CN207599778U - A kind of change flue cross section tubular air preheater structure - Google Patents
A kind of change flue cross section tubular air preheater structure Download PDFInfo
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- CN207599778U CN207599778U CN201721616438.8U CN201721616438U CN207599778U CN 207599778 U CN207599778 U CN 207599778U CN 201721616438 U CN201721616438 U CN 201721616438U CN 207599778 U CN207599778 U CN 207599778U
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- flue
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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 discloses a kind of change flue cross section tubular air preheater structures,Including air preheater shell,Using horizontal arrangement,Flue gas is flowed into from the gas inlet of lower section,It is flowed out from the exhanst gas outlet of top,The outer surface of the heat-exchanging tube bundle of lateral arrangement is washed away in flow process,Air is then in heat exchange Bottomhole pressure,Heat is constantly transmitted to air by flue gas by heat exchanging pipe wall,As flue-gas temperature is gradually reduced,The flow velocity of flue gas is gradually reduced,It is too many in order not to decline flue gas flow rate,Cause the heat-exchanging tube bundle back side for closing on exhanst gas outlet that dust stratification occurs and leads to serious security risk,The utility model is designed using isobaric smoke flow channels,Gas inlet section is made to be more than exhanst gas outlet section,Smoke flow channels are gradually reduced,So that the flue gas flow rate that the flue gas flow rate of exhanst gas outlet is kept to be greater than or equal to gas inlet is remained in the case where flue-gas temperature continuously decreases,The design can make heat exchange tube wall temperature improve about 10~30 DEG C than vertical mode,Effectively mitigate heat exchanger tube in the low-temperature corrosion of fume side and the coupling of dust stratification.
Description
Technical field
It is specifically a kind of to prevent corrosion of sulfuric acid at dew point and heat-exchanging tube bundle from carrying on the back the utility model is related to boiler plant technical field
The variable cross-section flue tubular air preheater structure of area ash.
Background technology
Air preheater is the equipment for going out air needed for the heat burning of flue gas using boiler economizer heel row, mainly
For improving the heat exchange performance of boiler, exhaust gas temperature is reduced, thermal loss is reduced and improves the operating condition of air-introduced machine.Air
Preheater can be divided into cast iron tubular air preheater, steel tubular air heater, steel plate regenerative air heater by material therefor
With glass pipe type air preheater etc., wherein being most widely used with steel tubular air heater.At present in China's steam raising
It is that 220t/h and following boiler use steel tubular air heater mostly to measure, and main heat transfer component is seamed thin-wall steel tube,
The vertical stagger arrangement arrangement of heat exchanger tube generally use, both ends are fixed with upper and lower Tube-sheet Welding, advantage be it is simple in structure, it is at low cost
Honest and clean, shortcoming is that heat exchanger tube fume side can generate serious low-temperature corrosion and dust stratification, stifled ash even wear phenomenon.
The arrangement of tubular air preheater has vertical and horizontal two kinds of arrangement.When boiler capacity is larger, such as steam
Hair amount is the boiler of 220t/h, and boiler back end ductwork has enough spaces that can arrange level-one or secondary air preheater to obtain
Sufficiently high combustion-supporting hot air temperature participates in fuel combustion, and therefore, steel tubular air heater uses vertical mode mostly,
Flue gas flows through in heat exchanger tube from the top down, and air is outside heat exchanger tube on the outside of transversal flow pipe, but the vertical cloth of air preheater
When putting, there are air preheater heat exchange tube wall temperature it is relatively low the shortcomings that, the low temperature that heat exchanger tube fume side can be further aggravated in this is rotten
Lose phenomenon.
