind of spoke of built-in flame inner tube is provided
Pipe, including radiation tube body and interior tube body are penetrated,
Inner tube body outer surface is evenly distributed with support chip radially and axially, and said inner tube ontology is along its input end to out
The direction that mouth end extends, which is sequentially provided with, shrinks pipeline section, straight pipe and expanded pipe section, wherein the caliber for shrinking pipeline section extends along
Direction becomes smaller, and the caliber of straight pipe remains unchanged, and the caliber of expanded pipe section extends along direction increase, wherein shrinking pipeline section most
Large Diameter Pipeline is greater than the caliber of straight pipe, shrinks the input end at the maximum caliber of pipeline section for interior tube body；
The radiation tube body is the enclosed type radiant tube of single-ended import, and the radiant tube is two-way flow in same pipeline section,
Said inner tube ontology is arranged in radiant tube body, wherein shrinking pipeline section close to the input end of radiation tube body, expanded pipe section is far from spoke
Penetrate the input end of tube body, interior tube body is fixed in radiant tube body by support chip, radiant tube inner wall and flame inner tube into
There are exhaust gases passes between mouth end and outlet end outer, and it is last that radiation tube body is reached after making flue gas from radiation tube body into interior tube body
Reverse reflux again behind end, flows out through exhaust gases passes.
Specifically, the contour structures of the radiation tube body are to be extended continuously and the identical I type of internal diameter radiates tube body, moderate heat
Pipe end is equal to the internal diameter of radiation tube body to the distance of end part of radiant tube in flame.
To achieve the above object, the two of the technical solution adopted in the utility model: a kind of radiant tube of built-in flame inner tube,
Including radiating tube body and interior tube body,
Inner tube body outer surface is evenly distributed with support chip radially and axially, and said inner tube ontology is along its input end to out
The direction that mouth end extends, which is sequentially provided with, shrinks pipeline section, straight pipe and expanded pipe section, wherein the caliber for shrinking pipeline section extends along
Direction becomes smaller, and the caliber of straight pipe remains unchanged, and the caliber of expanded pipe section extends along direction increase, wherein shrinking pipeline section most
Large Diameter Pipeline is greater than the caliber of straight pipe, shrinks the input end at the maximum caliber of pipeline section for interior tube body；
The radiation tube body is that the enclosed type of single-ended import radiates tube body, and the radiant tube is one-way flow in same pipeline section
Dynamic, said inner tube ontology is arranged in radiant tube body, wherein shrinking pipeline section close to the input end of radiation tube body, expanded pipe section is separate
The input end of tube body is radiated, interior tube body is fixed in radiant tube body by support chip, and flame inner tube input end outer diameter is not less than
The internal diameter for radiating tube body, along the extending direction outflow of radiation tube body after making flue gas from radiation tube body into interior tube body.
Specifically, the contour structures of the radiation tube body are to be extended continuously and the identical p-type of internal diameter radiates tube body, the P
Type radiation tube body includes being extended continuously inlet tube and return pipe, and one end of return pipe is connected to form reflux with the side wall of inlet tube
Mouthful, the collapsible tube section of said inner tube ontology is located at the downside of refluxing opening, and flue gas is made to enter interior tube body from radiation tube body inlet tube
Afterwards, the return pipe extending direction along radiation tube body enters refluxing opening outflow.
Specifically, the return pipe is equipped with two or more.
Specifically, the internal diameter of the radiation tube body is greater than the outer diameter of interior tube body outlet end.
The utility model has the beneficial effects that:
The utility model by being provided with flame inner tube, flame inner tube along the direction that its input end extends to outlet end sequentially
It is provided with and shrinks pipeline section, straight pipe and expanded pipe section, the flue gas to burn in burner by shrinking pipeline section by being made after flame inner tube
High-speed flow injection periphery low speed flow, blends and transmits energy, forms injection area, then pass through straight pipe make injection air-flow with
It is mixed by injection air-flow and forms the equal pressure gas stream of average rate, finally reduce flow velocity by expanded pipe section, improve static pressure, flame inner tube is matched
Close single-ended import enclosed type radiation tube body apply from preheating burner after, can flow back inside smoke to greatest extent, with combustion gas and
After combustion air mixing, forms mixture and carry out more mild and combustion system more evenly, improve integral radiation pipe surface
Temperature uniformity.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of interior tube body；
Fig. 2 is the structural schematic diagram of embodiment two；
Fig. 3 is the structural schematic diagram of embodiment three.
