CN111648831A - Supercritical carbon dioxide turbine shaft end sealing failure protection device and method - Google Patents

Supercritical carbon dioxide turbine shaft end sealing failure protection device and method Download PDF

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Publication number
CN111648831A
CN111648831A CN202010427905.2A CN202010427905A CN111648831A CN 111648831 A CN111648831 A CN 111648831A CN 202010427905 A CN202010427905 A CN 202010427905A CN 111648831 A CN111648831 A CN 111648831A
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CN
China
Prior art keywords
seal
carbon dioxide
supercritical carbon
shaft end
failure protection
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Application number
CN202010427905.2A
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Chinese (zh)
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CN111648831B (en
Inventor
刘光旭
黄彦平
王俊峰
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Nuclear Power Institute of China
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Nuclear Power Institute of China
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/003—Preventing or minimising internal leakage of working-fluid, e.g. between stages by packing rings; Mechanical seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/14—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for responsive to other specific conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • F01K25/103—Carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

The invention provides a supercritical carbon dioxide turbine shaft end seal failure protection device and method. According to the method, the supercritical carbon dioxide turbine shaft end sealing failure protection device is adopted to carry out shaft end sealing and failure protection on the supercritical carbon dioxide turbine equipment. The device and the method for protecting the shaft end seal failure of the supercritical carbon dioxide turbine can realize the temporary seal of the supercritical carbon dioxide when the shaft end seal of the supercritical carbon dioxide turbine fails, and protect the safety of personnel and equipment.

