EP1499447B1 - Eduktor-mischersystem - Google Patents

Eduktor-mischersystem Download PDF

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Publication number
EP1499447B1
EP1499447B1 EP02731561A EP02731561A EP1499447B1 EP 1499447 B1 EP1499447 B1 EP 1499447B1 EP 02731561 A EP02731561 A EP 02731561A EP 02731561 A EP02731561 A EP 02731561A EP 1499447 B1 EP1499447 B1 EP 1499447B1
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EP
European Patent Office
Prior art keywords
tube
eductor
nozzle
discharge
solute
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EP02731561A
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English (en)
French (fr)
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EP1499447A4 (de
EP1499447A1 (de
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Avrom R. Handleman
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Individual
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Priority claimed from PCT/US2002/013468 external-priority patent/WO2003092900A1/en
Publication of EP1499447A1 publication Critical patent/EP1499447A1/de
Publication of EP1499447A4 publication Critical patent/EP1499447A4/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
    • B01F23/50—Mixing liquids with solids
    • B01F23/56—Mixing liquids with solids by introducing solids in liquids, e.g. dispersing or dissolving
    • 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
    • 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
    • B01F25/3124—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow
    • B01F25/31242—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow the main flow being injected in the central area of the venturi, creating an aspiration in the circumferential part of the conduit
    • 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
    • B01F25/3124—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow
    • B01F25/31243—Eductor or eductor-type venturi, i.e. the main flow being injected through the venturi with high speed in the form of a jet
    • 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
    • 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
    • B01F23/40—Mixing liquids with liquids; Emulsifying

