FR2839755A1 - INSTALLATION FOR PRODUCING A COMPRESSED GAS, AND METHOD FOR OPERATING THE SAME - Google Patents
INSTALLATION FOR PRODUCING A COMPRESSED GAS, AND METHOD FOR OPERATING THE SAME Download PDFInfo
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- FR2839755A1 FR2839755A1 FR0205906A FR0205906A FR2839755A1 FR 2839755 A1 FR2839755 A1 FR 2839755A1 FR 0205906 A FR0205906 A FR 0205906A FR 0205906 A FR0205906 A FR 0205906A FR 2839755 A1 FR2839755 A1 FR 2839755A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/02—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for several pumps connected in series or in parallel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/56—Number of pump/machine units in operation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
Cette installation de production d'un gaz comprimé comprend trois compresseurs (4, 6, 8) reliés à un réseau de gaz comprimé (12, 20), pour chacun des compresseurs (4, 6, 8), une première ligne de connexion (26, 28, 30) à une source d'énergie (24) ainsi qu'un interrupteur (32, 34, 36) de cette ligne, et un variateur de vitesse (VAR) adapté pour faire varier la vitesse de rotation d'un des compresseurs (4, 6, 8), et connecté à la source d'énergie (24). L'installation comprend en outre des interrupteurs (46, 48, 50) adaptés pour connecter de façon sélective un seul des compresseurs (4, 6, 8) au variateur de vitesse (VAR). Chaque compresseur (4, 6, 8) est un compresseur dont la vitesse de rotation peut être réglée de façon continue dans une plage de vitesses située entre une vitesse minimale et une vitesse de transition. Application aux installations de production d'air comprimé.This compressed gas production facility comprises three compressors (4, 6, 8) connected to a compressed gas network (12, 20), for each of the compressors (4, 6, 8), a first connection line ( 26, 28, 30) to a power source (24) as well as a switch (32, 34, 36) of this line, and a variable speed drive (VAR) adapted to vary the speed of rotation of a compressors (4, 6, 8), and connected to the power source (24). The installation further comprises switches (46, 48, 50) adapted to selectively connect only one of the compressors (4, 6, 8) to the variable speed drive (VAR). Each compressor (4, 6, 8) is a compressor whose rotation speed can be continuously adjusted in a speed range between a minimum speed and a transition speed. Application to compressed air production facilities.
Description
de reference et le niveau affiche par chaque cylindre.and the level displayed by each cylinder.
l: La presente invention concerne un procede de production de gaz comprime l: The present invention relates to a method for producing compressed gas
ainsi qu'une installation de production de gaz comprime pour sa mise en couvre. as well as a compressed gas production installation for its covering.
Comme installation de production d'air comprime connue, il y a par exemple celle decrite dans ['article intitule: "Air comprime, retour d'experience sur une vente au m3, public dans ENERGIE PLUS, n 224 du 15 avril 1999, periodique de ['Association Technique Energie Environnement. Wile comprend au moins deux compresseurs dont le cote refoulement est relic a un reseau d'air comprime; I'un de ces comp resseu rs au moins est a vitesse fixe et est d imensionne de tel le sorte qutil fonctionne en permanence a 100% de sa capacite; un autre est a vitesse va riable et est regle de telle sorte qu'il fasse ['appoint du debit de gaz demande. Ce dernier compresseur est demarre ou arrete en fonction de la pression constatee dans le reseau d'air. Lorsque ['installation comprend plus de deux compresseurs, As a known compressed air production installation, there is for example that described in the article entitled: "Compressed air, feedback on a sale per m3, public in ENERGIE PLUS, n 224 of April 15, 1999, periodical from the Technical Association for Energy and Environment. Wile 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 dimensioned in such a way that it operates continuously at 100% of its capacity; another is at a speed that is reliable and is regulated so that it makes up for the required gas flow rate. This last compressor is started or stopped according to the pressure found in the air network. When the installation includes more than two compressors,
seul un est a debit variable.only one has variable flow.
Or, dans ce type d'installation, les compresseurs ne vent pas toujours ex ploites a leurs points d'exploitation de consigne; Certains d'entre eux fonctionnent parfois partiellement en marche a vice, notamment lorsque le debit d'air tombe au dessous de la capacite de production d'air du compresseur fixe. II en resulte une consommation in utile d'energie, qu i indu it par consequent u ne augmentation du ratio, consom mation d'ene rgie par metre-cu be de gaz p rod u it (energie specifique) However, in this type of installation, the compressors do not always operate at their set operating points; Some of them sometimes work partially in reverse mode, especially when the air flow falls below the air production capacity of the fixed compressor. This results in an unnecessary consumption of energy, which consequently results in an increase in the ratio, energy consumption per meter-cu of gas produced (specific energy)
2 o et done une augmentation du prix de revient de ce metre-cube. 2 o and therefore an increase in the cost price of this cubic meter.
De plus, ce type d'installation ne peut pas etre exploite de fa,con economi In addition, this type of installation cannot be operated in an economical manner.
que sur une large plage de debits de gaz. than over a wide range of gas flows.
Enfin, certains des compresseurs vent plus souvent defectueux que d'autres. La presente invention a pour but de pallier les inconvenients cites, et de proposer une installation de fourniture de gaz comprime qui soit economique, no tamment en ce qui concerne la consommation energetique. Un autre but est une Finally, some of the compressors are more often defective than others. The present invention aims to overcome the drawbacks mentioned, and to provide a compressed gas supply installation which is economical, in particular with regard to energy consumption. Another goal is a
installation de fourniture de gaz comprime qui ait un falble cout d'entretien. compressed gas supply system which has a low maintenance cost.
