CN106705111B - A kind of fixed self-compensation sealed piece of air preheater and the sealing system comprising it - Google Patents
A kind of fixed self-compensation sealed piece of air preheater and the sealing system comprising it Download PDFInfo
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- CN106705111B CN106705111B CN201710150549.2A CN201710150549A CN106705111B CN 106705111 B CN106705111 B CN 106705111B CN 201710150549 A CN201710150549 A CN 201710150549A CN 106705111 B CN106705111 B CN 106705111B
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- 238000007789 sealing Methods 0.000 title claims abstract description 37
- 238000005192 partition Methods 0.000 claims abstract description 57
- 230000007246 mechanism Effects 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 10
- 235000001674 Agaricus brunnescens Nutrition 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F11/00—Arrangements for sealing leaky tubes and conduits
- F28F11/02—Arrangements for sealing leaky tubes and conduits using obturating elements, e.g. washers, inserted and operated independently of each other
-
- 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
- F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
- F23L2900/15043—Preheating combustion air by heat recovery means located in the chimney, e.g. for home heating devices
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Supply (AREA)
Abstract
The invention discloses a kind of fixed self-compensation sealed piece of air preheater and include its sealing system.The fixed self-compensation sealed piece of air preheater, including diaphragm seal and the first driving piece, diaphragm seal is strip, and the first driving piece is arranged along diaphragm seal length direction, and first driving piece be bonded with diaphragm seal be connected, first driving piece and diaphragm seal be connected region referred to as driving band；In width direction, diaphragm seal one end forms free end beyond the first driving piece, and it is half side far from free end in diaphragm seal width direction to drive band to be located at, the thermal expansion coefficient of first driving piece is greater than the thermal expansion coefficient of diaphragm seal, and the fixed self-compensation sealed on piece of air preheater is equipped with mounting hole.Air preheater hardly follows the deformation of rotor partition from cold conditions to hot, rotor generation " mushroom " deformation, and after diaphragm seal installation of the invention is in place.Compared to other sealing techniques, the present invention has at low cost, high reliablity, the comprehensive advantage of good seal performance.
Description
Technical field
The present invention relates to a kind of fixed self-compensation sealed piece of air preheater and comprising its sealing system, belong to air
Preheater field of sealing technology.
Background technique
Rotary regenerative air preheater is a kind of heat-exchange apparatus applied to large-scale coal-fired power station boiler, it utilizes boiler smoke
The heat of gas come heat burning needed for air, the efficiency of boiler is improved with this.Air preheater rotor by cold conditions to hot,
Since upper/lower terminal face temperature is different and the decrease of the heated rear rigidity of steel, " mushroom " deformation, conventional rigid sealing are generated
Piece is fixed on rotor partition by bolt segmentation, and with the deformation of rotor partition, gap of leaking out also is changed correspondingly.Based on rotor
The mechanism of " mushroom " deformation, axial direction and cold end radial position reserve suitable cold conditions gap, and sound fit clearance is just when hot
It goes to zero；Although hot end radial position cold conditions preset clearance very little, it will form biggish triangle when hot and leak out region.
For reduce above-mentioned triangle leak out region area, reduce air leak rate of air preheater, generally take two in engineering at present
Kind technology path: first is that automatic following system for sectors (letter provisioned in big host producer of the country three (eastern pot breathes out pot and upper pot)
Claim LCS)；Second is that the flexible sealing technology to grow up in recent years.
It can be appreciated that this actually embodies two aspects of a problem: air pre-heater sealing problem is diaphragm seal
With the matching problem of fanning strip, diaphragm seal automatic paste tightening fanning strip and fanning strip automatically track diaphragm seal and can be achieved to reduce and leak out
Purpose.But both schemes in engineer application again be problematic in that: by bad working environments (high temperature, dust etc.), repair quality,
The influence of many factors such as management level, most power plant LCS systems are all unable to bringing normally into operation or the effect that puts into operation is undesirable.
The world-leading rotary regenerative air preheater supplier HOWDEN mating LCS not on air preheater always, also froms the perspective of from side
This bright technology also needs further perfect.And conventional flex sealing technique is even more to expose that rapid wear, structure be unreliable, gap
The problems such as compensation rate is insufficient is unable to satisfy engine request at all.
