EP1466661B1 - Vorrichtung zur Lösung eines Gases in einer Flüssigkeit - Google Patents

Vorrichtung zur Lösung eines Gases in einer Flüssigkeit Download PDF

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Publication number
EP1466661B1
EP1466661B1 EP03252180A EP03252180A EP1466661B1 EP 1466661 B1 EP1466661 B1 EP 1466661B1 EP 03252180 A EP03252180 A EP 03252180A EP 03252180 A EP03252180 A EP 03252180A EP 1466661 B1 EP1466661 B1 EP 1466661B1
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EP
European Patent Office
Prior art keywords
liquid
gas
tank
quasi
venturi tube
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 - Lifetime
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EP03252180A
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English (en)
French (fr)
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EP1466661A1 (de
Inventor
Liou Huei-Tarng
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Priority to EP03252180A priority Critical patent/EP1466661B1/de
Priority to DE60321655T priority patent/DE60321655D1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/232—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
    • B01F23/2326—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles adding the flowing main component by suction means, e.g. using an ejector
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/232—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B01F25/3121—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
    • B01F25/3141—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector mixers

Definitions

  • the invention relates to an apparatus for dissolving gas into liquid.
  • gas solutions are usually needed. However, most gases cannot easily dissolve in water. Generally, a gas solution would not achieve the desired purpose if the concentration of the gas is too low. Without some special processing procedures, a solution with low gas concentration cannot be used in real application. Therefore, an apparatus for producing high concentration of gas solution is urgent needed in commercial applications.
  • An apparatus for producing gas solution with high concentration can be implemented to different applications. Specifically, solutions with high concentration of oxygen and carbon dioxide are useful for high-density aquaculture, and solutions with high ozone concentration can be used in semiconductor wafer cleaning. Generally, the ozone concentration has to be at least 50 ppm for practical applications. These are only two examples of the many applications of solutions with high concentration of gas.
  • a widely used method for dissolving gas in water is to introduce gas into water through an orifice placed within the water. This method increases surface contact area between gas and water, and accordingly increases the rate of gas dissolving in water. Physical methods, such as lowering the temperature of water, and increasing the pressure in an enclosure containing the water and gas, may be applied to increase the rate of gas dissolving in water. Chemical reactions between the dissolved gas and the liquid medium, or reactions between the gas and other solutes dissolved within the liquid, may also increase the rate of gas dissolving in liquid; the effect, however, is not within the scope of the present invention, and thus is not to be discussed in this specification.
  • the present invention is directed to a method of dissolving gas in liquid at low cost.
  • the object of the present invention is to provide an apparatus for mixing liquid and gas, in which not only the methods of lowering the temperature of liquid and increasing pressure of liquid/gas are used, measures of introducing gas at negative pressure and using liquid whirlpool to trap the bubbles formed therein are also applied in order to obtain higher rate of gas dissolving in the liquid.
  • the specific measure adopted in the present invention is to introduce the gas generated by a gas generator to a mixer in which a valve is used for regulating the gas flowing into the mixer.
  • the mixer comprises primarily a gas expansion chamber and a device similar to a Venturi tube.
  • One of the examples was described in U.S. patent 6,534,023, filed on September 26, 2000 , and hereinafter is generally referred to as quasi-Venturi tube, in which the quasi-Venturi tube is described to pass longitudinally through an expansion chamber.
  • a pump is used for pumping the fluid so that the fluid may circulate in the claimed apparatus. When the fluid flows through the quasi-Venturi tube, a suction effect is generated.
  • Gas in the expansion chamber is sucked into the quasi-Venturi tube and carried away by the fluid.
  • the gas generated by the gas generator is introduced into the expansion chamber.
  • a valve is mounted at the inlet of the expansion chamber to regulate the gas flowing into the expansion chamber so that the quasi-Venturi tube draws in the gas in a rate greater than the flow rate of the gas into the expansion chamber. Accordingly, the gas is drawn into the quasi-Venturi tube at the state of negative pressure, namely, at a pressure lower than the atmospheric pressure.
  • the gas forms bubbles at negative pressure in the fluid flowing through the quasi-Venturi tube.
  • the bubble-containing fluid is then introduced into an inner tank of a tank enclosure which further comprises an outer tank, and generates whirlpool in the inner tank.
  • the size of the bubbles under negative pressure would further decrease, and accordingly the buoyancy is reduced.
  • the bubbles would not readily surface but remain in the liquid for an extended period of time, which in turn contributes to higher rate of gas dissolving in the liquid.
  • the pipe which supplies fresh liquid to the tank winds around the outer tank of the tank enclosure, and finally inserts into the inner tank, where the fresh liquid is blended with the bubble-carried fluid.
  • the outer tank of the tank enclosure is connected to a cooling system so that the fluid in the inner tank of the tank enclosure and the fresh fluid in the winding pipe are cooled by the cooling water supplied by the cooling system.
  • the apparatus according to the present invention may effectively increase the rate of gas dissolved in the liquid, and thus the object of the present invention is achieved.
  • the entire apparatus which comprises such mixer and tank enclosure is also available at low cost.
  • the cost effective installation of such apparatus contributes to the industrial applicability of the present invention.
  • the gas generator of the present invention can be an ozone generator, and therefore the apparatus according to the present invention can be easily converted to an apparatus for producing ozonated water with high concentration of ozone.
  • the apparatus comprises primarily a gas generator 1, a mixer 20, a tank enclosure 30, and a pump 5.
  • the gas generator 1 is connected to a gas inlet 26 of the mixer 20 by a gas pipe 44.
  • a valve 6 is arranged at the gas inlet 26 of the mixer 20.
  • the mixer 20 comprises: a container 22 and a quasi-Venturi tube 24.
  • the container 22 is an axially extended enclosure with one end provided with the gas inlet 26.
  • the gas inlet 26 is further provided with the valve 6 for regulating the flow rate of the incoming gas.
  • the quasi-Venturi tube 24 has one end being a liquid inlet port and the other end being a liquid outlet port, and is axially arranged in the container 22 so that it passes through the container 22 from one end to the other end thereof, as shown by the arrows in Fig. 2 .
  • a throat (not shown) is formed within the tube 24 and is located generally in the midst thereof.
  • a gas drawn-in port 28 is provided at a position on the wall of the tube 24, which is preferably distant from the gas inlet 26 of the container 22.
  • the space inside the container 22 but outside of the quasi-Venturi tube 24 is referred to as an expansion chamber 23.
  • the quasi-Venturi tube 24 is connected to the tank enclosure 30 through a liquid/gas tube 42 ( Fig. 1 ).
  • the tank enclosure 30 primarily comprises an inner tank 32, an outer tank 34, and a winding pipe 36.
  • the inner tank 32 has an inner tank wall 33;
  • the outer tank 34 has an outer tank wall 35, which encloses the inner tank 32.
  • a space is formed between the two tank walls 33, 35.
  • the winding pipe 36 starts with a fresh liquid inlet 9, which enters the outer tank 34 and then winds around the inner tank wall 33, preferably in helical manner, and subsequently enters the inner tank 32, and ends at a fresh liquid inlet 15.
  • the bottom of the tank enclosure 30 is provided with a liquid/gas output line 38, which is further connected to the inlet of the pump 5.
  • the outer tank 34 of the tank enclosure 30 is provided with a cooling water inlet 8 near the bottom thereof and is provided with a cooling water outlet 16 near the top thereof.
  • the tank enclosure 30 is further provided with an internal cooler 10 at the top center thereof.
  • the internal cooler 10 is provided with cooling water circulating pipes, such as an auxiliary cooling water feeding pipe 13 and an auxiliary cooling water discharging pipe 14., arranged near the liquid surface inside the tank enclosure 30.
  • the tank enclosure 30 is optionally provided with an overflow exit 11 near the top thereof so as to prevent the liquid level from exceeding a predetermined height.
  • a thermometer 12 is optionally provided to the inner tank 32 for monitoring the temperature therein.
  • the fluid is pumped by the pump 5 to flow through the quasi-Venturi tube 24 in the mixer 20 where a suction effect is thus created.
