CN102901118B - A kind of rotary regenerative air preheater flexible sealing structure - Google Patents
A kind of rotary regenerative air preheater flexible sealing structure Download PDFInfo
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- CN102901118B CN102901118B CN201210401280.8A CN201210401280A CN102901118B CN 102901118 B CN102901118 B CN 102901118B CN 201210401280 A CN201210401280 A CN 201210401280A CN 102901118 B CN102901118 B CN 102901118B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention discloses a kind of rotary regenerative air preheater flexible sealing structure, it is contact type sealing device, comprise sealing slide block, regulate supporting seat and support fixed head, be rotatably connected between sealing slide block and support fixed head, support fixed head and be relatively fixed on the radial dividing plate of air preheater; Supporting seat is regulated to be fixedly connected with support fixed head, regulate between supporting seat and sealing slide block and be provided with Compress Spring, fanning strip or the axial arc of sealing slide block and air preheater keep in touch state, reset adjusting device is provided with between sealing slide block and adjustment supporting seat, the two ends of reset adjusting device are respectively with sealing slide block with regulates supporting seat to be connected, for regulating at the maximum springback capacity sealing the Compress Spring between slide block and adjustment supporting seat.The present invention, by regulating reset adjusting device, realizes the adjustment of sealing force between moving component in air preheater and stationary parts, reduces the wearing and tearing of sealing surface, extends the service life of consumable accessory.
Description
Technical field
The present invention relates to steam power plant technical field, particularly a kind of rotary regenerative air preheater flexible sealing structure.
Background technology
In field of generating equipment, rotary regenerative air preheater is that the heat smoke that in thermal power plant, burning boiler afterbody is discharged heats a kind of heat-exchange device entering the air temperature of boiler auxiliary combustion, this device is by being contained in epitrochanterian large area heat transfer element, along with the rotation constantly of rotor, what replaced with the cold air entered by the heat of the heat smoke of discharge carries out heat exchange.Compared with tubular air preheater, rotary regenerative air preheater has compact conformation, volume is little, heat-transfer surface density is high, overall mass is light, metal consumption is few, be beneficial to mounting arrangements, the cold end corrosion features such as comparatively pipe heat exchanger is light, be suitable for using on large-sized boiler, but that the shortcoming of rotary regenerative air preheater is inleakage is large, operating mode is 6% ~ 8% time good, is 20% ~ 30% during poor sealing.Higher inleakage causes the reduction of pre-heater inlet blast, blower fan electric current raises, and the excess air coefficient after preheater raises, afterbody smoke discharging temperature drop is low, boiler thermal output reduces, coal-fired loss increases, and boiler does not reach rated load.
Rotary regenerative air preheater is a kind of rotating mechanism, is matched in clearance between the rotor of rotation and fixing air preheater body, and this gap certainly will be caused in air preheater exists certain air leakage phenomenon.Therefore air leakage phenomenon is one of structurally intrinsic attribute of rotary regenerative air preheater, is difficult to fundamentally avoid.Meanwhile, there is certain pressure reduction owing to flowing through between the heat smoke of air preheater and cold air, the air leak rate of air curtain of above-mentioned air leakage phenomenon also also exists the trend of extension.Therefore, the air leak rate of air curtain of air preheater mainly reduces by current technological improvement as much as possible.Leak out to control radial direction, traditional settling mode is generally install autotracker additional on the hot junction of rotor, to adjust the gap between Sectorial sealplate and sealing leaf.When then more employing is in cold conditions for the cold junction of rotor preset clearance, when hot, make the solution in gap gradually up.After adopting structure so, the radial seal structure in the hot junction of rotor can automatically regulate under various operating mode, and the gap between Sectorial sealplate and sealing leaf is in slave mode at work.But due to autotracker probe residing for environment poor, faults frequent, makes the electric current of air preheater easily occur the