WO2011061142A1 - Low emission dry gas seal system for compressors - Google Patents
Low emission dry gas seal system for compressors Download PDFInfo
- Publication number
- WO2011061142A1 WO2011061142A1 PCT/EP2010/067456 EP2010067456W WO2011061142A1 WO 2011061142 A1 WO2011061142 A1 WO 2011061142A1 EP 2010067456 W EP2010067456 W EP 2010067456W WO 2011061142 A1 WO2011061142 A1 WO 2011061142A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gas
- seal
- sealing
- pressure
- dry gas
- Prior art date
Links
Classifications
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- 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
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
-
- 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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
-
- 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
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
- F01D11/06—Control thereof
-
- 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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/18—Lubricating arrangements
- F01D25/22—Lubricating arrangements using working-fluid or other gaseous fluid as lubricant
-
- 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
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
- F04D29/122—Shaft sealings using sealing-rings especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3464—Mounting of the seal
- F16J15/348—Pre-assembled seals, e.g. cartridge seals
- F16J15/3484—Tandem seals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/406—Sealings between relatively-moving surfaces by means of fluid by at least one pump
Definitions
- the present invention relates generally to compressors and, more specifically, to the provision of dry gas seal systems in compressors.
- a compressor is a machine which accelerates the particles of a compressible fluid, e.g., a gas, through the use of mechanical energy to, ultimately, increase the pressure of that compressible fluid.
- Compressors are used in a number of different applications, including operating as an initial stage of a gas turbine engine.
- centrifugal compressors in which the mechanical energy operates on gas input to the compressor by way of centrifugal acceleration which accelerates the gas particles, e.g., by rotating a centrifugal impeller through which the gas is passing.
- centrifugal compressors can be said to be part of a class of machinery known as "turbo machines" or “turbo rotating machines”.
- Centrifugal compressors can be fitted with a single impeller, i.e., a single stage configuration, or with a plurality of impellers in series, in which case they are frequently referred to as multistage compressors.
- Each of the stages of a centrifugal compressor typically includes an inlet conduit for gas to be accelerated, an impeller which is capable of providing kinetic energy to the input gas and a diffuser which converts the kinetic energy of the gas leaving the impeller into pressure energy.
- gases are used in centrifugal compressors, some of which are toxic or dangerous to the environment and/or to workers in the plants.
- centrifugal compressors employ sealing systems, usually placed on the ends of the shaft that supports the impeller(s), to prevent the gas from escaping from the compressor and contaminating the surrounding environment.
- Single rotor centrifugal compressors are usually provided with two separate seals as part of this sealing system, i.e., one for each end of the shaft, while in a overhung centrifugal compressor it is usually sufficient to seal the shaft end, located immediately downstream of the impeller.
- Dry gas seals can be described as non-contacting, dry-running mechanical face seals which include a mating or rotating ring and a primary or stationary ring. In operation, grooves in the rotating ring generate a fluid-dynamic force causing the stationary ring to separate and create a gap between the two rings.
- These seals are referred to as “dry” since they do not require lubricating oil which, among other things, greatly reduces their maintenance requirements.
- a tandem-type dry gas seal system includes a first seal 2 and a second seal 4, both contained in a single package.
- the first seal 2 operates to contain the total pressure of gas processed, while the second seal 4 acts as a back-up which is designed to operate only if the first seal 2 fails or leaks excessively.
- a conditioned gas flow coming from compressor discharge is injected upstream of seal 2 to isolate the dry gas seal from process gas.
- an external sealing gas source having a low sulfur content e.g., a so-called "sweet" gas is usually provided to isolate the process gas from the surroundings.
- a dedicated reciprocating compressor 6 that operates independently of the centrifugal compressor is used to feed the sealing gas system.
- the second seal 4 in the tandem may receive a lower pressure (e.g., below 10 Bar) of nitrogen as secondary sealing gas via a source 8 to ensure that no toxic/flammable gas escapes to the surroundings.
- Centrifugal compressors equipped with these types of dry gas sealing systems thus also require additional compressors whose function is solely to provide the sealing gas, thus making the overall system more complex.
- reciprocating compressors 6 may have greater maintenance requirements than even the centrifugal compressors which they are intended to serve.
- second seal 4 in the tandem configuration does provide a back-up capability, current dry gas seal systems are still not fault free, in which case they may undesirably release a certain amount of sealing gas into the atmosphere.
- Exemplary embodiments provide sealing mechanisms usable, e.g., for centrifugal compressors.
- a sealing mechanism includes first, second and third dry gas seals arranged in series. Each seal receives its own sealing gas and has its own venting mechanism. Sealing gas pressures which separate the process gas from the venting system remain low enough that a dedicated compressor for supplying the sealing gases is not needed.