When air preheater applications are in Industrial Boiler, since boiler capacity is less than electricity generation boiler, boiler height is inadequate, nothing
Air preheater is positioned over back-end ductwork using the vertical mode in flue gas from the top down flush pipe, 1 institute of below figure by method
Show, in this case, to save space, that air preheater is mostly arranged in boiler rear portion exhanst gas outlet is upward by designer
Position, this results in the air preheater structure that flue gas washes away from bottom to top, but the air that flue gas washes away from bottom to top is pre-
In hot device structure because flue gas flow up, tiny ash particle follows the ability of air-flow relatively good, still, slightly larger ash particle with
It is poor with the ability of air-flow, in sulfided state, it is easy to be deposited on tube bank surface, causes dust stratification, if pipe wall surface temperature is low, also
Low-temperature corrosion and low-temperature corrosion and the coupling of dust stratification are easily caused, stifled ash or even blowing out are caused when serious.It is if single
The pure structure built flue gas and washed away from the top down will certainly form 2 90 degree of flue turning elbow, increase flue gas resistance
Power.
Utility model
Invention content
The purpose of this utility model is that a kind of tubular air preheater structure for becoming flue cross section of design, above-mentioned to solve
The problem of being proposed in background technology.
To achieve the above object, the utility model provides following technical solution：
A kind of change flue cross section tubular air preheater structure, including air preheater shell 1, outside the air preheater
Multiple tube sheets are vertically arranged in shell 1, lateral arrangement there are multiple heat exchanger tubes 8, and heat exchanger tube 8 is inserted into tube sheet and forms heat-exchanging tube bundle, profit
With tube sheet support heat-exchanging tube bundle, the gap between adjacent tube sheet and heat-exchanging tube bundle forms smoke flow channels 9；The air preheater
1 left side of shell is provided with the air intlet 2 that cold air can enter in heat exchanger tube 8, and right side is provided with heated hot-air can
Flow out the air outlet slit 4 of heat exchanger tube 8；1 bottom of air preheater shell, which is provided with high-temperature flue gas, can flow into smoke flow channels 9
Gas inlet 3, top, which is provided with the low-temperature flue gas that heat exchange postcooling is got off, can flow out the exhanst gas outlet 7 of smoke flow channels 9, cigarette
Gas outlet 7 connects flue tail end 5 and chimney by smokejack 6；The air preheater shell 1 uses horizontal arrangement, heat exchanger tube 8
The heat-exchanging tube bundle of formation is arranged according to trapezoid cross section, and the section at gas inlet end is made to be more than exhanst gas outlet end section, i.e. flue gas
3 section of import is more than 7 section of exhanst gas outlet；Flue gas laterally skims over outside heat exchanger tube 8, air longitudinal flow in heat exchanger tube 8, high
Heat is constantly transmitted to cold air by warm flue gas by 8 wall surface of heat exchanger tube.
The heat exchanger tube 8 is using borosilicate heat-proof glass pipe, seamed steel pipe, seamless steel pipe or enamel pipe.
Enhancing air preheater as heat exchanger tube 8 close to 3 sections of installation seamed steel pipes of gas inlet of air preheater
Rigidity and Auxiliary support tube sheet, and, as heat exchanger tube 8, have close to 7 sections of exhanst gas outlet installation borosilicate heat-proof glass pipes
Heat resisting temperature is high, surface smooth the advantages that being not easy dust stratification and strong resistance to acid dew piont corrosion performance, can effectively solve air preheater
7 sections of exhanst gas outlet heat exchange tube wall dust stratification and heat exchanger tube between block up grey problem.
The heat exchanger tube 8 uses the mode of being staggered in arrangement to strengthen the disturbance to flue gas stream, augmentation of heat transfer effect.
Caliber is used, so that its structure is compact as possible, to reduce air as possible for the heat exchanger tube 8 of the pipe with small pipe diameter of 40mm~42mm
The occupied space of preheater；The pipe range of heat exchanger tube 8 takes 2m~3m.
Gap between the heat exchanger tube 8 and tube sheet is filled with asbestos wool filler.It has simple in structure, replacement convenience,
Many advantages, such as good seal.
