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WO2007118275A1 - Recyclage d'air comprimé - Google Patents

Recyclage d'air comprimé Download PDF

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Publication number
WO2007118275A1
WO2007118275A1 PCT/AU2007/000489 AU2007000489W WO2007118275A1 WO 2007118275 A1 WO2007118275 A1 WO 2007118275A1 AU 2007000489 W AU2007000489 W AU 2007000489W WO 2007118275 A1 WO2007118275 A1 WO 2007118275A1
Authority
WO
WIPO (PCT)
Prior art keywords
compressed air
pressure
control arrangement
compressor
machinery
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.)
Ceased
Application number
PCT/AU2007/000489
Other languages
English (en)
Inventor
Anthony John Kitchener
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.)
ATELIERS FRANCOIS
Original Assignee
ATELIERS FRANCOIS
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
Priority claimed from AU2006901970A external-priority patent/AU2006901970A0/en
Application filed by ATELIERS FRANCOIS filed Critical ATELIERS FRANCOIS
Publication of WO2007118275A1 publication Critical patent/WO2007118275A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/14—Energy-recuperation means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/048—Arrangements for compressed air preparation, e.g. comprising air driers, air condensers, filters, lubricators or pressure regulators

Definitions

  • the present invention relates to improvements in control systems for recycling unused compressed air in manufacturing processes.
  • This intermediate pressure air may either be used to pre-blow the bottle (and thereby save air that would otherwise be used for this purpose) or directed to a booster compressor whereby the vented air is raised to the required pressure for blowing a subsequent bottle. It is also known in the art to direct this intermediate pressure air to a multistage compressor and inject this air between stages at the appropriate pressure level. This is disclosed, for example in European Patent Application No. 05450084.8. A major shortcoming of the above mentioned schemes is that there is little flexibility in the selection of the intermediate pressure.
  • the selection of the intermediate pressure either dictates, or is dictated by, the relative displacement volumes of the low pressure compressor and the booster (or in the case of a multistage compressor) the sizing of the cylinders.
  • This sizing problem means that the recycling does not occur at the optimum pressure level and so the expected savings do not always eventuate.
  • the aim of the present invention is to provide a control arrangement for recycling compressed air unused in a manufacturing process (or similar) in a manner allowing flexibility in the selection of the intermediate pressure and at the same time allow the maximum possible power saving to be made.
  • the present invention provides a control arrangement for the supply of compressed air to machinery using said compressed air wherein some compressed air is vented to atmosphere and some compressed air is available for recycling, said control arrangement being characterized by a primary compressor means and a booster compressor means each being connected via discharge line means to a pressure vessel from which said machinery draws compressed air at a first predetermined pressure, said booster compressor means being connected via a suction line to said machinery and being adapted Jto receive recycled compressed air at an intermediate pressure less than said first predetermined pressure via said suction line, said primary compressor means being at least partially driven by an electric motor means controlled by a variable speed drive device, pressure sensor means arranged to sense pressure in said pressure vessel and said variable speed drive device being controlled in response to pressure sensed by said pressure sensor means.
  • the present invention also provides a control arrangement for the supply of compressed air to machinery using part of said compressed air and for recycling unused compressed air, said control arrangement being characterized by a primary compressor means delivering compressed air to storage vessel means from which said machinery draws compressed air at a first predetermined pressure, said primary compressor means being driven by a variable speed drive means and a booster compressor means receiving unused compressed air from said machinery and also delivering compressed air compressed by said booster compressor means to said storage vessel means, said booster compressor means being driven by fixed speed drive means.
  • variable speed drive device adjusts the frequency of mains electricity to thereby vary the speed of the electric motor means in response to sensed pressure level changes sensed by said pressure sensor means in said pressure vessel.
  • the booster compressor means is driven by electric motor means receiving mains electricity. If the intermediate pressure drops to a second predetermined pressure, said booster compressor means may be shut down and compressed air to said pressure vessel will then be solely supplied by said primary compressor means.
  • the primary compressor means may include a plurality of compression stages that progressively increase the pressure of the air being compressed.
  • the aforesaid compression stages may be provided by reciprocating compressor stages, rotary compressor stages, or a combination of reciprocating and rotary compressor stages.
  • the booster compressor means may also include a plurality of compressor stages.
  • the compressor stages may be reciprocating compressor stages, rotary compressor stages, or a combination of both reciprocating and rotary compressor stages.
  • the number of compressor stages in the booster compressor means is less than the number of stages in the primary compressor means.
