DE2854508C2 - Method and device for the low-temperature decomposition of a gas mixture - Google Patents
Method and device for the low-temperature decomposition of a gas mixtureInfo
- Publication number
- DE2854508C2 DE2854508C2 DE19782854508 DE2854508A DE2854508C2 DE 2854508 C2 DE2854508 C2 DE 2854508C2 DE 19782854508 DE19782854508 DE 19782854508 DE 2854508 A DE2854508 A DE 2854508A DE 2854508 C2 DE2854508 C2 DE 2854508C2
- Authority
- DE
- Germany
- Prior art keywords
- expansion machine
- partial flow
- low
- compressor
- gas mixture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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
- 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
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
- F25J3/0429—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
- F25J3/04303—Lachmann expansion, i.e. expanded into oxygen producing or low pressure column
-
- 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
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04406—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system
- F25J3/04412—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Separation By Low-Temperature Treatments (AREA)
Description
Die Erfindung betrifft ein Verfahren zur Tieftemperaturzerlegung eines Gasgemisches durch zweistufige Rektifikation, bei dem das zu zerlegende Gasgemisch komprimiert und in zwei Teilströme zerlegt wird, von denen der erste weiterverdichtet, in Wärmetausch mit Zerlegungsprodukten abgekühlt, in einer Entspannungsmaschine entspannt und, ebenso wie der zweite Teilstrom, der Rektifiziereinrichtung zugeführt wird, wobei die Leistung der Entspannungsmaschine arbeitsleistend abgegeben wird, sowie eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for the low-temperature decomposition of a gas mixture by two-stage Rectification, in which the gas mixture to be separated is compressed and split into two partial flows, of which the first is further compressed, cooled in heat exchange with decomposition products, in an expansion machine expanded and, like the second partial flow, is fed to the rectification device, wherein the power of the relaxation machine is outputting work, as well as a device for Implementation of the procedure.
Ein derartiges Verfahren ist in der DE-OS 25 57 453 beschrieben. Der weiterverdichtete Teilstrom wird einem Kondensator-Verdampfer zugeführt, dort teilweise verflüssigt und anschließend in die Hochdrucksäule der zweistufigen Rektifiziersäule eingeführt. Aus der Hochdrucksäure wird ein Gasstrom entnommen, in einer Turbine entspannt und in die Niederdrucksäule geleitet.Such a method is described in DE-OS 25 57 453. The further compressed partial flow is fed to a condenser-evaporator, partially liquefied there and then into the high-pressure column introduced the two-stage rectification column. A gas stream is withdrawn from the high pressure acid, in relaxed in a turbine and fed into the low-pressure column.
Übersteigt die aus der Hochdrucksäule entnommene Gasmenge einen bestimmten Betrag, nimmt die Produktausbeute ab, weshalb es erstrebenswert ist, diese Menge möglichst klein zu halten. Andererseits soll die Turbine eine gewisse Mindestkälteleistung erbringen. Zur Erfüllung der beiden Forderungen muß das Druckgefälle an der Turbine vergrößert werden. Diese Maßnahme erfordert jedoch einen zusätzlichen Energieaufwand. Exceeds that taken from the high pressure column If the amount of gas exceeds a certain amount, the product yield decreases, which is why it is desirable to keep this amount as small as possible. On the other hand, the turbine should provide a certain minimum cooling capacity. To meet the two requirements, the pressure drop across the turbine must be increased. These However, the measure requires an additional expenditure of energy.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zu entwickeln, bei dem eine Steigerung der Produktion bei der Zerlegung von Gasgemischen ohne zusätzlichen Energiebedarf ermöglicht wird.The invention is therefore based on the object of developing a method in which an increase in Production in the decomposition of gas mixtures is made possible without additional energy requirements.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der gesamte weiterverdichtete erste Teilstrom über die Entspannungsmaschine geleitet und die an der Entspannungsmaschine geleistete Arbeit vollständig zur Weiterverdichtung des ersten Teilstromes verwendet wird.This object is achieved according to the invention in that the entire further compressed first partial flow over the relaxation machine and the work done on the relaxation machine to the full Further compression of the first partial flow is used.
