AU657021B2 - Treatment of liquids - Google Patents
Treatment of liquids Download PDFInfo
- Publication number
- AU657021B2 AU657021B2 AU30343/92A AU3034392A AU657021B2 AU 657021 B2 AU657021 B2 AU 657021B2 AU 30343/92 A AU30343/92 A AU 30343/92A AU 3034392 A AU3034392 A AU 3034392A AU 657021 B2 AU657021 B2 AU 657021B2
- Authority
- AU
- Australia
- Prior art keywords
- liquid
- nozzle
- passageway
- stream
- divergent
- 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
Links
- 239000007788 liquid Substances 0.000 title claims description 33
- 239000007789 gas Substances 0.000 claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 13
- 239000001301 oxygen Substances 0.000 claims description 13
- 229910052760 oxygen Inorganic materials 0.000 claims description 13
- 239000002699 waste material Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 239000002991 molded plastic Substances 0.000 claims description 3
- 239000003643 water by type Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 description 13
- 239000010865 sewage Substances 0.000 description 6
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- -1 for example Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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
- B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
- B01F23/2376—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media characterised by the gas being introduced
- B01F23/23761—Aerating, i.e. introducing oxygen containing gas in liquids
- B01F23/237612—Oxygen
-
- 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
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23121—Diffusers having injection means, e.g. nozzles with circumferential outlet
-
- 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
- B01F2025/91—Direction of flow or arrangement of feed and discharge openings
- B01F2025/919—Direction of flow or arrangement of feed and discharge openings characterised by the disposition of the feed and discharge openings
- B01F2025/9191—Direction of flow or arrangement of feed and discharge openings characterised by the disposition of the feed and discharge openings characterised by the arrangement of the feed openings for one or more flows, e.g. for the mainflow and the flow of an additional component
- B01F2025/91912—Direction of flow or arrangement of feed and discharge openings characterised by the disposition of the feed and discharge openings characterised by the arrangement of the feed openings for one or more flows, e.g. for the mainflow and the flow of an additional component with feed openings at the circumference of the main flow
- B01F2025/919121—Direction of flow or arrangement of feed and discharge openings characterised by the disposition of the feed and discharge openings characterised by the arrangement of the feed openings for one or more flows, e.g. for the mainflow and the flow of an additional component with feed openings at the circumference of the main flow with feed openings around the complete circumference of the main flow, e.g. being a perforated or porous part
-
- 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
- B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
- B01F23/2376—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media characterised by the gas being introduced
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
Description
r-2 1
AUSTRALIA
PATENTS ACT 1990 COMPTL TE SPECIFICATION FOR A STANDARD PATENT rg *r Ir r
''I
IfI
ORIGINAL
f-t c
I
'i I; Name of Applicant: Actual Inventor: Address for Service: Invention Title: THE BOC GROUP plc Michael Ernest Garrett SHELSTON WATERS Clarence Street SYDNEY NSW 2000 "TREATMENT OF LIQUIDS" The following statement is a full description of this invention, including the best method of performing it known to us:la TREATMENT OF LIQUIDS The present invention relates to apparatus for dissolving oxygen in a volume of liquid and more particularly to nozzles for use in such apparatus.
For the avoidance of doubt, throughout this specification the term "gas" is intended to include gas mixtures.
In our European Patent Application, Publication No. 0389230, there is described a method of treating a large volume of liquid contained in a sewage treatment tank. A sewage pump forms a stream of the waste liquid and passes said liquid through a ring main. Depending ,i vertically fro the ring main are a plurality of conduits each conduit having located at its upper end a 15 venturi. Each venturi has an inlet for gaseous oxygen.
"At the lower end of each conduit downstream of the venturi is a T-piece pipe in which is received one or more outlet nozzles for passing a liquid-gas mixture into the main volume of liquid in the sewage treatment tank.
Each venturi creates a restriction in its associate conduit whereby turbulence is imparted to the liquid flowing therethrough. The flow of oxygen to the turbulent region from the inlet of the venturi breaks the oxygen into small bubbles. The liquid-gas mixture passes down the conduit and through a nozzle which has an outlet diameter much smaller than that of the diameter of the associated conduit such that the liquid-gas mixture leaves the nozzle at a relatively high velocity thereby creating turbulence and helping further to break up or sheer bubbles in the liquid-gas mixture to even smaller bubbles that are readily dissolved in the main body of the liquid in the sewage treatment tank.
It is an aim of the present invention to provide an improved nozzle for use in apparatus of the type described in European Publication No. 0389230 which b avuids the need for an independent venturi.
According to the present invention, an apparatus to dissolve oxygen in a stream of waste liquid comprises a pump for passing the liquid through a plurality of conduits, each conduit terminating in a nozzle, each It It 'i c t 1S 4 1 IA 2 cl -2having a passageway for the flow therethrough of a stream of said liquid, in which said passageway comprises a first convergent portion, a second parallel portion downstream of the first portion and a third divergent portion downstream of the second portion and means defining an annular gas passage communicating with the passageway at a location along the second parallel portion, wherein each nozzle comprises an outer first part which defines the third divergent portion and a inner second part secured within the outer first part and which defines the first convergent and second parallel portions.
