CN2137327Y - Heat conductive tubular air preheater reinforced by helical coil - Google Patents
Heat conductive tubular air preheater reinforced by helical coil Download PDFInfo
- Publication number
- CN2137327Y CN2137327Y CN92213724U CN92213724U CN2137327Y CN 2137327 Y CN2137327 Y CN 2137327Y CN 92213724 U CN92213724 U CN 92213724U CN 92213724 U CN92213724 U CN 92213724U CN 2137327 Y CN2137327 Y CN 2137327Y
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- CN
- China
- Prior art keywords
- air preheater
- spiral winding
- tubular air
- reinforced
- heat conductive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model relates to a heat conductive tubular air preheater reinforced by a helical coil, belonging to the technical field of a heat exchanging apparatus, and the heat conductive tubular air preheater reinforced by a helical coil is the improvement of the air preheater which is usually used. The essential proposal is that the spiral coil with definite structure size is inserted into the hollow tube of the air preheater, the liquid flowing across the tube can be sufficiently disturbed in order to efficiently increase the heat-exchange rate of the air preheater, reduce the thermal loss of fume exhaust, increase hot air temperature, improve combustion, reduce the coal consumption of a boiler, and enhance the anti-ash deposition effect of the air preheater simultaneously. The utility model used for newly designed air preheater can save steel and flue space.
Description
The utility model is a kind of improvement to tubular air preheater, belongs to the technical field of heat-exchange apparatus.
Air preheater is used existing very long history in the apparatus field of heat exchange, especially tubular air preheater is used very extensive aspect boiler draft and waste heat recovery, but up to the present, all kinds of tubular air preheaters, except that aspect profile and size, changing to some extent, portion's configuration aspects does not all have the change of essence within it, so the efficient of its heat exchange does not significantly improve yet.Usually, in order to improve the efficient of heat exchange, just set about from the heat exchange area that increases pipe, therefrom the consequence of Chan Shenging be equipment not only greatly but also weigh.
Goal of the invention of the present utility model just provides a kind of heat exchanger effectiveness height, and does not increase the spiral winding augmentation of heat transfer tubular air preheater of equipment volume again.
Spiral winding augmentation of heat transfer tubular air preheater of the present utility model adopts the breather pipe in the spiral winding insertion tubular air preheater, spiral winding abuts against on the tube inner wall substantially, it is the inside diameter D that the external diameter of spiral winding equals hollow pipe, in the tubular air preheater of 70 millimeters of φ 40～φ, insert the spiral winding in the pipe, its pitch P is P/D=0.315～4.094 with the ratio of the outer diameter D of spiral winding, and the line footpath d of spiral winding is d/D=0.033～0.157 with the ratio of the outer diameter D of spiral winding.When the line cross section of spiral winding is rectangle, ratio h/D=0.033～0.157 of the height h of its rectangle and the outer diameter D of spiral winding, ratio P/D=0.315～4.094 of its pitch P and outer diameter D.
Advantage of the present utility model is to adopt spiral winding to insert augmentation of heat transfer in the pipe, make convection transfer rate raising 60～170% in the pipe, the respective flow resistance coefficient increases by 85～720%, according to the capacity usage ratio evaluation, can improve the heat exchange efficiency of heat exchanger greatly.In normal optical slip pipe formula heat exchanger, inside pipe wall face near zone often exists flow velocity to be significantly less than the laminar boundary layer of turbulent core space, and as calculated, the boundary layer thickness of flow velocity＜0.5m/s is about 1.2～4.0mm.Adopt the spiral winding augmentation of heat transfer, increase the pulsation degree that flows a molecule in interior tangential component of rotating of pipe and the pipe, destroy the laminar boundary layer at tube wall place, reduce heat transfer resistance, improved the intraductal heat exchange coefficient.In addition, the increase of disturbance degree in the pipe more helps anti-dust stratification in the pipe.Through actual measurement, present technique is used on the tubular air preheater of grate furnace, coal-powder boiler, has reduced by 10 ℃～17 ℃ of exhaust gas temperatures, has reduced heat loss due to exhaust gas; Improve 12 ℃～25 ℃ of hot blast temperatures, improved the stove internal combustion; Reduce the coa consumption rate of boiler, improved the performance of anti-dust stratification in the pipe.
Fig. 1 is the structural representation that spiral winding of the present utility model inserts hollow pipe.
Fig. 2 is after spiral winding inserts hollow pipe, the cross-sectional view of a certain heat-exchange tube.
Fig. 3 is the cross-sectional view when the line cross section of spiral winding is rectangle.
Fig. 4 is the structural representation of whole air preheater.
Embodiment of the present utility model is as follows:
Adopt metal wire rod, its cross section is all passable of circle or rectangle, with its coiled coil on pole, the external diameter of its coil equals the internal diameter of air preheater hollow pipe, then pole is extracted out, again that coiling is good coil inserts in the hollow pipe of air preheater, the head bending of coil, colludes on the end plate of air preheater and gets final product.Decide according to the internal diameter of air preheater hollow pipe in the line of coil footpath, i.e. line ratio d/D=0.033～0.157 of d and the external diameter of spiral winding directly, ratio P/D=0.315～4.094 of pitch P and coil outer diameter.According to the above, just can be made into spiral winding augmentation of heat transfer tubular air preheater of the present utility model.
Claims (3)
1, a kind of tubular air preheater is made up of some pipes and end plate (3), it is characterized in that having inserted spiral winding (1) in the pipe (2), and the external diameter of spiral winding (1) is the internal diameter of pipe (2).
2, spiral winding augmentation of heat transfer tubular air preheater according to claim 1, it is characterized in that in the tubular air preheater of 70 millimeters of φ 40～φ, insert the spiral winding (1) of hollow pipe (2), its pitch P is P/D=0.315～4.094 with the ratio of the outer diameter D of spiral winding, and the line footpath d of spiral winding is d/D=0.033～0.157 with the ratio of the outer diameter D of spiral winding.
3, spiral winding augmentation of heat transfer tubular air preheater according to claim 2, when the line cross section that it is characterized in that main spiral winding (1) is rectangle, ratio h/D=0.033～0.157 of its height h and the outer diameter D of spiral winding, ratio P/D=0.315～4.094 of its pitch P and outer diameter D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92213724U CN2137327Y (en) | 1992-04-29 | 1992-04-29 | Heat conductive tubular air preheater reinforced by helical coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92213724U CN2137327Y (en) | 1992-04-29 | 1992-04-29 | Heat conductive tubular air preheater reinforced by helical coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2137327Y true CN2137327Y (en) | 1993-06-30 |
Family
ID=33763593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92213724U Expired - Lifetime CN2137327Y (en) | 1992-04-29 | 1992-04-29 | Heat conductive tubular air preheater reinforced by helical coil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2137327Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728579A (en) * | 2021-01-14 | 2021-04-30 | 湘潭大学 | High-efficient air heater with deashing and anticorrosion function |
-
1992
- 1992-04-29 CN CN92213724U patent/CN2137327Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728579A (en) * | 2021-01-14 | 2021-04-30 | 湘潭大学 | High-efficient air heater with deashing and anticorrosion function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |