NZ270453A - Venturi type mixing of gas into liquid via annular gap formed between converging slotted first duct extending into divergent second duct - Google Patents
Venturi type mixing of gas into liquid via annular gap formed between converging slotted first duct extending into divergent second ductInfo
- Publication number
- NZ270453A NZ270453A NZ270453A NZ27045395A NZ270453A NZ 270453 A NZ270453 A NZ 270453A NZ 270453 A NZ270453 A NZ 270453A NZ 27045395 A NZ27045395 A NZ 27045395A NZ 270453 A NZ270453 A NZ 270453A
- Authority
- NZ
- New Zealand
- Prior art keywords
- gas
- liquid
- duct
- annular gap
- section
- Prior art date
Links
- 239000007788 liquid Substances 0.000 title claims description 29
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 22
- 239000007789 gas Substances 0.000 claims description 22
- 239000001301 oxygen Substances 0.000 claims description 22
- 229910052760 oxygen Inorganic materials 0.000 claims description 22
- 239000012530 fluid Substances 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 claims 2
- 230000001419 dependent effect Effects 0.000 claims 1
- 239000010865 sewage Substances 0.000 description 3
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 125000005931 tert-butyloxycarbonyl group Chemical group [H]C([H])([H])C(OC(*)=O)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- 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
-
- 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
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/232—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
- B01F23/2326—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles adding the flowing main component by suction means, e.g. using an ejector
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/237—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
- B01F23/40—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
- B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
- B01F25/3121—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/312—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
- B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
- B01F25/53—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle in which the mixture is discharged from and reintroduced into a receptacle through a recirculation tube, into which an additional component is introduced
-
- 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
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S261/00—Gas and liquid contact apparatus
- Y10S261/75—Flowing liquid aspirates gas
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
Description
<div class="application article clearfix" id="description">
<p class="printTableText" lang="en">2704SJ <br><br>
Patents Form 5 <br><br>
Priority Date (3): l5..\S.f3.y.. <br><br>
. Tiomplcto Specification Filed: <br><br>
class: (6)...jBQlfejsfc;..£0i.6.)<?a; <br><br>
gQiefe <br><br>
"\ibliCcition <br><br>
;:::...Ms <br><br>
N.Z. No. <br><br>
NEW ZEALAND <br><br>
Surrey GU20 6HJ, England, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- <br><br>
- 1 - (Followed by 1A) <br><br>
270453 <br><br>
<MU IlllJlMLP <br><br>
1A <br><br>
GASDfSSOLV/HG <br><br>
The present invention relates to gas dissolving and relates particularly, but not exclusively, to dissolving oxygen in water. <br><br>
In treating sewage, it is often necessary to dissolve large quantities of oxygen in the sewage so as to oxygenate it. Presently known methods include the BOC Group Pic's VITOX™ apparatus as described in British Patent Number 1455567. <br><br>
This apparatus comprises a venturi device having a plurality of small holes provided around the circumference of the throat for the introduction of oxygen into the liquid passing through the venturi. Oxygen is generally provided from a liquid store and the pressure of the released gas is usually over 6 bar(g) and -sufficiently above the 1.8 bar(g) operating pressure of the VITOX™ unit to ensure the oxygen can be introduced into the liquid. Alternatively, one could arrange the venturi such that its operating pressure in the venturi throat is somewhat lower than normal and hence less gas pressure would be required to ensure the oxygen is passed into the liquid. This alternative arrangement is not a preferred one as typically only 80% of the lost liquid pressure is regained by the venturi and hence a large amount of energy has to be expended in liquid pumps to provide the extra pressure. <br><br>