- Advantages according to exemplary embodiments described herein include, for example, better control over potentially hazardous process gas and lower complexity and maintenance requirements associated with sealing mechanisms for centrifugal compressors.
- advantages are not to be construed as limitations of the present invention except to the extent that they are explicitly recited in one or more of the appended claims.
- a centrifugal compressor includes a rotor assembly including at least one impeller, a bearing connected to, and for rotatably supporting, the rotor assembly, a stator, a sealing mechanism disposed between the rotor assembly and the bearing, the sealing mechanism including a first dry gas seal, disposed proximate an inboard side of the sealing mechanism, and having a primary seal gas supplied thereto at a first pressure, a second dry gas seal, disposed adjacent to the first dry gas seal and having a primary buffer gas supplied thereto at a second pressure, and a third dry gas seal, disposed adjacent to the second dry gas seal and having a buffer gas supplied thereto at a third pressure.
- a method for sealing a centrifugal compressor having a rotor assembly including at least one impeller, a bearing connected to, and for rotatably supporting, the rotor assembly, and a stator includes the steps of blocking a process gas, which is pressurized by the centrifugal compressor, from reaching the bearing by using a combination of first, second and third dry gas seals in sequence, supplying the first dry gas seal with a primary seal gas at a first pressure, supplying the second dry gas seal, disposed adjacent to the first dry gas seal, with a primary buffer gas at a second pressure, and supplying the third dry gas seal, disposed adjacent to the second dry gas seal, with a buffer gas at a third pressure.
- Figure 1 illustrates a tandem sealing mechanism
- Figure 2 is a schematic view of a multistage-type centrifugal compressor, provided with sealing mechanisms according to exemplary embodiments;
- Figure 3 is a partial sectional view of an exemplary dry gas seal used in sealing mechanisms according to exemplary embodiments
- Figure 4 is a sectional view of a sealing mechanism including three dry gas seals according to an exemplary embodiment
- Figure 5 illustrates a sealing mechanism including input and output fluid controls according to exemplary embodiments.
- Figure 6 is a flowchart illustrating a method for sealing a compressor according to exemplary embodiments.
- FIG. 2 schematically illustrates a multistage, centrifugal compressor 10 in which such sealing systems may be employed.
- the compressor 10 includes a box or housing (stator) 12 within which is mounted a rotating compressor shaft 14 that is provided with a plurality of centrifugal impellers 16.
- the rotor assembly 18 includes the shaft 14 and impellers 16 and is supported radially and axially through bearings 20 which are disposed on either side of the rotor assembly 18.
- the multistage centrifugal compressor operates to take an input process gas from duct inlet 22, to accelerate the particles of the process gas through operation of the rotor assembly 18, and to subsequently deliver the process gas through outlet duct 24 at an output pressure which is higher than its input pressure.
- the process gas may, for example, be any one of carbon dioxide, hydrogen sulfide, butane, methane, ethane, propane, liquefied natural gas, or a combination thereof.
- sealing systems 26 are provided between the impellers 16 and the bearings 20, sealing systems 26 are provided to prevent the process gas from flowing to the bearings 20.
- the housing 12 is configured so as to cover both the bearings 20 and the sealing systems 26 to prevent the escape of gas from the centrifugal compressor 10.
- a balance drum 27 which compensates for axial thrust generated by the impellers 16, the balance drum's labyrinth seal 28 and a balance line 29 which maintains the pressure on the outboard side of the balance drum 27 at the same level as the pressure at which the process gas enters via duct 22.
- each of the sealing systems 26 includes three dry gas seals which together cooperate to seal the process gas from escaping toward the bearings 20.
- each of the three dry gas seals in the sealing system 26 can be implemented as, for example, shown in Figure 3.
- a dry gas seal 30 is seated on the compressor shaft 14 to block the flow of the process gas along the gas path 32 from the inboard side to the outboard side of the centrifugal compressor 10.
- Each dry gas seal 30 includes a rotating seat 34 which rotates with the compressor shaft and mates with a stationary ring 36.
- grooves formed in at least one of the rotating seat 34 and the stationary ring 36 have a pressurized fluid pumped therein which has the effect of generating a fluid dynamic force which causes the stationary ring 36 to separate from the rotating seat 34.
- Examples of these types of dry gas seals can be found in U.S. Patent Nos. 5,492,341 and 5,529,315, the disclosures of which are incorporated here by reference.
- Figure 4 illustrates a portion of a rotary machine, e.g., a centrifugal compressor, having a triple dry gas seal system 26 according to exemplary embodiments.
