CN103195929B - Be applied to the automatic expansion compensation diaphragm seal in rotary regenerative air preheater hot junction - Google Patents
Be applied to the automatic expansion compensation diaphragm seal in rotary regenerative air preheater hot junction Download PDFInfo
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- CN103195929B CN103195929B CN201310150918.XA CN201310150918A CN103195929B CN 103195929 B CN103195929 B CN 103195929B CN 201310150918 A CN201310150918 A CN 201310150918A CN 103195929 B CN103195929 B CN 103195929B
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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
Be applied to the automatic expansion compensation diaphragm seal in rotary regenerative air preheater hot junction, comprise fixing seal sheet and be arranged on the thermo-bimetal's diaphragm seal group on fixing seal sheet, described thermo-bimetal's diaphragm seal group comprises multiple thermo-bimetal's diaphragm seal structure, described thermo-bimetal's diaphragm seal structure comprises the bulge be connected with fixing seal sheet and the elastomeric seal portions be arranged on above bulge, and described bulge is move towards consistent strip TM18 alloy with rotor radial; Under normal temperature, the sealed department overhead height of described thermo-bimetal's diaphragm seal structure is lower than fixing seal sheet overhead height.The automatic expansion compensation diaphragm seal being applied to rotary regenerative air preheater hot junction of the present invention, adopt composite structure, make up rotor due to the gap producing mushroom deformation increase that is heated, reduce the area that leaks out that rotor deformation produces, leaking out when effectively can reduce heat exchange, improves heat exchange efficiency.
Description
Technical field
The invention belongs to thermal technology field, relate to rotary regenerative air preheater structure, particularly a kind of automatic expansion compensation diaphragm seal being applied to rotary regenerative air preheater hot junction.
Background technique
Rotary regenerative air preheater utilizes the flue gas heat of boiler tail to add the equipment of hot air, the heat in flue gas is utilized to add hot air, air temperature is raised, temperature of exhaust fume reduces, and decrease the smoke exhaust heat loss of boiler, air sends into boiler after being heated simultaneously, stove fuel is made to catch fire rapidly, burning is completely strong, thus decreases machinery and the loss of the inadequacy burning for chemistry mechanics reason of fuel, improves efficiency of boiler.
The working principle of rotary preheater on the current path entering high-temperature flue gas and Cryogenic air, arranges a large rotor as physical thermal exchanger, when rotor rotates to high temperature side, from rotor from smoke absorption heat, when rotor rotates to low temperature side, transfer heat to the air of low temperature.
High temperature gas flow path and the low-temperature airflow path of rotary regenerative air preheater cross at rotor place, and rotor operationally must ceaselessly rotating heat transfer, inevitably produce between high temperature side and low temperature side and reveal air-flow, the pressure difference of high temperature side and low temperature side more exacerbates this airflow leaks.Leakage area between effective control high temperature side and low temperature side is the key reducing amount of leakage.
In prior art, the rotating part of rotary regenerative air preheater adopts many group diaphragm seals to seal in radial direction, and each diaphragm seal is that geometrical center is symmetric in radial direction with rotor axis.But in the operation process of rotary regenerative air preheater, the high-temperature flue-gas that boiler produces can up to more than 350 degrees Celsius, mushroom deformation is there is in rotor after by high-temperature flue gas heating, as shown in Fig. 1 to 2, rotor 8, in radial directions away from the ends sag of rotor axis 1, produces the bevel gap 3 that width successively decreases between rotor driven and sealed stator 2, distance rotor axis is far away, gap is larger, and near axle center, gap is less.CN200920216427.X discloses a kind of spring controlled compound seal sheet, but and the unresolved sealing problem to above-mentioned bevel gap.
Summary of the invention
Rotor is heated to produce the bevel gap shutoff situation that mushroom deformation causes undesirable for overcoming conventional art, reduce the technological deficiency of air preheater working efficiency, the invention provides a kind of automatic expansion compensation diaphragm seal being applied to rotary regenerative air preheater hot junction.
The automatic expansion compensation diaphragm seal being applied to rotary regenerative air preheater hot junction of the present invention, comprise fixing seal sheet and be arranged on the thermo-bimetal's diaphragm seal group on fixing seal sheet, described thermo-bimetal's diaphragm seal group comprises multiple thermo-bimetal's diaphragm seal structure, described thermo-bimetal's diaphragm seal structure comprises the bulge be connected with fixing seal sheet and the elastomeric seal portions be arranged on above bulge, and described bulge is move towards consistent strip TM18 alloy with rotor radial; Under normal temperature, the sealed department overhead height of described thermo-bimetal's diaphragm seal structure is lower than fixing seal sheet overhead height.