Dans le cadre de ses recherches pour atteindre les objectifs precites, la 3 o demanderesse s'est aper,cue que de fa,con inattendue, on pouvait ameliorer signi ficativement l'energie specifique globale d'une installation de compresseurs par la As part of its research to achieve the above objectives, the 3rd applicant has realized that unexpectedly, it was possible to significantly improve the overall specific energy of a compressor installation by
mise en oeuvre du dispositif expose ci-apres. implementation of the device set out below.
C'est pourquoi selon un premier aspect, I'invention a pour objet, une instal lation de production d'un fluide comprime, comprenant: - n compresseurs dont le cote de refoulement est relic a un reseau de fluide comprime, n etant superieur ou egal a 2 - pour chacun des compresseurs, une premiere ligne de connexion avec un interrupteur permettant de fagon individuelle, I'etablissement ou ['interruption de la connexion du compresseur en direct a la source d'energie, - un variateur de vitesse, adapte pour faire varier de fac,on continue la vi tesse de rotation d'un des compresseurs en fonction d'une consigne de vitesse, et destine a etre connecte a la source d'energie, - pour chacun des compresseurs, une deuxieme ligne de connexion avec un interrupteur permettant de fa,con individuelle, I'etablissement ou ['interruption de la connexion du compresseur, via le variateur de vitesse, a la source d'energie, caracterisee en ce qu'elle comprend: - des moyens formant commutateur, adaptes pour connecter de fa,con se lective, un et un seul des compresseurs au variateur de vitesse, et assurer les phases de transitions entre connexion directe et connexion via variateur, et en ce que: lesdits moyens formant commutateur vent adaptes pour que l'un au l'autre 2 0 des n compresseurs soit connecte audit variateur, - les compresseurs mis en oeuvre dans ['installation objet de la presente in vention vent de preference de type "tout - ou - rien". Par compresseur de type tout - ou rien, on designe priricipalement, les compresseurs du commerce classes This is why, according to a first aspect, the subject of the invention is an installation for producing a compressed fluid, comprising: - n compressors, the discharge side of which is connected to a network of compressed fluid, n being greater than or equal to 2 - for each compressor, a first connection line with a switch allowing, individually, the establishment or [interruption of the connection of the compressor directly to the energy source, - a variable speed drive, suitable in order to vary this, the rotation speed of one of the compressors is continued as a function of a speed setpoint, and intended to be connected to the energy source, - for each of the compressors, a second connection line with a switch enabling, individually, the establishment or interruption of the connection of the compressor, via the variable speed drive, to the energy source, characterized in that it comprises: - means forming a switch, suitable for connec ter fa, con se lective, one and only one of the compressors to the variable speed drive, and ensuring the transition phases between direct connection and connection via variator, and in that: said wind switch means suitable for one at the other 2 0 of the n compressors is connected to said variator, - the compressors used in the installation object of the present invention is preferably of the "all - or - nothing" type. By compressor of the all - or nothing type, we mainly designate commercial class compressors
dans cette categoric et plus particulierement les compresseurs a vis. in this category and more particularly screw compressors.
L'invention a notamment pour objet une installation telle que definie ci dessus, dans laquelle les compresseurs vent des compresseurs a vis dont la vi tesse de rotation peut etre reglee de fa,con continue dans une premiere plage de vitesses situee entre une vitesse minimale et une vitesse de transition superieure The subject of the invention is in particular an installation as defined above, in which the air compressors are screw compressors, the rotational speed of which can be adjusted continuously, in a first speed range situated between a minimum speed and higher transition speed
a la vitesse minimale.at minimum speed.
Par fluide comprime, on entend un fluide dont la pression totale est supe rieure a une atmosphere et plus particulierement: I'air, I'oxygene (02), I'azote (N2), I'argon (Ar), le dioxyde de carbone (CO2), le monoxyde de carbone (CO), I'helium (He), le protoxyde d'azote (N20), le monoxyde d'azote (NO), les melanges de pro toxyde d'azote et d'oxygene, de dioxyde de carbone et d'oxygene, d'azote et de monoxyde de carbone, d'helium et d'oxygene, tels que par exemple, les melanges (50% en volume (v/v) N2O + 50 % v/v 02), (5% v/v CO2, 95 % v/v 02), (200 a 800 ppm NO dans N2), (78 % He + 22% v/v 02), (65 % He + 35 % 02) 80% v/v He + 20 % v/v 02), les melanges d'azote et de dioxyde de carbone ou en encore les gaz By compressed fluid is meant a fluid whose total pressure is greater than one atmosphere and more particularly: air, oxygen (02), nitrogen (N2), argon (Ar), dioxide carbon (CO2), carbon monoxide (CO), helium (He), nitrous oxide (N20), nitrogen monoxide (NO), mixtures of pro-nitrogen oxide and oxygen , carbon dioxide and oxygen, nitrogen and carbon monoxide, helium and oxygen, such as, for example, mixtures (50% by volume (v / v) N2O + 50% v / v 02), (5% v / v CO2, 95% v / v 02), (200 to 800 ppm NO in N2), (78% He + 22% v / v 02), (65% He + 35% 02) 80% v / v He + 20% v / v 02), mixtures of nitrogen and carbon dioxide or even gases
frigorigenes des stations de froid ou la vapeur d'eau. refrigerants from cold stations or water vapor.
Selon un premier aspect particulier de la presente invention, I'installation According to a first particular aspect of the present invention, the installation
telle que definie precedemment, est une installation de production d'air comprime. as defined above, is a compressed air production installation.
Selon un deuxieme aspect particulier de la presente invention, I'installation According to a second particular aspect of the present invention, the installation
telle que definie precedemment, comprend de deux a six compresseurs. as defined above, includes two to six compressors.
