CN116571986A - Method and system for removing seals in steam turbines - Google Patents
Method and system for removing seals in steam turbines Download PDFInfo
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- CN116571986A CN116571986A CN202310403028.9A CN202310403028A CN116571986A CN 116571986 A CN116571986 A CN 116571986A CN 202310403028 A CN202310403028 A CN 202310403028A CN 116571986 A CN116571986 A CN 116571986A
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000007789 sealing Methods 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims description 47
- 230000001276 controlling effect Effects 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 2
- 125000004122 cyclic group Chemical group 0.000 claims 2
- 238000010276 construction Methods 0.000 abstract description 13
- 239000004035 construction material Substances 0.000 abstract description 4
- 238000003466 welding Methods 0.000 description 11
- 238000005520 cutting process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/02—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same
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Abstract
The present disclosure relates to a method and a system for dismantling a seal in a steam turbine, the seal (3) being arranged between a first flange (11) of a main valve (1) and a second flange (21) of a cylinder (2), the method comprising the steps of: A. stopping the turbine unit; B. the main valve front pipeline (4) and the main valve are respectively supported; C. a tensioning device is utilized to enable the first flange and the second flange to bear tensioning force; D. -moving a cap nut (5) in a first direction out of engagement with the first flange and the second flange; E. removing fasteners connecting the first flange and the second flange; F. separating the first flange and the second flange with the tensioning device; G. and (5) detaching the sealing element. Through the technical scheme, the method is high in reliability, and can simplify construction steps, reduce construction materials, reduce construction manpower and shorten construction time.
Description
Technical Field
The present disclosure relates to the field of steam turbine technology, and in particular, to a method and system for removing seals in a steam turbine.
Background
In a thermal power plant, a boiler heats water into superheated steam by burning coal, the superheated steam flows through a main valve and a valve to enter a cylinder of a steam turbine, and high-temperature and high-pressure superheated steam does work in the cylinder to convert steam heat energy into mechanical energy so as to drive a generator to rotate for power generation.
In the related art, the steam inlet flange of the main valve is connected with the steam inlet flange of the cylinder through bolts and is sealed through a sealing piece (for example, a metal U-shaped sealing ring), and in addition, a cover nut (which is in threaded connection with the two steam inlet flanges) is sleeved on the outer sides of the two steam inlet flanges so as to realize connection and fastening of the two steam inlet flanges. However, when the sealing element needs to be replaced, the common maintenance process often needs to cut the steam inlet pipeline (communicated with the front pipeline of the main valve), then loosen the cover nut and the steam inlet flange in sequence, check, measure and replace the sealing element, connect the steam inlet flange and the cover nut in sequence after the replacement is completed, and finally perform welding recovery work on the cut steam inlet pipeline. The overhaul mode needs to cut the steam inlet pipeline first and then weld and recover the steam inlet pipeline, wherein the steam inlet pipeline is complex in welding and post-welding heat treatment process, time-consuming and labor-consuming, more welding materials are needed for the cutting, welding and heat treatment process, the cost is high, and in addition, welding defects and hidden dangers are easy to occur after welding.
Disclosure of Invention
It is an object of the present disclosure to provide a method and a system for disassembling a seal in a steam turbine, which is highly reliable and can simplify construction steps, reduce construction materials, reduce construction labor, and shorten construction time.
In order to achieve the above object, the present disclosure provides a method for disassembling a seal in a steam turbine, the seal being disposed between a first flange of a main valve and a second flange of a cylinder, the method comprising the steps of: A. stopping the turbine unit; B. supporting the main valve front pipeline and the main valve respectively; C. a tensioning device is utilized to enable the first flange and the second flange to bear tensioning force; D. moving a bonnet nut in a first direction to disengage the first flange and the second flange; E. removing fasteners connecting the first flange and the second flange; F. separating the first flange and the second flange with the tensioning device; G. and (5) detaching the sealing element.
Optionally, in step B, the main port front duct and the main port each have at least one support point.
Optionally, the method further comprises: x1. controlling a heating device to heat the cap nut at a first preset temperature; x2. stopping heating when the heating time reaches a first preset time threshold, wherein steps X1-X2 are set after step C and before step D.