In short, hot end radial direction triangle leaks out, the Air Leakage in region is not solved always, and with unit to
Large capacity direction is developed, and air preheater rotor diameter constantly increases, if taking no action to, hot end radial direction triangle leaks out region
Share of leaking out is increasing.When such as using conventional rigid diaphragm seal and non-adjustable hot end fanning strip, 300MW unit hot end is radial most
The super 10mm in outer rim gap, the super 25mm of 600MW unit, 1000MW unit gap is in 50mm or so.Provisioned in 600MW and the above unit
Air preheater hot end radial direction triangle leak out and account for 50% or more of total inleakage, the absolute inleakage toward fume side also surpasses 3%,
Primary air leakage can then can exceed that 30%.
Summary of the invention
It leaks out the Air Leakage in region to solve hot end radial direction triangle in the prior art, it is pre- that the present invention provides a kind of air
The fixed self-compensation sealed piece of hot device and the sealing system comprising it.
In order to solve the above technical problems, the technical solution adopted in the present invention is as follows:
A kind of fixed self-compensation sealed piece of air preheater, including diaphragm seal and the first driving piece, diaphragm seal is strip
Shape, the first driving piece are arranged along diaphragm seal length direction, and the first driving piece be bonded with diaphragm seal it is connected, first drive piece with it is close
The connected region of mounting is known as driving band；In width direction, diaphragm seal one end forms free end beyond the first driving piece, and drives
Dynamic band is half side far from free end in diaphragm seal width direction, and the thermal expansion coefficient of the first driving piece is greater than the heat of diaphragm seal
The coefficient of expansion, the fixed self-compensation sealed on piece of air preheater are equipped with mounting hole.
Above-mentioned fitting, which is connected, refers to that the first driving piece is bonded to each other and is fixed together with diaphragm seal；First driving piece and sealing
The connected region of piece refers to the part that the two is fixedly connected；In width direction, diaphragm seal one end is formed freely beyond the first driving piece
On end namely width direction, the diaphragm seal of one end is above the first driving piece；Driving band is located at remote in diaphragm seal width direction
It is half side from free end, namely on the basis of the center line in diaphragm seal width direction, diaphragm seal is divided into two sides up and down, freely
End is located at upside (upside tip portion), and driving band is located at downside.
The above-mentioned fixed self-compensation sealed piece of air preheater is preferably applied to the radial seal of air preheater hot end.
The nouns of locality such as upper and lower, top, bottom end refer both to the relative position under device normal operating condition in the application.
In order to make diaphragm seal reasonable deformation under the first driving piece effect, it is preferable that above-mentioned first driving piece and diaphragm seal
It is connected and is connected to be dotted, all connected points are located along the same line, and composition driving band drives band and diaphragm seal width direction center
Line is parallel.
Above-mentioned dotted connected finger junction is point contact.
Certainly, on the length direction of diaphragm seal, the connected point of the first driving piece and diaphragm seal can also have two rows or more,
On diaphragm seal length direction, all connected point composition driving bands.
It is preferred that the mounting hole of the application is waist-shaped hole (in use, the length direction of waist-shaped hole is vertical with horizontal direction).
The thermal expansion coefficient of above-mentioned first driving piece is greater than the thermal expansion coefficient of diaphragm seal, the first driving piece expansion after being heated
Amount is greater than diaphragm seal, driving force is passed to diaphragm seal by driving band, since driving band is located at diaphragm seal width direction center
The separate free end of line it is half side, therefore diaphragm seal free end under larger driving force effect by compression.Diaphragm seal installation
In on the radial direction partition of air preheater hot end, have the tendency that deforming with rotor partition in opposite (due on rotor partition after heated
Lower uneven heating and heated rear reduced stiffness, partition has the tendency that drooping down, and diaphragm seal is under the action of the first driving piece
Have the tendency that upturned).
Applicant it has been investigated that, it is above-mentioned first driving piece and diaphragm seal coefficient of thermal expansion differences and driving band deviate it is close
The distance of mounting width direction center line can significantly affect the heated rear upward amount of warpage of diaphragm seal, thus to air of the present invention
The using effect of the fixed self-compensation sealed piece of preheater makes a significant impact.
The above-mentioned fixed self-compensation sealed on piece of air preheater is equipped with mounting hole, is equipped with mounting hole for diaphragm seal, or
Diaphragm seal and the first driving on piece are equipped with mounting hole.
Above-mentioned mounting hole facilitates installation, can be provided with do not set on diaphragm seal the first driving piece part (correspondence it is above-mentioned
Diaphragm seal is equipped with mounting hole), part (the corresponding above-mentioned diaphragm seal for being located at diaphragm seal and the first driving piece overlapping can also be provided with
Mounting hole is equipped with the first driving on piece), it is preferably located at the part of diaphragm seal and the first driving piece overlapping.
Sealing system comprising the fixed self-compensation sealed piece of above-mentioned air preheater further includes air preheater hot end diameter
To partition, the fixed self-compensation sealed piece of air preheater is mounted on the radial direction partition of air preheater hot end, and pre- along air
Hot device rotor direction of rotation is followed successively by the first driving piece and diaphragm seal；The thickness of first driving piece is greater than the thickness of diaphragm seal.This
Sample, which can guarantee, will not further result in the first driving piece obvious deformation when mill is touched in diaphragm seal free end once in a while, to guarantee diaphragm seal
Opposite hot end radial direction partition remains to move freely.
The free end of above-mentioned sealing system, diaphragm seal is adjacent with fanning strip in upper namely free end.
For the size for improving above-mentioned driving force, as another preferred embodiment, the above-mentioned fixed self compensation of air preheater
Diaphragm seal further includes the second driving piece, and the second driving piece is consistent with the material of the first driving piece, structure snd size, and opposing seal
Piece is arranged symmetrically.
Air preheater hot end radial direction partition, preheater rotor center cylinder etc. are the common components of existing preheater；This
Application radially refers to rotor radial.
In order to realize that diaphragm seal does not follow rotor that the purpose of " mushroom " deformation occurs substantially, diaphragm seal is close to air preheat
One end of device rotor center cylinder is fixedly connected with hot end radial direction partition, and the other end is connected by limiting device and hot end radial direction partition
It connects, limiting device limits permission skidding distance of the diaphragm seal with respect to hot end radial direction partition, on the radial direction partition of hot end, air preheater
Fixed self-compensation sealed piece is radially in cantilever beam structure along air preheater rotor.
The fixed self-compensation sealed piece of the application air preheater is radially in cantilever beam structure along air preheater rotor, is hanged
The fixed point of arm girder construction is the point being fixedly connected with partition close to one end of rotor center cylinder, the application cantilever beam free end
Skidding distance be the limitation by limiting device namely the fixed self-compensation sealed piece of air preheater it is radial with respect to hot end every
Plate is only allowed within the scope of certain distance and slides, and is specifically dependent upon rotor mushroom deformation size.
Applicant it has been investigated that, only cantilever design is brought quiet plus partition deformation since intensity declines after being heated
Frictional force effect, diaphragm seal can also significantly droop down, and seal clearance is caused to expand；And there are the first driving piece or/and the second drive
When movable plate, diaphragm seal has the tendency that upturned under driving force effect, can eliminate the decline of above-mentioned intensity and stiction
It influences, and further upturned, until being constrained by above-mentioned limiting device, reaches preferable sealing state at this time.
Above-mentioned limiting device is set, and upturned amount may be excessive after on the one hand preventing diaphragm seal heated, causes and sector
Plate is pernicious to touch mill；On the other hand it prevents diaphragm seal because certain uncontrollable factor significantly droops downwards, causes seal clearance excessive, such as
Hit diaphragm seal of support rod etc. is fallen above air preheater.
Above-mentioned limiting device can be external hanging type position-limit mechanism, and (one end connects diaphragm seal, other end connection hot end radial direction
The movable part of partition), being also possible to caging bolt component, (its bolt hole for passing through hot end radial direction partition, plays guiding and limit
The double action of position), specific constructive form is not construed as limiting.
It is preferred that above-mentioned limiting device is limit bolt assembly, spacing shim is included at least, spacing shim and diaphragm seal are connected
(be directly connected or be connected indirectly by the first driving piece, it is preferred to use welding manner is connected), limit film is socketed on bolt, and
Opposite bolt can be movable in a certain range, and bolt is substantially stationary with respect to the position of hot end radial direction partition, therefore can limit close
The permission skidding distance of mounting and hot end radial direction partition.
In order to avoid error causes the heated rear and fanning strip of diaphragm seal to touch mill during design and installation, further increase close
Roll wheel assembly, roller group is arranged far from one end of air preheater rotor central tube in diaphragm seal in the stability for sealing gap control
Part includes at least idler wheel, and diaphragm seal free end 0.2-10mm is protruded apart from nearest the selecting of fanning strip in idler wheel outer surface.
It is preferred that above-mentioned rollers component includes idler wheel, ball, mandrel and bracket, mandrel passes through idler wheel, and ball is located at mandrel
Between idler wheel, bracket and mandrel are connected；Further preferably, above-mentioned ball is self-lubrication ceramic ball, to adapt to high temperature, dust
Environment.Further preferably, bracket is the baffle for being connected to mandrel axial ends, and the height of bracket is lower than the height of idler wheel,
I.e. the radial height of the bracket radial height (radius) that is lower than idler wheel, idler wheel are above bracket, and bracket, which plays, stablizes support
Effect, and the rolling of idler wheel will not be impacted.
It is preferred that roll wheel assembly and diaphragm seal welding are connected.
Applicant it has been investigated that, due to idler wheel outer surface apart from fanning strip it is nearest select protrusion diaphragm seal free end, when
Certain uncontrollable factors cause diaphragm seal abnormal deformation and then when diaphragm seal being caused to touch mill trend, idler wheel at first with fanning strip
Contact, so that diaphragm seal be avoided directly to contact with fanning strip；It is sliding contact between idler wheel and fanning strip, abrasion is effectively avoided to ask
Topic, and avoid and touch the air preheater rotor bite that mill may cause.Therefore, abovementioned technology improves sealing system work
The reliability of work.
To further simplify the structure, cost is reduced, while guaranteeing sealing performance, the fixed self compensation of air preheater is close
Part among mounting is clamped on the radial direction partition of air preheater hot end by guide blot component；Guide blot component includes
Bolt, the first elastic element, the first leak stopping gasket, the first nut and the second nut, the first elastic element of screw bolt passes,
The mounting hole and hot end radial direction partition of the fixed self-compensation sealed on piece of one leak stopping gasket, air preheater, and pass through the first spiral shell
Mother is fixed, and the second nut and the first nut are simultaneously tight, and the first elastic element is in non-fully compressive state.
Part among the above-mentioned fixed self-compensation sealed piece of air preheater refers to that aforementioned air preheater is fixed self-complementary
Repay the part between diaphragm seal one end and the other end.
In order to improve stability, above-mentioned sealing system further includes the second leak stopping gasket and the second elastic element, and bolt is successively
Across the first elastic element, the first leak stopping gasket, the fixed self-compensation sealed piece of air preheater, partition, the second leak stopping gasket
With the second elastic element, and fixed by the first nut, the second nut and the first nut and tight, the first elastic element and the second bullet
Property element is in non-fully compressive state.
First elastic element and the second elastic element are preferably the intermediate bell mouth shape for being equipped with mounting hole, i.e. butterfly gasket.
In order to guarantee that above-mentioned diaphragm seal is completely solid close to one end of air preheater rotor central tube and hot end radial direction partition
Fixed connection, diaphragm seal are welded with hot end radial direction partition using fixing bolt component close to one end of air preheater rotor central tube
The mode connect is fixedly connected.
For each radial partition, the above-mentioned fixed self-compensation sealed piece of air preheater is integral, along rotor diameter
To not allowing to be segmented, but in order to process and convenient in carrying, allow after segmental structure site welding again at being integral.
Fixed traditional diaphragm seal is to clamp to realize by multiple bolt assemblies radially, when mushroom occurs for rotor
When deformation, diaphragm seal also deforms therewith, the generation in the gap that causes to leak out, and only fixed one end close to central tube (passes the present invention
Diaphragm seal unite for convenience of transporting and installation, along it is radial be segmentation, it is general one section more than 1 meter, and the present invention must be along radial direction
Be it is whole, length can reach 4 meters or more), central tube one end is the fixed point of cantilever, and the other end does not become therewith when rotor deformation
Shape exists and with hot end radial direction partition deforms opposite trend.
The structure type of the application diaphragm seal is not especially limited, it is preferable that diaphragm seal is flat sheet, bending piece or ripple
Piece.
The technology that the present invention is not particularly limited is the prior art.
