EP2284399A1 - Kühlvorrichtung und System dafür - Google Patents

Kühlvorrichtung und System dafür Download PDF

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Publication number
EP2284399A1
EP2284399A1 EP09008923A EP09008923A EP2284399A1 EP 2284399 A1 EP2284399 A1 EP 2284399A1 EP 09008923 A EP09008923 A EP 09008923A EP 09008923 A EP09008923 A EP 09008923A EP 2284399 A1 EP2284399 A1 EP 2284399A1
Authority
EP
European Patent Office
Prior art keywords
cooling
gas
cooling device
compressor
gas compressor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09008923A
Other languages
English (en)
French (fr)
Inventor
Mark P.J. Van Aarsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP09008923A priority Critical patent/EP2284399A1/de
Publication of EP2284399A1 publication Critical patent/EP2284399A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
    • F04D29/584—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps cooling or heating the machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/12—Combinations of two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0686—Units comprising pumps and their driving means the pump being electrically driven specially adapted for submerged use
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps

Definitions

  • the present invention relates to cooling systems in industry, particularly a cooling device for cooling a gas compressor.
  • Gas compression systems are used in a wide variety of applications, including air compression for powering tools, gas compression for storage and transport of gas, etc.
  • motors or gas turbines are provided for driving the compression mechanism to compress the gas.
  • Gas compressors like centrifugal gas compressors are usually driven by electric motors that are normally a standalone machine in a casing or within a casing that encases the motor and compressor. While this configuration prevents the risk of leaks from inside to outside of the housing or vice versa, it does not permit direct cooling of the motor or the compressor using ambient air or the environment surrounding the gas compressor. The motor or the gas compressor must therefore be cooled using a separate cooling medium.
  • the equipment design shall target the highest level of reliability since maintenance costs are extremely high, especially for heavy equipment at deeper water where heavy duty intervention vessels are very limitedly available. While intervention, even retrieval to the surface of heavy machinery is required; this has got enormous technical and financial impact.
  • the said object is achieved by providing a cooling device according to claim 1 and by a system according to claim 10.
  • the underlying idea is to have a separate cooling device for cooling a gas compressor, which is detachable from said gas compressor.
  • the cooling device comprises a cooling arrangement to cool a cooling medium.
  • the cooling device has got a first and second interface to supply and retrieve the cooling medium in and out of the gas.
  • Each one of the interfaces is provided with at least one valve to block the cooling medium or the gas in order to be able to separate the cooling device from the compressor.
  • These interfaces enable the cooling device to be detached from the gas compressor, so that the cooling device alone is moved to a different location, for maintenance, replacement or for a service if required.
  • the weight of the liquid cooling system will be approximately 10 % of the total compressor unit weight.
  • a separate retrievable cooling system could significantly reduce the cost and complexities, if the service requirement is for the cooling device.
  • there is no need to retrieve the complete gas compressor if there is a need for any servicing of the cooling device away from the site of installation of the gas compressor.
  • the third interface is adapted to receive a flushing medium.
  • HSE Health Safety Environment
  • the risk of spillage of hydrocarbons to the surrounding environment shall be minimal.
  • Providing a flushing medium in the third interface, prior to the detaching of the cooling device from the gas compressor will avoid this spillage.
  • the flushing medium is nitrogen or water. Flushing is required prior to detaching, to prevent the hydrocarbon spillage. Flushing with high pressured nitrogen or sea water will help to remove the excess hydrocarbon residues captured between the valves. Nitrogen or water are used because they are available in plenty and are less costly.
  • the cooling arrangement further comprises a pumping means for pumping the cooling medium. This provides enough pressure for the cooling medium to be circulated in the cooling device and into the gas compressor when the cooling device is in operation.
  • the cooling arrangement further comprises a heat exchanger adapted to cool the cooling medium.
  • the cooling medium which enters the gas compressor, should be cool enough to cool different hot parts inside the gas compressor. Since the cooling medium is basically reused and the cooling medium that comes out of the gas compressor is hot, there is a need to cool the cooling medium.
  • the heat exchanger ensures a continuous supply of cold cooling medium into the gas compressor.
  • first, second and third valves are adapted to be operated remotely from a place distant from the cooling device. This allows in having an automatic control for the valves, so that the operations of the valves and the process of detaching the cooling device from the gas compressor becomes much simpler.
  • the cooling medium is oil.
  • the applied oil should be safe environmental friendly oil, for example, transformer oil, where spillage to the seawater is considered acceptable for very small volumes.
  • the cooling arrangement further comprises a pressure compensating means to balance the pressure of a cooling medium to the pressure of a gas provided from a gas supply to the gas compressor. During the operation of the gas compressor, pressure variation can happen, which may turn hazardous to the gas compressor. Providing a pressure compensating means will ensure the maintenance of reliable pressure in the gas compressor.
  • the cooling device further comprises a third interface for connecting the cooling arrangement to the gas supply, and a third valve for controlling the gas flow through the third interface.
  • This further enables the pressure compensating means to be connected to the gas compressor system.
  • the third interface also helps in supplying gas for the working of the pressure compensating means.
  • the cooling device is adapted to cool a compressor module, a motor and bearings of the gas compressor.
  • the moving parts of the gas compressor generate a lot of heat.
  • the cooling device is used to cool these regions especially the motor and also the bearing brackets, containing the bearing stators using the cooling medium.
  • said cooling device is adapted to be mounted on the gas compressor having a common rotor axis for the compressor module and the motor. This enables the cooling device to be used in a gas compressor design, where the compressor module and the motor share a common rotor shaft.
  • the cooling device is vertically or horizontally connected to the gas compressor.
  • the cooling device is connected based on the orientation of the gas compressor.
  • the gas compressor having the compressor module and the motor, sharing a common shaft can be mounted vertically or horizontally. Based on this arrangement, the cooling device is connected to the gas compressor accordingly.
  • the compressor module and the motor are accommodated in a common gas-tight casing.