Selon un troisieme aspect particulier de la presente invention, I'installation telle que definie precedemment, comprend des moyens adaptes pour demarrer l'un apres l'autre les compresseurs via le variateur de vitesse et pour arreter le compresseur connecte au variateur de vitesse, lorsque la consigne de vitesse du compresseur est situee dans une plage de vitesses delimitee par la vitesse 0 et la vitesse minimale superieure a 0, et adaptes pour exploiter ce compresseur avec la consigne de vitesse lorsque cette consigne de vitesse est superieure a la vitesse minimale. Selon un quatrieme aspect particulier de la presente invention, I'installation 2 o telle que definie precedemment, comprend un capteur de pression de gaz adapte pour mesurer la pression de gaz regnant dans le reseau de gaz comprime, et des moyens de commande adaptes pour commander les interrupteurs et les moyens formant commutateur en fonction de la pression de gaz mesuree par le capteur de pression. 2 5 Selon ce dernier aspect particulier, les moyens de commande comprennent tout particulierement des moyens de regulation de la consigne de vitesse en continu selon une loi de regulation, notamment une loi proportionnelle, integrale, differentielle (PID; en anglais Proportional, Integral Differential), eVou ils vent tout particulierement relies a des moyens de commutation des moyens formant com mutateur, ainsi qu'a des moyens d'actionnement individual de chacun des inter rupteurs. Dans ce cas, les moyens de commande comprennent des moyens de branchement exclusif qui vent adaptes pour connecter un compresseur determine au variateur de vitesse uniquement lorsque l'interrupteur associe a ce compres seur est ouvert et/ou les moyens de commande comprennent tout particulierement According to a third particular aspect of the present invention, the installation as defined above, comprises means suitable for starting the compressors one after the other via the speed controller and for stopping the compressor connected to the speed controller, when the speed reference of the compressor is located in a speed range delimited by speed 0 and the minimum speed greater than 0, and suitable for operating this compressor with the speed reference when this speed reference is greater than the minimum speed. According to a fourth particular aspect of the present invention, the installation 2 o as defined above, comprises a gas pressure sensor suitable for measuring the gas pressure prevailing in the compressed gas network, and control means suitable for controlling the switches and the means forming a switch as a function of the gas pressure measured by the pressure sensor. 2 5 According to this last particular aspect, the control means very particularly comprise means for regulating the speed setpoint continuously according to a regulation law, in particular a proportional, integral, differential law (PID; in English Proportional, Integral Differential). , eVou they wind very particularly connected to means for switching means forming com mutator, as well as to individual actuation means of each of the switches. In this case, the control means comprise exclusive connection means which are suitable for connecting a specific compressor to the variable speed drive only when the switch associated with this compressor is open and / or the control means include in particular
des moyens de selection pour selectionner un des compresseurs devant etre de- selection means for selecting one of the compressors to be de-
marre ou arrete, ces moyens de selection comprenant un compteur adapte pour compter le nombre de demarrages de chacun des compresseurs, et des moyens adaptes pour selectionner comme compresseur devant etre demarre, le compres- seur qui a le moins de temps de fonctionnement ou comme compresseur devant fed up or stopped, these selection means comprising a counter adapted to count the number of starts of each of the compressors, and means adapted to select as compressor to be started, the compressor which has the least operating time or as compressor in front of
etre arrete, le compresseur qui a le plus grand temps de fonctionnement. be stopped, the compressor with the longest operating time.
Selon un mode prefere de cet aspect particulier les moyens de commandes comprennent un automate programmable caracterise en ce qu'il comprend une unite centrale, une memoire et eventuellement des moyens permettant son According to a preferred mode of this particular aspect, the control means comprise a programmable automaton characterized in that it comprises a central unit, a memory and possibly means allowing its
controle a distance et q u ' i l est apte a fonction ner au moyen d' u n prog ram me adap- remote control and that it is able to function by means of a suitable prog ram
te pour reguler le variateur de vitesse en mode de regulation PID. te to regulate the variable speed drive in PID regulation mode.
Selon un cinquieme aspect particulier de la presente invention, I'installation telle que definie precedemment, les compresseurs vent relies en paralleles par According to a fifth particular aspect of the present invention, the installation as defined above, the wind compressors connected in parallel by
leur cote de refoulement, a un reservoir tampon de fluide comprime par 1'interme- their discharge side, to a buffer reservoir of fluid compressed by means of
diaire d'une premiere conduite de liaison, ledit reservoir tampon etant relic au re- diary of a first connecting pipe, said buffer tank being connected to the
seau de fluide comprime par une seconde conduite de liaison munie d'une vanne bucket of fluid compressed by a second connecting line fitted with a valve
de coupure. La premiere conduite de liaison est de preference munie d'un filtre. cutoff. The first connecting pipe is preferably provided with a filter.