Description

Supercritical carbon dioxide turbine shaft end sealing failure protection device and method
Technical Field
The invention relates to the technical field of advanced turbine equipment, in particular to a device and a method for protecting shaft end sealing failure of a supercritical carbon dioxide turbine.
Background
The compressor and the turbine are core equipment of a supercritical carbon dioxide power conversion system, belong to high-rotation-speed turbine equipment, and once the shaft end seal fails, a large amount of carbon dioxide is leaked to the site, so that the safety of site personnel is critical.
The method for ensuring the safety and the effectiveness of the shaft end seal of the turbine of the compressor is a key problem to be solved by the research and the development of the supercritical carbon dioxide compressor and the turbine, and the arrangement of the supercritical carbon dioxide compressor and the shaft end seal failure protection measures for ensuring the safety of personnel and equipment when the shaft end seal fails is very necessary.
At present, the supercritical carbon dioxide turbine equipment is still in the research and development stage, and no published measures for protecting the shaft end sealing failure of the supercritical carbon dioxide turbine equipment exist.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a device and a method for protecting the shaft end sealing failure of a supercritical carbon dioxide turbine, which are used for realizing the temporary sealing of supercritical carbon dioxide when the shaft end sealing failure occurs.
The invention provides a supercritical carbon dioxide turbine shaft end seal failure protection device which comprises a seal body arranged between a rotor and a cylinder and a failure seal assembly, wherein the failure seal assembly is arranged on the outer side of the seal body and can form a temporary mechanical seal structure to realize temporary sealing after the seal body fails.
According to one embodiment of the device for protecting the shaft end seal failure of the supercritical carbon dioxide turbine, the sealing body can realize the shaft end seal of the supercritical carbon dioxide turbine equipment under the normal sealing condition.
According to one embodiment of the supercritical carbon dioxide turbine shaft end seal failure protection device, the failure seal assembly comprises a fixed support, a static seal ring and a dynamic seal ring, the static seal ring is connected with the fixed support through an elastic element, the static seal ring can be separated from the dynamic seal ring under the action of the elastic element, and the static seal ring can be attached to the dynamic seal ring under the pushing action of leaked gas to form the temporary mechanical seal structure after the seal body fails.
According to one embodiment of the supercritical carbon dioxide turbine shaft end seal failure protection device, the fixed support and the static seal ring are arranged on the inner wall of the cylinder, the movable seal ring is arranged on the rotor, the static seal ring is located between the fixed support and the movable seal ring, and the movable seal ring and the static seal ring of the failure seal assembly form an S-shaped or snake-shaped passage under normal sealing conditions.
According to one embodiment of the supercritical carbon dioxide turbine shaft end seal failure protection device, the elastic element is a spring.
According to one embodiment of the supercritical carbon dioxide turbine shaft end seal failure protection device, the failure protection device further comprises an alarm control component, and the alarm control component can send out equipment stop signals and control the supercritical carbon dioxide turbine equipment to stop after the seal body fails.
The invention also provides a supercritical carbon dioxide turbine shaft end sealing failure protection method, which is used for performing shaft end sealing and failure protection on the supercritical carbon dioxide turbine equipment.
Compared with the conventional scheme, the device and the method for protecting the shaft end seal failure of the supercritical carbon dioxide turbine can realize the temporary seal of the supercritical carbon dioxide when the shaft end seal of the supercritical carbon dioxide turbine fails, and protect the safety of personnel and equipment. Under the normal sealing condition, the original sealing body of the turbine equipment completes the shaft end sealing of the turbine equipment, and the sealing static ring is separated from the sealing dynamic ring under the action of the elastic element; when the sealing body fails, carbon dioxide leaked from the inside of the turbine equipment pushes the sealing static ring to be attached to the sealing dynamic ring to form a temporary mechanical sealing structure, and meanwhile, a turbine equipment stop signal is sent out, so that temporary sealing of supercritical carbon dioxide in the unit is realized when the sealing body of the turbine shaft end of the supercritical carbon dioxide fails.
Drawings
Fig. 1 shows a schematic structural diagram of a supercritical carbon dioxide turbine shaft end seal failure protection device according to an exemplary embodiment of the invention.
Description of reference numerals:
1-rotor, 2-sealing body, 3-fixed support, 4-elastic element, 5-sealing static ring, 6-sealing dynamic ring, 7-cylinder and 8-pressure sensor.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Fig. 1 shows a schematic structural diagram of a supercritical carbon dioxide turbine shaft end seal failure protection device according to an exemplary embodiment of the invention.
According to an exemplary embodiment of the invention, as shown in fig. 1, the supercritical carbon dioxide turbine shaft end seal failure protection device comprises a sealing body 2 arranged between a rotor 1 and a cylinder 7, and a failure sealing component which is arranged outside the sealing body 2 and can form a temporary mechanical sealing structure to realize temporary sealing after the sealing body 2 fails. The outside of the sealing body 2 is the inside and outside with respect to the device, i.e. the failed sealing assembly is arranged in the device at an outer position with respect to the sealing body 2.
The sealing body 2 is actually an original sealing body of the turbine equipment, and can realize shaft end sealing of the supercritical carbon dioxide turbine equipment under a normal sealing condition.
The failure sealing assembly comprises a fixed support 3, a sealing static ring 5 and a sealing moving ring 6, wherein the sealing static ring 5 is connected with the fixed support 3 through an elastic element 4, the sealing static ring 5 can be separated from the sealing moving ring 6 under the action of the elastic element 4, and the sealing static ring 5 can be attached to the sealing moving ring 6 under the pushing action of leaked gas to form a temporary mechanical sealing structure after the sealing body 2 fails, so that the temporary sealing of supercritical carbon dioxide in turbine equipment is realized to protect the safety of personnel and equipment. Wherein the elastic element 4 may be a spring.
Specifically, the fixed support 3 is mainly used for controlling the position of the static sealing ring 5, and the static sealing ring 5 and the dynamic sealing ring 6 can be matched to form a temporary mechanical sealing structure. The fixed support 3 and the sealed stationary ring 5 are arranged on the inner wall of the cylinder 7, the sealed movable ring 5 is arranged on the rotor 1, the sealed stationary ring 5 is positioned between the fixed support 3 and the sealed movable ring 6, and the sealed movable ring and the sealed stationary ring of the failure sealing assembly form an S-shaped or snake-shaped passage under the normal sealing condition.
In order to form more favorable failure protection, the failure protection device of the invention also comprises an alarm control component, the alarm control component is preferably a pressure sensor 8, and the pressure sensor 8 sends out a device shutdown signal after detecting the pressure overrun and controls the shutdown of the supercritical carbon dioxide turbine device.
According to the supercritical carbon dioxide turbine shaft end sealing failure protection method, the supercritical carbon dioxide turbine shaft end sealing failure protection device is adopted to seal and protect the shaft end of the supercritical carbon dioxide turbine equipment.
Therefore, under the normal sealing condition, the sealing body 2 can complete shaft end sealing of turbine equipment, the sealing static ring 5 is separated from the sealing moving ring 6 under the action of the elastic element 4, when the sealing body 2 fails, carbon dioxide leaked from the interior of the turbine equipment can push the sealing static ring 5 to be attached to the sealing moving ring 6 to form a temporary mechanical sealing structure, and meanwhile, the pressure sensor 8 sends out a shutdown signal of the turbine equipment to realize temporary sealing of supercritical carbon dioxide in the turbine equipment.
In conclusion, the supercritical carbon dioxide turbine shaft end seal failure protection device can automatically operate under the action of upstream pressure after the original seal of turbine equipment fails and realize temporary seal, is realized without control logic, is safe and reliable, and is convenient for shutdown treatment.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.

