NO158998B - INJECTOR FOR FLOTING DEVICES. - Google Patents

INJECTOR FOR FLOTING DEVICES. Download PDF

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Publication number
NO158998B
NO158998B NO831167A NO831167A NO158998B NO 158998 B NO158998 B NO 158998B NO 831167 A NO831167 A NO 831167A NO 831167 A NO831167 A NO 831167A NO 158998 B NO158998 B NO 158998B
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NO
Norway
Prior art keywords
injector
narrowing point
mixing section
section
injector according
Prior art date
Application number
NO831167A
Other languages
Norwegian (no)
Other versions
NO158998C (en
NO831167L (en
Inventor
Peter Schweiss
Hans-Dieter Doerflinger
Original Assignee
Voith Gmbh J M
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 Voith Gmbh J M filed Critical Voith Gmbh J M
Publication of NO831167L publication Critical patent/NO831167L/en
Publication of NO158998B publication Critical patent/NO158998B/en
Publication of NO158998C publication Critical patent/NO158998C/en

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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
    • 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
    • B01F25/31241—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 circumferential area of the venturi, creating an aspiration in the central 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
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/433—Mixing tubes wherein the shape of the tube influences the mixing, e.g. mixing tubes with varying cross-section or provided with inwardly extending profiles
    • 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
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/433—Mixing tubes wherein the shape of the tube influences the mixing, e.g. mixing tubes with varying cross-section or provided with inwardly extending profiles
    • B01F25/4335—Mixers with a converging-diverging cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1418—Flotation machines using centrifugal forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/24—Pneumatic
    • B03D1/247—Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/70—Pulp catching, de-watering, or recovering; Re-use of pulp-water by flotation
    • 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

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Biotechnology (AREA)
  • Organic Chemistry (AREA)
  • Water Supply & Treatment (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Nozzles (AREA)
  • Fish Paste Products (AREA)
  • Paper (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Cyclones (AREA)

Abstract

1. Flotation apparatus having an injector serving to introduce a mixture of gas and fluid into the flotation apparatus, the injector having a constriction and a mixing section (5) behind this and also a gas intake guided centrally into the constriction, characterised by the following features of the injector : a) the constriction (3, 4) widens abruptly towards the mixing section (5), b) the centrally guided gas intake (6) ends a short distance behind the constriction (3, 4) in the mixing section (5), c) the mixing section (5) has a second constriction (7) widening like a diffusor.

Description

Oppfinnelsen vedrører en injektor som angitt i patentkrav l's innledning. The invention relates to an injector as stated in the introduction of patent claim 1.

En slik injektor er kjent i fra DE-OS 2701702. I denne injektor blir det i en foran en fIotasjonsbeholder plassert behold-er tilveiebrakt en blanding av en væske, eksempelvis en suspensjon, og gass, eksempelvis luft, før denne blandingen til-føres den egentlige rotasjonscelle. I injektoren er det anordnet to strupesteder etter hverandre, men det andre strupe-sted er anordnet uavhengig av injektoren og er sammenkoblet med denne via en reguleringsinnretning som gjør hele apparatet noe komplisert og dessuten også mer utsatt for driftforstyrr-elser, noe som medfører at injektoren ikke egner seg så godt for fIotasjon i store anlegg. Dessuten synes denne innretning bare å virke når injektoren med etterkoblet blandingsstrekning dykker i hovedsaken vertikalt ned i beholderen. Også dette er et forhold som tilsier at apparatet er mindre godt egnet til bruk i meget store flotasjonsbeholdere, eksempelvis avsver-tingsanlegg i papirindustrien. Such an injector is known from DE-OS 2701702. In this injector, a mixture of a liquid, for example a suspension, and gas, for example air, is provided in a container placed in front of a flotation container, before this mixture is supplied to it actual rotation cell. In the injector, two throttle points are arranged one after the other, but the second throttle point is arranged independently of the injector and is connected to it via a regulation device which makes the whole device somewhat complicated and also more prone to operational disturbances, which means that the injector not so well suited for flotation in large facilities. Moreover, this device only seems to work when the injector with the subsequent mixing section dips mainly vertically into the container. This is also a factor that indicates that the device is less suitable for use in very large flotation containers, for example de-inking plants in the paper industry.

Hensikten med oppfinnelsen er å tilveiebringe en injektor med en enkel konstruksjon, hvdlken injektor særlig skal egne seg for bruk i store apparater. Injektoren skal samtidig ha en god virkningsgrad, dvs. særlig også muliggjøre en optimal blanding av fine gassbobler med den suspensjon som skal flotteres. The purpose of the invention is to provide an injector with a simple construction, which injector should be particularly suitable for use in large appliances. The injector must also have a good degree of efficiency, i.e. in particular also enable an optimal mixture of fine gas bubbles with the suspension to be floated.