Preferably, the bulge of each thermo-bimetal's diaphragm seal structure and the link position of fixing seal sheet are positioned on the different heights of fixing seal sheet, and the length of each bulge increases with the increase with rotor axis distance.
Preferably, each thermo-bimetal's diaphragm seal structure is identical, and the expansion height of each thermo-bimetal's diaphragm seal structure and the increase of rotor axis distance and increase.
Preferably, described bulge comprises the strip TM18 alloy different from least two length connected bottom sealed department, and the strip TM18 alloy that wherein length is shorter is the closer to rotor axis.
Concrete, described bulge has two strip TM18 alloys.
Preferably, at normal temperatures, the sealed department overhead height of described thermo-bimetal's diaphragm seal structure is lower than the height difference Y=B+C-A of fixing seal sheet overhead height; Wherein A is the expansion height of bulge, and B is the rotor axial amount of deformation of relevant position, and C is scratch resistant allowance, and C is 10-20 millimeter.
Further, A=K* (Δ T-TG), wherein K is TM18 alloy nature expansion rate coefficient, and Δ T is the front and back temperature difference that expands, and TG is the counteract gravity forces temperature of sign diaphragm seal weight.
Further, TG=60 degree Celsius.
Preferably, described strip TM18 alloy-coated has thermal-protective coating.
Preferably, described thermo-bimetal's diaphragm seal group is arranged on latter half of away from rotor axis of fixing seal sheet.
Adopt the automatic expansion compensation diaphragm seal being applied to rotary regenerative air preheater hot junction of the present invention, adopt composite structure, thermo-bimetal's diaphragm seal can adjust diaphragm seal height automatically according to the change of flue-gas temperature, make up rotor due to the gap producing mushroom deformation increase that is heated, reduce the area that leaks out that rotor deformation produces, leaking out when effectively can reduce heat exchange, improves heat exchange efficiency.
Accompanying drawing explanation
Fig. 1 illustrates the schematic diagram of air preheater rotor generation mushroom deformation;
Fig. 2 illustrates that conventional seals sheet is pulled the schematic diagram producing bevel gap after being heated by the mushroom deformation of rotor;
Fig. 3 illustrates the schematic diagram before a kind of embodiment undeformed of the present invention;
Fig. 4 illustrates the schematic diagram after a kind of embodiment deformation of the present invention;
Fig. 5 illustrates that the sealed department overhead height of thermo-bimetal's diaphragm seal structure in the present invention calculates schematic diagram lower than the height difference of fixing seal sheet overhead height;
Fig. 6 illustrates a kind of embodiment schematic diagram of fixing seal sheet of the present invention and thermo-bimetal's diaphragm seal structure;
In each figure, reference character name is called: 1. rotor axis 2. sealed stator 3. bevel gap 4. conventional seals sheet 5. fixing seal sheet 6. sealed department 7. bulge 8. rotor 9. fixing bolt.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The existing conventional seals sheet 4 of air pre-heater sealing structure is arranged on rotor 8, be consistent at down fixing and rotor plane of rotation, fit with sealed stator as far as possible, but ensure certain interval to make rotor energy smooth rotation, this excesssive gap then strengthens the gas leakage of high-temperature flue gas and Cryogenic air, the too small sealed stator in gap easily and diaphragm seal scratch.Fixing this gap lower is consistent with design load, but the rotor of rotary regenerative air preheater is after being subject to high-temperature flue gas heating, and rotor produces distortion at axial direction, the outer rim of rotor is sagging, as shown in Figure 2, produce bevel gap 3 between conventional seals sheet 4 and sealed stator, gas leakage area increases.
The automatic expansion compensation diaphragm seal being applied to rotary regenerative air preheater hot junction of the present invention, comprises fixing seal sheet and is arranged on the thermo-bimetal's diaphragm seal group on fixing seal sheet.
Described thermo-bimetal's diaphragm seal group comprises multiple thermo-bimetal's diaphragm seal structure, described thermo-bimetal's diaphragm seal structure comprises the bulge be connected with fixing seal sheet and the elastomeric seal portions be arranged on above bulge, and described bulge is move towards consistent strip TM18 alloy with rotor radial; Under fixing, the sealed department overhead height of described thermo-bimetal's diaphragm seal structure is lower than fixing seal sheet overhead height.