The smoke flow channels 9 are designed using isobaric, i.e., the smoke flow channels 9 for suitably reducing 7 sections of exhanst gas outlet are cut
To improve the flow velocity of low-temperature flue gas, the dust granule for the middle carrying that effectively removes smoke subtracts suddenly in 7 sections of flow velocitys of exhanst gas outlet in face
The small security risk for causing 8 beam back side fouling of heat exchanger tube.
When boiler capacity is larger or air mass flow is larger, tube sheet designs in a manner that sub-module manufactures, sub-module transports
Then production is carrying out Assembling completion again.
8 beam of heat exchanger tube is arranged using trapezoid cross section, the gas inlet 3 of flue gas from below washes away cigarette first after flowing into
Heat-exchanging tube bundle near gas import 3 since the flue-gas temperature at gas inlet 3 is higher, therefore should suitably increase 8 wall of heat exchanger tube herein
Area to enhance heat transfer effect, 8 beam of heat exchanger tube using trapezoidal arrangement can make high-temperature flue gas at gas inlet 3 with it is more
8 wall surface of heat exchanger tube contact with strengthen convection current heat transfer；As heat is constantly passed to heat exchanger tube by flue gas by 8 wall surface of heat exchanger tube
Air in 8, flue-gas temperature constantly reduce, and specific volume reduces therewith, therefore should suitably shrink 9 section of smoke flow channels to maintain cigarette
The optimum flow rate of gas prevents excessively slow by flue gas flow rate and leads to a large amount of dust stratifications of 8 wall of heat exchanger tube；Due to the flue gas at exhanst gas outlet 7
It has completed to exchange heat, temperature is relatively low, and exchange capability of heat is relatively poor, therefore should suitably reduce 8 wall area of heat exchanger tube to weaken heat exchange
Interbank thermal deviation effect, heat-exchanging tube bundle can make the heat exchange that flue gas contacts at exhanst gas outlet 7 using trapezoidal arrangement
8 wall area of pipe becomes smaller to achieve the purpose that reduce 8 thermal deviations of heat exchanger tube.
Utility model utility model utility model utility model utility model
Compared with prior art, the utility model has been abandoned traditional on the basis of vertical steel tubular air heater
Vertical mode and use horizontal arrangement, about 10~30 DEG C of 8 wall temperature of heat exchanger tube can be improved, effectively alleviate and change
Heat pipe 8 is particularly suitable for using the boiler of high-sulfur combustor, and can weaken the heat between heat exchanger tube 8 in the low-temperature corrosion of fume side
Deflection effect, while help to remain the reasonable flow rate of flue gas, it is blocked up between 8 wall dust stratification of heat exchanger tube and heat exchanger tube 8 so as to mitigate
Grey problem.And borosilicate heat-proof glass pipe is used to significantly reduce heat exchange as heat exchanger tube in 3 sections of the gas inlet of air preheater
8 wall of pipe is in the low-temperature corrosion of fume side and fouling phenomenon.Smoke flow channels 9 are designed using isobaric variable cross-section, heat exchanger tube
Beam is arranged according to trapezoid cross section, effectively reduces the thermal deviation effect between heat-exchanging tube bundle, maintains flue gas in flue gas stream
Optimum flow rate in dynamic channel 9 improves the job security and reliability of air preheater.
Description of the drawings
Utility model Fig. 1 is existing coal-fired chain grate boiler structure total figure.
Fig. 2 is the basic block diagram of the utility model.
Fig. 3 is the structure diagram of air preheater enclosure cross section A-A.
Specific embodiment
It elaborates below in conjunction with attached drawing to the structure and operation principle of the utility model.