phenomenon of fluctuation.And after tip damage, the hot end seal plate of rotor can only be in pressure raised position, increases the air leak rate of air curtain of air preheater further.In addition, because autotracker has the many shortcomings in trouble point, therefore the maintenance cost of whole adjustment system is high, and maintenance is large.In addition, the fixed radial sealing structure of rotor cold junction can make the dynamic clearance of unit at full capacity time reach minimum of a value, but along with the reduction of unit load, after the deflection of rotor reduces gradually, the dynamic clearance of rotor cold junction constantly increases, air leak rate of air curtain can constantly increase thereupon, forms technical contradiction.And excessive air leakage can produce serious negative effect to the runnability of unit and the thermal efficiency.Describe from above, the gap between both reductions done one's utmost by traditional air preheater hermetically-sealed construction under often all focusing on and ensureing sealing leaf and the discontiguous prerequisite of sealing plate, thus reduces inleakage.But what traditional Sealing Technology adopted is all contactless hard sealing structure, because air preheater root diameter is larger, especially for present Large-scale machine set, the diameter of air preheater rotor can reach 16 meters ~ 17 meters, for such huge monster, even if rotor runs under being in metastable operating mode, the circumferential temperature of rotor is also different everywhere, the distortion of same rotor is also uneven, and rotor distortion is in this case uncontrollable all the time, and above-mentioned gap is a dynamic clearance.Therefore, according to contactless hard seal form, even if hermetically-sealed construction is accurate again, between sealing leaf and sealing plate, intrinsic gap will be there is all the time.In addition, due to air preheater rotor at different temperature deflection be also gradual change, therefore traditional fixed hermetically-sealed construction is in a certain specific operation lower seal best results, and operating mode to be leaked out obviously increase once change.
Chinese patent literature CN201425316Y discloses a kind of contact type sealing structure being applied to rotary regenerative air heater, for sealing the dynamic clearance in air preheater between movement parts and static element; As shown in Figure 1, hermetically-sealed construction at least comprises seal, the filiform that seal comprises body and is fixed on body, becomes tufted to arrange; Filiform comprises the fixed end part for being connected with body, and has flexible free end portion; Seal is fixedly connected with in static element with movement parts by body, and the free end portion of filiform keeps in touch state by means of elasticity with another in movement parts and static element.By the position of dynamic clearance in air preheater being arranged the filiform of the arrangement in tufted, flow behavior in the filiform utilizing air to arrange in tufted and the elastic characteristic of filiform, achieve the object reducing air preheater air leakage rate, this sealing was applied on steam turbine originally, and effect is pretty good, but air preheater due to rotating speed lower, be difficult to form packing, therefore, sealing effectiveness is limited, and wire is softening fast, holds time short.
In order to improve sealing effectiveness, reduce air leak rate of air curtain, " CSEE's annual meeting in 2009 " discloses one section of paper---" 300MW rotary air preheater air leak case study and countermeasures ", disclose a kind of sealing structure of rotary regenerative air preheater in the text, as shown in Fig. 2 structure, comprise sealing slide block, to protect watt, spring composition and spring supporting seat composition, the two ends of spring act on respectively to be protected watt and on spring supporting seat, sealing slide block and fanning strip form and are tightly connected, under the reseting elasticity of Compress Spring, make sealing slide block and fanning strip be in sealing state all the time, to protect watt because the reseting elasticity of Compress Spring all acts on, after long-play, Compress Spring can become lax, and then the sealing slackened between sealing slide block and fanning strip, increase air leak rate of air curtain.
Summary of the invention
In order to solve Compress Spring of the prior art sealing effectiveness technical problem worse and worse after longtime running, realize sealing steady in a long-term between moving component in air preheater and stationary parts, embodiments provide a kind of rotary regenerative air preheater flexible sealing structure.