L'invention a aussi pour objet un procede de production d'un fluide compri me mettant en couvre 1 'installation tel le q ue defin ie precedemment, caracterise en ce qu'il comprend au cours du temps, I'une ou l'autre des etapes fonctionnement suivantes: - lorsque la pression du fluide dans le reseau de fluide comprime en aval de ladite installation est situee dans une plage de valeur comprise entre un seuil de The invention also relates to a process for the production of a compressed fluid covering me the installation such as q ue defined previously, characterized in that it comprises over time, one or the other of the following operating steps: - when the pressure of the fluid in the compressed fluid network downstream of said installation is situated in a value range between a threshold of
pression haute (designee ci-apres par: PSH) et un seuil de pression basse (desi- high pressure (hereinafter referred to as: PSH) and a low pressure threshold (desi-
gnee ci-apres par: PSL), la pression du fluide dans ledit reseau est maintenue gnee hereafter by: PSL), the pressure of the fluid in said network is maintained
dans cette plage de valeur au moyen du compresseur connecte au variateur de vi- in this value range by means of the compressor connects to the speed variator
tesse; - lorsque la pression du fluide dans ledit reseau devient inferieure a PSL pendant une duree predeterminee, soit le compresseur connecte au variateur de vitesse est arrete, et il est dans ce cas, demarre a la vitesse minimale; soit le hostess; - when the pressure of the fluid in said network becomes lower than PSL for a predetermined duration, either the compressor connected to the variable speed drive is stopped, and it is in this case, started at the minimum speed; be the
compresseur connecte au variateur de vitesse est exploite a une vitesse supe- compressor connected to the variable speed drive is operated at a higher speed
rieure ou egale a la vitesse minimale et inferieure a la vitesse maximale, et dans ce cas sa vitesse est portee a la vitesse maximale, sot le compresseur connecte higher or equal to the minimum speed and lower than the maximum speed, and in this case its speed is brought to the maximum speed, if the compressor is connected
au variateur de vitesse est exploite a la vitesse maximale et dans ce cas, si l'inter- the speed controller is operated at maximum speed and in this case, if the inter-
rupteur de connexion directe d'au moins un des compresseurs est ouvert, les moyens formant commutateur, connectent un autre compresseur dont I'interrupteur est ouvert au variateur de vitesse et l'interrupteur de connexion di- recte du compresseur qui etait precedemment connecte au variateur est ferme; - lorsque la pression de fluide dans ledit reseau devient superieure a PSH pendant une duree predeterminee, soit le compresseur connecte au variateur de vitesse est exploite au-dessus de la vitesse minimale, et il est dans ce cas, ralenti a la vitesse minimale, sot le compresseur connecte au variateur de vitesse est exploite a la vitesse minimale, et dans ce cas il est arrete, soit le compresseur connecte au variateur de vitesse est arrete et si l'interrupteur de connexion directe direct connection breaker of at least one of the compressors is open, the switch means connect another compressor, the switch of which is open to the speed controller and the direct connection switch of the compressor which was previously connected to the variator is closed; - when the fluid pressure in said network becomes greater than PSH for a predetermined period, either the compressor connected to the speed controller is operated above the minimum speed, and in this case it is slowed down to the minimum speed, sot the compressor connected to the speed controller is operated at minimum speed, and in this case it is stopped, either the compressor connected to the speed controller is stopped and if the direct connection switch
d'au moins un des compresseurs est ferme, il dans ce cas ouvert. at least one of the compressors is closed, in this case open.
Selon un autre aspect particulier du procede tel que defini ci-dessus, il According to another particular aspect of the method as defined above, it
comprend prealablement a la connexion du variateur de vitesse a l'un des com- includes before connecting the frequency converter to one of the
presseurs, une etape de selection audit compresseur, par laquelle le compresseur pressers, a selection step to said compressor, by which the compressor
choisi est celui qui a fonctionne le moins longtemps au cours du temps. chosen is the one that has operated the least time over time.
Selon un dernier aspect particulier du procede tel que decrit precedem- According to a last particular aspect of the process as described above.
ment, il comprend, prealablement a l'arret d'un compresseur en connexion directe, ment, it includes, before stopping a compressor in direct connection,
2 o une etape de selection du compresseur a arreter, par laquelle le compresseur se- 2 o a step for selecting the compressor to be stopped, by which the compressor
lectionne est celui qui a fonctionne le plus longtemps au cours du temps. The one that has worked the longest over time.
Le procede tel que decrit precedemment est particulierement adapte a la The process as described above is particularly suitable for
production d'air comprime.compressed air production.
L'invention sera mieux comprise a la lecture de la description qui va suivre, The invention will be better understood on reading the description which follows,
2 5 donnee uniquement a titre d'exemple et faite en se referent aux dessins annexes, sur lesquels: - la Figure 1 est une vue schematique d'une installation de production de gaz comprime selon ['invention; et - les Figures 2A et 2B vent des diagrammes montrant les allures de la pres 2 5 given solely by way of example and made with reference to the accompanying drawings, in which: - Figure 1 is a schematic view of a compressed gas production installation according to the invention; and - Figures 2A and 2B are diagrams showing the paces of the pres
sion de gaz dans le temps et la regulation correspondante d'un compresseur. gas over time and the corresponding regulation of a compressor.
Cette installation 2 comprend trots compresseurs 4, 6, 8 qui vent relies en parallele a ['entree 10 d'un reservoir tampon 12 de gaz comprime par l'intermediaire d'une premiere conduite de liaison 14 munie d'un filtre 16. Une sor tie 18 du reservoir tampon 12 est reliee a un reseau d'utilisateur d'air comprime (non represente) par l'intermediaire d'une seconde conduite de liaison 20 munie This installation 2 comprises compressor trots 4, 6, 8 which are connected in parallel to the inlet 10 of a buffer tank 12 of compressed gas by means of a first connecting pipe 14 provided with a filter 16. A outlet 18 of buffer tank 12 is connected to a compressed air user network (not shown) by means of a second connecting pipe 20 provided
d'une vanne de coupure 22.a cutoff valve 22.
Les compresseurs 4, 6, 8 vent des compresseurs a vis lubrifiee. Ce type de compresseur permet une exploitation dans une certaine plage de vitesses de rota tion. Dans cette plage, la vitesse de rotation peut etre reglee de fa,con continue. La plage est delimitee par une vitesse de rotation maximale FMAX, 100% et une vi tesse de rotation minimale FMIN, differente de 0, qui steleve par exemple a 50% de la vitesse de rotation maxi male FMAX. Exceptionnel lement, les compresseu rs 4, 6, 8 peuvent etre exploitee, pour une course duree, a une vitesse variable ega lement en continu jusquta une vitesse de transition FTRA, superieure a la vitesse Compressors 4, 6, 8 use lubricated screw compressors. This type of compressor allows operation within a certain range of rotational speeds. Within this range, the rotational speed can be continuously adjusted. The range is delimited by a maximum speed of rotation FMAX, 100% and a minimum speed of rotation FMIN, other than 0, which stands for example at 50% of the maximum speed of rotation FMAX. Exceptionally, compressors 4, 6, 8 can be operated, for a long stroke, at a variable speed also continuously up to a transition speed FTRA, higher than the speed
maximale FMAX.maximum FMAX.