At the initial operation stage of air preheater, rotor does not produce deformation, the sealing of high temperature side and fixed side relies on fixing seal sheet to stop and leaks gas, along with temperature increases, rotor is heated generation mushroom deformation gradually, away from the edge droop in axle center, be arranged on the bevel gap producing gas leakage between epitrochanterian fixing seal sheet and sealed stator.
The thermo-bimetal's diaphragm seal group be arranged on fixing seal sheet is made up of multiple thermo-bimetal's diaphragm seal structure, each thermo-bimetal's diaphragm seal structure comprises bulge and elastomeric seal portions, elastomeric seal portions is arranged on above bulge, bulge is strip TM18 alloy, along with the temperature of air preheater rises, the temperature distortion of TM18 alloy is expanded, because the trend of bulge moves towards consistent with rotor radial, the expansion deformation that bulge produces mainly concentrates on rotor axial direction, bulge is upwards arched upward, the position being arranged on the sealed department above bulge with on move, as shown in the figure, after sealed department moves, compensate for the bevel gap between fixing seal and sealed stator after rotor mushroom deformation, reduce gas leakage area.
Due to the mushroom deformation of shape faster than rotor of being heated of TM18 alloy, therefore, under normal temperature, the sealed department overhead height of thermo-bimetal's diaphragm seal structure must lower than fixing seal sheet overhead height, after keeping from heat, bulge rapid expanding makes sealed department emerge, and scratches with sealed stator.
TM18 alloy is a kind of known bimetallic alloy material, in the ASTMB-388 standard that American society association announces, following regulation is done to the weight percent composition of the material of TM18 alloy: nickeliferous 19.4%, carbon containing 0.5%, containing chromium 2.25%, all the other compositions are iron.
When rotor is heated and mushroom deformation occurs, distance rotor axis distance is more sagging more obvious, and in distance rotor axis, gap is larger more at a distance.Therefore for reaching best obstruct gap effect, thermo-bimetal's diaphragm seal, should higher than the diaphragm seal height after the bulge distortion near rotor axis place away from the diaphragm seal height after the bulge distortion at rotor axis place when being heated.
Two kinds of solutions can be adopted for reaching above-mentioned effect, scheme one is that the bulge of each thermo-bimetal's diaphragm seal structure is positioned on the phase co-altitude of fixing seal sheet with the link position of fixing seal sheet, and the length of each bulge increases with the increase with rotor axis distance.The TM18 alloy of bulge is when being heated, expansion height is relevant to bulge length, bulge length is longer, expanded by heating height is higher, rotor is maximum away from the distortion of axle center place, therefore the thermal expansion length away from axle center place is longer, highly higher after expansion, to adapt to the moderate finite deformation gap away from axle center place.As Fig. 3, before not being out of shape, each thermo-bimetal's diaphragm seal structure installment is at the phase co-altitude of fixing seal sheet, and the bulge length away from thermo-bimetal's diaphragm seal structure of rotor axis is longer; As accordingly, after generation deformation, shown in Fig. 4, the thermo-bimetal's diaphragm seal expansion height away from rotor axis is higher, makes sealed department lifting heights higher, with shutoff away from wider gap, rotor axis place, reaches preferably sealing effect.
Scheme two is that each thermo-bimetal's diaphragm seal structure is identical, namely the bulge length of each thermo-bimetal's diaphragm seal structure is identical, and the height of the bulge of each thermo-bimetal's diaphragm seal structure and the link position of fixing seal sheet increases with the increase with rotor axis distance.When expansion height is identical, because mounting point height is different, the diaphragm seal away from axle center place can stop larger deformation gap, plays and stops gas leakage effect preferably.
Thermo-bimetal's diaphragm seal structure of the present invention is made up of bulge and elastomeric seal portions, and bulge can be a TM18 alloy, also can be two or more TM18 alloy, and the strip TM18 alloy that wherein length is shorter is the closer to rotor axis.
Adopt above-mentioned thermo-bimetal's diaphragm seal structure, when expanded by heating, the TM18 alloy bar expansion height that length is longer is higher, make diaphragm seal higher away from rotor axis one end lifting heights, because the gap produced away from axle center place rotor deformation is wider, therefore this thermo-bimetal's diaphragm seal structure can better stop gas leakage.The simplest implementation is the TM18 alloy that employing two length are different, and be connected to lower front part and the rear end of the close rotor axis of diaphragm seal, the TM18 alloy bar being wherein connected to front end is shorter.
