EP0376823B1 - Verfahren und Vorrichtung zur Mengenstromregelung von flüssigen CO2 und deren Anwendung für einen Kühltunnel - Google Patents

Verfahren und Vorrichtung zur Mengenstromregelung von flüssigen CO2 und deren Anwendung für einen Kühltunnel Download PDF

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Publication number
EP0376823B1
EP0376823B1 EP89403619A EP89403619A EP0376823B1 EP 0376823 B1 EP0376823 B1 EP 0376823B1 EP 89403619 A EP89403619 A EP 89403619A EP 89403619 A EP89403619 A EP 89403619A EP 0376823 B1 EP0376823 B1 EP 0376823B1
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Prior art keywords
pressure
pipe
valve
liquid
downstream
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English (en)
French (fr)
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EP0376823B2 (de
EP0376823A1 (de
Inventor
Patrick Micheau
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Carboxyque Francaise SA
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Carboxyque Francaise SA
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Application filed by Carboxyque Francaise SA, Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Carboxyque Francaise SA
Priority to AT89403619T priority Critical patent/ATE100921T1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
    • B01F23/2376—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media characterised by the gas being introduced
    • B01F23/23762—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/45—Mixing liquids with liquids; Emulsifying using flow mixing
    • B01F23/451—Mixing liquids with liquids; Emulsifying using flow mixing by injecting one liquid into another
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/48—Mixing liquids with liquids; Emulsifying characterised by the nature of the liquids
    • B01F23/481—Mixing liquids with liquids; Emulsifying characterised by the nature of the liquids using liquefied or cryogenic gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/49—Mixing systems, i.e. flow charts or diagrams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/10—Arrangements for preventing freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F25D29/001—Arrangement or mounting of control or safety devices for cryogenic fluid systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0335—Check-valves or non-return valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0338—Pressure regulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/013—Carbone dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/035—High pressure (>10 bar)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/03—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the pressure level
    • F17C2225/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0114—Propulsion of the fluid with vacuum injectors, e.g. venturi
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0636—Flow or movement of content
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/02—Improving properties related to fluid or fluid transfer
    • F17C2260/024—Improving metering

