CN104153825A - Sealing method for preventing local steam leakage of split of steam turbine cylinder - Google Patents
Sealing method for preventing local steam leakage of split of steam turbine cylinder Download PDFInfo
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- CN104153825A CN104153825A CN201410362046.8A CN201410362046A CN104153825A CN 104153825 A CN104153825 A CN 104153825A CN 201410362046 A CN201410362046 A CN 201410362046A CN 104153825 A CN104153825 A CN 104153825A
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- split
- axially open
- heat
- stainless steel
- stamping steel
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Abstract
A sealing method for preventing local steam leakage of a split of a steam turbine cylinder includes the steps of marking a split of a lower cylinder of the steam turbine separated, with a leakage position; making a seal groove at the leakage position of the split of the lower cylinder; placing a heat-resistant stainless steel thin-walled tube having an axial opening into the seal groove, and making sure that the axial opening faces one high pressure side; combining an upper cylinder and the lower cylinder. When local steam leakage occurs to the split of the cylinder, leaking steam enters the heat-resistant stainless steel thin-walled tube having the axial opening and is trapped in the tube, and the heat-resistant stainless steel thin-walled tube expands under the action of high pressure of the leaking steam; sealing specific pressure of an opening edge in tight butt against the split and the side of the seal groove results in self-sealing, and groove sealing performance of a seal strip is more reliable. The sealing method has the advantages that only the split of the lower cylinder is provided with the seal groove, the requirement on fitting precision is none, and machining is facilitated; the sealing strip is made of the heat-resistant stainless steel thin-walled tube having the axial opening, and the manufacture cost is low.
Description
Technical field
The present invention relates to the local encapsulating method that leaks vapour of a kind of steam turbine cylinder split, particularly step and the Stamping Steel Ribbon of the local encapsulating method that leaks vapour of a kind of steam turbine cylinder split.
Background technique
Steam Turbine in Fire Power Plant has cylinder body, and the cylinder body of steam turbine has the upper cylinder body and the lower cylinder body that combine, and the junction surface of upper cylinder body and lower cylinder body is by the horizontal plane of axis, and the junction surface of upper cylinder body and lower cylinder body is also referred to as split.Upper cylinder body and lower cylinder body have respectively the flange along split.Assembling is when steam turbine, the flange of upper and lower cylinder body connected together with bolt.The operating temperature of Steam Turbine in Fire Power Plant and working pressure are very high, split between the upper and lower cylinder body flange of steam turbine does not have proprietary Stamping Steel Ribbon, the sealing of upper and lower cylinder body flange is that the plane precision processing by split ensures, when assembling, can scribble sealer at split.
The volume of Steam Turbine in Fire Power Plant is larger, and operating temperature and working pressure are very high.In the time of steam turbine operation, split need to ensure strictly to seal.
If the flange bolt fastening of split is improper when steam turbine cylinder assembling, or bolt generation stress relaxation in the time of steam turbine operation, particularly the even each several part that makes split of cylinder body internal cause temperature distributing disproportionation has the reasons such as larger temperature difference, all may cause split to have local deformation, make split in this generation gap, part and then be created in this part to leak vapour.Steam turbine cylinder split has local leakage after vapour, can find significantly leak vapour position at the split of the steam turbine cylinder spliting.Steam turbine cylinder split leaks vapour can affect the working efficiency of steam turbine significantly, even endangers the safe and stable operation of steam turbine when serious.
In the time that steam turbine cylinder split leaks vapour because of partially sealed facial disfigurement, be mostly in maintenance process, after steam turbine cylinder is split, adopt the processing method of field repair to solve.
