Classifications

• • 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
  • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
• • 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—Carbon 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
  • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
• • 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
  • F17C2223/033—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
  • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
  • F17C2223/04—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by other properties of handled fluid before transfer
  • F17C2223/042—Localisation of the removal point
  • F17C2223/046—Localisation of the removal point in the liquid
• • 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
  • F17C2225/0146—Two-phase
  • F17C2225/0153—Liquefied gas, e.g. LPG, GPL
  • F17C2225/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
• • 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
  • F17C2225/035—High pressure, i.e. between 10 and 80 bars
• • 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
  • F17C2227/0128—Propulsion of the fluid with pumps or compressors
  • F17C2227/0135—Pumps
• • 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
  • F17C2227/03—Heat exchange with the fluid
  • F17C2227/0302—Heat exchange with the fluid by heating
  • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
  • F17C2227/0323—Heat exchange with the fluid by heating using another fluid in a closed loop
• • 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
  • F17C2227/03—Heat exchange with the fluid
  • F17C2227/0337—Heat exchange with the fluid by cooling
  • F17C2227/0341—Heat exchange with the fluid by cooling using another fluid
  • F17C2227/0355—Heat exchange with the fluid by cooling using another fluid in a closed loop
• • 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
  • F17C2227/03—Heat exchange with the fluid
  • F17C2227/0367—Localisation of heat exchange
  • F17C2227/0388—Localisation of heat exchange separate
• • 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
  • F17C2250/03—Control means
  • F17C2250/032—Control means using computers
• • 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
  • F17C2250/04—Indicating or measuring of parameters as input values
  • F17C2250/0404—Parameters indicated or measured
  • F17C2250/0439—Temperature
• • 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
  • F17C2250/0626—Pressure
• • 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
  • F17C2250/0631—Temperature
• • 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
• • 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
  • F17C2270/00—Applications
  • F17C2270/05—Applications for industrial use

