US20060099085A1 - Plant for producing compressed gas and method for using said plant - Google Patents

Plant for producing compressed gas and method for using said plant Download PDF

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Publication number
US20060099085A1
US20060099085A1 US10/541,807 US54180705A US2006099085A1 US 20060099085 A1 US20060099085 A1 US 20060099085A1 US 54180705 A US54180705 A US 54180705A US 2006099085 A1 US2006099085 A1 US 2006099085A1
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US
United States
Prior art keywords
compressor
compressing
switching
switched
idling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/541,807
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English (en)
Inventor
Francois Pancrazi
Stephane Laroye
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.)
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
LAir Liquide SA a Directoire et Conseil de Surveillance pour lEtude et lExploitation des Procedes Georges Claude
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LAir Liquide SA a Directoire et Conseil de Surveillance pour lEtude et lExploitation des Procedes Georges Claude filed Critical LAir Liquide SA a Directoire et Conseil de Surveillance pour lEtude et lExploitation des Procedes Georges Claude
Assigned to L'AIR LIQUIDE, SOCIETE ANONYME A DIRECTOIRE ET CONSEIL DE SURVEILLANCE POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE reassignment L'AIR LIQUIDE, SOCIETE ANONYME A DIRECTOIRE ET CONSEIL DE SURVEILLANCE POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LAROYE, STEPHANE, PANCRAZI, FRANCOIS
Publication of US20060099085A1 publication Critical patent/US20060099085A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • 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 and to a compressed fluid production plant for implementing it.
  • European patent application EP 1 249 675 describes a method for controlling a bank of compressors using a frequency converter.
  • this method often entails a financial investment that is not really compatible with the anticipated energy saving, and it is conceivable only for the most top-of-the-range plants such as conditioned-air stations or refrigeration systems.
  • the subject of the invention is a plant for producing a compressed fluid, comprising:
  • n compressors n being greater than or equal to 1, the delivery side of which is connected to a compressed fluid network
  • At least one switching means designed to trigger the change in status of each of the compressors
  • At least one pressure sensor designed to measure the pressure of the fluid in the compressed fluid network
  • control means designed to control one or other of the switching means
  • control means are connected to one or more individual actuating means for actuating each of the switching means, and
  • control means comprise one or more selection means able to select one or more compressors that are to be either started, or switched to idling, or switched to compressing, or switched off, according to a predetermined selection protocol dependent on the pressure of said compressed fluid in said network.
  • a status is intended in the context of the present invention to mean, for each compressor, the following three statuses:
  • the compressor is compressing.
  • the compressors used in the plant that is the subject of the present invention are preferably of the “all-or-nothing” type.
  • the compressors are identical.
  • An “all-or-nothing” type compressor is mainly intended to denote the commercially available compressors categorized into this category and more specifically screw compressors.
  • a compressed fluid is to be understood as meaning a fluid whose total pressure is higher than one atmosphere and, more particularly: air, oxygen (O 2 ), nitrogen (N 2 ), argon (Ar), carbon dioxide (CO 2 ), carbon monoxide (CO), helium (He), nitrous oxide (N 2 O), nitrogen monoxide (NO), mixtures of nitrous oxide and oxygen, of carbon dioxide and oxygen, of nitrogen and carbon monoxide, of helium and oxygen, such as, for example, the following mixtures: 50% by volume (v/v) N 2 O+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/v He+20% v/v O 2 , or mixtures of nitrogen and carbon dioxide.
  • the plant as defined hereinabove is a plant for producing compressed air.
  • a predetermined selection protocol is to be understood in the context of the present invention as meaning all the measurements and/or counts and/or calculations to be performed which generate the choice to change or alternatively not to change, the status of one or more of the compressors of said plant when the pressure observed in the compressed fluid network crosses one of the two limit values which are the lower threshold pressure (PSL) and the upper threshold pressure (PSH).
  • PSL lower threshold pressure
  • PSH upper threshold pressure
  • the plant as defined hereinabove comprises from two to six compressors.
  • the plant as defined hereinabove comprises at least one data acquisition means able to date and to determine each change of status of each compressor constantly or discontinuously over time.
  • the selection protocol is defined by all of the following parameters:
  • N C Maximum number of compressor start-ups per hour; this parameter is set by the compressor manufacturer.
  • TMAV Minimum idling before switch-off time
  • T p Time to run before forced switch-over
  • TMAV′ Minimum idling before switch-to-compressing time.
  • T Date in current time.
  • T C/V Date of the last change of status (compressing to idling) in the last hour;
  • TMG Total number of running hours since the plant was switched on (total running time);
  • T 1 , T 2 . . . T NC Collection of start-up dates in the last hour from T 1 for the most recent start-up to T NC for the oldest start-up;
  • N D Number of start-ups performed in the last hour
  • TRDEM Time to next available start-up.