Optionally, the first preset temperature is 300 ℃ to 400 ℃; and/or the first preset time threshold is 35-40min.
Optionally, the method further comprises: H. measuring the size and compression of the detached sealing element, obtaining a measured value, and processing the standby sealing element according to the measured value; I. assembling a machined backup seal between the first flange and the second flange; J. the tensioning device is utilized to enable the main valve and the cylinder to bear tensioning force, and the first flange and the second flange are connected through a fastener; K. and (3) moving the cover nut along the first direction to be sleeved and locked on the outer peripheral surfaces of the first flange and the second flange, wherein the steps H-K are arranged after the step G.
Optionally, step K includes: K1. moving the cap nut along the first direction to be sleeved on the outer peripheral surfaces of the first flange and the second flange; K2. controlling a heating device to heat the cover nut at a second preset temperature; K3. stopping heating when the heating time reaches a second preset time threshold; K4. and controlling the cover nut to rotate by a preset angle.
Optionally, the second preset temperature is 300 ℃ to 400 ℃; and/or the second preset time threshold is 35-45min; and/or the preset angle is 8.1-8.5 degrees.
Optionally, the cap nut is moved 150-200mm in the first direction.
Optionally, in step a, the method further includes: and stopping the EH oil pump, removing an oil inlet and return pipe of the main valve and the valve regulating oil motor, and removing a valve rod leakage flange, wherein before removing the valve rod leakage flange, removing the heat insulation layer on the outer side of the cover nut.
In accordance with the foregoing aspects, the present disclosure also provides a system for removing a seal in a steam turbine, the system comprising: a tensioning device for applying a tensioning force between the first flange and the second flange or for separating the first flange and the second flange; the supporting device is used for supporting the main valve front pipeline and the main valve respectively; and a heating device for heating the cap nut.
Optionally, the tensioning device is capable of telescoping in a first direction and has one end connected to the main valve and the other end connected to a cylinder; wherein a tightening force is applied between the first flange and the second flange when the tightening device is extended in the first direction; the first flange and the second flange separate when the tensioning device is contracted in the first direction.
Optionally, the supporting device comprises a first supporting piece for supporting the main valve front pipeline and a second supporting piece for supporting the main valve, wherein the first supporting piece and the second supporting piece are fixedly arranged on a foundation surface and respectively provided with a supporting part for supporting the main valve or the main valve front pipeline.
Optionally, the heating device includes a plurality of ring heater, and a plurality of ring heater cover is established the periphery of cover nut just follows the axial direction interval setting of cover nut, wherein, every ring heater's inner wall all is provided with a plurality of heating mouths, and a plurality of the circumference interval even setting of this ring heater is followed to the heating mouth.
According to the technical scheme, in the method for disassembling the sealing element in the steam turbine, in the process of disassembling the sealing element, the main valve and the main valve front pipeline can be prevented from being damaged due to the weight of the main valve and other pipelines connected with the main valve or the main valve front pipeline after the first flange and the second flange are separated by supporting the main valve front pipeline. When the first flange and the second flange are separated, the tensioning device is utilized to firstly enable the first flange and the second flange to bear tensioning force, at this time, the first flange and the second flange can bear tensioning force, the cover nut can be conveniently detached, namely, the cover nut can be moved to be separated from the first flange and the second flange along a first direction, then, fasteners for connecting the first flange and the second flange are detached, the first flange and the second flange are separated by utilizing the tensioning device, and finally, the sealing element is detached. The sealing piece can be replaced without cutting the steam inlet pipeline by using the method, welding and post-welding heat treatment procedures of the steam inlet pipeline are not needed, the reliability is high, the construction steps can be simplified, the construction materials are reduced, the construction manpower is reduced, and the construction time is shortened.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a schematic view of a prior art steam turbine in which a cylinder and a main valve are connected;
FIG. 2 is a cross-sectional view of a cylinder and main ports in a coupled state in a conventional steam turbine, wherein a seal is shown;
FIG. 3 is a schematic view of a heating apparatus provided in accordance with an embodiment of the present disclosure;
fig. 4 is another structural schematic diagram of a heating device provided according to an embodiment of the present disclosure, in which a cap nut is shown.
