WO2006102941A2 - Device for the removal of water from an aqueous solution - Google Patents

Device for the removal of water from an aqueous solution Download PDF

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Publication number
WO2006102941A2
WO2006102941A2 PCT/EP2005/051444 EP2005051444W WO2006102941A2 WO 2006102941 A2 WO2006102941 A2 WO 2006102941A2 EP 2005051444 W EP2005051444 W EP 2005051444W WO 2006102941 A2 WO2006102941 A2 WO 2006102941A2
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WO
WIPO (PCT)
Prior art keywords
water
pump
solution
aqueous solution
vacuum vessel
Prior art date
Application number
PCT/EP2005/051444
Other languages
German (de)
French (fr)
Other versions
WO2006102941A3 (en
Inventor
Jürgen Ullrich
Andreas Karsdord
Heinz Dieter Bürger
Kira Bürger
Günter Heinrich
Gabriele Mitzschke
Original Assignee
Miwe Ökokälte Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Miwe Ökokälte Gmbh filed Critical Miwe Ökokälte Gmbh
Priority to PCT/EP2005/051444 priority Critical patent/WO2006102941A2/en
Publication of WO2006102941A2 publication Critical patent/WO2006102941A2/en
Publication of WO2006102941A3 publication Critical patent/WO2006102941A3/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/28—Evaporating with vapour compression
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/04—Evaporators with horizontal tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/28—Evaporating with vapour compression
    • B01D1/2881—Compression specifications (e.g. pressure, temperature, processes)
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/048—Purification of waste water by evaporation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/126—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2220/00—Application
    • F04C2220/10—Vacuum
    • 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
    • F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • F25B25/02—Compression-sorption machines, plants, or systems

Definitions

  • the present invention relates to a device for expelling
  • the object of the invention is to provide an expeller, the water from a
  • Water-absorbing solution expels in a vacuum boiler with low energy consumption.
  • the inventive device for expelling water from an aqueous
  • Solution in a vacuum vessel is thus characterized in that it contains a Roots pump which is connected to the suction side of the gas space above the solution in the vacuum vessel and the pressure side via a dipped into the solution condensation coil to a water outlet.
  • This device allows a very efficient expulsion of the water.
  • the Wälzkolbenpumpe may be provided with a Voreinlouksselung to improve the pump cooling.
  • a Voreinlouksselung By the Voreinlouksselung water from the water outlet of the condensation coil can be sucked into each delivery chamber of the pump just before the opening to the pressure side.
  • spray heads may be mounted in the condensation coil through which an aqueous solution of a vapor pressure reducing substance such as glycol, causticate or common salt may be injected into the condensation coil.
  • a vapor pressure reducing substance such as glycol, causticate or common salt
  • the device may comprise a heating coil in the vacuum vessel, which is immersed in the solution.
  • the Roots pump may be a Helix Roots pump, which allows operation with little energy.
  • FIG. 1 schematically shows a preferred embodiment of the expeller according to the invention.
  • FIG. 2 shows a variant of FIG. 1 according to the invention.
  • FIG. 3 shows a diagram of a cooling or heating device in which the expeller according to the invention is used.
  • a vacuum vessel 1 is shown, which is connected .An Wälzkolbenpumpe 2 so that its suction inlet 3 is connected to the gas space 4 above the aqueous solution 5 in the vacuum vessel 1, while their pressure outlet 6 opens into a condensation coil 7 , which is located in the lower part of the boiler 1 and outside the boiler via a water outlet 8 to a collection container 25 shown in Figure 2 for water.
  • a fine mesh grid 10 in the upper region of the gas space 4 prevents the suction of liquid through the Roots pump.
  • Roots piston pump is shown as a per se known Roots piston pump, but it is also possible to use another displacement pump according to the isochoric compression principle (constant volume), e.g. a three-wing Roots pump or a Helix Roots pump, the latter being characterized by a very low noise at pressures above about 100 mbar.
  • a three-wing Roots pump or a Helix Roots pump is characterized by a very low noise at pressures above about 100 mbar.
  • the pump operates as a so-called vapor compressor and generates a vacuum in the
  • FIG. 1 in the output region of the Roots pump, a precontrol laßksselung shown.
  • a coolant is sucked into each of the two delivery chambers of the pump due to the pressure difference between the suction and pressure side, just before the respective chamber opens to the outlet 6 through.
  • water is used as the coolant, which passes at the outlet 8 of the condensation coil via a line 11 to corresponding inlets into the delivery chambers. This results in effective cooling of the pump, which would otherwise be significantly heated by the very hot steam on the pressure side.
  • the required compression pressure would be only 170 mbar for a LiBr solution injected at 70 ° C. instead of 1013 mbar for pure water.
  • FIG. 3 shows a cooling or heating system in which the device according to FIG.
  • FIG. 1 can be used.
  • the vapor compression in the generator 1 of the refrigeration for a cooling chamber 21 The water-laden sorbent is pumped by a pump 22 in the expeller and there concentrated as described.
  • the concentrated sorbent passes via a (parallel to the cooling chamber 21 fed) cooler 23 in the spray head of a Sprühabsorbers 24, in the water vapor is sucked from an evaporator 25.
  • the cold water in this evaporator serves as a coolant for the cooling chamber 21 and is circulated by a pump 27.
  • the bottom of the spray absorber 23 is funnel-shaped, and its lower end is connected via a height-adjustable siphon 28 with a collecting container 29, from which the pump 22, the enriched solution for processing to the expeller 1 back.
  • the gas space 4 of the expeller 1 to be evacuated to remove permanent gases. If the solution in the generator does not already have the desired temperature of, for example, HO 0 C, it must still be heated, for example by a heating coil 9 in the generator 1. During operation, further heating can then be dispensed with since the released (caused by the energy of the pump 2) released steam energy in the generator heats the solution.
  • the invention is not limited to the exemplary embodiment described with reference to FIG. 1 and the variants mentioned above.
  • the pre-let cooling can be omitted if the temperature of the pump does not exceed a limit value during operation at the predetermined pressure ratio.
  • the concrete numerical data on the temperature, the pressure and the concentration of the solution have been given only by way of illustration and do not limit the invention.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Physical Water Treatments (AREA)
  • Degasification And Air Bubble Elimination (AREA)

