EP0198073A1 - Dispositif d'introduction d'un gaz dans un liquide. - Google Patents

Dispositif d'introduction d'un gaz dans un liquide.

Info

Publication number
EP0198073A1
EP0198073A1 EP85905619A EP85905619A EP0198073A1 EP 0198073 A1 EP0198073 A1 EP 0198073A1 EP 85905619 A EP85905619 A EP 85905619A EP 85905619 A EP85905619 A EP 85905619A EP 0198073 A1 EP0198073 A1 EP 0198073A1
Authority
EP
European Patent Office
Prior art keywords
liquid
annular gap
chamber
diffuser
air
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.)
Granted
Application number
EP85905619A
Other languages
German (de)
English (en)
Other versions
EP0198073B1 (fr
Inventor
Hans-Otto Schwarze
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.)
HOSCH FORDERTECHNIK GmbH
Original Assignee
HOSCH FORDERTECHNIK GmbH
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 HOSCH FORDERTECHNIK GmbH filed Critical HOSCH FORDERTECHNIK GmbH
Publication of EP0198073A1 publication Critical patent/EP0198073A1/fr
Application granted granted Critical
Publication of EP0198073B1 publication Critical patent/EP0198073B1/fr
Expired 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
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/305—Injector mixers the additional component being axially fed and radially discharged through a circumferential outlet
    • 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