  • the machinery utilizing the compressed air is blow moulding machinery for producing bottles or containers.
  • a control arrangement 20 is schematically illustrated including variable speed drive device 2 receiving and controlling the frequency of mains electricity 11 and providing same at 12 to electric motor means Mi comprising one or more motors driving a primary compressor system 1 including a number of compressor stages to achieve a desired high compression level.
  • the primary compressor system 1 provides compressed air to a storage pressure vessel 3 via line 13. Compressed air is drawn from the vessel 3, preferably via a drier 4 and lines 14, by machinery 5 utilizing the compressed air.
  • the machinery 5 may be blow moulding machinery for producing bottles or containers from, for example PET, but could be any other machinery utilizing the compressed air.
  • booster compressor system 6 conveniently formed by a number of compressor stages normally less than the number of stages of the primary compressor system 1 , to the pressure vessel 3 via line 7.
  • the compressor stages for each of the primary and the booster compressor systems 1 , 6 may be reciprocating compressor stages, rotary compressor stages, or a combination of both.
  • the booster compressor system 6 may also be driven by electric motor means Me comprised of one or more motors which is conveniently operated directly by mains electricity 11.
  • mains electricity used throughout this specification including the annexed claims, should be understood to simply mean a standard fixed supply of electricity available to the machinery whether or not it is modified from an external source.
  • This arrangement enables the use of high pressure air for the blow moulding of PET and similar bottles but other applications are also possible.
  • the high pressure air is 25 to 40 bars pressure.
  • the intermediate pressure available to the suction line 9 leading to the booster compressor system 6 may be from 5 to 15 bars. The optimum intermediate pressure varies depending on bottle blowing rate, bottle size and bottle blowing pressure amongst other factors.
  • the primary compressor system 1 is a 40 bar multistage compressor which compresses air from atmosphere to 40 bars. If no recycling is used this compressor can supply the complete capacity needed by the blow moulding machine.
  • the 40 bar air supplied by the compressor system 1 passes first to the pressure vessel 3 and dryer 4 before entering the blow moulding machine 5.
  • some air is vented at 8 and some may be recycled.
  • the recycled air at lower pressure (from 5 to 15 bars) passes via line 9 to the booster compressor system 6.
  • the booster compressor system 6 raises the air pressure back to 40 bars and passes same via line 7 to the pressure vessel 3.
  • the 40 bar primary compressor system 1 may be a 3 stage compressor and the booster compressor system 6 may be a two stage compressor although other numbers of stages may be used.
  • the primary compressor system 1 is powered by mains electricity 11 via a Variable Speed Drive (VSD) 2 which adjusts the frequency of the mains electricity so the compressor speed may be adjusted so the air compressed matches the volume needed by the blow moulding machine 5.
  • VSD Variable Speed Drive
  • the volume of air supplied by the 40 bar primary compressor 1 varies depending on the rate of recycling. Accordingly the speed of the primary compressor system 1 is controlled by a pressure sensor 10 which in turn alters the frequency of the electricity supplied to the electric motor or motors Mi driving the primary compressor system 1. This keeps the pressure of vessel 3 at 40 bars, despite the amount of air consumed by the blow moulding machine changing, due to bottle size, speed and finally blowing pressure.
  • the final blowing pressure may be chosen to be less than 40 bars but for the simplicity of this disclosure 40 bars is used as an example, the use of another blowing pressure does not change the nature of the control arrangement.
  • VSD Variable Speed Drives
  • the discharge pressure of the booster compressor system 6 is controlled by the pressure in the pressure vessel 3.
  • a feature of booster compressors is that the mass flow rate through the booster compressor reduces as the suction pressure falls. If a high rate of recycling is desired the following occurs.
  • the speed of the primary compressor system 1 is low.
  • the blow moulding machine 5 returns a large mass of air via line 9 to the booster compressor system 6, which in turn raises the pressure to 40 bars in vessel 3. If a medium rate of recycling is allowed by the blow moulding machine 5, the mass flow to the compressor booster 6 falls and so too does the pressure in line 9.
  • a lower suction pressure at the inlet of the booster compressor system 6 means less mass is pumped back to vessel 3. Accordingly the pressure in vessel 3 would fall slightly and so this is sensed by sensor 10 which in turn speeds up the frequency delivered by the variable speed drive (VSD) 2 so a constant pressure is maintained. If a low rate of recycling is needed the intermediate pressure falls lower again and in turn the mass compressed by the booster compressor system 6 leads to the primary compressor system 1 speeding up again. Finally, if no recycling is allowed by the blowing machine, at a certain level, say ⁇ 3 or 4 bars in line 9 then the booster is shut down and all air is supplied by the primary compressor system 1.
  • the advantage of this system is that both compressor systems 1 and 6 run at full load so a maximum amount of power is saved.
  • the control of the booster compressor 6 is very simple.
  • the high pressure primary compressor system 1 runs mostly at speeds below full speed which greatly extends ring and valve life.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