Dette oppnås ifølge oppfinnelsen med en injektor av den inn-ledningsvis nevnte type, utført med de trekk som fremgår av karakteristikken i patentkrav 1. According to the invention, this is achieved with an injector of the type mentioned at the outset, made with the features that appear from the characteristic in patent claim 1.

Fordelaktig utførelsesformer går frem av underkravene, særlig Advantageous embodiments emerge from the subclaims, in particular

av kravene 2, 4 og 5. of requirements 2, 4 and 5.

Oppfinnelsen skal forklares nærmere under henvisning til tegningene, som viser foretrukne utførelser. The invention will be explained in more detail with reference to the drawings, which show preferred embodiments.

På tegningene, viser On the drawings, shows

fig. la og b injektoren ifølge oppfinnelsen sett i lengde- fig. la and b the injector according to the invention viewed longitudinally

snitt i vertikal retning og horisontal retning, section in vertical direction and horizontal direction,

fig. 2 viser injektoranordningen med en vertikalt anordnet, fig. 2 shows the injector arrangement with a vertically arranged,

rund, dvs. sylindrisk fIotasjonsbeholder, og round, i.e. cylindrical flotation container, and

fig. 3 viser en annen utførelsesform av injektoren. fig. 3 shows another embodiment of the injector.

Den suspensjon;som skal flotteres tilføres fIotasjonsbeholderen The suspension to be floated is added to the flotation container

1 gjennom injektoren, iblandet fine gassbobler. Injektoren har først et sirkelsylindrisk tilføringsrør 2 for suspensjonen. Dette rør ender i en blende 3 eller i en ikke utvidet dyse 4. Viktig for injektorens funksjon er at disse innsnevringssteder, som be-finner seg ved begynnelsen av blandingsstrekningen 5, brått utvider seg til en blandingsstrekning 5. Tilførselsrøret 6 for gassen, dvs. for luften, er ført sentralt inn i den siste delen av tilføringsrøret 2 for suspensjonen og går sentralt igjennom det innsnevrede sted, dvs. blenden eller dysen. Tilførselsrøret 6 for gassen rager et kort stykke inn i blandingsstrekningen 5. 1 through the injector, mixed with fine gas bubbles. The injector first has a circular cylindrical supply pipe 2 for the suspension. This pipe ends in an aperture 3 or in an unexpanded nozzle 4. Important for the injector's function is that these narrowing points, which are at the beginning of the mixing section 5, suddenly widen into a mixing section 5. The supply pipe 6 for the gas, i.e. for the air, is led centrally into the last part of the supply pipe 2 for the suspension and passes centrally through the constricted place, i.e. the orifice or the nozzle. The supply pipe 6 for the gas projects a short distance into the mixing section 5.

Blandingsstrekningen 5 består i hovedsaken av en rettvinklet kasse med en sirkelsylinderformet inngangsdel 9. Kassen har et andre innsnevringssted 7. Dette innsnevringssted er anordnet usymmetrisk i forhold til blandingsstrekningens 5 tenkte midt-linje 8. Vesentlig for dette innsnevringssted er den diffusor-lignende utvidelse bak innsnevringsstedets 7 trangeste tverrsnitt. I dette andre innsnevringssted oppnås det en utjevning av strømningsprofilen, slik at diffusordelen av blandingsstrekningen 5 ' kan virke på optimal måte, dvs. at man oppnår den størst mulig trykkstigning i strømningen. The mixing section 5 mainly consists of a right-angled box with a circular cylindrical entrance part 9. The box has a second narrowing point 7. This narrowing point is arranged asymmetrically in relation to the imaginary center line 8 of the mixing section 5. Essential for this narrowing point is the diffuser-like expansion behind the narrowing point 7 narrowest cross section. In this second narrowing point, an equalization of the flow profile is achieved, so that the diffuser part of the mixing section 5' can work in an optimal way, i.e. that the greatest possible pressure rise in the flow is achieved.

Av fig. 2 går det frem at det etter blandingsstrekningen 5 følger en kasseformet innstrømningsdel 10. Denne delen 10 From fig. 2, it appears that a box-shaped inflow part 10 follows after the mixing section 5. This part 10

står omtrent tangensielt i fIotasjonsbeholderen 1. Delen slutter ved. en .indre, konsentrisk i beholderen 1 anordnet førings- stands approximately tangentially in the flotation container 1. The part ends at. an inner, concentrically arranged guide in the container 1

sylinder 11. Videre er det i fig. 2 vist en sideåpning i den radielt sett innerste veggen i kassen 10, i den nedre delen av kassen. Den bevirker en gjennomblanding av frisk innstrøm-r mende suspensjon med strømningen i fIotasjonsbeholderen 1. cylinder 11. Furthermore, in fig. 2 shows a side opening in the radially innermost wall of the box 10, in the lower part of the box. It causes a thorough mixing of fresh inflowing suspension with the flow in the flotation container 1.

