CN107869730A - Rotary regenerative air preheater - Google Patents
Rotary regenerative air preheater Download PDFInfo
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- CN107869730A CN107869730A CN201711067226.3A CN201711067226A CN107869730A CN 107869730 A CN107869730 A CN 107869730A CN 201711067226 A CN201711067226 A CN 201711067226A CN 107869730 A CN107869730 A CN 107869730A
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- air
- perforate
- lattice
- air preheater
- vent
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
-
- 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 present invention relates to a kind of air preheater, and disclose a kind of rotary regenerative air preheater that air leak rate of air curtain can be further reduced in a manner of relatively saving, the air preheater be air bin lattice and flue gas storehouse lattice into Er Fencang, three points of storehouses or four points of storehouse forms, including rotor, fanning strip and wind crosswind machine, perforate corresponding with air bin lattice is set in cold end and hot junction fanning strip middle position respectively, perforate is scallop hole, central angle θ of the scallop hole corresponding to it scope is 1 o~4o, and air-vent is set corresponding to perforate, air-vent is connected to the arrival end of pressure fan by respective distribution pipeline, flow regulator is set on each distribution pipeline, air preheater can be allowed to realize the purpose for reducing air leak rate of air curtain under different load.It can be used for brand-new air preheater or be applied to the transformation project for reducing air preheater air leakage rate demand.
Description
Technical field
The present invention relates to a kind of air preheater, is controlled more particularly, to the inleakage of rotary regenerative air preheater.
Background technology
Rotary regenerative air preheater is afterbody heat transmission equipment widely used on big-and-middle-sized station boiler, its main function
It is：1. further reducing exhaust gas temperature, boiler efficiency is improved, so as to reach fuel-saving purpose；2. improve feeding
The air for combustion temperature of boiler, is advantageous to the stability of burning, and improves the after-flame degree of fuel, that is, improves combustion
Burn efficiency；3. improving the temperature levels of flue gas in whole equipment, the temperature and pressure between working medium are increased, were conducted heat so as to enhance
Journey.
Rotary regenerative air preheater has the advantages that compact-sized, steel consumption less, is easily arranged compared with tubular preheater,
It is the significant drawback of the kind equipment but rotary air preheater air leak rate height is insoluble problem, so returning
In rotary air preheater technology, prevent or reduce i.e. Sealing Technology of leaking out and occupy critically important status.The leakage of air preheater
Wind can cause the change of unit thermal drying, and with the increase of inleakage, hot blast temperature declines, and exhaust gas temperature also declines, and discharges fume
Temperature declines causes the reduction of cold end wall temperature of heated surface again, accelerates the process of low-temperature corrosion；Leak out and have an effect on the warp of unit operation
Ji benefit, on the one hand it reduces the thermal efficiency of unit, on the other hand add the power consumption of ventilating machinary, enterprise is generated electricity
Coal consumption and net coal consumption rate increase.Therefore rotary regenerative air heater reduces to leak out and direct effect and produces warp to solving the above problems
Ji benefit.
Air preheater leaks out by directly leaking out and the carrying two parts that leak out form.It is with determining by rotor that air preheater, which directly leaks out,
Gap and cigarette wind side pressure difference between son cause, and directly leak out and occupy lion's share in total inleakage, so reducing empty pre-
The measure that device leaks out is mainly to reduce directly leaking out for air preheater.The internal rotor of rotary regenerative air heater is except filled with accumulation of heat member
Outside part bag, the space of a part also be present, due to being filled with air in space, the air in space can be taken when the rotor is turning
Take fume side to, this part is leaked out referred to as to carry and leaked out.Due to the structure type of rotary preheater, carrying is leaked out and can not kept away
Exempt from.