Description of the reference numerals
1-a main valve; 11-a first flange; 2-cylinder; 21-a second flange; 3-seals; 4-a main valve front pipe; 5-cap nut; 6-a heating device; 61-an annular heater; 611-heating port.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
In the present disclosure, unless otherwise stated, terms such as "inner and outer" are used to refer to "inner and outer" with respect to the outline of the corresponding component itself. In addition, the use of the terms "first," "second," etc. are used to distinguish between different components and do not have order or importance. Furthermore, in the following description, when referring to the drawings, like numerals in different drawings denote like elements. It is to be understood by persons of ordinary skill in the art that the above definitions are provided solely for the purposes of explaining and illustrating the present disclosure and are not to be construed as limiting the present disclosure.
According to an embodiment of the present disclosure, there is provided a method for disassembling a seal in a steam turbine, the seal 3 being disposed between a first flange 11 of a main port 1 (i.e., an inlet flange of the main port 1) and a second flange 21 of a cylinder 2 (i.e., an inlet flange of the cylinder 2), as shown with reference to fig. 1 and 2, the method may include the steps of: A. stopping the turbine unit; B. the main valve front pipe 4 and the main valve 1 are respectively supported; C. the tensioning device is used for bearing tensioning force between the first flange 11 and the second flange 21; D. moving the cap nut 5 in a first direction (i.e. in the transverse direction in fig. 2) out of engagement with the first flange 11 and the second flange 21; E. removing fasteners connecting the first flange 11 and the second flange 21; F. the first flange 11 and the second flange 21 are separated by means of a tensioning device; G. the seal 3 is removed.
Through the above technical solution, in the method for disassembling a sealing member in a steam turbine provided by the present disclosure, in the process of disassembling the sealing member 3, by supporting the main valve front pipe 4 and the main valve 1, it is possible to avoid that the main valve 1 and the main valve front pipe 4 damage other pipes connected to the main valve 1 or the main valve front pipe 4 due to their own weights after the first flange 11 and the second flange 21 are separated. When the first flange 11 and the second flange 21 are separated, the first flange 11 and the second flange 21 are subjected to the tensioning force by the tensioning device, and at this time, the first flange 11 and the second flange 21 are subjected to the tensioning force, so that the cover nut 5 can be detached conveniently, that is, the cover nut 5 can be moved in the first direction to be separated from the first flange 11 and the second flange 21, then the fastening piece for connecting the first flange 11 and the second flange 21 is detached, the first flange 11 and the second flange 21 are separated by the tensioning device, and finally the sealing piece 3 is detached. The sealing piece 3 can be replaced without cutting the steam inlet pipeline by using the method, welding of the steam inlet pipeline and a post-welding heat treatment process are not needed, the reliability is high, the construction steps can be simplified, the construction materials can be reduced, the construction manpower can be reduced, and the construction time can be shortened.
In the specific embodiment provided in the present disclosure, in the above step B, the main port front pipe 4 and the main port 1 may have at least one supporting point, respectively. That is, the main port front pipe 4 may have at least one supporting point, and the main port 1 may have at least one supporting point, so that by supporting at least one supporting point of the main port front pipe 4 and at least one supporting point of the main port 1, it is possible to prevent the main port 1 and the main port front pipe 4 from damaging other pipes connected to the main port 1 or the main port front pipe 4 due to their own weights after the first flange 11 and the second flange 21 are separated. Wherein, referring to fig. 1, the main valve 1 has two support points, namely, the positions indicated by Y2 and Y3 in fig. 1, and the main valve front pipe 4 has one support point, namely, the position indicated by Y1 in fig. 1, when the main valve front pipe 4 and the main valve 1 are supported. By being supported at three positions Y1, Y2 and Y3. In other embodiments of the present disclosure, the support for the main valve 1 and the main valve front pipe 4 may be other configurations, for example, the main valve 1 and the main valve front pipe have two support points, respectively, which are not limited in any way, and may be adaptively selected according to actual needs by those skilled in the art.