Preferably, thermo-bimetal's diaphragm seal group is arranged on latter half of away from rotor axis of fixing seal sheet, in practice, the bevel gap that the mushroom deformation of rotor produces is larger in the periphery of rotor, inner very little, negligible near rotor axis place deformation quantity, therefore thermo-bimetal's diaphragm seal group only can be arranged on latter half of away from rotor axis of fixing seal sheet, such as only be arranged on half or 1/3rd places of radial direction radius, to reduce costs.
Be applied in the air preheater operation process of the automatic expansion compensation diaphragm seal in rotary regenerative air preheater hot junction with of the present invention, rotor and diaphragm seal are heated generation deformation simultaneously, because materials and structures is different, the speed of deformation of rotor is much slower than the speed of deformation of TM18 alloy bar in diaphragm seal.If the deformation quantity that TM18 alloy bar produces is greater than the deformation quantity of same time rotor, the sealed department of thermo-bimetal's diaphragm seal structure is made to exceed cold bimetallic (spring cone) seal sheet height, come in contact with sealed stator most probably and scratch, blow down diaphragm seal, internal rotor structure is damaged.Because fixing seal sheet to be fixed on rotor and the temperature characteristic of the temperature characteristic of material and rotor is similar to, can be similar to and to think that the deformation of fixing seal sheet is consistent with the deformation of rotor.Comprehensively described above, at normal temperatures, the sealed department overhead height of described thermo-bimetal's diaphragm seal structure should lower than fixing seal sheet overhead height, the time difference of rotor and thermo-bimetal's diaphragm seal structure generation deformation is offset with height difference, make TM18 alloy bar when there is deformation, scratch the deformation quantity that the deformation quantity that will reach is greater than rotor generation, thus reach the effect synchronously making up the gap that the mushroom-shaped deformation of rotor produces.
The calculating of above-mentioned height difference as shown in Figure 5, for clearly demonstrating principle, the schematic diagram being applied to the fixing seal sheet of the automatic expansion compensation diaphragm seal in rotary regenerative air preheater hot junction and the sealed department of thermo-bimetal's diaphragm seal of the present invention is only drawn, the height relationships of main both expressions in figure.Fig. 5 left-half is the sealed department height relationships that the fixing seal sheet before deformation and thermo-bimetal's diaphragm seal group occur, and the top of sealed department and the overhead height difference of fixing seal sheet are Y.Right half part is the height relationships of fixing seal sheet and sealed department after being heated, and because rotor produces mushroom deformation, produces axial deflection B, drives fixing seal sheet to produce shift length B downwards; The short transverse displacement of diaphragm seal is that D, D are affected by the expansion height A of bulge and rotor axial amount of deformation B two-part factor of relevant position, i.e. D=A-B.As seen from Figure 4, Y=D+C=A+C-B.
Wherein C is scratch resistant allowance, sealed department is caused to exceed fixing seal sheet excessive height for bulge parectasis after preventing from being heated and sealed stator scratches, certain scratch resistant allowance must be set, preferably choose scratch resistant allowance C and be 10 to 20 millimeters, be preferably 15 millimeters.The axial deflection B of rotor and rotor structure, material with running time gas flow temperature relevant, can by calculating or in advance experiment measuring obtain.The expansion height A of bulge can draw by precalculating.Obtaining A and B by measuring, and rule of thumb to define with alignment error etc. scratch resistant allowance, the overhead height that can obtain the sealed department top of thermo-bimetal's diaphragm seal structure and fixing seal sheet is poor.
In Practical Calculation process, when the calculating of above-mentioned expansion height A needs to consider that bulge expands, the weight of diaphragm seal is on the impact of expanding.Because diaphragm seal is arranged on the top of bulge, the own gravity of diaphragm seal vertically downward, contrary with the expansion direction of bulge, expanded containment is acted on, according to the existing research to TM18 alloy material, what can be similar to thinks that strip TM18 alloy is when naturally expanding, and natural expansion height H and temperature variation Δ T is proportional, and natural expansion rate coefficient is K; I.e. H=K* Δ T.Inventor finds in the research process to thermo-bimetal's diaphragm seal structure of the present invention, when high temperature side flue-gas temperature is 300 to 350 degrees Celsius, can adopt following approximate relation to the calculating of A: A=K* (Δ T-TG).Wherein TG parameter is the counteract gravity forces temperature characterizing diaphragm seal weight, for the correction of expanding to TM18 alloy, illustrate the impact of diaphragm seal weight on bulge expansion height, when high temperature side flue-gas temperature is 350 degrees Celsius, TG preferably can get 60 degrees Celsius, better can embody the impact of diaphragm seal weight on expansion height.