Divided by the quantity of cigarette/air bin lattice, it is pre- that rotary regenerative air heater is generally divided into Liang Fencang, three Fen Cang and four points of storehouses skies
Device, see accompanying drawing 1, Fig. 2 and Fig. 3 of the present invention.Two points of storehouse rotary regenerative air heaters are divided into fume side and wind side（Air side）, in oil-burning machine
In group frequently with；Three points of storehouse rotary regenerative air heaters are divided into fume side, First air side and Secondary Air side, in conventional pulverized-coal stove unit
Frequently with the structure type is widely used in Practical Project；Four points of storehouse rotary regenerative air heaters be divided into fume side, First air side and
Two Secondary Air sides, wherein, First air side is arranged in the centre of two Secondary Air sides, in Properties of CFB frequently with.
With reference to the characteristics of the two kinds of structures in Liang Fencang and four point of storehouse, the Sealing Technology in wind and smoke side is substantially similar.
The pressure head of air preheater wind side is malleation, wherein First air pressure head highest, and Secondary Air pressure head takes second place, and flue gas is negative pressure,
Therefore pressure head is minimum, i.e., the intersection in wind and smoke side, pressure difference is caused directly to leak out, and First air/Secondary Air is leaked to fume side.And by
Maximum with the pressure difference of flue gas in First air, the amount that First air is leaked to flue gas is most.The method directly leaked out is reduced mainly to pass through
Reduction is leaked out with area and reduces pressure difference to realize.
Air preheater directly leaks out mainly due to wind side（Often it is divided into First air side and Secondary Air side again, both sides are all for just
Pressure, First air side pressure head are bigger than Secondary Air side pressure head）Caused with the pressure difference of fume side negative pressure.Especially First air pressure head and cigarette
The pressure difference of gas side is maximum, and this part is directly leaked out at most.
The existing means directly leaked out that reduce are mainly that reduction is leaked out with area and reduces pressure difference to realize.Air preheater exists
Due to the hot shaping of the hot shaping of air preheater rotor, fanning strip and arc in actual moving process, under different load
The gap width of each several part is different.Need precisely to estimate deflection under each state in design, while be control gap width, pair set
Standby requirement on machining accuracy is very high.Also, by setting multilayer contact face, come just like means such as increase diaphragm seal number of plies technologies in addition
Pressure difference is successively reduced, reduces the inleakage of each contact surface by reducing the pressure difference of each contact surface.
The comprehensive development at present of above two technology path is " three sealing structures+multi-touch formula flexible sealing " technology,
And achieve good Air leakage control effect.Due to being limited and manufactured the difficulty in terms of processing by physical dimension, current three is close
Encapsulation technique has evolved to the limit, by reduce pressure difference and leak out with area come reduce the technological means leaked out difficulty have it is bigger
Development space.
It is " a kind of empty pre- in the Chinese utility model patent that notification number disclosed in 23 days November in 2016 is CN205717302U
Device system ", it includes rotary regenerative air preheater and recovery system of leaking out, and the recovery system of leaking out includes blower fan, is connected to
Blast pipe on air inlet, the discharge pipe being connected on fan outlet, the arrival end of the blast pipe are arranged at revolution
At the leaking out of regenerative air heater, the port of export of the discharge pipe be arranged at rotary regenerative air preheater wind side porch or
In the gas flow paths of wind side.Recovery system of leaking out above is used for the sky for radially, axially leaking rotary regenerative air preheater
Gas is reclaimed, and is directed to the porch or wind side of rotary regenerative air preheater wind side after the mixing of the air of recovery by discharge pipe
In gas flow paths, refer to any position between the both ends of rotary regenerative air preheater wind side with the gas flow paths of weather side
Put.Its solve be existing rotary regenerative air heater leak out recovery system " blower fan recovery air preheater in cold end, hot junction, axial direction
The problem of reducing secondary air temperature by way of wind, then the air preheater Secondary Air port of export is squeezed into fan outlet ", to a certain degree
On also compensate for inleakage loss.
, it is necessary to be separately provided blower fan in such scheme, increase and the equipment fault point of the personal electric consumption of factory are brought, is put into
, may not energy efficiency into whole boiler island.And the blower fan set up belongs to high-temperature blower, the reliability of equipment be also it is important because
Element.