Definitions

  • the present invention relates to a method and to a device for regulating a flow of liquid C0 2 in a distribution pipe provided with a regulating valve and leading to at least one C0 2 injection station.
  • C0 2 carbon dioxide
  • C0 2 carbon dioxide
  • C0 2 is most often delivered in liquefied form and stored in this form in a tank.
  • the characteristics of the processes require the ability to adapt the flow of C0 2 to the load to be treated; it is therefore necessary to regulate the flow of C0 2 as a function of the characteristic parameters of the process: measurement of the pH in water treatments, measurement of temperature in cryogenic treatments, for example.
  • the regulating method which is theoretically the most precise and economical with regard to the consumption of C0 2 is that of continuously regulating the flow of liquid C0 2 using a pilot valve with variable opening. , controlled by a proportional, derivative and integral regulator.
  • the principle of such a valve is to present a restriction on the flow of the fluid.
  • the section of this restriction is adjusted by means of a shutter element, moving continuously between two extreme positions under the effect of electrical or pneumatic energy.
  • the C0 2 is present upstream of this valve at a pressure close to that of the reservoir, ie 11 to 60 ⁇ 10 5 Pa depending on the case.
  • the section restriction causes, according to the laws of the flow of fluids, a loss of pressure all the more important as the section of passage to the shutter is low.
  • the valve assumes a position close to its complete closure.
  • the cross-sectional restriction is then maximum, and the pressure drop at the passage of the shutter is large enough for the pressure of the C0 2 downstream of the valve to take values less than 5.2 ⁇ 10 5 Pa.
  • This value of 5.2 x 10 5 Pa is the pressure of the triple point of the C0 2 value below which the C0 2 liquid instantly transforms a mixture of C0 2 and gaseous C0 2 solid (dry ice) .
  • control valves which can be used for these processes are such that the small diameter and the tortuous shape of the pipes immediately downstream of the shutter lead to immediate blockage as soon as carbon dioxide snow appears.
  • Document FR-A-2,142,309 describes a device for atomizing liquid C0 2 comprising a line for dispensing liquid C0 2 provided with an all-or-nothing actuation valve, as mentioned above, operating alternately with an all-or-nothing valve a gas supply line for C0 2 supplying, at the outlet of the device, a gaseous stream of pre-pressurization of this outlet.
  • the invention aims to allow in all cases, simply and reliably, the use of a continuously piloted valve.
  • the method according to the invention is characterized in that it maintains, permanently during the whole operation of delivering the flow of C0 2 , at least in the part of the pipe downstream of the valve, until 'near the injection point of C0 2 , an intermediate pressure higher than the pressure of the triple point of C0 2 .
  • the C0 2 gas prior to connecting the dispensing line to a C0 2 liquid reservoir, is injected into this line upstream and downstream of the valve, the C0 2 gas at a pressure between the pressure of the triple point and said intermediate pressure.
  • the invention also relates to a device for regulating a flow of liquid C0 2 for the implementation of such a method.
  • a device comprising a pressurized C0 2 reservoir connected to a liquid C0 2 dispensing line comprising a regulating valve and to a gaseous withdrawal line comprising a pressure reducer and terminating, via a first non-return valve in a downstream part of the draw-off line downstream of the valve, is characterized in that the downstream part of the distribution line leads to at least one diaphragm type overflow carrying a shutter cooperating with an ejection seat, the membrane being biased in the direction closing the valve by an adjustable effect spring.
  • Document GB-A-807.088 describes a device for pressurizing a container with C0 2 prove from a source of liquid C0 2 , the device comprising a shutter cooperating with an orifice for expansion of the liquid C0 2 and coupled to a membrane so as to be kept normally open as long as the gas pressure in the container does not exceed one determined value.
  • the regulating device represented in FIG. 1 is intended to supply a variable flow of C0 2 at an injection point A from a storage tank 2 in which a pressure PS is maintained which is clearly higher than the pressure PT at the point triple C0 2 (5.2 bars), and generally between 11 and 60 bars.
  • Point A is at a determined pressure PO, for example substantially equal to atmospheric pressure, but in any case less than PT.
  • the regulating device 1 comprises a thermally insulated liquid pipe 3 extending from the lower part of the tank 2 to a spillway 4.
  • a pilot valve 5 is interposed in this pipe and defines therein an upstream section 6, of the tank to the valve, and a downstream section 7, from the valve to the spillway.
  • This valve includes a shutter, the position of which can vary continuously between a maximum opening position and a completely closed position, under the action of a motor 8.
  • the latter is controlled by a regulator 9 which receives from a measuring instrument 10 (for example a pH meter or a thermometer) a signal representative of the pilot quantity.
  • a measuring instrument 10 for example a pH meter or a thermometer
  • the overflow valve 4 (FIG. 2) comprises a housing 11 divided into two chambers by a membrane 12.
  • a helical spring 13, the force of which is adjustable by means of a screw 14, is arranged in one of these chambers, while the other chamber (the lower chamber in FIG. 2) receives the fluid contained in the pipe section 7.
  • a shutter rod 15 is integral with the membrane and ends in a shutter 16 cooperating with a seat 17 located at the entrance to the outlet orifice 18 of the spillway.
  • Elements 13 to 18 are all coaxial.
  • the shutter 16 lifts from its seat if and only if the pressure prevailing in the lower chamber of the overflow exceeds the pressure corresponding to the force of the spring 13. It is therefore possible to adjust the screw 14 so that this opening occurs when the pressure in the section 7 is at least equal to an intermediate pressure PI greater than the pressure PT.
  • a gaseous CO 2 pipe 19 starts from the upper part of the tank 2 and comprises, from upstream to downstream, a stop valve 20 and a pressure reducer 21.
  • the latter delivers downstream a pressure P2 greater than PT but less than Pl Downstream of the regulator 21, the pipe 19 is divided into two branches 22 and 23 ending respectively in the sections 6 and 7 respectively of the pipe 3.
  • Each branch is equipped with a non-return valve 24 not authorizing the circulation of fluid only from regulator 21 to line 3.
  • the liquid C0 2 is admitted into the pipe 3.
  • the overflow valve 4 opens when the pressure in the section 7 is greater than the value Pl, and a jet of dry ice comes out then from the orifice 18.
  • the evacuation of this snow is carried out without hindrance thanks to the arrangement of the orifice 18 in the axis of the membrane-shutter system.
  • FIG. 4 An application of the variant of FIG. 3 is illustrated diagrammatically in FIG. 4. It is the regulation, from a pH measurement, of a flow of liquid C0 2 injected into a waste water pipe. 26 to neutralize a basic effluent.
  • the pipe 25 opens into a venturi 27 intended to inject and disperse the carbon dioxide snow in the water flow.
  • FIG. 5 a variant of the device of Figure 1 in which the pipe section 7 is divided into three branches 7A to 7C each leading to a respective overflow 4A to 4C. This makes it possible to supply C0 2 at several injection points and, by adopting different pressure settings for each outlet, to inject C0 2 flow rates that can be adjusted individually for each injection point.
  • This possibility is particularly advantageous for, for example, producing more or less cold zones in a longitudinal tunnel for freezing food products, as illustrated in FIG. 5.
  • the regulation of the valve 5 is carried out on the basis of a single temperature measurement carried out near the exit of the tunnel.
  • the C0 2 is injected in parallel by the overhangs 4A to 4C in order to distribute the refrigeration supply over the length of the tunnel 28.
  • the overflow 4A located on the inlet side 29 of the products to be treated, conveyed by a belt conveyor 30, generates a C0 2 flow rate higher than the others due to its setting on a lower PI-A pressure.
  • this first outlet may be the only one to flow.
  • FIG. 5 makes it possible to obtain in a simple and economical manner a reliable and precise regulation of the freezing process.
  • the invention can be applied to many other processes consuming C0 2 . It is particularly well suited for applications requiring a significant flow of C0 2 (at least 100 kg / h), delivered almost continuously and at a variable rate in a ratio of 1 to 5 approximately.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Freezing, Cooling And Drying Of Foods (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Accessories For Mixers (AREA)