Preferably, to the strip TM18 alloy as bulge, outside can be coated with thermal-protective coating, described thermal-protective coating only can be coated on the top that is heated of TM18 alloy, also can wrap up whole strip TM18 alloy, to obtain best effect of heat insulation, slow down the speed of deformation of TM18 alloy.
As Fig. 6 illustrates the schematic diagram of a kind of embodiment in rotor radial cross section of the automatic expansion compensation diaphragm seal of rotary regenerative air preheater of the present invention, the moving direction of rotor banding motive sealing sheet when black thick arrow in top represents operation in Fig. 6.The inclination angle contrary with diaphragm seal moving direction is arranged at fixing seal sheet top, to reduce resistance of air when running, fixing seal sheet 5 lee face is provided with thermo-bimetal's diaphragm seal structure, the bulge 7 of thermo-bimetal's diaphragm seal structure is connected with fixing seal sheet 5 bottom, sealed department 6 is fixed with above bulge, sealed department height is lower than fixing seal sheet height, and fixing seal sheet and sealed department can adopt 304 stainless steel manufactures.Fixing seal sheet, bulge and rotor are fixed together by bolt 9.
Adopt the automatic expansion compensation diaphragm seal of rotary regenerative air preheater of the present invention, thermo-bimetal's diaphragm seal can adjust diaphragm seal height automatically according to the change of flue-gas temperature, make up rotor due to the gap producing mushroom deformation increase that is heated, reduce the area that leaks out that rotor deformation produces, leaking out when effectively can reduce heat exchange, improves heat exchange efficiency.
Further, thermo-bimetal's diaphragm seal structure adopts different setting height(from bottom)s or different bulge TM alloy length, with the bevel gap that the outer imperial palace adapting to mushroom deformation generation is little, plays better sealing effect.
Further, thermo-bimetal's diaphragm seal structure itself can adopt many TM18 alloy combination as bulge, makes single thermo-bimetal's diaphragm seal structure produce different height displacement in radial directions, better shutoff bevel gap.
Further, the height difference of thermo-bimetal's diaphragm seal structure and fixing seal sheet needs to consider the allowance after expanding, and is blown down by stator to avoid the sealed department after expanding.Preferably, in the calculating of this height difference, the bulge deformation caused diaphragm seal weight is offset to be similar to and is selected 60 degrees Celsius, while reaching better actual effect, simplify computational process.
Adopt the bulge of TM18 alloy that thermal-protective material can be used coated, to delay the speed of expansion of bulge further, avoid diaphragm seal to be blown down.
The present invention is in the air preheater being applied to 300 megawatts and 600 megawatt generation units, when ensureing that unit works well, the air leak rate of air curtain of air preheater controls all the time below 3%, greatly be better than the technical merit of similar technique 8 ~ 12%, for 600 megawatt units, owing to improve sealing effect, reduce air leak rate of air curtain, can save standard coal about 3000 tons every year, reduce electric energy loss more than 3,600,000 degree, direct economic benefit can reach annual 4000000 yuan.Simultaneously because air leak rate of air curtain reduces, tail flue gas discharge amount reduces, and reduces tail part exhaust purification cost, can reduce discharging flue gas 2,000,000 tons every year, obtain huge environmental benefit.
Previously described is each preferred embodiment of the present invention, preferred implementation in each preferred embodiment is if not obviously contradictory or premised on a certain preferred implementation, each preferred implementation can stack combinations use arbitrarily, design parameter in described embodiment and embodiment is only the invention proof procedure in order to clear statement inventor, and be not used to limit scope of patent protection of the present invention, scope of patent protection of the present invention is still as the criterion with its claims, the equivalent structure change that every utilization specification of the present invention and accompanying drawing content are done, in like manner all should be included in protection scope of the present invention.