Abstract

The invention relates to a device for the removal of water from an aqueous solution in a vacuum vessel. According to the invention, said device comprises a Roots-type vacuum pump (2), connected on the inlet side to the gas chamber (4) above the solution in the vacuum vessel (1) and on the pressure side to a water outlet (8) via a condensation tube (7) immersed in the solution. The device is characterised by a low energy requirement on condensation of the removed water vapour.

Description

Beschreibung description
VORRICHTUNG ZUM AUSTREIBEN VON WASSER AUS EINER WÄSSRIGEN LÖSUNGDEVICE FOR EXTRACTING WATER FROM AN AQUEOUS SOLUTION
Technisches UmfeldTechnical environment
[001] Die vorliegende Erfindung bezieht sich auf eine Vorrichtung zum Austreiben vonThe present invention relates to a device for expelling
Wasser aus einer wäßrigen Lösung.Water from an aqueous solution.
[002] Zahlreiche technische Verfahren arbeiten mit einem Absorptions/Desorpti- onszyklus, wie beispielsweise Kältemaschinen, Wärmespeicher oder Wärmepumpen. Dabei wird heute Wert darauf gelegt, daß die Betriebsmittel umweltfreundlich und unbrennbar sind und daß die für das Austreiben des im Sorptionsmittel gebundenen Stoffes erforderliche Energie preiswert zur Verfügung steht. Gegenüber festen Sorptionsmitteln wie Zeolithen haben flüssige Sorbentien in Form einer wäßrigen Lösung Vorteile hinsichtlich des Apparate- und Energieaufwands. Wasser, gegebenenfalls mit Additiven zur Herabsetzung des Kristallisationspunkts, ist der bevorzugte, aber nicht ausschließlich verwendete Stoff, der vorübergehend in dem Sorptionsmittel gebunden wird. Offenbarung der ErfindungNumerous technical methods operate with an absorption / desorption cycle, such as chillers, heat storage or heat pumps. It is now important to note that the resources are environmentally friendly and incombustible and that the energy required for the expulsion of the substance bound in the sorbent is available at low cost. Compared to solid sorbents such as zeolites, liquid sorbents in the form of an aqueous solution have advantages in terms of equipment and energy costs. Water, optionally with crystallization point depressant additives, is the preferred but not exclusively used material that is temporarily bound in the sorbent. Disclosure of the invention
[003] Aufgabe der Erfindung ist es, einen Austreiber anzugeben, der Wasser aus einerThe object of the invention is to provide an expeller, the water from a
Wasser absorbierenden Lösung in einem Vakuumkessel mit geringem Energieaufwand austreibt.Water-absorbing solution expels in a vacuum boiler with low energy consumption.
[004] Dieser Austreiber ist im beiliegenden Patentanspruch 1 definiert. Bezüglich vonThis expeller is defined in the appended claim 1. Regarding of
Merkmalen bevorzugter Ausführungsformen wird auf die Unteransprüche verwiesen.Features of preferred embodiments, reference is made to the dependent claims.
[005] Die erfindungsgemäße Vorrichtung zum Austreiben von Wasser aus einer wäßrigenThe inventive device for expelling water from an aqueous
Lösung in einem Vakuumkessel ist also dadurch gekennzeichnet, daß sie eine Wälzkolbenpumpe enthält, die saugseitig an den Gasraum oberhalb der Lösung im Vakuumkessel und druckseitig über eine in die Lösung eingetauchte Kondensationsschlange an einen Wasserauslaß angeschlossen ist. Diese Vorrichtung ermöglicht ein sehr effizientes Austreiben des Wassers.Solution in a vacuum vessel is thus characterized in that it contains a Roots pump which is connected to the suction side of the gas space above the solution in the vacuum vessel and the pressure side via a dipped into the solution condensation coil to a water outlet. This device allows a very efficient expulsion of the water.
[006] In der Praxis kann zur Verbesserung der Pumpenkühlung die Wälzkolbenpumpe mit einer Voreinlaßkühlung versehen sein. Durch die Voreinlaßkühlung kann Wasser vom Wasserauslaß der Kondensationsschlange in jede Förderkammer der Pumpe kurz vor deren Öffnung zur Druckseite angesaugt werden.In practice, the Wälzkolbenpumpe may be provided with a Voreinlaßkühlung to improve the pump cooling. By the Voreinlaßkühlung water from the water outlet of the condensation coil can be sucked into each delivery chamber of the pump just before the opening to the pressure side.
