DE102008014979A1 - Multi-component cooling circuit operating method, involves supplying precalculated quantity per cooling medium-component into multi-component cooling circuit over automatically running sequence - Google Patents
Multi-component cooling circuit operating method, involves supplying precalculated quantity per cooling medium-component into multi-component cooling circuit over automatically running sequence Download PDFInfo
- Publication number
- DE102008014979A1 DE102008014979A1 DE200810014979 DE102008014979A DE102008014979A1 DE 102008014979 A1 DE102008014979 A1 DE 102008014979A1 DE 200810014979 DE200810014979 DE 200810014979 DE 102008014979 A DE102008014979 A DE 102008014979A DE 102008014979 A1 DE102008014979 A1 DE 102008014979A1
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- component
- cooling circuit
- medium
- refrigeration
- components
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- 239000000306 component Substances 0.000 title claims abstract description 33
- 239000012533 medium component Substances 0.000 title claims abstract description 9
- 238000001816 cooling Methods 0.000 title abstract 5
- 238000011017 operating method Methods 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 238000005057 refrigeration Methods 0.000 claims description 36
- 239000007789 gas Substances 0.000 abstract description 10
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 5
- 239000002826 coolant Substances 0.000 abstract description 4
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 abstract description 3
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract 2
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 abstract 2
- 239000001294 propane Substances 0.000 abstract 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 abstract 1
- 239000005977 Ethylene Substances 0.000 abstract 1
- 239000001282 iso-butane Substances 0.000 abstract 1
- 235000013847 iso-butane Nutrition 0.000 abstract 1
- 229910052757 nitrogen Inorganic materials 0.000 abstract 1
- 239000003507 refrigerant Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 3
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
Classifications
-
- 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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B45/00—Arrangements for charging or discharging refrigerant
-
- 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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/006—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant containing more than one component
-
- 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
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0022—Hydrocarbons, e.g. natural gas
-
- 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
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
- F25J1/008—Hydrocarbons
- F25J1/0092—Mixtures of hydrocarbons comprising possibly also minor amounts of nitrogen
-
- 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
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0244—Operation; Control and regulation; Instrumentation
- F25J1/0245—Different modes, i.e. 'runs', of operation; Process control
- F25J1/0247—Different modes, i.e. 'runs', of operation; Process control start-up of the process
-
- 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
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0244—Operation; Control and regulation; Instrumentation
- F25J1/0245—Different modes, i.e. 'runs', of operation; Process control
- F25J1/0249—Controlling refrigerant inventory, i.e. composition or quantity
-
- 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
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0244—Operation; Control and regulation; Instrumentation
- F25J1/0245—Different modes, i.e. 'runs', of operation; Process control
- F25J1/0249—Controlling refrigerant inventory, i.e. composition or quantity
- F25J1/025—Details related to the refrigerant production or treatment, e.g. make-up supply from feed gas itself
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Betreiben eines mehrkomponentigen Kältekreislaufes, bei dem zumindest zeitweilig ein Nachfüllen der einzelnen Komponenten des Kältemediums erforderlich ist.The The invention relates to a method for operating a multi-component Refrigeration circuit, at at least temporarily refilling the individual components of the refrigeration medium is required.
Mehrkomponentige Kältekreisläufe kommen bei Verflüssigungsprozessen, beispielsweise bei Erdgas-Verflüssigungsprozessen, zur Anwendung. Sofern derartige Kältekreisläufe Turboverdichter als Kreislaufverdichter aufweisen, lässt es sich nicht verhindern, dass über die Dichtungen dieser Verdichter das in den Kältekreisläufen zirkulierende Kältemedium entweicht. Bei der Verwendung von Schrauben- oder Kolbenverdichter sind diese Verluste deutlich geringer, da diese Verdichterkonstruktionen andere Dichtungssysteme aufweisen. Nichtsdestotrotz kommt es auch bei ihnen zu Verlusten an dem zirkulierenden Kältemedium.multicomponent Refrigeration circuits are included Liquefaction processes, for example, in natural gas liquefaction processes, for use. If such refrigeration circuits turbo compressors as cycle compressor have, lets it does not prevent over the seals of these compressors circulating in the refrigeration circuits refrigerant medium escapes. When using screw or piston compressors These losses are significantly lower as these compressor designs have other sealing systems. Nevertheless, it does happen with them to losses on the circulating refrigeration medium.