  • the gas in the container 22 would be drawn into the quasi-Venturi tube 24 via the gas drawn-in port 28 due to the suction effect.
  • the gas produced by the gas generator 1 enters container 22 via gas pipe 44, and diffuses therein.
  • the valve of the gas pipe 44 regulates the gas flow so that the gas flow rate is lower than the rate of the gas drawn into the quasi-Venturi tube 24, so as to maintain a negative pressure in the expansion chamber 23.
  • the location of the gas inlet 26 of the container 22 and the location of the gas drawn-in port 28 are near the opposite ends of the container 22, respectively. With the arrangement, the gas can fully diffuse within the expansion chamber 23 before being drawn into the quasi-Venturi tube 24, and the pressure at the gas drawn-in port 28 can remain stable. The stable pressure facilitates the bubbles to be mixed in the liquid uniformly.
  • the gas enters the quasi-Venturi tube 24 at negative pressure, and bubbles will be generated in the liquid at negative pressure (in relation to the atmospheric pressure).
  • the volume of the bubbles at negative pressure would further decrease under the liquid pressure, and in turn reduce the buoyancy of the bubbles.
  • the reduced buoyancy would allow the bubbles to be trapped in the liquid for an extended period of time. In other words, the bubbles would not emerge from the liquid and escape. The trapped bubbles facilitate the gas to dissolve in the liquid.
  • the liquid which carries the bubbles flows out of the mixer 20 and proceeds to enter the inner tank 32 of the tank enclosure 30 via the liquid/gas pipe 42.
  • the liquid/gas pipe 42 is preferably divided into two paths before entering the tank enclosure 30.
  • the divided pipes have outlets 17, 18 arranged in the inner tank 32 in parallel, horizontal manner, and in opposite directions.
  • the torque and the downward flow exiting from the liquid/gas output line 38 contribute to forming a whirlpool in the inner tank 32.
  • the whirlpool enables the bubbles to rotate in the liquid, and the bubbles will suspend in the liquid for an extended period of time. These promote the gas to dissolve in the liquid.
  • the outer tank 34 of the tank enclosure 30 is supplied with cooling water from a cooling system.
  • the cooling water enters the tank enclosure 30 from near the bottom thereof via the cooling water inlet 8, and flows out from near the top thereof via the cooling water outlet 16.
  • the cooling water is used for cooling the liquid in the inner tank 32 and the fresh liquid flows along the winding pipe 36.
  • the fresh water is supplied from outside of the tank enclosure 30 via the fresh liquid inlet 9, and flows along the winding pipe 36 which winds around the inner tank wall 33.
  • the fresh water enters the inner tank 32 near the top thereof via the fresh liquid inlet 15 and is mixed with the bubble-carrying liquid.
  • the fresh liquid, as flowing along the winding pipe 35, is cooled by the cooling water in the outer tank 34 so that the temperature thereof can be lowered to provide a higher capability of dissolving gas as it is mixed with the liquid in the inner tank 32.
  • the internal cooler 10 is arranged near the top of the inner tank 32. Inside the internal cooler 10, cooling water is circulating for cooling the liquid inside the inner tank 32.
  • the cooler 10 can be a spherical shape and be adjustably arranged at a location about the same level as the surface of the liquid at the center of the inner tank 32.
  • the internal cooler 10 is arranged to assist the cooling of the liquid contained in the inner tank 32, and also to fill in the cavity formed in the center of the whirlpool in the inner tank 32 so that the air is prevented from contacting the liquid, and thus prevents air from dissolved in the liquid. With air dissolved in the liquid, the rate of the gas to be dissolved (such as ozone) in the liquid would be adversely affected.
  • the gas/liquid flowing out of the tank enclosure 30 can be extracted for use.
  • the gas/liquid is extracted via a liquid/gas mixture outlet 2 arranged between the pump 5 and the mixer 20.
  • a liquid/gas mixture outlet valve 4 and a micro bubble filter 3 are optionally mounted in order to regulate the flow rate and to remove any suspended micro-bubbles that remain in the liquid.
  • the gas to be dissolved in the liquid forms bubbles at negative pressure.
  • the bubbles are characterized in smaller size and less buoyancy in the liquid, which in turn may be retained in the liquid for an extended period of time.
  • the whirlpool generated in the liquid helps retain the bubbles in the liquid. With the negative pressure and whirlpool effects, the capability of the liquid for dissolving gas would significantly improve if the liquid has already been under low temperature.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)

