CN104930540B - The flow-guiding structure of air preheater smoke inlet - Google Patents
The flow-guiding structure of air preheater smoke inlet Download PDFInfo
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- CN104930540B CN104930540B CN201510378609.7A CN201510378609A CN104930540B CN 104930540 B CN104930540 B CN 104930540B CN 201510378609 A CN201510378609 A CN 201510378609A CN 104930540 B CN104930540 B CN 104930540B
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- Prior art keywords
- deflector
- hemispherical dome
- flow
- air preheater
- flue gas
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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
Abstract
The invention belongs to air preheater field, and in particular to be provided with open deflector in a kind of flow-guiding structure of air preheater smoke inlet, including the exhaust gases passes being made up of flue gas cylinder interface, hemispherical dome, preheater rectangular interface, 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 located at same level；The upper end of arc diversion section and straight flange Drainage Section are tangent, and lower end is bent to the wall direction of hemispherical dome.Flue gas can be divided into by several pieces by the straight flange Drainage Section of open deflector, and flue gas is uniformly guided to close to the wall area of hemispherical dome by arc diversion section, reduce gas and the break-off and its vortex of generation on hemispherical dome surface that flue gas is caused because flow area is excessive, being uniformly distributed for flue gas is realized, flue gas resistance loss is reduced.
Description
Technical field
The present invention relates to a kind of flow-guiding structure of air preheater smoke inlet, belong to air preheater field.
Background technology
In plumbing arrangements manufacturing technology, the coupling part of square tube and pipe is referred to as having an area of reducer pipe, and also known as " day is circularly
Side ", hemispherical dome is typically made up of four triangular surfaces (or planar delta) and four conical cambers, is widely used at present
The connection of the airduct or equipment room of circle cross section and rectangular cross section.
Air preheater is used for Mist heat recovering, is typical energy-saving environmental protection device, with heat transfer efficiency is high, resistance to height
The features such as temperature, compact conformation, thus there is wide application prospect in fields such as petrochemical industry, metallurgy, thermal power generation.Heating furnace fires
Burn after producing flue gas by economizer, flue-gas temperature is at 250~350 DEG C or so, generally using round pipe smoke evacuation, and air preheat
Device smoke inlet uses rectangular channel, and both need to use hemispherical dome variable-diameter structure.Due to smaller, the reducing area of reducing height
Greatly, flue gas is in less reducing height, it is impossible to which realization is uniformly distributed.Found by fluid emulation analysis, flue gas flow rate is being changed
Hot device central area undue concentration, other region flue gas flow rates are very small, so as to have a strong impact on the heat transfer coefficient of air preheater；
Flue gas flow rate inequality is easier to cause the low-temperature dew point corrosion of wall.
When flue gas flows through hemispherical dome part from circle smoke discharging pipe, flue gas overflow section becomes big suddenly, and flowing occurs acute
Strong turbulent closure scheme.Flue gas flows through the expansion of hemispherical dome cross section, and flue gas flow rate reduction produces pressure along hemispherical dome length direction
The positive gradient of power, acts on boundary layer at it and is separated from tube wall, produces whirlpool area, and the generation of whirlpool needs to consume mechanical energy, whirlpool
The division of flue gas in whirlpool and mutually collision, friction can consume more mechanical energy.Simultaneously because the suddenly change of cross sectional shape,
Cause flue gas in hemispherical dome exit gas skewness, the tolerance for flowing into each channel interior is different, i.e., each passage has heat
Deviation.The presence of thermal deviation can cause each passage heat transfer coefficient different, have a strong impact on the heat exchange efficiency of preheater；In flue gas gas velocity
Relatively low region, channel wall temperature is too low, is particularly easy to cause low-temperature corrosion phenomenon.
To improve the hemispherical dome exiting flue gas uniformity, conventional method is increase hemispherical dome height or reduces angle of flare,
But both approaches are limited by preheater erecting bed condition, and it is pockety fundamentally to solve gas
Problem.