  • TMCG total compressing time
  • control means comprise a programmable controller 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 or compressors which, at a given moment t, need to be either started, or switched to idling, or switched to compressing, or switched off, by virtue of the selection protocol as defined hereinabove.
  • This programmable controller possibly comprises means allowing it to be controlled remotely.
  • the compressors are connected in parallel via their delivery side to a buffer reservoir of compressed fluid by means of a first linking pipe, said buffer reservoir being connected to the compressed fluid network by a second linking pipe equipped with a shut-off valve.
  • the first linking pipe is preferably equipped with a filter.
  • Another subject of the invention is a method for producing a compressed fluid using the plant as defined hereinabove, characterized in that it comprises, in the course of time, one or other of the following operating steps:
  • the number N C is generally between 2 and 8.
  • N C is determined on the basis of a uniform distribution of the start-ups of the compressor in a given hour.
  • This time termed the time to next available start-up, or TRDEM, expressed in hours, is therefore less than (1/N C )h.
  • TRDEM is equal to 0 when there has been no start-up in the previous hour.
  • TMAV minimum idling before switch-off time
  • TMAV is generally greater than or equal to 30 seconds.
  • the TMG or total running time expresses the number of hours for which a given compressor has been running since the plant was started up.
  • a compressor when a compressor has been idling for a length of time greater than TMAV, it is switched off.
  • the switched-off compressor when, in the plant, at least one of the compressors is switched off, and at least one of the compressors is compressing, when the time since the last start-up of said compressing compressor is greater than a switch-over time termed T P , and its TMG is greater than the TMG of the switched-off compressor, the switched-off compressor is switched to compressing and the compressing compressor is switched off.
  • the method as described hereinabove is particularly suited to the production of compressed air.
  • a subject of this invention is a computer program for carrying out the method as defined hereinabove.
  • FIG. 1 is a schematic view of a compressed fluid production plant according to the invention.
  • FIG. 2 represents diagrams showing the changes in the pressure of the fluid over time and the corresponding regulation of a compressor.
  • This plant 2 comprises three compressors 4 , 6 , 8 , each equipped with a switching means 32 , 34 and 36 able to switch them into one of the three statuses that are switched off, idling and compressing, which are connected in parallel to the inlet 10 of a buffer reservoir 12 of compressed fluid by means of a first linking pipe 14 equipped with a filter 16 .
  • An outlet 18 of the buffer reservoir 12 is connected to a compressed air user network (not depicted) by means of a second linking pipe 20 equipped with a shut-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 marketed by KAESER.
  • the plant 2 further comprises an electric power source, in this instance a three-phase power source 24 .
  • the plant 2 comprises three first three-wire connecting lines 26 , 28 , 30 .
  • Each of the first connecting lines 26 , 28 , 30 connects one of the compressors 4 , 6 , 8 to the power source 24 .
  • a pressure sensor 54 for sensing the pressure of the fluid is located downstream of the compressors 4 , 6 , 8 in the fluid network, for example in the buffer reservoir 12 .
  • the plant 12 further comprises a control device, in this instance a programmable controller CMD.
  • This control device CMD comprises an input 56 which is connected to the pressure sensor 54 by a sensor line 58 , so as to observe the fluid pressure P in the fluid network.
  • the controller CMD further comprises three outputs 60 , 62 , 64 which are connected to first 66 , second 68 and third 70 control lines for controlling the switching means 32 , 34 and 36 .
  • the outputs 60 , 62 , 64 and the associated control lines 66 , 68 , 70 are designed to control the switching over of the compressors 4 , 6 and 8 .
  • the outputs 60 , 62 , 64 are slaved by a central processing unit CPU of the controller CMD according to the fluid pressure P.
  • the programmable controller CMD comprises a memory MEM in which the upper pressure threshold PSH and lower pressure threshold PSL are stored, together with all the acquired data relating to the parameters and variables mentioned hereinabove and a program PRG for controlling the plant able, when the observed pressure P crosses the pressure thresholds PSH or PSL, to select that or those compressors which, at a given moment t, need to be either started up, or switched to idling, or switched to compressing, or switched off.
  • the memory MEM stores, for each of the compressors 4 , 6 , 8 , the total running time of the associated compressor 4 , 6 , 8 .
  • the program PRG used in the controller CMD controls the switching means 32 , 34 and 36 according to an exclusive connection mode.
  • the controller CMD is also equipped with detection means for detecting a failure of one of the components of the plant 2 .
  • These means are connected to a telephone line 80 so that the maintenance personnel can be alerted in the event of a failure.
  • FIG. 2 depicts an example of the variation, over a space of time of one hour, in the pressure P obtaining in the air network and two diagrams of the changes in status of three compressors in parallel (CO 1 , CO 2 , CO 3 ) according to the invention (new control law) and according to the state of the art (old law).
  • the abscissa of the two diagrams represent the various statuses of the three compressors: (MC compressing; MV: idling; SB: switched off).