It is an object of the present invention to provide an apparatus for introducing oxygen in a liquid such as sewage which is particularly well suited to operation at low gas pressures without increasing liquid pressures thereby reducing energy wastage and improving efficiency. <br><br>
« <br><br>
Accordingly, the present invention provides an apparatus for introducing a gas into a liquid, said-apparatus comprising a duct formed by a first convergent section and a second divergent section, said first section having a narrow outlet end of smaller diameter than an inlet end of said second section and extending thereinto so as to form an annular gap therebetween, <br><br>
270453 <br><br>
nin ^Hhtfnty ^PODTZU/llvlU <br><br>
2 <br><br>
said first section also including a plurality of axially extending circumferentially spaced slots, and supply means for supplying gas to said annular gap so as to facilitate the mixing of said gas with any fluid passing through said duct, each slot being in flow communication with said supply means so as to facilitate further the introduction of gas into any fluid passing through said duct. <br><br>
Conveniently, the apparatus further includes a plenum chamber for receiving gas to be dissolved in said Jquid and for directing said gas to said annular gap and/or said slols. <br><br>
Advantageously, said plenum chamber comprises a first wall portion extending between said first and second sections and portions of said first and second sections themselves. <br><br>
Conveniently, said first wall portion comprises a right circular tube extending around the entire circumference of said first and second sections. <br><br>
Advantageously, the apparatus further includes a plurality of drain holes in said second portion and extending between said plenum chamber and the interior of said second portion so as to facilitate the draining of liquid and the introduction of gas into liquid in said second portion. <br><br>
In a particularly convenient arrangement said first and/or said second sections comprise truncated cones. <br><br>
In a particularly advantageous arrangement the apparatus further includes a Pressure Swing "Adsorption device connected for supplying oxygen in gaseous form to said annular gap and/or said slots and/or said drain holes. <br><br>
The present invention will now be more particularly described by way of example only with reference to the following drawings, in which: <br><br>
II'I <br><br>
^|M <br><br>
Figure 1 is a general view of an apparatus according to the present invention, and <br><br>
Figure 2 is a cross sectional view of the venturi mixing device illustrated in Figure 1. <br><br>
Referring to Figure 1, an apparatus 10 for dissolving a gas in a liquid comprises a pump 12 for drawing a quantity of liquid 14 from, for example, a storage tank 16 and to a mixing device shown at 18 and best seen in Figure 2. The mixing device 18 comprises a duct 20 formed by a first generally convergent section such as, for example, truncated cones 22 and a second generally divergent section 24. The first section is provided with a narrow ou'.let end 26 of smaller diameter than the inlet end 28 of said second section 24 and extending into said inlet 28 so as to define an annular gap 30 therebetween. A plenum chamber 31 formed by a first wall portion in the form of, for example, right circular tube section 32 extending between said first and second portions 22, 24 and portions of said first and second sections themselves is provided for receiving gas from a source thereof 34 (Figure 1) and for directing it to said annular gap for passage therethrough in a manner to be described in detail later herein. The mixing device 10 may further include a plurality of axially extending circumferentially spaced slots 36 in the first section 22 and/or a plurality of drain holes 38 in the second 24 portion and extending between the plenum chamber 31 and the interior 24a of the second portion 24 for the draining of liquid from said plenum chamber 31 and/or the introduction of gas into liquid in said second portion 24. <br><br>