The content of the invention
In order to overcome the shortcomings of it is existing be difficult to further reduce air preheater air leakage rate by improving sealing means, this
The technical problems to be solved by the invention be to provide can further be reduced under a kind of equal air-proof condition air preheater air leakage rate and more
For the rotary regenerative air preheater of energy-conservation.
The thinking solved the problems, such as of the present invention is, it is contemplated that leaks out the most seriously, therefore in air the larger position of pressure difference
The cold end of preheater and hot junction all set distribution pipeline, are drained into partly leaking out using the blower fan of air preheater itself outfit
The fans entrance end of wind side, to reduce pressure difference, reduction is leaked out.The present invention is based on above inventive concept, is showed according to air preheater
Some Liang Fencang, San Fencang, four points of chamber structures, technical scheme used by solution aforementioned technical problem is proposed respectively.
Rotary regenerative air preheater, the air preheater be air bin lattice and flue gas storehouse lattice into two points of storehouse forms,
Including rotor, fanning strip, pressure fan, open corresponding with air bin lattice is set in cold end and hot junction fanning strip middle position respectively
Hole, and air-vent is set corresponding to perforate, air-vent is connected to the arrival end of pressure fan each via distribution pipeline, each shunting
Flow regulator is set on pipeline.
Rotary regenerative air preheater, the air preheater are a wind cabin lattice, secondary wind cabin lattice and flue gas storehouse lattice into
Three points of storehouse forms, including rotor, fanning strip, primary air fan, overfire air fan, respectively in cold end and hot junction fanning strip centre position
Place sets perforate corresponding with a wind cabin lattice, and sets air-vent corresponding to perforate, and air-vent is each via distribution pipeline
The arrival end of connecting secondary blower fan, flow regulator is set on each distribution pipeline；Respectively in cold end and hot junction fanning strip interposition
Put place and perforate corresponding with secondary wind cabin lattice is set, and air-vent is set corresponding to perforate, air-vent is each via isocon
The arrival end of road connecting secondary blower fan, flow regulator is set on each distribution pipeline.
Rotary regenerative air preheater, the air preheater are a wind cabin lattice, two secondary wind cabin lattice and flue gas storehouse lattice
The four points of storehouse forms formed, including rotor, fanning strip, primary air fan, overfire air fan, respectively among cold end and hot junction fanning strip
Opening position sets perforate corresponding with secondary wind cabin lattice, and sets air-vent corresponding to perforate, and air-vent is each via shunting
The arrival end of pipeline connecting secondary blower fan, flow regulator is set on each distribution pipeline.
The present invention can directly reduce the air of high pressure rostral to the leakage rate of low-head fume side, while cold heat end air
The region of temperature close is all divided to, is a kind of technology of the reduction air preheater air leakage of low energy, each distribution pipeline can be only
Vertical regulation flow, such as under boiler BMCR EIAJ operating modes, flow regulator aperture 100%, under boiler 75%THA operating modes,
It is 70% to control flow regulator aperture by closed-loop system, realizes that different load declines by adjusting different bypass flows
The purpose of low air preheater air leak rate of air curtain.
It is further that the perforate is scallop hole, and the scope of the central angle θ corresponding to it is 1 o~4o, scallop hole
Corresponding region is close and can cover region of most easily leaking out substantially, and wider further away from center, aperture.Air preheater is hot
During operation, it will mushroom deformation occurs, so as to cause the change of former seal interface, hot when, air preheater rotor portion
Outside sinks, and the gap formed after deformation, as the part exists always, will form a larger passage that leaks out.Perforate is fan
The advantages of shape hole is to go out that perforate is bigger further away from center just, and leaking out herein is also bigger, can so make the distinguished and admirable of extraction
Amount matches with flow area, and each fan-shaped bore region through flow velocity is basically identical, reduces local resistance.Set relative to perforate
Air-vent, more specifically, refer in the connection air channel of fixation of aperture perimeters arrangement of the fanning strip away from rotor side and square
Just the structure for being connected and turning on isocon, it is seamless connection between the connection air channel and fanning strip.Corresponding to weld access hole
Central angle size influence the ratio that actual absorbing quantity accounts for total blast volume, mainly determined according to the parameter of air preheater.