Au-dessous de la vitesse minimale FMIN, le compresseur 4, 6 ou 8 consi dere doit etre arrete, etant donne que la lubrification de la vis est insuffisante dans cette plage de vitesses de rotation. Le debit d'air comprime est sensiblement di rectement proportionnel a la vitesse de rotation. De tels compresseurs vent par exemple des compresseurs du type DSD 201/7,5 bars commercialises par la so Below the minimum FMIN speed, the compressor 4, 6 or 8 considered must be stopped, since the lubrication of the screw is insufficient in this range of rotational speeds. The compressed air flow is substantially directly proportional to the speed of rotation. Such compressors are sold, for example, DSD 201 / 7.5 bar type compressors sold by the so
ciete KAESER.ciete KAESER.
L'installation 2 comprend en outre une source d'energie electrique, en The installation 2 further comprises a source of electrical energy, in
['occurrence une source de courant de puissance triphase 24. [occurrence of a three-phase power source 24.
L'installation 2 comprend trots premieres lignes 26, 28, 30 de connexion a trots firs. Chacune des premieres lignes de connexion 26, 28, 30 relic l'un des The installation 2 comprises trots first lines 26, 28, 30 of connection to trots firs. Each of the first connection lines 26, 28, 30 connects one of the
compresseurs 4, 6, 8 a la source de courant 24. compressors 4, 6, 8 at current source 24.
Chacune des premieres lignes de connexion 26, 28, 30 est munie d'un premier interrupteur 32, 34, 36 permettant un etablissement ou une interruption individuelle de la liaison entre les compresseurs 4, 6, 8 et la source de courant 24. L'installation 2 comprend en outre un variateur de vitesse VAR relic a la source de courant 24 par une deuxieme ligne de connexion 44 a trots firs. Le variateur de vitesse est adapte pour generer un courant de puissance dont la fre quence determine la vitesse de rotation d'un compresseur 4, 6, 8 connecte a ce variateur VAR. Le variateur de vitesse VAR est par exemple un variateur du type Each of the first connection lines 26, 28, 30 is provided with a first switch 32, 34, 36 allowing an individual establishment or interruption of the connection between the compressors 4, 6, 8 and the current source 24. The installation 2 also includes a VAR variable speed drive connected to the current source 24 by a second connection line 44 with three steps. The variable speed drive is adapted to generate a power current whose frequency determines the speed of rotation of a compressor 4, 6, 8 connected to this VAR variator. The VAR variable speed drive is for example a variator of the type
ATV-68 commercialise par la societe SCHNEIDER. ATV-68 sold by the SCHNEIDER company.
L'installation 2 comprend trots seconds interrupteurs 46, 48, 50, et une troi sieme ligne de connexion 52 a trots firs. La ligne de connexion 52 se subdivise en trots branches 52A, 52B, 52C, dont chacune relic le variateur de vitesse VAR a l'un des compresseurs 4, 6, 8, en parallele aux premieres lignes de connexion 26, 28, 30. Chacun des seconds interrupteurs 46, 48, 50 est interpose dans 1'une des Installation 2 includes three second switches 46, 48, 50, and a third connection line 52 with three steps. The connection line 52 is subdivided into trot branches 52A, 52B, 52C, each of which connects the variable speed drive VAR to one of the compressors 4, 6, 8, in parallel with the first connection lines 26, 28, 30. Each second switches 46, 48, 50 is interposed in one of the
branches 52A, 52B, 52C.branches 52A, 52B, 52C.
Chacun des compresseurs 4, 6, 8 peut done etre connecte individuellement Each of the compressors 4, 6, 8 can therefore be connected individually
au variateur de vitesse VAR.to the VAR variable speed drive.
Un capteur de pression 54 du gaz est dispose en aval des compresseurs 4, A gas pressure sensor 54 is located downstream of the compressors 4,
6, 8 dans le reseau de gaz, par exemple dans le reservoir tampon 12. 6, 8 in the gas network, for example in the buffer tank 12.
L'installation 12 comprend en outre un dispositif de commande, en The installation 12 further comprises a control device, in
I'occurrence un automate programmable CMD. The occurrence of a CMD programmable controller.
Ce dispositif de commande CMD comprend une entree 56 qui est reliee au capteur de pression 54 par une ligne de capteur 58, afin de constater la pression This CMD control device comprises an inlet 56 which is connected to the pressure sensor 54 by a sensor line 58, in order to observe the pressure
de gaz P etablie dans le reseau de gaz. gas P established in the gas network.
La commande CMD comprend en outre trots sorties 60, 62, 64 qui vent re liees a des premiere 66, deuxieme 68 et troisieme 70 lignes de commande des premiers interrupteurs 32, 34, 36, et trots sorties 72A, 72B, 72C qui vent reliees a des premiere 74A, deuxibme 74B et troisieme 74C lignes de commande des se conds interrupteurs 46, 48, 50. Une autre sortie 76 de la commande CMD est re liee a une ligne de commande 78 du variateur VAR. Les seconds interrupteurs 46, 48, 50 forment des moyens de commutation par lesquels 1'un des compresseurs The CMD command also includes output trots 60, 62, 64 which are linked to first 66, second 68 and third 70 control lines for the first switches 32, 34, 36, and output trots 72A, 72B, 72C which are connected first 74A, second 74B and third 74C control lines of the following switches 46, 48, 50. Another output 76 of the CMD command is linked to a command line 78 of the variator VAR. The second switches 46, 48, 50 form switching means by which one of the compressors
peut etre connecte au variateur de vitesse VAR. can be connected to the VAR variable speed drive.