Definitions

  • the invention relates to a device for the continuous introduction of a gas, in particular air, into a liquid, in particular water, for water activation, treatment, flotation, deinking or the like, with a liquid nozzle, including one or more gas outlet openings downstream of the nozzle of the respective supply lines and a diffuser downstream of the gas outlet openings.
  • DE-OS 30 15 788 discloses a gassing device of the type mentioned above in the course of a flotation device.
  • the actual device consists of an essentially cuboid housing with a flat nozzle, a series of air inlet openings and a flat diffuser with inherently flat boundary surfaces.
  • the liquid of the flotation chamber which is circular in cross section, being given a swirl by inclining the gassing devices.
  • the flat nozzle shape was primarily chosen to counteract the blockage of fibers and the like previously observed in round nozzles.
  • the invention proposes that the liquid nozzle be designed as an essentially circular annular gap with a horizontally extending central plane and the gas outlet openings as circular openings each opening above and below the annular gap, and that the diffuser each consist of two opposing boundary surfaces both sides of the emerging from the annular gap
  • the device according to the invention is therefore equipped with an endless ring nozzle in which there is no side limitation in the form of an end wall or the like.
  • a radial diffuser as used in the invention, there is a natural widening on the current path from the inside to the outside, irrespective of the upper and lower boundary surfaces, which results from the increase in diameter and the associated increase in the peripheral surface . It has been shown that - j . a diffuser of this type only realizes the desired conversion of speed into pressure with the lowest possible losses if the overall expansion corresponds to that of a circular diffuser with an opening angle of 2 ° to 6 °. In view of this requirement, a wide variety of configurations for the upper and lower boundary surfaces can arise.
  • a typical device according to the invention is designed in such a way that the annular gap has a clear width of 5 mm, the speed at which the liquid emerges from the annular gap is approximately 12-13 mm / s and a sufficient flow rate at the outlet of the diffuser at a liquid height of approx. 1.5 to 2 mm. is present in the treatment pool.
  • the latter parameter has proven to be favorable for flotations and treatment tanks of all kinds. With a clear width of 5 mm for the annular gap there is sufficient security against clogging of the annular gap.
  • the device according to the invention is generally arranged in the center of a basin with a circular cross section in the vicinity of the floor. If there is to be a slight swirl flow within the basin, low-resistance spacer webs can be arranged between the boundary surfaces of the diffuser, which are slightly curved and cause the swirl to a sufficient extent. With a correspondingly full design of the spacer webs, they can be used, with or without curvature, to supply the air chamber below with air from the air chamber above, a pipe leading to the air chamber above, the free end of which extends above the liquid level located in the assigned treatment pool. In deviation from this, the lower air chamber can also be supplied from the upper air chamber by separate pipes or by connecting lines outside the device.
  • the supply of one air chamber from the other air chamber, which is provided with a supply line, can also take place directly via the air outlet openings.
  • the ring nozzle is then closed at predetermined points by spacers or fastening pieces, behind which a liquid-free area is formed in the flow shadow, which area is used for the overflow of the gas from one chamber to the other.
  • spacers or fastening pieces evenly distributed around the circumference are sufficient to produce these overflow areas. If necessary, the width can be varied in the circumferential direction of the annular gap.
  • the supply of the liquid to the annular gap should be designed with particular care since, with the correct shape, considerable savings in running operating costs can be achieved.
  • Particularly advantageous conditions result when the annular gap forms the outlet of a chamber, to the top of which the feed line for the liquid is connected, and the cross section of which is monotonically narrowed on the way from the feed line to the annular gap. This is equivalent to the fact that the liquid is continuously accelerated, since the respective effective flow cross section from the inlet to the annular gap becomes smaller without a jump and without widening to a previous level.
  • the annular gap finally forms the narrowest point from which the liquid emerges at high speed.
  • a supply of the liquid from both sides from below and from above can also be provided.
  • the annular gap then lies in the center of a channel which is formed by the two liquid inlets.
  • the last section of each inlet up to the annular gap can again be designed as a monotonic narrowing so that the liquid is accelerated uniformly and emerges from the annular gap at high speed.
  • the type of arrangement of the liquid supply must of course be the same pressure in both supply lines so that one liquid column can be "supported" on the other.
  • the inlet of the diffuser is designed to be significantly larger in cross section than the annular gap.
  • the suction force of the liquid emerging from the annular gap is sufficient to automatically suck up the air chambers that have filled up through the openings after the rest periods.
  • FIG. 1 shows a cross-sectional view through a device according to the invention for small and medium liquid throughput quantities
  • FIG. 2 shows a view according to FIG. 1 of a further exemplary embodiment of the invention for a very large throughput
  • FIG. 3 shows the detail of a sectional view according to line III-III in FIG. 2,
  • FIG. 4 shows a view according to FIG. 1 of a further exemplary embodiment of the invention with a liquid supply line on the top and on the bottom and ⁇
  • FIG. 5 shows a cross-sectional view along the line V - V in FIG. 4 as a section to illustrate the formation of gas transfer areas from one chamber to the other.
  • the device according to the invention shown in FIG. 1 essentially consists of a housing 1, formed from an upper housing part 2 and a lower housing part 3.
  • a housing 1 formed from an upper housing part 2 and a lower housing part 3.
  • the inlet 4 opens into a chamber 5, the lower end of the inlet 4 already being part of the cross-sectional constriction down the chamber 5.
  • the end of the chamber 5 is formed by an annular gap 6, to which the liquid flows with a constant increase in speed.
  • a tip 7 in the middle of a bottom 21 of the chamber 5, which is designed as an annular trough, is involved in the uniform distribution of the flow on the circumferential, endless annular gap 6.
  • the liquid jet of gas receives openings 8, and the resulting increase in volume of the mixture now present is taken into account by a correspondingly enlarged inlet of the diffuser 14.
  • the boundary surfaces 17 and 18 of the diffuser 14 formed by two disks 15 and 16 run towards each other slightly towards the outside, but overall an expansion for that flowing through the diffuser 14. Medium is present, due to the widening in the circumferential direction with increasing distance from the annular gap 6.
  • Evenly distributed around the circumference of the diffuser 14 are spacers 19, in the immediate vicinity of which a continuous screw bolt 20 connects the two housing parts 2 and 3 to one another.
  • the screw bolt 20 and, in its flow shadow, the spacer 19 hinder the exit of the diffuser at three points, but this impairment of the flow can be tolerated without significant losses.
