CN204730237U - The flow-guiding structure of air preheater smoke inlet - Google Patents
The flow-guiding structure of air preheater smoke inlet Download PDFInfo
- Publication number
- CN204730237U CN204730237U CN201520465336.5U CN201520465336U CN204730237U CN 204730237 U CN204730237 U CN 204730237U CN 201520465336 U CN201520465336 U CN 201520465336U CN 204730237 U CN204730237 U CN 204730237U
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- CN
- China
- Prior art keywords
- deflector
- hemispherical dome
- flow
- air preheater
- flue gas
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- 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.)
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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 belongs to air preheater field, be specifically related to a kind of flow-guiding structure of air preheater smoke inlet, comprise the exhaust gases passes be made up of flue gas cylinder interface, hemispherical dome, preheater rectangular interface, open deflector is installed in hemispherical dome.Open deflector is made up of some deflectors, and deflector is made up of vertical straight flange Drainage Section and arc diversion section from top to bottom; The upper end of each straight flange Drainage Section is positioned at same level; Upper end and the straight flange Drainage Section of arc diversion section are tangent, and lower end bends to the wall direction of hemispherical dome.Flue gas can be divided into some parts by the straight flange Drainage Section of open deflector, and by arc diversion section, flue gas is guided to uniformly the wall area of close hemispherical dome, reduce the gas that causes because flow area is excessive of flue gas and the break-off on hemispherical dome surface and the eddy current of generation thereof, achieve being uniformly distributed of flue gas, reduce flue gas resistance loss.
Description
Technical field
The utility model relates to a kind of flow-guiding structure of air preheater smoke inlet, belongs to air preheater field.
Background technology
In plumbing arrangements manufacturing technology, the coupling part of square tube and pipe is called circumference reducer pipe, also known as " hemispherical dome ", hemispherical dome is generally made up of four triangular surfaces (or planar delta) and four conical cambers, has been widely used in the airduct of circle cross section and rectangular cross section or the connection of equipment room at present.
Air preheater is used for Mist heat recovering, is typical energy-saving environmental protection device, has the features such as heat transfer efficiency is high, high temperature resistant, compact conformation, thus have wide application prospect in fields such as petrochemical industry, metallurgy, thermal power generation.Heating furnace burning produces flue gas by after economizer, and flue-gas temperature, at about 250 ~ 350 DEG C, usually adopt round pipe smoke evacuation, and air preheater smoke inlet adopts rectangular channel, and both need to adopt hemispherical dome variable-diameter structure.Because reducing height is large compared with little, reducing area, flue gas, in less reducing height, can not realize being uniformly distributed.Found by fluid simulation analysis, flue gas flow rate is at heat exchanger central area undue concentration, and other region flue gas flow rates are very little, thus have a strong impact on the heat transfer coefficient of air preheater; Flue gas flow rate inequality more easily causes the low-temperature dew point corrosion of wall.
When flue gas flows through hemispherical dome parts from circle smoke discharging pipe, flue gas overflow section becomes suddenly large, and violent turbulent closure scheme occurs in flowing.Flue gas flows through hemispherical dome cross section and expands, flue gas flow rate reduces, the positive gradient of pressure is produced along hemispherical dome length direction, be separated from tube wall in its effect boundary layer, produce whirlpool district, the generation of whirlpool needs to consume mechanical energy, and division and mutual collision, the friction of the flue gas in whirlpool can consume more mechanical energy.Simultaneously due to the flip-flop of cross sectional shape, cause flue gas uneven in hemispherical dome exit distribution of gas, the tolerance flowing into each channel interior is different, and namely each passage exists thermal deviation.The existence of thermal deviation can cause each passage heat transfer coefficient different, has a strong impact on the heat exchange efficiency of preheater; In the region that flue gas gas speed is lower, channel wall temperature is too low, especially easily causes cold end corrosion phenomenon.
For improving the hemispherical dome exiting flue gas uniformity, conventional method increases hemispherical dome height or reduces angle of flare, but these two kinds of methods are all subject to the restriction of preheater erecting bed condition, and fundamentally can not solve the uneven problem of distribution of gas.
Publication number is disclose a kind of flow-guiding structure in the patent of CN104197771A, open type increaser in this flow-guiding structure is made up of Drainage Section and diversion section, gas is divided into some parts by designing requirement design by Drainage Section, and diversion section is by the regional being guided to square chest of gas uniform.In this patent diversion section, the dorsal area of deflector is easy to form whirlpool, thus affects the distribution of gas in hemispherical dome exit.
Utility model content
According to above deficiency of the prior art, the technical problems to be solved in the utility model is: provide a kind of can to flue gas carry out water conservancy diversion and uniform, realize flue gas being uniformly distributed and reducing the flow-guiding structure of air preheater smoke inlet of flue gas resistance loss at hemispherical dome rectangular outlet.
The flow-guiding structure of air preheater smoke inlet described in the utility model, comprises the exhaust gases passes be made up of flue gas cylinder interface, hemispherical dome, preheater rectangular interface, is provided with open deflector in hemispherical dome.
Above-mentioned open deflector is made up of some deflectors, and the two ends of deflector are welded on the inwall of hemispherical dome, and the deflector in open deflector is symmetrically distributed.Deflector is made up of vertical straight flange Drainage Section and arc diversion section from top to bottom; The upper end of each straight flange Drainage Section is positioned at same level; Upper end and the straight flange Drainage Section of arc diversion section are tangent, and lower end bends to the wall direction of hemispherical dome.Flue gas is divided into some parts by straight flange Drainage Section, flue gas is guided to the wall area near hemispherical dome by arc diversion section uniformly, reduce the gas that causes because flow area is excessive of flue gas and the break-off on hemispherical dome surface and the eddy current of generation thereof, flue gas is guided to preheater rectangular interface the most at last, thus solves the technical problems such as the fluid existed when flue gas flows through hemispherical dome parts is uneven, pressure drop is large.
In the utility model, the height of deflector is 0.5 ~ 0.9 of hemispherical dome height; Preferred 6mm ~ the 20mm of thickness of deflector.Inside from outermost two deflectors, the spacing between adjacent baffle increases gradually and the straight flange Drainage Section height of each deflector becomes arithmetic progression; The straight flange Drainage Section height being positioned at outermost two deflectors is 0.15 ~ 0.2 of hemispherical dome height.
If the radius of the arc of the crooked radian of arc diversion section or arc diversion section is too small, flue gas even distribution effectiveness comparison can be caused poor, form flue gas low regime in the both sides of hemispherical dome; Otherwise both sides gas speed is excessive, central area gas speed is too low, form eddy current, cause gas speed inequality, drag losses increase.In the utility model, the radius of the arc of each deflector arc diversion section is equal; Inside from outermost two deflectors, the central angle of the arc of each deflector arc diversion section becomes arithmetic progression; The central angle of the arc of arc diversion section is 30 ° ~ 90 °.By adopting above-mentioned deflector, can uniform flue gas at the gas velocity distribution of hemispherical dome structure, reduce internal vortex, reduce the low-temperature dew point corrosion generation area of air preheater, ensure the Effec-tive Function of air preheater.
The beneficial effect that the utility model is compared with prior art had is:
In this flow-guiding structure, flue gas can be divided into some parts by the straight flange Drainage Section of open deflector, and by arc diversion section, flue gas is guided to uniformly the wall area of close hemispherical dome, reduce the gas that causes because flow area is excessive of flue gas and the break-off on hemispherical dome surface and the eddy current of generation thereof, achieve being uniformly distributed of flue gas, reduce flue gas resistance loss, flue gas is guided to preheater rectangular interface the most at last.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the top view of Fig. 1.
In figure: 1, flue gas cylinder interface; 2, straight flange Drainage Section; 3, arc diversion section; 4, flange; 5, hemispherical dome; 6, preheater rectangular interface.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further:
As shown in Figure 1, 2, the flow-guiding structure of this air preheater smoke inlet, comprise the exhaust gases passes be made up of flue gas cylinder interface 1, hemispherical dome 5, preheater rectangular interface 6, in hemispherical dome 5, open deflector is installed, for the ease of the smoke inlet rectangular channel of this flow-guiding structure with circle smoke discharging pipe and air preheater is connected, flange 4 is set in the outer rim of flue gas cylinder interface 1, preheater rectangular interface 6, is realized the Fast Installation of flow-guiding structure by flange 4.
Above-mentioned open deflector is made up of some deflectors, the two ends of deflector are welded on the inwall of hemispherical dome 5, namely, on the triangular surface (or planar delta) being welded on hemispherical dome 5 and conical camber, the deflector in open deflector is symmetrically distributed.Wherein, deflector is formed by vertical straight flange Drainage Section 2 and arc diversion section 3 assembly welding from top to bottom, and straight flange Drainage Section 2 is rectangle steel plate, and arc diversion section 3 is curved plate; The upper end of each straight flange Drainage Section 2 is positioned at same level; Upper end and the straight flange Drainage Section 2 of arc diversion section 3 are tangent, and lower end bends to the wall direction of hemispherical dome 5.Flue gas is divided into some parts by straight flange Drainage Section 2, flue gas is guided to the wall area near hemispherical dome 5 by arc diversion section 3 uniformly, reduce the gas that causes because flow area is excessive of flue gas and the break-off on hemispherical dome 5 surface and the eddy current of generation thereof, flue gas is guided to preheater rectangular interface 6 the most at last, thus solves the technical problems such as the fluid existed when flue gas flows through hemispherical dome 5 parts is uneven, pressure drop is large.