Les sorties 60, 62, 64, 72A, 72B, 72C et les lignes de commande associees 66, 68, 70, 74A, 74B, 74C vent adaptees pour ouvrir ou fermer les interrupteurs 32, 34, 36, 46, 48, 50. La sortie 76 et la ligne de commande 78 vent adaptees So pour regler la frequence de sortie du variateur VAR. Les sorties 60, 62, 64, 72A, 72B, 72C, 76 vent asservies par une unite centrale CPU de la commande CMD en fonction de la pression de gaz P. Outre ['unite centrale CPU, I'automate programmable CMD comprend une memoire MEM dans laquelle vent stockes les seuils de pression haute PSH et Outputs 60, 62, 64, 72A, 72B, 72C and the associated control lines 66, 68, 70, 74A, 74B, 74C are suitable for opening or closing switches 32, 34, 36, 46, 48, 50. The output 76 and the control line 78 are adapted to So to adjust the output frequency of the VAR drive. The outputs 60, 62, 64, 72A, 72B, 72C, 76 wind controlled by a central unit CPU of the CMD control according to the gas pressure P. In addition to the central unit CPU, the programmable controller CMD includes a memory MEM in which wind stores the high pressure thresholds PSH and
pression basse PSL, et un programme PRG de commande de ['installation. low pressure PSL, and a PRG program for controlling the installation.
De plus, la memoire MEM stocke, pour chacun des compresseurs 4, 6, 8, le temps total de fonctionnement du compresseur 4, 6, 8 associe. In addition, the MEM memory stores, for each of the compressors 4, 6, 8, the total operating time of the associated compressor 4, 6, 8.
Le programme PRG est adapte pour reguler le variateur de vitesse VAR se- The PRG program is adapted to regulate the VAR variable speed drive
lon une loi de regulation, en ['occurrence en mode de regulation PID lorsque la pression P constatee se trouve entre les deux seuils de pressions PSH et PSL. Le mode PID fait varier la frequence de sortie du variateur en fonction de l'integrale et There is a regulation law, in this case in PID regulation mode when the pressure P observed is between the two pressure thresholds PSH and PSL. PID mode varies the output frequency of the drive according to the integral and
de la derivee de l'ecart entre la valeur reelle et la valeur de consigne sur un inter- of the difference between the actual value and the set value on an inter-
valle de temps predetermine.valley of predetermined time.
Le dispositif de commande CMD comprend en outre des moyens pour se- The CMD control device further comprises means for
lectionner parmi les compresseurs dont le premier interrupteur 32, 34, 36 est ou- select from the compressors whose first switch 32, 34, 36 is ou-
vert et qui n'est pas connecte au variateur VAR, un compresseur 4, 6, 8 devant green and not connected to the VAR drive, a compressor 4, 6, 8 in front
etre connecte au variateur de vitesse VAR suivant la condition suivante. be connected to the VAR variable speed drive according to the following condition.
Le compresseur qui a le moins de temps total de fonctionnement. The compressor with the least total operating time.
Le programme PRG mis en oeuvre dans la commande CMD controle les premiers interrupteurs 32, 34, 36 et les seconds interrupteurs 46, 48, 50 selon un mode de branchement exclusif. Ce mode ne permet pas la fermeture de l'un des seconds interrupteurs d'un compresseur determine 4, 6, 8, que lorsque le premier The PRG program implemented in the CMD command controls the first switches 32, 34, 36 and the second switches 46, 48, 50 according to an exclusive connection mode. This mode does not allow the closing of one of the second switches of a determined compressor 4, 6, 8, until the first
interrupteur 32, 34, 36, associe a ce compresseur est ouvert. switch 32, 34, 36, associated with this compressor is open.
Par ailleurs, ce mode ne permet pas la fermeture de l'un des seconds inter- Furthermore, this mode does not allow the closing of one of the second inter-
rupteurs 46, 48, 50 que si tous les seconds interrupteurs 46, 48, 50 vent ouverts. breakers 46, 48, 50 only if all the second switches 46, 48, 50 are open.
La commande CMD est en outre munie de moyens de detection d'une de The CMD control is furthermore provided with means for detecting one of
2 5 faillance de l'un des composants de ['installation 2. 2 5 bankruptcy of one of the components of the installation 2.
Ces moyens vent connectes a une ligne telephonique 80 afin d'avertir le These means are connected to a telephone line 80 in order to warn the
personnel de maintenance dans le cas d'une defaillance. maintenance personnel in the event of a failure.
Les Figures 2A et 2B representent un exemple des allures dans le temps de la pression P regnant dans le reseau d'air ainsi que de la variation de la vitesse Figures 2A and 2B show an example of the patterns over time of the pressure P prevailing in the air network as well as of the variation of the speed.
de rotation d'un compresseur pendant l/exploitation de ['installation. rotation of a compressor during operation of the installation.
Les abscisses des deux diagrammes representent le temps ecoule pendant The abscissas of the two diagrams represent the time elapsed during
quinze phases I a XV, qui ne vent pas representees a l'echelle. fifteen phases I to XV, which are not represented on the scale.
Les ordonnees du diagramme 2A montrent la pression P etablie dans le re- The ordinates of diagram 2A show the pressure P established in the re-
seau d'air et constatee par le capteur de pression 54. air bucket and noted by the pressure sensor 54.
Les ordonnees du diagramme 2B indiquent la vitesse de rotation du com- The ordinates of diagram 2B indicate the rotational speed of the
presseur. Sur l'axe des ordonnees vent marquees les trots vitesses determinantes du compresseur, a savoir, la vitesse minimale FMIN (50%), la vitesse maximale presser. On the axis of the wind ordinates marked the three determining speeds of the compressor, namely, the minimum speed FMIN (50%), the maximum speed
(100%), ainsi que la vitesse de transition FTRA (120%). (100%), as well as the FTRA transition speed (120%).