For the leakage vapour to steam turbine cylinder split is at the scene repaired and is processed, in prior art, the local encapsulating method that leaks vapour of a kind of steam turbine cylinder split is disclosed in Chinese patent ZL 2,011 1 0245419.X, in sealing method, proposed definite steam turbine cylinder split and leaked the method in vapour region and deal with steam turbine cylinder split the method for leaking vapour, key step is:
1. determine the leakage vapour region of cylinder body split;
2. choose Stamping Steel Ribbon, choose the Stamping Steel Ribbon of suitable cross-section and material according to definite leakage vapour region ambient temperature, working fluids characteristic and pressure reduction around, and according to pressure reduction, startup and shutdown of units number of times before and after bad working environments, Stamping Steel Ribbon, the Stamping Steel Ribbon of choosing is carried out to Checking Fatigue calculating, to determine that sealing bar meets the tired requirement of unit starting within the normal military service phase, can not be damaged, as being damaged, meeting again chooses Stamping Steel Ribbon
3. go out seal groove at the leakage vapour region processing of upper cylinder body split or lower cylinder body split;
4. on the split of cylinder, slot, Stamping Steel Ribbon is installed.
When use, the path that Stamping Steel Ribbon can be blocked the leakage vapour of split reaches sealing effect.
The local encapsulating method that leaks vapour of this steam turbine cylinder split is being determined behind the leakage vapour region of cylinder body split, first choose the Stamping Steel Ribbon of suitable cross-section and material, then the Stamping Steel Ribbon of choosing is carried out to Checking Fatigue calculating, if Stamping Steel Ribbon does not meet the demands, again choose Stamping Steel Ribbon, if Stamping Steel Ribbon meets the demands, on the split of cylinder, slot, Stamping Steel Ribbon is installed.Only choosing Stamping Steel Ribbon taking cross section and material as condition, then the Stamping Steel Ribbon of choosing is carried out to Checking Fatigue calculating, is that a kind of method with cycle operation is chosen Stamping Steel Ribbon, and the work that makes to choose Stamping Steel Ribbon is very numerous and diverse.
In mechanical seal, except material, be exactly the structure of Stamping Steel Ribbon on the larger factor of sealability impact, do not consider suitable gasket structure, only choose Stamping Steel Ribbon from cross section and two aspects of material, how the very difficult imagination chooses suitable Stamping Steel Ribbon.In the time that said method is chosen suitable Stamping Steel Ribbon, will be through first choosing Stamping Steel Ribbon, then the Stamping Steel Ribbon of choosing is carried out to Checking Fatigue calculating, judge whether again the repeatedly circulation meeting the demands, numerous and diverse Stamping Steel Ribbon rational in infrastructure that is also difficult to optimize of not only working, the Stamping Steel Ribbon of choosing differs and ensures well surely the disconnected path that leaks vapour of effective ground resistance, is selecting after Stamping Steel Ribbon, could on split, open according to Stamping Steel Ribbon seal groove.
In the method for above-mentioned prior art, optimize in high-pressure cylinder, adopt the O type Stamping Steel Ribbon of high temperature resistant nickel-base alloy material, at low pressure (LP) cylinder, select the E type Stamping Steel Ribbon of corrosion resistant stainless steel, but how the O type Stamping Steel Ribbon and the E type Stamping Steel Ribbon that do not propose to optimize by above-mentioned circulation method produce beneficial effect, also do not point out the impact of these gasket structures on sealability.
In prior art, in said method, there is no Stamping Steel Ribbon rational in infrastructure.
Summary of the invention
The object of the invention is in order to overcome above-mentioned deficiency, propose to have the local encapsulating method that leaks vapour of a kind of steam turbine cylinder split of Stamping Steel Ribbon rational in infrastructure.
The present invention is achieved using the following method.
The local encapsulating method that leaks vapour of steam turbine cylinder split has the following steps:
1. determine the leakage vapour region of cylinder body split;
2. go out seal groove at the leakage vapour region processing of upper cylinder body split or lower cylinder body split;
3. get Stamping Steel Ribbon, described Stamping Steel Ribbon is the heat-resistance stainless steel thin walled tube with axially open, the length of heat-resistance stainless steel thin walled tube and the length of seal groove with axially open are Spielpassung, have the corresponding radial dimension of heat-resistance stainless steel thin walled tube of axially open and the width of groove or/and the degree of depth is interference fit;
4. Stamping Steel Ribbon is placed in above-mentioned seal groove, after Stamping Steel Ribbon is placed in seal groove, axially open is towards the seal groove notch limit of the higher side of cylinder pressure;
5. upper and lower cylinder body is merged, Stamping Steel Ribbon is embedded in the seal groove of upper cylinder body or lower cylinder body split, allow on the side of the higher side of cylinder pressure that an opening edge of Stamping Steel Ribbon is against seal groove, another opening edge is against on cylinder body split, and the axially open of Stamping Steel Ribbon leaks vapour gap towards the split of the higher side of cylinder pressure.
The gap of the Spielpassung between the above-mentioned length of heat-resistance stainless steel thin walled tube and the length of seal groove with axially open is 0 ~ 0.2 millimeter, has the corresponding radial dimension of heat-resistance stainless steel thin walled tube of axially open and the width of groove or/and the interference of the interference fit of the degree of depth is to have width that the corresponding radial dimension of the heat-resistance stainless steel thin walled tube of axially open is greater than groove or/and 3 ~ 5 millimeters of the degree of depth.
Because Stamping Steel Ribbon is the heat-resistance stainless steel thin walled tube with axially open, determine, in step, can first on split, make the seal groove matching by definite Stamping Steel Ribbon, not to make again the seal groove matching after optimizing Stamping Steel Ribbon by circulation method.
Because the length of heat-resistance stainless steel thin walled tube and the length of seal groove with axially open are Spielpassung, the corresponding width of radial dimension and seal groove is or/and the degree of depth is interference fit.Heat-resistance stainless steel thin walled tube has certain elasticity, in the seal groove that Stamping Steel Ribbon is placed on to upper cylinder body or lower cylinder body split leakage vapour position and on handle, after lower cylinder body merges, there is the heat-resistance stainless steel thin walled tube of axially open because being subject to the power of radial compression, allow an one opening edge be tight against on the side of upper cylinder body or lower cylinder body mid-separate surface seal groove, allow another opening edge be tight against on lower cylinder body or upper cylinder body split, axially open is the gap towards the higher side of cylinder pressure of split, the two ends with the heat-resistance stainless steel thin walled tube of axially open are to be against on the end face at upper cylinder body or lower cylinder body mid-separate surface seal groove two ends, in in the pipe of heat-resistance stainless steel thin walled tube with axially open, form enclosed cavity.
While Stamping Steel Ribbon being installed in seal groove, need to there is the proprietary step that the Stamping Steel Ribbon in the present invention is installed.
When use, in the time that this local gap of steam turbine cylinder split is leaked vapour, can be from above-mentioned gap in the axially open of Stamping Steel Ribbon enters into the heat-resistance stainless steel thin walled tube with axially open from the leakage vapour of this local gap of split, leaking vapour can be closed in the heat-resistance stainless steel thin walled tube with axially open, the heat-resistance stainless steel thin walled tube under the elevated pressures of leaking vapour with axially open can be by distending, enlarged opening limit is tight against the power in split and seal groove side, improve the seal pressure of Stamping Steel Ribbon and produce selfsealings, make the close more reliable performance of Stamping Steel Ribbon.This heat-resistance stainless steel thin walled tube with axially open is the Stamping Steel Ribbon rational in infrastructure using in the encapsulating method of the local leakage of steam turbine cylinder split vapour, install after Stamping Steel Ribbon by step of the present invention, can effectively prevent the local vapour that leaks of steam turbine cylinder split.
Below in conjunction with accompanying drawing, the present invention is further described.
Brief description of the drawings
Fig. 1 determines at the split of the steam turbine cylinder spliting the schematic diagram that leaks vapour region;
Fig. 2 is the schematic diagram of making seal groove in the leakage vapour region of lower cylinder body split;
Fig. 3 is placed on the schematic diagram in the seal groove of lower cylinder body split Stamping Steel Ribbon;
Fig. 4 merges upper and lower cylinder body, Stamping Steel Ribbon is pressed in to the schematic cross-section in the seal groove of lower cylinder body split;
Fig. 5 is the schematic perspective view of Stamping Steel Ribbon;
Fig. 6 has the schematic perspective view of the Stamping Steel Ribbon of the positioning plate matching with groove bottom;
Fig. 7 is the schematic cross-section after the Stamping Steel Ribbon of Fig. 6 is installed;
Fig. 8 be have side mounting plate Stamping Steel Ribbon install after schematic cross-section;
Fig. 9 is the schematic perspective view after the Stamping Steel Ribbon of Fig. 8 is installed.
Figure 10 is that cross section is the schematic perspective view of the oval-shaped heat-resistance stainless steel thin walled tube with axially open of opening;
Figure 11 is that cross section is the schematic perspective view of the heat-resistance stainless steel thin walled tube with axially open of the rectangular circle of opening;
Figure 12 is that cross section is the schematic perspective view of the heat-resistance stainless steel thin walled tube with axially open of opening round rectangle;
Figure 13 is that cross section is the schematic perspective view of the pentagonal heat-resistance stainless steel thin walled tube with axially open of opening fillet;
Figure 14 is that cross section is the schematic perspective view of the hexagonal heat-resistance stainless steel thin walled tube with axially open of opening fillet.
Embodiment
In Fig. 1 ~ Fig. 5, the local encapsulating method that leaks vapour of steam turbine cylinder split has the following steps:
on the lower cylinder body split 3 of the steam turbine upper cylinder body 1 spliting and lower cylinder body 2, find out Lou vapour position 4, generally spliting after the upper cylinder body and lower cylinder body of steam turbine, can observe significantly the leakage vapour position on split;
leakage vapour region processing at lower cylinder body split goes out seal groove 5;
get Stamping Steel Ribbon 6, described Stamping Steel Ribbon is the heat-resistance stainless steel thin-wall circular tube 8 with axially open 7, the number of degrees of the circumference dihedral angle a of axially open are 70 ~ 90 degree, the length of heat-resistance stainless steel thin-wall circular tube and the length of seal groove with axially open are Spielpassung, have the radial dimension of heat-resistance stainless steel thin-wall circular tube of axially open and the width of seal groove or/and the degree of depth is interference fit;
stamping Steel Ribbon is placed in above-mentioned seal groove, and after Stamping Steel Ribbon is placed in seal groove, axially open is towards the seal groove notch limit 9 of the higher side of cylinder pressure;
upper and lower cylinder body is merged, Stamping Steel Ribbon is embedded in the seal groove of upper cylinder body or lower cylinder body split, allow the groove side 11 of the higher side of cylinder pressure that an opening edge 10 of Stamping Steel Ribbon is against seal groove, another opening edge 12 is against on cylinder body split, and the axially open of Stamping Steel Ribbon leaks vapour gap 13 towards the split of the higher side of cylinder pressure.
The heat-resistance stainless steel thin-wall circular tube with axially open can roll and form with heat-resistance stainless steel thin plate.
If seal groove is longer, Stamping Steel Ribbon needs also longer, because Stamping Steel Ribbon is thin-wall circular tube, when Stamping Steel Ribbon is arranged in seal groove, along the circumferential direction angle is not easy to control and location, for longer Stamping Steel Ribbon can be arranged on easily in seal groove, can be connected with positioning plate at the tube wall of Stamping Steel Ribbon.
Positioning plate can be the positioning plate matching with the groove bottom of seal groove, can be also the positioning plate matching with the groove side of seal groove.
In Fig. 6, Fig. 7, the tube wall of Stamping Steel Ribbon is connected with the positioning plate 14 matching with the groove bottom of seal groove.
In Fig. 8, Fig. 9, the tube wall of Stamping Steel Ribbon is connected with the positioning plate 15 matching with the groove side of seal groove.
The above-mentioned heat-resistance stainless steel thin walled tube with axially open is thin-wall circular tube, and the cross section of described thin-wall circular tube is the annulus of opening.
The heat-resistance stainless steel thin walled tube with axially open can be also that cross section is the trip ring of other shape.Cross section is that the trip ring of other shape can be opening elliptical ring, the rectangular annulus of opening, opening round rectangle ring or opening fillet polygonal ring, and opening fillet polygonal ring can be opening fillet five ~ octacyclic rings.Cross section is that the heat-resistance stainless steel thin walled tube with axially open of above-mentioned other configured openings ring is respectively the heat-resistance stainless steel thin-walled elliptical tube with axially open, there is the rectangular pipe of heat-resistance stainless steel thin-walled of axially open, there is the heat-resistance stainless steel thin-walled round rectangle pipe and the heat-resistance stainless steel thin-walled fillet five ~ octagonal tube with axially open of axially open, the heat-resistance stainless steel thin-walled fillet five ~ octagonal tube with axially open has the heat-resistance stainless steel thin-walled fillet pentagon pipe with axially open and the heat-resistance stainless steel thin-walled fillet hexagonal tube with axially open.