Definitions

  • This invention relates to an eductor-mixer system particularly adapted for the preparation of dispersions, solutions and slurries. More particularly, the eductor-mixer system of this invention is an improvement over the eductor-mixer system disclosed in my prior United States Patent Nos. 4,186,772 (on which the two-part form of independent claim 1 is based) and 3,777,775.
  • An eductor-mixer system is designed to continuously mix a solute such as paint pigments, fire retardants, liquids and gels, (e.g., a powder, particulate, or other pressure transportable or fluidizable material, a liquid or a gas) and a solvent or working fluid (e.g., a liquid or in some instances a gas) to form a dispersion, slurry, or solution.
  • a solute such as paint pigments, fire retardants, liquids and gels, (e.g., a powder, particulate, or other pressure transportable or fluidizable material, a liquid or a gas) and a solvent or working fluid (e.g., a liquid or in some instances a gas) to form a dispersion, slurry, or solution.
  • the solute inlet of an eductor-mixer system is conventionally connected to the discharge outlet of a fluidized container so that a vacuum generated within the eductor-mixer by the flow of solvent (working fluid) through an internal nozzle cooperates with the fluidized discharge of the powder from the container to positively draw the fluidized solute into the eductor-mixer.
  • Existing state-of-the-art eductor-mixer systems typically include a conical, converging stream of working fluid, as most solutes used with these systems require a relatively large diameter solute tube and conveying line (more than 1.0 - 1.5 inches) to be transported vacuum pneumatically without clumping or clogging.
  • a conical nozzle is required to deflect the working fluid stream into a discharge tube small enough in diameter to meet the cross-sectional area criterion for vacuum generation and mixing.
  • solute materials may be vacuum transported in smaller diameter tubes, these smaller diameter solute tubes suffer from accretion of the solute material at the discharge outlet due to small amounts of the working fluid splashing back into the solute tube from turbulence formed at the conical deflector in the discharge tube.
  • US patent No. 5.023,021 discloses a cartridge Venturi having an aspirator tube received with the discharge end thereof in a Venturi throat of a cartridge body. Fluid from the aspirator tube is discharged into the Venturi throat upstream of the divergent outlet section thereof. In one embodiment, an end piece is fixed to the cartridge body to form a radial diffuser.
  • US patent No. 5,842,600 there is disclosed a mixing Venturi in which an outlet projection of a delivery pressure conduit is received in a nozzle throat upstream of a nozzle outlet.
  • the powder supply even if it is in a fluidized container, is required to be located above the level of the eductor-mixer system because the latter is dependent upon gravity feed of the powder.
  • the eductor-mixers are not dependent upon gravity feed because the vacuum within the eductor-mixer is sufficient to positively draw the powder from the container into the eductor-mixer systems, and thus these systems are not dependent upon the relative location of the powder container and the eductor-mixer system.
  • the eductor-mixer system of the present invention is a significant improvement of the aforementioned eductor-mixer systems and is capable of conveying a greater amount of material and generating a higher vacuum pressure due to an improved nozzle design. Furthermore, it overcomes problems associated with splash-back and clogging of narrow diameter solute tubes commonly associated with the use of conical working fluid jets.
  • an eductor-mixer system particularly well suited for either continuous or batch preparation of dispersions, solutions, or slurries from a fine granular, particulate, or powdered solute, or other pressure transportable or fluidizable material and a working fluid or solvent:
  • an eductor-mixer system of this invention comprises an eductor body having a working fluid passage extending therethrough for flow of a pressurized working fluid from one end of the working fluid passage, constituting an inlet end, to the other end of the working fluid passage, constituting a discharge end, the working fluid passage being generally of uniform circular cross-section throughout its length.
  • the body has an opening therein opposite the discharge end of the working fluid passage with the opening being coaxial with the discharge end and being of substantially smaller diameter than the diameter of the working fluid passage.
  • a insert comprising a ring separate from the body, having inside and outside faces, and a central opening therethrough from its inside to its outside face, is removably mounted in place at the discharge end of the working fluid passage coaxial with the discharge end
  • the central opening in the ring being of substantially smaller diameter than the diameter of the working fluid passage.
  • a cylindrical tube of substantially smaller diameter than the diameter of the working fluid passage extends from outside the body through the opening in the body opposite the discharge end of the working fluid passage and extends forward in the working fluid passage from the inner end of the opening in the body into the central opening in the ring.
  • the tube is open at its end in the central opening in the ring, the open end of the tube constituting a discharge end.
  • the tube is axially adjustable in, and removable from, the opening, and is adapted for connection of its end outside the body to a source of fluent material to be educted and mixed with the working fluid for the flow of the material through the tube and out of the discharge end of the tube.