Claims (9)

  1. Eine Vorrichtung zur Lösung eines Gases in einer Flüssigkeit, die folgendes umfasst:
    einen Mischer (20), der folgendes umfasst:
    einen sich axial erstreckenden Behälter (22), der mit einem Gaseinlass (26) und einem Ventil (6) zur Einstellung der Strömungsgeschwindigkeit von in den Behälter eintretendem Gas ausgestattet ist,
    ein Rohr (24), das einem Venturirohr ähnlich und axial im Behälter angeordnet ist, wobei ein Ende des venturiartigen Rohres eine Flüssigkeitseinlassöffnung und das andere Ende eine Flüssigkeitsauslassöffnung ist, und das venturiartige Rohr eine Rohrwand hat, die mit einer Gasansaugöffnung (28) versehen ist;
    ein Tankgehäuse (30), das folgendes umfasst:
    einen inneren Tank (32) mit einer Wand,
    einen äußeren Tank (34) mit einer Wand, der den inneren Tank umschließt und einen Raum zwischen der Wand des inneren Tanks und der Wand des äußeren Tanks bildet,
    eine gewundene Leitung (36), die einen Einlass und einen Auslass hat und sich von außen ins Innere des äußeren Tanks erstreckt und sich um den inneren Tank herum windet und mit dem im Inneren des inneren Tanks angeordneten Auslass durch die Wand des inneren Tanks reicht,
    eine Flüssigkeits-/Gas-Ausgabeleitung (38), die an einer Unterseite des Tankgehäuses angebracht ist;
    eine Flüssigkeits-/Gas-Leitung (42), von der ein Ende mit der Flüssigkeitsauslassöffnung des venturiartigen Rohres verbunden ist und von welcher das andere Ende an die Unterseite des Tankgehäuses anschließt und ins Innere des Tankgehäuses eintritt, so dass die aus der Flüssigkeits-/Gas-Leitung austretende Flüssigkeit im Inneren des Tankgehäuses einen Strudel bildet;
    eine Pumpe (5) mit einer Auslassöffnung, die mit der Flüssigkeitseinlassöffnung des venturiartigen Rohres verbunden ist und einer Einlassöffnung, die mit der Flüssigkeits-/Gas-Ausgabeleitung verbunden ist; und
    einen Flüssigkeits-/Gasgemisch-Auslass (2), der sich zwischen der Auslassöffnung der Pumpe und der Flüssigkeitseinlassöffnung des venturiartigen Rohres befindet.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Tankgehäuse mit einem Kühlwassereinlass und einem Kühlwasserauslass in der Nähe der Unter- bzw. der Oberseite des Tankgehäuses versehen ist.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass sie des weiteren einen internen Kühler umfasst, wobei der interne Kühler eine Kühlwasserumlaufleitung hat, die einstellbar nahe der Flüssigkeitsoberfläche im Tankgehäuse angeordnet ist.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass der interne Kühler die Form einer hohlen Kugel hat.
  5. Vorrichtung nach Anspruch 1, 2, 3 oder 4, dadurch gekennzeichnet, dass der Gaseinlass des Behälters des Mischers in der Nähe eines Endes des Behälters angebracht ist, und dass die Gasansaugöffnung an einer vom Gaseinlass entfernten Stelle angebracht ist.
  6. Vorrichtung nach Anspruch 1, 2, 3, 4 oder 5, dadurch gekennzeichnet, dass die Flüssigkeits-/Gas-Leitung in zwei Leitungen unterteilt wird, nachdem sie aus dem venturiartigen Rohr austritt, und die beiden Leitungen in das Innere des Tankgehäuses von unten her eintreten, wobei die beiden Leitungen Auslässe haben, die parallel, jedoch in entgegengesetzter Richtung ausgerichtet sind.
  7. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sich die gewundene Leitung in schraubenförmiger Art und Weise um das Tankgehäuse windet.
  8. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie des weiteren einen Gasgenerator umfasst, der an das Ventil des Behälters angeschlossen ist.
  9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass der Gasgenerator ein Ozongenerator ist.
EP03252180A 2003-04-07 2003-04-07 Vorrichtung zur Lösung eines Gases in einer Flüssigkeit Expired - Lifetime EP1466661B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP03252180A EP1466661B1 (de) 2003-04-07 2003-04-07 Vorrichtung zur Lösung eines Gases in einer Flüssigkeit
DE60321655T DE60321655D1 (de) 2003-04-07 2003-04-07 Vorrichtung zur Lösung eines Gases in einer Flüssigkeit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03252180A EP1466661B1 (de) 2003-04-07 2003-04-07 Vorrichtung zur Lösung eines Gases in einer Flüssigkeit

Publications (2)

Publication Number Publication Date
EP1466661A1 EP1466661A1 (de) 2004-10-13
EP1466661B1 true EP1466661B1 (de) 2008-06-18

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EP03252180A Expired - Lifetime EP1466661B1 (de) 2003-04-07 2003-04-07 Vorrichtung zur Lösung eines Gases in einer Flüssigkeit

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DE (1) DE60321655D1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2103344B1 (de) * 2008-03-18 2011-02-02 Min Chien Teng Gas-Flüssigkeits-Mischer

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5427693A (en) * 1992-02-10 1995-06-27 O-Three Limited Modular ozone water treatment apparatus and associated method
GB9405000D0 (en) * 1994-03-15 1994-04-27 Boc Group Plc Gas dissolving
US6054046A (en) * 1997-04-02 2000-04-25 Nelson; William R. System for re-circulating a gas mixture to treat liquids
US6534023B1 (en) * 2000-09-26 2003-03-18 Huei Tarng Liou Fluid dynamic ozone generating assembly

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DE60321655D1 (de) 2008-07-31

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