EP2060788A1 - Procédé de commande d'un agencement de pompe et agencement de pompe - Google Patents

Procédé de commande d'un agencement de pompe et agencement de pompe Download PDF

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Publication number
EP2060788A1
EP2060788A1 EP07120867A EP07120867A EP2060788A1 EP 2060788 A1 EP2060788 A1 EP 2060788A1 EP 07120867 A EP07120867 A EP 07120867A EP 07120867 A EP07120867 A EP 07120867A EP 2060788 A1 EP2060788 A1 EP 2060788A1
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EP
European Patent Office
Prior art keywords
pump
volume flow
bypass valve
speed
cavitation
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.)
Granted
Application number
EP07120867A
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German (de)
English (en)
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EP2060788B1 (fr
Inventor
Sebastian Haas
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.)
Linde GmbH
Original Assignee
Linde GmbH
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Filing date
Publication date
Application filed by Linde GmbH filed Critical Linde GmbH
Priority to EP07120867A priority Critical patent/EP2060788B1/fr
Priority to DE502007003785T priority patent/DE502007003785D1/de
Priority to AT07120867T priority patent/ATE467763T1/de
Priority to US12/263,343 priority patent/US20090129941A1/en
Publication of EP2060788A1 publication Critical patent/EP2060788A1/fr
Application granted granted Critical
Publication of EP2060788B1 publication Critical patent/EP2060788B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
    • F25J3/04951—Arrangements of multiple air fractionation units or multiple equipments fulfilling the same process step, e.g. multiple trains in a network
    • F25J3/04963—Arrangements of multiple air fractionation units or multiple equipments fulfilling the same process step, e.g. multiple trains in a network and inter-connecting equipment within or downstream of the fractionation unit(s)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/06—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure
    • F04B15/08—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure the liquids having low boiling points
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/04084—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/0409—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/04096—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of argon or argon enriched stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04781—Pressure changing devices, e.g. for compression, expansion, liquid pumping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04787—Heat exchange, e.g. main heat exchange line; Subcooler, external reboiler-condenser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04812—Different modes, i.e. "runs" of operation
    • F25J3/04818—Start-up of the process
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04812—Different modes, i.e. "runs" of operation
    • F25J3/04824—Stopping of the process, e.g. defrosting or deriming; Back-up procedures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0209—Rotational speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/05—Pressure after the pump outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/22—Compressor driver arrangement, e.g. power supply by motor, gas or steam turbine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
    • F25J2235/02—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams using a pump in general or hydrostatic pressure increase
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/02—Recycle of a stream in general, e.g. a by-pass stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/10—Mathematical formulae, modeling, plot or curves; Design methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/62—Details of storing a fluid in a tank