As shown in Fig. 2, when the utility model is used, the gas inlet 3 of flue gas from 1 lower section of air preheater shell flows
Enter, air is then flowed in the heat exchanger tube of lateral arrangement 8, flue gas along 9 uplink of smoke flow channels formed between heat exchanger tube 8 simultaneously
Wash away 8 wall outer surface of heat exchanger tube, air heat being constantly transmitted in heat exchanger tube 8.Specifically, cold air to be heated is along changing
Heat pipe 8 is flowed into from the air intlet 2 in left side inside air preheater shell 1, and high-temperature flue gas is then from 1 bottom of air preheater shell
Gas inlet 3 flow into and along 9 uplink of smoke flow channels, constantly wash away 8 outside wall surface of heat exchanger tube in the process to heat
Cold air in heat exchanger tube 8 completes heat transfer process.Heated hot-air is flowed along heat exchanger tube 8 from the air outlet slit 4 on right side
Go out air preheater shell 1, the low-temperature flue gas that heat exchange postcooling is got off is then by the exhanst gas outlet 7 on 1 top of air preheater shell
Into smokejack 6 and finally chimney is drained into from flue tail end 5.
Temperature reduces after the heat-exchanging tube bundle that 3 sections of sweep of gases gas inlet, and specific volume reduces, as a result of as shown in Figure 3
Heat-exchanging tube bundle trapezoid cross section arrangement, 9 section of smoke flow channels is gradually reduced, so flue gas remains able to remain
Reasonable flow rate, it is therefore prevented that 8 wall dust stratification of heat exchanger tube caused by flue gas flow rate excessively reduces and stifled grey problem.3 sections of flue gases of gas inlet
Temperature it is higher, exchange capability of heat compared with strong and the temperature of 7 sections of flue gases of exhanst gas outlet is relatively low, exchange capability of heat is poor.As a result of such as
Heat-exchanging tube bundle trapezoid cross section shown in Fig. 3 arrangement, 8 quantity of heat exchanger tube for enabling to 3 sections of gas inlet is relatively more, changes
8 wall area of heat pipe is larger, and having reached makes the high-temperature flue gas at gas inlet 3 and air have sufficiently large heat exchange area to be changed to strengthen
The purpose of thermal effect；But also 8 quantity of heat exchanger tube of 7 sections of exhanst gas outlet is relatively fewer, 8 wall surface of heat exchanger tube is suitably reduced
Product, it is therefore prevented that flue-gas temperature excessively reduces and aggravate the low-temperature corrosion phenomenon of 8 wall fume side of heat exchanger tube, can also reduce heat exchanger tube
Thermal deviation effect between 8 improves reliability and the safety of air preheater work.
Claims (8)
1. a kind of change flue cross section tubular air preheater structure, including air preheater shell (1), it is characterised in that：It is described
Multiple tube sheets are vertically arranged in air preheater shell (1), lateral arrangement has multiple heat exchanger tubes (8), heat exchanger tube (8) insertion tube
Plate forms heat-exchanging tube bundle, and using tube sheet support heat-exchanging tube bundle, the gap between adjacent tube sheet and heat-exchanging tube bundle forms flow of flue gas and leads to
Road (9)；The air intlet (2) that cold air can enter in heat exchanger tube (8) is provided on the left of the air preheater shell (1), it is right
Side, which is provided with heated hot-air, can flow out the air outlet slit (4) of heat exchanger tube (8)；It opens air preheater shell (1) bottom
There is the gas inlet (3) that high-temperature flue gas can flow into smoke flow channels (9), top is provided with the low temperature cigarette that heat exchange postcooling is got off
Gas can flow out the exhanst gas outlet (7) of smoke flow channels (9), and exhanst gas outlet (7) connects flue tail end by smokejack (6)
(5) and chimney；The air preheater shell (1) uses horizontal arrangement, and the heat-exchanging tube bundle that heat exchanger tube (8) is formed is according to trapezoidal section
Face is arranged, and the section at gas inlet end is made to be more than exhanst gas outlet end section, i.e. gas inlet (3) section is more than exhanst gas outlet
(7) section；Flue gas laterally skims over outside in heat exchanger tube (8), and air passes through heat exchange in heat exchanger tube (8) interior longitudinal flow, high-temperature flue gas
Heat is constantly transmitted to cold air by pipe (8) wall surface.