Claims (9)

1. Verfahren zum Liefern eines variablen Mengenstroms von flüssigem C02 an wenigstens einen Abgabepunkt (A) über eine Zufuhrleitung (3) für flüssiges C02, die mit einem in Bezug auf seinen Querschnitt variablen Regelventil (5) versehen ist, bei dem der Mengenstrom von flüssigem C02 an den Abgabepunkt (A) mittels einer Abgabeeinrichtung (4), die sich öffnet, wenn der Druck stromabwärts von dem Ventil (5) höher ist als ein vorbestimmter Druck (PI), der höher ist als der Druck (PT) am C02-Tripelpunkt, derart geliefert wird, daß wenigstens in dem Abschnitt der Leitung (3) stromabwärts von dem Ventil (5) ein Druck durchgehend aufrechterhalten wird, der höher ist als derjenige am C02-Tripelpunkt.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß vor dem Anschließen der Leitung (3) an einen Vorratsbehälter (2) mit flüssigem C02 in diese Leitung stromabwärts von dem Ventil (5) C02-Gas unter einem Druck (P2) eingeleitet wird, der zwischen dem Druck (PT) am Tripelpunkt und dem vorbestimmten Druck (PI) liegt, und daß man außerdem C02-Gas mit diesem Druck (P2) in den Abschnitt der Leitung (3) einspeist, der stromaufwärts von dem Ventil (5) liegt.
3. Vorrichtung zur Lieferung eines variablen Mengenstroms von flüssigem C02 an einen C02-Abgabepunkt (A), mit einem Vorratsbehälter (2) für unter Druck stehendes C02, der an eine Zufuhrleitung (3) für C02 angeschlossen ist, die ein querschnittsveränderliches Regelventil (5) enthält, und mit einer Gasabgabeleitung (19), die einen Druckminderer (21) enthält, und über ein erstes Rückschlagventil (24) in einen stromabwärtigen Abschnitt (7) der Zufuhrleitung (3) stromabwärts von dem Ventil (5) mündet, dadurch gekennzeichnet, daß sie stromaufwärts von dem Abgabepunkt (A) wenigstens eine Abgabeeinrichtung (4) umfaßt, in die der stromabwärtige Abschnitt (7) der Zufuhrleitung (3) mündet, wobei die Abgabeeinrichtung (4) eine Abgabeeinrichtung mit Membran (12) ist, die ein Verschlußorgan (16) trägt, das mit einem ausgangsseitigen C02-Auslaßsitz zusammenwirkt, wobei die Membran in Schließrichtung des Rückschlagventils durch eine einstellbare (bei 14) Feder (13) vorgespannt ist, die derart gespannt ist, daß das Verschlußorgan (16) sich nur öffnet, wenn der C02-Druck im stromabwärtigen Abschnitt (7) der Zufuhrleitung (3) höher ist als ein Druck (PI), der höher ist als der Druck (PT) am C02-Tripelpunkt.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Gasabgabeleitung (19) über ein zweites Rückschlagventil (24) ebenfalls in einem stromaufwärtigen Teil (6) der Zufuhrleitung (3), stromaufwärts (6) von dem Regelventil (5), mündet.
5. Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß ein Schlauch (25), der im wesentlichen den selben Innendurchmesser aufweist wie der Auslaßsitz (18) der Abgabeeinrichtung, sich von diesem Sitz bis zum C02-Abgabepunkt erstreckt.
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß der Abgabepunkt durch ein Venturirohr (27) gebildet wird, das in einer Abwasserkanalisation (26) angeordnet ist.
7. Vorrichtung nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß der stromabwärtige Abschnitt (7) der Zufuhrleitung (3) wenigstens zwei Zweigleitungen (7A, 7B, 7C) umfaßt, die jeweils in einer Membranabgabeeinrichtung (4A, 4B, 4C) münden.
8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß wenigstens eine (4A) der Abgabeeinrichtungen (4A-4C) auf einen Öffnungsdruck (PI-A) eingestellt wird, der geringer ist als derjenige des oder der weiteren Abgabeeinrichtungen.
9. Kühltunnel (28) für Lebensmittelprodukte, dadurch gekennzeichnet, daß er mit C02 durch eine Vorrichtung nach einem der Ansprüche 3 bis 8 versorgt wird.
EP89403619A 1988-12-28 1989-12-22 Verfahren und Vorrichtung zur Mengenstromregelung von flüssigen CO2 und deren Anwendung für einen Kühltunnel Expired - Lifetime EP0376823B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89403619T ATE100921T1 (de) 1988-12-28 1989-12-22 Verfahren und vorrichtung zur mengenstromregelung von fluessigen co2 und deren anwendung fuer einen kuehltunnel.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8817305A FR2641854B1 (fr) 1988-12-28 1988-12-28 Procede et dispositif de regulation d'un debit de co2 liquide, et application a un tunnel de refroidissement
FR8817305 1988-12-28

