EP0967396B1 - Procédé d' opération des turbo-compresseurs - Google Patents

Procédé d' opération des turbo-compresseurs Download PDF

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Publication number
EP0967396B1
EP0967396B1 EP99106086A EP99106086A EP0967396B1 EP 0967396 B1 EP0967396 B1 EP 0967396B1 EP 99106086 A EP99106086 A EP 99106086A EP 99106086 A EP99106086 A EP 99106086A EP 0967396 B1 EP0967396 B1 EP 0967396B1
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EP
European Patent Office
Prior art keywords
regulator
magnitude
limiter
way
target
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Expired - Lifetime
Application number
EP99106086A
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German (de)
English (en)
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EP0967396A3 (fr
EP0967396A2 (fr
Inventor
Wilfried Dr.-Ing. Blotenberg
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MAN Turbo AG
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MAN Turbomaschinen AG
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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
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/02—Surge control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/02—Surge control
    • F04D27/0269—Surge control by changing flow path between different stages or between a plurality of compressors; load distribution between compressors

Definitions

  • the invention relates to a method and a Device for operating turbocompressors with several mutually influencing controllers.
  • Turbocompressors are often equipped with multiple controllers equipped.
  • the surge limit controller of a turbocompressor monitors z. B. the location of the compressor operating point in the map and opens if it is too small Compressor throughput a surge control valve for Suction side or to the atmosphere.
  • pressure or flow regulators are often used, whose actuator adjustable guide vanes or Throttle valves are.
  • the drive can also adjust the speed for capacity adjustment be adjusted.
  • An adjustment of the surge limit control valve is affected also the compressor end pressure or the flow to Process.
  • An adjustment of the actuator of the process variable controller has an impact on the location of the Operating point in the map and can therefore the surge limit controller intervene.
  • surge limit controller is considered more critical Turbo machine protection regulator to the fastest possible Response behavior set.
  • fastest controllers available are used that control the fastest valves available.
  • the process variable control must match the time behavior of the Process adapted.
  • pressure regulations are characterized by significantly longer time constants than those required for surge limit control.
  • the surge limit controller regulates one Fault clears much faster than the process variable controller. He has the surge limit control valve in the new one position required before the process variable controller reacted noticeably. An additional Decoupling of the surge limit regulators from each other is in not necessary in these cases.
  • the surge limit controller reacts to this and opens it Pump limit control valve to protect the compressor Piece. This means that less process medium is used in the process promoted and the flow (or pressure) on the Compressor pressure side drops.
  • the process variable controller notices this and increases the conveying capacity of the Compressor. The result is that the working point away from the surge line.
  • the Process variable controller reacts to this by the Delivery capacity of the compressor reduced accordingly. However, this brings the operating point back in again the proximity of the surge limit, so that the surge limit controller Pump limit control valve opens again.
  • the process begins from the front and can change if the time parameters are not chosen correctly and unfavorable phase position to a continuous oscillation of process size and surge limit control valve to lead.
  • Turbo compressors with several stage groups are especially if the medium is between different stages are fed in or withdrawn, with individual surge limit regulations per step group protected.
  • the surge limit controller take place among each other. If there is a fault on the suction side of the low pressure stage the pressure ratio increased above this level the working point of this stage moves in In the direction of the surge limit, causing the surge limit controller to intervene the low pressure stage may be required can, the pump limit control valve of the low pressure stage a piece opens. This causes a lowering the final pressure of the low pressure stage or the inlet pressure the high pressure stage. This goes along with one Increase the pressure ratio of the high pressure stage what Now open the surge limit control valve of this stage has the consequence.
  • the surge limit control valves Because with gas compressors, the surge limit control valves the gas on the pressure side to the suction side relax, causes the high pressure side to open Pump limit control valve an increase in suction pressure this stage and thus an increase in the final pressure of the Low pressure stage. The surge limit control of the low pressure stage this will further intervene forced, the low pressure surge limit control valve opens further.