- the triple dry gas seal system 26 includes three individual dry gas seals 40, 42 and 44 arranged in series along the compressor shaft 14.
- a labyrinth seal 45 is disposed upstream of the triple dry gas seal system 26 (on the inboard side proximate the impellers) and a barrier seal 48 is disposed downstream of the triple dry gas seal system 26 on (i.e., on the outboard side proximate the bearings 20), although those skilled in the art will appreciate that this particular configuration is purely illustrative and that the labyrinth and/or barrier seals may be omitted from other embodiments.
- Each of the three dry gas seals 40, 42 and 44 has respective inlets and outlets for their respective sealing gases.
- first stage (primary) seal 40 has an inlet 46 and an outlet 48
- second stage (secondary) seal 42 has an inlet 50 and an outlet 52
- third stage (tertiary) seal 44 has an inlet 54 and an outlet 56.
- each of the three dry gas seals 40, 42 and 44 has rotating seats 58, 62, 66 and stationary rings 60, 64 and 68, respectively, and each of the three dry gas seals 40, 42 and 44 is designed to handle the maximum sealing pressure associated with the process gas.
- Figure 5 depicts a triple dry gas sealing system 26 according to exemplary embodiments from a fluid pressure point of view.
- the primary seal stage 40 is provided with conditioned (i.e., appropriately filtered, heated and controlled) process gas as the sealing gas.
- This sealing gas may, for example, be delivered at a pressure of 70 - 400 Bar, and provided to the first seal 40 at a pressure higher than process gas of, for example, 300 Bar via a pressure control valve (PCV) 70 and associated gas conditioning elements 72 (which are not necessarily limited to the heater and filter indicated in Figure 5, e.g., cooling elements or other gas conditioning elements could be provided as additional or alternative elements).
- the seal gas is automatically controlled in flow or in differential pressure by the PCV 70 in order to ensure the flow of conditioned gas in all operating conditions (e.g., pressurization, start-up, normal operation, shut down etc.).
- the secondary seal stage 42 is provided with fuel gas or other suitable sweet gas source as a primary buffer gas, which is provided to the dry gas seal 42 at, for example, 20 Bar via pressure control valve 74 and associated gas conditioning elements 76.
- the primary buffer gas normally sweet fuel gas or other suitable gas that is available in the plant
- the tertiary seal stage 44 may be provided with nitrogen as its buffer gas from a source which delivers the gas at a pressure of 4- 10 Bar, e.g., higher than the flare system pressure, and which can be controllably provided to the third dry gas seal 44 at 4 Bar by PCV 78 and associated gas conditioning elements 80. Note, however, that the provision of nitrogen to this third dry gas seal 44 is optional and, therefore, gas pathway elements 79 to the third dry gas seal 44 may be omitted. Moreover, the buffer gas (nitrogen in this example) may also be supplied to the barrier seal 81.
- the gas pressures through the sealing system 26 should generally be set such that P1>P2>P4>P3>P6>P5>P7, referring to the pressure zones illustrated in the figure, such that a stepwise decrease in pressure is exhibited through the zones.
- these pressure values are exemplary, they are sufficiently low that none of the sealing gas supply sources require the provision of an auxiliary (e.g., reciprocating) compressor to supply the sealing gas, e.g., as a non-limiting example supply pressures ranging from 1 - 50 Bar or, stated somewhat differently, lower than 51 Bar. This, in turn, renders exemplary embodiments more cost efficient and requires less maintenance than conventional compressor systems.
- Figure 5 also illustrates pressure controlled venting mechanisms for each of the first two of the three sealing stages of the sealing system 26.
- the primary seal 40 includes a venting mechanism 82 which returns process gas that escapes from the primary seal 40 back to a recovery system.
- the venting mechanism 82 includes, among other things, an optional PCV 84 set to an appropriate pressure level given the sealing gas pressure, in this example 10 Bar.
- the recovered seal gas venting mechanism 82 is also equipped with flow and pressure monitoring instrumentation which can monitor variations of flow and pressure (higher or lower) along the return path, which parameters may be indicative of a malfunction of the seals. These values are detected and can be used to generate system alarm or shutdown signals.
- the recovered process gas is then routed to a recovery system and injected into the process gas loop.
- the secondary seal 42 is equipped with a venting mechanism 86.
- the primary vent is equipped according to this exemplary embodiment, and like the recovered gas vent, with flow and pressure monitoring instrumentation, as well as with a PCV 88 to keep the pressure within a defined range.
- This pressure can be set to be higher than a pressure used in the plant flare system, to which venting mechanism 86 vents.