Described technical scheme is as follows:
A kind of rotary regenerative air preheater flexible sealing structure, it is contact type sealing device, comprise sealing slide block, regulate supporting seat and support fixed head, be rotatably connected between described sealing slide block and described support fixed head, described support fixed head is fixed on the radial dividing plate of air preheater relatively; Described adjustment supporting seat is fixedly connected with described support fixed head, Compress Spring is provided with between described adjustment supporting seat and described sealing slide block, fanning strip or the axial arc of described sealing slide block and air preheater keep in touch state, reset adjusting device is provided with between described sealing slide block and described adjustment supporting seat, the two ends of described reset adjusting device are respectively with described sealing slide block with regulate supporting seat to be connected, for regulating the maximum springback capacity of the described Compress Spring between described sealing slide block and described adjustment supporting seat.
Described reset adjusting device comprises a Limit screw, regulates bearing and adjusting nut, described adjustment bearing is fixedly connected with described support fixed head, described adjustment bearing forms adjustment elongated hole, one end of described Limit screw is fixedly connected with described sealing slide block, its other end is through described adjustment elongated hole, and described adjusting nut is arranged at the free end of described Limit screw.
Described reset adjusting device is at least provided with two, and it is uniform setting along described sealing its length direction, and one end of described Limit screw is connected with described sealing slide block is vertical.
Described contact type sealing device comprises two groups, and it is arranged at the rotor radial and axially of air preheater respectively.
Described hermetically-sealed construction also comprises the brush seal installation that the radial dividing plate along air preheater is arranged, and described brush seal installation and described sealing slide block are placed in the radial dividing plate both sides of air preheater;
Described brush seal installation comprises filiform and installation component, and described installation component is relative with the radial dividing plate of air preheater to be fixedly connected with, and described filiform is detachably fixedly connected with described installation component.
Described installation component comprises fixed head and tightening piece, and one end of described fixed head is fixedly connected with the radial dividing plate of air preheater, and described filiform is fixed on described fixed head by described tightening piece.
Described fixed head shaping one installs clip slot along its length after bending, and one end of described filiform is arranged in described installation clip slot, is fixedly connected with between described filiform with described fixed head by described tightening piece.
Described filiform is made up of the wire arranged in tufted, described wire is through 180 ° of annular stiff ends of doubling aftershaping one, described annular stiff end to be arranged in described installation clip slot and with described installation clip slot tight fit connection, fanning strip or the axial arc of described free end wiry and air preheater keep in touch state.
Described installation component also comprises a folder and silk pressing bar, and described silk pressing bar runs through described annular stiff end, and the stiff end of the described filiform of described silk folder clamping, for fitting in described silk pressing bar by described filiform.
Described brush seal installation comprises two groups, and it is arranged at the rotor radial and axially of air preheater respectively.
The beneficial effect that technical scheme provided by the invention is brought is:
(1) by arranging reset adjusting device in contact type sealing device, according to running time and the gap length between sealing situation adjustment sealing slide block and adjustment supporting seat, make the Compress Spring active force acted on sealing slide block keep moderate, and then make the sealing function that produces between sealing slide block and fanning strip or axial arc moderate.In running, by adjusting reset adjusting device, thus ensure that the stabilized seal of air preheater in During Process of Long-term Operation.
(2) the present invention also add a kind of brush seal installation on the basis of contact seal, two kinds of sealing means are adopted to realize its sealing effectiveness complementary, double sealing overcomes single wire brush seal installation and to hold time short shortcoming, can maintain good sealing effectiveness the long period; Single brush seal installation does not become lower air leak rate of air curtain, and normal use has the air leak rate of air curtain of about 6%, and brush seal installation and contact type sealing device combine, and are formed organically complementary, and air leak rate of air curtain can be reduced to 2-4%, energy efficiency is remarkable.
(3) adopt spring technology, allow the rotor of air preheater to have certain face deformation under hot running status.In addition, rotor, under hot shaping, also can produce larger face deformation and torsional deformation, and this Sealing Technology can make up the deformation defect of rotor well.
(4) flexible contact sealing is very little with fanning strip contact force, and the material of sealing block own is self-lubrication alloy, and at high temperature dry friction coefficient μ is 0.1, affects very little so the sealing that is in operation contacts the resistance caused on drive motors electric current.Adopt that this transformation can not to rotor-drive and rotor structure be stressed has an impact.