  • the surge limit controller acts more violently than absolutely necessary and the surge limit control valve is opened further than to protect the compressor required. This causes that after the decay pump surge control valves again getting closed. Because the fault in the low pressure part has started, the surge limit controller of the low pressure stage closes this valve again. This increases the final pressure this stage and thus also the suction pressure of the High pressure stage. The pressure ratio of the high pressure stage decreases and the corresponding surge limit controller closes the high-pressure surge limit control valve. this has now again an influence on the low pressure part etc. Are the controls set to open a transient disorder with some Overdrive can respond, a phase shift mutual influence of the two surge limit controllers cannot be excluded.
  • the object of the invention is to provide a method for Decoupling the control loops in the way to create that even with the same timing behavior of all sizes vibration-stimulating interaction of the control loops among themselves is avoided.
  • a typical machine train for compressing gas consists of three in a row in the direction of flow arranged step groups.
  • One of those stages consists of the suction line of the low pressure stage, the compressor, the pressure line and one Blow pipe with the surge limit control valve, further a flow calculator for calculating the intake flow and a calculator to determine the Head.
  • the computers are on signal lines and with the pipes and other signal lines connected to the comparator.
  • a comparator determines the difference from the setpoint (delivery head) minus Actual value (flow) and always causes when the Actual value is too small in relation to the setpoint, one gradual opening of the surge limit control valve until the Actual flow rate exactly that of the respective delivery head dependent target flow corresponds.
  • the adjustment takes place according to the invention via the maximum selection, the PI controller and the signal line to the surge limit control valve.
  • a check valve decouples the first Compressor from the downstream medium pressure stage.
  • the actual flow is smaller than that of the delivery head dependent target flow, is in the comparator determined control difference positive and adjusted via the control line the output of the surge limit controller in Direction of another opening surge limit valve.
  • the controllers are now given a maximum selection upstream, one input of which is known Difference from the setpoint and actual value of the associated Compressor. This maximum selection becomes the control difference of the other compressor stages also impressed.
  • the effect of the system deviation is such that a positive signal lowers the controller output and so that the surge limit control valve opens and a negative one Signal the surge limit control valve closes.
  • the maximum selection now causes that whenever one of the three Machinery enters an operating area that is a opening the surge limit control valve requires this size is imposed on all three surge limit regulators and everyone Regulator its associated surge limit control valve via the Control lines opens accordingly. A mutual Influencing is prevented because everyone Pump limit control valves simultaneously and at the same Open the controller setting by the same amount.
  • the control difference is a via the signal line First order delay element and an adding Limiter activated.
  • This delimiter adds the Inputs signed, d. that is, it subtracts from the control difference that was delayed via the delay element Control difference. Is in steady state this difference zero so that the adder is only that Passes the signal of the maximum selection.
  • the delimiter is set to a range from 0 to 1, it limits negative values to zero.
  • the output signal of the delay element follows delayed.
  • the control difference can be the output signal of the limiter already become positive when the control difference itself is still negative.
  • a constant can be added to the limiter become. This constant causes an offset.
  • the output of the limiter only becomes greater than zero if the difference between the two other input variables exceeded the threshold set as a constant Has.
  • the correction variable acts on the process variable controller then such that when approaching the surge limit or when crossing the control line the entrance of the Process size controller is changed so that the Effect of the surge limit controller supports and Compressor moves out of the danger area.
  • the limiter e.g. Belly be achieved that when the working point is approached the input signal of the process variable controller to the surge limit can be influenced in such a way that only minor Gradients for a reduction in compressor performance be allowed. This is the process variable controller still effective, but can only have a limited effect intervention.
  • the surge limit controllers or the process variable controllers a gradient limiter with integrated input amplifier, Limiter and integrator connected downstream.
  • the limiter limits the control difference of the process variable controller. Since the process variable controller is usually switched as a proportional integral controller (PI controller) the limiter limits the gradient for the integral adjustment of the manipulated variable. Will the Limiter set to the limit value zero, changed the manipulated variable of the process variable controller at all no more.
  • PI controller proportional integral controller
  • the upper and lower limit of the limiter depending on one Process size can be varied. This is the control difference of the surge limit controller as a manipulated variable used.
  • a function generator allows the definition a non-linear relationship between system deviation of the surge limit controller and the effective one Limiter Limits.