Definitions

  • the present invention relates to a method for driving a pump assembly, as used for example in cryogenic plants.
  • the invention further relates to an arrangement with one or more pumps for providing pressurized cryogenic liquid, wherein the arrangement is suitable, for example, for use in an air liquefaction plant.
  • the control and regulation of pump drives to predetermined target values, such as a desired output pressure, depending on various measurable variables, such as a differential pressure between the inlet side and outlet side of a pump, volume or mass flows, speed of the pump drive or the like especially necessary for large-scale fluid processing plants.
  • a pump drives while asynchronous motors, which are operated with three-phase current, spread.
  • cryogenic pumps ie pumps that operate cryogenic liquids at temperatures of less than -170 ° C, with corresponding three-phase asynchronous machines.
  • a cryogenic liquid or liquefied air is brought to a predetermined operating pressure by cryogenic pumps and then supplied, for example, to other equipment such as a heat exchanger.
  • redundant pumps are used in parallel to still maintain the necessary pressure in the cryogenic system in case of failure of one of the pumps.
  • redundant Pump pairs are provided in which a working pump is constantly in use and in case of failure, a replacement pump starts and replaces the failed pump performance.
  • so-called slow-roll operating modes are known in which the drive motor is indeed active, but the pump performs only a minimal promotion work.
  • the pressure in the high pressure region of the corresponding system does not drop too much, it is necessary to bring the redundant equivalent pump as quickly as possible in an operating condition that corresponds to the original operating state of the operating pump. That As a rule, the speed of the replacement pump must reach the speed of the failed operating pump as quickly as possible.
  • the speed of the respective pump which performs delivery work, determined by operating specifications of the respective system and is set in a control loop.
  • the speed of an asynchronous motor is essentially predetermined by the three-phase frequency with which it is operated. In conventional controls, therefore, a frequency converter is used which provides the three-phase frequency for the motor driving the pump.
  • a corresponding control device sets the three-phase current frequency for the pump or asynchronous motors as a function of the pressure of the product present on the pump outlet side.
  • a method for driving a pump assembly having a fluid delivery pump having a pump drive with a bypass line having a bypass valve.
  • the bypass line serves to return fluid into an inlet-side reservoir.
  • the bypass valve is controlled such that the volume flow through the pump is at a respective delivery between a Kavitationsvolumenstrom and increased by a predetermined maximum volume flow deviation Kavitationsvolumenstrom.
  • a control line for the operating point of the pump can be set, which runs as close as possible to a cavitation boundary line, whereby a favorable reduction of the volume flow occurs without cavitation can occur.
  • the proposed control of the bypass valve results in that the volume flow is at least partially reduced during the startup process and is located near a lower cavitation boundary line.
  • the bypass valve is further controlled such that the volume flow at a respective delivery height is in a volume flow range which is between a lower limit volume flow and the increased by the predetermined maximum volume flow deviation Kavitationsvolumenstrom.
  • a control line for the volumetric flow can be defined, which runs essentially parallel to the lower cavitation boundary line.
  • the lower limit volumetric flow then lies, for example, between the control line and the cavitation boundary line, and an upper limit volumetric flow runs in a corresponding delivery height / volumetric flow diagram to the right of the control line.
  • the range is determined in such a way that, even with overshoots in regulation, the cavitation volume flow is never exceeded.
  • an implementation of the method as a cavitation limit regulator is possible, which controls the bypass valve from the difference between an inlet pressure and an outlet pressure of the pump and the current volume flow.
  • the method according to the invention can advantageously be exploited that is moved in the startup process of the pump drive substantially along a cavitation boundary line. This ensures a particularly low volume flow.
  • a current volume flow in dependence on a pressure difference between an inlet side and an outlet side of the pump and / or the current speed of the pump drive is determined.
  • a reserve pump in slow-roll or standby mode usually has an open bypass. Based on this state, the volume flow is then minimized in order to bring the respective replacement pump as fast as possible to the predetermined speed.
  • a higher-level pressure regulator supplies, for example, a speed for the pump depending on the requested product in the outlet line. It is also conceivable to use a plurality of pumps in parallel, which operate a common high pressure fluid line. A corresponding pressure regulator then supplies a target speed for these pumps.