[007] Alternativ können in der Kondensationsschlange Sprühköpfe angebracht sein, durch die eine wäßrige Lösung eines den Dampfdruck mindernden Stoffs wie Glykol, KaIi- umformiat oder Kochsalz in die Kondensationsschlange eingespritzt werden kann. Hierdurch wird der Dampfdruck auf der Druckseite der Wälzkolbenpumpe verringert und ebenfalls die Gefahr einer Überhitzung der Pumpe vermieden.Alternatively, spray heads may be mounted in the condensation coil through which an aqueous solution of a vapor pressure reducing substance such as glycol, causticate or common salt may be injected into the condensation coil. As a result, the vapor pressure is reduced on the pressure side of the Roots pump and also avoids the risk of overheating the pump.
[008] Ferner kann die Vorrichtung eine Heizschlange im Vakuumkessel aufweisen, die in die Lösung eingetaucht ist. Bei einer praktischen Ausführungsform kann die Wälzkolbenpumpe eine Helix-Wälzkolbenpumpe sein, die einen Betrieb mit geringem Energieaufwand ermöglicht.Further, the device may comprise a heating coil in the vacuum vessel, which is immersed in the solution. In a practical embodiment, the Roots pump may be a Helix Roots pump, which allows operation with little energy.
Kurze Beschreibung von ZeichnungenShort description of drawings
[009] Nachfolgend wird die Erfindung anhand einiger Ausführungsbeispiele und der beiliegenden Zeichnungen näher erläutert.The invention will be explained in more detail with reference to some embodiments and the accompanying drawings.
[010] Figur 1 zeigt schematisch eine bevorzugte Ausführungsform des Austreibers gemäß der Erfindung.FIG. 1 schematically shows a preferred embodiment of the expeller according to the invention.
[011] Figur 2 zeigt eine Variante zu Figur 1 gemäß der Erfindung.FIG. 2 shows a variant of FIG. 1 according to the invention.
[012] Figur 3 zeigt ein Schema einer Kühl- oder Wärmevorrichtung, in der der erfindungsgemäße Austreiber eingesetzt ist.FIG. 3 shows a diagram of a cooling or heating device in which the expeller according to the invention is used.
[013] In Figur 1 ist ein Vakuumkessel 1 gezeigt, der .an eine Wälzkolbenpumpe 2 so angeschlossen ist, daß ihr Saugeingang 3 mit dem Gasraum 4 oberhalb der wäßrigen Lösung 5 im Vakuumkessel 1 verbunden ist, während ihr Druckauslaß 6 in eine Kondensationsschlange 7 mündet, die sich im unteren Bereich des Kessels 1 befindet und außerhalb des Kessels über einen Wasserauslaß 8 zu einem in Figur 2 dargestellten Sammelbehälter 25 für Wasser führt. Ein feinmaschiges Gitter 10 im oberen Bereich des Gasraums 4 verhindert das Ansaugen von Flüssigkeit durch die Wälzkolbenpumpe.In Figure 1, a vacuum vessel 1 is shown, which is connected .An Wälzkolbenpumpe 2 so that its suction inlet 3 is connected to the gas space 4 above the aqueous solution 5 in the vacuum vessel 1, while their pressure outlet 6 opens into a condensation coil 7 , which is located in the lower part of the boiler 1 and outside the boiler via a water outlet 8 to a collection container 25 shown in Figure 2 for water. A fine mesh grid 10 in the upper region of the gas space 4 prevents the suction of liquid through the Roots pump.
[014] Letztere ist als an sich bekannte Wälzkolbenpumpe dargestellt, aber man kann auch eine andere Verdrängungspumpe nach dem isochoren Verdichtungsprinzip (konstantes Volumen) verwenden, z.B. eine dreiflügelige Wälzkolbenpumpe oder eine Helix- Wälzkolbenpumpe, wobei letztere sich durch eine sehr geringe Geräuschentwicklung bei Drücken oberhalb von etwa 100 mbar auszeichnet. So wird der aus dem Gasraum 4 des Kessels angesaugte Wasserdampf verdichtet und kondensiert dann in der Kondensationsschlange 7 unter Abgabe seiner Verdampfungsenergie an die Lösung im Kessel. Am Wasserauslaß 8 der Schlange 6 ergibt sich also heißes Wasser, das als Wärmequelle für nicht dargestellte Verbraucher genutzt werden kann.The latter is shown as a per se known Roots piston pump, but it is also possible to use another displacement pump according to the isochoric compression principle (constant volume), e.g. a three-wing Roots pump or a Helix Roots pump, the latter being characterized by a very low noise at pressures above about 100 mbar. Thus, the sucked from the gas space 4 of the boiler water vapor is compressed and then condensed in the condensation coil 7, releasing its evaporation energy to the solution in the boiler. At the water outlet 8 of the queue 6 so hot water, which can be used as a heat source for consumers not shown results.