In the specific embodiment provided in the present disclosure, to facilitate the disassembly of the cap nut 5, the method may further include: x1. controlling the heating means 6 to heat the cap nut 5 at a first preset temperature; x2. stopping heating when the heating time reaches a first preset time threshold, wherein steps X1-X2 are set after step C and before step D. Namely, the removal of the cap nut 5 from the first flange 11 and the second flange 21 is achieved by means of thermal loosening. Wherein the first preset temperature is 300-400 ℃; and/or the first preset time threshold is 35-40min. In the actual operation process, an operator can select a proper first preset temperature and a first preset time threshold within the range of the first preset temperature and the first preset time threshold according to actual needs and experience, so that the thermal loosening of the cover nut 5 can be quickly realized to facilitate the disassembly. Illustratively, the first preset temperature may be 300 ℃,320 ℃,330 ℃,350 ℃,370 ℃,400 ℃, etc., and the first preset time threshold may be 35min,36min,37min,38min,39min,40min, etc., without any limitation to the present disclosure.
In the specific embodiment provided in the present disclosure, in order to implement replacement of the sealing member 3, the method may further include: H. measuring the size (for example, the groove depth size of the U-shaped sealing ring when the sealing member is the U-shaped sealing ring) and the compression amount of the detached sealing member, obtaining a measured value, and processing the standby sealing member according to the measured value; I. assembling the machined backup seal between the first flange 11 and the second flange 21; J. the main valve 1 and the cylinder 2 are subjected to tension by a tension device, and the first flange 11 and the second flange 21 are connected by fasteners; K. the cap nut 5 is moved in the first direction to fit over and lock the outer circumferential surfaces of the first flange 11 and the second flange 21, wherein steps H-K are provided after step G. That is, the backup seal is processed based on the measured value of the detached seal, and after the processing is completed, the backup seal is fitted between the first flange 11 and the second flange 21 and connects the first flange 11 and the second flange 21, and finally the cap nut 5 is fitted over and locked to the outer peripheral surfaces of the first flange 11 and the second flange 21.
In a specific embodiment provided in the present disclosure, the step K includes: K1. the cover nut 5 is moved to be sleeved on the outer peripheral surfaces of the first flange 11 and the second flange 21 along the first direction, before the step K1 is carried out, the internal threads of the cover nut 5 and the external threads of the first flange 11 and the second flange 21 can be cleaned, burrs are removed, and high-temperature resistant varnish and a thread anti-biting agent are sprayed on the internal threads and the external threads respectively so as to ensure the connection reliability of the cover nut 5 and the first flange 11 and the second flange 21; K2. controlling the heating device 6 to heat the cover nut 5 at a second preset temperature; K3. stopping heating when the heating time reaches a second preset time threshold; K4. the cap nut 5 is controlled to rotate by a preset angle. That is, the cage nut 5 is locked to the outer peripheral surfaces of the first flange 11 and the second flange 21 by heat tightening. Wherein the second preset temperature is 300-400 ℃; and/or, the second preset time threshold is 35-45min; and/or the preset angle is 8.1-8.5 degrees. In the actual operation process, an operator can select a proper first preset temperature, first preset time threshold and preset angle within the range of the first preset temperature, first preset time threshold and preset angle according to actual needs and experience, so as to ensure that the cap nut 5 can be rapidly heated to be reliably locked on the outer peripheral surfaces of the first flange 11 and the second flange 21. Illustratively, the second preset temperature may be 300 ℃,320 ℃,330 ℃,350 ℃,370 ℃,400 ℃, etc., while the second preset time threshold may be 35min,38min,39min,40min,42min,45min, etc., the preset angle may be 8.1 °,8.2 °,8.4 °,8.5 °, etc., and the disclosure is not limited in any way.
In the specific embodiment provided by the present disclosure, the bonnet nut 5 may be moved 150-200mm in the first direction. That is, this method is advantageous in shortening the construction time because the amount of movement of the cap nut 5 is small when the seal 3 is detached. In the actual operation process, an operator can select an appropriate amount of movement of the cap nut 5 according to actual needs and experience, and the present disclosure is not limited in this regard. It should be noted here that the movement of the cap nut 5 in the first direction may be achieved in any suitable manner, and the disclosure is not limited in any way. Those skilled in the art can adapt the choice according to the actual needs.