Fig. 4 is another structural schematic diagram of embodiment three.
Specific embodiment
Embodiment one
Refering to Figure 1, the present embodiment is about a kind of flame inner tube applied in radiant tube, including interior tube body 6, it is interior
6 outer surface of tube body is evenly distributed with support chip 7 radially and axially, when interior tube body 6 be set to radiation tube body 5 in when from limit
With fixed effect, it is one group that 7 form of support chip, which includes but is not limited to radial, is distributed one or more supports 7, while axis
To distribution multiple groups support chip 7, in order to guarantee that interior tube body is not deformed by thermal stress etc., it is interspersed along axial two groups of support chips 7,
Such as first group is uniformly respectively 0 ° -90 ° -180 ° -270 °, then axial second group be uniformly exactly 45 ° -135 ° -225 ° -
315°。
Said inner tube ontology 6, which is sequentially provided with along its input end to the direction that outlet end extends, shrinks pipeline section 8, straight pipe 9
With expanded pipe section 10, wherein the caliber for shrinking pipeline section 8 extends along direction and becomes smaller, the caliber of straight pipe 9 is remained unchanged, extension tube
The caliber of section 10 extends along direction increase, wherein the maximum caliber for shrinking pipeline section 8 is greater than the caliber of straight pipe, shrinks pipeline section 8
Maximum caliber at be interior tube body 6 input end.After flue gas passes through interior tube body 6, draw high-speed flow by shrinking pipeline section 8
Periphery low speed flow is penetrated, energy is blended and transmit, forms injection area, then passing through straight pipe 9 makes injection air-flow and by injection gas
Stream mixes and forms the equal pressure gas stream of average rate, finally reduces flow velocity by expanded pipe section 10, improves static pressure, and flame inner tube 6 cooperates list
The enclosed type radiation tube body 5 of end import is applied from after preheating burner, and can flow back inside smoke to greatest extent, with combustion gas and combustion-supporting
After air mixing, forms mixture and carry out more mild and combustion system more evenly, improve the temperature of integral radiation pipe surface
Uniformity.
Further, in this embodiment said inner tube ontology 6 further includes extending pipeline section 11, described one end for extending pipeline section 11
It is docked with expanded pipe section 10, and the caliber for extending pipeline section 11 increases along extending direction, extends the expanded pipe section that pipeline section 11 is equivalent to
10 extension, reality is according to interior 6 application adjustment length of tube body or deletes, it is therefore an objective to preferably export expanded pipe section 11
Air-flow static pressure is equal or close near exit air-flow static pressure, and the temperature for further increasing 5 surface of integral radiation tube body is uniform
Property.
Further, in this embodiment the internal diameter of 6 input end of said inner tube ontology is twice of 9 internal diameter of straight pipe, it can be real
The optimal injection effect of tube body 6 in existing.
Embodiment two
It please refers to shown in Fig. 2, the present embodiment provides a kind of radiant tube of built-in flame inner tube, including radiation tube body 5 and interior
Tube body 6,
Interior tube body 6 is radiated the enclosed type that tube body 5 is single-ended import and is radiated tube body using the scheme in such as embodiment one
5, the radiation tube body 5 is two-way flow in same pipeline section, and the setting of said inner tube ontology 6 is radiating in tube body 5, wherein collapsible tube
Input end of the section 8 close to radiation tube body 5, input end of the expanded pipe section 10 far from radiation tube body 5, interior tube body 6 pass through support chip 7
It is fixed in radiation tube body 5, there are flue gases between radiation 5 inner wall of tube body and the inlet end and an outlet end outer of flame inner tube 6
Channel, make flue gas enter after interior tube body 6 from radiation tube body 5 reach radiation 5 end of tube body after reverse reflux again, through exhaust gases passes
Outflow.