  • the function generator can, for. B. be set so that with a control difference greater than 20% no limitation is effective up to a control difference of 3% can limit the square decrease with the control difference and at one Control difference below 3% the lower limit to zero put. Any other, including non-linear function curve is adjustable if necessary.
  • the top and the lower limit can also be configured separately. In this case, two function generators are separated for the upper and lower limits are used.
  • the Function encoder also directly on the control parameters of the Process size controller act and this accordingly to adjust.
  • the Controller (process variable controller or surge limit controller) Gradient limiter downstream.
  • a signal line transfers the output variable of the controller (process variable controller or surge limit controller) to the input amplifier a gradient limiter.
  • This amplifier is on set a high gain, so that at a slight difference between the output of the Controller and the output of the gradient limiter, fed back via an additional signal line, the Limiter receives a large input signal.
  • the limits of the delimiter determine the gradient for the Adjustment of the integrator.
  • the limiter is on the integrator only receives small values small input values and also adjusts its output if there is a deviation at the input of the amplifier only slowly.
  • the limit values can be set via another control line the limiter can be adjusted in the same way as previously for the limitation of the control difference of the Pump limit controller has been described.
  • the output line of the high pressure stage of the respective Final pressure can be recorded by a pressure transmitter and an additional target / actual value comparator are transferred, with another process variable controller the actuators of the guide vanes each of the three compressor stages can be addressed.
  • control parameters are between the maximum selection and the surge limit controller branched off and one Function generator supplied. This transfers its data on the above additional process variable controller.
  • an additional limiter of only specially selected controlled variables forwards.
  • the invention is based on schematic Embodiments described in more detail.
  • Fig. 1 shows an arrangement for decoupling a controller three-stage turbo compressor, in which each compressor stage (2, 22, 42) own surge limit control valves (5, 25, 45), each in the suction lines (1, 21, 41) of the own compressor stage (2, 22, 42) Blow off.
  • a machine train for the compression of gas consists of three arranged one behind the other in the direction of flow Level groups (2, 22, 42).
  • the three-stage compressor consists of the suction lines (1, 21, 41), the low pressure compressor (2), the medium pressure compressor (22) and the high pressure compressor (42), the pressure lines (3, 23, 43), the blow lines (4, 24, 44) with the surge limit control valves (5, 25, 45), the flow computers (6, 26, 46) for calculating the intake flow and the computer (7, 27, 47) for the minimum permissible target flow, which results from the final pressure or the delivery head is determined.
  • To calculate the Head is also the respective suction pressure and Suction temperature required.
  • the associated active lines are not shown.
  • the computers (6, 7), (26, 27) and (46, 47) are over Signal lines (8 and 9), (28 and 29) and (48 and 49) with the delivery pipelines and each over two further signal lines (10 and 11), (30 and 31) and (50 and 51) with the comparators (12, 32 and 52) connected.
  • Each comparator (12, 32, 52) determines the Difference from setpoint (delivery head) minus actual value (Flow) and always causes when the actual value in Ratio to setpoint is too small, a gradual one Opening of the corresponding surge limit control valves (5, 25 or 45) until the actual flow rate is exactly that of the respective flow rate dependent target flow equivalent.
  • the adjustment is made via a maximum selection (14, 34, 54), the surge limit controller (15, 35, 55) and the signal lines (16, 36, 56) to the surge limit control valve (5, 25, 45).
  • the check valve (17, 37) decouples the low pressure compressor (2) from the medium pressure compressor (22).
  • the measured values / signals of the target / actual value comparison (12, 32, 52) act via the control line (13, 33, 53) directly to the surge limit controller (15, 35, 55), which the Pump limit control valve (5, 25, 45) via the control line (16, 36, 56).
  • the actual flow is smaller than that of the delivery head dependent target flow, the control difference positive and adjusts the output of the surge limit controller (15, 35, 55) towards another opening one Valve (5, 25, 45).
  • the surge limit regulators (15, 35, 55) become one Maximum selection (14, 34 and 54) upstream, their an input the known difference between setpoint and Actual value of the associated surge limit control Compressor stage is. This maximum selection is the Control difference of the other target / actual value comparators (32 and 52) also stamped. The effect of Control difference is such that a positive signal Controller output (15, 35, 55) and thus the Pump limit control valve (5, 25, 45) opens and on negative signal the surge limit control valve (5, 25, 45) closes.
  • the maximum selection (14, 34, 54) now causes that whenever one of the three compressor stages (2, 22 or 42) enters an operating area that includes a opening the surge limit control valve (5, 22 or 42) requires this size for all three surge limit controllers (15, 35 and 55) and each surge limit controller (15, 35 or 55) its associated surge limit control valve (5, 25, 45) via the control line (16, 36, 56) opens accordingly. A mutual influence is prevented because all surge limit control valves (5, 25, 45) simultaneously and with the same Open the controller setting by the same amount.
