JP2007529674A - Circulation device for rotary compressor, rotary compressor, and operation method of rotary compressor - Google Patents

Circulation device for rotary compressor, rotary compressor, and operation method of rotary compressor Download PDF

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Publication number
JP2007529674A
JP2007529674A JP2007503288A JP2007503288A JP2007529674A JP 2007529674 A JP2007529674 A JP 2007529674A JP 2007503288 A JP2007503288 A JP 2007503288A JP 2007503288 A JP2007503288 A JP 2007503288A JP 2007529674 A JP2007529674 A JP 2007529674A
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JP
Japan
Prior art keywords
gas
compressor
sealing
circulation
sealing gas
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Pending
Application number
JP2007503288A
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Japanese (ja)
Inventor
ニック ベーバー、アリエル
ミュラー、ヘルマン
Original Assignee
マン ターボ アクチェンゲゼルシャフト シュバイツMan Turbo Ag Schweiz
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Filing date
Publication date
Priority to EP20040405170 priority Critical patent/EP1577561A1/en
Application filed by マン ターボ アクチェンゲゼルシャフト シュバイツMan Turbo Ag Schweiz filed Critical マン ターボ アクチェンゲゼルシャフト シュバイツMan Turbo Ag Schweiz
Priority to PCT/EP2005/002820 priority patent/WO2005090793A1/en
Publication of JP2007529674A publication Critical patent/JP2007529674A/en
Pending legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/08Sealings
    • F04D29/10Shaft sealings
    • F04D29/102Shaft sealings especially adapted for elastic fluid pumps
    • F04D29/104Shaft sealings especially adapted for elastic fluid pumps the sealing fluid being other than the working fluid or being the working fluid treated
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/08Sealings
    • F04D29/10Shaft sealings
    • F04D29/12Shaft sealings using sealing-rings
    • F04D29/122Shaft sealings using sealing-rings especially adapted for elastic fluid pumps
    • F04D29/124Shaft sealings using sealing-rings especially adapted for elastic fluid pumps with special means for adducting cooling or sealing fluid

Abstract

The present invention relates to a circulation device (1) for sending a sealing gas to a sealing chamber of a dry gas sealing device (2b) of a rotary compressor (2a). The circulation device includes a pipeline (1a, 1b) that forms a fluid path connecting the device (1) to a sealing gas circuit, a compressor (1c), and a pipeline (1a) for guiding fluid. , 1b) including a heating device (1e). The circulation device also includes a control device (4) for controlling the compressor (1c) and the heating device (1e).

Description

  The present invention relates to a circulating device for a rotary compressor according to the preamble of claim 1. The invention also relates to a rotary compressor according to the preamble of claim 5. The invention also relates to a method for operating a rotary compressor according to the preamble of claim 9.

  Rotary compressors such as turbo compressors, gas turbines, steam turbines, or gas compressors are known to compress gases, especially hydrocarbons such as natural gas, and as a result between the housing and the rotating shaft. A non-contact dry gas seal is used to seal the resulting gap.

  These seals are disposed along the axis of rotation and isolate the processing chamber disposed within the machine housing and receiving pressure from ambient pressure. The sealing device is generally arranged in a sealing chamber isolated from the processing chamber and is preferably configured as a labyrinth seal. The sealing gas is supplied to the sealing chamber so that the gas necessary for sealing can be used. A gas from an external source such as nitrogen or a process gas compressed by a rotary compressor is suitable as a sealing gas. In order to supply the sealing gas to the sealing chamber via the sealing gas supply system, corresponding supply paths and passages are provided.

  The disadvantage of this non-contact dry gas seal is that they are frequently broken.

  Accordingly, it is an object of the present invention to propose an apparatus and method that allows a rotary compressor to be operated more advantageously, more favorably and more reliably.

  This object is met by a circulation device having the features of claim 1. The dependent claims 2 to 5 relate to further advantageous embodiments. This object is also met by a compressor having the features of claim 6. The dependent claims 7 and 8 relate to a further advantageously configured compressor. This object is also met by a method having the features of claim 9. The dependent claims 10 to 13 relate to further advantageous method steps.