diejenige Gasmenge weiterverdichtet zu werden, die anschließend entspannt wird. Der entspannte Gasstromthat amount of gas to be further compressed, which is then expanded. The relaxed gas flow
ίο wird danach direkt in den Niederdruckteil derίο is then fed directly into the low-pressure part of the
Durch den Gegenstand der vorliegenden Erfindung wird an der Entspannungsmaschine ein ausreichendes Druckgefälle ohne zusätzliche energieverbrauchende Maßnahmen und ohne Verringerung der Produktausbeute erzielt Die von der Entspannungsmaschine erbrachte Leistung kommt über den angekoppelten Verdichter der Entspannungsmaschine wieder zugute.The subject matter of the present invention makes a sufficient one on the relaxation machine Pressure gradient without additional energy-consuming measures and without reducing the product yield achieved The power provided by the expansion machine comes via the connected Compressors benefit the expansion machine again.
Das erfindungsgemäße Verfahren eignet sich beson-2a ders für die Luftzerlegung.The method according to the invention is particularly suitable ders for air separation.
Es erweist sich als zweckmäßig, wenn in Weiterbildung des Erfindungsgedankens der gesamte erste Teilstrom nach seiner Entspannung der Niederdruckstufe, und der zweite Teilstrom der Hochdruckstufe einer zweistufigen Rektifiziersäule zugeführt wird.It proves to be expedient if, in a further development of the inventive concept, the entire first Partial flow after its relaxation of the low pressure stage, and the second partial flow of the high pressure stage one two-stage rectification column is fed.
Eine Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens enthält einen ersten Verdichter, dessen Ausgang einerseits über einen weiteren Verdichter und eine nachfolgende Entspannungsmaschine mit einer Rektifiziereinrichtung, und andererseits direkt mit dieser Rektifiziereinrichtung verbunden ist, und ist dadurch gekennzeichnet, daß der weitere Verdichter und die Entspannungsmaschine mechanisch gekoppelt sind.A device for carrying out the method according to the invention contains a first compressor, its output on the one hand via a further compressor and a subsequent expansion machine a rectifying device, and on the other hand is directly connected to this rectifying device, and is characterized in that the further compressor and the expansion machine are mechanically coupled are.
Weitere Einzelheiten der vorliegenden Erfindung werden anhand eines schematisch dargestellten Ausführungsbeispiels erläutert.Further details of the present invention are based on a schematically illustrated embodiment explained.
Hierbei zeigt die Figur eine Anlage zur Durchführung des erfindungsgemäßen Verfahrens.
Das erfindungsgemäße Verfahren wird am Beispiel der Luftzerlegung beschrieben. Zu zerlegende Luft 1
wird einem ersten Verdichter 2 zugeführt und auf etwa 6 bar verdichtet. Anschließend wird der Luftstrom in
zwei Teilströme 3 und 4 zerlegt. Teilstrom 3 wird in einem Wärmetauscher 5 in Wärmetausch mit Zerlegungsprodukten
abgekühlt und bei 6 in den Hochdruckteil 7 einer Doppelrektifiziersäule eingeführt. Der
Hochdruckteil 7 wird mit ca. 5,85 bar betrieben. Teilstrom 4 wird in einem weiteren Verdichter 9 auf
so einen Druck zwischen 84 bar und 8,7 bar verdichtet,
anschließend in einem separaten Querschnitt von Wärmetauscher 5 gegen Zerlegungsprodukte auf etwa
-145° C gekühlt und erfindungsgemäß vollständig eirier
Turbine 10 zugeführt, die mechanisch mit dem Verdichter 9 gekoppelt ist. Der die Turbine 10
verlassende Gasstrom wird bei 11 in den Niederdruckteil 8 der Doppelrektifiziersäule eingeführt. Der
Niederdruckteil 8 wird mit etwa 13 bar betrieben. Rohfraktionen von Stickstoff und Sauerstoff werden
über Leitungen 12 und 13 dem Hochdruckteil 7 entnommen und dem Niederdruckteil 8 zugeführt. Die
Zerlegungsprodukte werden über Leitungen 14 (Sauerstoff) und 15 (Stickstoff) entnommen, im Wärmetauscher
5 angewärmt und aus der Anlage geführt.
Anhand eines Zahlenbeispiels sollen die Vorteile des erfindungsgemäßen Verfahrens verdeutlicht werden:The figure shows a system for carrying out the method according to the invention.