(5) retrofit work amount is little, and maintenance craft simplifies.Flexible contact type seal reconstruction does not need to change air preheater shell, rotor structure etc., require to reduce to the ovality of rotor, the depth of parallelism, flatness, rotor jerk value etc. of both ends of the surface simultaneously, simplify the process of site operation, the duration is short, effective.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is brush seal installation generalized section disclosed in patent document CN201425316Y;
Fig. 2 is contact type sealing device generalized section of the prior art;
Fig. 3 is the structural profile schematic diagram of one embodiment of the invention when being applied in air preheater rotor radial seal;
Fig. 4 is the structural profile schematic diagram that one embodiment of the invention is applied in when air preheater rotor axial seals;
Fig. 5 is the flexible contact type sealing schematic diagram of superposing type flexible seal device of the present invention;
Fig. 6-1 is the A-A generalized section of Fig. 5;
Fig. 6-2 is B-B generalized sections of Fig. 5;
Fig. 6-3 is C-C generalized sections of Fig. 5;
Fig. 7 is brush seal installation structural representation provided by the present invention;
Fig. 8 is the left side schematic diagram of Fig. 7;
Fig. 9 is the invention process operating mode schematic diagram in cold conditions when air preheater rotor hot junction;
Figure 10 practices shown in Fig. 9 when air preheater rotor hot junction at hot operating mode schematic diagram;
Figure 11 is the invention process operating mode schematic diagram in cold conditions when air preheater rotor cold junction;
Figure 12 practices shown in Figure 11 when air preheater rotor hot junction at hot operating mode schematic diagram.
In figure: 1-fanning strip; 2-sealing surface; 3-dynamic clearance; 4-diaphragm seal; The radial dividing plate of 5-;
6-contact type sealing device, 61-seals slide block, and 62-supports fixed head, and 63-regulates supporting seat, 631-spring fixed tray, 64-Compress Spring, and 65-spring is presented a theatrical performance as the last item on a programme, 66-drop in leaf, 67-hinge, the capping of 68-hinge, 69-dog screw;
7-brush seal installation, 71-filiform, 72-tightening piece, 73-fixed head, 74-installing plate, 75-silk presss from both sides, 76-silk pressing bar, and 77-installs clip slot; 8-bolt;
9-reset adjusting device, 91-Limit screw, 92-regulates bearing, and 921-regulates elongated hole, 93-adjusting nut;
The axial arc of 10-.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Be a specific embodiment of the present invention as shown in Figure 3, Figure 4.
Be applied to the superposing type flexible seal device of rotary regenerative air preheater radial direction, mainly comprise and be arranged on flexible contact type sealing device 6 between fanning strip 1 and rotor radial dividing plate 5 and brush seal installation 7.Contact type sealing device 6 and brush seal installation 7 are fixedly connected with the radial dividing plate 5 of rotor by bolt 8, and contact type sealing device 6 here can arrange separately and be used as sealing certainly.
Due in rotary regenerative air preheater, be the relation of gyration between rotor and housing, therefore between the former working end to diaphragm seal 4 and the sealing surface 2 of fanning strip 1, there is a dynamic clearance 3.
As Fig. 5, Fig. 6-1, Fig. 6-2 and Fig. 6-3 is depicted as the structural representation of flexible contact type sealing device 6 one specific embodiment.Contact type sealing device 6 mainly comprises adjustment supporting seat 63, hinge 67, hinge capping 68, sealing slide block 61, supports fixed head 62 and Compress Spring 64, sealing slide block 61 is hinged with regulating one end of supporting seat 63 by hinge 67, its other end is fixed by the bolt 8 radial dividing plate 5 with air preheater, the two ends of Compress Spring 64 respectively with sealing slide block 61 with support fixed head 62 and be fixedly connected with.By dog screw 69, drop in leaf 66 is fixedly connected with sealing slide block 61 on the non-tight face of sealing slide block 61 in figure, drop in leaf 66 is fixedly connected with hinge 67, and under the effect of Compress Spring 64, drop in leaf 66 can be with movable sealing slide block 61 to rotate around hinge.In order to better dismantle Compress Spring 64 and fix, spring drop in leaf 66 is provided with spiral presents a theatrical performance as the last item on a programme 65, one end of Compress Spring 64 is placed on spring and presents a theatrical performance as the last item on a programme fixing on 65, meanwhile, the spring screwed part of presenting a theatrical performance as the last item on a programme on 65 to be spun on sealing slide block 61 and to be fixed on drop in leaf 66 by sealing slide block 61.