A kind of flow-guiding structure is disclosed in Publication No. CN104197771A patent, the open type flaring in the flow-guiding structure
Pipe is made up of Drainage Section and diversion section, and gas is divided into several pieces by Drainage Section by design requirement design, and diversion section is equal by gas
The even regional for being guided to square chest.In the patent diversion section, the dorsal area of deflector is readily formed whirlpool, so that shadow
Ring the gas distribution in hemispherical dome exit.
The content of the invention
According to deficiency of the prior art above, the technical problem to be solved in the present invention is：There is provided one kind can be to flue gas
Carry out water conservancy diversion and it is uniform, realize flue gas hemispherical dome rectangular outlet to be uniformly distributed and reduce the air that flue gas resistance loses pre-
The flow-guiding structure of hot device smoke inlet.
The flow-guiding structure of air preheater smoke inlet of the present invention, including by flue gas cylinder interface, hemispherical dome,
Open deflector is installed in the exhaust gases passes of preheater rectangular interface composition, hemispherical dome.
Above-mentioned open deflector is made up of some deflectors, and the two ends of deflector are welded on the interior of hemispherical dome
On wall, the deflector in open deflector is symmetrically distributed.Deflector from top to bottom by vertical straight flange Drainage Section and
Arc diversion section is constituted；The upper end of each straight flange Drainage Section is located at same level；The upper end of arc diversion section and straight flange Drainage Section
Tangent, lower end is bent to the wall direction of hemispherical dome.Flue gas is divided into several pieces by straight flange Drainage Section, and arc diversion section is by cigarette
Gas is uniformly guided to close to the wall area of hemispherical dome, reduces gas and day circle that flue gas is caused because flow area is excessive
The break-off on local surface and its vortex of generation, most flue gas is guided to preheater rectangular interface at last, so as to solve cigarette
The technical problem such as the fluid that exists when air-flow is through hemispherical dome part is uneven, pressure drop is big.
In the present invention, the height of deflector is the 0.5~0.9 of hemispherical dome height；The preferred 6mm of thickness of deflector
~20mm.From outermost two deflector inwardly, the spacing between adjacent baffle gradually increases and the straight flange of each deflector draws
Section height is flowed into arithmetic progression；Positioned at the straight flange Drainage Section of outermost two deflector highly for hemispherical dome height 0.15~
0.2。
If the radius of the crooked radian of arc diversion section or the arc of arc diversion section is too small, flue gas even distribution can be caused to imitate
It is really poor, form flue gas low regime in the both sides of hemispherical dome；Conversely, both sides gas velocity is excessive, central area gas velocity is too low, shape
Into vortex, gas velocity inequality, drag losses increase are caused.In the present invention, the radius of the arc of each deflector arc diversion section is equal；
From outermost two deflector inwardly, the central angle of the arc of each deflector arc diversion section is into arithmetic progression；Arc diversion section
The central angle of arc is 30 °~90 °.By using above-mentioned deflector, can uniformly flue gas hemispherical dome structure gas velocity distribution,
Reduce internal vortex, reduce the low-temperature dew point corrosion generation area of air preheater, it is ensured that the Effec-tive Function of air preheater.
The present invention is had an advantageous effect in that compared with prior art：
In this flow-guiding structure, flue gas can be divided into by several pieces by the straight flange Drainage Section of open deflector,
And flue gas is uniformly guided to close to the wall area of hemispherical dome by arc diversion section, reduce flue gas due to flow area
The excessive gas caused and the break-off and its vortex of generation on hemispherical dome surface, realize being uniformly distributed for flue gas, drop
Low flue gas resistance loss, most flue gas is guided to preheater rectangular interface at last.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is Fig. 1 top view.
In figure：1st, flue gas cylinder interface；2nd, straight flange Drainage Section；3rd, arc diversion section；4th, flange；5th, hemispherical dome；6th, it is pre-
Hot device rectangular interface.