  • Control difference is one over the signal line (60) First order delay element (61) and an adding Limiter (63) activated.
  • This delimiter (63) adds the inputs according to the sign, i. H. he subtracts from the control difference via the delay element (61) Delayed control difference. In the stationary State, this difference is zero, so the Adder (64) only the signal of the maximum selection (14) passes on.
  • the limiter (63) is on one Range set from 0 to 1, it limits negative ones Values to zero.
  • the output signal (60.2) of the Delay element (61) delayed in time At a major change in the control difference can
  • the output signal of the limiter (63) is already positive if the control difference itself is still negative is.
  • the effect of the Correction quantity, d. H. the exit of the limiter (63) becomes zero if the control difference is stationary assumes non-zero value.
  • the limiter (63) can have a constant (62) can be added. This constant (62) causes an offset. The output of the limiter (63) will only greater than zero if the difference between the two other input variables (60.1 and 60.2) as Has exceeded the set threshold.
  • this constant (62) can also be used without the delaying action of the PT1 link (61) is used become.
  • Another way to prevent mutual Influencing different control loops consists of the gradient for manipulated variable changes to limit.
  • the setpoint / actual value comparator (72) the process variable setpoint and the actual process value is activated. The difference these two values act via the signal line (73) and the limiter (74) on the process variable controller (78). This controller adjusts the associated actuator of the Turbo compressor (guide vanes, throttle element, Speed) in such a way that the actual process value is accurate corresponds to the setpoint.
  • the upper and lower Limit of the limiter (74) depending on one Process size can be varied.
  • the control difference of the surge limit controller (15) as a manipulated variable used.
  • the function generator (75) permits Definition of a nonlinear relationship between Control difference between the surge limit controller and the effective one Limiter Limits.
  • the process variable controller (78) reacts with its set one (adjustable as a parameter set) Time behavior on the input size.
  • a big rule difference on Input causes controller (78) to output its output quickly changed, with a small control difference at the entrance the exit only changes slowly.
  • the time behavior of the output variable can be arbitrary to be influenced.
  • the limiter (74) can change the Controller output completely in one direction or another can be prevented by controlled limitation
  • the controller output (78) can even have positive values in Are controlled in the direction of larger output values, even if the control difference at the input the controller output wants to lower.
  • Control difference of the process variable controller (78) can also from the function generator (75) via the control line (76) directly to the control parameters, especially the proportional gain and the reset time become. Through this control intervention, the same will happen effected as by the limiter (74) in the input of the Process variable controller (78).
  • the controller (15/78) (surge limit controller (15) or process variable controller (78)) a gradient limiter (80) downstream.
  • the signal line (79) transmits the output size of the controller (15/78) to the input amplifier (81).
  • This amplifier (81) is set to a high gain, so that at a slight difference between the output of the Controller (79) and the output of the gradient limiter (84) fed back via the signal line (85) Limiter (82) receives a large input signal.
  • the Limit values of the limiter (82) determine the gradient for the adjustment of the integrator (83). Is the Limiter (82) set to small values receives the Integrator (83) only small input values and adjusted its output (84) even if there is a deviation at the input of the amplifier (81) only slowly.
  • the limit values of the Limiter (82) can be adjusted in the same way as previously for the limitation of the control difference of the Regulator (15/78) was described.
  • Fig. 5 shows a circuit diagram corresponding to Fig. 1 with one on the pressure line (43) after the check valve (57) the third compressor stage (42) arranged Pressure transmitter (20), the control data on a Signal line (88) to a target-actual value comparator (12) and process variable setpoints (89) from the control system receives.
  • a process variable controller (78) transmits the target / actual value comparisons (Controlled variables) via a control line (87) to the actuators (18) for adjusting the Guide vanes (19) in the low, medium and high pressure turbo compressor stages (2, 22, 42).
  • Fig. 7 shows a circuit diagram of a low pressure turbocompressor stage (2), in which the control differences of the Target / actual value comparator (12) or from (33) and (53) are first passed to the maximum selection (14). As in FIG. 6, these control data become shown, on a surge limit controller (15) and transfer there to the surge limit control valve (5).
  • the function generator (75) can also Control data from the maximum selection (14) via a Transfer control line (76) to a limiter (74) are upstream of the process variable controller (78) is. This (78) is connected via a control line (87) the actuator (18) of the guide vanes (19) Low pressure stage (2) connected.