In the specific embodiment provided in the present disclosure, in step a, the method may further include: the EH oil pump is stopped, the oil inlet and return pipe of the main valve 1 and the valve regulating oil engine is removed, and the valve rod leakage flange is removed, namely, the oil inlet and return pipe of the main valve 1 is removed, the corresponding pipeline is blocked, and the valve rod leakage flange is removed, and the corresponding pipeline is blocked. Wherein, before dismantling the door rod gas leakage flange, dismantle the heat preservation of the cover nut 5 outside. Namely, when the temperature of the ultrahigh-pressure rotor in the cylinder 2 is reduced to 180-200 ℃, removing the heat-insulating layer outside the cover nut 5, but keeping the last heat-insulating layer, then measuring the surface temperature of the cover nut 5, and when the surface temperature is reduced to 50-60 ℃, removing the last heat-insulating layer.
In accordance with the foregoing aspects, the present disclosure also provides a system for removing a seal in a steam turbine, the system comprising: tensioning means for causing tension to be applied between the first flange 11 and the second flange 21 or for causing the first flange 11 and the second flange 21 to separate; support means for supporting the main port front duct 4 and the main port 1, respectively; and a heating device 6 for heating the cap nut 5.
In the embodiments provided in the present disclosure, the tensioning device may be configured in any suitable manner, alternatively, the tensioning device may be capable of telescoping in a first direction and with one end detachably connected to the main valve 1 and the other end detachably connected to the cylinder 2; wherein, when the tensioning device is elongated in a first direction, a tensioning force is applied between the first flange 11 and the second flange 21 to facilitate removal of the cap nut 5 from the first flange 11 and the second flange 21; when the tensioning device is contracted in the first direction, the first flange 11 and the second flange 21 are separated to facilitate the disassembly of the seal 3. For example, the tensioning device may be configured as a hydraulic telescopic rod, one end of which in the axial direction is detachably connected to the main valve 1, and the other end is detachably connected to the cylinder 2. In other embodiments of the present disclosure, the tensioning device may be configured in other ways, and the present disclosure is not limited in any way.
In the specific embodiment provided in the present disclosure, the support device may include a first support member for supporting the main port front pipe 4 and a second support member for supporting the main port 1, each of the first support member and the second support member being fixedly disposed on the base surface and having a support portion for supporting the main port 1 or the main port front pipe 4, respectively. The first supporting member and the second supporting member may be configured in any suitable manner, alternatively, the first supporting member and the second supporting member may be configured as hydraulic telescopic frames, and the hydraulic telescopic frames are placed on a foundation surface and respectively have supporting portions for supporting the main valve 1 or the main valve front pipe 4, the foundation surface may be adaptively designed according to actual needs, and the foundation surface may be a cement installation surface or a ground surface, which is not limited in this disclosure. In other embodiments of the present disclosure, the first support and the second support may be configured in other ways, and the present disclosure is not limited in any way.
In the specific embodiment provided in the present disclosure, the heating device 6 may be configured in any suitable manner, and alternatively, as shown in fig. 3 and 4, the heating device 6 may include a plurality of ring-shaped heaters 61, and the plurality of ring-shaped heaters 61 are sleeved on the outer circumference of the cap nut 5 and are disposed at intervals along the axial direction of the cap nut 5, so as to ensure that the cap nut 5 can be heated uniformly. Wherein, the inner wall of each annular heater 61 is provided with a plurality of heating ports 611, the arrangement of the heating ports 611 can facilitate heating the cap nut 5, here, the heating ports 611 can heat the cap nut 5 by spraying hot steam, and can heat the cap nut 5 by spraying flame, and the disclosure is not limited in any way. And the plurality of heating ports 611 are uniformly arranged at intervals along the circumferential direction of the ring heater 61, uniform heating of the cap nut 5 can be ensured. In other embodiments of the present disclosure, the heating device 6 may be configured in other ways, and the present disclosure is not limited in any way.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (13)
1. A method for removing a seal in a steam turbine, the seal disposed between a first flange of a main valve and a second flange of a cylinder, the method comprising the steps of:
A. stopping the turbine unit;
B. supporting the main valve front pipeline and the main valve respectively;
C. a tensioning device is utilized to enable the first flange and the second flange to bear tensioning force;
D. moving a bonnet nut in a first direction to disengage the first flange and the second flange;
E. removing fasteners connecting the first flange and the second flange;
F. separating the first flange and the second flange with the tensioning device;
G. and (5) detaching the sealing element.
2. The method according to claim 1, wherein in step B, the main port front duct and the main port each have at least one support point.