The beneficial effects of the invention are as follows：In each grade station boiler, the present invention can effectively reduce air preheater air leakage
Rate, there is the characteristics of energy-conservation, high reliability, be aided with intelligentized regulation, adaptation of the air preheater equipment under each load can be improved
Ability, i.e. air preheater can reduce air leak rate of air curtain under each load, can be widely applied in station boiler.It may be used on
In fired power generating unit station boiler, boiler or CFBB suitable for using coal, gas, oil, to two points of storehouse air preheaters,
Three points of storehouse air preheaters, four points of storehouse air preheaters are all applicable；May apply to reduces the transformation project of air preheater air leakage rate demand
In, can be on the basis of original air preheater, by setting up distribution pipeline, by the form of original air preheater improvement cost invention, drop
Low air leak rate of air curtain.
Brief description of the drawings
Fig. 1 is two points of chamber structure schematic diagrames of rotary regenerative air preheater.
Fig. 2 is three points of chamber structure schematic diagrames of rotary regenerative air preheater.
Fig. 3 is four points of chamber structure schematic diagrames of rotary regenerative air preheater.
Fig. 4 is the principle schematic that the present invention is used for two points of storehouse air preheaters.
Fig. 5 is the principle schematic that the present invention is used for three points of storehouse air preheaters.
Fig. 6 is the principle schematic that the present invention is used for four points of storehouse air preheaters.
In figure mark for：1- wind side, 2- fume sides, 11- First airs side, 12- Secondary Airs side, 31- fanning strips, 32- fans
Shape plate, 33- fanning strips, 34- fanning strips, 41- hot junctions isocon, 42- cold end isocons, 43- outlet conduits, 51 Flow-rate adjustments
Device, 52- flow regulators, 6- pressure fan, 62- overfire air fans.
Embodiment
The present invention is further described with reference to the accompanying drawings and examples.
As shown in Figure 1, Figure 2 and Figure 3, the Liang Fencang of rotary regenerative air preheater, three Fen Cang and four points of chamber structures.Due to by
The position pressure difference of nearly fume side is maximum, and inleakage is also maximum.Determined after considering to position perforate shunting, reduce pressure difference with
Reduction is leaked out.
Embodiment 1：
As shown in figure 4, for two points of storehouse rotary regenerative air heaters, using the fanning strip of cigarette wind side as boundary, both sides are referred to as wind side
1st, fume side 2, there is perforate on the cold end sector plate 32,33 of cigarette wind side, have out on the hot junction fanning strip 34,31 of cigarette wind side
Hole, each perforate are scallop hole.Central angle size corresponding to perforate is the o of ∣ of θ=∣ θ 1- θ 2=1 on fanning strip 32,33, θ 1 in this example
2=8.5o of=7.5o, θ, central angle size corresponding to perforate is the o of ∣ of θ=∣ θ 3- θ 4=1 on fanning strip 34,31, θ 3=7.5 in this example
4=8.5o of o, θ.1~θ of θ 4 represent angle of the fanning strip edge close to wind side in this example.
Two cold end isocons 42 connect perforate on cold end sector plate 32,33 respectively and air inducing to pressure fan 6 entrance, two
Flow regulator 52 is each provided with cold end isocon 42, the outlet of pressure fan 6 passes through outlet conduits 43 and the wind side of pressure fan
Import connects.
Two hot junction isocons 41 connect perforate on hot junction fanning strip 34,31 respectively and air inducing to pressure fan 6 entrance, two
Flow regulator 51 is each provided with hot junction isocon 41, the outlet of pressure fan 6 passes through outlet conduits 43 and the wind side of pressure fan
Import connects.