  • the discharge end of the tube is substantially coplanar with the outside face of the ring.
  • the inner periphery of the ring bounding the central opening in the ring is formed in-part as a entrance extending from the inside face towards the outside face of the ring and convergent in downstream direction from the inside to the outside face of the ring, and in part as a cylindrical nozzle surface extending from the narrowest portion of the entrance to the outside face of the ring.
  • the narrowest portion of the entrance of the ring surrounds and is spaced from the cylindrical exterior surface of the tube a distance which is small relative to the diameter of the outer end of the entrance, the cylindrical nozzle surface thereby providing an annular orifice between the exterior cylindrical surface of the tube and the cylindrical nozzle surface of the ring for delivery of the pressurized working fluid from the passage through the orifice.
  • the pressurized working fluid is delivered in the form of an annular jet.
  • the gap between the exterior cylindrical surface of the tube and the cylindrical nozzle surface of the ring is relatively small and the length of the annular cylindrical orifice is relatively short for rapid acceleration of the working fluid flowing through the orifice to a relatively high linear velocity with low flow losses.
  • the discharge passage extends outwardly from the ring and has an external diameter at its end at the outside face of the ring larger than the diameter of the cylindrical nozzle surface of the ring, the internal surface of the means lying outward of, and parallel to, the projection of the jet throughout its length.
  • a preferred embodiment of the eductor-mixer of the present invention is shown to comprise an eductor body or housing 3, having a curved passage therethrough for a working fluid or solvent from an inlet 5 at one end of the passage (also referred to as a first inlet).
  • the housing is adapted to be connected to a source of pressurized working fluid or solvent (e.g., to a liquid line or a pump) and to convey the working fluid or solvent to the other end of the passage, constituting a discharge end, and a second inlet 7 adapted to be connected to a supply of pressure transportable or fluidizable material (also referred to herein as a solute or fluent material).
  • the passage is generally of uniform circular cross-section throughout its length. However, passages having non-uniform cross sectional areas and of different shapes such as "T" forms, may be adapted for use with the disclosed eductor-mixer system, and correspondingly are considered within the scope of the invention.
  • the solvent inlet may be connected to the discharge side of a liquid pump or to another source of pressurized working fluid. Inlet 7 may be connected via an appropriate hose to the discharge opening of a fluidized container.
  • Fluidized containers are used in transporting and storing "semi-bulk" quantities (e.g., more than a bag full and less than a truck or railroad car full) of powdered, fine granular, particulate, or other fluent or fluidizable material, such as powdered fire retardant materials, paint pigments, cement, oil well drilling muds, barite, diatomaceous earth, talc, lime, etc. It is often necessary to mix the powdered solute with a solvent upon unloading of the solute to form a dispersion, slurry or solution.
  • "semi-bulk" quantities e.g., more than a bag full and less than a truck or railroad car full
  • powdered fire retardant materials e.g., more than a bag full and less than a truck or railroad car full
  • paint pigments e.g., paint pigments, cement, oil well drilling muds, barite, diatomaceous earth, talc, lime, etc
  • eductor-mixer system of this invention described and claimed hereinafter will be referred to primarily in conjunction with fluidized containers for mixing powdered solutes with liquid solvents, it will be understood that the eductor mixer system of this invention need not be used in conjunction with a fluidized container, and it may be used to mix all types of solutes and solvents. It will be particularly understood that the eductor-mixer system of this invention may be used to mix both liquid and gaseous solvents and solutes.
  • the eductor-mixer system of the present invention is an improvement over the eductor-mixer system shown in United States Patent Nos. 4,186,772 and 3,777,775 , illustrated in Figure 2A.
  • the body or housing 3 of the eductor-mixer system of this invention is preferably cast or fabricated of a suitable metal, such as stainless steel, and has the passage or plenum chamber 9 formed therewithin in communication with solvent inlet 5.
  • a sleeve 11 extends from the housing coaxial with the discharge end of the passage. It will be understood, however, that sleeve 11 could extend internally into housing 3.
  • Solute inlet 7 is shown to comprise a cylindrical tube 13 of somewhat smaller diameter than the bore of sleeve 11. Tube 13 is insertable into the sleeve so as to extend through plenum chamber or passage 9 with the pressurized working fluid or solvent filling the plenum chamber or passage and surrounding the solute inlet tube.
  • a receiving member, generally indicated at 15, is removably secured to housing 3. The interior of this receiving member constitutes a passage means 17 in which the solute is dispersed in the solvent and in which the solute and solvent are mixed.
  • An insert 19 is disposed within housing 3 at the discharge end of the passage or chamber 9 between chamber 9 and passage means 17.
  • This insert is shown to be a flat ring having a central or nozzle opening 21 therein which receives the inner or discharge end of solute tube 13.