[015] Die Pumpe arbeitet als sogenannter Brüdenverdichter und erzeugt ein Vakuum imThe pump operates as a so-called vapor compressor and generates a vacuum in the
Gasraum des Kessels. Für ein Sorptionsmittel LiBr bedeutet dies, daß zum Aufkonzentrieren einer 40%-igen wäßrigen Lösung auf 57% bei einer Temperatur von 11O0C ein Totaldruck von 300 mbar vorliegt. Bei diesem Druck schafft eine Rootspumpe ohne weiteres ein Druckverhältnis von 1:1,5 und mehr, was eine Temperaturerhöhung auf der Druckseite von bis zu 150 0C ergibt. Der Verlust an Saugvermögen bleibt unter 10%.Gas space of the boiler. For a sorbent LiBr this means that to concentrate a 40% aqueous solution to 57% at a temperature of 11O 0 C, a total pressure of 300 mbar is present. At this pressure, a Roots pump easily creates a pressure ratio of 1: 1.5 and more, resulting in a temperature increase on the pressure side of up to 150 0 C. The loss of absorbency remains below 10%.
[016] In Figur 1 ist im Ausgangsbereich der Wälzkolbenpumpe noch eine Vorein- laßkühlung dargestellt. Bei der Voreinlaßkühlung wird ein Kühlmittel in jede der beiden Förderkammern der Pumpe aufgrund der Druckdifferenz zwischen Saug- und Druckseite eingesaugt, kurz bevor die jeweilige Kammer sich zum Auslaß 6 hin öffnet. Im vorliegenden Fall wird als Kühlmittel Wasser verwendet, das am Auslaß 8 der Kondensationsschlange über eine Leitung 11 zu entsprechenden Einlassen in die Förderkammern gelangt. Dadurch ergibt sich eine wirksame Kühlung der Pumpe, die sonst von dem sehr heißen Dampf auf der Druckseite erheblich erwärmt würde.[016] In FIG. 1, in the output region of the Roots pump, a precontrol laßkühlung shown. In the Voreinlaßkühlung a coolant is sucked into each of the two delivery chambers of the pump due to the pressure difference between the suction and pressure side, just before the respective chamber opens to the outlet 6 through. In the present case, water is used as the coolant, which passes at the outlet 8 of the condensation coil via a line 11 to corresponding inlets into the delivery chambers. This results in effective cooling of the pump, which would otherwise be significantly heated by the very hot steam on the pressure side.
[017] Eine Alternative zur Entlastung der Wälzkolbenpumpe mittels Voreinlaßkühlung läßt sich durch eine Variante erzielen, die in Figur 2 gezeigt ist: Hier wird in die Kondensationsschlange 7 an mindestens einer Stelle, vorzugsweise in regelmäßigen Abständen, eine wäßrige Lösung eines den Dampfdruck des Wassers reduzierenden Stoffes über Sprühköpfe 12 eingespritzt. Es gibt zahlreiche hierfür brauchbare Stoffe, z.B. NaCl, Kaliumformiat KCOOH und Glykole. Auf diese Weise wird der Dampfdruck auf der Druckseite der Wälzkolbenpumpe, bei dem Kondensation erfolgt, verringert und so wie bei der Voreinlaßkühlung die Gefahr einer Überhitzung dieser Pumpe vermieden. Verwendete man beispielsweise für die Sprühköpfe 12 eine 40%-ige wäßrige Lösung von LiBr, dann betrüge der erforderliche Verdichtungsdruck statt 1013 mbar für reines Wasser nur noch 170 mbar für eine mit 70°C eingespritzte LiBr-Lösung.An alternative to relieving the Roots pump by means of Voreinlaßkühlung can be achieved by a variant, which is shown in Figure 2: Here, in the condensation coil 7 at least one point, preferably at regular intervals, an aqueous solution of the vapor pressure of the water reducing Stoffes injected via spray heads 12. There are many useful substances for this purpose, e.g. NaCl, potassium formate KCOOH and glycols. In this way, the vapor pressure on the pressure side of the Roots pump, in which condensation takes place, and as in the Voreinlaßkühlung avoided the risk of overheating of this pump. If, for example, a 40% strength aqueous solution of LiBr was used for the spray heads 12, then the required compression pressure would be only 170 mbar for a LiBr solution injected at 70 ° C. instead of 1013 mbar for pure water.
