CN106032905A - Mechanical follow-up air preheater sealing control system - Google Patents
Mechanical follow-up air preheater sealing control system Download PDFInfo
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- CN106032905A CN106032905A CN201510115148.4A CN201510115148A CN106032905A CN 106032905 A CN106032905 A CN 106032905A CN 201510115148 A CN201510115148 A CN 201510115148A CN 106032905 A CN106032905 A CN 106032905A
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- fanning strip
- rotor
- air preheater
- axial
- constant force
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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 belongs to the technical field of air preheaters, and relates to a mechanical follow-up air preheater sealing control system. The system comprises a constant force spring hanging brackets, a hot end fanning strip, an axial plate, a cold end fanning strip, an axial seal assembly, a guide rail installed on the lower outer end of a rotor, and rollers installed on two sides of the outer end of the cold end fanning strip. The axial seal assembly is formed by an elastic contact axial sealing piece sheet and an axial sealing plate. The technical scheme uses inherent characteristics of the constant force spring hanging bracket, that is, when a hung weight has displacement, acting force thereof does not change. Using the characteristic, the constant force spring hanging bracket is fixed on an upper beam of the air preheater, a hanging bar of the constant force spring hanging bracket is connected with the hot end fanning strip. Two constant force spring hanging brackets are on the outer ends of each fanning strip, controlling the fanning strip to follow up with an air preheater rotor sealing surface.
Description
Technical field
The invention belongs to Air Preheater Technology field, relate to mechanical servo regenerative air heater sealing control system.
Background technology
Air preheater is arranged on boiler tail volume size and the heat-exchange apparatus of the biggest rotation of weight.Owing to equipment rotates, so the most required gap should be left equipped with between rotor and upper and lower fanning strip, the fixing shell of heat accumulating element.Preheater is heat transmission equipment, and after putting into operation, by flue gas, rotor generation thermal deformation, preset clearance changes the most therewith, and during preheater operating, hot junction and cold end have the biggest temperature difference, and this temperature difference changes with boiler load change.Therefore, the deformation of rotor is also to change with temperature height, temperature difference size.In other words, gap is also changing.The size of gap change is relevant with the size of boiler controller system, and the scope 12 of gap change～60 millimeters, i.e. rotor outer end sinks downwards 12～60 millimeters, and in the middle part of rotor, trace is upwards.So, it is formed for the gap of leaking out of 12～60 millimeters between preheater rotor outer end and top fanning strip, is formed and leak out in a large number.Meanwhile, bottom, preheater rotor outer end must be reserved with the space of 12～60 millimeters, adapts to preheater rotor outer end.
At present, existing process preheater hot junction radial seal mode has multiple, but the most less desirable；
The mode of existing process preheater cold end radial seal only has one, is i.e. reserved with the space of 12～60 millimeters, and this is formed for leaking out in a large number, particularly when boiler controller system peak regulation, leaks out and becomes apparent from.
Air preheater is the visual plant that large-size thermal power plant is indispensable, and its size leaked out directly affects the efficiency of boiler, meanwhile, leaks out and make exhaust smoke level increase, and pollutes environment.
Summary of the invention
The problem to be solved in the present invention is to use the multi-sealed seal clearance that exists in existing air preheater, and producing pressure reduction has pressure reduction, causes air-heater leakage.
In order to solve above-mentioned technical problem, the present invention provides following scheme: mechanical servo regenerative air heater sealing control system, including constant force spring hanging frame, hot junction fanning strip, axial plate, cold end sector plate, axial seal assembly, is loaded on the guide rail of outer end under rotor and is loaded on the roller of both sides, cold end sector plate outer end；Axial seal assembly is made up of elastic contact type axial seal pieces and axial sealing plate.Utilizing technique scheme: utilize the inherent character of constant force spring hanging frame, when i.e. its lifted weight is subjected to displacement, its active force is constant.Utilizing this characteristic to be fixed on by constant force spring hanging frame on air preheater upper beam, its suspension rod is connected with hot junction fanning strip, every piece of two, fanning strip outer end constant force spring hanging frame, controls fanning strip servo-actuated with air preheater rotor sealing surface.Fanning strip outer end, hot junction and axial sealing plate upper end thereof, axial sealing plate lower end is hinged with cold end sector plate outer end, hot junction fanning strip, axial sealing plate and cold end sector plate are connected as a single entity, the major part of its weight is suspended in midair by constant force spring hanging frame, suspension force is more than by hanging piece weight, coordinate owing to air preheater rotor outer end end face is equiped with a circle guide rail, guide rail and the roller being loaded on cold end sector plate outer end, make whole system be in dynamic balancing.When air preheater rotor is heated generation mushroom deformation, hot junction fanning strip, axial sealing plate and cold end sector plate are Tong Bu with air preheater rotor deformation displacement and servo-actuated.Therefore, as long as rotor upper-lower seal face energy normal rotation, avoid the need for the biggest reserved gap, during boiler varying duty, also can guarantee that less seal clearance, in other words, also can guarantee that less air leak rate of air curtain.