In the present embodiment, the contour structures that use of radiation tube body 5 to be extended continuously and the identical I type radiation tube body of internal diameter,
Use of the cooperation from preheating burner.Specific working principle is as follows:
(1) since cold conditions or low temperature mode when, combustion gas by burner fuel gas inlet 2 enter burner 1, combustion air from
Air intlet 3 enter burner 1 after after heat exchanger is by smoke pre-heating with lighted after combustion gas mixing to be formed high-temperature combustion product into
Enter to radiate in the interior tube body 6 in tube body 5 that the reaction was continued, volume is inhaled portion flue gas and entered in combustion product in the process.?
When close to interior 6 outlet end of tube body, mix products are returned along the exhaust gases passes that both interior tube body 6 and radiation tube body 5 wall surface are formed
Stream, whole process enter 1 region of burner by the radiation external heat release of 5 wall surface of tube body later, and a part is inhaled by volume again, another part
By the heat exchanger warm-up combustion-supporting air of burner 1, then pass through 4 discharge burner 1 of smoke evacuation outlet.Interior tube body 6 is in injection type,
The more injection flue gas mixing of energy, makes integral combustion slow down and relents, increase flame burn area, reduce local high temperature zone,
Even temperature field and reduction NOx generation.
(2) at high temperature (discharge space temperature is greater than 850 DEG C), combustion gas and combustion air enter the path of burner 1
It is identical as (1), but without lighting, it is sprayed into after directly mixing in the interior tube body 6 in radiation tube body 5, while rolling up and inhaling a large amount of cigarettes
Gas is mixed, and is formed flameless combustion mode, so that combustion zone is almost full with space in this radiant tube, temperature is more equal
Even, NOx generation amount is less.
(3) radiation 5 internal temperature field of tube body more uniformly after, will not generate radiation 5 localized hyperthermia of tube body, there will not be office
Radiant tube service life can be effectively ensured in portion's thermal stress.
As preferably embodiment, wherein the distance of interior 6 end of tube body to radiation 5 end of tube body is equal to radiation tube body
5 internal diameter, when interior tube body 6 is longer, the distance of interior 6 end of tube body to radiation 5 end of tube body is smaller, outer side radiation tube body 5
Surface temperature more evenly, but flue gas radiate 5 end of tube body flow back when resistance it is bigger, present embodiment is temperature uniformity and pressure
The optimal value of damage.
Embodiment three
Please refer to shown in Fig. 3, the present embodiment and embodiment two the difference is that, tube body 5 is radiated in the present embodiment is
The enclosed type of single-ended import radiates tube body 5, and the radiation tube body 5 is one-way flow in same pipeline section, and said inner tube ontology 6 is arranged
Radiation tube body 5 in, wherein shrink pipeline section 8 close to radiation tube body 5 input end, expanded pipe section 10 far from radiation tube body 5 into
Mouth end, interior tube body 6 are fixed in radiation tube body 5 by support chip 7, and interior 6 input end outer diameter of tube body is not less than radiation tube body 5
Internal diameter, make flue gas from radiation tube body 5 enter interior tube body after along radiation tube body 5 extending direction outflow.
In the present embodiment, the contour structures of the radiation tube body 5 are to be extended continuously and the identical p-type of internal diameter radiates tube body,
The p-type radiation tube body 5 includes being extended continuously inlet tube 51 and return pipe 52, one end of return pipe 52 and the side wall of inlet tube 51
Connection forms refluxing opening 53, and the contraction pipeline section 8 of said inner tube ontology 6 is located at the downside of refluxing opening 53, makes flue gas from radiation tube body 5
After inlet tube enters interior tube body 6, enter the outflow of refluxing opening 53 along 52 extending direction of return pipe of radiation tube body 5.
Specific working principle is as follows:
(1) since cold conditions or low temperature mode when, combustion gas enters burner 1 by fuel gas inlet 2, and combustion air is from air
Import 3 enters after burner 1 to form high-temperature combustion product with being lighted after combustion gas mixing after heat exchanger is by smoke pre-heating and enter spoke
Inlet tube 51 in tube body 5 is penetrated, subsequently enters in interior tube body 6 that the reaction was continued, volume inhales portion flue gas and enters combustion in the process
It burns in product.When close to interior 6 another outlet end of tube body, it is mixed and burned product and is turned to along p-type radiation 5 return pipe 52 of tube body, so
After continue one-way flow, finally enter refluxing opening 53 outflow, whole process by radiation the external heat release of 5 wall surface of tube body, later enter burn
1 region of mouth is divided into two parts, and a part is inhaled by volume again, and another part passes through the heat exchanger warm-up combustion-supporting air of burner 1, then
Pass through 4 discharge burner 1 of smoke evacuation outlet.Interior tube body 6 is in injection type, and the more injection flue gas mixing of energy makes integral combustion slow down
It relents, increases flame burn area, reduce local high temperature zone, homogeneous temperature field and reduction NOx generation.
