Classifications

• • 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
  • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
  • F04B49/06—Control using electricity
  • F04B49/065—Control using electricity and making use of computers
• • 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
  • F04B2203/0214—Number of working motor-pump units

Definitions

• the present invention relates to a method for producing compressed fluid as well as an installation for producing compressed fluid for its implementation.
• compressed air production installation there is for example that described in the article entitled: "Compressed air, feedback on a sale by the cubic meter, published in ENERGIE PLUS, n ° 224 of April 15, 1999 , periodical of the Technical Association for Energy Environment. It includes at least two compressors, the discharge side of which is connected to a compressed air network; at least one of these compressors is at fixed speed and is sized to so that it runs continuously at 100% of its capacity; another is at variable speed and is adjusted so as to top up the required fluid flow rate. This last compressor is started or stopped according to the pressure observed in the air network. When the installation includes more than two compressors, only one has a variable flow rate.
• European patent application EP 1 249 675 describes a method for controlling a compressor battery by means of a frequency converter.
• this method often requires a financial investment that is hardly compatible with the expected energy gain, and it can only be envisaged for higher-end installations such as air conditioning stations or cold production systems.
• the object of the present invention is to overcome the drawbacks mentioned, and to propose an installation for supplying compressed fluid which is economical, in particular as regards energy consumption. Another object is a compressed fluid supply installation which has a low maintenance cost.
• the Applicant has noticed that, unexpectedly, it was possible to significantly improve the overall specific energy of a compressor installation by implementing the device described above. after. This is why, according to a first aspect, the subject of the invention is an installation for producing a compressed fluid comprising:
• n being greater than or equal to 1, the discharge side of which is connected to a compressed fluid network, - for each of the compressors, a connection line with an energy source,
• At least one switching means adapted to trigger the change of state of each of the compressors
• At least one pressure sensor suitable for measuring the pressure of the fluid prevailing in the compressed fluid network
• control means suitable for controlling one or the other of the switching means, characterized in that: the control means (s) are connected to one or more individual actuation means for each of the switching means , and the control means or means comprise one or more selection means, capable of selecting one or more of the compressors to be, spell started, spell passed in idle state, spell passed in charge mode, spell passed when stopped , according to a predetermined choice protocol, depending on the pressure of said compressed fluid in said network.
• the compressors used in the installation which is the subject of the present invention are preferably of the "all-or-nothing" type.
• the compressors are identical.
• all-or-nothing type compressor we mean mainly commercial compressors classified in this category and more particularly screw compressors.
• compressed fluid is meant a fluid whose total pressure is greater than one atmosphere and more particularly: air, oxygen (O 2 ), nitrogen (N 2 ), argon (Ar), dioxide carbon monoxide (CO 2 ), carbon monoxide (CO), helium (He), nitrous oxide (N 2 O), nitrogen monoxide (NO), mixtures of carbon dioxide nitrogen and oxygen, carbon dioxide and oxygen, nitrogen and carbon monoxide, helium and oxygen, such as, for example, mixtures (50% by volume (v / v) NO + 50% v / v O 2 ), (5% v / v CO 2 , 95% v / v O 2 ), (200 to 800 ppm NO in N 2 ), (78% He + 22% v / v O 2 ), (65% He + 35% O 2 ), (80% v /
• predetermined choice protocol in the context of the present invention, the set of measurements and / or counts and / or calculations to be carried out which gives rise to the choice to change or not to change, the state of the one or more of the compressors of said installation, when the pressure found in the compressed fluid network crosses one of the two limit values which are the low threshold pressure (PSL) and the high threshold pressure (PSH).
• PSL low threshold pressure
• PSH high threshold pressure
• the installation as defined above comprises from two to six compressors.
• the installation as defined above comprises at least one data acquisition means, capable of dating and determining each change of state of each compressor permanently or discontinuously over time. .
• the choice protocol is defined using all of the following parameters:
• - TMAV Minimum idling time before stopping
• - T p Duration of use before forced changeover
• TMCG running time under overall load
• control means comprise a programmable automaton characterized in that it comprises a central unit comprising a memory and a computer program able to select, when the pressure P observed exceeds the pressure thresholds PSH or PSL, the compressor (s) which, at a given time t, must be, spell started, spell passed idling, spell passed under load, or stopped, thanks to the protocol of choice as defined above.
• This programmable controller possibly includes means allowing its remote control.
• the compressors are connected in parallel by their discharge side, to a buffer reservoir of compressed fluid by means of a first connection pipe, said buffer tank being connected to the compressed fluid network by a second connecting pipe provided with a cut-off valve.
• the first connecting pipe is preferably provided with a filter.
• the invention also relates to a method for producing a compressed fluid implementing the installation as defined above, characterized in that that it includes, over time, one or other of the following operating steps:
• TRDEM is equal to 0 when there has been no start-up during the previous hour. It is generally accepted that a compressor cannot go directly from the operating state under load to the stopped state without it having remained in the idle operating state for a minimum duration, here called minimum duration no load before stop or TMAV. In the method as defined above, TMAV is generally greater than or equal to 30 seconds.
• the TMG or overall running time expresses the number of hours during which a given compressor has operated since the installation was started up.
• a compressor when a compressor has been in idle mode for a duration greater than TMAV, it has come to a stop.
• the compressor in stop is switched on in charge and the compressor in charge in charge went to a standstill.
• its subject is a computer program for carrying out the method as defined above.
• FIG. 1 is a schematic view of a compressed fluid production installation according to the invention.
• FIG. 2 shows the diagrams showing the patterns of fluid pressure over time and the corresponding regulation of a compressor.
• This installation 2 comprises three compressors 4, 6, 8, each provided with a switching means, 32, 34 and 36 capable of causing them to toggle in one of the three states of stopping, idling and running under load, which are connected in parallel to the inlet 10 of a buffer tank 12 of compressed fluid via a first connecting pipe 14 provided with a filter 16.
• An outlet 18 of the buffer tank 12 is connected to a user network d compressed air (not shown) via a second connection line 20 provided with a cut-off valve 22.
• the compressors 4, 6, 8 are lubricated screw compressors. Such compressors are, for example compressors of the DSD 201 / 7.5 bar type sold by the company KAESER.
• the installation 2 also comprises a source of electrical energy, in this case a source of three-phase power current 24.
• the installation 2 comprises three first lines 26, 28, 30 for connection to three wires. Each of the first connection lines 26, 28, 30 connects one of the compressors 4, 6, 8 to the current source 24.
• a fluid pressure sensor 54 is placed downstream of the compressors 4, 6, 8 in the fluid network, for example in the buffer tank 12.
• the installation 12 also comprises a control device, in this case a programmable automatic controller CMD.
• This CMD control device comprises an input 56 which is connected to the pressure sensor 54 by a sensor line 58, in order to observe the fluid pressure P established in the fluid network.
• the CMD command also comprises three outputs 60, 62, 64 which are connected to first 66, second 68 and third 70 control lines of the switching means 32, 34 and 36.
• the outputs 60, 62, 4 and the associated control lines 66, 68, 0, are adapted to control the switching of the compressors 4, 6 and 8.
• the outputs 60, 62, 64 are controlled by a central unit CPU of the CMD control according to the fluid pressure P.
• the programmable controller CMD includes a memory MEM in which the high pressure PSH and low pressure PSL thresholds are stored, and all of the data acquired relating to the parameters and variables indicated above and a PRG program for control of the installation able to select, when the pressure P observed exceeds the pressure thresholds PSH or PSL, the compressor or compressors which, at a given time t, must be, spjt started, spell switched to idling, spjt switched to loaded, spell stopped.
• a memory MEM in which the high pressure PSH and low pressure PSL thresholds are stored, and all of the data acquired relating to the parameters and variables indicated above and a PRG program for control of the installation able to select, when the pressure P observed exceeds the pressure thresholds PSH or PSL, the compressor or compressors which, at a given time t, must be, spjt started, spell switched to idling, spjt switched to loaded, spell stopped.
• the memory MEM stores, for each of the compressors 4, 6, 8, the total operating time of the associated compressor 4, 6, 8.
• the PRG program implemented in the CMD command controls the switching means 32, 34 and 36 according to an exclusive connection mode.
• the CMD control is furthermore provided with means for detecting a failure of one of the components of the installation 2.
• These means are connected to a telephone line 80 in order to warn the maintenance personnel in the event of a failure.
• Figure 2 shows an example of the pace over a time interval of one hour, the pressure P prevailing in the air network as well as two diagrams of the change of state of three compressors in parallel (CO1, CO2, CO3), according to the invention (new control law) and according to the state of the art (old law.