Embodiment
Embodiments of the invention are described further below in conjunction with the accompanying drawings：
As shown in Figure 1, 2, the flow-guiding structure of this air preheater smoke inlet, including by flue gas cylinder interface 1, day circularly
Open deflector is installed in the exhaust gases passes that side 5, preheater rectangular interface 6 are constituted, hemispherical dome 5, for the ease of
This flow-guiding structure is connected with the smoke inlet rectangular channel of circle smoke discharging pipe and air preheater, in flue gas cylinder interface 1, in advance
The outer rim of hot device rectangular interface 6 sets flange 4, and the Fast Installation of flow-guiding structure is realized by flange 4.
Above-mentioned open deflector is made up of some deflectors, and the two ends of deflector are welded on hemispherical dome 5
On inwall, that is, it is welded on the triangular surface of hemispherical dome 5 (or planar delta) and conical camber, in open deflector
Deflector be symmetrically distributed.Wherein, deflector from top to bottom by the 3 groups of welderings in vertical straight flange Drainage Section 2 and arc diversion section and
Into 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 located at same
Horizontal plane；The upper end of arc diversion section 3 and straight flange Drainage Section 2 are tangent, and lower end is bent to the wall direction of hemispherical dome 5.Straight flange
Flue gas is divided into several pieces by Drainage Section 2, and flue gas is uniformly guided to the wall region close to hemispherical dome 5 by arc diversion section 3
Domain, reduces gas and the break-off and its vortex of generation on the surface of hemispherical dome 5 that flue gas is caused because flow area is excessive,
Most flue gas is guided to preheater rectangular interface 6 at last, so that solving flue gas flows through the fluid existed during 5 part of hemispherical dome not
The technical problem such as, pressure drop is big.
In the present invention, the height of hemispherical dome 5 is 500mm~800mm or so, and the straight flange positioned at outermost two deflector draws
Flow that section 2 height is the height of hemispherical dome 5 0.15~0.2, from outermost two deflector inwardly, between adjacent baffle between
The height of straight flange Drainage Section 2 away from gradually increase and each deflector depends on flue gas gas velocity and deflector number into arithmetic progression, tolerance
Amount.The height of deflector is the 0.5~0.9 of the height of hemispherical dome 5；Preferred 6mm~the 20mm of thickness of deflector.
If the radius of the crooked radian of arc diversion section 3 or the arc of arc diversion section 3 is too small, flue gas even distribution can be caused
Effect is poor, and flue gas low regime is formed in the both sides of hemispherical dome 5；Conversely, both sides gas velocity is excessive, central area gas velocity mistake
It is low, vortex is formed, gas velocity inequality, drag losses increase is caused.In the present invention, the half of the arc of each deflector arc diversion section 3
Footpath is equal, and the radius is the 0.2 of the height of hemispherical dome 5；From outermost two deflector inwardly, each deflector arc diversion section 3
Arc central angle into arithmetic progression；The central angle of the arc of arc diversion section 3 is 30 °~90 °.By using above-mentioned deflector,
Uniformly in the gas velocity distribution of the structure of hemispherical dome 5, internal vortex can be reduced by flue gas, the low temperature dew point for reducing air preheater is rotten
Lose generation area, it is ensured that the Effec-tive Function of air preheater.Tested by field experiment, in the day of addition deflector circularly
The exit of 5 structures of side, gas unevenness Mf0.6 is down to from 3, resistance drop reduces 20Pa or so, the entirety of air preheater
Efficiency improves 5~10%.
Claims (8)
1. a kind of flow-guiding structure of air preheater smoke inlet, including by flue gas cylinder interface (1), hemispherical dome (5), preheating
The exhaust gases passes of device rectangular interface (6) composition, it is characterised in that：Open deflector is installed in hemispherical dome (5)；
Described open deflector is made up of some deflectors, and the two ends of deflector are welded on the interior of hemispherical dome (5)
On wall, the deflector in open deflector is symmetrically distributed；
Described deflector is made up of vertical straight flange Drainage Section (2) and arc diversion section (3) from top to bottom；Each straight flange Drainage Section
(2) upper end is located at same level；The upper end of arc diversion section (3) and straight flange Drainage Section (2) are tangent, and lower end is to hemispherical dome
(5) wall direction bending.