Die Zusammensetzung des Kältemediums sollte jedoch innerhalb enger Grenzen konstant gehalten werden – die Schwankung des relativen Anteils jeder Komponente sollte vorzugsweise nicht mehr als 5% betragen –, da ansonsten eine Verschlechterung des Verflüssigungsprozesses bzw. dessen Gesamtwirkungsgrades eintritt.The Composition of the refrigeration medium should be but kept constant within narrow limits - the fluctuation the relative proportion of each component should preferably no longer than 5% -, otherwise a deterioration of the liquefaction process or its Overall efficiency occurs.
Die zwangsläufig auftretenden Verluste an den Komponenten des Kältemediums müssen daher nachdosiert werden. Bei kleinen Verflüssigungsleistungen – hierunter sei eine Verflüssigungsleistung von max. ca. 2 MW zu verstehen – und der Verwendung von Turboverdichtern oder bei der Verwendung von Schrauben- oder Kolbenverdichtern sind die nachzufüllenden Mengen jedoch so gering, dass sie nicht sinnvoll kontinuierlich zudosiert werden können, wie dies bei Verflüssigungsprozessen mit großen Verflüssigungsleistungen üblicherweise realisiert wird.The inevitably occurring losses to the components of the refrigeration medium must therefore be replenished become. For small liquefaction services - below be a liquefaction of Max. about 2 MW to understand - and the use of turbocompressors or in the use of Screw or piston compressors are the nachzufüllenden However, quantities are so small that they do not make sense continuously can be added, such as this in liquefaction processes with large liquefaction services usually is realized.
Im Falle kleiner Verflüssigungsleistungen weisen die Kältekreisläufe im Regelfall ein Kältemedium auf, das zwischen 3 und 6 unterschiedliche Komponenten enthält. Dies sind insbesondere N2, CH4, C2H4, C2H6, C3H8, C4H10, Mischungen aus i- und n-C4H10 und C5H12, Mischungen aus i- und n-C5H12, Rohgas, abgereichertes Rohgas, verdampftes LNG oder eine beliebige Kombination aus den vorgenannten Komponenten.In the case of small liquefaction capacities, the refrigeration cycles usually have a refrigeration medium containing between 3 and 6 different components. These are in particular N 2 , CH 4 , C 2 H 4 , C 2 H 6 , C 3 H 8 , C 4 H 10 , mixtures of i- and nC 4 H 10 and C 5 H 12 , mixtures of i- and nC 5 H 12 , raw gas, depleted crude gas, vaporized LNG or any combination of the aforementioned components.
Bisher erfordert die Zudosierung der erforderlichen Menge jeder Einzelkomponente ein geschultes Betriebspersonal. Darüber hinaus ist die Zudosierung sehr zeitintensiv, da jede einzelne Komponente entweder über Handarmaturen unmittelbar vor Ort oder über automatische Ventile von der Messwarte aus gesteuert zudosiert wird. Dabei wird entweder der Volumenstrom der zuzuspeisenden Komponente gemessen oder über die Ventilcharakteristik der Durchfluss der zuzuspeisenden Komponente errechnet. Das Ventil bleibt hierbei solange geöffnet, bis die vorausberechnete Menge der zuzuspeisenden Komponente in den Kreislauf geführt wurde.So far requires the addition of the required amount of each individual component a trained operating staff. In addition, the dosage is very time-consuming, as each individual component either via manual valves directly on the spot or over automatic valves are metered controlled from the control room. In this case, either the volume flow of the zuzuspeisenden component is measured or over the valve characteristic of the flow of zuzuspeisenden component calculated. The valve remains open until the predicted Amount of component to be fed was circulated.