Applicant it has been investigated that, it is substantially to turn that from cold conditions to hot, " mushroom " deformation occurs air preheater for rotor
Sub-dividing plate has occurred deformation (upper edge of hot end partition and the spacing a of fanning strip sealing surface become larger), and the diaphragm seal of the application
After features described above installation in place, hardly following partition deformation, (the gap b of diaphragm seal free end and fanning strip sealing surface is hardly
Become), therefore the traditional triangle of air preheater can be eliminated and leaked out region, air leak rate of air preheater is significantly reduced, and compare it
His sealing technique, the application have at low cost, high reliablity, the comprehensive advantage of good seal performance.
Detailed description of the invention
Fig. 1 is the scheme of installation of the fixed self-compensation sealed piece of 1 air preheater of the embodiment of the present invention.
Fig. 2 is the fixed self-compensation sealed chip architecture schematic diagram of 1 air preheater of embodiment.
Fig. 3 is the composition schematic diagram of guide blot component in embodiment 1.
Fig. 4 is topology view (cold conditions) of the embodiment 1 along rotor direction of rotation.
Fig. 5 is topology view (hot) of the embodiment 1 along rotor direction of rotation.
Fig. 6 is the structure and position view that embodiment 1 drives band.
The spacing shim cold conditions scheme of installation that Fig. 7 includes by caging bolt component in embodiment 1.
Fig. 8 is the schematic diagram of the embodiment of the present invention 2.
Fig. 9 is the schematic diagram of the embodiment of the present invention 3.
Figure 10 is the schematic diagram of the embodiment of the present invention 4.
Figure 11 is the schematic diagram of the embodiment of the present invention 5.
Figure 12 is the position view of 5 idler wheel mechanism of the embodiment of the present invention.
Figure 13 is the structural schematic diagram of 5 idler wheel mechanism of the embodiment of the present invention.
In figure, 1 is diaphragm seal, and 2 be the first driving piece, and 3 be guide blot component, and 4 be rotor partition, and 5 be fanning strip, 6
It is spacing shim for fixing bolt component, 7,8 be the second driving piece；10 be limiting device installation site, and 11 be that position is welded and fixed
It sets, 12 be mounting hole, and 13 be driving band；21 be rotor direction of rotation, and 22 be rotor rotation axis, and 23 be diaphragm seal width direction
Center line；31 be bolt, and 32 be the first elastic element, and 33 be the first leak stopping gasket, and 34 be the first nut, and 35 be the second nut；
40 be idler wheel mechanism, and 41 be idler wheel, and 42 be ball, and 43 be mandrel, and 44 be bracket；A is upper edge and the fanning strip of hot end partition
The spacing of sealing surface, b be diaphragm seal free end and fanning strip sealing surface gap, c be limit diaphragm seal with respect to hot end radially every
The permission skidding distance of plate, d are to drive band to the distance of diaphragm seal width direction center line, and e is that idler wheel outer surface distance is fan-shaped
The nearest distance for selecting protrusion diaphragm seal free end of plate.
Specific embodiment
For a better understanding of the present invention, below with reference to the embodiment content that the present invention is furture elucidated, but it is of the invention
Content is not limited solely to the following examples.
Embodiment 1
As shown in Figure 1, the fixed self-compensation sealed piece of air preheater, including diaphragm seal and the first driving piece, diaphragm seal
For strip flat sheet, length 4600mm, the first driving piece is arranged along diaphragm seal length direction and is bonded with diaphragm seal solid
Even, the region that the first driving piece and diaphragm seal are connected is known as driving band；Driving band is located in diaphragm seal width direction far from freely
That holds is half side；Diaphragm seal and the first driving on piece are equipped with mounting hole namely mounting hole is located at diaphragm seal and the first driving piece overlapping
Part.The thermal expansion coefficient of diaphragm seal is smaller by about 40% than the thermal expansion coefficient of the first driving piece；In width direction, diaphragm seal
Width of the width of one end beyond the first driving piece, forms free end, and diaphragm seal drives the thickness of piece with a thickness of 2mm, first
For 4mm.
Above-mentioned first driving piece and being connected for diaphragm seal are connected to be dotted, and all connected points are located along the same line, composition
Band is driven, drives band and diaphragm seal width direction centerline parallel, and spacing is 18mm or so.
