WO2017124128A1 - Ajutage d'aération et de mélange - Google Patents

Ajutage d'aération et de mélange Download PDF

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Publication number
WO2017124128A1
WO2017124128A1 PCT/AU2016/000007 AU2016000007W WO2017124128A1 WO 2017124128 A1 WO2017124128 A1 WO 2017124128A1 AU 2016000007 W AU2016000007 W AU 2016000007W WO 2017124128 A1 WO2017124128 A1 WO 2017124128A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
fluid
shaped stage
stage
convergent
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/AU2016/000007
Other languages
English (en)
Inventor
Eduardo Andres Rivera OLIVOS
Brent Adrian MARTIN
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.)
Waterwerx Pty Ltd
Original Assignee
Waterwerx Pty Ltd
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 Waterwerx Pty Ltd filed Critical Waterwerx Pty Ltd
Priority to PCT/AU2016/000007 priority Critical patent/WO2017124128A1/fr
Publication of WO2017124128A1 publication Critical patent/WO2017124128A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1278—Provisions for mixing or aeration of the mixed liquor
    • C02F3/1294—"Venturi" aeration means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • 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
    • B01F23/2323—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 by circulating the flow in guiding constructions or conduits
    • B01F23/23231—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 by circulating the flow in guiding constructions or conduits being at least partially immersed in the liquid, e.g. in a closed circuit
    • 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
    • B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
    • B01F25/21—Jet mixers, i.e. mixers using high-speed fluid streams with submerged injectors, e.g. nozzles, for injecting high-pressure jets into a large volume or into mixing chambers
    • B01F25/211—Jet mixers, i.e. mixers using high-speed fluid streams with submerged injectors, e.g. nozzles, for injecting high-pressure jets into a large volume or into mixing chambers the injectors being surrounded by guiding tubes
    • 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
    • B01F25/3123—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with two or more Venturi elements
    • B01F25/31232—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with two or more Venturi elements used simultaneously
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to an improved jet nozzle suitable for aspirating or mixing multi-component substances.
  • Waste liquid streams including, but not limited to, industrial waste, contaminated waste water and sewage are commonly treated before discharge into the environment.
  • this treatment involves placing the liquid into pondage or tanks to allow the consumption of the organic material by aerobic bacteria.
  • aerobic bacteria For the aerobic bacteria to live in this liquid body, it is often necessary to introduce oxygen into the liquid by aeration. If there is insufficient oxygen in the liquid, then anaerobic bacteria may develop leading to unwanted odours.
  • One method of aeration uses surface mounted mechanical aerators that physically mix liquid and air at the free surface.
  • the disadvantages of mechanical aerators include that they typically only provide aeration at the free surface limiting the gas enrichment of the liquid body, and they use moving parts, reducing their reliability and increasing susceptibility to wear and tear.
  • Jet aeration is considered generally to be more energy efficient than diffusion or surface aeration. Jet aeration systems operate by pumping the waste water through submerged nozzles or tubes with openings through which air or other gas is entrained or pumped into the tubes to create turbulent mixing with the waste water by means of the Venturi principle. This aspirating technology simultaneously moves large volumes of high kinetic energy liquid and air through one or more jet nozzles. The high velocity liquid exits the inner, primary jet and rapidly mixes with the incoming air in the outer jet. This intense mixing and the high degree of turbulence in the gas/liquid cloud that travels outward from the jet along the basin floor leads to significant amounts of oxygen being dissolved into the liquid prior to the vertical rise of the gas bubble column to the liquid surface.
  • US patent no 4,210,534 (Molvar) describes an improved system for mixing a gas such as oxygen or air with waste water in a body of waste water.
  • Molvar describes a multiple stage nozzle system that increases the amount of gas dissolved into the liquid stream with little increase in the power increasing the efficiency of the overall system.
  • the more efficient aeration systems maximise the time the aerating gas is in contact with the liquid so that the deeper the placement of the aeration system in the vessel, the more efficient the system.
  • increasing the depth of the aeration system in the liquid vessel has a significant impact on the cost and power of the aeration pump or blower supplying the aerating gas, that is, the deeper the system, the larger the pump required. Accordingly, there is a need for a jet aeration system which minimises its reliance on an aeration pump or blower or reduces the size of the pump required.
  • the present invention relates to an improved jet nozzle suitable for the purpose of aspirating and/or mixing multi-component substances. For example, by introducing gas or liquid sampled at the free surface or any other depth of the liquid body intermediate the surface and the nozzle and combining it with liquid at the nozzle depth.
  • the nozzle of the invention depending on the application, is not reliant on an aeration pump or blower (ie is self-aspirating) or is able to achieve similar results to existing systems using a smaller pump than that used in existing systems.
  • a multiple stage jet nozzle comprising:
  • a first nozzle-shaped stage comprising a convergent outlet which discharges a first fluid, wherein the convergent outlet has an internal taper in the range of from 15 to 20 degrees with a reduction of cross-sectional area over the taper of between 40 and 60%;
  • the multiple stage jet nozzle is suitable for use in aspiration systems and systems for mixing a multi-component substance to maintain or improve its homogeneity (eg liquids and suspended solids).
  • a system for aspirating a first fluid body with a second fluid comprising at least one multiple stage jet nozzle according to the invention.
  • a system for mixing a multi-component substance to maintain or improve its homogeneity comprising at least one multiple stage jet nozzle according to the invention.
  • a system for perfusing a first fluid body with a second fluid comprising at least one multiple stage jet nozzle according to the invention.
  • the system comprises a plurality of multiple stage jet nozzles according to the invention.
  • the exit diameter is in the range of 10mm to 20mm.
  • the exit diameter is 14mm.
  • the geometry of a preferred embodiment of present invention enables the multiple stage jet nozzle to operate without the need for a pump to introduce the second fluid (gas or another liquid mixture) into the nozzle under pressure.
  • the second fluid enters the multiple stage jet nozzle by means of a connecting pipe terminating at a fixed point above or floating on the free surface for aeration systems, or terminating at a point in connection with the second liquid mixture for mixing systems.
  • the velocity of the first fluid is accelerated, lowering the pressure, and creating a zone of low pressure in the mixing chamber.
  • the low pressure zone causes the second fluid to be drawn down through the annular passage into the mixing chamber.
  • the first fluid and second fluid are combined into a liquid jet (containing fine bubbles in the case of aeration) which shoots through the second nozzle-shaped stage.
  • a liquid jet containing fine bubbles in the case of aeration
  • This drawing of a second fluid (whether gas or liquid) by suction into a vessel containing a first fluid is referred to as "aspiration".
  • the advantage of this invention over the prior art is that it allows the use of a smaller pump for the second fluid, and in some embodiments elimination of the pump (or blower) entirely, with a reduction in capital cost and reduced system complexity. For example,
  • blower or pump may be used which would be smaller and at a lower cost than the pumps required to achieve the same rate of aspiration in a prior art system.
  • the blower or smaller pump can also allow for easier maintenance and replacement compared with the larger pumps required for use with prior art systems;
  • a blower or smaller pump may be used to increase the air flow rate, which would be smaller and at a lower cost than the pumps required to operate a prior art system at the same depth.
  • Figure 1 shows a representation of an aspirating system according to the prior art.
  • Figure 2 shows a sectional view of a multi stage jet nozzle according to one embodiment of the present invention.
  • Figure 3 shows a perspective view of a multi stage jet nozzle according to an embodiment of the present invention.
  • Figure 4 shows a second view of the multi stage jet nozzle of Figure 3.
  • Figure 5 shows a tank containing an aeration system that includes a number multi stage jet nozzles according to an embodiment of the present invention.
  • Figure 6 shows a top view of the tank of Figure 5.
  • Figure 7 shows a side view of the tank of Figure 5.
  • Nozzle configurations in the prior art may appear similar to the present invention in structure, but to date none has proven to be self-aspirating and they all necessarily require a pump, fan, or blower to supply air under pressure to the nozzle assembly.
  • a nozzle was prepared according to the description in Molvar and was determined to not be self-aspirating. To be used in an aspirating system, a nozzle according to Molvar needs to be used with a pump for the second fluid which is similar to pumps used in existing systems.
  • Figure 2 shows a sectional view of a preferred embodiment of a multistage self- aspirating nozzle of the present invention.
  • the nozzle 20 in Figure 2 comprises a first nozzle-shaped stage 13 and a second nozzle-shaped stage 16 mounted inside an outer housing 14.
  • the first nozzle-shaped stage 13 comprises a substantially parallel bore terminating in a convergent outlet 11 having an exit diameter D.
  • the taper of the convergent outlet 11 of the first nozzle-shaped stage is typically in the range of 15 to 20 degrees to reduce the cross-sectional diameter from 2D to the exit diameter D over a streamwise distance of 2D.
  • the wall thickness of the first nozzle- shaped stage 13 is such that both the internal and external diameters of the nozzle taper concurrently.
  • the placement of the first nozzle-shaped stage 13 and second nozzle-shaped stage 16 is such that each is coaxial with the streamwise axis of the assembly.
  • the relative diameters of the outer housing 14 and the first nozzle-shaped stage 13 are such that they form a divergent annular duct 15 becoming thereafter parallel at the exit of the convergent outlet 11 until the inlet to the second nozzle-shaped stage 16 is encountered.
  • the second nozzle- shaped stage 16 has a tapered inlet with a typical included angle of 110 degrees, and a substantially parallel bore having an internal diameter substantially equivalent to D, with a length ranging from 2 to 3 times D but typically about 2.5D.
  • the exit diameter of the first nozzle-shaped stage 13 and the internal bore of the second nozzle-shaped stage 16 are typically of substantially the same diameter D.
  • the first nozzle-shaped stage 13 creates a convergent mixing chamber 17.
  • the separation of the exit from the first nozzle-shaped stage 13 to the entrance to the substantially parallel bore of the second nozzle-shaped stage 16 is between 1 and 2 times the exit diameter D, typically about 1.5D.
  • a primary fluid A to be aerated or mixed is supplied under pressure (for example, using a pump (not shown) to the first nozzle-shaped stage 13 through the inlet 10 and then passes through the convergent outlet 11 at an increased velocity (compared with its entry velocity).
  • the accelerated velocity of primary fluid A creates a low pressure zone (reduced static pressure) in mixing chamber 17.
  • This low pressure zone draws the second fluid B into the mixing chamber 17 via the annular duct 15 (and inlet 12) and mixing of the two fluid streams entails.
  • This second fluid B will be drawn into the mixing chamber 17 by entrainment (ie drawn in due to the low pressure zone), or supplied under pressure by means including but not limited to a pump, blower or fan.
  • Turbulent mixing results in dispersion of second fluid B in the primary fluid A stream.
  • the resulting fluid jet enters the second nozzle-shaped stage 16 where further turbulent mixing and shearing of the fluid boundaries occurs enabling more complete mixing in the case of two liquids, and a greater dispersion of smaller bubbles where the secondary fluid is a gas.
  • the mixed fluid then exits the nozzle through outlet 18.
  • Diameter D is generally in the range of 10mm to 20mm. In a preferred embodiment, D is 14mm.
  • the particular relative proportions of the present invention, as shown in Figure 2 in relation to a preferred embodiment, are important to achieve the self-aspiration of the present invention, which is absent from similar nozzles such as those disclosed in Molvar.
  • the nozzle according to the invention may be located at any level in the primary fluid but for reasons of optimising the interaction between the primary fluid and secondary fluid would commonly be located at the bottom of the tank, as shown in Figures 5 and 7. Due to the self-aspirating nature of a preferred embodiment, the supply of secondary fluid may be drawn via a pipe connected to the inlet 12 with the distal, sampling end located at any desired location in the fluid, above the fluid, or at the free surface acting as a skimmer. When located at the free surface, common practice would be to suspend the sampling point on the free surface by means of a floatation device.
  • nozzles 20 are attached to an aeration system 21 in a tank 22 in a preferred embodiment of the present invention.
  • the primary fluid A is drawn into the aeration system 21 via system inlet 23, which may be above or below the level of fluid in the tank 22.
  • the nozzles 20 may alternatively be used in any self-aspirating system.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)

