US20180223857A1 - Pumping system with barrier fluid delivery circuit for dry gas seals - Google Patents

Pumping system with barrier fluid delivery circuit for dry gas seals Download PDF

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Publication number
US20180223857A1
US20180223857A1 US15/750,024 US201615750024A US2018223857A1 US 20180223857 A1 US20180223857 A1 US 20180223857A1 US 201615750024 A US201615750024 A US 201615750024A US 2018223857 A1 US2018223857 A1 US 2018223857A1
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US
United States
Prior art keywords
pump
shared
pumping system
barrier fluid
pumps
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.)
Abandoned
Application number
US15/750,024
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English (en)
Inventor
Fabrizio MILONE
Alberto GRIMALDI
Giuseppe VERONICO
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.)
Nuovo Pignone Technologie SRL
Original Assignee
Nuovo Pignone Technologie SRL
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 Nuovo Pignone Technologie SRL filed Critical Nuovo Pignone Technologie SRL
Publication of US20180223857A1 publication Critical patent/US20180223857A1/en
Abandoned 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
    • F04D29/08—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
    • 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
    • F04D29/102—Shaft sealings especially adapted for elastic fluid 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
    • F04D13/00—Pumping installations or systems
    • F04D13/12—Combinations of two or more pumps
    • F04D13/14—Combinations of two or more pumps the pumps being all of centrifugal type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D23/00—Other rotary non-positive-displacement pumps
    • F04D23/001—Pumps adapted for conveying materials or for handling specific elastic fluids
    • F04D23/003—Pumps adapted for conveying materials or for handling specific elastic fluids of radial-flow type
    • 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