Pendant la phase 1, le compresseur est connecte au variateur de vitesse During phase 1, the compressor is connected to the variable speed drive
VAR et est exploite en regulation PID. En raison de la variation du debit d'air com- VAR and is operated under PID regulation. Due to the variation in the air flow
prime, la vitesse de rotation du compresseur variable est reglee a l'interieur de la plage situee entre la vitesse minimale FMIN et la vitesse maximale FMAX, de prime, the rotation speed of the variable compressor is adjusted within the range between the minimum speed FMIN and the maximum speed FMAX, from
sorte que la pression P reste sensiblement la pression de consigne PREG. so that the pressure P remains substantially the set pressure PREG.
Au debut de la phase 11, la demande d'air comprime chute de sorte que le At the start of phase 11, the air demand compresses, so that the
compresseur variable soit amene a sa vitesse minimale FMIN lors de cette phase. variable compressor is brought to its minimum FMIN speed during this phase.
Comme le debit d'air reste falble, la pression P monte, lors de la phase 111. As the air flow remains falble, the pressure P rises during phase 111.
A la fin de la phase 111 1a pression P atteint le seuil de pression haute PSH. Apres At the end of phase 111, the pressure P reaches the high pressure threshold PSH. After
l'ecoulement du temps T5 (phase IV), pendant laquelle la pression P reste au- the passage of time T5 (phase IV), during which the pressure P remains above
dessus de PSH, le compresseur est arrete. above PSH, the compressor is stopped.
Pendant la phase V, en raison de la diminution du debit de gaz produit, la pression P tombe jusqu'au seuil de pression basse PSL, et y reste pendant un During phase V, due to the decrease in the gas flow produced, the pressure P falls to the low pressure threshold PSL, and remains there for a
temps T6 (phase Vl), suffisant pour que la commande CMD redemarre le com- time T6 (phase Vl), sufficient for the CMD command to restart the
presseur avec la vitesse minimale FMIN, a la suite de quoi la pression P monte de presser with minimum speed FMIN, after which the pressure P rises
nouveau jusqu'au seuil de pression haute PSH (phase Vll), et franchit cette pres- again up to the high pressure threshold PSH (phase Vll), and crosses this pressure
sion. La pression P reste au-dessus du seuil de pression haute PSH et apres un temps T4 (phase V111), suffisant pour que le compresseur variable soit de nouveau if we. The pressure P remains above the high pressure threshold PSH and after a time T4 (phase V111), sufficient for the variable compressor to be again
2 5 arrete, le compresseur variable est alors arrete. 2 5 stopped, the variable compressor is then stopped.
Pendant la phase IX, la pression P tombe au-dessous du seuil de pression haute PSH avant l'ecou lement d u temps T7, pu is au-dessous de PS L. Pendant la During phase IX, the pressure P falls below the high pressure threshold PSH before the lapse of time T7, then is below PS L. During the
phase X, qui cure le temps T6, la pression P reste au-dessous du seuil de pres- phase X, which cures time T6, the pressure P remains below the pressure threshold
sion basse PSL et, en consequence, le compresseur est mis en route a sa vitesse PSL low pressure and, consequently, the compressor is started at its speed
3 0 FMIN.3 0 FMIN.
En raison d'une demande importante de gaz, la pression P reste au- Due to a large demand for gas, the pressure P remains
dessous du seuil de pression basse PSL pendant le temps T3 (phase Xl), et le below the low pressure threshold PSL during time T3 (phase Xl), and the
compresseur est regle en mode continu PID (phase Xl l) jusqu'a sa vitesse maxi- compressor is set in continuous PID mode (phase Xl l) up to its maximum speed
male FMAX.male FMAX.
La pression reste neanmoins au-dessous du seuil de pression basse PSL et apres le delai T1 (phase X111), lors de la phase XIV, la commande CMD aug mente la vitesse du compresseur jusqu'a la vitesse de transition FTRA, decon- necte ce compresseur du variateur (point DC) et ferme l'interrupteur 32, 34, 36 correspondent. A partir de la fin de la phase XIV, le compresseur est exploite en mode fixe a la vitesse FMAX. Simultanement a la fermeture de l'interrupteur du compresseur, la consigne de vitesse du variateur VAR est amenee a 0, puis un autre compresseur est selectionne et est branche sur le variateur. Ensuite, ce compresseur est demarre a la vitesse FMIN. Ainsi, le debit d'air comprime produit The pressure nevertheless remains below the low pressure threshold PSL and after the delay T1 (phase X111), during phase XIV, the CMD command increases the speed of the compressor up to the transition speed FTRA, disconnected this variator compressor (DC point) and closes the switch 32, 34, 36 correspond. From the end of phase XIV, the compressor is operated in fixed mode at FMAX speed. Simultaneously with the closing of the compressor switch, the speed reference of the VAR variator is brought to 0, then another compressor is selected and is connected to the variator. Then, this compressor is started at FMIN speed. Thus, the air flow compresses product
est augmente, et en consequence, la pression P augmente. is increased, and consequently, the pressure P increases.
A lissue de ['experience decrite ci-dessous, on a constate que ['installation selon ['invention permettait d'economiser environ 15 % d'energie par rapport a une At the end of the experiment described below, it was found that the installation according to the invention made it possible to save around 15% of energy compared to a
installation de 1'etat de la technique. installation of the state of the art.
L'energie specifique est plus faible sur une large plage de debits de gaz. De The specific energy is lower over a wide range of gas flows. Of
plus, cette regulation conduit a un nombre falble de demarrages/arrets des com- more, this regulation leads to a falble number of starts / stops of the
presseurs, cela reduit ainsi les temps de marche a vice et evite de ce fait les per- pressers, this reduces vice running times and thereby avoids
tes d'energie associees. La duree de vie du compresseur est augmentee et le associated energy. The service life of the compressor is increased and the
2 0 temps d'entretien de 1' installation est redu it. The installation maintenance time is reduced.
D'autre part, I'installation n'utilise qu'un seul variateur de vitesse d'ou un On the other hand, the installation uses only one variable speed drive or one
cout d'investissement falble.investment cost falble.