In order to better realize the control to the maximum springback capacity of Compress Spring 64, the present invention is provided with reset adjusting device 9 between sealing slide block 61 and adjustment supporting seat 63, mainly comprise Limit screw 91, regulate bearing 92 and adjusting nut 93, regulate on bearing 92 and form adjustment elongated hole 921, one end of Limit screw 91 is fixedly connected with sealing slide block 61, its other end is through adjustment elongated hole 921, adjusting nut 93 is arranged at the free end of Limit screw 91, the adjustment of the maximum rebound height of Compress Spring 64 is realized by turn adjusting nut 93, thus the maximum auto-compensation amount of adjustment sealing slide block 61, realize regulating the sealing of dynamic clearance 3.
Adjustment supporting seat 63 is also provided with spring fixed tray 631, one end of Compress Spring 64 is inserted in spring fixed tray 631, the other end be inserted in threaded spring present a theatrical performance as the last item on a programme 65 cylindrical boss, leaned by Compress Spring 64 pairs of drop in leafs 66, thus to sealing slide block 61 carry out auto-compensation.
Be the structural representation of brush seal installation 7 one specific embodiment as shown in Figure 7, Figure 8.
Brush seal installation 7 wherein mainly comprises filiform 71 and installation component, and installation component is relative with the radial dividing plate 5 of air preheater to be fixedly connected with, and filiform 71 is detachably fixedly connected with installation component.
Installation component wherein comprises fixed head 73 and tightening piece 72, and one end of fixed head 73 is fixedly connected with the radial dividing plate 5 of air preheater, and filiform 71 is fixed on fixed head 73 by tightening piece 72; Fixed head 73 shaping one installs clip slot 77 along its length after bending, and one end of filiform 71 is arranged at installs in clip slot 77, and be fixedly connected with by tightening piece 72 between filiform 71 with fixed head 73, tightening piece 72 is here holding screw.Filiform 71 is wherein made up of the wire arranged in tufted, wire is through 180 ° of annular stiff ends of doubling aftershaping one, annular stiff end be arranged at install in clip slot 77 and with installation clip slot 77 tight fit connection, the fanning strip 1 of free end wiry and air preheater or the sealing surface of axial arc 10 keep in touch state.
Installation component also comprises a folder 75 and silk pressing bar 76, and silk pressing bar 76 runs through annular stiff end, and the stiff end of silk folder 75 clamping filiform 71, for filiform 71 is fitted in silk pressing bar 76, makes soft brush, prevent soft brush from coming off in the process of motion.
Length wiry can carry out free adjustment according to cold conditions gap.Consider that the deflection of the mushroom deformation characteristic rotor center of rotor and rotor edge is inconsistent, in manufacturing process, length wiry can also change along filiform 71 length direction, the deflection at rotor center cylinder place is little, and length wiry also suitably reduces; Rotor periphery deflection is large, and the wire length being arranged on outer fringe position suitably increases.Fineness wiry and the quantity of composition filiform 71 can be determined according to actual conditions.The support fixed head 62 of flexible contact type sealing device 6 is fixedly connected with the radial dividing plate 5 of rotor with the installing plate 74 of brush seal installation 7, the corresponding dynamic clearance 3 of free end portion of the sealing slide block 61 of contact type sealing device 6 and the filiform 71 of brush seal installation 7 is arranged, to seal corresponding gap.The installation of contact type sealing device 6 and brush seal installation 7 can adopt welding, holding screw according to on-site actual situations or be arranged on the radial dividing plate 5 of air preheater, rotor diaphragm or hoop brace summer by methods such as set square reinforcings.