  • the nozzle opening 21 is somewhat larger than the outer diameter of the discharge end of the solute tube and the latter is substantially centered within the opening 21 thereby to define an annular nozzle opening or orifice N concentric with the solute tube through which working fluid under pressure in plenum chamber or passage 9 is discharged at high velocity into the receiving member 15.
  • the solvent is discharged as an annular jet J, and it generates a vacuum within the passage means.
  • the vacuum is in communication with the discharge end of solute tube 13 and thus positively draws or sucks the solute into the passage means 17.
  • solute tube 13 is of substantially smaller diameter than passage 9 and has uniform outer diameter OD and inner diameter D1 adjacent the discharge end, thereby having a cylindrical exterior surface 23.
  • Insert 19 has an inner cylindrical nozzle surface 25 concentric to the cylindrical exterior surface 23, which defines a central opening or nozzle 21.
  • the diameter of opening 21 and the length of cylindrical nozzle surface 25 in the direction of flow through the nozzle depend on the desired flow conditions through the nozzle.
  • the flow rate through the nozzle is similarly a function of the pressure within plenum chamber or passage 9 and passage means 17 and the cross sectional flow area of nozzle N.
  • the latter is the cross-sectional area of the gap G (see Fig. 3) between cylindrical exterior surface 23 of the solute tube and the cylindrical nozzle surface 25.
  • the vacuum generated by the jet discharged from the nozzle into the passage means is dependent upon the velocity of the jet.
  • the eductor-mixer 1 of this invention is particularly well suited to efficiently accelerate the working fluid from plenum chamber or passage 9 into the passage means 17 in several important ways.
  • the cross-sectional area of the plenum chamber or passage is quite large in relation to the cross-sectional area of nozzle N. This allows working fluid to flow through the passage at a speed much slower than it flows through the nozzle so that there is little or no energy lost by the flow of the working fluid through the passage.
  • the length L of the nozzle in the direction of the flow therethrough is relatively quite short. This permits the solvent to be almost instantaneously accelerated to its discharge velocity in a short distance, thus minimizing the flow losses while flowing through, and discharging from, the nozzle at high linear velocity.
  • nozzle surface 25 may be a sharp knife edge having an extremely short effective length L (e.g., a few thousandths of an inch) in the direction of flow through the nozzle.
  • the nozzle surface may preferably have longer length L approximately equal in length to the width of gap G for purposes that will later be described. It will be understood that as the nozzle length L increases, shear (and related energy loss) in the nozzle is increased. Shear, of course, is also greater with narrower nozzle gaps.
  • the ratio of the nozzle length L to the gap thickness G preferably should range between about 0.001 for a knife edge surface 23 and up to about 10 for a cylindrical nozzle surface 25 which is parallel to the exterior cylindrical surface 23 on tube 13.
  • receiving member 15 comprises a constant-diameter discharge conduit 16 abutting the outside surface of the nozzle member 19, defining passage means 17.
  • the diameter D3 of the inner end or bore of the discharge conduit 16 is slightly larger than the outer diameter D2 of nozzle opening 21.
  • a third way in which the eductor-mixer system of this invention minimizes energy loses is to equalize the areas into which the jet of fluid passing through nozzle N can expand.
  • the cross sectional area of the discharge conduit 16, as seen in Fig. 3, which is inside the jet at the surface of the annular nozzle N, having the diameter OD of the solute tube 13, must approximate the cross sectional area of the discharge conduit 16 which is external to the jet at the surface of the annular nozzle N.
  • This second cross sectional area is defined as the annular area between the inner diameter D3 of the discharge conduit and the outer diameter of the annular nozzle N, defined by D2 at the outer surface of the nozzle N.
  • the eductor-mixer system of this invention minimizes energy losses is that the internal surface of discharge conduit 16 adjacent nozzle N lies outward of and parallel to the projected path of the cylindrical jet J (as indicated by the dotted lines in FIG. 3) as the jet is discharged from the nozzle. This insures that frictional wall losses along the passage means walls are minimized as the jet flows at high speeds into the passage means. Further, the diameter of the discharge conduit at any point there along is larger than the diameter of the projected path of the jet so as to insure that the walls of the discharge conduit are clear of the jet.
  • the cross-sectional area of the discharge conduit 16 downstream from passage means 17 is about 3 to 10 times the cross-sectional area of gap G larger for higher discharge velocities and on the low side for lower discharge velocities.
  • the resulting structure will have an annular nozzle of a larger diameter, a gap G of narrower width, and no corresponding change in cross sectional area of the gap.
  • the prior eductor-mixer system yields a vacuum pumping capacity ratio of 0.23 scf/usg
  • the present invention at the same fluid pressure yields a vacuum pumping capacity ratio of 0.34 scf/usg, a 48% improvement in efficiency.
  • the vacuum generated by the educator-mixer system 1 of this invention is more efficient than the prior art eductor-mixer system shown in the above United States Patent Nos. 4,186,772 and 3,777,775 in positively drawing more air and consequently even more solute into the eductor-mixer system.