Preferably, the gas passage is located at or adjacent to the root of the third divergent portion.
In a preferred embodiment the nozzle comprises two S.i, 15 parts, an outer part which defines the third divergent I, portion and an inner part secured within the outer part which defines the first convergent and second parallel portions.
Each part may be made of moulded plastics material.
An embodiment of the invention will now be t, described, by way of example, reference being made to the tii 4Figures of the accompanying diagrammatic drawings in which: ,Figure 1 is a schematic drawing, partly in perspective of an oxygenation apparatus as described in 25 European Patent Application Publication No. 0389230; and Figure 2 is a vertical cross-section through nozzle of the present invention for use in an apparatus of the type as described in European Publication No. 0389230.
Referring first to Figure 1, the illustrated apparatus may be located wholly within a large volume of liquid, for example, liquid contained within a sewage treatment tank. A sewage pump 2 having a suction inlet forms a stream of waste water which enters a ring main 4.
The ring main 4 is adapted to feed the liquid to a plurality of conduits 6 which depend generally vertically therefrom. Each conduit 6 has a venturi 8 disposed 3 therein. Each venturi 8 has an inlet 10 for gaseous oxygen. Each conduit 6 has a downstream T-piece pipe 13 at its bottom end in which is received one or more outlet nozzles 12 for passing a liquid gas mixture into the main volume of liquid in which the ring main is immersed.
3 5 As explained in European Patent Application Publication No. 0389230, each venturi 8 creates a restriction in its associated conduit 6 such that turbulence is imparted to the liquid flowing through the conduit 6. The flow of oxygen to the turbulent region from the inlet 10 breaks the oxygen into bubbles.
10 Each nozzle 12 has an outlet diameter much smaller than the diameter of the associated conduit 6 such that the liquid-gas mixture leaves the nozzle 12 at a relatively high velocity thereby creating turbulence, helping further to break up or sheer bubbles in the mixture into even smaller bubbles that are readily dissolved in the main body of liquid.
It will be evident that the apparatus described in European Publication No.
0389230 requires with each conduit 6 a separate venturi 8 and one or more nozzles 12.
Referring now to Figure 2, this illustrates a nozzle 20 which is intended for use in an apparatus for dissolving gas in a volume of liquid of the S11 type described in European Patent Publication No. 0389230 and which obviates the need of a venturi.
The nozzle 20 comprises an outer part 22 within which is securely attached an inner part 24. Both parts 22, 24 may be made of moulded plastics material. The nozzle 20 has a central passageway 26 for the flow therethrough of a stream of liquid from left to right (as shown). The passageway 26 comprises a first convergent portion 28 and downstream therefrom a second parallel portion 30 both defined by the inner part 24; and a third divergent portion 32 downstream of the second parallel portion said portion 32 being defined by the outer part 22. The outer part 22 is formed with an inlet 34 for gas, for example, oxygen and opposing
I
4 surfaces 36, 38 of the inner part 24 and 40, 42 of the outer part 22 defined between them means in the form of an annular passage 44 which communicates with the passageway 26 at a location along the second parallel portion 30 adjacent the root of the third divergent portion 32.
It will be apparent, that the nozzle 20 is intended for attachment either directly to a conduit 6 or a T-piece pipe 13 of the type illustrated in Figure 1.
In use, oxygen passes through inlet 34 and annular passage 44 and is injected into the liquid passing through passageway 26 near the root of the third divergent section 32 aid the liquid-oxygen mixture leaves the nozzle at a velocity which exceeds the sonic velocity for the mixture thereby n creating shock waves in the main body of liquid.
*.te Use of the nozzle 20 in an apparatus of the type as illustrated in Figure 1 avoids the need, cost and pressure drop associated with a venturi and since conduit 6 no longer conveys a gas-liquid mixture the velocity of the liquid can be reduced resulting in the pressure drop associated with the conduit being reduced by 25% when compared with the apparatus as illustrated in Figure 1. The net benefit will be to halve the power consumption required to operate the apparatus illustrated in Figure 1.
*5 t 20 Modifications can be made to the embodiment illustrated in Figure 2 in that the passage 44 need not communicate with the passageway 26 immediately adjacent the third divergent portion 32 but may be located anywhere along the second parallel portion Furthermore, a plurality of shallow vanes can be formed on the surface of the third divergent portion 32 to impart a rotating motion to the liquidoxygen mixture leaving the nozzle 20. The vanes can be moulded as a spiral or long pitch thread to the surface of the L.vergent portion 32. Rotary motion of the liquid-oxygen mixture as it leaves the nozzle 20 helps with dispersion and mixing.