[018] In Figur 3 ist eine Kühl- oder Wärmeanlage gezeigt, in der die Vorrichtung gemäßFIG. 3 shows a cooling or heating system in which the device according to FIG
Figur 1 Verwendung finden kann. Hier dient die Brüdenverdichtung im Austreiber 1 der Kälteerzeugung für eine Kühlkammer 21. Das mit Wasser befrachtete Sorptionsmittel wird mit einer Pumpe 22 in den Austreiber gepumpt und dort wie beschrieben aufkonzentriert. Das konzentrierte Sorptionsmittel gelangt über einen (parallel zur Kühlkammer 21 gespeisten) Kühler 23 in den Sprühkopf eines Sprühabsorbers 24, in den auch Wasserdampf aus einem Verdampfer 25 angesaugt wird. Das kalte Wasser in diesem Verdampfer dient als Kühlmittel für die Kühlkammer 21 und wird von einer Pumpe 27 umgewälzt.Figure 1 can be used. Here, the vapor compression in the generator 1 of the refrigeration for a cooling chamber 21. The water-laden sorbent is pumped by a pump 22 in the expeller and there concentrated as described. The concentrated sorbent passes via a (parallel to the cooling chamber 21 fed) cooler 23 in the spray head of a Sprühabsorbers 24, in the water vapor is sucked from an evaporator 25. The cold water in this evaporator serves as a coolant for the cooling chamber 21 and is circulated by a pump 27.
[019] Der Boden des Sprühabsorbers 23 ist trichterförmig, und sein unteres Ende ist über einen in der Höhe einstellbaren Siphon 28 mit einem Sammelbehälter 29 verbunden, von dem die Pumpe 22 die angereicherte Lösung zur Aufbereitung zum Austreiber 1 zurückbefördert.The bottom of the spray absorber 23 is funnel-shaped, and its lower end is connected via a height-adjustable siphon 28 with a collecting container 29, from which the pump 22, the enriched solution for processing to the expeller 1 back.
[020] Zur Inbetriebnahme des Systems ist der Gasraum 4 des Austreibers 1 zu evakuieren, um Permanentgase zu entfernen. Hierzu dient eine Vakuumpumpe 30. Falls bei Inbetriebnahme die Lösung im Austreiber nicht bereits die gewünschte Temperatur von z.B. HO0C hat, muß sie noch erwärmt werden, beispielsweise durch eine Heizschlange 9 im Austreiber 1. Im laufenden Betrieb kann dann auf weitere Erwärmung verzichtet werden, da die (durch die Energie der Pumpe 2 hervorgerufene) frei werdende Ver- dampfungsenergie im Austreiber die Lösung aufheizt. Die Erfindung ist nicht auf das anhand von Figur 1 beschriebene Ausführungsbeispiel und die dazu oben erwähnten Varianten beschränkt. So kann die Vorein- laßkühlung entfallen, wenn die Temperatur der Pumpe im Betrieb bei dem vorgegebenen Druckverhältnnis einen Grenzwert nicht übersteigt. Schließlich wurden die konkreten Zahlenangaben zur Temperatur, dem Druck und der Konzentration der Lösung nur zur Erläuterung gemacht und schränken die Erfindung nicht ein. To start up the system, the gas space 4 of the expeller 1 to be evacuated to remove permanent gases. If the solution in the generator does not already have the desired temperature of, for example, HO 0 C, it must still be heated, for example by a heating coil 9 in the generator 1. During operation, further heating can then be dispensed with since the released (caused by the energy of the pump 2) released steam energy in the generator heats the solution. The invention is not limited to the exemplary embodiment described with reference to FIG. 1 and the variants mentioned above. Thus, the pre-let cooling can be omitted if the temperature of the pump does not exceed a limit value during operation at the predetermined pressure ratio. Finally, the concrete numerical data on the temperature, the pressure and the concentration of the solution have been given only by way of illustration and do not limit the invention.