According to the difference of load, the flow regulator 52 of cold end and the flow regulator 51 in hot junction are adjusted, it is complete so as to realize
Load effectively control is leaked out.Leaking out at fanning strip enters wind system by above-mentioned passage, is always leaked so as to reduce air preheater
Air quantity.
Embodiment 2：
As shown in figure 5, for three points of storehouse rotary regenerative air heaters, the side of cigarette wind side fanning strip is divided into First air side 11 and secondary again
Wind side 12, opposite side are cigarette side 2, now perforate, the adjacent First air in cold end on the fanning strip 31 of the adjacent First air side in hot junction
Perforate, perforate, the fan in the adjacent Secondary Air side in hot junction on the fanning strip 33 of the adjacent Secondary Air side of cold end on the fanning strip 32 of side
Perforate on shape plate 34.Each perforate is scallop hole.
Central angle size corresponding to perforate is the o of ∣ of θ=∣ θ 5- θ 6=1 on fanning strip 32, θ 6=7.5o of 5=6.5o, θ in this example,
Central angle size corresponding to perforate is the o of ∣ of θ=∣ θ 1- θ 2=1 on fanning strip 33,2=8.5o of θ 1=7.5o, θ in this example.Fanning strip
Central angle size corresponding to perforate is the o of ∣ of θ=∣ θ 3- θ 4=1 on 34,4=8.5o of θ 3=7.5o, θ in this example.Perforate on fanning strip 31
Corresponding central angle size is the o of ∣ of θ=∣ θ 7- θ 8=1.8=9.5o of 7=8.5o of θ in this example, θ.1~θ of θ 4 represent fanning strip in this example
Edge is close to the angle of Secondary Air side, angle of the expression fanning strip edges of 5~θ of θ 8 close to First air side.
Two cold end isocons 42 connect the perforate on cold end sector plate 32,33 and air inducing entering to overfire air fan 62 respectively
Mouthful, it is each provided with flow regulator 52 on two cold end isocons 42, the outlet conduits that the outlet of overfire air fan 62 passes through pressure fan
43 are connected with wind side-entrance.
Two hot junction isocons 41 connect the perforate on hot junction fanning strip 34,31 and air inducing entering to overfire air fan 62 respectively
Mouthful, it is each provided with flow regulator 51 on two hot junction isocons 41, the outlet conduits that the outlet of overfire air fan 62 passes through pressure fan
43 are connected with wind side-entrance.
According to the difference of load, the flow regulator 52 of cold end and the flow regulator 51 in hot junction are adjusted, it is complete so as to realize
Load effectively control is leaked out.Leaking out at fanning strip enters wind system by above-mentioned passage, is always leaked so as to reduce air preheater
Air quantity.
Embodiment 3：
As shown in fig. 6, for four points of storehouse rotary regenerative air heaters, the side of cigarette wind side fanning strip is divided into the First air side 11 of centre again
With the Secondary Air side 12 of its both sides, opposite side is cigarette side 2, the now perforate on the fanning strip 31,34 of the adjacent Secondary Air side in hot junction,
The perforate on the fanning strip 32,33 of the adjacent Secondary Air side of cold end.Each perforate is scallop hole.
Central angle size corresponding to perforate is the o of ∣ of θ=∣ θ 1- θ 2=1 on fanning strip 32,33, and θ 1=7.5o, θ 2 in this example=
8.5o, central angle size corresponding to perforate is the o of ∣ of θ=∣ θ 3- θ 4=1 on fanning strip 31,34, θ 3=7.5o, θ 4=8.5 in this example
º.1~θ of θ 4 represent angle of the fanning strip edge close to Secondary Air side in this example.
Two cold end isocons 42 connect the perforate on cold end sector plate 32,33 and air inducing entering to overfire air fan 62 respectively
Mouthful, it is each provided with flow regulator 52 on two cold end isocons 42, the outlet conduits that the outlet of overfire air fan 62 passes through pressure fan
43 are connected with wind side-entrance.