An oxygen PSA device 34 is linked via a control valve 39 to the mixing device 18 for the supply of oxygen at an unboosted pressure whilst the mixing device itself is positioned at or near the surface S of any liquid contained in tank 16 thereby minimising any hydrostatic head. The water velocity through the venturi and the ratio of area change A/a are selected so as to produce a throat pressure of about 0.6 bar(g). Provided that excessive hydrostatic head is <br><br>
270 4 53 <br><br>
aiiannj'imff <br><br>
4 <br><br>
avoided this pressure is adequate to ensure oxygen gas is drawn directly from the PSA device which operates at a typical output pressure of between 1 to 1.5 bar(g). <br><br>
In operation, pump 12 acts to pump liquid 14 from tank 16 up to the mixing device 18 and pass it therethrough at about 5m/s and about 0.6 bar(g). Since the unboosted PSA device delivers oxygen at between 1 to 1.5 bar(g) there will be sufficient positive oxygen pressure to ensure oxygen is introduced into the periphery of the liquid low and hence mixed therewith for dispersion downstream. __ <br><br>
Certain design features of the above mentioned mixing device are particularly -well suited to low pressure mixing. The annular gap 30, for instance, allows oxygen to be introduced at the periphery of the liquid passing through the device and makes use of the power in the liquid to 'entrain' the oxygen in a manner which allows gas introduction to take place at a lower differential pressure ratio than had previously been thought possible. Additionally, further mixing is guaranteed as the liquid expands in a turbulent manner into the generally divergent section 24. Clearly, because of the lower pressures involved it might be necessary to provide additional passages for the oxygen. Slots 36 are particularly useful as they may be oversized relative to the typical circular holes provided in known mixers. The oversizing is in proportion to the reduction in operating pressure relative to known mixers and allows for a longer 'residency' that is to say a longer contact period between liquid and oxygen. The longer the contact period the greater the chance of oxygen mixing occurring. Drain holes 38 act J:o allow any liquid drained into the plenum chamber 31 to be purged therefrom and may also act to introduce oxygen into the comparatively turbulent downstream divergent zone 24a where further mixing is undertaken. <br><br></p>
</div>
Claims (11)
1. An apparatus for introducing a gas into a liquid, said apparatus comprising a duct formed by a first . convergent section and a second divergent section, said first section having a narrow outlet end of smaller diameter than an inlet end of said second section and extending thereinto so as to form an annular gap therebetween, said first section also including a plurality of axially extending circumferentially spaced slots; and supply means for supplying gas to said annular gap so as to facilitate the mixing of said gas with any fluid passing through said duct, each slot being in flow communication with said supply means so as to facilitate further the introduction of gas into any fluid passing through said duct.<br><br>
2. An apparatus as claimed in Claim 1 further including a plenum chamber for receiving gas to be dissolved in said liquid and for directing said gas to said annular gap and/or said slots.<br><br> i<br><br>
3. An apparatus as claimed in Claim 2 in which said plenum chamber comprises a first wall portion extending between said first and second sections and portions of said first and second sections themselves.<br><br>
4. An apparatus as claimed in Claim 3 in which said first wall portion comprises a right circular tube extending around the entire<br><br> »<br><br> circumference of said first and second sections.<br><br>
5. An apparatus as claimed in any one of Claims 1 to 4 further including a plurality of drain holes in said second portion and extending between said plenum chamber and the interior of said second piortion so as to facilitirtp—<br><br> - - - -<br><br> the draining of liquid and the introduction of gas into liquid in said securer portionf/\<br><br> if^ ***<br><br> |~ ...v,<br><br> V>' * &<br><br> <* £ c<br><br> 270453<br><br> 99^1U/IIVIU<br><br> 6<br><br>