Sealing system comprising the fixed self-compensation sealed piece of above-mentioned air preheater further includes air preheater hot end diameter
To partition, the fixed self-compensation sealed piece of air preheater is mounted on the radial direction partition of air preheater hot end, and pre- along air
Hot device rotor direction of rotation is followed successively by the first driving piece and diaphragm seal；Diaphragm seal is close to one end of air preheater rotor central tube
It is fixedly connected and (is fixedly connected in such a way that fixing bolt component is welded with and connects) with hot end radial direction partition, and the other end passes through limit
Device is connect with hot end radial direction partition, and limiting device limits permission skidding distance of the diaphragm seal with respect to hot end radial direction partition, hot end
On radial partition, diaphragm seal is radially in cantilever beam structure along air preheater rotor；Limiting device is external hanging type connector, limit
One end connection diaphragm seal, the other end of device connect hot end radial direction partition；Among the fixed self-compensation sealed piece of air preheater
Part be clamped on the radial direction partition of air preheater hot end by guide blot component；Guide blot component includes bolt,
One elastic element, the first leak stopping gasket, the first nut, the second nut, the second leak stopping gasket and the second elastic element, bolt is successively
Across the first elastic element, the first leak stopping gasket first driving piece, diaphragm seal, partition, the second leak stopping gasket and the second elasticity member
Part, and fixed by the first nut and the first nut, the second nut and the first nut and tight, the first elastic element and the second elasticity
Element is in non-fully compressive state.
For each diaphragm seal, two mounting holes near air preheater rotor central tube install fixing bolt group
Part, and caging bolt component is installed farthest away from a mounting hole of air preheater rotor central tube, the installation of other mounting holes is led
To bolt assembly.
Embodiment 2
It is substantially the same manner as Example 1, except that: as shown in figure 8, diaphragm seal is bending piece.
Embodiment 3
It is substantially the same manner as Example 1, except that: as shown in figure 9, diaphragm seal is corrugated plate.
Embodiment 4
It is substantially the same manner as Example 1, except that: as shown in Figure 10, limiting device is limit bolt assembly, and air is pre-
The aperture of the corresponding mounting hole of the hot fixed self-compensation sealed on piece of device is greater than the outer diameter of bolt screw rod in caging bolt component, spiral shell
For bolt also cross hot end radial direction partition and the corresponding mounting hole of the fixed self-compensation sealed on piece of air preheater, bolt is relatively warm
Hold the position of radial partition to fix, diaphragm seal can opposed separators slid between screw rod and mounting hole.With embodiment 1 it is another not
It is the fixed self-compensation sealed piece of air preheater with place further include the second driving piece, the second driving piece drives piece with first
Material, structure snd size are consistent, and the second driving piece is arranged symmetrically with the first driving piece opposing seal piece.
Embodiment 5
It is substantially the same manner as Example 1, except that: as figs 11-13, in diaphragm seal far from air preheater rotor
Roll wheel assembly is arranged in one end of central tube, and roll wheel assembly both ends and diaphragm seal welding are connected, roll wheel assembly include idler wheel, ball,
Diaphragm seal free end 1mm is protruded apart from nearest the selecting of fanning strip in mandrel and bracket, idler wheel outer surface, and ball is self-lubrication ceramic rolling
Pearl, ball are located between mandrel and idler wheel, and bracket and mandrel are connected.
Embodiment 6
As shown in fig. 7, it is substantially the same manner as Example 4, except that: limiting device further includes spacing shim, limit pad
Limit hole is offered among piece, spacing shim is connected on the corresponding mounting hole of the fixed self-compensation sealed piece of air preheater,
The length of limit hole is less than the length of mounting hole, and the internal diameter of limit hole is greater than the outer diameter of bolt screw rod, and bolt is also cross hot end
The corresponding mounting hole of the fixed self-compensation sealed on piece of radial partition, air preheater and limit hole, bolt is with respect to hot end radial direction
The position of partition is fixed, such diaphragm seal can opposed separators slid between screw rod and limit hole.