  • Reducing the flow of the bypass valve to increase the head of the pump and reducing the flow at a given maximum change in the speed of the pump drive during a first start-up phase For example, a maximum speed change of 10%, preferably 5%, may be desired during the first start-up phase.
  • the bypass valve should be closed so fast that the speed does not increase significantly. For example, with a total ride time of the respective pump of, for example, 10 seconds, closure may occur within one second.
  • an operating point of the pump substantially along a delivery height-volume flow characteristic of the pump at operated constant speed.
  • the bypass valve can be rambled, so be changed in a given period of time by a predetermined opening. It is also possible to set a desired value for the regulator acting on the bypass valve with a corresponding time profile for the valve position in this first startup phase.
  • the bypass valve is regulated to increase the rotational speed of the pump drive in such a way that the volume flow is greater than the cavitation volume flow when the delivery head increases.
  • the cavitation volume flow corresponds to a minimum necessary volume flow to avoid cavitation at a respective delivery height.
  • the pump is operated at an operating point in the second start-up phase substantially parallel to a cavitation boundary line of a delivery height-volume flow characteristic field of the pump.
  • Closing the bypass valve on reaching a predetermined head or a predetermined discharge pressure in a third start-up phase For example, as soon as the pressure required by a pressure regulator is reached on the outlet side, the volume flow can also be increased again, which is achieved by closing the bypass valve. In principle, this can be done until a pressure regulator acting on the bypass valve detects a maximum pressure. Then the bypass valve would have to be opened.
  • a closing of the bypass valve may also be necessary in other operating situations. For example, if fluid is withdrawn on the exit side, the control may cause the bypass valve opening to be reduced.
  • the method is particularly suitable for use in an asynchronous motor as a pump drive with a three-phase frequency, which corresponds to the predetermined target speed. Approximately, the current speed can also be approximated by the synchronous speed. The resulting slip can be neglected.
  • a pump arrangement with at least one pump, a reservoir and a control device is provided.
  • the pump has a pump drive, and the reservoir is connected to the pump outlet side via a bypass line to the pump.
  • the bypass line has a bypass valve.
  • the reservoir provides fluid to be pumped on the pump inlet side.
  • the control device is set up in such a way that a method described above is carried out.
  • the pump arrangement can have a cavitation limit regulation device which controls the bypass valve as a function of a current volume flow through the pump and a current rotational speed of the pump drive of the pump.
  • a control can also take place as a function of the differential pressure between the input and output side, the current speed and / or the delivery head.
  • the cavitation limit control device is provided, since otherwise, in particular in the case of cryogenic fluids, damage can occur due to cavitation.
  • a pressure regulator which detects the outlet pressure can be provided which controls the bypass valve such that a predetermined maximum outlet pressure is not exceeded. However, control by the cavitation limit controller should be prioritized.
  • One or more corresponding pump arrangements are particularly suitable for use in air separation plants with cryogenic pumps.
  • the control device can also specify the target speed of the respective cryogenic pump as a function of operating specifications for a method for air separation.
  • a computer program product which causes the implementation of a corresponding method for driving a pump drive on a program-controlled computer or control device.
  • a program-controlled computer or control device is for example a PC or a computer of a control room for the control and regulation of equipment in question, is installed on the appropriate software.
  • the computer program product may, for example, be implemented in the manner of a data carrier, such as a USB stick, floppy disk, CD-ROM, DVD, or else be implemented on a server device as a downloadable program file.
  • ASU corresponding air separation unit
  • the corresponding cryogenic liquid is then evaporated therein.
  • redundant pumps are provided which start as a replacement pump in the event of the failure of the actual operating pump. It is also conceivable that a plurality of individual plant parts are supplied with cryogenic liquid under pressure from a common reservoir or tank. This is for example in the FIG. 1 shown schematically.
  • a common high-pressure liquid line 1 which is supplied by three pumps 2, 3, 4 with high-pressure liquid.
  • the pumps receive the respective product via a supply line 5 from a common reservoir or tank 6.