  This object is fulfilled in particular by a circulation device that carries the sealing gas to the sealing chamber of the dry gas seal of the rotary compressor. The apparatus includes a conduit that forms a fluid path for coupling the apparatus to a sealing circuit. The apparatus includes a sealed gas compressor and a heating device coupled in fluid communication with the conduit. The apparatus also includes a controller that controls the sealed gas compressor and the heating device. A process gas such as natural gas is preferably used as the sealing gas.

  As an effect of the circulation device according to the present invention, a sealing gas heated so as not to deposit a liquid or solid substance such as a hydrate on the dry gas seal due to the dew point position is supplied to the sealing chamber. The sealing gas is partially relaxed through a dry gas seal so as to cool as a result of the Joule-Thomson effect. The device according to the invention or the method according to the invention ensures that no liquid or solid matter is deposited on the dry gas seal. This ensures that only gaseous matter is present in the dry gas seal and ensures reliable and long-term operation of the dry gas seal without being damaged even during long term shutdowns of the compressor.

  Process gas is preferably used as the sealing gas, although other gases may be used for sealing.

  This object is also met by a method of turning off a rotary compressor having a dry gas seal. The dry gas seal is supplied with heated sealing gas or process gas during shutdown.

  The method is also particularly advantageous when the rotary compressor is turned off and shut down without exhausting process gas during shutdown so that the rotary compressor pressure is essentially maintained. It is. Depending on the application, the pressure of the rotary compressor reaches, for example, between 10 and 500 bar. When the rotary compressor is turned off and the process gas is no longer discharged, the rotary compressor produces a process gas pressure equal to the suction pressure of the compressor. After the compressor shuts down, the process cools to ambient temperature over time, and the process gas pressure is essentially maintained. If the dew point of the process gas is higher than the ambient temperature, even solids such as liquids and hydrates can be deposited, especially on the dry gas seal. These deposits can damage the dry gas seal, especially when the compressor is run again. The method of the present invention has the effect that heated sealing gas or process gas is supplied to the dry gas seal so that deposition of liquids or solids is prevented.

  In an advantageous embodiment, the phase diagram of the process gas used is stored and no liquid or solid component is deposited on the dry gas seal based on the phase diagram and measurements such as temperature and / or pressure of the process gas. As such, the process gas is heated. The phase diagrams are based on the sealing gas or process gas used, respectively. Based on the specific components of each process gas pumped by the compressor, for example natural gas pumped, a phase diagram adapted according to that component is used. In a preferred embodiment, hydrocarbons (CnHm), such as methane, ethane, butane ... hectane, octane, are pumped, and the device or method according to the invention is also suitable for pumping other gases. ing. Therefore, the use of process gas hydrocarbons as the sealing gas is particularly desirable because this sealing gas deposits liquids or solids as early as temperatures between 20 and 50 degrees.

  The effect of the method of the invention is that the operating pressure is essentially maintained while the compressor is shut down for a long period of time, for example several days, without the risk of breaking the dry gas seal. The method according to the invention thus makes it possible to ensure that the compressor is turned off and restarted advantageously in terms of cost.

  A further advantage is that the compressor is subjected to pressure for a longer period of time while it is stopped. Therefore, it is not necessary to discharge the process gas during the stop. Process gas emissions are particularly problematic when the process gas has components that destroy the environment, such as when applying natural gas.

  The present invention will be described in detail with reference to embodiments.