  • This provides a hermetically sealed design for example, with no shaft ends extruding the casing, which in-turn prevents any leakage of oil or hydrocarbons to the external environment making them more advantageous for deep sea applications.
  • the compressors particularly centrifugal compressors, must be provided with means to cool the motor during operation of the unit, in order to prevent degradation of the windings, insulation and the consequent damage to the motor, and with means to cool the cooling oil, so that it does not warm up excessively thereby degrading and loosing its cooling properties.
  • FIG 1 illustrates a block diagram of a cooling device 100 according to an embodiment of the invention.
  • the cooling device 100 for cooling a gas compressor 202 as shown in FIG 2 comprises a cooling arrangement 102 to cool a cooling medium 104, for example oil.
  • the invention will be explained with respect to a hermitically sealed gas compressor, even though the idea could be extended to other type of gas compressors.
  • the cooling device 100 has got a pressure compensating means 108, to balance the pressure of a cooling medium 104 to the pressure of a gas 106, provided from a gas supply 226 as shown in FIG 2 to the gas compressor 202.
  • Providing a pressure compensating means 108 will ensure the maintenance of reliable pressure in the gas compressor.
  • the cooling device 100 may even be realized without a typical pressure compensating means 108, for example by using a full delta pressure 'can' design for the motor, especially for the motor stator.
  • the main idea is to have a cooling device 100, which is detachable from the gas compressor 202, so that this can be transported separately in case of any service or maintenance requirement.
  • the cooling device has got plurality of interfaces.
  • a first interface 110 is used for receiving the cooling medium 104 from the gas compressor.
  • the first interface 110 has got a first valve 112, for controlling the flow of the cooling medium 104, from the gas compressor to the cooling arrangement 102.
  • a second interface 114 is used for supplying the cooling medium 104, which is cooled by the cooling arrangement 102 to the gas compressor 202.
  • the second interface 114 has an associated second valve 116, for controlling the flow of cooling medium from the cooling arrangement 102 to the gas compressor 202.
  • the first and the second interface acts as an inlet and an outlet for the cooling medium respectively.
  • the process of controlling the flow mentioned here with respect to the valves mainly involves the process of blocking the lines in case of retrieval of the cooling device from the gas compressor.
  • the cooling arrangement 102 mainly comprises a pumping means 122, for pumping the cooling medium 104 and a heat exchanger 124, adapted to cool the cooling medium 104.
  • the heat exchanger 124 is exposed to a surrounding medium.
  • the medium could be ambient water. If it is subsea operations, then the medium is sea water. Water at the deep sea, which is in abundance, is used to transfer the heat of the cooling medium 104 via the heat exchanger 124 by way of contact with the heat exchanger 124.
  • the controlling function of the valves mainly involves the process of blocking the lines in case of retrieving or while detaching the cooling device 100 from the gas compressor 202.
  • the cooling device 100 has a third interface 118 for connecting the cooling arrangement 102 to a gas supply 226, as shown in FIG 2 .
  • the third interface 118 has got an associated third valve 120, for controlling the gas connection between the gas supply 226 and the pressure compensating means 108.
  • This third interface 118 is adapted to receive a flushing medium.
  • the flushing medium can be for example, nitrogen or water.
  • the first, second and third valves associated with the cooling device 100 are adapted to be operated remotely from a place distant from the cooling device. In case of any retrieval to the surface for any maintenance, the retrieval would be done by a vessel where subsea intervention activities will be remote operated with a remote operated vehicle (ROV).
  • ROV remote operated vehicle
  • FIG 2 illustrates a block diagram of a system 200 for compressing gas according to an embodiment of the invention.
  • the gas compressor 202 for compressing gas generally has a compressor module 204 having a compressor rotor 206 with one or more compressor impellers 208, and an electric motor 210 having a stator 212 and a motor rotor 214 for driving the compressor rotor 206 of the gas compressor 202.
  • the compressor module 204 and the electric motor 210 are accommodated in a common gas-tight casing 216, which is provided with a gas inlet 218 and a gas outlet 220.
  • the compressor rotor 206 and the motor rotor 214 are arranged on a common rotor shaft 234, which are mounted using the bearings 222 and 224 in the gas compressor 202. Since the electric motor 210 and the compressor module 204 share a common pressurized casing there are no shaft-ends extruding the casing as seen in standard compressor designs. Hence there is absolutely no hazardous emission to the environment.
  • the cooling medium 104 completes a closed loop 232.
  • the closed loop comprises of the pumping means 122, the heat exchanger 124, the gas compressor 202 and the pressure compensating means 108.
  • the heat exchanger 124 can be a simple convection type, where cooling piping of the heat exchanger 124 is directly exposed to the cold seawater.
  • the pressure compensating means 108 could be a piston, bladder or membrane type with a pressure reference to compressor suction gas.
  • the loop supplies the cooling medium 104 to various parts in the gas compressor 204, for example the motor 210, the compressor module 204 and the bearings 222 and 224.
  • the compressor illustrated in the present invention could also be a multiphase pump and the suction gas might contain slugs of water, when used in deep sea applications.
  • the system further comprises a flushing medium supply line 228, which supplies the required flushing medium 230.
  • the relevant piping between gas supply 226 and the pressure compensating means 108 is filled with the hydrocarbon gas 106. In place of hydrocarbon gas any other alternate medium could be used. Goal is to avoid hydrocarbon spillage to the environment when the cooling device 100 is separated from the gas compressor 202.
  • the associated valves need to be closed; i.e. the third valve 120 and a corresponding valve 236 at the gas compressor side. These valves may be physically close to each other, but still there is a small amount of gas 106 in the line between the valves. By flushing with nitrogen or sea water, the hydrocarbons are removed.
  • the present invention introduces a cooling device 100 for cooling a gas compressor 202, which is detachable from said gas compressor 202.
  • the cooling device 100 comprises a cooling arrangement 102 to cool a cooling medium 104, which intern cools the hot parts inside the gas compressor 202.
  • the cooling device 100 has got interfaces to supply and retrieve the cooling medium 104 in and out of the gas compressor 202 and another interface to supply gas for the working of the pressure compensating means 108, each one controlled by the respective valves associated with the interfaces. These interfaces enable the cooling device to be detached from the gas compressor 202, so that the cooling device 100 alone is moved to a different location, for maintenance or for a service if required.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP09008923A 2009-07-08 2009-07-08 Kühlvorrichtung und System dafür Withdrawn EP2284399A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09008923A EP2284399A1 (de) 2009-07-08 2009-07-08 Kühlvorrichtung und System dafür

