CN101629726A - Radial seal assembly for hot end of rotor of rotary air preheater - Google Patents
Radial seal assembly for hot end of rotor of rotary air preheater Download PDFInfo
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- CN101629726A CN101629726A CN200910306091A CN200910306091A CN101629726A CN 101629726 A CN101629726 A CN 101629726A CN 200910306091 A CN200910306091 A CN 200910306091A CN 200910306091 A CN200910306091 A CN 200910306091A CN 101629726 A CN101629726 A CN 101629726A
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- diaphragm seal
- expansion
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- sealing
- seal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The invention discloses a radial seal assembly for a hot end of a rotor of a rotary air preheater, comprising a sealing sheet, an expansion assembly and an installation structure, wherein the middle of the sealing sheet is provided with a folding section; the expansion assembly comprises an upper expansion component and a lower expansion component, one end of the upper expansion component is fixedly connected with one end of the lower expansion component, a spacing block is arranged between the other end of the upper expansion component and the other end of the lower expansion component, both of the expansion components are fixedly connected with the spacing block, the upper expansion component is welded onto the sealing sheet on the folding section, and the expansion coefficient of lower expansion component is higher than that of the upper expansion component; and the sealing sheet is installed on a radial spacing board of the hot end of the rotor of the rotary air preheater by the installation structure. The invention has the advantages of simple structure, low cost, good sealing effect and good reliability.
Description
Technical field
The present invention relates to a kind of radial seal assembly that is used for the hot end of rotor of rotary regenerative air preheater.
Background technology
At present, rotary regenerative air preheater is the auxiliary equipment that large-size thermal power plant and chemical industry must be joined, its main application is exactly to utilize the flue gas of boiler tail to come the heats cold air, provide hot-air to boiler, its rotor carries heating surface uniform rotation in equipment, the high-temperature flue gas of boiler tail passes air preheater from top to down and is positioned at the rotating rotor heating surface of fume side under air-introduced machine attracts, heating surface is heated thus, and flue gas is cooled; When heated heating surface rotates to air side, cold air passes heating surface from lower to upper under pressure fan promotes, absorb heat and form hot-air, and the heating surface that is cooled rotates to fume side again and is heated, go round and begin again thus, reciprocation cycle, provide hot-air to boiler continuously.。
Because rotary regenerative air heater is applied in boiler cigarette-wind system simultaneously, air and flue gas are because of rotary regenerative air heater UNICOM, the malleation of air and the negative pressure of flue gas are in equipment and form pressure reduction, therefore must have sealing device in the equipment, under differential pressure action, leak to fume side by all gaps to stop hot-air.And the heating surface rotor to take place with the central shaft under temperature action be peripheral downward " mushroom " thermal deformation of axis, the hot junction apex seal of former routine uses bolted on the rotor radial dividing plate, therefore also bottom offset thereupon, seal clearance in the air preheater between diaphragm seal and the hot junction fanning strip increases thereupon and causes leakage, therefore make the air of the draw heat flue that bleeds, cause thermal waste, exhaust gas volumn to strengthen discharging, boiler can't normally move because of lacking wind simultaneously;
Afterwards, the sealing tracking technique in air preheater rotor hot junction had been invented by the U.S. one company, it adopts be the hot junction fanning strip under electronic displacement sensor guides, follow the tracks of rotor " mushroom " thermal deformation, reduce seal clearance automatically, leak out thereby reduce.Because hot junction fanning strip pursuit movement makes the interior sealing mechanism of equipment very complicated, the guide of more too busy to get away electronic displacement sensor, because Device memory acutely washing away at 300～400 ℃ of temperature fields and flue gas, therefore its fault rate height, the sealing system devoting rate is low, cause leak out bigger than normal.
At present domestic a kind of novel sealing technology appears again: contact seal, and the apex seal that is loaded on hot end of rotor is made hinge-type and is supported with spring, and diaphragm seal is tightly scraped the fanning strip sealing surface during work under spring action, reduces dynamic and static seal clearance; This Sealing Technology is to lean on the rotation and the spring of diaphragm seal hinge to be compressed and contact seal, if be to reach seal request at normal temperatures, but baking for a long time under 400 ℃ the operating condition in air preheater, the sealing hinge was easily lost efficacy easily by the elasticity of hot " killing ", spring, and contact seal will be worn and torn in addition.Thereby influencing its sealing property, sealing reliability is relatively poor.