Definitions

• the present application relates to a process for discontinuous provision and a conditioning device for discontinuous temperature control of liquid carbon dioxide and also a system for discontinuous processing of carbon dioxide comprising such a conditioning device.
• the invention relates to discontinuous provision of liquid carbon dioxide for generating carbon dioxide snow which is used for cleaning surfaces of technical components.
• liquid carbon dioxide provided can be used for foaming polymers.
• liquid carbon dioxide In these uses it is known to hold the liquid carbon dioxide centrally in a storage container.
• the liquid carbon dioxide is held, for example, in low- pressure tanks, at a pressure up to 22 bar and at an equilibrium temperature of approximately -16°C in the liquid state.
• the various consumers require the liquid carbon dioxide, however, under defined thermodynamic conditions deviating from that in the storage container, wherein a multiplicity of consumers can be supplied with the carbon dioxide from the central storage container.
• liquid carbon dioxide is required ideally at a temperature of 15°C at 60 bar, that is to say at a temperature just below the boiling temperature at this pressure. It is therefore known to transport the liquid carbon dioxide from the storage container and bring it to the desired pressure.
• the pressurized liquid carbon dioxide is heated to the desired temperature in a heat exchanger and fed to a consumer.
• This process is very efficient in continuous provision of liquid carbon dioxide.
• problems can occur in the processing of the liquid carbon dioxide.
• Such an interruption can occur, for example, in regular exchange of components that are to be cleaned or else during idle times during interruptions in operation, in such a manner that the interruption can also last some hours or days.
• the temperature of the carbon dioxide in the piping between the storage container and consumer can rise above the boiling point, and so bubbles can form in the piping.
• the secondary circuit medium can be either cooled or heated.
• the cooling and heating shall proceed in a secondary circuit outside the heat exchanger using cooling and heating units provided therefor.
• a discontinuous provision means the intermittent supply of the consumer with liquid carbon dioxide.
• the provision therefore proceeds with interruptions, wherein the interruptions can have a time period from a few seconds to some days.
• the liquid carbon dioxide is stored preferably in a low-pressure tank for up to 22 bar at a temperature between -15 and -18°C, wherein the low- pressure tank is preferably provided with a separate cooling unit or is vacuum-insulated.
• the liquid carbon dioxide is transported from the storage container by means of the pump, preferably a compressed-air-operated pump, into a first conduit connected downstream in the direction of flow of the liquid carbon dioxide. The liquid carbon dioxide is transported through the first conduit into the heat exchanger and from there via a second conduit to the consumer.
• step c) the pressure of the carbon dioxide that is transported, that is to say in particular in the first conduit, into the heat exchanger, in the second conduit and in the consumer is elevated, in particular, using the pump, to a pre-settable pressure, preferably a pressure between 30 and 90 bar, very particularly preferably to a pressure between 55 and 70 bar.
• a pre-settable pressure preferably a pressure between 30 and 90 bar, very particularly preferably to a pressure between 55 and 70 bar.
• the pressure is kept constant using a simple pressure controller.
• the temperature of the liquid carbon dioxide in the heat exchanger is brought to a pre-settable temperature.
• the transported carbon dioxide flows through the heat exchanger from a first inlet to a first outlet and the secondary circuit medium flows through the heat exchanger from a second inlet to a second outlet.
• the liquid carbon dioxide and the secondary circuit medium are in heat contact via a heat-exchange surface.
• the temperature of the secondary circuit medium and/or the volumetric flow rate of the secondary circuit medium are set in such a manner that the liquid carbon dioxide has the pre-settable temperature at the first outlet.
• the secondary circuit medium is, in particular, part of a secondary circuit which, outside the heat exchanger, comprises a pump, a heating unit and a cooling unit.
• the liquid carbon dioxide conditioned in the heat exchanger is fed in process step e) to a consumer, in particular a device for generating carbon dioxide for purifying component surfaces or to a device for foaming polymers.
• a consumer in particular a device for generating carbon dioxide for purifying component surfaces or to a device for foaming polymers.
• the pre-settable pressure and the pre-settable temperature means that, primarily, the temperature of the liquid carbon dioxide can still change slightly on the path from the heat exchanger to the consumer, in particular in the second conduit, for example by heat introduction from the surroundings.
• Preference is given to a design in which the pressure differs from the pre-settable pressure by at most 1 bar and the temperature from the pre-settable temperature by at most 1°C [Celsius] .
• the pre-settable temperature is a constant value.
• the process therefore achieves that the liquid carbon dioxide which is held in a storage container and is optionally pressurized is present in a subcooled state, can not only be heated to a temperature immediately below the boiling temperature and corresponding pressure, but that the carbon dioxide can also be cooled.
• This is advantageous, in particular, when the temperature of the liquid carbon dioxide was increased to a temperature above boiling point on the section between the storage container and the heat exchanger or the consumer. In this case, the temperature of the carbon dioxide in the heat exchanger can be lowered to the optimum temperature required for the use. Therefore, the liquid carbon dioxide is present at the consumer at a constant temperature. It is therefore particularly preferred that the secondary circuit medium is cooled during and/or after an interruption in transport.