The method according to the invention is described using the example of air separation. Air 1 to be broken down is fed to a first compressor 2 and compressed to about 6 bar. The air flow is then broken down into two partial flows 3 and 4. Partial flow 3 is cooled in a heat exchanger 5 in heat exchange with decomposition products and introduced at 6 into the high-pressure part 7 of a double rectification column. The high pressure part 7 is operated at approx. 5.85 bar. Partial flow 4 is compressed in a further compressor 9 to such a pressure between 84 bar and 8.7 bar, then cooled in a separate cross section of heat exchanger 5 against decomposition products to about -145 ° C and, according to the invention, completely fed to turbine 10, which mechanically with the compressor 9 is coupled. The gas flow leaving the turbine 10 is introduced at 11 into the low-pressure part 8 of the double rectification column. The low-pressure part 8 is operated at about 13 bar. Crude fractions of nitrogen and oxygen are removed from the high-pressure part 7 via lines 12 and 13 and fed to the low-pressure part 8. The decomposition products are removed via lines 14 (oxygen) and 15 (nitrogen), heated in the heat exchanger 5 and passed out of the system.
The advantages of the method according to the invention are to be illustrated using a numerical example:
Wird bei einer Luftzerlegungsanlage der bisher bekannten Art zur Deckung der Kälteverluste einIs used in an air separation plant of the previously known type to cover the cold losses
Normvolumen von ζ. B, 20 00Om3Zh Luft in den Niederdruckteil eingeblasen, so beträgt die Kälteleistung der Turbine unter der Annahme eines Eintrittsdruckes von 5,85 bar, eines Austrittsdrucks von 1,35 bar, einer Austrittstemperatur von einigen Grad über der Kondensationstemperatur und einem adiabatischen Wirkungsgrad von 84% etwa 847 000kJ/h. Wird dagegen die Turbinenleistung über den angebauten weiteren Verdichter 9 erfindungsgemäß in Form von höherem Eintrittsdruck ausschließlich dem in der Tui'bine 10 entspannten Luftstrom zugeführt, so wird eine Druckerhöhung von 6 bar vor dem weiterenStandard volume of ζ. B, 20 00Om 3 Zh air is blown into the low-pressure part, assuming an inlet pressure of 5.85 bar, an outlet pressure of 1.35 bar, an outlet temperature of a few degrees above the condensation temperature and an adiabatic efficiency of 84% about 847,000 kJ / h. If, on the other hand, the turbine power is fed exclusively to the air flow relaxed in the tube 10 via the attached further compressor 9 according to the invention in the form of a higher inlet pressure, a pressure increase of 6 bar is achieved before the further
Verdichter 9 auf 8,4 bar nach dem Verdichter 9 erreicht. Bei einem Druckverlust von 0,2 bar bis zur Tuvbjne erhält man eine Kälteleistung von etwa 1 085 000 kj/h.Compressor 9 reached 8.4 bar after the compressor 9. With a pressure loss of 0.2 bar up to the Tuvbjne, a cooling capacity of around 1,085,000 kj / h is obtained.
Aus diesem Beispiel ergibt sich durch die erfindungsgemäße Verfahrensführung eine Vergrößerung der Kälteleistung von 238 000 kj/h, was einer zusätzlichen Flüssigsauerstoff-Produktion von 410 mVh (Normvolumen) entsprichtFrom this example, the process management according to the invention results in an increase in the Cooling capacity of 238,000 kJ / h, which corresponds to an additional liquid oxygen production of 410 mVh (standard volume) is equivalent to
Analog könnte auch die Turbinen-Durchsatzmenge auf ein Normvolumen von ca. 15 750 mVh verringert werden, was eine größere Produktausbeute der Anlage zur Folge hätte.Similarly, the turbine throughput rate could also be reduced to a standard volume of approx. 15,750 mVh which would result in a greater product yield of the system.