The knuckle of the opening edge of opening round rectangle ring outside can oriented pipe.
In Figure 10, the cross section with the heat-resistance stainless steel thin walled tube of axially open is opening elliptical ring 16, an opening edge 17 of axially open is in the larger segmental arc of curvature, and another opening edge 18 of axially open is in the less segmental arc of curvature, and the number of degrees of the circumference dihedral angle b of opening are 70 ~ 90 degree.
In Figure 11, the cross section with the heat-resistance stainless steel thin walled tube of axially open is the rectangular annulus 19 of opening, and an opening edge 20 of the rectangular annulus of opening is on circular arc, and another opening edge 21 is on straightway, knuckle c outside the oriented pipe in straightway upper shed limit, the angle of knuckle c is 5 ~ 20 degree.
In Figure 12, the cross section with the heat-resistance stainless steel thin walled tube of axially open is opening round rectangle 22, and opening is at a fillet place of round rectangle, the knuckle d outside opening edge 23, the 24 oriented pipes of opening round rectangle ring, and the angle of knuckle d is 5 ~ 20 degree.
In Figure 13, the cross section with the heat-resistance stainless steel thin walled tube of axially open is opening fillet pentagon 25, and opening, on a pentagonal limit 26, has a side of the heat-resistance stainless steel thin-walled pentagon pipe of axially open.
In Figure 14, the cross section with the heat-resistance stainless steel thin walled tube of axially open is opening fillet Hexagon 27, and opening, on a hexagonal limit 28, has a side of the heat-resistance stainless steel thin-walled hexagonal tube of axially open.
Claims (7)
1. the local encapsulating method that leaks vapour of steam turbine cylinder split, comprises the leakage vapour region of first determining cylinder body split, it is characterized in that: also have the following steps:
(1) go out seal groove at the leakage vapour region processing of upper cylinder body split or lower cylinder body split;
(2) get Stamping Steel Ribbon, described Stamping Steel Ribbon is the heat-resistance stainless steel thin walled tube with axially open, the length of heat-resistance stainless steel thin walled tube and the length of seal groove with axially open are Spielpassung, have the corresponding radial dimension of heat-resistance stainless steel thin walled tube of axially open and the width of groove or/and the degree of depth is interference fit;
(3) Stamping Steel Ribbon is placed in above-mentioned seal groove, after Stamping Steel Ribbon is placed in seal groove, axially open is towards the seal groove notch limit of the higher side of cylinder pressure;
(4) upper and lower cylinder body is merged, Stamping Steel Ribbon is embedded in the seal groove of upper cylinder body or lower cylinder body split, allow on the side of the higher side of cylinder pressure that an opening edge of Stamping Steel Ribbon is against seal groove, another opening edge is against on cylinder body split, and the axially open of Stamping Steel Ribbon leaks vapour gap towards the split of the higher side of cylinder pressure.
2. by the local encapsulating method that leaks vapour of steam turbine cylinder split claimed in claim 1, it is characterized in that: described Stamping Steel Ribbon is the heat-resistance stainless steel thin-wall circular tube with axially open, the number of degrees of the circumference dihedral angle of opening are 70 ~ 90 degree.
3. by the local encapsulating method that leaks vapour of steam turbine cylinder split claimed in claim 1, it is characterized in that: described Stamping Steel Ribbon is the heat-resistance stainless steel thin-walled elliptical tube with axially open, an opening edge of axially open is in the larger segmental arc of curvature, another opening edge of axially open is in the less segmental arc of curvature, and the number of degrees of the circumference dihedral angle of opening are 70 ~ 90 degree.