Definitions

  • the present disclosure relates to a fluid pumping system, particularly but not exclusively for pumping carbon dioxide (CO2), comprising a plurality of pumps and a dry gas seals protecting apparatus for protecting the integrity of dry gas seals of said pumps, in an embodiment centrifugal pumps, during standby conditions.
  • CO2 carbon dioxide
  • the present disclosure relates to a pumping system which allows to protect the integrity of the dry gas seals of a centrifugal pump during standby conditions of said pump for CO 2 applications, e.g. the re-injection, transportation and sequestration of pure CO 2 and CO 2 +hydrocarbons in oil and gas recovery plants.
  • the gas pressure inside the pump is higher than the external, atmospheric, pressure. Downstream of the primary seal there is a pressure established by a buffer fluid, typically nitrogen or air available at a pressure of four to six bar. Further, the higher pressure and un-treated process gas permeates the primary dry gas seal, transporting particulate and liquid contamination.
  • a buffer fluid typically nitrogen or air available at a pressure of four to six bar.
  • FIGS. 1 to 3 a known configuration comprising a single centrifugal pump utilizing a dry gas seal is shown.
  • FIG. 1 discloses a detailed diagram of a related art configuration of a dry gas seal (DGS) system 100 for a carbon dioxide (CO2) pump. It should be noted in this configuration that any fluid in a supercritical state can be used as a barrier fluid in place of the exemplary carbon dioxide (CO2).
  • DGS dry gas seal
  • CO2 carbon dioxide
  • FIG. 1 reflects the behavior of the dry gas seal during operating conditions and includes a CO2 pump 102 with its associated area to be sealed, a primary (inboard) seal 104 of a dry gas seal, a secondary (outboard) seal 106 of the dry gas seal, a process fluid filter 108 , a process fluid heater 110 , a valve and control element 120 for controlling the flow to a flare-safe area, an intermediate buffer gas filter 114 , intermediate buffer gas 116 , barrier fluid 118 , pressure reduction valve 120 , a primary dry gas seal chamber 122 and a secondary dry gas seal chamber 124 .
  • a process fluid e.g. carbon dioxide
  • the pressure of the barrier fluid is reduced by a valve 120 and heated by a heater 110 .
  • the barrier fluid is then filtered by filters 108 and injected into the primary dry gas seal chamber 122 .
  • the pressure of the barrier fluid is higher than the suction pressure of the pump and therefore it prevents the entry of any untreated process gas into the primary seal 104 .
  • the barrier fluid (carbon dioxide) flows partly into the pump through the inner labyrinth and partly to the primary vent through the primary dry gas seal.
  • the carbon dioxide (CO2) that flows into the pump reaches a suction pressure that is higher than the critical pressure for carbon dioxide (CO2) and accordingly no problems of icing will occur.
  • the carbon dioxide (CO2) that flows through the primary seal to the primary vent expands from P 1 to a value established by the buffer gas (typically N2/air at 4-6 bar).
  • the temperature of the carbon dioxide (CO2) barrier fluid should be maintained, by a heater, to a value high enough to avoid, during the expansion, the risk of icing.
  • An intermediate buffer gas 116 e.g. nitrogen or dry air is filtered by filters 114 and injected into the secondary dry gas seal chamber 124 . It should be noted in the known configuration that other gases than nitrogen or air can also be used as a buffer gas.
  • the pressure of the intermediate buffer gas 116 is higher than the pressure of the barrier gas passing through the primary seal 104 and prevents the barrier gas from reaching the secondary seal 106 .
  • the mixture of barrier gas 118 and intermediate buffer gas 116 in the secondary dry gas seal chamber 124 passes through a valve 112 and flows to a flare-safe area.
  • FIG. 2 shows the same diagram of FIG. 1 when the pump is in a standby condition. In this condition the discharge pressure from the pump is equal to the pressure in the area to be sealed 102 . When the pump is in a standby condition, the pressure into the pump reaches a uniform value very close to the suction pressure.
  • the result of the standby condition is the process fluid from the pump discharge can no longer act as a barrier fluid to prevent the flow of untreated process fluid, from the area to be sealed 102 , into the primary seal 104 . Furthermore, the untreated process fluid is not heated or filtered and therefore contaminates can enter the primary seal 104 and icing can occur in the primary seal 104 .
  • CO2 carbon dioxide
  • the reference is to FIG. 3 in order to avoid risks of damages and icing when the pump is in standby condition additional boosters, not shown in the drawing, are provided for the barrier fluid 118 to maintain the barrier gas at the conditions provided during running condition of the pump.
  • This solution requires the similar treatment of the process fluid with respect to filtering and heating to prevent contamination of the dry gas seal.
  • Plants for carbon dioxide (CO 2 ) applications e.g. the re-injection, transportation and sequestration of pure carbon dioxide and carbon dioxide+hydrocarbons in oil and gas recovery plants, are here considered.
  • At least one centrifugal pump is provided, in an embodiment at least two centrifugal pumps working alternatively are provided, so that when a first pump is in an operative/running condition the second pump is in a standby condition.
  • Switching between the pumps allows reduction in the maintenance costs due to replacing the barrier fluid and increase in the MTBF (Mean Time Between Failures).
  • each pump may work for less time, lengthening the expected time between a fault and the other (MTBF).
  • centrifugal pumps avoids the plant shutdown, being able to operate a second pump when it is necessary to perform maintenance on a first pump.
  • the object of the present disclosure is to provide a pumping system suitable to achieve, among others, the advantages listed above.
  • FIG. 1 is a schematic view of a dry gas seal and the associated gas support system when the pump is in an operating/running condition
  • FIG. 2 is a schematic view of a dry gas seal and the associated gas support system when the pump is in a dangerous standby condition (risk of damages and icing);
  • FIG. 3 is a schematic view of a dry gas seal and the associated gas support system when the pump is in a safe standby condition (no risk of damages and icing);
  • FIG. 4 is a schematic view of the pumping system according to the present disclosure.
  • FIG. 5 represents a flowchart of the steps of the method according to the present disclosure.
  • the present disclosure relates the oil and gas recovery plants, i.e. on off-shore oil and gas implants. More in details, the present disclosure concerns industrial plants for carbon dioxide (CO2) applications.
  • CO2 carbon dioxide
  • At least one centrifugal pump is provided, in an embodiment at least two centrifugal pumps working alternatively are provided, so that when a first pump is in an operative/running condition the second pump is in a standby condition.
  • Switching between the pumps allows reduction in the maintenance costs due to replacing the barrier fluid and increase in the MTBF (Mean Time Between Failures).
  • each pump may work for less time, lengthening the expected time between a fault and the other (MTBF).
  • centrifugal pumps avoids the plant shutdown, being able to operate a second pump when it is necessary to perform maintenance on a first pump.
  • the object of the present disclosure is to provide a pumping system suitable to achieve, among others, the advantages listed above.
  • the pumping system 200 comprises at least a first pump 300 and a second pump 400 , in an embodiment the first and the second pump are centrifugal pumps, at least one dry gas seal being associated to each of the first and second pump.
  • the pumping system 200 comprises a process shared fluid delivery circuit 150 in turn comprising a first barrier fluid delivery circuit 301 which fluidly connects the pump discharge 330 of the first pump 300 to at least one dry gas seal of the second pump 400 to deliver a barrier fluid to said at least one dry gas seal of the second pump 400 .
  • the shared process fluid delivery circuit 150 comprises a second barrier fluid delivery circuit 401 which fluidly connects the pump discharge 430 of the second pump 400 to at least one dry gas seal of the first pump 300 to deliver a barrier fluid to said at least one dry gas seal of said first pump.