Be respectively the present invention one specific embodiment as shown in Figure 9, Figure 10 when air preheater hot end of rotor at cold conditions, hot operating mode schematic diagram.In figure, under three kinds of operating modes, dynamic clearance is respectively X1, X2, by the change of cold-hot state, and X1 > X2.Be respectively as shown in Figure 11, Figure 12 Fig. 9, embodiment illustrated in fig. 10 when air preheater rotor cold junction at cold conditions, hot operating mode schematic diagram.In figure, under three kinds of operating modes, dynamic clearance 3 is respectively Sl, S2, by the change of cold-hot state, and Sl>S2.During cold conditions, rotor deformation is zero, and rotor is in level, and the dynamic clearance X1 in hot junction is 0, and the dynamic clearance S1 of cold junction is in maximum.The Compress Spring 64 being now arranged on the contact type sealing device 6 in hot junction is in depth-compression state, and its sealing slide block 61 fanning strip 1 of fitting rotates, and the free end portion of the filiform 71 of brush seal installation 7 is in degree of depth case of bending laminating fanning strip 1 and rotates.The contact type sealing device 6 and brush seal installation 7 deflection that are now arranged on cold junction are minimum, the Compress Spring 64 of contact type sealing device 6 is in micro-compressive state, its sealing slide block 61 fanning strip 1 of fitting rotates, and the free end portion of the filiform 71 of brush seal installation 7 is in microbend state laminating fanning strip 1 and rotates.
Time hot, along with temperature is more and more higher, the continuous distortion of hot end of rotor, be arranged on Compress Spring 64 resilience gradually of the contact type sealing device 6 in hot junction, but its sealing slide block 61 fanning strip 1 of fit all the time rotates, the free end portion of the filiform 71 of brush seal installation 7 also gradually resilience and all the time laminating fanning strip 1 rotate.Along with the dynamic clearance X2 in hot junction reaches maximum, contact type sealing device 6 and brush seal installation 7 deflection minimum, the Compress Spring 64 of contact type sealing device 6 is in micro-compressive state, its sealing slide block 61 fanning strip 1 of fitting rotates, and the free end portion of the filiform 71 of brush seal installation 7 is in microbend state laminating fanning strip 1 and rotates.Along with temperature is more and more higher, also constantly being out of shape of rotor cold junction, the Compress Spring 64 being arranged on the contact type sealing device 6 in hot junction compresses gradually, its sealing slide block 61 fanning strip 1 of fit all the time rotates, the free end portion of the filiform 71 of brush seal installation 7 also gradually bending and all the time laminating fanning strip 1 rotate.When the dynamic clearance of cold junction is reduced into minimum of a value S2, the Compress Spring 64 being in the contact type sealing device 6 of cold junction is in depth-compression state, its sealing slide block 61 fanning strip 1 of fitting rotates, and the free end portion of the filiform 71 of brush seal installation 7 is in degree of depth case of bending laminating fanning strip 1 and rotates.
As can be seen from the difference of above accompanying drawing, when unit higher load is run, along with the deflection of rotor strengthens, the seal being in hot end of rotor compensate for hot junction cold conditions preset clearance and rotates along the direction of motion of rotor in its natural state, and the seal being in rotor cold junction is rotated along the direction of motion of rotor by the sealing surface being close to fanning strip after compressing.Unit comparatively underrun time, rotor deformation reduces gradually, the seal being in hot end of rotor is rotated along the direction of motion of rotor by the sealing surface being close to sealing plate after compressing, the seal being in rotor cold junction compensate for cold conditions preset clearance, and the direction of motion in its natural state along rotor is rotated.Structure of the present invention is simple, easy to process, it is little to invest, there is great flexibility and feasibility, in different specific embodiments, axial, radial, the either direction of air preheater can be arranged on respectively according to the position at scene and situation of leaking out, or two directions are installed simultaneously, and can ensure that rotor can fit tightly sealing surface in any operating mode lower seal wherein.In addition, the installation of this kind of hermetically-sealed construction and using the original hermetically-sealed construction of equipment without any impact, original diaphragm seal 4 can retain completely, even if seal has part wears and comes off in long running, also do not affect the original hermetically-sealed construction of air preheater, the sealing property of air preheater is far superior to original hermetically-sealed construction.