  • the eductor-mixer system of this invention is able to induct a greater quantity of powered solute or to be located at a greater distance from the powdered solute in the solute fluidized container than had been heretofore possible. Accordingly, the location of the eductor-mixer system and the solute supply even less critical that had heretofore been the case with the prior art systems.
  • the surfaces 23 and 25 on the solute tube and insert may be hardened (e.g., carburized or nitrided) to provide a hard wear-resistant surface for resisting flow wear abrasion by the solvent and solute flowing therethrough at high speeds. It will also be understood that, alternatively, these surfaces may be hardened by making them of a special material which resists flow wear abrasion.
  • solute tube 13 extends into housing 3 through sleeve 11 with the sleeve having an inside diameter slightly greater than the outside diameter of the solute tube.
  • the latter has one or more circumferential grooves 28 for receiving an O-ring seal 29 which in turn seals the solute tube relative to the bore of the sleeve when the former is axially inserted into the latter.
  • This seal permits the solute tube to be moved axially in and out of the sleeve while remaining sealed relative thereto.
  • the sleeve 11 is substantially coaxial with nozzle opening 21 in insert 19 and with mixing tube 15.
  • solute tube 13 is inserted into housing 3 via sleeve 11 and through plenum 9 so that the discharge end of the tube is generally coplanar with the downstream end of nozzle surface 25 and is coaxial with nozzle opening 21 so that the gap G is of uniform thickness around the tube and so that the solvent in the plenum surrounds the solute tube.
  • a plurality (e.g., three) of threaded fasteners 31 is threadably carried by sleeve 11 for engagement with the outer surface of solute tube 13. With all of the fasteners 31 engaging the outer surface of tube 13, the tube is firmly secured in place relative to the sleeve at any desired axial position within the sleeve.
  • the end of the tube may be readily adjusted relative to nozzle surface 25, and secured in position when the tube is properly centered within the nozzle opening with gap G being of substantially uniform thickness around the outlet end of the solute tube.
  • fasteners 31 may be loosened and solute tube 13 may be readily removed thereby to enable resurfacing of cylindrical exterior surface 23 on the tube, or the solute tube may be moved farther into the housing thereby to accommodate the wear of the solute tube and/or the wear of nozzle surface 25.
  • the nozzle opening or orifice through the eductor-mixer of the present invention is a continuous annular gap around the solute tube with no supports, flow dividers or other restrictions in the nozzle which would block or otherwise impede the flow of fluid therethrough.
  • the concentric solvent jet is a continuous annular jet as it is discharged from the nozzle.
  • flow dividers could be placed between the outer surface of the solute tube and the inner surface of the nozzle for supporting or centering the outer end of the solute tube in the nozzle opening. If this is done, the solvent jet discharged from the nozzle will not necessarily be a continuous annular jet, but rather would be a series of separate cylindrical jets within the passage means. These separate jets are considered to be within the scope of the present invention.
  • insert 19 is a ring-like member and, as best shown in Fig. 3, has a shoulder 41 in its front face toward chamber 9 and an outwardly projecting flange 43.
  • Shoulder 41 has a diameter substantially the same as the circular inner bore of housing 3 and thus the step is readily received within the open end of the housing so as to center the nozzle opening relative to the longitudinal center line of sleeve 11 and solute tube 13 inserted therein.
  • Housing 3 and receiving tube 15 each have respective flanges 45 and 47 adapted to be sealingly secured together in face-to-face relation. With the receiving tube flange 47 in sealing engagement with nozzle flange 43, insert 19 is held captive in a desired position relative to the housing and the receiving member.
  • a circumferential groove 49 is provided on the outer face of flange 47 for receiving an O-ring 51 which seals the receiving member to the housing.
  • Flanges 45 and 47 each have sloped outer faces and are adapted to be drawn together by a sealing hoop clamp 53, such as is commercially available from the Aeroquip Company of Los Angeles, California. Upon tightening clamp 53 on flanges 45 and 47, these flanges are drawn into face-to-face sealing engagement with the O-ring 51. It will be understood, however, that means other than clamp 53 may be used for releasably and sealably securing the mixing tube 15 to housing 3.
  • eductor 1 of this invention may readily be converted from one flow rate capacity to another merely by exchanging one insert 19 for another having different nozzle opening dimensions and exchanging receiving member 15 to maintain a desired ratio between the gap cross sectional area and the passage means cross sectional area.
  • the length L' of the conduit 16 is preferably about 5 to 50 times longer than its diameter D3, and even more preferably, is about 15 to 30 times longer than its diameter so as to enhance the mixing (i.e., dispersion) of the solute and the working fluid within the conduit.
  • the ratio L'/D3 preferably should range between about 5 and 50 and even more preferably between about 15 and 30. It will be understood, however, that this ratio could be varied considerably and even be outside the above-stated preferred ranges and still be within the scope of this invention. This ratio depends upon many factors, such as the physical characteristics of the solute and solvent being mixed, the flow rates and pressures, and temperatures of the solute and solvent, and many other factors.