By taking the 31VNT1950 type air preheater of HOWDEN company production as an example, quantization illustrates above-mentioned each example sealing system
Possessed compensation characteristic and the contribution reduced to air leak rate of air curtain: above-mentioned air preheater standard configuration conventional rigid diaphragm seal, hot end are fan-shaped
Plate fixation is non-adjustable, and general initial operation stage air leak rate of air curtain is up to design value 6%, wherein being leaked out caused by region as hot end radial direction triangle
Influence surpasses 3% (absolute value), the area about 0.15m that leaks out of the lateral fume side of air2(being equivalent to an internal diameter is 437mm pipeline
Sectional area), averagely leak out the super 12mm in gap；With the air preheater fixed self-compensation sealed piece generation in above-described embodiment 1-5
For conventional rigid diaphragm seal and bolt assembly, less than 2mm, air leak rate of air preheater is maintained at for a long time in the gap that can make averagely to leak out
3%-4% reaches world lead level, and at low cost, high reliablity.
Claims (13)
1. a kind of fixed self-compensation sealed piece of air preheater, it is characterised in that: including diaphragm seal and the first driving piece, sealing
Piece is strip, and the first driving piece is arranged along diaphragm seal length direction, and the first driving piece is bonded with diaphragm seal and is connected, and first drives
The region that movable plate and diaphragm seal are connected is known as driving band；In width direction, diaphragm seal one end is formed freely beyond the first driving piece
End, and it is half side far from free end in diaphragm seal width direction to drive band to be located at, the thermal expansion coefficient of the first driving piece is greater than close
The thermal expansion coefficient of mounting, the fixed self-compensation sealed on piece of air preheater are equipped with mounting hole.
2. the fixed self-compensation sealed piece of air preheater as described in claim 1, it is characterised in that: first driving piece with it is close
Being connected for mounting is connected to be dotted, and all connected points are located along the same line, and composition driving band drives band and diaphragm seal width side
To centerline parallel.
3. the fixed self-compensation sealed piece of air preheater as claimed in claim 1 or 2, it is characterised in that: further include second
Piece is driven, the second driving piece is consistent with the material of the first driving piece, structure snd size, and the second driving piece is opposite with the first driving piece
Diaphragm seal is arranged symmetrically.
4. the sealing system comprising the fixed self-compensation sealed piece of air preheater described in claim 1-3 any one,
It is characterized in that: further including air preheater hot end radial direction partition, the fixed self-compensation sealed piece of air preheater is mounted on air
On the radial direction partition of preheater hot end, and the first driving piece and diaphragm seal are followed successively by along air preheater rotor direction of rotation；First
The thickness of piece is driven to be greater than the thickness of diaphragm seal.
5. sealing system as claimed in claim 4, it is characterised in that: the fixed self-compensation sealed piece of air preheater leans on near-space
One end of air preheater rotor center cylinder is fixedly connected with hot end radial direction partition, and the other end is radial by limiting device and hot end
Partition connection, limiting device limit permission skidding distance of the diaphragm seal with respect to hot end radial direction partition, on the radial direction partition of hot end, air
The fixed self-compensation sealed piece of preheater is radially in cantilever beam structure along air preheater rotor, and diaphragm seal and first drives piece
It is integral along rotor radial, do not allow to be segmented.
6. sealing system as claimed in claim 5, it is characterised in that: among the fixed self-compensation sealed piece of air preheater
Part is clamped on the radial direction partition of air preheater hot end by guide blot component；Guide blot component includes bolt, first
Elastic element, the first leak stopping gasket, the first nut and the second nut, the first elastic element of screw bolt passes, the first collision mat
The mounting hole and hot end radial direction partition of the fixed self-compensation sealed on piece of piece, air preheater, and fixed by the first nut, the
Two nuts and the first nut are simultaneously tight, and the first elastic element is in non-fully compressive state.
7. such as sealing system described in claim 5 or 6, it is characterised in that: diaphragm seal is close to air preheater rotor central tube
One end be fixedly connected in such a way that fixing bolt component is welded with and connects with hot end radial direction partition.
8. such as sealing system described in claim 5 or 6, it is characterised in that: limiting device is external hanging type connector, limiting device
One end connection diaphragm seal, the other end connect hot end radial direction partition；Or limiting device is limit bolt assembly, air preheater
The aperture of the corresponding mounting hole of fixed self-compensation sealed on piece is greater than the outer diameter of bolt screw rod in caging bolt component, and bolt is same
When pass through hot end radial direction partition and the corresponding mounting hole of the fixed self-compensation sealed on piece of air preheater.