  • a bypass return 7, 8, 9 is provided, each with a pressure-controlled valve 10, 11, 12.
  • Each pump 2, 3, 4 is also secured via a check valve 13, 14, 15 with respect to the common high-pressure liquid line 1.
  • the common high pressure liquid line 1 To the common high pressure liquid line 1 are in the example of FIG. 1 three plant parts coupled. For example, two heat exchangers 16, 17 of air separation plants and a back-up system 18 are coupled to the common high-pressure liquid line 1. On the gas side, the product pressure is controlled via pressure-controlled valves 19, 20. The respective required amount of product is also controlled by valves 21, 22. Similarly, removal of high-pressure liquid from the common line 1 takes place through the back-up system 18 via a valve 24 controlled by a regulator 23.
  • the required pressure by controlling the pumps 2, 3, 4 is regulated in the common high-pressure line 1.
  • the pump bypasses 8, 9 are closed, and for the pumps or the asynchronous motors used therein, a suitable three-phase frequency is predetermined.
  • the replacement pump 2 then operates, for example, in a slow-roll mode, and the associated bypass valve is 100% open.
  • the number of reproached pumps 2, 3, 4 corresponds to the number of units 16, 17 taken from the common high-pressure line 1. If the use of the back-up system is necessary, the third pump must also be started up.
  • the controller or the control device 25 outputs to the pumps a predetermined three-phase current frequency nsyn as a function of the operating specifications of the other connected system components.
  • FIG. 2 is a schematic representation of a pump assembly shown in the cutout, as shown for example in the FIG. 1 for the pumps 2, 3, 4 can be executed.
  • the pump 2 is driven by a motor 26, wherein the respective rotational speed is controlled by a control device 27 via a control signal CT3.
  • the motor 26 In principle, depending on the current speed nakt and the desired speed nz of the motor 26 are preferably moved into an operating range in which its torque is in principle a maximum. In the starting phase, that is to say when the drive 26 of a replacement pump 2 is connected, this can be achieved, for example, by operating the drive 26 designed as an asynchronous motor in the vicinity of its tilting point.
  • a cavitation limit control is provided with a Kavitationsgrenzregel worn 30, which supplies a control signal CT1 to the control device or interrogator 32, which operates the bypass valve.
  • a pressure meter 29 is provided on the pump inlet side, which measures the inlet pressure p I and supplies the cavitation boundary control device 30.
  • a pressure regulator 31 is provided on the outlet side, which supplies on the one hand the outlet pressure p O to the cavitation limit controller 30 and on the other hand transmits a control signal CT2 to the control device 32 in order to open the bypass valve 10 when a maximum permissible outlet pressure is exceeded.
  • the various control mechanisms such as cavitation limit regulation and pressure regulator 31 for the bypass valve 10 can in principle be carried out independently of one another, but the cavitation limit controller 30 supplies a control signal CT1 prioritized over the control signal CT2. It is possible, for example, the controller 32 always makes a maximum selection between the values of the control signal CT1 from the cavitation limit controller 30 and the control signal CT2 from the pressure regulator 31. This ensures that no cavitation occurs, and yet both the output pressure is reliably controlled.
  • the controller 31 shown as a pressure regulator (PIC) can also be designed as a hand controller (HIC) in other embodiments of a corresponding pump arrangement.
  • PIC pressure regulator
  • HIC hand controller
  • the delivered by the pump flow rate P Q results from the flow rate V ⁇ and the specific delivery work Y, which represents the impressed into the flow work.
  • p stands for the density of the fluid, g for the gravitational acceleration and H for the head, which can be deduced from the specific production work.
  • the corresponding sizes are, as in the FIG. 2 is shown accessible via corresponding sensors or controllers.
  • the applied by the pump hydraulic power P Q results from the mechanical power P M multiplied by the efficiency ⁇ .
  • FIG. 3 represents a possible course of the operating point of a ramp-up pump according to a variant of the method for starting up a pump drive 26 on the basis of a delivery height-volume flow diagram.
  • FIG. 3 shows the corresponding characteristics n1, n2, n3, n4, n5 in the delivery height-volume flow diagram, where n1-n5 are for different speeds of the pump drive 26.
  • the volume flow V ⁇ is indicated on the X axis and the delivery height H on the Y axis.
  • the delivery head H is generally proportional to n 2 , if a constant efficiency ⁇ can be assumed.
  • n1 may correspond to 45% -50% of the maximum desired speed n5 as a possible slow-roll speed.
  • two cavitation boundary lines KG1 and KG2 are shown.
  • the resulting braking torque can be determined by the FIG. 3 by the rectangular area defined at a given operating point, for example BP1, by the operating point and the origin of the diagram.