Claims (11)

  1. Eduktor-Mischersystem mit einem Eduktorkörper (3), der einen durch den Körper hindurchführenden Kanal (9) aufweist zur Strömung eines unter Druck stehenden Arbeitsfluids von einem Kanalende (5), das ein Einlassende (5) des Kanals (9) bildet, zu dem anderen Kanalende, das ein Auslassende des Kanals (9) bildet;
    einem ringförmigen Einsatzstück (19) in dem Kanal (9) angrenzend an das Auslassende;
    einem Rohrstück für Gelöstes (13) mit kleinerem Durchmesser als der Durchmesser des Kanals (9), wobei das Rohrstück für Gelöstes (13) sich von ausserhalb des Eduktorkörpers (3) in den Eduktorkörper (3) hineinerstreckt und ein inneres Ende des Rohrstückes für Gelöstes (13) im Wesentlichen koaxial mit Bezug auf das ringförmige Einsatzstück (19) ist und das innere Ende des Rohrstückes für Gelöstes (13) im Wesentlichen koplanar mit der stromabwärtigen Fläche des Einsatzstückes (19) ist; und
    einem Auslassrohr (15), das an dem Körper (3) stromabwärts des Einsatzstückes (19) befestigt ist;
    wobei das Rohrstück für Gelöstes (13) und das Einsatzstück (19) eine Ringdüse (N) begrenzen, und das Druckfluid beim Durchströmen der Ringdüse (N) eine wesentliche Geschwindigkeitszunahme erfährt, um einen Niedrigdruckbereich in dem Auslassrohr (15) stromabwärts der Ringdüse (N) zu bilden, wobei das Rohrstück für Gelöstes (13) zum Transport eines fliessfähigen Materials dient, das ein körniger, pulveriger oder anderer partikelartiger Feststoff, oder eine Flüssigkeit oder ein Gas sein kann, zum Vermischen mit dem unter Druck stehenden Arbeitsfluid stromabwärts der Düse (N);
    wobei eine Innenfläche (25) des Einsatzstückes (19) eine Aussenfläche der Ringdüse (N) bildet, und eine Aussenfläche (23) des Rohrstückes für Gelöstes (13) eine Innenfläche der Ringdüse (N) bildet,
    dadurch gekennzeichnet, dass die Aussenfläche (23) des Rohrstückes für Gelöstes (13) eine einheitliche zylindrische Fläche (23) aufweist, die mit der Innenfläche (25) des Einsatzstückes (19) eine einheitliche zylindrische Düsenauslassöffnung bildet koaxial mit dem Rohrstück für Gelöstes (13), um die longitudinale Geschwindigkeitskomponente des Arbeitsfluids beim Austritt aus der Ringdüse (N) in das Auslassrohr (15) zu maximieren.
  2. Eduktor-Mischersystem nach Anspruch 1, gekennzeichnet desweiteren durch eine erste Querschnittsfläche, die durch einen Durchmesser (OD) der äusseren zylindrischen Fläche (23) des Rohrstückes für Gelöstes (13) begrenzt ist, und eine zweite Querschnittsfläche eines Ringbereiches, der durch den Innendurchmesser (D3) des Auslassrohres (15) und einen Durchmesser der Aussenfläche der Ringdüse (N) an der Auslassöffnung (21) begrenzt ist, und wobei die erste Querschnittsfläche etwa gleich der zweiten Querschnittsfläche ist.
  3. Eduktor-Mischersystem nach Anspruch 1, dadurch gekennzeichnet, dass die Länge der Ringdüse (N) etwa das 0,10-2,0-fache des Abstandes zwischen der äusseren zylindrische Fläche des Rohrstückes für Gelöstes (13) und der Innenfläche (25) des Einsatzstückes (19) in dem Bereich, der die Auslassöffnung (21) der Ringdüse (N) begrenzt, beträgt.
  4. Eduktor-Mischersystem nach Anspruch 1, dadurch gekennzeichnet, dass das Auslassrohr (15) eine innere Querschnittsfläche aufweist, die dem 2-10-fachen der Querschnittsfläche der ringförmigen Düsenöffnung (21) entspricht.
  5. Eduktor-Mischersystem nach Anspruch 1, dadurch gekennzeichnet, dass die Länge des Auslassrohres (15) etwa das 10-40-fache des inneren Durchmessers (D3) des Auslassrohres (15) beträgt.
  6. Eduktor-Mischersystem nach Anspruch 1, dadurch gekennzeichnet, dass die Ringdüse (N) so gestaltet ist damit die Geschwindigkeit des aus der Ringdüse (N) austretenden Arbeitsfluids zwischen etwa 30 Fuss/Sekunde und 300 Fuss/Sekunde liegt.
  7. Eduktor-Mischersystem nach Anspruch 1, dadurch gekennzeichnet, dass die Innenfläche (25) an der Auslassöffnung (21) des Einsatzstückes (19) eine zylindrische Düsenfläche (25) ist, die die zylindrische Aussenfläche (23) des Rohrstückes für Gelöstes (13) umgibt, und von dieser um ein Mass beabstandet ist, das klein ist im Vergleich zu dem Durchmesser der zylindrischen Düsenfläche (25),
    und ein Bereich, der die Ringdüse (N) zwischen der zylindrischen Aussenfläche (23) des Rohrstückes für Gelöstes (13) und der zylindrischen Düsenfläche (25) des Einsatzstückes (19) bildet, ziemlich klein ist und die Länge der Düse (N) verhältnismässig kurz ist zur schnellen Beschleunigung des durch die Düse (N) strömenden Arbeitsfluids auf eine verhältnismässig hohe Lineargeschwindigkeit.
  8. Eduktor-Mischersystem nach Anspruch 1, dadurch gekennzeichnet, dass das Auslassrohr (15) einen gleichförmigen Innendurchmesser (D3) an einem ersten an der Aussenfläche des Einsatzstückes (19) anliegenden Ende aufweist, der grösser ist als der Aussendurchmesser der Auslassöffnung (21) der Ringdüse (N), wobei die Innenfläche des Auslassrohres (15) ausserhalb eines Arbeitsfluidstrahles liegt, welcher auf der stromabwärts liegenden Fläche des Einsatzstückes (19) austritt, und völlig frei von diesem Strahl entlang seiner gesamten Länge ist.
  9. Eduktor-Mischersystem nach Anspruch 1, dadurch gekennzeichnet, dass das Einsatzstück (19) einen Ring aufweist mit einem Umfangsflansch (43), der an dem Ende des Körpers (3) am Auslassende des Kanals (9) anliegt;
    wobei das Auslassrohr (15) eine Auslassleitung aufweist mit einer Länge gleichförmigen Durchmessers, wobei die Auslassleitung am Ring anliegt und diesen in dem Auslassende des Kanals (9) zurückhält; und
    Mittel (53) zum lösbaren Befestigen der Auslassleitung an dem Körper (3).
  10. Eduktor-Mischersystem nach Anspruch 1, dadurch gekennzeichnet, dass die Querschnittsfläche eines Auslasskanals (17) des Auslassrohres (15) proportional ist zu der Querschnittsfläche der Ringdüse (N), und die radiale Lage der Ringdüse (N) abhängig ist vom Aussendurchmesser der zylindrischen Aussenfläche (23) des Rohrstückes für Gelöstes (13).
  11. Eduktor-Mischersystem nach Anspruch 1, dadurch gekennzeichnet, dass die Innenfläche (25) des Einsatzstückes (19) an der Düsenauslassöffnung (21) die Form einer scharfen Schneidkante aufweist mit einer äusserst kurzen axialen Länge, von z.B. einigen Tausendstel Zoll, oder die Form einer zylindrischen Fläche hat mit grösserer Länge, vorzugsweise etwa entsprechend der radialen Weite der Düsenauslassöffnung (21).
EP02731561A 2002-04-30 2002-04-30 Eduktor-mischersystem Expired - Lifetime EP1499447B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2002/013468 WO2003092900A1 (en) 1998-08-06 2002-04-30 Eductor mixer system