  FIG. 1 shows an embodiment of a circulation device 1 communicated with a compressor 2. The circulation device 1 includes two process gas pipes 1a and 1b, and a pressure is increased between the process gas pipes 1a and 1b in order to suck a sealing gas or a process gas through the process gas pipe 1a. A gas compressor 1c, also referred to as a check valve 1f, is used for compressing and heating the sealing gas or process gas with the gas compressor 1c and the heating device, and subsequently sealing gas Is supplied to the compressor 2 via the process gas line 1b. In an advantageous embodiment, the gas compressor 1c provides a pressure increase of 1 to 2 bar of sealing gas or process gas to allow a circulating flow of gas. The heating device 1e is configured differently, and is disposed inside the process gas pipes 1a and 1b, for example. The gas compressor 1 also includes a pressure accumulator that is fluidly connected to the process lines 1a, 1b and that acts to damp pulsating vibrations generated by the compressor 1c.

  The gas compressor 1c is connected to the drive device 1d. The devices 1c and 1d are configured as a piston compressor with two cylinders, one cylinder acting as a drive element, the other cylinder acting as a compressor element, for driving the cylinder to the drive element Is supplied with compressed air.

  The circulation device 1 is configured as an independent unit, for example, all necessary components are arranged in a rack, for example, to incorporate an existing compressor 2. However, the circulation device 1 also forms part of the compressor 2.

  The circulation device 1 additionally includes a filter 1i arranged in the fluid path for purifying solid and / or liquid gases. The circulation device 1 further includes a temperature sensor 1h and / or a pressure sensor 1g. These components 1i, 1g, 1h are arranged in the circulation device 1 itself or, as shown in the embodiment according to FIG. 1, along with the components of the compressor 2, in particular along the sealing gas circuit. . In FIG. 1, the temperature sensor 1h is disposed so as to measure the temperature of the sealing gas in the dry gas sealing region. The temperature sensor 1h is also arranged at this position in order to measure the temperature of the sealing gas in the process gas pipe line 2m, 2n or 2o, for example.

  The electronic control device 4 serves to control the circulation device 1, which can form part of the circulation device 1, or part of the compressor 2, or as a separately added component. It may be configured.

  The electronic control unit 4 is connected to each controllable component 1d, 1e, 1g, 1h via a signal line 4a.

  The rotary compressor 2 is constructed in a manner known per se and includes a compressor housing 2a and a shaft 2c that is rotatably supported with the aid of a bearing 2d. A compressor wheel (not shown) is fixedly connected to the shaft 2c, and inside the compressor housing 2a, together with other components, a compression space connected in fluid communication with the suction side 2e and the pressure side 2h. Form.

  The gas seal 2b is arranged along the shaft 2c such that a sealing chamber is formed between them. The gas seal 2b is configured as a non-contact gas seal, preferably as a labyrinth seal. One sealing chamber is supplied with process gas via process gas lines 2m and 2o, while another sealing chamber is supplied with sealing gas or buffer gas such as nitrogen via supply paths 3a and 3c. Supplied. This sealing gas is sent, for example, to the flare via the discharge pipe 3b or to the atmosphere via the pipe 3d.

  The compressor 2 includes a first seal or process gas circuit 21, 2 m, 2 n along which process gas circulates during operation of the compressor 2. With the aid of the process gas line 2l, the process gas is withdrawn from the compressor housing 2a at a pressure slightly higher than the suction pressure and then fed to the filter 2k which blocks solid or liquid components before the process gas It is supplied to the sealing chamber shown in the figure via the gas pipelines 2m, 2n, 2o. The circulation device 1 according to the present invention forms a second sealing gas circuit, and the process gas is extracted from the suction side 2e and supplied to the compressor 1c with the aid of the process gas pipe 1a. The process gas line 1b opens to the filter 2k. Based on each pressure state, it acts without resistance so as to form either the first sealing gas circuit 2l, 2m, 2n, 2o or the second sealing gas circuit 1a, 1b, 2m, 2n, 2o. Two check valves 1f and 2p are provided.

During the normal operation of the compressor 2, the first sealing gas circuit is opened and the second sealing gas and the dry gas seal 2 b are opened so that the gas is continuously supplied via the pipe lines 2 n and 2 o. The sealing gas circuit is closed.