  • the current volume flow V ⁇ can be determined from a diagram of the pump manufacturer about the speed n and the differential pressure ⁇ p be determined. Since these quantities are the Kavitationsgrenzregler 30, as in the FIG. 2 is shown, this can prevent falling below the cavitation boundary line KG1 by opening the bypass valve 10. In normal operation, when sufficient product is withdrawn from the liquid line 1, the bypass valve is usually completely closed, the cavitation limit controller 30 then indicates 0% opening via the control signal CT1.
  • a first start-up phase which in the FIG. 3 is indicated by dashed arrow P1
  • the bypass valve 10 is controlled so that the speed fluctuates only by a small value .DELTA.n, starting from the current speed n1 and from BP1 an operating point BP2 is reached, one by the minimum necessary Volume flow of the cavitation boundary line KG1 (cavitation volume flow) increased volume flow at the predetermined head has.
  • the speed nakt should not fluctuate more than 10%, preferably 5%. It is ensured a distance according to a control line of the Kavitationsvolumenstrom. The distance results in such a way that even extraordinary fluctuations in the operation of the pump can not cause a volume flow below the cavitation boundary line.
  • bypass valve position 10 is regulated in such a way that an operating point BP3 is reached which has a higher volume flow and has a higher head H than the operating point BP2.
  • a control of the bypass valve takes place such that the operating point runs parallel to the cavitation boundary line KG1.
  • a distance in the volume flow of the Kavitationsgrenzline KG1 is maintained.
  • the corresponding control parameters for controlling the pump according to the second startup phase P2 can be determined and optimized, for example, in dynamic simulations or experimentally.
  • a control line RL is shown, which runs parallel to the upper cavitation boundary line KG1 at a distance ⁇ V ⁇ -dV ⁇ , where ⁇ V ⁇ > dV ⁇ .
  • an area VB is defined around the control line RL which the operating point should not leave during the second startup phase P2.
  • a lower limit volume flow is then given by RL - dV ⁇ and an upper limit volume flow by RL + dV ⁇ .
  • the control line RL preferably corresponds to a volume flow V, which is 2% -10% above the respective Kavitationsvolumenstrom. dV ⁇ depends on the control parameters, the control accuracy and the actual implementation of the system. It should be ensured as close as possible to the right of the cavitation line for the operating point.
  • a third start-up phase P3 the discharge pressure of the pump has risen sufficiently, so that fluid is conveyed into the product network or the delivery line 1.
  • the volume flow V now increases more and the bypass valve is closed. This is done, for example, by the pressure regulator 31 which is set to set point high (SPH).
  • SPH set point high
  • the operating point BP4 is reached.
  • the operating point BP4 is at a delivery height or corresponds to an outlet pressure which corresponds to the desired value of the pressure regulator 25 acting on the pump rotational speed. This is indicated by the dashed line PIC25.
  • the another horizontal, dashed curve PIC31 in the delivery height-volume flow diagram of FIG. 3 corresponds to the set value of the pressure regulator 31 acting on the bypass valve.
  • the invention thus provides a method which can be implemented in the corresponding control or control center computers of plants, and minimizes the run-up time of a pump drive, in particular of cryogenic internal compression centrifugal pumps allows.
  • the process can be used on single pumps as well as on redundant replacement pumps with several pumps operating at the same time and reduces pressure and product volume fluctuations on the output side.
  • the process can also be easily integrated into existing control concepts and is independent of the number of pumps used and operated.
  • a corresponding analog cavitation limit control for the upper cavitation boundary KG2 also prevents possible damage by cavitation on the respective pump impeller in large-sized bypass valves, for example, if a replacement pump runs in slow-roll mode.
  • an area just below the upper cavitation volume flow KG2 can be determined, in which an operating point is to run.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
EP07120867A 2007-11-16 2007-11-16 Procédé de commande d'un agencement de pompe et agencement de pompe Not-in-force EP2060788B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP07120867A EP2060788B1 (fr) 2007-11-16 2007-11-16 Procédé de commande d'un agencement de pompe et agencement de pompe
DE502007003785T DE502007003785D1 (de) 2007-11-16 2007-11-16 Verfahren zum Ansteuern einer Pumpenanordnung und Pumpenanordnung
AT07120867T ATE467763T1 (de) 2007-11-16 2007-11-16 Verfahren zum ansteuern einer pumpenanordnung und pumpenanordnung
US12/263,343 US20090129941A1 (en) 2007-11-16 2008-10-31 Method for controlling a pump arrangement, and pump arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07120867A EP2060788B1 (fr) 2007-11-16 2007-11-16 Procédé de commande d'un agencement de pompe et agencement de pompe