• the secondary circuit medium is cooled, in particular, before the restart of transport, in such a manner that the liquid carbon dioxide between storage container and heat exchanger which was heated during the interruptions to a temperature above the pre-settable temperature, is cooled back to the pre-settable temperature of transport to the consumer. Therefore, even immediately after the interruption to transport, optimum conditions are available for use of the liquid carbon dioxide at the consumer. It is also preferred that the pre-settable temperature is at most 4°C below the boiling point of the carbon dioxide at the pre-settable pressure, in particular at most 2°C below boiling point. Especially for applications which require liquid carbon dioxide at a temperature only immediately below boiling point, such a procedure is advantageous. In this case, the pre-settable temperature of the carbon dioxide can be achieved either by cooling or heating the secondary circuit medium.
• the temperature difference between the pre-settable temperature and the temperature of the secondary circuit medium entering into the heat exchanger is at most 2°C.
• the temperature difference is at most 1°C.
• the pre-settable temperature of the liquid carbon dioxide is present, in particular at the first outlet of the heat exchanger. This means, in particular, that during a change from heating to cooling in the case of a fixed pre-settable temperature, the temperature of the secondary circuit medium must be changed at most by 4°C, or 2°C.
• the heat exchange surface of the heat exchanger or the volumetric flow rate of the secondary circuit medium must be designed in such a manner that the pre-settable temperature of the carbon dioxide can be set.
• volume of the secondary circuit medium means the total volume of the secondary circuit medium situated in the secondary circuit, preferably of a brine.
• the volume of the liquid carbon dioxide situated in the heat exchanger is, in particular, as great as the volume which is defined by the conduit for the liquid carbon dioxide through the heat exchanger.
• the volume of the carbon dioxide is the (interior) volume of the tube in the heat exchanger.
• Such a volume of the secondary circuit medium can have the temperature thereof altered relatively rapidly in the case of a change from heating to cooling or vice versa.
• the volume of the secondary circuit medium has a size of 10 1 [litre] to 300 1, very particularly preferably from 50 1 to 100 1.
• the mass flow rate of the carbon dioxide has a value of 20 kg/h [kilogram per hour] to 500 kg/h, very particularly preferably from 100 kg/h to 300 kg/h.
• the conduit constructed as a tube has a length of 10 m [metre] to 40 m, very particularly preferably from 20 m to 30 m for an outer tube diameter of 5 mm [millimetre] to 30 mm, very particularly preferably from 8 mm to 15 mm.
• the temperature and/or the volumetric flow rate of the secondary circuit medium is set on entry into the heat exchanger in dependence on operating parameters of the consumer.
• the operating parameters of the consumer are, in particular, the operating times thereof. Therefore, the temperature of the secondary circuit medium can be set, even in advance, to the discontinuous transport of the carbon dioxide. Thus, for example, after a relatively long interruption of, for example, one day, the temperature of the secondary circuit medium can be cooled to a desired temperature just before restart of the consumer.
• a conditioning device for discontinuous temperature control of liquid carbon dioxide, comprising a heat exchanger and a secondary circuit, wherein the heat exchanger comprises a first inlet and a first outlet for liquid carbon dioxide and a second inlet and a second outlet for a secondary circuit medium and the secondary circuit comprises the second inlet and the second outlet of the heat exchanger, wherein both a cooling unit and a heating unit are formed in the secondary circuit.
• the secondary circuit therefore comprises all conduits and devices through which the secondary circuit medium flows in operation.
• the pressurized at least partially liquid carbon dioxide enters into the heat exchanger at the first inlet and exits from the heat exchanger at the first outlet, wherein the carbon dioxide is in heat contact with the secondary circuit medium in the heat exchanger, which secondary circuit medium enters into the heat exchanger through the second inlet and exits from the heat exchanger through the second outlet.
• the secondary circuit outside the heat exchanger, is cooled with a cooling unit or heated with a heating unit.
• Such a conditioning device permits pressurized at least partially liquid carbon dioxide to be brought to a pre- settable temperature, independently of the temperature of the carbon dioxide at the first inlet.
• the heat exchanger is dimensioned with respect to the heat exchange surface, to the volume of the secondary circuit medium in the heat exchanger and to the volume of the carbon dioxide in the heat exchanger, in such a manner that, in operation, a temperature difference between the pre- settable temperature and the temperature of the secondary circuit medium entering into the heat exchanger of at most 2°C, preferably at most 0.5°C, is achievable .
• the heat exchange surface is the surface of the components which separate the liquid carbon dioxide and the secondary circuit medium and via which the heat exchange takes place.
• the outer shell surface of the tube is a heat exchange surface.
• the larger surface is the heat exchange surface.
• the temperature of the secondary circuit medium need be changed only relatively slightly on changeover from heating to cooling, in order also to be able to set the pre-settable temperature of the carbon dioxide. This can be achieved, in particular, when the volume of the secondary circuit is also relatively small.
• the heating unit can be implemented, for example, by a secondary heat exchanger through which flows a warm liquid, or preferably by a heating device.
• the cooling unit is implemented, in particular, by a third heat exchanger having a relatively cold cooling liquid, or preferably by an evaporator for evaporating a liquid.
• the secondary circuit medium is a brine and the evaporator is an air evaporator via which the brine is cooled.
• a system for discontinuous processing of carbon dioxide comprising a storage container for storing liquid carbon dioxide, a pump for transport and pressure elevation of the liquid carbon dioxide, a conditioning device according to the invention and a consumer, wherein the pump is connected via a first conduit to the first inlet and the first outlet is connected via a second conduit to the consumer.
• the storage container is preferably a low-pressure tank for up to 22 bar, which, preferably using a cooling unit, or via vacuum insulation, stores the liquid carbon dioxide at a temperature between -15 and -18°C.