Current rotary regenerative air preheater is mostly equipped with hot junction or cold junction autotracker, adopt seal of the present invention and original sealing plate autotracker with the use of more obtaining the effect brought out the best in each other, inleakage can not only be reduced further, simultaneously because there has been the stop of seal suitably can amplify the tracking gap of sealing plate autotracker, make air preheater running current more steady, improve the security of equipment.
In addition, cannot come into operation even if sealing plate autotracker breaks down in running, the overall air leak rate of air curtain of air preheater still can remain within a quite low level the stop of leaking out by seal.Contact type sealing device provided by the present invention has good adaptivity, can according to the degree of crook automatic regulating gap of seal.It should be noted that, seal owing to contacting sealing surface all the time, certainly exists wearing and tearing at running.According to the current transformation situation to air preheater, only within 3 months, just improvement cost can be reclaimed.Actual service condition shows, the rate of wear of seal can catch up with the repair schedule of equipment completely, only needs to carry out part replacing according to abrasion condition to seal during each maintenance down.Therefore it is completely acceptable for being used as attrition component by seal provided by the present invention.After seal reconstruction has been carried out to a rotary regenerative air preheater, Xi'an thermal technology institute is entrusted to show the performance test results that it carries out: air leak rate of air preheater A, B both sides are all far below guarantee value, air leak rate of air curtain is about 4.0%, reaches China and to put into operation at present the highest level of boiler.As can be seen here, this hermetically-sealed construction transformation carried out air preheater achieves the effect of highly significant, has captured the difficult problem to the so large-scale rotatable parts sealing of being heated of air preheater, has made its operation level reach level leading in the world.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a rotary regenerative air preheater flexible sealing structure, it is contact type sealing device (6), comprise sealing slide block (61), regulate supporting seat (63) and support fixed head (62), be rotatably connected between described sealing slide block (61) and described support fixed head (62), described support fixed head (62) is fixed on the radial dividing plate (5) of air preheater relatively; Described adjustment supporting seat (63) is fixedly connected with described support fixed head (62), Compress Spring (64) is provided with between described adjustment supporting seat (63) and described sealing slide block (61), fanning strip (1) or the axial arc (10) of described sealing slide block (61) and air preheater keep in touch state, it is characterized in that:
Reset adjusting device (9) is provided with between described sealing slide block (61) and described adjustment supporting seat (63), the two ends of described reset adjusting device (9) are respectively with described sealing slide block (61) with regulate supporting seat (63) to be connected, for regulating the maximum springback capacity of the described Compress Spring (64) be positioned between described sealing slide block (61) and described adjustment supporting seat (63);
Described reset adjusting device (9) comprises a Limit screw (91), regulates bearing (92) and adjusting nut (93), described adjustment bearing (92) is fixedly connected with described support fixed head (62), described adjustment bearing (92) forms and regulates elongated hole (921), one end of described Limit screw (91) is fixedly connected with described sealing slide block (61), its other end is through described adjustment elongated hole (921), and described adjusting nut (93) is arranged at the free end of described Limit screw (91);
Described reset adjusting device (9) is at least provided with two, and it is uniform setting along described sealing slide block (61) length direction, and one end of described Limit screw (91) is connected with described sealing slide block (61) is vertical.
2. rotary regenerative air preheater flexible sealing structure according to claim 1, is characterized in that:
Described contact type sealing device (6) comprises two groups, and it is arranged at the rotor radial and axially of air preheater respectively.