Claims (10)
1. be applied to the automatic expansion compensation diaphragm seal in rotary regenerative air preheater hot junction, comprise fixing seal sheet (5) and be arranged on the thermo-bimetal's diaphragm seal group on fixing seal sheet, it is characterized in that:
Described thermo-bimetal's diaphragm seal group comprises multiple thermo-bimetal's diaphragm seal structure, described thermo-bimetal's diaphragm seal structure comprises the bulge (7) be connected with fixing seal sheet and the elastomeric seal portions (6) be arranged on above bulge, and described bulge is move towards consistent strip TM18 alloy with rotor radial; Wherein, the weight percent composition of TM18 alloy material is: nickeliferous 19.4%, carbon containing 0.5%, and containing chromium 2.25%, all the other compositions are iron;
Under normal temperature, the elastomeric seal portions overhead height of described thermo-bimetal's diaphragm seal structure is lower than fixing seal sheet overhead height.
2. be applied to the automatic expansion compensation diaphragm seal in rotary regenerative air preheater hot junction as claimed in claim 1, it is characterized in that: bulge (7) and the link position of fixing seal sheet of each thermo-bimetal's diaphragm seal structure are positioned on the phase co-altitude of fixing seal sheet (5), and the length of each bulge increases with the increase with rotor axis (1) distance.
3. be applied to the automatic expansion compensation diaphragm seal in rotary regenerative air preheater hot junction as claimed in claim 1, it is characterized in that: each thermo-bimetal's diaphragm seal structure is identical, and the height of the bulge of each thermo-bimetal's diaphragm seal structure and the link position of fixing seal sheet increases with the increase with rotor axis distance.
4. be applied to the automatic expansion compensation diaphragm seal in rotary regenerative air preheater hot junction as claimed in claim 1, it is characterized in that: described bulge (7) comprises the strip TM18 alloy different from least two length that elastomeric seal portions (6) bottom connects, and the strip TM18 alloy that wherein length is shorter is the closer to rotor axis (1).
5. be applied to the automatic expansion compensation diaphragm seal in rotary regenerative air preheater hot junction as claimed in claim 4, it is characterized in that: described bulge has two strip TM18 alloys.
6. be applied to the automatic expansion compensation diaphragm seal in rotary regenerative air preheater hot junction as claimed in claim 1, it is characterized in that: at normal temperatures, the elastomeric seal portions overhead height of described thermo-bimetal's diaphragm seal structure is lower than the height difference Y=B+C-A of fixing seal sheet overhead height;
Wherein A is the expansion height of bulge, and B is the rotor axial amount of deformation of relevant position, and C is scratch resistant allowance, and C is 10-20 millimeter.
7. be applied to the automatic expansion compensation diaphragm seal in rotary regenerative air preheater hot junction as claimed in claim 6, it is characterized in that:
A=K* (Δ T-TG), wherein K is TM18 alloy nature expansion rate coefficient, and Δ T is the front and back temperature difference that expands, and TG is the counteract gravity forces temperature of sign diaphragm seal weight.
8. be applied to the automatic expansion compensation diaphragm seal in rotary regenerative air preheater hot junction as claimed in claim 7, it is characterized in that: TG=60 degree Celsius.
9. be applied to the automatic expansion compensation diaphragm seal in rotary regenerative air preheater hot junction as claimed in claim 1, it is characterized in that: described strip TM18 alloy-coated has thermal-protective coating.
10. be applied to the automatic expansion compensation diaphragm seal in rotary regenerative air preheater hot junction as claimed in claim 1, it is characterized in that: described thermo-bimetal's diaphragm seal group is arranged on latter half of away from rotor axis (1) of fixing seal sheet (5).
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| CN201310150918.XA CN103195929B (en) | 2013-04-27 | 2013-04-27 | Be applied to the automatic expansion compensation diaphragm seal in rotary regenerative air preheater hot junction |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104913330B (en) * | 2015-05-07 | 2017-05-24 | 四川东能节能技术有限公司 | Air preheater and hot-end radial sealing device thereof |
| CN107270321A (en) * | 2017-08-04 | 2017-10-20 | 四川大智工程技术有限公司 | A kind of intelligent sealing system of air preheater |
| CN113803740B (en) * | 2021-09-08 | 2024-04-09 | 大唐蒲城发电有限责任公司 | Air leakage prevention sealing device for rotor of air preheater |
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| CN1228505A (en) * | 1998-03-06 | 1999-09-15 | 东芝株式会社 | Sealing device for axial flow turbine |
| US6640752B1 (en) * | 2003-03-07 | 2003-11-04 | Alstom (Switzerland) Ltd | Boiler and regenerative air preheater arrangement to enhance SO3 capture |
| CN201373423Y (en) * | 2009-03-19 | 2009-12-30 | 杨祥良 | Sealing device for air preheater |
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