- the variation of flow and pressure (higher or lower) can also be used to detect and generate alarm or shutdown signals in the secondary seal venting system 86.
- the tertiary seal 44 also has a venting mechanism 90 which is sized to avoid high back pressure in case of a failure of the sealing mechanism 26, and which vents the nitrogen (or primary buffer gas) to the atmosphere.
- a method for sealing a centrifugal compressor having a rotor assembly including at least one impeller, a bearing connected to, and for rotatably supporting, the rotor assembly, and a stator includes the method steps illustrated in the flowchart of Figure 6. Therein, at step 100, a process gas, which is pressurized by the centrifugal compressor, is blocked from reaching the bearing by using a combination of first, second and third dry gas seals in sequence.
- exemplary embodiments provide for a sealing mechanism for a centrifugal compressor which is capable of preventing, or at least make it unlikely, that the potentially hazardous process gases will be released into the atmosphere. This is particularly useful, for example, in the presence of process gases such as hydrogen sulfide (H2S).
- H2S hydrogen sulfide
- these exemplary embodiments create seal mechanisms which are substantially impervious to dry gas for a centrifugal compressor that does not require the presence of another compressor which is dedicated to the generation of a highly pressurized sealing gas.
- sealing mechanisms as shown and described in the above exemplary embodiments have three dry gas seals, it will be appreciated that four or more dry gas seals provided in sequence could also be used according to other exemplary embodiments.
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- General Engineering & Computer Science (AREA)
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- Mechanical Sealing (AREA)
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Abstract
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Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201080062116.8A CN102713306B (en) | 2009-11-23 | 2010-11-15 | Low emission dry gas seal system for compressors |
RU2012120920/06A RU2537116C2 (en) | 2009-11-23 | 2010-11-15 | Dry gas seal system with low exhaust for compressors |
BR112012012224A BR112012012224A2 (en) | 2009-11-23 | 2010-11-15 | turbomachine, sealing method and gas dry sealing control system |
AU2010321070A AU2010321070A1 (en) | 2009-11-23 | 2010-11-15 | Low emission dry gas seal system for compressors |
CA2781711A CA2781711A1 (en) | 2009-11-23 | 2010-11-15 | Low emission dry gas seal system for compressors |
JP2012540359A JP2013511662A (en) | 2009-11-23 | 2010-11-15 | Low emission dry gas seal system for compressor |
MX2012005990A MX2012005990A (en) | 2009-11-23 | 2010-11-15 | Low emission dry gas seal system for compressors. |
EP10779776A EP2504582A1 (en) | 2009-11-23 | 2010-11-15 | Low emission dry gas seal system for compressors |
US13/511,470 US20130170961A1 (en) | 2009-11-23 | 2010-11-15 | Low emission dry gas seal system for compressors |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITCO2009A000051 | 2009-11-23 | ||
ITCO2009A000051A IT1397059B1 (en) | 2009-11-23 | 2009-11-23 | SEAL SYSTEM FOR DRY GAS, LOW EMISSION FOR COMPRESSORS |
Publications (1)
Publication Number | Publication Date |
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WO2011061142A1 true WO2011061142A1 (en) | 2011-05-26 |
Family
ID=42316102
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2010/067456 WO2011061142A1 (en) | 2009-11-23 | 2010-11-15 | Low emission dry gas seal system for compressors |
Country Status (12)
Country | Link |
---|---|
US (1) | US20130170961A1 (en) |
EP (1) | EP2504582A1 (en) |
JP (1) | JP2013511662A (en) |
KR (1) | KR20120096027A (en) |
CN (1) | CN102713306B (en) |
AU (1) | AU2010321070A1 (en) |
BR (1) | BR112012012224A2 (en) |
CA (1) | CA2781711A1 (en) |
IT (1) | IT1397059B1 (en) |
MX (1) | MX2012005990A (en) |
RU (1) | RU2537116C2 (en) |
WO (1) | WO2011061142A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
RU2537116C2 (en) | 2014-12-27 |
KR20120096027A (en) | 2012-08-29 |
CN102713306A (en) | 2012-10-03 |
RU2012120920A (en) | 2013-12-27 |
ITCO20090051A1 (en) | 2011-05-24 |
AU2010321070A1 (en) | 2012-06-14 |
MX2012005990A (en) | 2012-08-03 |
BR112012012224A2 (en) | 2016-04-19 |
IT1397059B1 (en) | 2012-12-28 |
US20130170961A1 (en) | 2013-07-04 |
EP2504582A1 (en) | 2012-10-03 |
CA2781711A1 (en) | 2011-05-26 |
JP2013511662A (en) | 2013-04-04 |
CN102713306B (en) | 2015-07-08 |
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