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09008923A EP2284399A1 (de) 2009-07-08 2009-07-08 Kühlvorrichtung und System dafür

Publications (1)

Publication Number Publication Date
EP2284399A1 true EP2284399A1 (de) 2011-02-16

Family

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EP09008923A Withdrawn EP2284399A1 (de) 2009-07-08 2009-07-08 Kühlvorrichtung und System dafür

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EP (1) EP2284399A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012163996A3 (en) * 2011-05-31 2013-07-18 Fmc Kongsberg Subsea As Subsea compressor directly driven by a permanent magnet motor with stator and rotor submerged in liquid
CN103746862A (zh) * 2013-11-11 2014-04-23 中国石油化工股份有限公司 基于移动互联网的hse管理运行监控和诊断方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5980218A (en) * 1996-09-17 1999-11-09 Hitachi, Ltd. Multi-stage compressor having first and second passages for cooling a motor during load and non-load operation
WO2005003512A1 (en) * 2003-07-02 2005-01-13 Kvaerner Oilfield Products As Subsea compressor module and a method for controlling the pressure in such a subsea compressor module
EP2103810A1 (de) * 2008-03-19 2009-09-23 Siemens Aktiengesellschaft Kompressoreinheit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5980218A (en) * 1996-09-17 1999-11-09 Hitachi, Ltd. Multi-stage compressor having first and second passages for cooling a motor during load and non-load operation
WO2005003512A1 (en) * 2003-07-02 2005-01-13 Kvaerner Oilfield Products As Subsea compressor module and a method for controlling the pressure in such a subsea compressor module
EP2103810A1 (de) * 2008-03-19 2009-09-23 Siemens Aktiengesellschaft Kompressoreinheit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012163996A3 (en) * 2011-05-31 2013-07-18 Fmc Kongsberg Subsea As Subsea compressor directly driven by a permanent magnet motor with stator and rotor submerged in liquid
US10794386B2 (en) 2011-05-31 2020-10-06 Fmc Kongsberg Subsea As Subsea compressor directly driven by a permanent magnet motor with stator and rotor submerged in liquid
CN103746862A (zh) * 2013-11-11 2014-04-23 中国石油化工股份有限公司 基于移动互联网的hse管理运行监控和诊断方法

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