3. rotary regenerative air preheater flexible sealing structure according to claim 1 and 2, is characterized in that:
Described hermetically-sealed construction also comprises the brush seal installation (7) that the radial dividing plate (5) along air preheater is arranged, and described brush seal installation (7) and described sealing slide block (61) are placed in radial dividing plate (5) both sides of air preheater;
Described brush seal installation (7) comprises filiform (71) and installation component, described installation component is relative with the radial dividing plate (5) of air preheater to be fixedly connected with, and described filiform (71) is detachably fixedly connected with described installation component.
4. rotary regenerative air preheater flexible sealing structure according to claim 3, is characterized in that:
Described installation component comprises fixed head (73) and tightening piece (72), one end of described fixed head (73) is fixedly connected with the radial dividing plate (5) of air preheater, and described filiform (71) is fixed on described fixed head (73) by described tightening piece (72).
5. rotary regenerative air preheater flexible sealing structure according to claim 4, is characterized in that:
Described fixed head (73) shaping one installs clip slot (77) along its length after bending, one end of described filiform (71) is arranged in described installation clip slot (77), is fixedly connected with between described filiform (71) with described fixed head (73) by described tightening piece (72).
6. rotary regenerative air preheater flexible sealing structure according to claim 5, is characterized in that:
Described filiform (71) is made up of the wire arranged in tufted, described wire is through 180 ° of annular stiff ends of doubling aftershaping one, described annular stiff end to be arranged in described installation clip slot (77) and with described installation clip slot (77) tight fit connection, fanning strip (1) or the axial arc (10) of described free end wiry and air preheater keep in touch state.
7. rotary regenerative air preheater flexible sealing structure according to claim 6, is characterized in that:
Described installation component also comprises a folder (75) and silk pressing bar (76), described silk pressing bar (76) runs through described annular stiff end, described silk folder (75) clamps the stiff end of described filiform (71), for described filiform (71) is fitted in described silk pressing bar (76).
8. rotary regenerative air preheater flexible sealing structure according to claim 7, is characterized in that:
Described brush seal installation (7) comprises two groups, and it is arranged at the rotor radial and axially of air preheater respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210401280.8A CN102901118B (en) | 2012-10-19 | 2012-10-19 | A kind of rotary regenerative air preheater flexible sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210401280.8A CN102901118B (en) | 2012-10-19 | 2012-10-19 | A kind of rotary regenerative air preheater flexible sealing structure |
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| CN102901118B true CN102901118B (en) | 2015-10-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103111809B (en) * | 2013-02-06 | 2015-04-08 | 张建华 | Brush-type seal simplified manufacturing method |
| CN103195929B (en) * | 2013-04-27 | 2016-03-30 | 四川东能节能技术有限公司 | Be applied to the automatic expansion compensation diaphragm seal in rotary regenerative air preheater hot junction |
| CN106090989B (en) * | 2016-08-09 | 2017-12-26 | 洛阳瑞昌石油化工设备有限公司 | A kind of elastic pressuring clamping device for plate air preheater |
| 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 |
| CN113883949B (en) * | 2021-10-25 | 2023-06-06 | 河北西柏坡第二发电有限责任公司 | Rotary air preheater self-adjusting sealing device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201425316Y (en) * | 2009-05-18 | 2010-03-17 | 冯伟忠 | Contact type sealing structure applied to rotary air pre-heater |
| CN201705932U (en) * | 2010-03-24 | 2011-01-12 | 沈阳瑞源电力设备工程技术有限公司 | Flexible contact sealing device |
| CN202884978U (en) * | 2012-10-19 | 2013-04-17 | 南京通用电气装备有限公司 | Rotary air preheater flexible sealing structure |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201425316Y (en) * | 2009-05-18 | 2010-03-17 | 冯伟忠 | Contact type sealing structure applied to rotary air pre-heater |
| CN201705932U (en) * | 2010-03-24 | 2011-01-12 | 沈阳瑞源电力设备工程技术有限公司 | Flexible contact sealing device |
| CN202884978U (en) * | 2012-10-19 | 2013-04-17 | 南京通用电气装备有限公司 | Rotary air preheater flexible sealing structure |
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