Det har vist seg at en slik anordning er særlig gunstig for fIotasjonsvirkningen. Det er ikke vist, men suspensjonen går i en strømlinjeformet bane i fIotasjonsbeholderen i det ytre ringrom 12, dvs. først oppover, hvor fIotasjonsskummet trek-kes av, og så nedover mot den i bunnen av fIotasjonsbeholderen 1 anordnede uttrekksåpning 13 for den rensede suspensjon. It has been shown that such a device is particularly beneficial for the flotation effect. It is not shown, but the suspension travels in a streamlined path in the flotation container in the outer annulus 12, i.e. first upwards, where the flotation foam is drawn off, and then downwards towards the extraction opening 13 arranged at the bottom of the flotation container 1 for the purified suspension.

Den viste utførelsesform med rettvinklede tverrsnitt har vist seg særlig gunstig. Man kan imidlertid også benytte et rundt, eksempelvis et elliptisk tverrsnitt. Likeledes kan det usymmetrisk plasserte andre innsnevringssted også være anordnet usymmetrisk i forhold til horisontalretningen i blandningsstrek-ningen 5. The embodiment shown with right-angled cross-sections has proven particularly advantageous. However, you can also use a round, for example an elliptical cross-section. Likewise, the asymmetrically placed second narrowing point can also be arranged asymmetrically in relation to the horizontal direction in the mixing section 5.

Hensikten med innsnevringsstedet er å oppnå en utjevning av strømningsprofilen bak det første innsnevringssted. Derved at det andre innsnevringssted er anordnet usymmetrisk oppnås at det ikke behøver å ha et altfor lite lystverrsnitt, slik at således den etterkoblede diffusor kan utføres relativt kort. The purpose of the narrowing point is to achieve an equalization of the flow profile behind the first narrowing point. By the fact that the second narrowing point is arranged asymmetrically, it is achieved that it does not need to have an overly small light cross-section, so that the subsequent diffuser can thus be made relatively short.

Dersom man gjorde innsnevningsstedet meget trangt, med samtidig symmetrisk anordning, for å oppnå den samme jevne hastighets-profilen for strømningen, så måtte man gjøre diffusordelen til-svarende lang. If the constriction was made very narrow, with a symmetrical arrangement at the same time, in order to achieve the same uniform velocity profile for the flow, then the diffuser part had to be made correspondingly long.

Det har vist seg gunstig å la gasstilførselsrøret 6 slutte 50-70 mm etter det trangeste stedet i blandingsstrekningen 5. Tilførselsrøret kan herved ha en diameter på 200 mm, og over-gangsstykket 9 kan ha en maksimal diameter 250 mm. Diameterne kan imidlertid også være like store. Den absolutte størrelsen av samtlige tverrsnitt bestemmes med utgangspunkt i den til-strebede luftgjennomgangsmengde og utgangstrykket. It has proven advantageous to allow the gas supply pipe 6 to end 50-70 mm after the narrowest place in the mixing section 5. The supply pipe can thereby have a diameter of 200 mm, and the transition piece 9 can have a maximum diameter of 250 mm. However, the diameters can also be the same size. The absolute size of all cross-sections is determined on the basis of the intended air flow rate and the output pressure.

Claims (7)

