EP2156056B1 - Verfahren zur druckregelung eines sperrmediums in einer fördereinrichtung und fördereinrichtung für ein derartiges verfahren - Google Patents

Verfahren zur druckregelung eines sperrmediums in einer fördereinrichtung und fördereinrichtung für ein derartiges verfahren Download PDF

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Publication number
EP2156056B1
EP2156056B1 EP08749736A EP08749736A EP2156056B1 EP 2156056 B1 EP2156056 B1 EP 2156056B1 EP 08749736 A EP08749736 A EP 08749736A EP 08749736 A EP08749736 A EP 08749736A EP 2156056 B1 EP2156056 B1 EP 2156056B1
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EP
European Patent Office
Prior art keywords
pressure
barrier fluid
pump
medium
pump unit
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.)
Active
Application number
EP08749736A
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German (de)
English (en)
French (fr)
Other versions
EP2156056A1 (de
Inventor
Thomas Felix
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.)
Sulzer Pumpen AG
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Sulzer Pumpen AG
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Filing date
Publication date
Application filed by Sulzer Pumpen AG filed Critical Sulzer Pumpen AG
Priority to EP08749736A priority Critical patent/EP2156056B1/de
Publication of EP2156056A1 publication Critical patent/EP2156056A1/de
Application granted granted Critical
Publication of EP2156056B1 publication Critical patent/EP2156056B1/de
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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
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/106—Shaft sealings especially adapted for liquid pumps
    • F04D29/108—Shaft sealings especially adapted for liquid pumps the sealing fluid being other than the working liquid or being the working liquid treated
    • 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
    • F04D29/126—Shaft sealings using sealing-rings especially adapted for liquid pumps
    • F04D29/128—Shaft sealings using sealing-rings especially adapted for liquid pumps with special means for adducting cooling or sealing fluid

Definitions

  • the invention relates to a method for pressure control of a barrier medium in a conveyor according to the preamble of claim 1 and a conveyor for such a method according to the preamble of claim 4. Similar methods and Forder respondeden are from the document US 5769427 A known.
  • Conveying media such as fluids typically include a pump unit having a shaft and a pump housing and a drive unit mechanically coupled to the pump unit and a shaft seal assembly sealing the pump housing from the shaft.
  • High demands are placed on the shaft seal arrangement when the pump unit and drive unit are arranged in a common housing or pressure vessel. Serious damage can occur to the conveyor if the pumped medium, which depending on the application may also contain solids, contaminates critical parts such as bearings. In such a case, not infrequently, the entire conveyor must be overhauled.
  • the common housing or the pressure vessel is normally filled with a barrier medium and a pressure control system ensures that the pressure of the blocking medium in the housing or pressure vessel is higher than the pressure of the pumped medium in the pump unit to escape the fluid into the housing or in to prevent the pressure vessel.
  • pressure / volume compensators In current pressure control systems, such as those used in underwater conveyors for crude oil, either pressure / volume compensators or electro-hydraulic pressure valves are used.
  • pressure / volume compensators results in a comparatively complicated pressure control system with a corresponding number of components and connections.
  • pressure / volume compensators include resilient partitions that are susceptible to material fatigue. If electrohydraulic pressure valves are used, electronic pressure sensing and control is required and there are delays in the response time of the pressure control system.
  • the object of the invention is to provide a method for pressure control of a barrier medium in a conveyor and a conveyor for such a method, which can be ensured that the pressure of the barrier medium is higher than the pressure of the pumped medium in the pumping unit, and which are simple and reliable, manage with few components for the pressure control and have a relatively short reaction time.
  • a fluid is conveyed by means of the same.
  • the conveyor comprises for this purpose a pump unit with a shaft and a pump housing, a drive unit which is mechanically coupled to the pump unit, and a shaft seal arrangement which seals the pump housing with respect to the shaft.
  • the barrier medium is supplied via a supply line to the shaft seal arrangement and / or to a common housing, in which the pump unit and drive unit are arranged to prevent leakage of the pumped fluid from the pump housing.
  • the pressure of the supplied blocking medium is increased when a pressure difference between the pressure of the supplied blocking medium and a detected pressure of the pumped medium in the pumping unit falls below a predetermined value, and for this purpose a differential pressure-reducing valve, wherein the supply line through the open valve is continuously connected to a source of barrier medium, the pressure of which is above the pressure of the pumped medium in the pump unit.
  • its pressure is more than the predetermined value above the pressure of the pumped medium in the pumping unit.
  • the valve is closed again when the pressure difference between the pressure of the supplied blocking medium and the detected pressure of the pumped medium in the pumping unit rises above a further predetermined value or the predetermined value.
  • the pressure of the supplied blocking medium is lowered when a pressure difference between the pressure of the supplied blocking medium and the detected pressure of the pumped medium in the pumping unit exceeds a second predetermined value, for which purpose a differential pressure relief valve is opened, and the open valve Barrier medium is discharged, in particular via a connecting line to the pump housing or a return or an outlet for the barrier medium.
  • this second valve is closed again when the pressure difference between the pressure of the supplied blocking medium and the detected pressure of the pumped medium in the pumping unit is below a further predetermined value or the second predetermined value.
  • heat is additionally dissipated from the conveying device, in particular heat of the drive unit, in that the blocking medium is circulated in a cooling circuit with a heat exchanger.
  • the inventive conveying device for conveying a conveying medium comprises a pump unit with a shaft and with a pump housing, a drive unit which is mechanically coupled to the pump unit, a shaft seal arrangement which seals the pump housing relative to the shaft, and a control system for pressure control of a barrier medium.
  • the control system includes a source of pressurized barrier medium via a supply line to the shaft seal assembly and / or a common housing is connected, in which the pump unit and drive unit are arranged to supply blocking medium and to prevent leakage of the pumped fluid from the pump housing.