Publications (3)

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EP1499447A1 EP1499447A1 (de) 2005-01-26
EP1499447A4 EP1499447A4 (de) 2006-06-07
EP1499447B1 true EP1499447B1 (de) 2007-06-13

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AT (1) ATE364447T1 (de)
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DE (1) DE60220721T2 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113457479B (zh) * 2021-07-22 2022-09-23 上海交通大学 定量浓度持续稳定的粉尘气溶胶发生系统

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3338560A (en) * 1965-04-15 1967-08-29 Dow Chemical Co Mixing apparatus
BE764407A (fr) * 1971-03-17 1971-08-16 Four Industriel Belge Dispositif pour le dosage d'un melange de deux gaz.
JPS544869A (en) * 1977-06-15 1979-01-13 Babcock Hitachi Kk Mixer for reducing agent and diluting agent
US5023021A (en) * 1990-03-07 1991-06-11 Conrad Richard H Cartridge venturi
US5842600A (en) * 1996-07-11 1998-12-01 Standex International Corporation Tankless beverage water carbonation process and apparatus

Also Published As

Publication number Publication date
ATE364447T1 (de) 2007-07-15
DE60220721T2 (de) 2008-03-06
DE60220721D1 (de) 2007-07-26
EP1499447A4 (de) 2006-06-07
EP1499447A1 (de) 2005-01-26
AU2002303535A1 (en) 2003-11-17

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