6. An apparatus as claimed In any one of the preceding claims in which said first and/or said second sections comprise truncated cones.<br><br>
7. An apparatus as claimed in any one of the preceding claims further including a Pressure Swing Adsorption device connected for supplying oxygen in gaseous form to said annular gap.<br><br>
8. An apparatus as claimed in any one of the preceding claims, including a Pressure Swing Absorption device connected for supplying oxygen in gaseous form to said slots.<br><br>
9. An apparatus as claimed in claim 6 and any of its dependent claims, including a Pressure Swing Absorption device connected for supplying oxygen in gaseous form to said drain holes.<br><br> _-V • •—.<br><br>
10. An apparatus as_claimed in any one of the preceding claims in which said apparatus is positioned at or about the same level as the surface of any liquid to be treated.<br><br>
11. An apparatus substantially as described herein with reference to and as illustrated in figures 1 to 2 of the accompanying drawings.<br><br> THE BOC GROUP, PLC By Their Attorneys HENR.Y HUGHES Per i<br><br> </p> </div>
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9405000A GB9405000D0 (en) | 1994-03-15 | 1994-03-15 | Gas dissolving |
Publications (1)
Publication Number | Publication Date |
---|---|
NZ270453A true NZ270453A (en) | 1996-06-25 |
Family
ID=10751858
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NZ270453A NZ270453A (en) | 1994-03-15 | 1995-02-03 | Venturi type mixing of gas into liquid via annular gap formed between converging slotted first duct extending into divergent second duct |
Country Status (8)
Country | Link |
---|---|
KR (1) | KR100391858B1 (en) |
AU (1) | AU688831B2 (en) |
DE (1) | DE69502429D1 (en) |
MY (1) | MY116829A (en) |
NZ (1) | NZ270453A (en) |
PH (1) | PH31227A (en) |
TW (1) | TW274058B (en) |
ZA (1) | ZA952136B (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101027660B1 (en) * | 2007-12-06 | 2011-04-12 | (주)엘켐텍 | Highly concentrated oxygen water purifier with electrolytic oxygen dissolving apparatus |
KR101041514B1 (en) * | 2010-04-27 | 2011-06-16 | (주)엘켐텍 | Highly concentrated oxygen water purifier with electrolytic oxygen generator |
ES2951411T3 (en) * | 2018-03-28 | 2023-10-20 | Air Liquide | Apparatus and arrangement for introducing a gas into a primary medium, in particular in wastewater treatment |
KR102262672B1 (en) * | 2019-04-19 | 2021-06-10 | (주)선일 엔바이로 | Water treatment apparatus |
CN111632569B (en) * | 2020-05-24 | 2021-12-28 | 西安交通大学 | Flow corrosion-salt deposition device for supercritical water oxidation reaction coupling |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3900420A (en) * | 1970-05-18 | 1975-08-19 | Felix Sebba | Microgas emulsions and method of forming same |
DE3008476A1 (en) * | 1980-03-05 | 1981-09-17 | Bayer Ag, 5090 Leverkusen | METHOD FOR FLOTATION AND USE OF FUNNEL NOZZLES FOR FLOTATION |
DE3008589A1 (en) * | 1980-03-06 | 1981-09-10 | Bayer Ag, 5090 Leverkusen | MECHANICAL FOAM DESTROYER AND METHOD FOR MECHANICAL FOAM DESTROYER |
US4643743A (en) * | 1983-02-10 | 1987-02-17 | Union Carbide Corporation | Pressure swing adsorption process for supplying oxygen under variable demand conditions |
-
1995
- 1995-02-03 NZ NZ270453A patent/NZ270453A/en unknown
- 1995-02-03 PH PH49892A patent/PH31227A/en unknown
- 1995-02-16 MY MYPI95000393A patent/MY116829A/en unknown
- 1995-02-17 AU AU12314/95A patent/AU688831B2/en not_active Ceased
- 1995-02-17 TW TW084101466A patent/TW274058B/zh not_active IP Right Cessation
- 1995-03-10 DE DE69502429T patent/DE69502429D1/en not_active Expired - Lifetime
- 1995-03-14 KR KR1019950005219A patent/KR100391858B1/en not_active IP Right Cessation
- 1995-03-15 ZA ZA952136A patent/ZA952136B/en unknown
Also Published As
Publication number | Publication date |
---|---|
KR950031934A (en) | 1995-12-20 |
AU1231495A (en) | 1995-09-21 |
DE69502429D1 (en) | 1998-06-18 |
TW274058B (en) | 1996-04-11 |
AU688831B2 (en) | 1998-03-19 |
MY116829A (en) | 2004-04-30 |
PH31227A (en) | 1998-05-12 |
KR100391858B1 (en) | 2004-01-24 |
ZA952136B (en) | 1995-12-18 |
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