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EP2060788B1 EP2060788B1 (fr) 2010-05-12

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US (1) US20090129941A1 (fr)
EP (1) EP2060788B1 (fr)
AT (1) ATE467763T1 (fr)
DE (1) DE502007003785D1 (fr)

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WO2013167248A1 (fr) * 2012-05-05 2013-11-14 Robert Bosch Gmbh Procédé permettant de faire fonctionner une pompe à fluide
DE102011015903B4 (de) 2011-04-01 2021-12-16 Robert Bosch Gmbh Pumpenanordnung
IT202300026499A1 (it) * 2023-12-12 2025-06-12 Innova S R L Kit iniezione condensa per unità di trattamento d’aria, in particolare per impianti waterloop

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US8700221B2 (en) * 2010-12-30 2014-04-15 Fluid Handling Llc Method and apparatus for pump control using varying equivalent system characteristic curve, AKA an adaptive control curve
WO2012104202A1 (fr) * 2011-02-01 2012-08-09 Alstom Technology Ltd Centrale à cycle mixte comprenant une installation de capture de co2
US9846416B2 (en) 2011-12-16 2017-12-19 Fluid Handling Llc System and flow adaptive sensorless pumping control apparatus for energy saving pumping applications
RU2611071C2 (ru) 2011-12-16 2017-02-21 Флюид Хэндлинг ЭлЭлСи Способ динамического линейного управления и устройство для управления насосом с переменной скоростью
WO2013107466A1 (fr) * 2012-01-18 2013-07-25 Festo Ag & Co. Kg Procédé de configuration d'un module de commande fluidique, produit logiciel informatique et système fluidique
JP5636555B2 (ja) * 2012-04-02 2014-12-10 株式会社メトラン ポンプユニット、呼吸補助装置
CN105556229B (zh) * 2014-02-28 2017-08-25 普莱克斯技术有限公司 加压产品流输送
JP6774905B2 (ja) * 2017-04-19 2020-10-28 レール・リキード−ソシエテ・アノニム・プール・レテュード・エ・レクスプロワタシオン・デ・プロセデ・ジョルジュ・クロード 液化ガス供給予備システムおよび液化ガス予備供給方法
CN108591041B (zh) * 2018-07-06 2023-05-26 华能国际电力股份有限公司 给水泵最小流量再循环阀控制系统及方法
EP3699534A1 (fr) * 2019-02-19 2020-08-26 Linde GmbH Procédé et installation de séparation d'air permettant de fournir de manière variable un produit dérivé de l'air gazeux sous pression
EP3699535A1 (fr) * 2019-02-19 2020-08-26 Linde GmbH Procédé et installation de séparation d'air permettant de fournir de manière variable un produit dérivé de l'air gazeux sous pression
CN111594426A (zh) * 2020-06-04 2020-08-28 深圳市三分之一睡眠科技有限公司 多气泵系统
DE102022110368A1 (de) 2022-04-28 2023-11-02 Audi Aktiengesellschaft Verfahren zum Betreiben eines Fluidkreislaufs für ein Kraftfahrzeug sowie entsprechender Fluidkreislauf
US20250084841A1 (en) * 2023-09-12 2025-03-13 Saudi Arabian Oil Company Action-oriented monitoring system for rotating equipment
CN116951800B (zh) * 2023-09-15 2024-01-02 广东美的暖通设备有限公司 控制方法、控制装置、双循环制冷系统及存储介质

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
DE102011015903B4 (de) 2011-04-01 2021-12-16 Robert Bosch Gmbh Pumpenanordnung
WO2013167248A1 (fr) * 2012-05-05 2013-11-14 Robert Bosch Gmbh Procédé permettant de faire fonctionner une pompe à fluide
IT202300026499A1 (it) * 2023-12-12 2025-06-12 Innova S R L Kit iniezione condensa per unità di trattamento d’aria, in particolare per impianti waterloop
WO2025126095A1 (fr) * 2023-12-12 2025-06-19 Innova S.R.L. Kit d'injection de condensation pour unités de climatisation, en particulier pour des installations de boucle d'eau

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EP2060788B1 (fr) 2010-05-12
ATE467763T1 (de) 2010-05-15
DE502007003785D1 (de) 2010-06-24
US20090129941A1 (en) 2009-05-21

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