Publications (3)

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EP0376823A1 EP0376823A1 (de) 1990-07-04
EP0376823B1 true EP0376823B1 (de) 1994-01-26
EP0376823B2 EP0376823B2 (de) 2001-04-11

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EP89403619A Expired - Lifetime EP0376823B2 (de) 1988-12-28 1989-12-22 Verfahren und Vorrichtung zur Mengenstromregelung von flüssigen CO2 und deren Anwendung für einen Kühltunnel

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US (1) US5040374A (de)
EP (1) EP0376823B2 (de)
AT (1) ATE100921T1 (de)
AU (1) AU629584B2 (de)
CA (1) CA2006789C (de)
DE (1) DE68912755T3 (de)
ES (1) ES2048312T5 (de)
FR (1) FR2641854B1 (de)

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US5287705A (en) * 1993-02-16 1994-02-22 Thermo King Corporation Air conditioning and refrigeration systems utilizing a cryogen
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FR2734624B1 (fr) * 1995-05-24 1997-07-04 Carboxyque Francaise Dispositif d'injection de liquide sous pression dans une enceinte
DE19621835A1 (de) * 1996-05-31 1997-12-04 Aga Ab Expansionsdüse und Verfahren zur Erzeugung von Kohlendioxidschnee
US5813237A (en) * 1997-06-27 1998-09-29 The Boc Group, Inc. Cryogenic apparatus and method for spraying a cryogen incorporating generation of two phase flow
US5868003A (en) * 1997-07-14 1999-02-09 Praxair Technology, Inc. Apparatus for producing fine snow particles from a flow liquid carbon dioxide
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Also Published As

Publication number Publication date
ES2048312T3 (es) 1994-03-16
FR2641854A1 (fr) 1990-07-20
ES2048312T5 (es) 2001-05-16
CA2006789C (fr) 1994-10-25
CA2006789A1 (fr) 1990-06-28
FR2641854B1 (fr) 1994-01-14
DE68912755T3 (de) 2001-08-02
EP0376823B2 (de) 2001-04-11
US5040374A (en) 1991-08-20
AU629584B2 (en) 1992-10-08
ATE100921T1 (de) 1994-02-15
AU4732889A (en) 1990-07-05
EP0376823A1 (de) 1990-07-04
DE68912755D1 (de) 1994-03-10
DE68912755T2 (de) 1994-05-11

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