Two hot junction isocons 41 connect the perforate on hot junction fanning strip 34,31 and air inducing entering to overfire air fan 62 respectively
Mouthful, it is each provided with flow regulator 51 on two hot junction isocons 41, the outlet conduits that the outlet of overfire air fan 62 passes through pressure fan
43 are connected with wind side-entrance.
According to the difference of load, the flow regulator 52 of cold end and the flow regulator 51 in hot junction are adjusted, it is complete so as to realize
Load effectively control is leaked out.Leaking out at fanning strip enters wind system by above-mentioned passage, is always leaked so as to reduce air preheater
Air quantity.
Claims (4)
1. rotary regenerative air preheater, the air preheater be air bin lattice with flue gas storehouse lattice into two points of storehouse forms, bag
Rotor, fanning strip and pressure fan are included, it is characterized in that：Set and air bin lattice in cold end and hot junction fanning strip middle position respectively
Corresponding perforate, and air-vent is set corresponding to perforate, air-vent is connected to the entrance of pressure fan each via distribution pipeline
Hold, flow regulator is set on each distribution pipeline.
2. rotary regenerative air preheater, the air preheater is a wind cabin lattice, secondary wind cabin lattice and flue gas storehouse lattice into
Three points of storehouse forms, including rotor, fanning strip, primary air fan, overfire air fan, it is characterized in that：Respectively in cold end and hot junction fanning strip
Middle position sets corresponding with wind cabin lattice perforate, and corresponding to perforate setting air-vent, air-vent each via
The arrival end of distribution pipeline connecting secondary blower fan, flow regulator is set on each distribution pipeline；It is fan-shaped in cold end and hot junction respectively
Plate middle position sets perforate corresponding with secondary wind cabin lattice, and sets air-vent corresponding to perforate, and air-vent each leads to
The arrival end of distribution pipeline connecting secondary blower fan is crossed, flow regulator is set on each distribution pipeline.
3. rotary regenerative air preheater, the air preheater is a wind cabin lattice, two secondary wind cabin lattice and flue gas storehouse lattice
Into four points of storehouse forms, including rotor, fanning strip, primary air fan, overfire air fan, it is characterized in that：Fanned respectively in cold end and hot junction
Shape plate middle position sets perforate corresponding with secondary wind cabin lattice, and respective corresponding to perforate setting air-vent, air-vent
By the arrival end of distribution pipeline connecting secondary blower fan, flow regulator is set on each distribution pipeline.
4. the rotary regenerative air preheater as described in claim 1,2 or 3, it is characterized in that：The perforate is scallop hole, and its institute is right
The central angle θ answered scope is 1 o~4o.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711067226.3A CN107869730A (en) | 2017-11-03 | 2017-11-03 | Rotary regenerative air preheater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711067226.3A CN107869730A (en) | 2017-11-03 | 2017-11-03 | Rotary regenerative air preheater |
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| CN107869730A true CN107869730A (en) | 2018-04-03 |
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| CN201711067226.3A Pending CN107869730A (en) | 2017-11-03 | 2017-11-03 | Rotary regenerative air preheater |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110030573A (en) * | 2019-05-08 | 2019-07-19 | 国网湖南省电力有限公司 | A kind of system for preventing rotary regenerative air preheater dust stratification from staiing |
| CN110094752A (en) * | 2019-05-29 | 2019-08-06 | 西安热工研究院有限公司 | A kind of automatic control air preheater sealing and anti-blocking system and control method |
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| CN110030573A (en) * | 2019-05-08 | 2019-07-19 | 国网湖南省电力有限公司 | A kind of system for preventing rotary regenerative air preheater dust stratification from staiing |
| CN110094752A (en) * | 2019-05-29 | 2019-08-06 | 西安热工研究院有限公司 | A kind of automatic control air preheater sealing and anti-blocking system and control method |
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Application publication date: 20180403 |