  • the first 301 and second 401 barrier fluid delivery circuits of said shared delivery circuit 150 merge in a shared branch line 500 on which a reduction valve 512 suitable to reduce the pressure of the barrier fluid coming from the pump discharges 330 , 430 , a filter 514 and a heater 513 are provided.
  • a shared header 515 is further provided on said shared branch 500 downstream to said heater 513 with respect to the flow direction.
  • the shared branch 500 splits into two return branch lines: a first return branch line 517 which fluidly connects said shared header 515 to the dry gas seals of the first pump 300 , said first return line 517 in turn comprising a first 517 a and a second 517 b barrier fluid delivery sections, each of said sections of said first return line 517 being fluidly connected to one of said dry gas seals of the first pump 300 , and a second return branch line 518 which fluidly connects said shared header 515 to the dry gas seals of the second pump 400 , said second return branch line 518 in turn comprising a first 518 a and a second 518 b barrier fluid delivery sections, each of said first 518 a and second sections 518 b of said second return line 518 being fluidly connected to one of the dry gas seals of the second pump 400 .
  • the process fluid e.g. carbon dioxide (CO2)
  • CO2 carbon dioxide
  • the process fluid coming to the shared header 515 from the second pump discharge 430 of the second pump 400 is used as a barrier fluid for the dry gas seals of the first pump 300 when, in an operative condition, said second pump 400 is in a running condition and said first pump 300 is in a standby condition.
  • the pressure of the barrier fluid is reduced by the reduction valve 512 and filtered by the filter 514 and then heated by the heater 513 .
  • the barrier fluid is then injected into the dry gas seal chamber of the pump in the standby condition.
  • the process fluid is bled from the discharge 330 of the first pump 300 through the first barrier fluid delivery circuit 301 and enters the shared branch line 500 .
  • the pressure of the process fluid is then reduced in the shared branch 500 by the reduction valve 512 , and then the fluid is filtered by the filter 514 and heated by the shared heater 513 .
  • the process fluid ready to be used as barrier fluid for the gas seals, then flows into the shared header 515 where all the fluctuations, due to discontinuous operations, are smoothed and the fluid properties are stabilized. In this way the most fragile components of the dry gas seals, that are the sealing faces, are protected from abrupt pressure changes.
  • the process fluid flows through the second return branch line 518 to the dry gas seals of the second pump 400 , which is in a standby condition.
  • a first check valve 302 is provided on said first barrier fluid delivery duct 301
  • a second check valve 402 is provided on said second barrier fluid delivery duct 401 .
  • the pumping system 200 is therefore adapt to feed a flow of fluid, for example carbon dioxide (CO2), from the pump discharge of a first running pump 300 and to flush the dry gas seal or seals of the second pump 400 when said second pump is in standby condition.
  • a flow of fluid for example carbon dioxide (CO2)
  • the pumping system 200 is apt to feed a flow of process fluid from the pump discharge of the second pump 400 ant to flush the dry gas seal or seals of the first pump 300 .
  • the pumping system according to the present disclosure it is not necessary to provide highly reliable, and therefore also highly expensive, auxiliary booster compressors to provide barrier fluid to the dry gas seals of the pump which is in a standby condition the whole time the pump is in a standby condition.
  • the pumping system comprises only two pumps and both of them are in a standby condition at the same time, it may be enough to provide the system with simpler and cheaper boosters.
  • said booster compressors will be switched on only in the rare case and for the short period of time in which all the pumps of the pumping system are simultaneously in a standby condition.
  • the pumping system according to the present disclosure allows installing more economical booster compressors and, because said booster compressors are rarely switched on, the system is very reliable and energy efficient.
  • the pumping system 200 allows switching of the pump function from a running condition to a standby condition.
  • the pump discharge 330 supplies the barrier fluid through the first barrier fluid delivery circuit 301 to the shared header 515 and, finally, to the dry gas seals of the second pump 400 , which is in standby condition.
  • the first pump 300 When it is required by the circumstances, for example when maintenance operations are necessary on the first pump, or when it ma advantageous to operate the two pumps alternatively for shorter periods, e.g. to increase the MTBF of the pumps, the first pump 300 is turned in a standby condition, while the second pump 400 is turned in an operative condition.
  • the pumping system according to the present disclosure is highly versatile with respect to the possibility to switch the operative conditions of the two pumps, so that the end user has a high number of possibilities to operate the pumps in the best way in view of the circumstances and of the results to be achieved. Thanks to the second barrier fluid delivery circuit 401 , the second pump 400 , which now is the running pump supplies the barrier fluid through the second barrier fluid delivery circuit 401 to the first pump, which is in standby condition.
  • the pumping system may comprise more than two pumps, e.g. three or four pumps. In these possible configurations, the pumping system will comprise a corresponding number of barrier fluid delivery circuits.
  • the pumping system 200 may comprise a control unit configured to switch the operative conditions of the pumps and to control the operative conditions of the devices provided on the barrier fluid delivery circuits.
  • the pumping system according to the present disclosure achieves the results consisting of reduction of maintainability costs, increase of MTBF and cost reduction of booster compressors, which are no longer necessary.
  • the present disclosure also concerns a method for providing a barrier fluid to a dry seal of a pump.
  • the method according to the present disclosure allows to provide barrier fluid to a dry seal of a pump when said pump is in a standby condition and without the need to provide additional boosters.
  • a first running pump is fluidly connected, by means of a shared process fluid circuit, to said standby pump.
  • the method comprises at least the following steps, disclosed in the flowchart of FIG. 5 .
  • a first step 1 consisting of receiving a barrier fluid from a discharge port of a first pump into a shared process fluid recovery circuit coupled with the discharge port.
  • a second step 2 consisting of reducing pressure of the barrier fluid
  • a third step 3 consisting of directing the reduced pressure barrier fluid to a dry seal of a second pump coupled with the shared process fluid recovery circuit.
  • the method here above described further comprises a further step 2 a consisting of filtering and warming the barrier fluid in said shared process fluid recovery circuit after reducing its pressure and before directing the reduced pressure barrier fluid to the dry seal of the second pump.
  • the barrier fluid coming from the running condition pump is provided to the dry seal of the standby pump.
  • the functioning conditions of the two pumps can be switched so that the first pump is switched to a standby condition and the second pump is switched to a running condition. Thanks to the shared process fluid recovery circuit, the barrier fluid coming from the second pump, now in a running condition, is provided to the dry seal of the first pump, now in standby condition.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Massaging Devices (AREA)
US15/750,024 2015-08-04 2016-08-02 Pumping system with barrier fluid delivery circuit for dry gas seals Abandoned US20180223857A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT102015000041608 2015-08-04
ITUB2015A002842A ITUB20152842A1 (it) 2015-08-04 2015-08-04 Sistema di pompaggio dotato di circuito di somministrazione di fluido barriera per le tenute a secco.
PCT/EP2016/068407 WO2017021399A1 (en) 2015-08-04 2016-08-02 Pumping system with barrier fluid delivery circuit for dry gas seals