L'invention concerne un système de commande (20) de l'alimentation en air comprimé de machines (5) dans lequel une partie de l'air comprimé utilisé est évacuée dans l'atmosphère et une partie de l'air comprimé inutilisé est disponible pour le recyclage, le système de commande (20) comprenant un système de compresseur primaire (1) et un système de précompresseur (6) tous deux connectés par une conduite d'évacuation (13, 7) à un récipient sous pression (3) à partir duquel les machines (5) s'alimentent en air comprimé à une première pression désirée, le système de précompresseur 6) étant connecté aux machines (5) par une conduite d'aspiration (9) et étant conçu pour recevoir par ladite conduite d'aspiration (9) l'air comprimé recyclé à une pression intermédiaire inférieure à la première pression, le système de compresseur primaire (1) étant actionné par un ou plusieurs moteurs électriques (M1) commandés par un mécanisme d'entraînement à vitesse variable (2), un capteur de pression (10) étant disponible pour mesurer la pression dans le récipient sous pression (3) et ledit mécanisme d'entraînement à vitesse variable (2) étant commandé selon la pression mesurée par le capteur de pression (10).
PCT/AU2007/000489 2006-04-13 2007-04-12 Recyclage d'air comprimé Ceased WO2007118275A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2006901970A AU2006901970A0 (en) 2006-04-13 Recycling compressed air
AU2006901970 2006-04-13

Publications (1)

Publication Number Publication Date
WO2007118275A1 true WO2007118275A1 (fr) 2007-10-25

Family

ID=38608966

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2007/000489 Ceased WO2007118275A1 (fr) 2006-04-13 2007-04-12 Recyclage d'air comprimé

Country Status (1)

Country Link
WO (1) WO2007118275A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2710109C1 (ru) * 2019-05-16 2019-12-24 Сергей Яковлевич Данилов Способ вторичного использования сжатого воздуха в производственном процессе

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4108500A (en) * 1975-09-01 1978-08-22 Claudius Peters Ag And Maxpeters Gesellschaft Fuer Verfahrenstechnik Mbh Process and equipment for effecting savings in compressed gases during injection of solids by means of pneumatic conveyors
US5507601A (en) * 1988-09-19 1996-04-16 Mori-Gumi Co., Ltd. Method of transferring water with compressed air
GB2358890A (en) * 2000-02-02 2001-08-08 Sean Lewis Recirculating stored compressed gas motor arrangement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4108500A (en) * 1975-09-01 1978-08-22 Claudius Peters Ag And Maxpeters Gesellschaft Fuer Verfahrenstechnik Mbh Process and equipment for effecting savings in compressed gases during injection of solids by means of pneumatic conveyors
US5507601A (en) * 1988-09-19 1996-04-16 Mori-Gumi Co., Ltd. Method of transferring water with compressed air
GB2358890A (en) * 2000-02-02 2001-08-08 Sean Lewis Recirculating stored compressed gas motor arrangement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2710109C1 (ru) * 2019-05-16 2019-12-24 Сергей Яковлевич Данилов Способ вторичного использования сжатого воздуха в производственном процессе

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