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Claims (17)

  1. Procédé pour faire fonctionner des turbomachines présentant au moins deux régulateurs s'influençant mutuellement,
    caractérisé en ce que des variables correctrices d'un premier et d'un second régulateurs échangées alternativement, le premier régulateur étant un régulateur de limite de pompe, interviennent dans la comparaison consigne/réel des deux régulateurs et découplent les sorties des variables de réglage des deux régulateurs de manière telle qu'une influence mutuelle est exclue.
  2. Procédé selon la revendication 1,
    caractérisé en ce que l'écart de régulation du premier régulateur agit sur une sélection de valeurs extrêmes en amont du second régulateur.
  3. Procédé selon la revendication 1,
    caractérisé en ce que la variable de commande qui déplace la vanne du régulateur de limite de pompe à vitesse de variable d'actionnement maximale agit, à partir de chaque régulateur, sur chaque actionneur.
  4. Procédé selon la revendication 1,
    caractérisé en ce que la variable correctrice efficace est calculée à partir de la différence entre une variable correctrice initiale temporisée par un temporisateur du premier ordre et la variable non temporisée.
  5. Procédé selon la revendication 4,
    caractérisé en ce qu'un décalage est appliqué à la variable correctrice.
  6. Procédé selon les revendications 4 et 5,
    caractérisé en ce que la variable correctrice limite le gradient pour la variation d'une variable de réglage d'un autre régulateur.
  7. Procédé selon la revendication 6,
    caractérisé en ce que le gradient pour la limitation de la variable de réglage est une fonction linéaire ou non linéaire de la variable correctrice.
  8. Procédé selon la revendication 6 ou 7,
    caractérisé en ce que la limitation pour la variable de réglage est activée ou désactivée en fonction d'une variable de processus.
  9. Procédé selon la revendication 6 à 8,
    caractérisé en ce que la variable correctrice agit sur les paramètres des régulateurs et les fait varier.
  10. Dispositif pour la mise en oeuvre du procédé de fonctionnement de turbocompresseurs à plusieurs étages présentant au moins deux régulateurs de limite de pompe s'influençant mutuellement,
    caractérisé en ce
    qu'en amont de chaque régulateur de limite de pompe (15, 35, 55) d'un étage de turbocompresseur (2, 22, 42) est montée une sélection de maximales (14, 34, 54), dans laquelle sont transmises à partir du comparateur de valeurs de consigne-réelle (12, 32, 52) des variables correctrices échangées alternativement par l'intermédiaire de lignes de commande (13, 33, 53) et
    que chaque régulateur de limite de pompe (15, 35, 55) agit par l'intermédiaire de lignes de commande (16, 36, 56) sur les vannes de régulation de limite de pompe (5, 25, 45) correspondantes.
  11. Dispositif selon la revendication 10,
    caractérisé en ce
    qu'en aval de chaque comparateur de valeurs de consigne-réelle (12, 32, 52) du régulateur de limite de pompe (15, 35, 55) sont respectivement montés un organe temporisateur du premier ordre (61) et un limiteur additionneur (63),
    que le limiteur (63) additionne les entrées de différence de régulation conformément à leur signe et les limite à des valeurs seuils réglable et
    que l'additionneur (64) transmet la différence de régulation calculée (sélection de valeurs extrêmes) au régulateur de limite de pompe (15, 35, 55).
  12. Dispositif selon la revendication 11,
    caractérisé en ce qu'à la variable correctrice, en amont du limiteur (63), est appliquée une constante (62).
  13. Dispositif selon la revendication 10,
    caractérisé en ce
    qu'entre le comparateur de valeurs de consigne-réelle (12, 32, 52) et le limiteur (74) est monté respectivement un transmetteur de fonction (75) ou
    que le comparateur de valeurs de consigne-réelle (12, 32, 52) par l'intermédiaire de la ligne de commande (60) est relié directement au régulateur de limite de pompe (15, 35, 55),