Summary of the invention
The objective of the invention is to above-mentioned deficiency, a kind of radial seal assembly for hot end of rotor of rotary regenerative air preheater be provided at prior art, it have simple in structure, cost is low, the advantage of good sealing effect, good reliability.
For achieving the above object, the radial seal assembly for hot end of rotor of rotary regenerative air preheater of the present invention comprises diaphragm seal, it is characterized in that also comprising expansion assembly and mounting structure; The middle part of described diaphragm seal is provided with folded section, expansion assembly comprises upper and lower expansion element, one end of two expansion elements connects firmly, be provided with spacing block between the other end of the two, two expansion elements all connect firmly with spacing block, wherein go up on the diaphragm seal that expansion element is welded in folded section top, the coefficient of expansion of following expansion element is greater than last expansion element; The hot end of rotor that diaphragm seal is loaded on air preheater by mounting structure is radially on the dividing plate.
Above-mentioned mounting structure can be for being located at several chute on the diaphragm seal of folded section below, being loaded on bolt and clamp nut in the corresponding chute; By bolt and clamp nut expansion assembly and diaphragm seal directly are loaded on hot end of rotor radially on the dividing plate;
Above-mentioned mounting structure also can be the sealing backup plate, the sealing gripper shoe of bending, protect the cover plate at flap and two ends outward, wherein seal the side that backup plate is positioned at diaphragm seal, sealing gripper shoe and protect flap outward by two or more Bolt Connection and be positioned at the opposite side of diaphragm seal, and the two one of them installing hole corresponding with bolt is elongated hole longitudinally, top outer protects flap and diaphragm seal and welds and connect firmly, the sealing gripper shoe of below and sealing backup plate, and diaphragm seal is equipped with chute several correspondence and that be positioned at diaphragm seal folded section below, the sealing gripper shoe, sealing backup plate and diaphragm seal pass the bolt of corresponding chute separately by several, and the hot end of rotor that clamp nut is loaded on air preheater is radially on the dividing plate, the cover plate at two ends will be by the sealing backup plate, seal gripper shoe and protect the port closed that flap is formed outward, expansion assembly and diaphragm seal folded section are positioned at by the sealing backup plate, the sealing gripper shoe, protect outward in the cavity that the cover plate at flap and two ends forms; Can avoid the interior dust of boiler flue to enter cavity contacts with the diaphragm seal folded section with expansion assembly;
During use: black box is contained in hot end of rotor radially on the dividing plate, makes diaphragm seal and top
The hot junction fanning strip between keep 1 mm clearance, and the upper and lower expansion element end that is provided with spacing block is near the hot end of rotor center-side of dividing plate radially, an end that connects firmly is near the hot end of rotor outer edge of dividing plate radially; Run duration is with the rising of flue-gas temperature, " mushroom " thermal deformation takes place in rotor, because folded section is deployable, the rotor of thermal deformation draws back folded section, the lower semisection that makes diaphragm seal is to bottom offset, expand after expansion assembly is heated simultaneously, because the length of the last expansion element expansion of expansion element is bigger down, thereby last expansion element tension, following expansion element is to arch, expansion assembly is distortion upwards, similar " arch of bow and arrow ", offset diaphragm seal under the deadweight effect flexural deformation and the first half to bottom offset, make the above the first half diaphragm seal of folded section keep level, make that the gap between the hot junction fanning strip of diaphragm seal and top is constant, therefore play the sealing function of hot operational excellence; Because temperature descends, the rotor of temperature distortion, expansion assembly, diaphragm seal all recover ortho states after air preheater is shut down.
As a further improvement on the present invention, also be provided with several piece intermediate isolating plate between the upper and lower expansion element of described expansion assembly, intermediate isolating plate and the welding of last expansion element connect firmly; To the stress point of last expansion element, the deformed shape of expansion element and diaphragm seal in the more accurate control improves sealing effectiveness in the time of can increasing distortion;
In sum, the present invention has cancelled device such as hinge-type diaphragm seal and spring in complicated mechanism such as electronic displacement sensor in the sealing tracking technique and the contact seal, and be metalwork entirely, in the operating mode applicable to high temperature, high dust, have simple in structure, cost is low, the advantage of good sealing effect, good reliability.
Description of drawings
Fig. 1 is the front view of the embodiment of the invention one.
Fig. 2 is the left view of Fig. 1.
Fig. 3 is the front view of the embodiment of the invention two partial cutaway.
Fig. 4 is the left view among Fig. 3 behind the dismounting left cover.
Fig. 5 is the front view of diaphragm seal among Fig. 3.
Fig. 6 is the left view of Fig. 5.
Fig. 7 is the front view of expansion assembly among Fig. 3.
Fig. 8 is the left view of Fig. 7.
Fig. 9 is the front view of sealing backup plate among Fig. 3.
Figure 10 is the front view of sealing gripper shoe among Fig. 3.
Figure 11 is the left view of Figure 10.
Figure 12 protects the front view of flap at home and abroad for Fig. 3.
Figure 13 is the left view of Figure 12.
Figure 14 is the front view of the embodiment of the invention two user modes.
The specific embodiment
The present invention is further illustrated below in conjunction with accompanying drawing.
Embodiment one
By illustrated in figures 1 and 2, the radial seal assembly for hot end of rotor of this rotary regenerative air preheater comprises diaphragm seal 1, expansion assembly 2 and mounting structure; The middle part of described diaphragm seal 1 is provided with folded section 1a, expansion assembly 2 comprises upper and lower expansion element 2a and 2b, one end of two expansion elements connects firmly by bolt (not shown) and welding, be provided with spacing block 2c between the other end of the two, two expansion element 2a and 2b all connect firmly with spacing block 2c welding, between upper and lower expansion element 2a and 2b, also be provided with several piece intermediate isolating plate 3, intermediate isolating plate 3 connects firmly with last expansion element 2a welding, wherein go up on the diaphragm seal 1 that expansion element 2a is welded in folded section 1a top, the coefficient of expansion of following expansion element 2b is greater than last expansion element 2a; Mounting structure is to be located at several chute 4 on the diaphragm seal 1 of folded section 1a below, to be loaded on bolt 5 and clamp nut 6 in the corresponding chute; By bolt 5 and clamp nut 6 expansion assembly 2 and diaphragm seal 1 directly are loaded on hot end of rotor radially on the dividing plate 7;
During use: black box is contained in hot end of rotor radially on the dividing plate 7, make and keep 1 mm clearance between the hot junction fanning strip of diaphragm seal 1 and top, and the end that upper and lower expansion element 2a and 2b are provided with spacing block 2c is near the hot end of rotor center-side of dividing plate 7 radially, and an end that connects firmly is near the hot end of rotor outer edge of dividing plate 7 radially; Run duration is with the rising of flue-gas temperature, " mushroom " thermal deformation takes place in rotor, because folded section 1a is deployable, the rotor of thermal deformation draws back folded section 1a, the lower semisection that makes diaphragm seal 1 is to bottom offset, expand after expansion assembly 2 is heated simultaneously, because the length of the last expansion element 2a expansion of expansion element 2b is bigger down, thereby last expansion element 2a tension, following expansion element 2b is to arch, upwards distortion of expansion assembly 2, similar " arch of bow and arrow ", offset diaphragm seal 1 under the deadweight effect flexural deformation and the first half to bottom offset, make the above the first half diaphragm seal of folded section 1a keep level, make that the gap between the hot junction fanning strip of diaphragm seal 1 and top is constant, therefore play the sealing function of hot operational excellence; Because temperature descends, the rotor of temperature distortion, expansion assembly 2, diaphragm seal 1 all recover ortho states after air preheater is shut down; That this structure has is simple in structure, cost is low, the advantage of good sealing effect, good reliability, but shortcoming is a black box to be exposed in the flue gas, be subjected to washing away of dust, and dust easily was deposited in wherein when folded section 1a launched, meeting wearing and tearing and diaphragm seal 1 are difficult to recover ortho states after long-time the use, can only be applicable to the operating mode that the flue gas cleaning degree is higher.