A- i
Claims (6)
1. A:-A apparatus to dissolve oxygen in a stream of waste liquid comprising a pump for passing the liquid through a plurality of conduits, each conduit terminating in a nozzle, each nozzle having a passageway for the flow therethrough of a stream of said liquid, in which said passageway comprises a first convergent portion, a second parallel portion downstream of the first portion and a third divergent portion downstream of the second portion and means defining an annular gas passage communicating with the passageway at a location along the second parallel portion, wherein each nozzle comprises an outer first part which defines the third divergent portion and a inner second part secured within 15 the outer first part and which defines the first convergent and second parallel portions.
2. An apparatus as claimed in claim 1, in which the gas passage is located at or adjacent the root of third divergent portion. 20
3. An apparatus as claimed in claim 1, in which the passage is defined, at least in part, by opposed, spaced surfaces of the first and second parts.
4. An apparatus as claimed in claim 3, in which each part is made of moulded plastics material.
5. An apparatus to dissolve oxygen in a stream of waste liquid substantially as herein described with reference to the accompanying drawings.
6. In an apparatus to dissolve oxygen in a stream of waste liquid, a nozzle constructed and arranged substantially as hereinbefore described with reference to Figure 2 of the accompanying drawings. DATED this 25th day of November, 1994 TEHE BOC GROUP plc Attorney: CAROLINE M. BOMMER Fellow Institute of Patent Attorneys of Australia of SHELSTON WATERS -6- ABSTRACT A nozzle(20)for use in apparatus for dissolving gas in a volume of liquid comprises a through passageway(26)for the liquid having a first convergent portion a second parallel portion (30)and a third divergent portion(32). A gas passage (44) is in communication with the passageway(26)at a location along the second parallel portion(20). An advantage of the nozzle that it obviates the need of a separate venturi. t I: I ii
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9201193 | 1992-01-21 | ||
| GB929201193A GB9201193D0 (en) | 1992-01-21 | 1992-01-21 | Treatment of liquids |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU3034392A AU3034392A (en) | 1993-07-22 |
| AU657021B2 true AU657021B2 (en) | 1995-02-23 |
Family
ID=10708927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU30343/92A Ceased AU657021B2 (en) | 1992-01-21 | 1992-12-22 | Treatment of liquids |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0602762B1 (en) |
| AU (1) | AU657021B2 (en) |
| DE (1) | DE69306923T2 (en) |
| GB (1) | GB9201193D0 (en) |
| NZ (1) | NZ245677A (en) |
| PL (1) | PL169306B1 (en) |
| ZA (1) | ZA93348B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU1059795A (en) * | 1993-11-26 | 1995-06-13 | Hyperno Proprietary Limited | Chemical waste treatment |
| DE10228853B4 (en) * | 2002-06-27 | 2007-02-08 | Esau & Hueber Gmbh | Nozzle arrangement for introducing gas into a liquid |
| CN108786513A (en) * | 2018-06-19 | 2018-11-13 | 中国海洋石油集团有限公司 | A kind of salt water tank mixing arrangement |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU515688B2 (en) * | 1976-03-05 | 1981-04-16 | Moore Business Forms Ltd. | Continuous stationery |
| AU7301391A (en) * | 1990-02-12 | 1991-09-03 | Sven Johansson | Nozzle device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1068223B (en) * | 1959-11-05 | Ernst Schlick, Coburg (Bay.) | Device for ventilating or gassing liquids that flow through an injector charged with air or gas | |
| FR2612084B1 (en) * | 1987-03-12 | 1991-03-29 | Djet Sarl | DEVICE FOR THE DOSED INJECTION OF AN ADJUVANT INTO A FLOW OF LIQUID |
| GB8906483D0 (en) * | 1989-03-21 | 1989-05-04 | Boc Group Plc | Dissolution of gas |
-
1992
- 1992-01-21 GB GB929201193A patent/GB9201193D0/en active Pending
- 1992-12-22 AU AU30343/92A patent/AU657021B2/en not_active Ceased
-
1993
- 1993-01-08 DE DE69306923T patent/DE69306923T2/en not_active Expired - Lifetime
- 1993-01-08 EP EP93300117A patent/EP0602762B1/en not_active Expired - Lifetime
- 1993-01-14 NZ NZ245677A patent/NZ245677A/en not_active IP Right Cessation
- 1993-01-19 ZA ZA93348A patent/ZA93348B/en unknown
- 1993-01-20 PL PL93297470A patent/PL169306B1/en not_active IP Right Cessation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU515688B2 (en) * | 1976-03-05 | 1981-04-16 | Moore Business Forms Ltd. | Continuous stationery |
| AU7301391A (en) * | 1990-02-12 | 1991-09-03 | Sven Johansson | Nozzle device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9201193D0 (en) | 1992-03-11 |
| EP0602762B1 (en) | 1996-12-27 |
| PL297470A1 (en) | 1993-08-23 |
| NZ245677A (en) | 1994-06-27 |
| PL169306B1 (en) | 1996-06-28 |
| DE69306923T2 (en) | 1997-05-07 |
| ZA93348B (en) | 1993-08-25 |
| DE69306923D1 (en) | 1997-02-06 |
| EP0602762A1 (en) | 1994-06-22 |
| AU3034392A (en) | 1993-07-22 |
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