Further, described constant force spring hanging frame is fixed on air preheater upper beam, and its suspension rod is connected with hot junction fanning strip, every piece of two, fanning strip outer end constant force spring hanging frame, controls fanning strip servo-actuated with air preheater rotor sealing surface, it is ensured that total motion stabilization.
Further, the conventional apex seal of described hot end of rotor installing is air preheater rotor sealing surface；The cold end of rotor installs cold end apex seal, is used for solving air preheater cool and heat ends radially Air Leakage.
Accompanying drawing explanation
The present invention is further detailed explanation with detailed description of the invention below in conjunction with the accompanying drawings:
The structural representation of Fig. 1 embodiment of the present invention；
The roller devices structural representation of Fig. 2 embodiment of the present invention.
Detailed description of the invention
As shown in Figure 1, 2: mechanical servo regenerative air heater sealing control system, including constant force spring hanging frame 1, hot junction fanning strip 2, axial plate 3, cold end sector plate 4, axial seal assembly, it is loaded on the guide rail 5 of outer end under rotor and is loaded on the roller 6 of both sides, cold end sector plate 4 outer end；Axial seal assembly is made up of elastic contact type axial seal pieces 7 and axial sealing plate 8.Constant force spring hanging frame 1 is fixed on air preheater upper beam, and its suspension rod is connected with hot junction fanning strip 2, every piece of two, fanning strip outer end constant force spring hanging frame 1, controls fanning strip servo-actuated with air preheater rotor sealing surface.The conventional apex seal 9 of hot end of rotor installing is air preheater rotor sealing surface；The cold end of rotor installs cold end apex seal 10.
Before improvement, owing to preheater is in operation, upper temp is close to 400 ° of C, about 80 ° of C of bottom mean temperature, there is huge temperature difference, top radially there is also temperature difference with bottom preheater from center to outer rim, thus produces the mushroom deformation of preheater, sinks before preheater external modifications outside cold end, so, difference according to boiler load, it is necessary to the expansion clearance of reserved 12～60, causes and leaks out in a large number.Equally, between preheater rotor outer end and top fanning strip, due to the sinking of preheater rotor outer end, also forming the gap of leaking out of 12～60 millimeters, cause and leak out in a large number, radially leaks out and the second largest cold end that leaks out radially leaks out in the referred to as first hot junction of leaking out greatly.In the axial of regenerative air heater rotor of bringing back to life, due to the expansion of rotor, it is also necessary to reserve certain expansion space in cold conditions to rotor, upper expansion clearance G=10～18 millimeters, lower expansion gap H=5～9 millimeters, the biggest gap, produce leaks out, and the most the third-largest leaking out axially is leaked out.
After improvement, utilizing the inherent character of constant force spring hanging frame 1, when i.e. its lifted weight is subjected to displacement, its active force is constant.Utilize this characteristic that constant force spring hanging frame 1 is fixed on (see figure 1) on air preheater upper beam, its suspension rod is connected with hot junction fanning strip 2, every piece of two, fanning strip outer end constant force spring hanging frame 1, control fanning strip servo-actuated with air preheater rotor sealing surface, air preheater rotor both ends of the surface, the conventional apex seal 7 of installing is air preheater rotor sealing surface, controls air preheater cool and heat ends radial seal, solves air preheater cool and heat ends radially Air Leakage.Hot junction fanning strip 2 outer end and axial sealing plate 8 upper end thereof, axial sealing plate 8 lower end is hinged with cold end sector plate 4 outer end, hot junction fanning strip 2, axial sealing plate 8 and cold end sector plate 4 are connected as a single entity, the major part of its weight is suspended in midair by constant force spring hanging frame 1, suspension force is more than by hanging piece weight, coordinate owing to air preheater rotor outer end end face is equiped with a circle guide rail 5, guide rail 5 and the roller 6 being loaded on cold end sector plate 4 outer end, make whole system be in dynamic balancing.When air preheater rotor is heated generation mushroom deformation, hot junction fanning strip 2, axial sealing plate 8 and cold end sector plate 4 are Tong Bu with air preheater rotor deformation displacement and servo-actuated.Therefore, as long as rotor upper-lower seal face energy normal rotation, avoid the need for the biggest reserved gap, during boiler varying duty, also can guarantee that less seal clearance, in other words, also can guarantee that less air leak rate of air curtain.