Claims

Ansprücheclaims
[001] Vorrichtung zum Austreiben von Wasser aus einer wäßrigen Lösung in einemApparatus for expelling water from an aqueous solution in one
Vakuumkessel, dadurch gekennzeichnet, daß sie eine Wälzkolbenpumpe (2) enthält, die saugseitig an den Gasraum (4) oberhalb der Lösung im Vakuumkessel (1) und druckseitig über eine in die Lösung eingetauchte Kondensationsschlange (7) an einen Wasserauslaß (8) angeschlossen ist.Vacuum vessel, characterized in that it contains a Roots pump (2) which is connected on the suction side to the gas space (4) above the solution in the vacuum vessel (1) and on the pressure side via a condensing coil (7) immersed in the solution to a water outlet (8) ,
[002] Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Wälzkolbenpumpe mit einer Voreinlaßkühlung versehen ist.Apparatus according to claim 1, characterized in that the Roots pump is provided with a Voreinlaßkühlung.
[003] Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß durch die Voreinlaßkühlung Wasser vom Wasserauslaß (8) der Kondensationsschlange (7) in jede Förderkammer der Pumpe kurz vor deren Öffnung zur Druckseite angesaugt wird.Apparatus according to claim 2, characterized in that by the Voreinlaßkühlung water from the water outlet (8) of the condensation coil (7) is sucked into each delivery chamber of the pump shortly before the opening to the pressure side.
[004] Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß in der Kondensationsschlange (7) Sprühköpfe (12) angebracht sind, durch die eine wäßrige Lösung eines den Dampfdruck mindernden Stoffs wie Glykol, Kaliumformiat oder Kochsalz in die Kondensationsschlange eingespritzt werden kann.Apparatus according to claim 1, characterized in that in the condensation coil (7) spray heads (12) are mounted, through which an aqueous solution of a vapor pressure reducing substance such as glycol, potassium formate or common salt can be injected into the condensation coil.
[005] Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß eine Heizschlange (9) im Vakuumkessel (1) vorgesehen ist, die in die Lösung eingetaucht ist.Device according to one of the preceding claims, characterized in that a heating coil (9) in the vacuum vessel (1) is provided, which is immersed in the solution.
[006] Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Wälzkolbenpumpe (2) eine Helix- Wälzkolbenpumpe ist. Device according to one of the preceding claims, characterized in that the Roots pump (2) is a helical Roots piston pump.
PCT/EP2005/051444 2005-03-30 2005-03-30 Device for the removal of water from an aqueous solution WO2006102941A2 (en)

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JP2015132210A (en) * 2014-01-14 2015-07-23 日本化学機械製造株式会社 Heat recovery system in evaporator using vapor compression type root blower
CN109404281A (en) * 2018-12-13 2019-03-01 江阴爱尔姆真空设备有限公司 A kind of automatic liquid collecting air cooling Roots vacuum system

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CN109404281A (en) * 2018-12-13 2019-03-01 江阴爱尔姆真空设备有限公司 A kind of automatic liquid collecting air cooling Roots vacuum system

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