Aufgabe der vorliegenden Erfindung ist es, ein gattungsgemäßes Verfahren zum Betreiben eines mehrkomponentigen Kältekreislaufes, bei dem zumindest zeitweilig ein Nachfüllen der einzelnen Komponenten des Kältemediums erforderlich ist, anzugeben, das die vorgenannten Probleme vermeidet und insbesondere eine zuverlässige und wenig zeitintensive Zuführung der nachzufüllenden Komponenten des Kältemediums ermöglicht.task The present invention is a generic method for operating a multi-component refrigeration cycle, wherein at least temporarily a refill the individual components of the refrigeration medium it is necessary to specify that avoids the abovementioned problems and especially a reliable one and little time consuming feed the refillable Components of the refrigeration medium allows.
Zur Lösung dieser Aufgabe wird ein gattungsgemäßes Verfahren zum Betreiben eines mehrkomponentigen Kältekreislaufes vorgeschlagen, das dadurch gekennzeichnet ist, dass die vorausberechnete Menge pro Kältemedium-Komponente über eine automatisch ablaufende Sequenz in den Kältekreislauf zugespeist wird.to solution This object is a generic method of operation a multi-component refrigeration cycle proposed, which is characterized in that the precalculated Quantity per refrigeration medium component via an automatic sequence running in the refrigeration cycle is fed.
Weitere vorteilhafte Ausgestaltungen des erfindungsgemäßen Verfahrens zum Betreiben eines mehrkomponentigen Kältekreislaufes, die Gegenstände der abhängigen Patentansprüche darstellen, sind dadurch gekennzeichnet, dass
- – das Kältemedium wenigstens drei unterschiedliche Komponenten aufweist,
- – als Komponenten für das Kältemedium N2, CH4, C2H4, C2H6, C3H8, C4H10, Mischungen aus i- und n-C4H10 und C5H12, Mischungen aus i- und n-C5H12, Rohgas, abgereichertes Rohgas und/oder verdampftes LNG verwendet werden, und
- – nach erfolgter Zuspeisung aller Kältemedium-Komponenten die Zusammensetzung des Kältemediums überprüft wird.
- The refrigeration medium has at least three different components,
- As components for the cooling medium N 2 , CH 4 , C 2 H 4 , C 2 H 6 , C 3 H 8 , C 4 H 10 , mixtures of i- and nC 4 H 10 and C 5 H 12 , mixtures of i - and nC 5 H 12 , raw gas, depleted crude gas and / or vaporized LNG be used, and
- - After the feed of all refrigeration medium components, the composition of the refrigeration medium is checked.
Erfindungsgemäß wird die vorausberechnete Menge pro Kältemedium-Komponente nunmehr über eine automatisch ablaufende Sequenz, die im Prozessleitsystem oder einem PLC programmiert ist, in den Kältekreislauf zugespeist. Das Weiter- bzw. Umschalten auf die jeweils nächste zuzuführende Komponente erfolgt ebenfalls automatisch. Diese Prozedur wird erst dann beendet, wenn alle Komponenten mit der gewünschten bzw. berechneten Menge dem Kältemedium bzw. dem Kältekreislauf zugeführt wurden.According to the invention precalculated amount per refrigeration medium component now over an automatic sequence that runs in the process control system or programmed into a PLC, fed into the refrigeration cycle. The Further switching or switching to the respective next component to be supplied also takes place automatically. This procedure is not terminated until all components have been with the desired or calculated amount of the refrigerant or the refrigeration cycle supplied were.
Seitens des Betriebspersonals ist somit nurmehr die vorbeschriebene Prozedur in Gang zu setzen. Ein weiterer Eingriff durch das Betriebspersonal ist darüber hinaus nicht erforderlich. Nach Abschluss der Prozedur und damit erfolgter Zuspeisung aller Kältemedium-Komponenten wird die Zusammensetzung des Kältemediums, beispielsweise mittels eines Gaschromatographen, überprüft.On the part of the operating staff, therefore, only the previously described procedure is to be started. Further intervention by the operating staff is also not required. After completion of the procedure and thus completed supply of all refrigeration medium components, the composition tion of the refrigerant medium, for example by means of a gas chromatograph, checked.