Embodiment two
By Fig. 3 and shown in Figure 4, the radial seal assembly for hot end of rotor of this rotary regenerative air preheater comprises diaphragm seal 1, expansion assembly 2 and mounting structure; The middle part of described diaphragm seal 1 is folded section 1a (as shown in Figure 5 and Figure 6), expansion assembly 2 comprises, following expansion element 2a and 2b, one end of two expansion elements connects firmly by bolt (not shown) and welding, be provided with spacing block 2c between the other end of the two, two expansion element 2a and 2b all connect firmly with spacing block 2c welding, last, also be provided with several piece intermediate isolating plate 3 between following expansion element 2a and the 2b, intermediate isolating plate 3 connects firmly (as shown in Figure 7 and Figure 8) with last expansion element 2a welding, wherein go up on the diaphragm seal 1 that expansion element 2a is welded in folded section 1a top, the coefficient of expansion of following expansion element 2b is greater than last expansion element 2a; Mounting structure comprises sealing backup plate 8, the sealing gripper shoe 9 of bending, protect a flap 10 and a left side outward, right cover plate 11 and 12, wherein seal the left side that backup plate 8 is positioned at diaphragm seal 1, seal gripper shoe 9 and protect flap 10 connects and be positioned at diaphragm seal 1 by five bolts 13 right side outward, and protect installing hole 10a corresponding on the flap 10 outward and be elongated hole (as Figure 12 and shown in Figure 13) longitudinally with bolt, the outer flap 10 that protects of top connects firmly with diaphragm seal 1 welding, the sealing gripper shoe 9 of below and sealing backup plate 8, and diaphragm seal 1 is equipped with chute 14 several correspondence and that be positioned at diaphragm seal folded section 1a below (as Fig. 9, Figure 10 and shown in Figure 5), sealing gripper shoe 9, sealing backup plate 8 and diaphragm seal 1 pass the bolt 15 of corresponding separately chute 14 by several, and the hot end of rotor that clamp nut 16 is loaded on air preheater is radially on the dividing plate 17, a left side, right cover plate 11 and 12 will be by sealing backup plate 8, seal gripper shoe 9 and protect the port closed that flap 10 is formed outward, expansion assembly 2 and diaphragm seal folded section 1a are positioned at by sealing backup plate 8, sealing gripper shoe 9, protect a flap 10 and a left side outward, in right cover plate 11 and 12 cavitys of forming;
During use: black box is contained in hot end of rotor radially on the dividing plate 17, make and keep 1 mm clearance (as shown in figure 14) between the hot junction fanning strip 18 of diaphragm seal 1 and top, and the end that upper and lower expansion element 2a and 2b are provided with spacing block 2c is near the hot end of rotor center-side of dividing plate 17 radially, and an end that connects firmly is near the hot end of rotor outer edge of dividing plate 17 radially; Run duration is with the rising of flue-gas temperature, " mushroom " thermal deformation takes place in rotor, because folded section 1a is deployable, the rotor of thermal deformation draws back folded section 1a, the lower semisection that makes diaphragm seal 1 is to bottom offset, expand after expansion assembly 2 is heated simultaneously, because the length of the last expansion element 2a expansion of expansion element 2b is bigger down, thereby last expansion element 2a tension, following expansion element 2b is to arch, upwards distortion of expansion assembly 2, similar " arch of bow and arrow ", offset diaphragm seal 1 under the deadweight effect flexural deformation and the first half to bottom offset, make the above the first half diaphragm seal of folded section 1a keep level, make that the gap between the hot junction fanning strip 18 of diaphragm seal 1 and top is constant, this moment diaphragm seal 1 the first half and protect flap 10 maintenance levels outward, the lower semisection of diaphragm seal 1 and sealing backup plate 8, sealing gripper shoe 9 is to bottom offset, bolt 13 slides in elongated hole, sealing gripper shoe 9 with protect flap 10 outward and can slide relatively, guarantee carrying out smoothly of dilatancy, therefore not only play the sealing function of hot operational excellence, and can avoid dust in the boiler flue to enter cavity contacting with diaphragm seal folded section 1a with expansion assembly 2, can not wear and tear after long-time the use and the diaphragm seal 1 easy ortho states that recovers, in the operating mode of high dust, also can guarantee the long-term operate as normal of black box.
Claims (4)
1. the radial seal assembly for hot end of rotor of a rotary regenerative air preheater comprises diaphragm seal, it is characterized in that also comprising expansion assembly and mounting structure; The middle part of described diaphragm seal is provided with folded section, expansion assembly comprises upper and lower expansion element, one end of two expansion elements connects firmly, be provided with spacing block between the other end of the two, two expansion elements all connect firmly with spacing block, wherein go up on the diaphragm seal that expansion element is welded in folded section top, the coefficient of expansion of following expansion element is greater than last expansion element; The hot end of rotor that diaphragm seal is loaded on air preheater by mounting structure is radially on the dividing plate.