9. sealing system as claimed in claim 8, it is characterised in that: caging bolt component further includes spacing shim, limit pad
Limit hole is offered among piece, spacing shim is connected on the corresponding mounting hole of the fixed self-compensation sealed piece of air preheater,
The internal diameter of limit hole is greater than the outer diameter of bolt screw rod, and bolt is fixed self-complementary also cross hot end radial direction partition, air preheater
Repay corresponding mounting hole and limit hole on diaphragm seal.
10. the sealing system as described in claim 4-6 any one, it is characterised in that: further include idler wheel mechanism, idler wheel mechanism
Be located at the one end of diaphragm seal far from air preheater rotor central tube, and roll wheel assembly includes at least idler wheel, idler wheel outer surface away from
Nearest from fanning strip selects protrusion diaphragm seal free end 0.2-10mm.
11. sealing system as claimed in claim 7, it is characterised in that: further include idler wheel mechanism, idler wheel mechanism is located at diaphragm seal
Far from air preheater rotor central tube one end, and roll wheel assembly include at least idler wheel, idler wheel outer surface apart from fanning strip most
Close selects protrusion diaphragm seal free end 0.2-10mm.
12. sealing system as claimed in claim 8, it is characterised in that: further include idler wheel mechanism, idler wheel mechanism is located at diaphragm seal
Far from air preheater rotor central tube one end, and roll wheel assembly include at least idler wheel, idler wheel outer surface apart from fanning strip most
Close selects protrusion diaphragm seal free end 0.2-10mm.
13. sealing system as claimed in claim 9, it is characterised in that: further include idler wheel mechanism, idler wheel mechanism is located at diaphragm seal
Far from air preheater rotor central tube one end, and roll wheel assembly include at least idler wheel, idler wheel outer surface apart from fanning strip most
Close selects protrusion diaphragm seal free end 0.2-10mm.
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| CN2017101080581 | 2017-02-27 | ||
| CN201710108058 | 2017-02-27 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108413438B (en) * | 2018-04-17 | 2024-04-05 | 杭州新际能源科技有限公司 | Self-cleaning horizontal tubular air preheater |
| CN109489063A (en) * | 2018-11-05 | 2019-03-19 | 李暐 | Rotary regenerative air preheater encapsulating method, self-compensation sealed part and air preheater |
| CN110645359A (en) * | 2019-09-24 | 2020-01-03 | 航天科工哈尔滨风华有限公司电站设备分公司 | Mechanical self-correcting air preheater sealing device |
| CN111396916A (en) * | 2020-04-26 | 2020-07-10 | 四川辉胜至成电力工程有限公司 | Sealing device for hot end of air preheater |
| CN112032758A (en) * | 2020-09-22 | 2020-12-04 | 上海锅炉厂有限公司 | Hot end radial sealing device of self-adaptation air preheater rotor thermal deformation |
| CN112610978B (en) * | 2020-12-22 | 2023-03-24 | 南京市利澜电力节能科技有限公司 | Novel supporting structure of air preheater gasket |
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| US5540274A (en) * | 1994-12-06 | 1996-07-30 | Abb Air Preheater, Inc. | Rotary regenerative heat exchanger |
| US20130327495A1 (en) * | 2012-06-12 | 2013-12-12 | Nathan Hastings | Contact Seal System and Method for Rotary Air Ducts |
| CN205174433U (en) * | 2015-12-15 | 2016-04-20 | 神华集团有限责任公司 | Gasket, air heater and boiler system |
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| CN206669792U (en) * | 2017-02-27 | 2017-11-24 | 范诚豪 | A kind of fixed self-compensation sealed piece of air preheater and include its sealing system |
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| CN106705111A (en) | 2017-05-24 |
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Effective date of registration: 20190403 Address after: 210036 Southeast University, 2 Xuanwu District, Nanjing, Jiangsu 2 Patentee after: Nanjing platinum Energy Technology Co., Ltd. Address before: Room 301, No. 94, 1118 Lane, Changlin Road, Baoshan District, Shanghai, 2004 Patentee before: Fan Chenghao |
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Address after: Room 405, 101 Jiangbei Road, Gulou District, Nanjing City, Jiangsu Province Patentee after: Nanjing platinum Energy Technology Co., Ltd. Address before: 210036 Southeast University, 2 Xuanwu District, Nanjing, Jiangsu 2 Patentee before: Nanjing platinum Energy Technology Co., Ltd. |