  • the feed line 12 to the lower air chamber 10 must of course project to a level which is above the liquid level in the treatment container (not shown), in the center of which near the bottom the device according to FIG. 1 is inserted. Otherwise, the container would run empty in the rest periods via the opening 8, the lower air chamber 10 and the feed line 12. It can happen that the radial liquid jet emerging from the annular gap 6 does not completely empty the U-shaped section of the feed line 12. For this reason, a valve 22 is provided at the deepest point of the U-shaped section, which is opened briefly when the system is started up and, when the air has already been sucked in, discharges through the supply line 12 the remaining liquid accumulated here. Thereafter the valve 22 can be closed again and need not be taken into account for the rest of the operation.
  • the bottom 21 of the chamber 5 is interchangeably inserted into the lower housing part 3, whereby in particular the width of the annular gap 6 and the shape of the chamber bottom vary slightly and can be adapted to different tasks. For example, if the tip 7 tends to be fibrous or -fo accumulate other contaminants from the liquid and there is a risk of blockage of the annular gap 6, the bottom of the chamber 5 can be slightly curved in the manner of a watch glass with the lowest point in the center. A variation of the annular gap 6 is possible by changing the thickness of the bottom 21. If the diffuser 14 is also to be changed, spacers 19 of different thicknesses can be used and the bolts 20 can be tightened to a different span length.
  • the exemplary embodiment shown in FIG. 2 is intended for a fairly large liquid throughput, that is to say for a larger system, while the exemplary embodiment according to FIG. 1 is reserved for a substantially smaller system with a much lower liquid throughput.
  • Corresponding differences are also present in the outer dimensions, the exact dimensions being based on the liquid throughput quantity and on the selected exit velocity in the annular gap. The rest of the two devices are very similar, although the larger throughput also results in deviations, which are described in particularly great detail below.
  • the upper housing part 30 and a lower housing part 31 cooperate in such a way that an annular gap 33 is formed between them, which is fed from an annular chamber 32.
  • the annular chamber 32 is approximately toroidal, with a continuously narrowing acceleration path radially outward, which is the narrowest in the annular gap 33
  • the annular chamber 32 is fed by a plurality of feed lines, which are preferably located opposite one another in pairs and which are indicated by dashed lines in FIG. Deviating from this, there can of course be a central supply of the type of chamber 5 according to FIG.
  • the air chambers 34 Above and below the diffuser 43 are again the air chambers 34, the outlet of which is in the form of openings .1 35 are located immediately above and below the exit of the annular gap 33.
  • the entire air is supplied to the upper chamber 34 via a plurality of supply lines 36, of which only a single supply line 36 is shown in FIG. 2 for the sake of clarity.
  • a connecting line 37 leads to the lower air chamber 34.
  • the connecting line 37 extends approximately to the wall of the treatment container in which the device according to FIG. 2 is accommodated. This is indicated by dashed lines within the connecting line 37.
  • the connecting line 37 is also available in several copies in order to ensure an adequate supply of the lower air chamber 34 with gas.
  • the diffuser 43 is in turn formed from two rings 38 and 39, which are angled at their outer ends upwards or downwards.
  • a plurality of spacer webs 42 evenly distributed around the circumference, are provided between their boundary surfaces 40 and 41, which are designed to be particularly low-resistance and keep the housing halves 30 and 31 and the associated housing parts at a distance from one another.
  • the spacer webs 42 can be hollow and, in addition to the connecting line 37 or in its place, can ensure the passage of air from the upper air chamber 34 into the lower air chamber 34. In addition or independently of this, with the aid of the spacer webs 42 a swirl of the flow leaving the diffuser 43 can be generated, namely by a slight curvature of all spacer webs 42 in the same direction in the same direction.
  • a cross-sectional view through one of the spacer webs 42 producing a swirl is shown in FIG.
  • the clear width of the annular gap 33 can be adjusted with the aid of disks 45 which are between the two housing parts 30 and 31 or between the lower housing part 31 and a further housing part 44, which forms the bottom of the lower air chamber 34. Also a change in
  • Diffuser 43 with respect to its profile or with respect to the distance between its boundary surfaces 40 and 41 is possible by changing the rings 38 and 39 or by changing the height of the spacer webs 42. In this way, adjustments to different uses can be made relatively quickly.
  • the exemplary embodiment shown in FIGS. 2 and 3 can also be produced almost exclusively from turned parts, which also applies to the exemplary embodiment according to FIG. 1.
  • the manufacturing costs are correspondingly low, which indirectly further .3 decrease that there is a relatively central supply of the operating means to the device, which makes the usual distribution along the circumference of a treatment basin unnecessary.
  • the actual device can be made of steel, plastic or an alloy, the choice of material primarily depending on the aggressiveness of the medium to be treated. In any case, the flow velocities are chosen from the construction in such a way that damage by cavitation or the like is virtually impossible.
  • the exit velocity of the liquid from the annular gap can be artificially increased by superimposing a swirl on the radial flow direction, which is generated within the chamber 5 or within the annular chamber 32.
  • a swirl is generated by guide bodies in the acceleration sections, which, with a corresponding design, have an approximately low-loss effect.
  • FIG. 4 shows a further exemplary embodiment of a device according to the invention.
  • the function is similar to the exemplary embodiment according to FIG. 1, only the supply of the liquid and the air supply to a lower air chamber 60 are designed differently.
  • the diffuser there are therefore no reference numerals in FIG. 4, since the description thereof would represent a repetition.
  • the upper part 52 and the lower part 53 of a housing 51 are each provided with an upper inlet 54 and a lower inlet 55, which together form a channel 50 in the vicinity of an annular gap 56.
  • the channel 50 is too monotonously decreasing in diameter on the annular gap 56, so that the inlet 54 and 55 with the same pressure 4k flowing liquid is accelerated in this area. It then enters the diffuser at high speed from the annular gap 56 past the openings 58.
  • the upper housing part 52 is provided with a feed line 61 for the gas, in particular for air. In three places
  • Liquid-free areas 62 form in the flow shadow of these spacers 57 and ensure the overflow of air from the upper air chamber 59 into the lower air chamber 60.
  • the flow is indicated schematically by dashed lines.
  • the exemplary embodiment according to FIG. 4 is used in cases in which a supply of the liquid from below to the device is possible without difficulty.
  • a supply of the liquid from below to the device is possible without difficulty.
  • the liquid emerging from the respective annular gap 6, 33 or 56 normally emerges in a uniformly flowing manner without strong turbulence. With particularly wide ring gaps, however, turbulence can increasingly occur the uptake of gas is apparently beneficial immediately thereafter. If necessary, the diffuser inlet must then be slightly widened, that is to say converted into a type of catch constellation. Excellent gassing results have also been achieved with such devices according to the invention.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Jet Pumps And Other Pumps (AREA)