2. the radial seal assembly for hot end of rotor of rotary regenerative air preheater as claimed in claim 1 is characterized in that described mounting structure comprises several chute of being located on the diaphragm seal of folded section below, is loaded on bolt and clamp nut in the corresponding chute.
3. the radial seal assembly for hot end of rotor of rotary regenerative air preheater as claimed in claim 1, it is characterized in that described mounting structure comprises the sealing backup plate, the sealing gripper shoe of bending, protect the cover plate at flap and two ends outward, wherein seal the side that backup plate is positioned at diaphragm seal, sealing gripper shoe and protect flap outward by two or more Bolt Connection and be positioned at the opposite side of diaphragm seal, and the two one of them installing hole corresponding with bolt is elongated hole longitudinally, top outer protects flap and diaphragm seal and welds and connect firmly, the sealing gripper shoe of below and sealing backup plate, and diaphragm seal is equipped with chute several correspondence and that be positioned at diaphragm seal folded section below, the sealing gripper shoe, sealing backup plate and diaphragm seal pass the bolt of corresponding chute separately by several, and the hot end of rotor that clamp nut is loaded on air preheater is radially on the dividing plate, the cover plate at two ends will be by the sealing backup plate, seal gripper shoe and protect the port closed that flap is formed outward, expansion assembly and diaphragm seal folded section are positioned at by the sealing backup plate, the sealing gripper shoe, protect outward in the cavity that the cover plate at flap and two ends forms.
4. as the radial seal assembly for hot end of rotor of the arbitrary described rotary regenerative air preheater of claim 1 to 3, it is characterized in that also being provided with between the upper and lower expansion element of described expansion assembly several piece intermediate isolating plate, intermediate isolating plate and the welding of last expansion element connect firmly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103060910A CN101629726B (en) | 2009-08-26 | 2009-08-26 | Radial seal assembly for hot end of rotor of rotary air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103060910A CN101629726B (en) | 2009-08-26 | 2009-08-26 | Radial seal assembly for hot end of rotor of rotary air preheater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101629726A true CN101629726A (en) | 2010-01-20 |
| CN101629726B CN101629726B (en) | 2011-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009103060910A Expired - Fee Related CN101629726B (en) | 2009-08-26 | 2009-08-26 | Radial seal assembly for hot end of rotor of rotary air preheater |
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| CN (1) | CN101629726B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102022543A (en) * | 2010-11-26 | 2011-04-20 | 北京化工大学 | Corrugated elastic seal and rotary air pre-heater sealing device |
| CN104913330A (en) * | 2015-05-07 | 2015-09-16 | 四川东能节能技术有限公司 | Air preheater and hot-end radial sealing device thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2789609Y (en) * | 2005-05-16 | 2006-06-21 | 中橡集团炭黑工业研究设计院 | Air preheater |
| CN201129739Y (en) * | 2007-09-30 | 2008-10-08 | 周一方 | Air pre-heating device sealing device |
| CN201137957Y (en) * | 2007-10-19 | 2008-10-22 | 哈尔滨润河科技有限公司 | Follow-up type flexible sealing device of rotary regenerative air pre-heater |
-
2009
- 2009-08-26 CN CN2009103060910A patent/CN101629726B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102022543A (en) * | 2010-11-26 | 2011-04-20 | 北京化工大学 | Corrugated elastic seal and rotary air pre-heater sealing device |
| CN104913330A (en) * | 2015-05-07 | 2015-09-16 | 四川东能节能技术有限公司 | Air preheater and hot-end radial sealing device thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101629726B (en) | 2011-01-12 |
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Owner name: SICHUAN DONGNENG ENERGY SAVING TECHNOLOGY CO., LTD Free format text: FORMER OWNER: YAN SHOUZHI Effective date: 20120116 |
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Free format text: CORRECT: ADDRESS; FROM: 643001 ZIGONG, SICHUAN PROVINCE TO: 610041 CHENGDU, SICHUAN PROVINCE |
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Effective date of registration: 20120116 Address after: 610041 nine Xing Xing Road 10, hi tech Zone, Sichuan, Chengdu Patentee after: SICHUAN DONGNENG ENERGY TECHNOLOGY Co.,Ltd. Address before: 643001, high tech incubator building 307, Huidong Industrial Park, Huidong new area, Sichuan, Zigong Patentee before: Yan Shouzhi |
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Granted publication date: 20110112 Termination date: 20210826 |