    qu'un autre comparateur de valeurs de consigne-réelle (72) est couplé au limiteur (74), qui transmet ses données à un régulateur de variable de processus (78) et
    que le régulateur de limite de pompe (15) est en outre couplé au transmetteur de fonction (75) par l'intermédiaire d'une ligne de signaux (60).
  14. Dispositif selon la revendication 10,
    caractérisé en ce
    qu'en aval du régulateur (15 ou 78) est monté un limiteur de gradient (80), les données du régulateur (15 ou 78) étant transmises à un amplificateur d'entrée (81),
    que l'amplificateur d'entrée (81) est relié à un limiteur (82) et celui-ci à un intégrateur (83) et
    que les données de sortie (84) sont transmises en retour à l'amplificateur d'entrée (81) par l'intermédiaire d'une ligne de commande (85).
  15. Dispositif selon la revendication 10,
    caractérisé en ce
    que sur la ligne de pression (43) est disposé un convertisseur de mesure de pression (20), qui transmet des données par l'intermédiaire d'une ligne de signaux (88) à un comparateur de valeurs de consigne-réelle (12),
    qu'un régulateur de variable de processus (78) transmet les comparaisons de valeurs de consigne-réelle (variables de régulation) par l'intermédiaire d'une ligne de commande (87) à l'actionneur (18) pour régler les aubes directrices (19) dans les étages de turbocompresseur (2, 22, 42) et
    que des valeurs de consigne (89) des variables de processus sont transmises par le système de pilotage au comparateur (20) de valeurs de consigne-réelle.
  16. Dispositif selon la revendication 15,
    caractérisé en ce
    que sur la ligne de pression (3) est disposé en aval du clapet anti-retour (17) un convertisseur de mesure de pression (20), qui transmet des données à un comparateur (72) de valeurs de consigne-réelle par l'intermédiaire d'une ligne de commande (71) et achemine celles-ci par l'intermédiaire d'une ligne de signaux (73) vers un régulateur de variables de processus (78),
    qu'une sélection de maximales (14) transmet des données du comparateur (12) de valeurs de consigne-réelle à un transmetteur de fonction (75) ou à un régulateur de limite de pompe (15),
    que la sélection de maximales (14) reçoit d'autres données par l'intermédiaire de la ligne de commande (33) et (35),
    que le régulateur de limite de pompe (15) est relié par une ligne de commande (16) à la vanne de limitation de pompe (5),
    que les données sont transmises au régulateur de variables de processus (78) par une ligne de commande (76) et
    que le régulateur de variables de processus (78) transmet ses données par l'intermédiaire d'une ligne de signaux (87) à l'actionneur (18) des aubes directrices (19) dans les étages de turbocompresseur (2, 12, 42).
  17. Dispositif selon les revendications 15 à 16,
    caractérisé en ce
    que le transmetteur de fonction (75) transmet par l'intermédiaire d'une ligne de commande (76) des données de la sélection de maximales (14) à un limiteur (74) qui est monté en amont du régulateur de variables de processus (78).
EP99106086A 1998-06-26 1999-03-26 Procédé d' opération des turbo-compresseurs Expired - Lifetime EP0967396B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19828368 1998-06-26
DE19828368A DE19828368C2 (de) 1998-06-26 1998-06-26 Verfahren und Vorrichtung zum Betreiben von zwei- oder mehrstufigen Verdichtern

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EP0967396A2 EP0967396A2 (fr) 1999-12-29
EP0967396A3 EP0967396A3 (fr) 2001-07-25
EP0967396B1 true EP0967396B1 (fr) 2003-05-07

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US (1) US6164901A (fr)
EP (1) EP0967396B1 (fr)
DE (2) DE19828368C2 (fr)

Cited By (1)

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EP0967396A3 (fr) 2001-07-25
DE19828368C2 (de) 2001-10-18
US6164901A (en) 2000-12-26
EP0967396A2 (fr) 1999-12-29
DE59905412D1 (de) 2003-06-12

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