Publications (1)

Publication Number Publication Date
US20180223857A1 true US20180223857A1 (en) 2018-08-09

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US15/750,024 Abandoned US20180223857A1 (en) 2015-08-04 2016-08-02 Pumping system with barrier fluid delivery circuit for dry gas seals

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US (1) US20180223857A1 (ja)
EP (1) EP3332128B1 (ja)
JP (1) JP6850789B2 (ja)
CN (1) CN108138784B (ja)
ES (1) ES2788157T3 (ja)
IT (1) ITUB20152842A1 (ja)
WO (1) WO2017021399A1 (ja)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN112681447A (zh) * 2021-01-06 2021-04-20 三门核电有限公司 一种核电站厂用水泵轴封水供给系统

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Publication number Priority date Publication date Assignee Title
CN113446256B (zh) * 2017-08-29 2023-02-28 株式会社荏原制作所 密封系统
JPWO2023026493A1 (ja) * 2021-08-27 2023-03-02
CN114483590B (zh) * 2022-01-28 2023-04-11 浙江水泵总厂有限公司 机封冲洗结构及具有其的真空密闭管路系统

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GB1040416A (en) * 1962-06-01 1966-08-24 Borg Warner Mechanical seal and cyclone
US3498620A (en) * 1968-01-22 1970-03-03 Borg Warner Mechanical seal lubrication means
US3554661A (en) * 1968-12-20 1971-01-12 Decatur Pump Co High temperature pump
US3999882A (en) * 1975-03-17 1976-12-28 Dresser Industries, Inc. Flushing and cooling system for shaft seals and pumps
US4311004A (en) * 1979-10-26 1982-01-19 Rotoflow Corporation Gas compression system and method
DE3337839A1 (de) * 1982-11-01 1984-05-03 Borg-Warner Corp., Chicago, Ill. Pumpenanordnung
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Publication number Priority date Publication date Assignee Title
CN112681447A (zh) * 2021-01-06 2021-04-20 三门核电有限公司 一种核电站厂用水泵轴封水供给系统

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CN108138784B (zh) 2020-02-14
EP3332128A1 (en) 2018-06-13
JP2018522162A (ja) 2018-08-09
WO2017021399A1 (en) 2017-02-09
ES2788157T3 (es) 2020-10-20
CN108138784A (zh) 2018-06-08
EP3332128B1 (en) 2020-02-26
ITUB20152842A1 (it) 2017-02-04
JP6850789B2 (ja) 2021-03-31

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