  When the rotary compressor 2 is turned off or while the rotary compressor 2 is stopped, the compressor 1 is turned on, so that the second sealing gas circuit is opened and the first The check valves 1f and 2p are automatically moved so that the sealing gas circuit is closed. During shutdown, the rotary compressor 2 is preferably not vented, so that the process gas pressure is equal to that in the housing 2s and the pressure is substantially higher than the suction pressure. When the rotary compressor 2 is stopped for a longer period, the process gas is cooled and as a result of the good sealing action of the dry gas seal, the pressure of the process gas is essentially maintained or slightly reduced. In this state, a very small proportion of the process gas flowing through the dry gas seal deposits any liquid or even solid material remaining in the dry gas seal, which breaks or breaks the dry gas seal, especially during the preparation of the compressor 2. There is a fear. To prevent this effect, the first sealing circuit is closed and the second sealing circuit is opened while the compressor 2 is stopped, and the process gas is heated slightly after being compressed in the compressor. This ensures that the heated process gas is supplied to the dry gas seal, thereby preventing deposition of liquid or solid material remaining on the dry gas seal.

  Instead of a process gas, another available sealing gas that can be heated and circulated to protect the dry gas seal from deposition may be utilized. For this purpose, the conduits 2n, 2o in the embodiment shown in FIG. 1 must be connected to the conduits 3a and / or 3c and the conduit 1a must be connected to the conduit 3b or 3d.

  In a further advantageous manner, the pressure and / or temperature of the sealing gas or process gas is measured by correspondingly provided sensors 1h, 1g and based on the measured temperature and / or pressure Gas or process gas is pumped or heated by the circulation device 1.

  FIG. 2 shows a two-phase diagram 5 of the process gas as a function of temperature T and pressure P. Lines 5a and 5c form a boundary between the distinct gas or liquid states of the process gas. Inside the line 5a there is a transition phase in which the process gas has a liquid or indeed a solid component. Line 5b represents a line forming a solid, that is, forming a hydrate.

  An important point of the method according to the invention is seen in the fact that the process gas or the sealing gas is heated so that it never reaches the state in which the liquid and solid matter delimited by the line 5a is deposited.

  In an advantageous manner, the associated individual two-phase diagrams are determined for each specific process gas or sealing gas and stored in the storage device 4b of the control device 4.

  FIG. 2 shows, by way of example, the pressure value and temperature value of the process gas in the compressor 2 at a specific time during shutdown at point 6. During the continuous cooling of the process gas, the point 6 moves at a substantially constant pressure along the line 6a of the phase diagram 5. With the help of the biphasic diagram 5 stored in the control device 4 and with the help of the temperature of the process gas measured by the sensor 1h, the point 6 is especially outside the line 5a in the dry gas seal area The process gas is pumped up and heated with the aid of the heating device 1e so that no liquid deposits or solid deposits are produced in the dry gas seal.

  The compressor shown in FIG. 1 is merely an example. The circulation device 1 according to the present invention or the method according to the present invention can be used with many different compressors, such as turbo compressors, gas turbines, steam turbines or gas compressors, etc., as well as various process gases and / or sealing gases. Used with.

FIG. 3 shows another configuration of the circulation device 1 in connection with the compressor 2. The first sealing gas circuit includes process gas lines 2l, 2m, 2n, 2o and a filter 2k. The second sealing gas circuit includes process gas lines 2l, 1a, 1b, 2n, 2o. The process gas line 2l extracts process gas from the compressor 2a in an intermediate stage. The circulation device 1 is provided as a detour to the process gas line 2m, and in FIG. 3, it is necessary for redirecting the liquid flow through either the line 2m or the circulation device 1 by the lines 1a and 1b. The valves to be performed are not shown. The circulation device 1 likewise includes an electronic control device 4 and a signal line 4a, which are not shown. The process gas line 2l also obtains process gas from the compressor 2a on the pressure side 2h.

The schematic detail drawing of the compressor provided with the circulation apparatus. Two-phase diagram of process gas. Schematic which shows another apparatus of the circulation apparatus of a compressor.