Abstract

Un dispositif sert à introduire de façon continue un gaz dans un liquide, dans le cadre d'une installation de flottation, de désencrage ou autres. Le liquide sort par un passage annulaire sans fin (6) ne comportant aucun obstacle intérieur tels que parois de délimitation ou autres, et entre après avoir absorbé le gaz dans un diffuseur radial (14), par où le liquide enrichi de bulles de gaz sort dans le récipient de traitement de l'installation. Pour cette raison, un seul dispositif de gazéification agencé centralement près du fond du récipient suffit pour des cuves de traitement à section transversale circulaire. Un écoulement tourbillonnaire peut être obtenu par une déviation correspondante au niveau du diffuseur ou de la première chambre du liquide dans le passage annulaire.
EP85905619A 1984-10-27 1985-10-28 Dispositif d'introduction d'un gaz dans un liquide Expired EP0198073B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3439464 1984-10-27
DE19843439464 DE3439464A1 (de) 1984-10-27 1984-10-27 Vorrichtung zur einbringung eines gases in eine fluessigkeit

Publications (2)

Publication Number Publication Date
EP0198073A1 true EP0198073A1 (fr) 1986-10-22
EP0198073B1 EP0198073B1 (fr) 1989-09-27

Family

ID=6248959

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85905619A Expired EP0198073B1 (fr) 1984-10-27 1985-10-28 Dispositif d'introduction d'un gaz dans un liquide

Country Status (5)

Country Link
US (1) US4743408A (fr)
EP (1) EP0198073B1 (fr)
JP (1) JPS62500576A (fr)
DE (2) DE3439464A1 (fr)
WO (1) WO1986002577A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI82436C (fi) * 1988-03-10 1991-03-11 Outokumpu Oy Anordning foer bildande av smao bubblor i en vaetska.
GB9213513D0 (en) * 1992-06-25 1992-08-12 Thames Water Utilities A nozzle
US5720551A (en) 1994-10-28 1998-02-24 Shechter; Tal Forming emulsions
DE19950600C2 (de) * 1999-10-21 2003-09-18 K & S Kali Gmbh Vorrichtung zur Begasung einer Flotationstrübe in einer pneumatischen Flotationszelle
CN1323040C (zh) * 2003-12-23 2007-06-27 西安建筑科技大学 多功能扬水曝气器
AT501976B1 (de) * 2005-05-25 2007-03-15 Andritz Ag Maschf Vorrichtung zur flotation einer flüssigkeit
US9393863B2 (en) * 2014-02-14 2016-07-19 Ford Global Technologies, Llc Fuel filler spud diffuser

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE166309C (fr) *
CH490108A (de) * 1969-01-28 1970-05-15 Kerag Kesselschmiede App Und M Vorrichtung zum Vermischen von strömungsfähigen Medien
US3946948A (en) * 1974-10-18 1976-03-30 Grangesbergs Industrivaru Ab Ejector
NO136638C (no) * 1974-11-20 1977-10-12 Patents & Dev As Anordning ved vertikal ledning (drop-line)
FR2397870A1 (fr) * 1977-07-18 1979-02-16 Coorens Antoine Appareils a jet pour l'aspiration, la compression et le melange de fluides
DE3008476A1 (de) * 1980-03-05 1981-09-17 Bayer Ag, 5090 Leverkusen Verfahren zur flotation und verwendung von trichterduesen zur flotation
DE3015788C2 (de) * 1980-04-24 1982-07-29 E. & M. Lamort S.A., 51300 Vitry-le-François, Marne Flotationsvorrichtung zum Deinken von Faserstoffsuspensionen
US4282172A (en) * 1980-09-11 1981-08-04 Howe-Baker Engineers, Inc. Gas to liquid diffuser

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8602577A1 *

Also Published As

Publication number Publication date
EP0198073B1 (fr) 1989-09-27
DE3573217D1 (en) 1989-11-02
DE3439464A1 (de) 1986-05-07
US4743408A (en) 1988-05-10
WO1986002577A1 (fr) 1986-05-09
JPS62500576A (ja) 1987-03-12

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