3. The method according to claim 1, wherein the method further comprises:
x1. controlling a heating device to heat the cap nut at a first preset temperature;
x2. when the heating time reaches the first preset time threshold, stopping heating,
wherein steps X1-X2 are arranged after step C and before step D.
4. A method according to claim 3, wherein the first preset temperature is 300 ℃ to 400 ℃; and/or the first preset time threshold is 35-40min.
5. The method according to claim 1, wherein the method further comprises:
H. measuring the size and compression of the detached sealing element, obtaining a measured value, and processing the standby sealing element according to the measured value;
I. assembling a machined backup seal between the first flange and the second flange;
J. the tensioning device is utilized to enable the main valve and the cylinder to bear tensioning force, and the first flange and the second flange are connected through a fastener;
K. moving the cover nut along the first direction to be sleeved and locked on the outer peripheral surfaces of the first flange and the second flange,
wherein steps H-K are provided after step G.
6. The method of claim 5, wherein step K comprises:
K1. moving the cap nut along the first direction to be sleeved on the outer peripheral surfaces of the first flange and the second flange;
K2. controlling a heating device to heat the cover nut at a second preset temperature;
K3. stopping heating when the heating time reaches a second preset time threshold;
K4. and controlling the cover nut to rotate by a preset angle.
7. The method of claim 6, wherein the second preset temperature is 300 ℃ to 400 ℃; and/or the number of the groups of groups,
the second preset time threshold is 35-45min; and/or the number of the groups of groups,
the preset angle is 8.1-8.5 degrees.
8. The method of claim 1 or 5, wherein the bonnet nut is moved 150-200mm in the first direction.
9. The method according to claim 1, further comprising, in step a: stopping the EH oil pump, removing the oil inlet and return pipe of the main valve and the valve regulating oil motor, removing the valve rod air leakage flange,
before the door rod air leakage flange is removed, the heat insulation layer on the outer side of the cover nut is removed.
10. A system for removing seals in a steam turbine, the system comprising:
a tensioning device for applying a tensioning force between the first flange and the second flange or for separating the first flange and the second flange;
the supporting device is used for supporting the main valve front pipeline and the main valve respectively; and
and the heating device is used for heating the cover nut.
11. The system of claim 10, wherein the tensioning device is retractable in a first direction and has one end connected to the main valve and the other end connected to a cylinder;
wherein a tightening force is applied between the first flange and the second flange when the tightening device is extended in the first direction; the first flange and the second flange separate when the tensioning device is contracted in the first direction.
12. The system of claim 10, wherein the support means comprises a first support for supporting the main port front duct and a second support for supporting the main port, the first support and the second support each being fixedly disposed on a base surface and having a support for supporting the main port or the main port front duct, respectively.
13. The system of claim 10, wherein the heating means comprises a plurality of ring heaters sleeved on the outer circumference of the cap nut and spaced apart along the axial direction of the cap nut,
wherein, every the inner wall of cyclic annular heater all is provided with a plurality of heating mouths, and a plurality of the heating mouths are along the even setting of circumference interval of this cyclic annular heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310403028.9A CN116571986A (en) | 2023-04-14 | 2023-04-14 | Method and system for removing seals in steam turbines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310403028.9A CN116571986A (en) | 2023-04-14 | 2023-04-14 | Method and system for removing seals in steam turbines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116571986A true CN116571986A (en) | 2023-08-11 |
Family
ID=87542234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310403028.9A Pending CN116571986A (en) | 2023-04-14 | 2023-04-14 | Method and system for removing seals in steam turbines |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116571986A (en) |
-
2023
- 2023-04-14 CN CN202310403028.9A patent/CN116571986A/en active Pending
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