Grace au procede de selection des compresseurs devant etre arretes ou demarres, les demarrages de compresseurs se font tous avec le variateur et vent repartis de fa,con reguliere sur 1'ensemble des compresseurs, ce qui mene a une Thanks to the selection process of the compressors to be stopped or started, the compressor starts are all done with the variator and the wind is distributed in a uniform manner on all the compressors, which leads to a
usure reguliere de ceux-ci.regular wear of these.
Claims (16)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0205906A FR2839755B1 (en) | 2002-05-14 | 2002-05-14 | COMPRESSOR GAS PRODUCTION FACILITY, AND METHOD OF OPERATING THE SAME |
EP03749908A EP1511938A1 (en) | 2002-05-14 | 2003-04-29 | Compressed gas production installation and operating method thereof |
PCT/FR2003/001339 WO2003095841A1 (en) | 2002-05-14 | 2003-04-29 | Compressed gas production installation and operating method thereof |
AU2003246870A AU2003246870A1 (en) | 2002-05-14 | 2003-04-29 | Compressed gas production installation and operating method thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0205906A FR2839755B1 (en) | 2002-05-14 | 2002-05-14 | COMPRESSOR GAS PRODUCTION FACILITY, AND METHOD OF OPERATING THE SAME |
Publications (2)
Publication Number | Publication Date |
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FR2839755A1 true FR2839755A1 (en) | 2003-11-21 |
FR2839755B1 FR2839755B1 (en) | 2006-02-03 |
Family
ID=29286464
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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FR0205906A Expired - Fee Related FR2839755B1 (en) | 2002-05-14 | 2002-05-14 | COMPRESSOR GAS PRODUCTION FACILITY, AND METHOD OF OPERATING THE SAME |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1511938A1 (en) |
AU (1) | AU2003246870A1 (en) |
FR (1) | FR2839755B1 (en) |
WO (1) | WO2003095841A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008064490A1 (en) * | 2008-12-23 | 2010-06-24 | Kaeser Kompressoren Gmbh | Method for controlling a compressor system |
Citations (10)
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---|---|---|---|---|
US3566147A (en) * | 1967-02-21 | 1971-02-23 | Atlas Copco Ab | Control device for variable sequential connection and disconnection of plant components |
JPS5610667A (en) * | 1979-07-09 | 1981-02-03 | Maekawa Seisakusho Kk | Cooler |
EP0209499A2 (en) * | 1985-06-10 | 1987-01-21 | Institut Cerac S.A. | A compressor plant |
US5522707A (en) * | 1994-11-16 | 1996-06-04 | Metropolitan Industries, Inc. | Variable frequency drive system for fluid delivery system |
US5797729A (en) * | 1996-02-16 | 1998-08-25 | Aspen Systems, Inc. | Controlling multiple variable speed compressors |
JPH11343986A (en) * | 1998-06-02 | 1999-12-14 | Hitachi Ltd | Compressor control device |
US6233954B1 (en) * | 1999-04-28 | 2001-05-22 | Ingersoll-Rand Company | Method for controlling the operation of a compression system having a plurality of compressors |
US6287083B1 (en) * | 1999-04-14 | 2001-09-11 | Hitachi, Ltd. | Compressed air production facility |
US6330804B1 (en) * | 1999-03-10 | 2001-12-18 | Hitachi, Ltd. | Refrigerating unit |
EP1184631A1 (en) * | 2000-08-31 | 2002-03-06 | Carrier Corporation | Method for controlling variable speed drive with multiple chillers |
-
2002
- 2002-05-14 FR FR0205906A patent/FR2839755B1/en not_active Expired - Fee Related
-
2003
- 2003-04-29 WO PCT/FR2003/001339 patent/WO2003095841A1/en not_active Application Discontinuation
- 2003-04-29 AU AU2003246870A patent/AU2003246870A1/en not_active Abandoned
- 2003-04-29 EP EP03749908A patent/EP1511938A1/en not_active Withdrawn
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3566147A (en) * | 1967-02-21 | 1971-02-23 | Atlas Copco Ab | Control device for variable sequential connection and disconnection of plant components |
JPS5610667A (en) * | 1979-07-09 | 1981-02-03 | Maekawa Seisakusho Kk | Cooler |
EP0209499A2 (en) * | 1985-06-10 | 1987-01-21 | Institut Cerac S.A. | A compressor plant |
US5522707A (en) * | 1994-11-16 | 1996-06-04 | Metropolitan Industries, Inc. | Variable frequency drive system for fluid delivery system |
US5797729A (en) * | 1996-02-16 | 1998-08-25 | Aspen Systems, Inc. | Controlling multiple variable speed compressors |
JPH11343986A (en) * | 1998-06-02 | 1999-12-14 | Hitachi Ltd | Compressor control device |
US6330804B1 (en) * | 1999-03-10 | 2001-12-18 | Hitachi, Ltd. | Refrigerating unit |
US6287083B1 (en) * | 1999-04-14 | 2001-09-11 | Hitachi, Ltd. | Compressed air production facility |
US6233954B1 (en) * | 1999-04-28 | 2001-05-22 | Ingersoll-Rand Company | Method for controlling the operation of a compression system having a plurality of compressors |
EP1184631A1 (en) * | 2000-08-31 | 2002-03-06 | Carrier Corporation | Method for controlling variable speed drive with multiple chillers |
Non-Patent Citations (1)
Title |
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PATENT ABSTRACTS OF JAPAN vol. 2000, no. 03 30 March 2000 (2000-03-30) * |
Also Published As
Publication number | Publication date |
---|---|
WO2003095841A1 (en) | 2003-11-20 |
FR2839755B1 (en) | 2006-02-03 |
EP1511938A1 (en) | 2005-03-09 |
AU2003246870A1 (en) | 2003-11-11 |
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