  • the control system additionally includes a differential pressure reducing valve disposed in the supply line, the valve opening when a pressure difference across the valve between the pressure of the supplied blocking medium and a detected pressure of the delivery medium in the pumping unit falls below a predetermined value To increase the pressure of the supplied blocking medium, and wherein the valve closes again, if necessary, when the voltage applied to the valve pressure difference exceeds another predetermined value or the predetermined value.
  • the source or the memory is designed such that the pressure of the blocking medium made available therefrom is more than the predetermined value above the pressure of the pumped medium in the pumping unit.
  • control system additionally includes a differential pressure relief valve, said second valve opens when the voltage applied to this valve pressure difference between the pressure of the supplied barrier medium and a detected pressure of the pumped medium in the pumping unit exceeds a second predetermined value, and wherein said second valve If necessary, closes again when the voltage applied to the valve pressure difference falls below a further predetermined value or the second predetermined value.
  • control system additionally includes a cooling circuit with a heat exchanger for the barrier medium to dissipate heat of the conveyor, such as heat of the drive unit.
  • the pressure valve or, if two pressure valves are used each of the pressure valves has a control input for pressure sensing, which is connected to the pump unit to detect the pressure inside the pump unit, and an inlet and an outlet for the Blocking medium, wherein occasionally the inlet of the differential pressure reducing valve is connected to a first part of the supply line for the pressurized blocking medium, and the outlet of the differential pressure reducing valve and the inlet of the differential pressure relief valve are each case-to-case connected to a second part of the supply line and the outlet of the differential pressure relief valve is occasionally connected to a connection line communicating with the pump housing or with a return or drain for the barrier medium.
  • this includes a common housing in which the pump unit and drive unit are arranged, for example, a housing which is designed as a pressure vessel.
  • the inventive method for pressure control of a barrier medium and the inventive conveyor have the advantage that only two pressure valves are needed to maintain a desired pressure difference between the pressure of the supplied barrier medium and the pressure of the pumped medium in the pumping unit, which is the number of components required for pressure control kept to a minimum.
  • the pressure valves are actuated directly by the pressure difference between the pressure of the supplied blocking medium and the pressure of the pumped medium in the pumping unit, whereby the reaction time of the pressure control can be kept short.
  • Another advantage is that the idle state of the pressure valves is predetermined by a spring, which in a fault, a clear behavior of the valves is ensured. Due to the purely hydraulic coupling signal transmission errors, as they can occur in electronic pressure control systems, also excluded.
  • the inventive method for pressure control and the inventive conveyor thus have a high reliability, since only a few and exclusively mechanical components for pressure control are needed.
  • FIG. 1 shown embodiment of a conveyor for conveying a pumped medium comprises a pump unit 11 with a shaft 12 and a pump housing 13, a drive unit 17 which is mechanically coupled to the pump unit, a shaft seal assembly 16.1, 16.2, the pump housing 13 relative to the shaft 12th and a control system for pressure control of a barrier medium, which is described in more detail in the following section.
  • the shaft seal assembly 16.1, 16.2 may be formed, for example, as a mechanical seal, brush seal assembly and / or stuffing box, with a continuous shaft 12 is provided on both sides of the pump housing 13, a shaft seal.
  • the drive unit 17 may, for example, as in Fig. 1 shown containing an electric motor with a stator and a rotor, which is conveniently coupled to the shaft 12 of the pumping unit.
  • the conveying device may comprise a common housing 18, in which the pump unit 11 and drive unit 17 are arranged are, as well as occasionally several bearings for supporting the shaft 12 or the drive rotor, for example, one or more radial bearings 19.1 - 19.4 or one or more thrust bearings 19.5, 19.6.
  • the common housing 18 may be formed, for example, for underwater applications as a pressure vessel, which seals the pumping unit 11 and drive unit 17 arranged therein against the outside.
  • the control system for pressure control of a barrier medium includes a source 3, 4 and / or a reservoir 6 for a pressurized barrier medium and a supply line 5.1, 5.2, which is connected to the source or the memory to barrier medium to a shaft seal assembly 16.1, 16.2 and / or to supply to a common housing 18 in which the pump unit 11 and drive unit 17 are arranged to prevent leakage of the pumped liquid from the pump housing 13.
  • the control system additionally includes a differential pressure pressure reducing valve 1, which is arranged in the supply line 5.1, 5.2, wherein the valve opens when a voltage applied to the valve pressure difference between the pressure of the supplied blocking medium and a detected pressure of the pumped liquid in the pumping unit 11 below a predetermined Value decreases to increase the pressure of the supplied blocking medium, and the valve closes again if necessary, when the voltage applied to the valve pressure difference exceeds another predetermined value or the predetermined value.
  • the source 3, 4 or the memory 6 is formed such that the pressure of the blocking medium made available therefrom is more than the predetermined value above the pressure of the pumped medium in the pumping unit 11.
  • the source 3, 4 may for example contain a reservoir 3 for barrier medium and / or a pump 4 to increase the pressure of the barrier medium.
  • the memory 6 can be designed as a pressure vessel.
  • non-corrosive liquids and / or liquid media with lubricating action can be used as barrier media.
  • a gaseous barrier medium such as an inert gas.
  • control system additionally includes a differential pressure overflow valve 2, said second valve opens when the voltage applied to this valve pressure difference between the pressure of supplied blocking medium and a detected pressure of the pumped medium in the pumping unit 11 exceeds a second predetermined value, and wherein this second valve, if necessary, closes again when the voltage applied to the valve pressure difference falls below a further predetermined value or the second predetermined value.
  • control system additionally includes a cooling circuit 20 with a heat exchanger 21 for the barrier medium to dissipate heat from the conveyor 10, such as heat of the drive unit 17.
  • a cooling circuit 20 with a heat exchanger 21 for the barrier medium to dissipate heat from the conveyor 10, such as heat of the drive unit 17.
  • blocking medium is supplied on one side of the drive unit, passed in the common housing 18 to or through the drive unit and discharged on the opposite side of the drive unit through the cooling circuit.
  • a circulating pump 22 for circulating the blocking medium can be provided in the cooling circuit, wherein the circulating pump can be arranged, for example, in the interior of the common housing and mechanically coupled to the drive unit 17.
  • the barrier medium can in principle be fed into it at any point.
  • the blocking medium coming from the supply line 5.2 can be supplied to the shaft seal arrangement 16.1, 16.2 and / or fed to one or more of the bearings 19.1-19.6 and / or into the cooling circuit 20 mentioned in the preceding section.
  • each of the pressure valves 1, 2 has a control input for pressure detection, which is coupled via a connecting line 7 with the interior of the pumping unit 11, for example pneumatically and / or hydraulically to detect the pressure inside the pumping unit, and a Inlet and an outlet for the barrier medium, wherein occasionally the inlet of the differential pressure reducing valve 1 is connected to a first part 5.1 of the supply line for the pressurized blocking medium, and the outlet of the differential pressure-reducing valve and the inlet of Differential pressure relief valve 2 are each case connected to a second part 5.2 of the supply line, and the outlet of the Differenzdrucküberströmventils is occasionally connected to a connecting line 9, which is in communication with the pump housing 13 or with a return or a drain for the barrier medium.
  • the return can be connected, for example, with a reservoir 3 for the barrier medium.
  • the connecting line 7, with which the control inputs are connected to the pressure detection with the interior of the pump unit 11, is advantageously connected to a point in the pump unit, where the pressure of the pumped medium is comparatively high and / or the highest sealed by the shaft seal assembly 16.1, 16.2 Process pressure corresponds.
  • each of the pressure valves 1, 2 may be equipped with a second control input for pressure detection, which may be occasionally connected to the second part 5.2 of the supply line.
  • the second control input of the differential pressure-reducing valve 1 connected to the outlet of the differential pressure-reducing valve or the second control input of the differential pressure relief valve 2 with the inlet of the latter.
  • check valves 8.1 - 8.3 are provided at critical points, for example, a check valve 8.1 between the first part 5.1 of the supply line and the reservoir 3 of the source to prevent the backflow of barrier medium in the reservoir, and / or a check valve 8.2 in the first part 5.1 of the supply line to prevent backflow into the memory 6, and / or a check valve 8.3 in the connecting line 9 to the interior of the pump to prevent the backflow of fluid into the control system.
  • a conveying medium is conveyed by means of the conveyor 10.
  • the conveyor 10 comprises for this purpose a pump unit 11 with a shaft 12 and a pump housing 13, a drive unit 17 which is mechanically coupled to the pump unit, and a shaft seal assembly 16.1, 16.2, which seals the pump housing 13 relative to the shaft 12.
  • the barrier medium is supplied via a supply line 5.1, 5.2 to the shaft seal assembly and / or to a common housing 18, in which the pump unit 11 and drive unit 17 are arranged to prevent leakage of the fluid from the pump housing.
  • the pressure of the supplied blocking medium is increased when a pressure difference between the pressure of the supplied blocking medium and a detected pressure of the pumped medium in the pumping unit 11 drops below a predetermined value, and this a differential pressure-reducing valve 1 is opened, the supply line 5.1, 5.2 on the open valve is continuously connected to a source 3, 4 for blocking medium, the pressure of which is above the pressure of the pumped medium in the pumping unit 11.
  • their pressure is more than the predetermined value above the pressure of the pumped medium in the pumping unit.
  • the differential pressure pressure reducing valve 1 is closed again when the pressure difference between the pressure of the supplied blocking medium and the detected pressure of the pumped medium in the pumping unit 11 rises above a further predetermined value or the predetermined value.
  • the pressure of the supplied blocking medium is lowered when a pressure difference between the pressure of the supplied blocking medium and the detected pressure of the pumped medium in the pumping unit 11 exceeds a second predetermined value, for which purpose a differential pressure relief valve 2 is opened, and Barrier medium is discharged via the open valve, for example via a connecting line 9 to the pump housing 13 or a return or an outlet for the barrier medium.
  • the differential pressure overflow valve 2 is closed again when the pressure difference between the pressure of the supplied blocking medium and the detected pressure of the pumped medium in the pumping unit 11 drops below a further predetermined value or the second predetermined value.
  • the pressure of the pumped medium in the pump unit 11 may vary depending on working and operating conditions.
  • the pressure of the barrier medium supplied via the supply line 5.1, 5.2 may also vary, mainly as a result of temperature changes which cause a corresponding volume change.
  • the pressure of the conveying medium in the pumping unit 11 is advantageously detected at a point where the highest pressure to be sealed by the shaft sealing arrangement 16.1, 16.2 occurs, for example, in a chamber which precedes the shaft seal arrangement 16.2 in the direction of the interior of the pump housing 13.
  • the thus detected or detected pressure of the pumped medium is referred to below as the reference pressure p ref .
  • the method described above and the embodiments described above allow to keep the pressure difference ⁇ p between the pressure of the supplied blocking medium and the detected reference pressure p ref constant even under changing operating and operating conditions.
  • the operation of the pressure control is explained in the following section with reference to a numerical example.
  • the stated pressure values are only to be understood as an example, since the method according to the invention can be used in a wide pressure range.
  • the mean pressure difference .DELTA.p between the pressure of the supplied blocking medium and the reference pressure p ref determined in the pump unit can be between 5 bar and 50 bar or between 2 bar and 100 bar and the fluctuation width of the regulated pressure difference between ⁇ 2 bar and ⁇ 20 bar or between ⁇ 0.5 bar and ⁇ 30 bar.
  • a pressure difference of ⁇ p 20 bar should be kept constant within ⁇ 5 bar.
  • the differential pressure pressure reducing valve 1 opens when the pressure difference .DELTA.p below a predetermined value, ie in the present case falls below 15 bar, the supply line 5.1, 5.2 through the open valve continuously with the source 3, 4 and the pressurized storage 6 for Barrier medium is connected, and the pressure of supplied blocking medium is increased accordingly.
  • the differential pressure pressure reducing valve 1 is closed again.
  • the differential pressure overflow valve 2 opens when the pressure difference .DELTA.p is above a predetermined second value, ie in the present case over 25 bar, being discharged via the open valve barrier medium, for example via a connecting line 9 to the pump housing 13.
  • a predetermined second value ie in the present case over 25 bar
  • the method described for pressure control of a barrier medium in a conveyor and the described conveyor are simple and reliable and allow to maintain the pressure difference between the pressure of the supplied barrier medium and the pressure of the pumped medium in the pump unit under changing operating and operating conditions.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Jet Pumps And Other Pumps (AREA)
EP08749736A 2007-05-15 2008-04-25 Verfahren zur druckregelung eines sperrmediums in einer fördereinrichtung und fördereinrichtung für ein derartiges verfahren Active EP2156056B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08749736A EP2156056B1 (de) 2007-05-15 2008-04-25 Verfahren zur druckregelung eines sperrmediums in einer fördereinrichtung und fördereinrichtung für ein derartiges verfahren