In the utility model, hemispherical dome 5 is highly about 500mm ~ 800mm, the straight flange Drainage Section 2 being positioned at outermost two deflectors is highly 0.15 ~ 0.2 of hemispherical dome 5 height, inside from outermost two deflectors, spacing between adjacent baffle increases gradually and the straight flange Drainage Section 2 of each deflector highly becomes arithmetic progression, and tolerance depends on flue gas gas speed and deflector quantity.The height of deflector is 0.5 ~ 0.9 of hemispherical dome 5 height; Preferred 6mm ~ the 20mm of thickness of deflector.
If the radius of the arc of the crooked radian of arc diversion section 3 or arc diversion section 3 is too small, flue gas even distribution effectiveness comparison can be caused poor, form flue gas low regime in the both sides of hemispherical dome 5; Otherwise both sides gas speed is excessive, central area gas speed is too low, form eddy current, cause gas speed inequality, drag losses increase.In the utility model, the radius of the arc of each deflector arc diversion section 3 is equal, and this radius is 0.2 of hemispherical dome 5 height; Inside from outermost two deflectors, the central angle of the arc of each deflector arc diversion section 3 becomes arithmetic progression; The central angle of the arc of arc diversion section 3 is 30 ° ~ 90 °.By adopting above-mentioned deflector, can uniform flue gas at the gas velocity distribution of hemispherical dome 5 structure, reduce internal vortex, reduce the low-temperature dew point corrosion generation area of air preheater, ensure the Effec-tive Function of air preheater.Tested by field experiment, in the exit of hemispherical dome 5 structure of interpolation deflector, gas unevenness M
fbe down to 0.6 from 3, resistance drop reduces about 20Pa, and the whole efficiency of air preheater improves 5 ~ 10%.
Claims (10)
1. the flow-guiding structure of an air preheater smoke inlet, comprise the exhaust gases passes be made up of flue gas cylinder interface (1), hemispherical dome (5), preheater rectangular interface (6), it is characterized in that: hemispherical dome is provided with open deflector in (5).
2. the flow-guiding structure of air preheater smoke inlet according to claim 1, it is characterized in that: described open deflector is made up of some deflectors, the two ends of deflector are welded on the inwall of hemispherical dome (5), and the deflector in open deflector is symmetrically distributed.
3. the flow-guiding structure of air preheater smoke inlet according to claim 1, is characterized in that: described deflector is made up of vertical straight flange Drainage Section (2) and arc diversion section (3) from top to bottom; The upper end of each straight flange Drainage Section (2) is positioned at same level; Upper end and straight flange Drainage Section (2) of arc diversion section (3) are tangent, and lower end bends to the wall direction of hemispherical dome (5).
4. the flow-guiding structure of air preheater smoke inlet according to claim 3, it is characterized in that: inside from outermost two deflectors, the spacing between adjacent baffle increases gradually and the straight flange Drainage Section (2) of each deflector highly becomes arithmetic progression.
5. the flow-guiding structure of the air preheater smoke inlet according to claim 3 or 4, is characterized in that: the straight flange Drainage Section (2) being positioned at outermost two deflectors is highly 0.15 ~ 0.2 of hemispherical dome (5) height.
6. the flow-guiding structure of the air preheater smoke inlet according to claim 3 or 4, is characterized in that: the radius of the arc of described each deflector arc diversion section (3) is equal.
7. the flow-guiding structure of air preheater smoke inlet according to claim 6, is characterized in that: inside from outermost two deflectors, the central angle of the arc of each deflector arc diversion section (3) becomes arithmetic progression.
8. the flow-guiding structure of the air preheater smoke inlet according to claim 3,4 or 7, is characterized in that: the central angle of the arc of described arc diversion section (3) is 30 ° ~ 90 °.
9. according to the flow-guiding structure of the arbitrary described air preheater smoke inlet of Claims 1 to 4, it is characterized in that: the height of described deflector is 0.5 ~ 0.9 of hemispherical dome (5) height.
10., according to the flow-guiding structure of the arbitrary described air preheater smoke inlet of claim 2 ~ 4, it is characterized in that: the thickness of described deflector is 6mm ~ 20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520465336.5U CN204730237U (en) | 2015-06-30 | 2015-06-30 | The flow-guiding structure of air preheater smoke inlet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520465336.5U CN204730237U (en) | 2015-06-30 | 2015-06-30 | The flow-guiding structure of air preheater smoke inlet |
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| Publication Number | Publication Date |
|---|---|
| CN204730237U true CN204730237U (en) | 2015-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520465336.5U Expired - Fee Related CN204730237U (en) | 2015-06-30 | 2015-06-30 | The flow-guiding structure of air preheater smoke inlet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104930540A (en) * | 2015-06-30 | 2015-09-23 | 山东旺泰科技有限公司 | Diversion structure of smoke inlet of air preheater |
-
2015
- 2015-06-30 CN CN201520465336.5U patent/CN204730237U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104930540A (en) * | 2015-06-30 | 2015-09-23 | 山东旺泰科技有限公司 | Diversion structure of smoke inlet of air preheater |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151028 Termination date: 20180630 |