Bei allen Verflüssigungsprozessen mit Turboverdichtern muss vor dem Anfahren und nach dem Abschalten des Verflüssigungsprozesses noch über einen vorgegebenen Zeitraum ein sog. Sperrgas aufgegeben werden, um die Dichtungen der Turboverdichter wirkungsvoll schützen zu können. Durch dieses Sperrgas, bei dem es sich im Regelfall um Rohgas handelt, wird die Zusammensetzung des Kältemediums wesentlich verändert.at all liquefaction processes with turbocompressors must before starting and after switching off the liquefaction process still over one given a period of time a so-called sealing gas are given to the To effectively protect the seals of the turbo compressors. Through this sealing gas, which is usually raw gas, the composition of the refrigeration medium changed significantly.
Bei den nachfolgenden Anfahrprozeduren kann sich die Zudosierung der Kältemedium-Komponenten wesentlich von der Zudosierung während des Normalbetriebes unterscheiden. Mittels des erfindungsgemäßen Verfahrens zum Betreiben eines mehrkomponentigen Kältekreislaufes lassen sich jedoch auch diese speziellen Zudosierungsprozesse programmieren und damit automatisieren.at the subsequent startup procedures, the addition of the Refrigerant medium components essential from the dosing during of normal operation differ. By means of the method according to the invention to operate a multi-component refrigeration cycle can be but also program these special dosing processes and automate it.
In diesen Fällen kann mittels des erfindungsgemäßen Verfahrens zum Betreiben eines mehrkomponentigen Kältekreislaufes eine vergleichsweise einfache und schnelle Korrektur der Zusammensetzung des Kältemediums realisiert werden.In these cases can by means of the method according to the invention to operate a multi-component refrigeration cycle a comparatively simple and rapid correction of the composition of the refrigeration medium can be realized.
Das erfindungsgemäße Verfahren zum Betreiben eines mehrkomponentigen Kältekreislaufes ermöglicht somit eine zuverlässige und wenig aufwendige Zudosierung aller Komponenten des Kältemediums. Es schafft darüber hinaus eine deutliche Entlastung für das Betriebspersonal und schließt Schalt- und Zeitfehler des Personals wirkungsvoll aus. Des Weiteren resultiert es in einer Einsparung von Betriebskosten, da sowohl die Personalkosten sinken als auch eine Verringerung des Betriebes mit Kältemittelzusammensetzungen, die als nicht optimal angesehen werden müssen, erreicht wirdThe inventive method to operate a multi-component refrigeration cycle thus allows a reliable one and less expensive addition of all components of the refrigeration medium. It does it In addition, a significant relief for the operating staff and closes switching and time errors of the staff effectively. Furthermore results It saves on operating costs as both staff costs decrease as well as a reduction of the operation with refrigerant compositions, which must be regarded as not optimal, is achieved
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200810014979 DE102008014979A1 (en) | 2008-03-19 | 2008-03-19 | Multi-component cooling circuit operating method, involves supplying precalculated quantity per cooling medium-component into multi-component cooling circuit over automatically running sequence |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200810014979 DE102008014979A1 (en) | 2008-03-19 | 2008-03-19 | Multi-component cooling circuit operating method, involves supplying precalculated quantity per cooling medium-component into multi-component cooling circuit over automatically running sequence |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE102008014979A1 true DE102008014979A1 (en) | 2009-09-24 |
Family
ID=40983978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE200810014979 Withdrawn DE102008014979A1 (en) | 2008-03-19 | 2008-03-19 | Multi-component cooling circuit operating method, involves supplying precalculated quantity per cooling medium-component into multi-component cooling circuit over automatically running sequence |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE102008014979A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016072958A1 (en) * | 2014-11-05 | 2016-05-12 | Общество С Ограниченной Ответственностью "Научно-Производственное Общество "Днипро-Мто" | Method for obtaining low temperatures and a heat exchange device‑recuperator |
-
2008
- 2008-03-19 DE DE200810014979 patent/DE102008014979A1/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016072958A1 (en) * | 2014-11-05 | 2016-05-12 | Общество С Ограниченной Ответственностью "Научно-Производственное Общество "Днипро-Мто" | Method for obtaining low temperatures and a heat exchange device‑recuperator |
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| Date | Code | Title | Description |
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| R005 | Application deemed withdrawn due to failure to request examination | ||
| R005 | Application deemed withdrawn due to failure to request examination |
Effective date: 20150320 |