Hierzu 1 Blatt Zeichnungen1 sheet of drawings
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19782854508 DE2854508C2 (en) | 1978-12-16 | 1978-12-16 | Method and device for the low-temperature decomposition of a gas mixture |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19782854508 DE2854508C2 (en) | 1978-12-16 | 1978-12-16 | Method and device for the low-temperature decomposition of a gas mixture |
Publications (2)
Publication Number | Publication Date |
---|---|
DE2854508A1 DE2854508A1 (en) | 1980-06-19 |
DE2854508C2 true DE2854508C2 (en) | 1981-12-03 |
Family
ID=6057465
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19782854508 Expired DE2854508C2 (en) | 1978-12-16 | 1978-12-16 | Method and device for the low-temperature decomposition of a gas mixture |
Country Status (1)
Country | Link |
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DE (1) | DE2854508C2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3643359A1 (en) * | 1986-12-18 | 1988-06-23 | Linde Ag | Method and device for air separation by two-stage rectification |
DE19537913A1 (en) * | 1995-10-11 | 1997-04-17 | Linde Ag | Triple column process for the low temperature separation of air |
DE19537910A1 (en) * | 1995-10-11 | 1997-04-17 | Linde Ag | Double column process and device for the low temperature separation of air |
EP0775880A2 (en) | 1995-11-21 | 1997-05-28 | Linde Aktiengesellschaft | Double column process and apparatus for cryogenic air separation |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4781739A (en) * | 1984-08-20 | 1988-11-01 | Erickson Donald C | Low energy high purity oxygen increased delivery pressure |
DE3610973A1 (en) * | 1986-04-02 | 1987-10-08 | Linde Ag | METHOD AND DEVICE FOR PRODUCING NITROGEN |
US4783209A (en) * | 1986-07-02 | 1988-11-08 | Erickson Donald C | Cryogenic air distillation with companded nitrogen refrigeration |
US4777803A (en) * | 1986-12-24 | 1988-10-18 | Erickson Donald C | Air partial expansion refrigeration for cryogenic air separation |
US4769055A (en) * | 1987-02-03 | 1988-09-06 | Erickson Donald C | Companded total condensation reboil cryogenic air separation |
GB9008752D0 (en) * | 1990-04-18 | 1990-06-13 | Boc Group Plc | Air separation |
FR2726046B1 (en) | 1994-10-25 | 1996-12-20 | Air Liquide | METHOD AND INSTALLATION FOR EXPANSION AND COMPRESSION OF AT LEAST ONE GAS STREAM |
US5956973A (en) * | 1997-02-11 | 1999-09-28 | Air Products And Chemicals, Inc. | Air separation with intermediate pressure vaporization and expansion |
US5907959A (en) * | 1998-01-22 | 1999-06-01 | Air Products And Chemicals, Inc. | Air separation process using warm and cold expanders |
US5966967A (en) * | 1998-01-22 | 1999-10-19 | Air Products And Chemicals, Inc. | Efficient process to produce oxygen |
US5956974A (en) * | 1998-01-22 | 1999-09-28 | Air Products And Chemicals, Inc. | Multiple expander process to produce oxygen |
US5901576A (en) * | 1998-01-22 | 1999-05-11 | Air Products And Chemicals, Inc. | Single expander and a cold compressor process to produce oxygen |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB985068A (en) * | 1960-04-11 | 1965-03-03 | British Oxygen Co Ltd | Separation of air |
DE1117616B (en) * | 1960-10-14 | 1961-11-23 | Linde Eismasch Ag | Method and device for obtaining particularly pure decomposition products in cryogenic gas separation plants |
IT961138B (en) * | 1971-02-01 | 1973-12-10 | Air Liquide | PLANT FOR COMPRESSING A FLUID BY EXPANSION OF ANOTHER FLUID |
DE2557453C2 (en) * | 1975-12-19 | 1982-08-12 | Linde Ag, 6200 Wiesbaden | Process for the production of gaseous oxygen |
DE2646690A1 (en) * | 1976-10-15 | 1978-04-20 | Linde Ag | Oxygen and steam mixer for cellulose bleaching - has air fractionating plant supplying liquid oxygen to steam nozzle |
-
1978
- 1978-12-16 DE DE19782854508 patent/DE2854508C2/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3643359A1 (en) * | 1986-12-18 | 1988-06-23 | Linde Ag | Method and device for air separation by two-stage rectification |
DE19537913A1 (en) * | 1995-10-11 | 1997-04-17 | Linde Ag | Triple column process for the low temperature separation of air |
DE19537910A1 (en) * | 1995-10-11 | 1997-04-17 | Linde Ag | Double column process and device for the low temperature separation of air |
EP0775880A2 (en) | 1995-11-21 | 1997-05-28 | Linde Aktiengesellschaft | Double column process and apparatus for cryogenic air separation |
Also Published As
Publication number | Publication date |
---|---|
DE2854508A1 (en) | 1980-06-19 |
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