(2) at high temperature (discharge space temperature is greater than 850 DEG C), combustion gas and combustion air enter the path of burner 1
It is identical as (1), but without lighting, it is sprayed into after directly mixing in the interior tube body 6 in radiation tube body 5, while rolling up and inhaling a large amount of cigarettes
Gas is mixed, and is formed flameless combustion mode, so that combustion zone is almost full with space in this radiant tube body, temperature is more equal
Even, NOx generation amount is less.
(3) radiation 5 internal temperature field of tube body more uniformly after, radiant tube localized hyperthermia will not be generated, there will not be part
Radiant tube service life can be effectively ensured in thermal stress.
As preferably embodiment, return pipe 52 is equipped with two or more, is illustrated in figure 4 double-P type radiant tube body, is arranged
A plurality of return pipe helps to further increase the thermal efficiency.
As preferably embodiment, the internal diameter for radiating tube body 5 is greater than the outer diameter of interior 6 outlet end of tube body.Using above-mentioned
The effect of scheme is as follows: if first is that interior tube body 6 nearby has arrangement support chip 7 in outlet end, it is desirable that flow out certain gap；Second is that
Flue gas after allowing part to burn, which is connected to, to be but not passed through interior tube body 6 and radiates the space between tube body 5, this section of space is full of
Flue gas can 5 surface temperature of homogeneous radiation tube body, keep radiation temperature more uniform, at the same make this section radiation tube body 5 be avoided that this
Part high-low temperature difference, which generates thermal stress, when section space only has low-temperature airflow influences the service life.
Embodiment of above is only that preferred embodiments of the present invention are described, not to the utility model
Range be defined, under the premise of not departing from the spirit of the design of the utility model, this field ordinary engineering and technical personnel to this
The various changes and improvements that the technical solution of utility model is made should all fall into the guarantor that claims of the utility model determine
It protects in range.
Claims (10)
1. a kind of flame inner tube applied in radiant tube, which is characterized in that including interior tube body, inner tube body outer surface is radially
It is evenly distributed with support chip with axial, said inner tube ontology is sequentially provided with contraction to the direction that outlet end extends along its input end
Pipeline section, straight pipe and expanded pipe section, wherein the caliber for shrinking pipeline section extends along direction and becomes smaller, the caliber of straight pipe is kept not
Become, the caliber of expanded pipe section extends along direction increase, wherein the maximum caliber for shrinking pipeline section is greater than the caliber of straight pipe, shrinks
It is the input end of interior tube body at the maximum caliber of pipeline section.
2. a kind of flame inner tube applied in radiant tube according to claim 1, which is characterized in that said inner tube ontology is also
Including extending pipeline section, described one end for extending pipeline section is docked with expanded pipe section, and the caliber for extending pipeline section increases along extending direction.
3. a kind of flame inner tube applied in radiant tube according to claim 2, which is characterized in that it is flat to be located at different radial directions
The interlaced setting of support chip between face.
4. a kind of flame inner tube applied in radiant tube according to claim 1-3, which is characterized in that in described
The internal diameter of tube body input end is twice of inside diameter of straight pipe section.