Abstract

L'invention concerne un ajutage à étages multiples adapté à être utilisé dans des systèmes d'aspiration.
PCT/AU2016/000007 2016-01-20 2016-01-20 Ajutage d'aération et de mélange Ceased WO2017124128A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/AU2016/000007 WO2017124128A1 (fr) 2016-01-20 2016-01-20 Ajutage d'aération et de mélange

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/AU2016/000007 WO2017124128A1 (fr) 2016-01-20 2016-01-20 Ajutage d'aération et de mélange

Publications (1)

Publication Number Publication Date
WO2017124128A1 true WO2017124128A1 (fr) 2017-07-27

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Family Applications (1)

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PCT/AU2016/000007 Ceased WO2017124128A1 (fr) 2016-01-20 2016-01-20 Ajutage d'aération et de mélange

Country Status (1)

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WO (1) WO2017124128A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020118092A1 (fr) * 2018-12-06 2020-06-11 Schlumberger Technology Corporation Système d'injection de désémulsifiant
CN115463600A (zh) * 2022-10-18 2022-12-13 安徽理工大学 一种药剂与矿浆高效混合调浆装置及方法
CN118217830A (zh) * 2024-05-20 2024-06-21 中南大学 一种振荡旋流微纳米气泡发生器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB802691A (en) * 1955-10-26 1958-10-08 Gaskell & Chambers Ltd Liquids mixing device
US6682057B2 (en) * 2001-05-01 2004-01-27 Estr, Inc. Aerator and wastewater treatment system
US6986506B2 (en) * 2003-05-01 2006-01-17 Chapman Teddie C Water aerator and method of using same
CN203525582U (zh) * 2013-10-23 2014-04-09 上海宝闵工业气体有限公司 一种可调式射流混合器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB802691A (en) * 1955-10-26 1958-10-08 Gaskell & Chambers Ltd Liquids mixing device
US6682057B2 (en) * 2001-05-01 2004-01-27 Estr, Inc. Aerator and wastewater treatment system
US6986506B2 (en) * 2003-05-01 2006-01-17 Chapman Teddie C Water aerator and method of using same
CN203525582U (zh) * 2013-10-23 2014-04-09 上海宝闵工业气体有限公司 一种可调式射流混合器

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020118092A1 (fr) * 2018-12-06 2020-06-11 Schlumberger Technology Corporation Système d'injection de désémulsifiant
CN115463600A (zh) * 2022-10-18 2022-12-13 安徽理工大学 一种药剂与矿浆高效混合调浆装置及方法
CN115463600B (zh) * 2022-10-18 2023-07-21 安徽理工大学 一种药剂与矿浆高效混合调浆装置及方法
CN118217830A (zh) * 2024-05-20 2024-06-21 中南大学 一种振荡旋流微纳米气泡发生器

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