Landscapes

• Engineering & Computer Science (AREA)
• Computer Hardware Design (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Control Of Positive-Displacement Pumps (AREA)
• Carbon And Carbon Compounds (AREA)
• Fluid-Pressure Circuits (AREA)
• Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
• Separation By Low-Temperature Treatments (AREA)

Applications Claiming Priority (3)

Publications (2)

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• 2003
  • 2003-01-10 FR FR0300264A patent/FR2849906B1/fr not_active Expired - Fee Related
  • 2003-12-12 RU RU2005125419/06A patent/RU2005125419A/ru not_active Application Discontinuation
  • 2003-12-12 WO PCT/FR2003/050167 patent/WO2004070206A1/fr not_active Ceased
  • 2003-12-12 CN CN200380108615.6A patent/CN1738974A/zh active Pending
  • 2003-12-12 DE DE60322435T patent/DE60322435D1/de not_active Expired - Fee Related
  • 2003-12-12 AT AT03799723T patent/ATE402341T1/de not_active IP Right Cessation
  • 2003-12-12 AU AU2003299425A patent/AU2003299425A1/en not_active Abandoned
  • 2003-12-12 JP JP2004567804A patent/JP2006513360A/ja active Pending
  • 2003-12-12 US US10/541,807 patent/US20060099085A1/en not_active Abandoned
  • 2003-12-12 EP EP03799723A patent/EP1585901B1/de not_active Expired - Lifetime

Non-Patent Citations (1)

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