Elastic axially sealing system, in the axial of regenerative air heater rotor of bringing back to life, expansion due to rotor, also certain expansion space must be reserved in cold conditions to rotor, as it is shown in figure 1, upper expansion clearance G=10～18 millimeters, lower expansion gap H=5～9 millimeters, the biggest gap, leaking out of generation, the most the third-largest leaking out axially is leaked out.
The elastic axially sealing system of contact is made up of the axial diaphragm seal of elasticity 7, torsionspring, pressing plate and fixture, he is less than conventional with the assemblage gap of axial sealing plate, when air preheater rotor duty rotates, elastic axially diaphragm seal 7 and axial sealing plate 8 are zero clearance seal, therefore the axial Air Leakage of air preheater is addressed.At present, solving the precedent axially leaked out of air preheater the most very well, this is one to innovate greatly.
Described on end, this patent successfully controls the sealing problem of air preheater, solve the big main air leakage source of the radial seal of air preheater hot junction, cold end radial seal and axial seal three, greatly reduce and leak out, the air leak rate of air curtain of air preheater mechanically can be made to be reduced to the level that the front institute position of 4.5% has.
Above-described is only the preferred embodiment of the present invention; should be understood that; for a person skilled in the art; on the premise of without departing from present configuration; some deformation and improvement can also be made; also should be considered as protection scope of the present invention, these are all without affecting effect and the practical applicability that the present invention implements.
Claims (3)
1. mechanical servo regenerative air heater sealing control system, it is characterised in that: include constant force spring hanging frame, hot junction fanning strip, axial plate, cold end sector plate, axial seal assembly, be loaded on the guide rail of outer end under rotor and be loaded on the roller of both sides, cold end sector plate outer end；Axial seal assembly is made up of elastic contact type axial seal pieces and axial sealing plate.
Mechanical servo regenerative air heater sealing control system the most according to claim 1, it is characterized in that: described constant force spring hanging frame is fixed on air preheater upper beam, its suspension rod is connected with hot junction fanning strip, every piece of two, fanning strip outer end constant force spring hanging frame, controls fanning strip servo-actuated with air preheater rotor sealing surface.
Mechanical servo regenerative air heater sealing control system the most according to claim 1, it is characterised in that: the conventional apex seal of described hot end of rotor installing is air preheater rotor sealing surface；The cold end of rotor installs cold end apex seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510115148.4A CN106032905B (en) | 2015-03-16 | 2015-03-16 | Mechanical servo regenerative air heater sealing control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510115148.4A CN106032905B (en) | 2015-03-16 | 2015-03-16 | Mechanical servo regenerative air heater sealing control system |
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| Publication Number | Publication Date |
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| CN106032905A true CN106032905A (en) | 2016-10-19 |
| CN106032905B CN106032905B (en) | 2018-06-19 |
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| CN201510115148.4A Active CN106032905B (en) | 2015-03-16 | 2015-03-16 | Mechanical servo regenerative air heater sealing control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110792776A (en) * | 2019-12-03 | 2020-02-14 | 四川美加宜节能技术有限公司 | A non-contact flexible sealing structure for rotary air preheater |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2828580Y (en) * | 2005-04-20 | 2006-10-18 | 沈汉浩 | Labyrinth compensation radial sealing device |
| CN201137957Y (en) * | 2007-10-19 | 2008-10-22 | 哈尔滨润河科技有限公司 | Rotary air preheater follow-up flexible sealing device |
| US20090145574A1 (en) * | 2007-12-05 | 2009-06-11 | Frank Klisura | Self-adjusting seal for a heat exchanger |
| CN203836205U (en) * | 2014-05-09 | 2014-09-17 | 贾朝群 | Roller type contact sealing device for air preheater |
| CN204574094U (en) * | 2015-03-16 | 2015-08-19 | 四川东能节能技术有限公司 | Mechanical servo regenerative air heater sealing control system |
-
2015
- 2015-03-16 CN CN201510115148.4A patent/CN106032905B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2828580Y (en) * | 2005-04-20 | 2006-10-18 | 沈汉浩 | Labyrinth compensation radial sealing device |
| CN201137957Y (en) * | 2007-10-19 | 2008-10-22 | 哈尔滨润河科技有限公司 | Rotary air preheater follow-up flexible sealing device |
| US20090145574A1 (en) * | 2007-12-05 | 2009-06-11 | Frank Klisura | Self-adjusting seal for a heat exchanger |
| CN203836205U (en) * | 2014-05-09 | 2014-09-17 | 贾朝群 | Roller type contact sealing device for air preheater |
| CN204574094U (en) * | 2015-03-16 | 2015-08-19 | 四川东能节能技术有限公司 | Mechanical servo regenerative air heater sealing control system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110792776A (en) * | 2019-12-03 | 2020-02-14 | 四川美加宜节能技术有限公司 | A non-contact flexible sealing structure for rotary air preheater |
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| CN106032905B (en) | 2018-06-19 |
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