4. by the local encapsulating method that leaks vapour of steam turbine cylinder split claimed in claim 1, it is characterized in that: described Stamping Steel Ribbon is the rectangular pipe of heat-resistance stainless steel thin-walled with axially open, an opening edge of axially open is on circular arc, another opening edge of axially open is on straightway, knuckle outside the oriented pipe in straightway upper shed limit, the angle of knuckle is 5 ~ 20 degree.
5. by the local encapsulating method that leaks vapour of steam turbine cylinder split claimed in claim 1, it is characterized in that: described Stamping Steel Ribbon is the heat-resistance stainless steel thin-walled round rectangle pipe with axially open, axially open is at a fillet place, knuckle outside the oriented pipe of opening edge of opening round rectangle ring, the angle of knuckle is 5 ~ 20 degree.
6. by the local encapsulating method that leaks vapour of steam turbine cylinder split claimed in claim 1, it is characterized in that: described Stamping Steel Ribbon is the heat-resistance stainless steel thin-walled fillet five ~ octagonal tube with axially open, and axially open is a side.
7. by the local encapsulating method that leaks vapour of steam turbine cylinder split claimed in claim 6, it is characterized in that: described Stamping Steel Ribbon is the heat-resistance stainless steel thin-walled fillet hexagonal tube with axially open, and axially open is a side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410362046.8A CN104153825B (en) | 2014-07-28 | 2014-07-28 | The encapsulating method of vapour is leaked in a kind of steam turbine cylinder split local |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410362046.8A CN104153825B (en) | 2014-07-28 | 2014-07-28 | The encapsulating method of vapour is leaked in a kind of steam turbine cylinder split local |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104153825A true CN104153825A (en) | 2014-11-19 |
| CN104153825B CN104153825B (en) | 2015-08-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410362046.8A Expired - Fee Related CN104153825B (en) | 2014-07-28 | 2014-07-28 | The encapsulating method of vapour is leaked in a kind of steam turbine cylinder split local |
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| Country | Link |
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| CN (1) | CN104153825B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113482728A (en) * | 2021-06-30 | 2021-10-08 | 康东玉 | Self-compensating gas turbine cylinder sealing device |
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| JPH10159503A (en) * | 1996-12-03 | 1998-06-16 | Mitsubishi Heavy Ind Ltd | Car cabin sealing device |
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| CN102322299A (en) * | 2011-08-25 | 2012-01-18 | 上海电气电站设备有限公司 | Sealing structure and sealing method of casing split |
| CN203239400U (en) * | 2013-05-27 | 2013-10-16 | 大唐贵州野马寨发电有限公司 | Low pressure cylinder sealing structure of turbine |
| CN103362576A (en) * | 2013-07-30 | 2013-10-23 | 东方电气集团东方汽轮机有限公司 | Method for sealing air cylinder split |
| CN203717046U (en) * | 2013-11-15 | 2014-07-16 | 西安西热节能技术有限公司 | Sealing structure for flange joint face of low-pressure cylinder of electricity-generation steam turbine |
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2014
- 2014-07-28 CN CN201410362046.8A patent/CN104153825B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10159503A (en) * | 1996-12-03 | 1998-06-16 | Mitsubishi Heavy Ind Ltd | Car cabin sealing device |
| JPH11324614A (en) * | 1998-05-14 | 1999-11-26 | Mitsubishi Heavy Ind Ltd | Turbine casing sealing device |
| CN102322299A (en) * | 2011-08-25 | 2012-01-18 | 上海电气电站设备有限公司 | Sealing structure and sealing method of casing split |
| CN203239400U (en) * | 2013-05-27 | 2013-10-16 | 大唐贵州野马寨发电有限公司 | Low pressure cylinder sealing structure of turbine |
| CN103362576A (en) * | 2013-07-30 | 2013-10-23 | 东方电气集团东方汽轮机有限公司 | Method for sealing air cylinder split |
| CN203717046U (en) * | 2013-11-15 | 2014-07-16 | 西安西热节能技术有限公司 | Sealing structure for flange joint face of low-pressure cylinder of electricity-generation steam turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113482728A (en) * | 2021-06-30 | 2021-10-08 | 康东玉 | Self-compensating gas turbine cylinder sealing device |
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