1. Injektor for innføring av en gass-væskeblanding i et fIotasjonsapparat, med et innsnevringssted og en blandingsstrekning etter dette innsnevringssted, karakterisert ved følgende trekk: a) innsnevringstedet (3,4) utvider seg brått mot blandingsstrekningen (5) , b) et gasstilførselsrør (6) er ført sentralt gjennom innsnevringsstedet (3,4) og inn i blandingsstrekningen (5) og ender kort etter innsnevringsstedet (3,4) i blandingsstrekningen (5), c) blandingsstrekningen (5) har et andre innsnevringssted (7) som utvider seg diffusoraktig.1. Injector for introducing a gas-liquid mixture into a flotation device, with a narrowing point and a mixing section after this narrowing point, characterized by the following features: a) the narrowing point (3,4) expands abruptly towards the mixing section (5), b) a gas supply pipe (6) is led centrally through the narrowing point (3,4) and into the mixing section (5) and ends shortly after the narrowing point (3,4) in the mixing section (5), c) the mixing section (5) has a second narrowing point (7) which expands like a diffuser. 2. Injektor ifølge krav 1, karakterisert ved at det andre innsnevringssted (7) ligger usymmetrisk i forhold til senteraksen (8) til den uten innsnevringsstedet (7) tenkte blandingsstrekning (5).2. Injector according to claim 1, characterized in that the second narrowing point (7) is located asymmetrically in relation to the central axis (8) of the mixing section (5) imagined without the narrowing point (7). 3. Injektor ifølge krav 1 eller 2, karakterisert ved at blandingsstrekningen (5) har en sirkelsylindrisk begynnelsesdel (9) og en tilsluttet overgangsdel som danner en forbindelse til en tilslutningssdel (10) med rettvinklet tverrsnitt, idet det andre innsnevringsstedet (7) er anordnet i overgangsdelen.3. Injector according to claim 1 or 2, characterized in that the mixing section (5) has a circular cylindrical beginning part (9) and a connected transition part which forms a connection to a connecting part (10) with a right-angled cross-section, the second narrowing point (7) being arranged in the transition section. 4. Injektor ifølge krav 1-3, karakterisert ved at det første innsnevringssted er en blende (3) eller en ikke utvidet, normdyse eller kvartsirkeldyse (4).4. Injector according to claims 1-3, characterized in that the first narrowing point is an aperture (3) or an unexpanded, standard nozzle or quarter-circle nozzle (4). 5. Injektor ifølge et av kravene 1-4, karakterisert ved at det andre innsnevringssted (7) ligger usymmetrisk i forhold til vertikalen i blandingsstekningen (5).5. Injector according to one of claims 1-4, characterized in that the second narrowing point (7) is located asymmetrically in relation to the vertical in the mixture roast (5). 6. Injektor ifølge et av kravene 1-5, karakterisert ved at injektoren har en tilslutningskasse (10) med i hovedsaken rettvinklet tverrsnitt til den vertikale, sirkelsylindriske fIotasjonsbeholder (1) med i hovedsaken sirkelformet horisontalt tverrsnitt, idet tilslutningskassens (10) radielt sett innerste vegg er brutt av en åpning og ender ved en koaksialt i fIotasjonsbeholderen (1) liggende ledesyl-inder (11).6. Injector according to one of claims 1-5, characterized in that the injector has a connection box (10) with an essentially right-angled cross-section to the vertical, circular-cylindrical flotation container (1) with an essentially circular horizontal cross-section, the connection box (10) radially innermost wall is broken by an opening and ends at a guide cylinder (11) lying coaxially in the flotation container (1). 7. Injektor ifølge et av kravene 1-6, karakterisert ved at injektorens tilslutning til flotasjons-beholderen (1) ligger i nærheten av fIotasjonsbeholderens bunn og i hovedsaken tangensielt i forhold til fIotasjonsbeholderen.7. Injector according to one of claims 1-6, characterized in that the injector's connection to the flotation container (1) is located near the bottom of the flotation container and mainly tangential to the flotation container.
NO831167A 1982-03-31 1983-03-29 INJECTOR FOR FLOTING DEVICES. NO158998C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3211906A DE3211906C1 (en) 1982-03-31 1982-03-31 Flotation apparatus injector

Publications (3)

Publication Number Publication Date
NO831167L NO831167L (en) 1983-10-03
NO158998B true NO158998B (en) 1988-08-15
NO158998C NO158998C (en) 1988-11-23

Family

ID=6159837

Family Applications (1)

Application Number Title Priority Date Filing Date
NO831167A NO158998C (en) 1982-03-31 1983-03-29 INJECTOR FOR FLOTING DEVICES.

Country Status (8)

Country Link
EP (1) EP0090234B1 (en)
JP (1) JPS58170557A (en)
AT (1) ATE29973T1 (en)
BR (1) BR8301765A (en)
DE (2) DE3211906C1 (en)
ES (1) ES279886Y (en)
FI (1) FI69968C (en)
NO (1) NO158998C (en)

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Publication number Publication date
NO158998C (en) 1988-11-23
EP0090234A3 (en) 1985-06-26
FI69968C (en) 1986-09-12
ES279886Y (en) 1985-06-01
BR8301765A (en) 1983-12-13
DE3211906C1 (en) 1988-12-01
DE3373876D1 (en) 1987-11-05
ES279886U (en) 1984-11-16
JPS58170557A (en) 1983-10-07
FI831093A0 (en) 1983-03-30
ATE29973T1 (en) 1987-10-15
FI831093L (en) 1983-10-01
EP0090234B1 (en) 1987-09-30
NO831167L (en) 1983-10-03
EP0090234A2 (en) 1983-10-05
FI69968B (en) 1986-01-31

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