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  • 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)
  • Separation By Low-Temperature Treatments (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
US10/541,807 2003-01-10 2003-12-12 Plant for producing compressed gas and method for using said plant Abandoned US20060099085A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0300264A FR2849906B1 (fr) 2003-01-10 2003-01-10 Installation de production d'un gaz comprime, et procede d'exploitation de cette installation
FR03/00264 2003-01-10
PCT/FR2003/050167 WO2004070206A1 (fr) 2003-01-10 2003-12-12 Installation et procede de production d’un gaz comprime,

Publications (1)

Publication Number Publication Date
US20060099085A1 true US20060099085A1 (en) 2006-05-11

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Family Applications (1)

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US10/541,807 Abandoned US20060099085A1 (en) 2003-01-10 2003-12-12 Plant for producing compressed gas and method for using said plant

Country Status (10)

Country Link
US (1) US20060099085A1 (de)
EP (1) EP1585901B1 (de)
JP (1) JP2006513360A (de)
CN (1) CN1738974A (de)
AT (1) ATE402341T1 (de)
AU (1) AU2003299425A1 (de)
DE (1) DE60322435D1 (de)
FR (1) FR2849906B1 (de)
RU (1) RU2005125419A (de)
WO (1) WO2004070206A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170292522A1 (en) * 2016-04-12 2017-10-12 Toyota Motor Engineering & Manufacturing North America, Inc. Compressed air system and method of operating same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103185001B (zh) * 2011-12-30 2016-06-29 北京谊安医疗系统股份有限公司 制氧机用压缩泵控制系统及其控制方法
CN110735784A (zh) * 2018-07-21 2020-01-31 河南新野纺织股份有限公司 空压机智能控制系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5054995A (en) * 1989-11-06 1991-10-08 Ingersoll-Rand Company Apparatus for controlling a fluid compression system
US6055851A (en) * 1996-08-12 2000-05-02 Hitachi Construction Machinery Co., Ltd. Apparatus for diagnosing failure of hydraulic pump for work machine
US20020182082A1 (en) * 1994-11-23 2002-12-05 Centers Steven D. System and methods for controlling rotary screw compressors
US6595757B2 (en) * 2001-11-27 2003-07-22 Kuei-Hsien Shen Air compressor control system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5874883A (ja) * 1981-10-28 1983-05-06 Hokuetsu Kogyo Co Ltd 圧縮機の台数制御装置
JPH0658112B2 (ja) * 1981-10-31 1994-08-03 北越工業株式会社 圧縮機の台数制御装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5054995A (en) * 1989-11-06 1991-10-08 Ingersoll-Rand Company Apparatus for controlling a fluid compression system
US20020182082A1 (en) * 1994-11-23 2002-12-05 Centers Steven D. System and methods for controlling rotary screw compressors
US6055851A (en) * 1996-08-12 2000-05-02 Hitachi Construction Machinery Co., Ltd. Apparatus for diagnosing failure of hydraulic pump for work machine
US6595757B2 (en) * 2001-11-27 2003-07-22 Kuei-Hsien Shen Air compressor control system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170292522A1 (en) * 2016-04-12 2017-10-12 Toyota Motor Engineering & Manufacturing North America, Inc. Compressed air system and method of operating same
US10590937B2 (en) * 2016-04-12 2020-03-17 Toyota Motor Engineering & Manufacturing North America, Inc. Compressed air system and method of operating same

Also Published As

Publication number Publication date
RU2005125419A (ru) 2006-02-20
EP1585901B1 (de) 2008-07-23
CN1738974A (zh) 2006-02-22
EP1585901A1 (de) 2005-10-19
FR2849906A1 (fr) 2004-07-16
AU2003299425A1 (en) 2004-08-30
ATE402341T1 (de) 2008-08-15
JP2006513360A (ja) 2006-04-20
WO2004070206A1 (fr) 2004-08-19
FR2849906B1 (fr) 2006-06-30
DE60322435D1 (de) 2008-09-04

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Owner name: L'AIR LIQUIDE, SOCIETE ANONYME A DIRECTOIRE ET CON

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:PANCRAZI, FRANCOIS;LAROYE, STEPHANE;REEL/FRAME:017306/0455

Effective date: 20050616

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION