WO2000074830A1 - Melangeurs entraines par un fluide - Google Patents

Melangeurs entraines par un fluide Download PDF

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Publication number
WO2000074830A1
WO2000074830A1 PCT/GB1999/001538 GB9901538W WO0074830A1 WO 2000074830 A1 WO2000074830 A1 WO 2000074830A1 GB 9901538 W GB9901538 W GB 9901538W WO 0074830 A1 WO0074830 A1 WO 0074830A1
Authority
WO
WIPO (PCT)
Prior art keywords
mixer
fluid
body portion
flow
exterior
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.)
Ceased
Application number
PCT/GB1999/001538
Other languages
English (en)
Inventor
Donovan Graham Ellam
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to PCT/GB1999/001538 priority Critical patent/WO2000074830A1/fr
Priority to AU42726/99A priority patent/AU4272699A/en
Publication of WO2000074830A1 publication Critical patent/WO2000074830A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/45—Mixing liquids with liquids; Emulsifying using flow mixing
    • B01F23/454—Mixing liquids with liquids; Emulsifying using flow mixing by injecting a mixture of liquid and gas
    • 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
    • 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
    • B01F2025/91—Direction of flow or arrangement of feed and discharge openings
    • B01F2025/917—Laminar or parallel flow, i.e. every point of the flow moves in layers which do not intermix

Definitions

  • This invention relates to a fluid driven mixer and to a method of mixing material with a fluid driven mixer.
  • An existing fluid driven mixer (shown in Figure 3) comprises a central tubular conduit 22 into which air is pumped and injected from within the tube to cause a flow of material for mixing to be entrained and sucked into the tube.
  • problems arise with this type of device because turbulence can be created in the material for mixing and also pieces of solid matter within the material for mixing become trapped on the mixer, eventually reducing the efficiency due to potential partial blockage, because of a build-up of material around the originally trapped piece.
  • a fluid powered mixer comprises an inlet portion, a body portion and an outlet portion which define a conduit, in which the body portion is operable to direct a pressurised driving fluid into the conduit towards the outlet portion to thereby entrain a flow of material to be mixed through the conduit, wherein the exterior of the mixer is shaped to enhance a sympathetic flow of material to be mixed around the exterior of the mixer from the inlet portion, over the body portion and to the outlet portion.
  • the sympathetic flow is smooth, non-turbulent flow.
  • the angle made between exterior surfaces of adjacent portions of the mixer may be greater than 120°, preferably greater than 130°, most preferably 135° or greater.
  • the mixer may have a tubular lateral cross-section.
  • the body portion may have an exterior surface that curves between the inlet and outlet portions, preferably with a convex curve.
  • the body portion may have an exterior surface with a diameter which increases from a first diameter to a second diameter and decreases to the first diameter along its length.
  • the first diameter may be a diameter of the inlet and/or the outlet portion.
  • the second diameter may be the maximum diameter of the mixer.
  • the exterior surface of the body portion may have a constant radius of curvature.
  • the exterior surface may have a radius of curvature that is greater than a maximum diameter of the mixer.
  • the mixer may have an exterior surface which is substantially free of projections on which solid material for mixing could snag.
  • the mixer may have a welded construction.
  • the inlet, body and outlet portions may be welded together.
  • the pressurised driving fluid may be steam, preferably for pasteurisation of sewage for mixing.
  • the mixer may also be a pump.
  • a method of mixing material with a fluid driven mixer comprises directing pressurised fluid into a conduit formed by inlet, body and outlet portions of a mixer, said fluid being directed towards the outlet portion to thereby entrain a flow of material in which the mixer is located through the conduit, wherein the mixer is shaped to enhance a sympathetic flow of the material along the exterior of the mixer, from the inlet portion, over the body portion and to the outlet portion.
  • the pressurised fluid may be steam, preferably for pasteurising the material as well as mixing the material.
  • the material may be sewage, for pasteurisation and subsequent use as fertiliser.
  • Figure 1 is a schematic cross-sectional view of a fluid driven mixer
  • Figure 2 is a partial schematic cross section of the mixer shown in figure 1;
  • FIG 3 is a schematic cross sectional view of a prior art fluid driven mixer.
  • a fluid driven mixer 10 comprises a tubular inlet portion 12 a body portion 14 and a tubular outlet portion 16. Gas is supplied to the body portion 14 by a supply line 18 which is fed by an external source (not shown) . Alternatively other fluids such as liquids may be used to drive the mixer. The gas is ejected from an annular exhaust section 20 into a central cavity 22 of the mixer 10. The gas is directed out of the outlet portion 16, which results in a flow of material in which the mixer is placed being entrained with the flow of gas. Material is drawn into the tubular inlet portion 12 and forced out of the tubular outlet portion 16. A sympathetic flow, shown by lines 24a and 24b, is induced around the exterior of the mixer 10 from the inlet portion 12 to the outlet portion 16.
  • the mixer 10 has a steel outer casing, with the inlet and outlet portions 12 and 16 and body portion 14 together having a smooth outer surface.
  • the body portion 14 forms a bulbous central portion with a surface which curves between the inlet and outlet portions.
  • the body portion 14 is generally circular in lateral cross section, as shown in figure 2.
  • the central cavity 22 also has a smooth surface.
  • the exterior surface of the body portion makes an angle of approximately 135° with the inlet and outlet portion, where they join.
  • Both the exterior and interior surfaces are designed to offer a minimum amount of resistance, or surface features on which solid material can snag.
  • the mixer described herein when used in the treatment of waste water and sewage, the problem of plastic bags, and other solid non biodegradable items snagging on the mixer, as frequently occurs, is significantly reduced.
  • the outlets in the exhaust section 20 take the form of openings which extend from the hollow body portion to the central cavity 22.
  • the outlets make an angle C (see figure 1) to the longitudinal axis of the pump.
  • the openings make an angle D with a radius of the body portion 14.
  • the internal constructional details of the fluid driven mixer 10 described herein have already been described in UK patent applications GB 2,242,370 and GB 2,313,410, both in the name of D G Ellam. However, those documents do not disclose a fluid driven mixer which has the characteristic of requiring considerably less maintenance due to snagging of materials on the mixer, due to the construction of its external parts .
  • the fluid driven mixer 10 described herein can also be used in applications other than waste water/sewage treatment mentioned above, such as mixing or driving liquids or powders from one location to another through conduits.
  • the mixer 10 may also be a pump. Also, the mixer can be used for mixing dry materials such as grain and the like.
  • a further use for the mixer described herein is in the field of pasteurisation. Waste water and sewage must be treated to kill bacteria before it can be used as a fertiliser. At present, one way can be to treat sewage by introducing lime into the sewage to kill the bacteria.
  • the mixer described herein can be driven by steam, which has the effect of both mixing the material and also pasteurising the sewage and thereby killing bacteria, as required. More generally, the mixer can be driven by steam, hot fluid, or hot gas to effect a heat treatment of the material to be mixed.
  • the fluid driven mixer described herein has significant advantages over previous fluid driven mixers in that the period of time over which a mixer can be run without maintenance is considerable increased, because there is a much reduced risk of the mixer reducing in efficiency due to partial blocking when material is snagged on the mixer.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Accessories For Mixers (AREA)

Abstract

L'invention concerne un mélangeur (10) entraîné par un fluide, comprenant une entrée tubulaire (12), un corps (14) et une sortie tubulaire (16). Une ligne d'alimentation (18), alimentée par une source externe (non représentée), injecte du gaz dans le corps (14). Le gaz est éjecté d'une section d'échappement annulaire (20) située dans une cavité centrale (22) du mélangeur (10). Le gaz est dirigé hors de la sortie (16), générant un flux de matière dans lequel est placé le mélangeur, entraîné par le flux de gaz. La matière est entraînée dans l'entrée tubulaire (12) et extraite de la sortie tubulaire (16). Un flux sympathique, représenté par les lignes (24a) et (24b), est induit autour de l'extérieur du mélangeur (10), depuis l'entrée (12) jusqu'à la sortie (16).
PCT/GB1999/001538 1999-06-03 1999-06-03 Melangeurs entraines par un fluide Ceased WO2000074830A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/GB1999/001538 WO2000074830A1 (fr) 1999-06-03 1999-06-03 Melangeurs entraines par un fluide
AU42726/99A AU4272699A (en) 1999-06-03 1999-06-03 Fluid driven mixers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/GB1999/001538 WO2000074830A1 (fr) 1999-06-03 1999-06-03 Melangeurs entraines par un fluide

Publications (1)

Publication Number Publication Date
WO2000074830A1 true WO2000074830A1 (fr) 2000-12-14

Family

ID=10846420

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/001538 Ceased WO2000074830A1 (fr) 1999-06-03 1999-06-03 Melangeurs entraines par un fluide

Country Status (2)

Country Link
AU (1) AU4272699A (fr)
WO (1) WO2000074830A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3829070A (en) * 1972-10-13 1974-08-13 Crown Zellerbach Corp Gasification system
EP0514543A1 (fr) * 1990-01-29 1992-11-25 SAKURADA, Yasuyuki Appareil d'epuration des eaux d'egout
GB2291476A (en) * 1994-06-23 1996-01-24 Pontrue Project Services Limit Inducing air flow into water
US5514267A (en) * 1992-05-14 1996-05-07 Idec Izumi Corporation Apparatus for dissolving a gas into and mixing the same with a liquid
EP0839461A1 (fr) * 1996-10-31 1998-05-06 Societe Des Produits Nestle S.A. Procédé et appareil de chauffage, pasteurisation et stérilisation de liquides
EP0854295A1 (fr) * 1997-01-21 1998-07-22 Marine techno Research, Inc. Dispositif pour la stérilisation des zones d'élévage aquatiques à l'aide d'ozone

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3829070A (en) * 1972-10-13 1974-08-13 Crown Zellerbach Corp Gasification system
EP0514543A1 (fr) * 1990-01-29 1992-11-25 SAKURADA, Yasuyuki Appareil d'epuration des eaux d'egout
US5514267A (en) * 1992-05-14 1996-05-07 Idec Izumi Corporation Apparatus for dissolving a gas into and mixing the same with a liquid
GB2291476A (en) * 1994-06-23 1996-01-24 Pontrue Project Services Limit Inducing air flow into water
EP0839461A1 (fr) * 1996-10-31 1998-05-06 Societe Des Produits Nestle S.A. Procédé et appareil de chauffage, pasteurisation et stérilisation de liquides
EP0854295A1 (fr) * 1997-01-21 1998-07-22 Marine techno Research, Inc. Dispositif pour la stérilisation des zones d'élévage aquatiques à l'aide d'ozone

Also Published As

Publication number Publication date
AU4272699A (en) 2000-12-28

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