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07108274 2007-05-15
PCT/EP2008/055075 WO2008138730A1 (de) 2007-05-15 2008-04-25 Verfahren zur druckregelung eines sperrmediums in einer fördereinrichtung und fördereinrichtung für ein derartiges verfahren
EP08749736A EP2156056B1 (de) 2007-05-15 2008-04-25 Verfahren zur druckregelung eines sperrmediums in einer fördereinrichtung und fördereinrichtung für ein derartiges verfahren

Publications (2)

Publication Number Publication Date
EP2156056A1 EP2156056A1 (de) 2010-02-24
EP2156056B1 true EP2156056B1 (de) 2011-06-15

Family

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EP08749736A Active EP2156056B1 (de) 2007-05-15 2008-04-25 Verfahren zur druckregelung eines sperrmediums in einer fördereinrichtung und fördereinrichtung für ein derartiges verfahren

Country Status (5)

Country Link
US (1) US9303654B2 (pt)
EP (1) EP2156056B1 (pt)
AT (1) ATE513134T1 (pt)
BR (1) BRPI0811580B1 (pt)
WO (1) WO2008138730A1 (pt)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110210513A1 (en) * 2010-02-26 2011-09-01 General Electric Company Non-metallic brush seal
US20130136634A1 (en) * 2010-06-22 2013-05-30 Vetco Gray Scandinavia As Motor and pump barrier fluids pressure regulation system in a subsea motor and pump module
EP2669552A1 (de) * 2012-05-31 2013-12-04 Sulzer Pumpen Ag Dichtungsanordnung für eine rotierende Welle
US9482345B2 (en) * 2012-10-04 2016-11-01 Sulzer Management Ag Sealing arrangement for a rotating shaft
GB2511476A (en) * 2012-12-07 2014-09-10 Thomas Andreas Guenther Device and system for hydrocarbon conversion
GB201304435D0 (en) * 2013-03-12 2013-04-24 Aes Eng Ltd Mechanical Seal Support System
EP2914860B1 (de) * 2014-01-21 2017-05-17 DEPAC Anstalt (Establishment) Aggregat zur umwälzung eines sperrfluids
NO338790B1 (no) 2014-11-24 2016-10-17 Vetco Gray Scandinavia As Fremgangsmåte og system for regulering av fluid
US10260489B2 (en) * 2015-05-14 2019-04-16 Petrospec Engineering Inc. Method of supplying fluid to a submersible pump
ITUB20152842A1 (it) * 2015-08-04 2017-02-04 Nuovo Pignone Tecnologie Srl Sistema di pompaggio dotato di circuito di somministrazione di fluido barriera per le tenute a secco.
NO341127B1 (en) 2015-10-15 2017-08-28 Aker Solutions As Subsea barrier fluid system
US10550949B2 (en) 2016-08-23 2020-02-04 Onesubsea Ip Uk Limited Barrier fluid pressure system and method
CN108252964A (zh) * 2018-01-23 2018-07-06 威乐(中国)水泵系统有限公司 一种机械密封冲洗系统

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Publication number Priority date Publication date Assignee Title
US2332150A (en) 1942-07-13 1943-10-19 Universal Oil Prod Co Seal for pumps, mixers, and the like
GB1124776A (en) 1965-07-06 1968-08-21 Borg Warner Mechanical seal construction
US4078809A (en) * 1977-01-17 1978-03-14 Carrier Corporation Shaft seal assembly for a rotary machine
DE3347263C2 (de) 1983-12-28 1995-07-13 Friatec Rheinhuette Gmbh & Co Verfahren und Vorrichtung zum Abdichten einer Pumpenwelle
US5375853B1 (en) * 1992-09-18 1998-05-05 Crane John Inc Gas lubricated barrier seal
US5746435A (en) * 1994-09-30 1998-05-05 Arbuckle; Donald P. Dual seal barrier fluid leakage control method
US5769427A (en) 1995-09-13 1998-06-23 Chesterton International Company Dual seal with clean barrier fluid and dynamic pressure control
JP2000170680A (ja) * 1998-09-30 2000-06-20 Aisin Seiki Co Ltd 真空ポンプ

Also Published As

Publication number Publication date
EP2156056A1 (de) 2010-02-24
US20120027564A1 (en) 2012-02-02
WO2008138730A1 (de) 2008-11-20
ATE513134T1 (de) 2011-07-15
BRPI0811580A2 (pt) 2015-08-04
BRPI0811580B1 (pt) 2019-10-01
US9303654B2 (en) 2016-04-05

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