2. the flow-guiding structure of air preheater smoke inlet according to claim 1, it is characterised in that：From outermost two
Deflector inwardly, the spacing between adjacent baffle gradually increase and each deflector straight flange Drainage Section (2) highly into etc. difference
Row.
3. the flow-guiding structure of air preheater smoke inlet according to claim 1 or 2, it is characterised in that：Positioned at outermost
The straight flange Drainage Section (2) of two deflectors of side is highly the 0.15~0.2 of hemispherical dome (5) height.
4. the flow-guiding structure of air preheater smoke inlet according to claim 1 or 2, it is characterised in that：Described is each
The radius of the arc of deflector arc diversion section (3) is equal.
5. the flow-guiding structure of air preheater smoke inlet according to claim 4, it is characterised in that：From outermost two
Inwardly, the central angle of the arc of each deflector arc diversion section (3) is into arithmetic progression for deflector.
6. the flow-guiding structure of the air preheater smoke inlet according to claim 1,2 or 5, it is characterised in that：The arc
The central angle of the arc of shape diversion section (3) is 30 °~90 °.
7. the flow-guiding structure of air preheater smoke inlet according to claim 1 or 2, it is characterised in that：Described arc
The height of shape air deflector is the 0.5~0.9 of hemispherical dome (5) height.
8. the flow-guiding structure of air preheater smoke inlet according to claim 1 or 2, it is characterised in that：Described leads
The thickness for flowing plate is 6mm~20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510378609.7A CN104930540B (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 |
|---|---|---|---|
| CN201510378609.7A CN104930540B (en) | 2015-06-30 | 2015-06-30 | The flow-guiding structure of air preheater smoke inlet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104930540A CN104930540A (en) | 2015-09-23 |
| CN104930540B true CN104930540B (en) | 2017-07-28 |
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| CN201510378609.7A Active CN104930540B (en) | 2015-06-30 | 2015-06-30 | The flow-guiding structure of air preheater smoke inlet |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107570001A (en) * | 2017-10-31 | 2018-01-12 | 苏州顺为环境科技有限公司 | Flue gas mixture generator |
| CN110385560A (en) * | 2019-07-09 | 2019-10-29 | 中国航发哈尔滨东安发动机有限公司 | Bearing installs heating device |
| CN112304120B (en) * | 2019-07-31 | 2022-08-02 | 中国石油天然气集团有限公司 | Heat exchanger |
| CN113369821B (en) * | 2021-06-28 | 2022-09-27 | 中通钢构股份有限公司 | Ceiling-circle-and-square-place construction process for waste heat recovery ventilation pipeline |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101435672B (en) * | 2008-12-08 | 2010-06-02 | 西安交通大学 | Design method of sudden enlarging-shaped smoke air channel airflow uniformitarian flow guiding device |
| CN101766950B (en) * | 2008-12-30 | 2011-10-05 | 上海电气石川岛电站环保工程有限公司 | Flue gas flow equalizing and guiding assembly of selective catalyctic reduction (SCR) denitration reactor inlet |
| CN101545626B (en) * | 2009-03-20 | 2011-02-09 | 西安交通大学 | Multi-level flow equalization anti-abrasion device of a waste boiler inlet |
| CN103486602B (en) * | 2013-10-08 | 2015-07-01 | 东南大学 | Three-level flow equalizing, diffusion and transition flue of heat recovery boiler of gas turbine |
| CN104197771B (en) * | 2014-09-12 | 2016-01-20 | 甘肃蓝科石化高新装备股份有限公司 | A kind of current equalizing structure for heat exchanger plate bundle gas access |
| CN204730237U (en) * | 2015-06-30 | 2015-10-28 | 山东旺泰科技有限公司 | The flow-guiding structure of air preheater smoke inlet |
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