2. a kind of change flue cross section tubular air preheater structure according to claim 1, it is characterised in that：The heat exchange
(8) are managed using borosilicate heat-proof glass pipe, seamed steel pipe, seamless steel pipe or enamel pipe.
3. a kind of change flue cross section tubular air preheater structure according to claim 1, it is characterised in that：By near-space
Gas inlet (3) section of air preheater installs seamed steel pipe as heat exchanger tube (8) to enhance the rigidity of air preheater and auxiliary
Tube sheet is supported, and, as heat exchanger tube (8), it is pre- effectively to solve air close to exhanst gas outlet (7) section installation borosilicate heat-proof glass pipe
Ash problem is blocked up between the heat exchange tube wall dust stratification and heat exchanger tube of exhanst gas outlet (7) section of hot device.
4. a kind of change flue cross section tubular air preheater structure according to claim 1, it is characterised in that：The heat exchange
Pipe (8) uses the mode of being staggered in arrangement to strengthen the disturbance to flue gas stream, augmentation of heat transfer effect.
5. a kind of change flue cross section tubular air preheater structure according to claim 1, it is characterised in that：Using caliber
The heat exchanger tube (8) of pipe with small pipe diameter for 40mm~42mm, so that its structure is compact as possible, the occupancy for reducing air preheater as possible is empty
Between；The pipe range of heat exchanger tube (8) takes 2m~3m.
6. a kind of change flue cross section tubular air preheater structure according to claim 1, it is characterised in that：The heat exchange
It manages the gap of (8) between tube sheet and is filled with asbestos wool filler.
7. a kind of change flue cross section tubular air preheater structure according to claim 1, it is characterised in that：The flue gas
Flow channel (9) is designed using isobaric, i.e., smoke flow channels (9) section for suitably reducing exhanst gas outlet (7) section is low to improve
The flow velocity of warm flue gas, the dust granule for the middle carrying that effectively removes smoke reduces suddenly in exhanst gas outlet (7) section flow velocity to be caused to change
The security risk of heat pipe (8) beam back side fouling.
8. a kind of change flue cross section tubular air preheater structure according to claim 1, it is characterised in that：When boiler holds
Measure larger or air mass flow it is larger when, tube sheet is manufactured by sub-module, designs production in the way of sub-module transport, is then being carried out again
Assembling is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721616438.8U CN207599778U (en) | 2017-11-28 | 2017-11-28 | A kind of change flue cross section tubular air preheater structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721616438.8U CN207599778U (en) | 2017-11-28 | 2017-11-28 | A kind of change flue cross section tubular air preheater structure |
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| Publication Number | Publication Date |
|---|---|
| CN207599778U true CN207599778U (en) | 2018-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721616438.8U Active CN207599778U (en) | 2017-11-28 | 2017-11-28 | A kind of change flue cross section tubular air preheater structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107860022A (en) * | 2017-11-28 | 2018-03-30 | 西安交通大学 | One kind becomes flue cross section tubular air preheater |
| CN109556927A (en) * | 2018-12-26 | 2019-04-02 | 南京理工大学 | The sampler and method of mercury in a kind of high-temperature flue gas |
-
2017
- 2017-11-28 CN CN201721616438.8U patent/CN207599778U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107860022A (en) * | 2017-11-28 | 2018-03-30 | 西安交通大学 | One kind becomes flue cross section tubular air preheater |
| CN107860022B (en) * | 2017-11-28 | 2023-10-24 | 西安交通大学 | Variable flue section tubular air preheater |
| CN109556927A (en) * | 2018-12-26 | 2019-04-02 | 南京理工大学 | The sampler and method of mercury in a kind of high-temperature flue gas |
| CN109556927B (en) * | 2018-12-26 | 2024-05-17 | 南京理工大学 | Sampling device and method for mercury in high-temperature flue gas |
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