5. a kind of radiant tube of built-in flame inner tube, which is characterized in that including radiating tube body and interior tube body,
Inner tube body outer surface is evenly distributed with support chip radially and axially, and said inner tube ontology is along its input end to outlet end
The direction of extension, which is sequentially provided with, shrinks pipeline section, straight pipe and expanded pipe section, wherein the caliber for shrinking pipeline section extends along direction
Become smaller, the caliber of straight pipe remains unchanged, and the caliber of expanded pipe section extends along direction increase, wherein shrinking the largest tube of pipeline section
Diameter is greater than the caliber of straight pipe, shrinks the input end at the maximum caliber of pipeline section for interior tube body；
The radiation tube body is the enclosed type radiant tube of single-ended import, and the radiant tube is two-way flow in same pipeline section, described
Interior tube body is arranged in radiant tube body, wherein shrinking pipeline section close to the input end of radiation tube body, expanded pipe section is far from radiant tube
The input end of body, interior tube body are fixed in radiant tube body by support chip, the input end of radiant tube inner wall and flame inner tube
There are exhaust gases passes between the outer of outlet end, enter flue gas after interior tube body behind arrival radiation tube body end from radiation tube body
Reverse reflux again is flowed out through exhaust gases passes.
6. the radiant tube of built-in flame inner tube according to claim 5, which is characterized in that the shape knot of the radiation tube body
Structure is to be extended continuously and the identical I type of internal diameter radiates tube body, and the distance of Flame inner tube end to end part of radiant tube is equal to spoke
Penetrate the internal diameter of tube body.
7. a kind of radiant tube of built-in flame inner tube, which is characterized in that including radiating tube body and interior tube body,
Tube body outer surface is evenly distributed with support chip radially and axially, and said inner tube ontology prolongs along its input end to outlet end
The direction stretched, which is sequentially provided with, shrinks pipeline section, straight pipe and expanded pipe section, wherein the caliber for shrinking pipeline section extends along direction change
Small, the caliber of straight pipe remains unchanged, and the caliber of expanded pipe section extends along direction increase, wherein shrinking the maximum caliber of pipeline section
Greater than the caliber of straight pipe, the input end at the maximum caliber of pipeline section for interior tube body is shunk；
The radiation tube body is that the enclosed type of single-ended import radiates tube body, and the radiant tube is one-way flow, institute in same pipeline section
It states interior tube body to be arranged in radiant tube body, wherein shrinking pipeline section close to the input end of radiation tube body, expanded pipe section is far from radiation
The input end of tube body, interior tube body are fixed in radiant tube body by support chip, and flame inner tube input end outer diameter is not less than radiation
The internal diameter of tube body, along the extending direction outflow of radiation tube body after making flue gas from radiation tube body into interior tube body.
8. the radiant tube of built-in flame inner tube according to claim 7, which is characterized in that the shape knot of the radiation tube body
Structure is to be extended continuously and the identical p-type of internal diameter radiates tube body, and the p-type radiation tube body includes the inlet tube being extended continuously and reflux
Pipe, one end of return pipe are connected to form refluxing opening with the side wall of inlet tube, and the collapsible tube section of said inner tube ontology is located at refluxing opening
Downside, make flue gas from radiation tube body inlet tube enter interior tube body after, along radiation tube body return pipe extending direction enter back
Head piece outflow.
9. the radiant tube of built-in flame inner tube according to claim 8, which is characterized in that the return pipe be equipped with two with
On.
10. according to the radiant tube of the described in any item built-in flame inner tubes of claim 7-9, which is characterized in that the radiant tube
The internal diameter of body is greater than the outer diameter of interior tube body outlet end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822062457.1U CN209180946U (en) | 2018-12-08 | 2018-12-08 | A kind of flame inner tube and its radiant tube applied in radiant tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822062457.1U CN209180946U (en) | 2018-12-08 | 2018-12-08 | A kind of flame inner tube and its radiant tube applied in radiant tube |
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| Publication Number | Publication Date |
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| CN209180946U true CN209180946U (en) | 2019-07-30 |
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ID=67376246
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| CN201822062457.1U Active CN209180946U (en) | 2018-12-08 | 2018-12-08 | A kind of flame inner tube and its radiant tube applied in radiant tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404913A (en) * | 2018-12-08 | 2019-03-01 | 佛山市科皓燃烧设备制造有限公司 | A kind of flame inner tube and its radiant tube applied in radiant tube |
-
2018
- 2018-12-08 CN CN201822062457.1U patent/CN209180946U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404913A (en) * | 2018-12-08 | 2019-03-01 | 佛山市科皓燃烧设备制造有限公司 | A kind of flame inner tube and its radiant tube applied in radiant tube |
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