• the pump is preferably compressed air-operated, via which comparatively little heat is introduced into the carbon dioxide. In operation, therefore, the stored liquid carbon dioxide is transported out of the storage container via the first conduit to the heat exchanger and further to the consumer via the second conduit.
• the consumer is, in particular, a device for generating carbon dioxide snow for cleaning a component surface, or a device for foaming polymers.
• the liquid carbon dioxide can be adjusted to optimum parameters for use by the consumer.
• the first length of the first conduit is at least five times the second length of the second conduit, very particularly preferably at least ten times, or even twenty times the length. This means that firstly the storage container can be arranged to be relatively far away from the consumer and that secondly, the conditioning device is arranged relatively close to the consumer. Therefore, the second length of the second conduit is relatively small in such a manner that a substantial influence of the temperature of the liquid carbon dioxide does not take place between the heat exchanger and the consumer.
• the second length should be at most 5 m, preferably at most 2 m.
• each conditioning device can be connected to exactly one or a plurality of consumers.
• the number of conditioning devices is preferably selected in such a manner that the second length of the second conduits is as low as possible from each heat exchanger to the consumer.
• each conditioning device is connected to exactly two consumers .
• a temperature sensor is integrated in the second conduit. The temperature sensor is arranged in particular in such a manner that the temperature of the liquid carbon dioxide is measured in the second conduit.
• the heat exchanger is dimensioned in such a manner that a temperature difference of 2°C between the temperature of the liquid carbon dioxide and the first outlet and the temperature of the secondary circuit medium at the second inlet is sufficient to set the carbon dioxide to a pre-settable temperature which is at most 2°C below the boiling point of carbon dioxide at the pressure prevailing in the heat exchanger.
• the volume of the secondary circuit is designed in such a manner that the entire secondary circuit medium can be changed by at least 3°C in no more than 5 minutes with a cooling power or heating power of 2000 to 9000 W [watt] , very particularly preferably within only 1 minute.
• a cooling power or heating power 2000 to 9000 W [watt] , very particularly preferably within only 1 minute.
• a yet further advantageous embodiment of the invention envisages that a control unit is provided which is connected to the pump, the temperature sensor and the heating unit, the cooling unit and/or the consumer, and is installed and equipped for carrying out the process according to the invention.
• the details and advantages disclosed for the process according to the invention may be applied to and used in the conditioning device according to the invention and the system according to the invention, and vice versa .
• FIG. 1 shows schematically an embodiment of the system
• a system 1 for carrying out the process according to the invention comprises a storage container 2, a conditioning device 4 and a consumer 15.
• the storage container 2 is flow-connected via a pump 3 and a first conduit 16 having a first length 18 to the conditioning device 4.
• the conditioning device 4 is further flow- connected via a second conduit 17 having a second length 19 to the consumer 15.
• the conditioning device 4 comprises a heat exchanger 5 and a secondary circuit 6.
• the secondary circuit 6 comprises, in addition to the part of the heat exchanger 5 through which a secondary circuit medium flows, a heating unit 12, an evaporator
• the entire space in the secondary circuit 6 that is filled by the secondary circuit medium has a volume 14.
• a second inlet 9 of the heat exchanger 5 and a second outlet 10 of the heat exchanger 5 are integrated in the secondary circuit 6.
• the heat exchanger 5 additionally comprises a first inlet 7 for feeding liquid carbon dioxide and a first outlet 8 for removing liquid carbon dioxide.
• the first conduit 16 is connected to the first inlet 7 and the second conduit 17 is connected to the first outlet 8.
• a temperature sensor 20 is integrated which is connected via a data line 22 to a control unit 21.
• the control unit 21 is further connected to the pump 3, the secondary circuit pump 23, the evaporator 11 and the heating unit 12, and also to the consumer 15.
• the heat exchanger 5 has a heat exchange surface 13 via which the heat exchange between liquid carbon dioxide and secondary circuit medium proceeds .
• liquid carbon dioxide is transported from the storage container 2 by the pump 3 via the first conduit 16, the heat exchanger 5 and the second conduit 17 to the consumer 15.
• the pressure of the transported carbon dioxide in the conduit 16, the heat exchanger 5 and the conduit 17 is set in this case by the pump 3 in such a manner that it takes on a pre-settable value.
• the temperature of the liquid carbon dioxide is set to a pre-settable value.
• the secondary circuit medium is either heated with the heating unit 12 or cooled with the cooling unit 11.
• the pre-settable temperature of the carbon dioxide that is achieved is monitored by means of the temperature sensor 20.
• the present invention permits vaporized carbon dioxide to be condensed in the heat exchanger 5 as soon as in the first conduit 16 and optionally in the heat exchanger 5 by cooling the secondary circuit medium with the cooling unit 11. This thus ensures that, after restart of the consumer 15, liquid carbon dioxide is provided at pre-settable parameters.
• the pre-settable temperature is, in particular, only slightly lower than the boiling temperature of the liquid carbon dioxide at the pressure set. Using the present invention, it is possible after very long interruptions or in the case of very high ambient temperatures, to feed liquid carbon dioxide to a consumer under the optimum conditions.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Carbon And Carbon Compounds (AREA)

Applications Claiming Priority (2)

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Citations (8)

• 2012
  • 2012-09-13 EP EP12184297.5A patent/EP2708794A1/fr not_active Withdrawn
• 2013
  • 2013-08-09 WO PCT/EP2013/066739 patent/WO2014040806A1/fr not_active Ceased

Patent Citations (8)

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