Claims (7)

1. The utility model provides a super supercritical carbon dioxide turbine axle head seals failure protection device which characterized in that, failure protection device is including setting up seal and the failure seal subassembly between rotor and cylinder, the failure seal subassembly sets up in the seal outside and can form interim mechanical seal structure after the seal is inefficacy and realize interim sealing.
2. The supercritical carbon dioxide turbine shaft end seal failure protection device of claim 1 wherein the seal body is capable of effecting a shaft end seal of a supercritical carbon dioxide turbine plant under normal sealing conditions.
3. The supercritical carbon dioxide turbine shaft end seal failure protection device as claimed in claim 1, wherein the failure seal assembly comprises a fixed support, a static seal ring and a dynamic seal ring, the static seal ring and the fixed support are connected through an elastic element, wherein the static seal ring can be separated from the dynamic seal ring under the action of the elastic element, and the static seal ring can be attached to the dynamic seal ring under the pushing action of leaked gas to form the temporary mechanical seal structure after the seal body fails.
4. The supercritical carbon dioxide turbine shaft end seal failure protection device as recited in claim 4, wherein the fixed support and the static seal ring are fixedly disposed on the inner wall of the cylinder, the dynamic seal ring is disposed on the rotor, the static seal ring is disposed between the fixed support and the dynamic seal ring, and the dynamic seal ring and the static seal ring of the failed seal assembly form an S-shaped or serpentine path under normal sealing conditions.
5. The supercritical carbon dioxide turbine shaft end seal failure protection apparatus of claim 4 wherein the resilient element is a spring.
6. The supercritical carbon dioxide turbine shaft end seal failure protection device as claimed in claim 1, wherein the failure protection device further comprises an alarm control component, and the alarm control component can send out an equipment shutdown signal and control the supercritical carbon dioxide turbine equipment to shutdown after the seal body fails.
7. A supercritical carbon dioxide turbine shaft end seal failure protection method is characterized in that shaft end seal and failure protection of a supercritical carbon dioxide turbine device are carried out by adopting the supercritical carbon dioxide turbine shaft end seal failure protection device as claimed in any one of claims 1 to 6.
CN202010427905.2A 2020-05-20 2020-05-20 Supercritical carbon dioxide turbine shaft end seal failure protection device and method Active CN111648831B (en)

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CN202010427905.2A CN111648831B (en) 2020-05-20 2020-05-20 Supercritical carbon dioxide turbine shaft end seal failure protection device and method

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Application Number Priority Date Filing Date Title
CN202010427905.2A CN111648831B (en) 2020-05-20 2020-05-20 Supercritical carbon dioxide turbine shaft end seal failure protection device and method

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CN111648831B CN111648831B (en) 2024-05-07

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Citations (17)

* Cited by examiner, † Cited by third party
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CA2205877A1 (en) * 1996-06-28 1997-12-28 General Electric Company Brush seals and combined labyrinth and brush seals for rotary machines
WO2001007791A1 (en) * 1999-07-23 2001-02-01 Hitachi, Ltd. Turbo fluid machinery and dry gas seal used for the machinery
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WO2001007791A1 (en) * 1999-07-23 2001-02-01 Hitachi, Ltd. Turbo fluid machinery and dry gas seal used for the machinery
GB0113396D0 (en) * 2000-06-02 2001-07-25 Honda Motor Co Ltd Device for supplying seal air to bearing boxes of a gas turbine engine
EP1522691A1 (en) * 2003-10-08 2005-04-13 Aisin Seiki Kabushiki Kaisha Exhaust gas sealing system for turbocharger
US20050194745A1 (en) * 2004-03-08 2005-09-08 Alstom Technology Ltd. Sealing arrangement in turbine machinery
JP2012172642A (en) * 2011-02-24 2012-09-10 Mitsubishi Heavy Ind Ltd Seal structure and bypass air capacity control device of gas turbine
CN102220886A (en) * 2011-05-16 2011-10-19 西安交通大学 Device and method for automatically adjusting seal pressure of helical groove at shaft end of turbine
US20140027984A1 (en) * 2012-01-19 2014-01-30 Flowserve Management Company Abeyance Seal for High Temperature, High Pressure Applications
JP2014020330A (en) * 2012-07-20 2014-02-03 Toshiba Corp Turbine
JP5272278B1 (en) * 2012-11-22 2013-08-28 武史 畑中 SUPERCRITICAL ENGINE, SUPERCRITICAL ENGINE DRIVE POWER GENERATOR
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CN204476844U (en) * 2015-03-19 2015-07-15 山东钢铁股份有限公司 A kind of mechanical seal structure
CN106246919A (en) * 2016-10-09 2016-12-21 中国核动力研究设计院 One prevents pretightning force from relaxing and easily detachable packing seal structure
US20180266263A1 (en) * 2017-03-15 2018-09-20 Safran Aircraft Engines Air-fire seal and assembly comprising such a seal
US20190024523A1 (en) * 2017-07-24 2019-01-24 United Technologies Corporation Eddy current damper for lift off seal
CN109026179A (en) * 2018-08-02 2018-12-18 嘉兴博瑞涡轮增压技术有限公司 A kind of novel supercharger sealing structure

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