Claims (14)

  1. A circulation device (1) for transporting a sealing gas to a sealing chamber of a dry gas seal (2b) of a rotary compressor (2a), the fluid path for connecting the device (1) with a sealing gas circuit A compressor (1c) and a heating device (1e) connected in fluid communication with the conduit (1a, 1b), and the compressor (1c) ) And a control device (4) for controlling the heating device (1e).
  2. The circulation device (1) according to claim 1, further comprising a filter (1i) arranged along a fluid path of the conduit (1a, 1b).
  3. A temperature sensor (1h) is arranged to measure the temperature of the sealing gas in the sealing gas circuit, and the control device (4) detects the value of the temperature sensor (1h) and uses the measured value as a measured value. The circulation device (1) according to claim 1 or 2, characterized in that the heating device (1e) is controlled on the basis.
  4. The control device (4) includes a phase diagram (5) storage means (4b), and the heating device (1e) is controlled based on the measured values of the phase diagram (5) and / or the temperature sensor (1h). 4. Circulation device (1) according to claim 3, characterized in that the control device (4) is configured.
  5. The circulation device (1) according to any one of claims 1 to 4, wherein the compressor (1c) comprises a compressed air drive.
  6. Compressor (2) comprising a circulation device (1) according to any one of claims 1 to 5, characterized in that the conduit (1a, 1b) forms part of the sealing gas circuit. .
  7. The compressor (2) of claim 6, wherein the sealing gas circuit is configured to direct process gas.
  8. The compressor (2) includes a first sealing gas circuit (21, 2m, 2n, 2o), and the compressor (2) includes a second sealing gas circuit (1a, 1b, 2n, 2o), and the valve (1f, 2p) is arranged such that either the first sealing gas circuit or the second sealing gas circuit is fluid permeable through the valve (1f, 2p) The compressor (2) according to claim 6 or 7, characterized in that
  9. A method of turning off a rotary compressor (2) having a dry gas seal (2b), wherein the dry gas seal (2b) is supplied with a heated sealing gas during a stoppage. Method.
  10. The method according to claim 9, wherein a process gas is used as the sealing gas.
  11. 11. Method according to claim 9 or 10, characterized in that the pressure of the process gas is not reduced during shutdown and the rotary compressor (2a) is restarted after shutdown.
  12. 12. The pressure and / or temperature of the sealing gas or process gas is measured, and the sealing gas or process gas is heated based on the measured temperature and / or pressure. The method as described in any one of.
  13. A phase diagram corresponding to the sealing gas or the process gas is stored, and the sealing gas or the process gas is heated so that no liquid or solid component is deposited on the dry gas seal (2b). The method according to any one of claims 9 to 12.
  14. A compressor or compressor system operated by the method according to any one of claims 9 to 13.
JP2007503288A 2004-03-19 2005-03-17 Circulation device for rotary compressor, rotary compressor, and operation method of rotary compressor Pending JP2007529674A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20040405170 EP1577561A1 (en) 2004-03-19 2004-03-19 Device for circulating and heating sealing gas in a centrifugal compressor
PCT/EP2005/002820 WO2005090793A1 (en) 2004-03-19 2005-03-17 Circulation device for a rotary compressor, rotary compressor, and method for operating the same

Publications (1)

Publication Number Publication Date
JP2007529674A true JP2007529674A (en) 2007-10-25

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JP2007503288A Pending JP2007529674A (en) 2004-03-19 2005-03-17 Circulation device for rotary compressor, rotary compressor, and operation method of rotary compressor

Country Status (4)

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EP (2) EP1577561A1 (en)
JP (1) JP2007529674A (en)
NO (1) NO20064737L (en)
WO (1) WO2005090793A1 (en)

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JP2014529709A (en) * 2011-08-03 2014-11-13 ジョン クレーン インコーポレーテッド Seal gas monitoring and control system

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Publication number Publication date
EP1577561A1 (en) 2005-09-21
WO2005090793A1 (en) 2005-09-29
EP1725776A1 (en) 2006-11-29
NO20064737L (en) 2006-10-19

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