EP3626336B1 - Mischsystem zum einbringen von chemischen substanzen in eine zu behandelndes flüssigkeit - Google Patents

Mischsystem zum einbringen von chemischen substanzen in eine zu behandelndes flüssigkeit Download PDF

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Publication number
EP3626336B1
EP3626336B1 EP19198702.3A EP19198702A EP3626336B1 EP 3626336 B1 EP3626336 B1 EP 3626336B1 EP 19198702 A EP19198702 A EP 19198702A EP 3626336 B1 EP3626336 B1 EP 3626336B1
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EP
European Patent Office
Prior art keywords
chamber
mixing system
fluid
internal wall
mixing
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EP19198702.3A
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English (en)
French (fr)
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EP3626336A1 (de
Inventor
Mario SAVIO
Filippo SAVIO
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SPCM SA
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Savio Srl
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Publication of EP3626336A1 publication Critical patent/EP3626336A1/de
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    • 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
    • B01F23/43—Mixing liquids with liquids; Emulsifying using driven stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
    • B01F27/191—Stirrers with two or more mixing elements mounted in sequence on the same axis with similar elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/86—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis co-operating with deflectors or baffles fixed to the receptacle
    • B01F27/861—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis co-operating with deflectors or baffles fixed to the receptacle the baffles being of cylindrical shape, e.g. a mixing chamber surrounding the stirrer, the baffle being displaced axially to form an interior mixing chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/91—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with propellers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/305—Treatment of water, waste water or sewage

Definitions

  • the invention concerns a mixing system designed to introduce chemical substances in a fluid to be treated.
  • a process for the treatment of the waste water of a paper mill include the use of a polyelectrolyte, for example a cationic flocculant powder, or even, for example, a cationic polyacrylamide, suited to be applied in the clariflocculation of water containing organic substances, in sludge thickening treatments, in sludge dehydration processes and also in other processes carried out in paper mills, such as froth flotation.
  • a polyelectrolyte for example a cationic flocculant powder
  • a cationic polyacrylamide suited to be applied in the clariflocculation of water containing organic substances, in sludge thickening treatments, in sludge dehydration processes and also in other processes carried out in paper mills, such as froth flotation.
  • these polymers need premixing with water at a preestablished concentration.
  • premixing step is carried out in static mixing tanks, in which the polymer is introduced after being taken from a small storage container; said polymers are normally diluted in solutions between 0.2% and 1%, therefore they are very demanding in terms of water usage.
  • a booster pump introduces the water with the polymer into a pipe leading to a tank or a channel for the treatment of waste sludge.
  • the patent document US5314076 describes a system for mixing two fluid phases, more specifically for mixing a treatment fluid with a fluid to be treated; said system comprises two concentric chambers that communicate with each other at least with their ends, the central chamber being provided with two turbines whose rotation axis is equal to the axis of symmetry of the installation.
  • the fluid to be treated flows in from the top, flows out from the bottom and the turbines are interposed between the inlet and the outlet.
  • the diffuser and the mixer define three internal chambers that are superimposed in vertical direction, an upper chamber, a central chamber and a lower chamber, as well as an external annular region. Each of the three internal chambers is in fluid communication with the annular region.
  • the fluid to be treated flows in from the top, flows out from the bottom and the turbines are interposed between the inlet and the outlet.
  • GB-A-2 136 304 discloses a mixing system in accordance with the preamble of claim 1.
  • a mixing system according to the invention is indicated by the numeral 10.
  • Said mixing system 10 comprises:
  • the second chamber 17 is to be understood as ring-shaped.
  • the labyrinthine mixing path 30 is indicated by arrows that schematically show the possible paths of the fluid being treated between the inlet duct 19 and the outlet duct 20.
  • the drive means comprise, for example and not exclusively, a motor 35 configured to set the rotation shaft 21 rotating.
  • Said rotation shaft 21 carries the stirring blades 18.
  • the rotation axis of the rotation shaft 21 is parallel to the direction of extension of the internal wall 13.
  • the external wall 12 has a cylindrical shape.
  • the internal wall 13 has a cylindrical shape.
  • the second chamber 17 surrounds the first chamber 16. More specifically, the second chamber 17 is concentric and coaxial with the first chamber 16.
  • the inlet duct 19 is positioned below the outlet duct 20 with respect to a configuration of use of the mixing system 10.
  • the stirring blades 18 comprise a first group of blades 18a positioned at the lower end of the rotation shaft 21.
  • said first group of blades 18a is positioned below the inlet duct 19 with respect to a configuration of use of the mixing system 10.
  • Said first group of blades 18a is to be understood as capable of being arranged also in another position along the rotation shaft 21.
  • stirring blades 18 can be constituted by a single group of blades 18a.
  • the stirring blades 18 comprise also a second group of blades 18b positioned in a central area of the rotation shaft 21.
  • said second group of blades 18b is positioned above the inlet duct 19 with respect to a configuration of use of the mixing system 10.
  • the first chamber 16 and the second chamber 17 are in communication with each other through at least one passage opening 37 defined at the level of one end of the internal wall 13.
  • a first passage opening 37 is defined by a lower recirculation space between a lower end 13a of the internal wall 13 and the bottom 14.
  • a second passage opening 38 is defined by an upper recirculation space between an upper end 13b of the internal wall 13 and the cover 15.
  • first chamber 16 and the second chamber 17 are in communication only through a lower passage opening 37; in said variant the upper end 13b of the internal wall 13 is in contact with the cover 15 and there is no upper passage opening 38.
  • first chamber 16 and the second chamber 17 are in communication only through an upper passage opening 38; in said variant the lower end 13a of the internal wall 13 is in contact with the bottom 14 and there is no lower passage opening 37.
  • the inlet duct 19 and the outlet duct 20 are both advantageously positioned in proximity to the bottom 14 with respect to a configuration of use of the mixing system 10.
  • the mixing system 10 comprises a flow deviation element 40 configured to deviate the fluid flowing out of the first chamber 16 towards the second chamber 17.
  • Said flow deviation element 40 is placed on the bottom 14.
  • Said flow deviation element 40 is constituted by a body in the shape of a cone or truncated cone, configured to deviate the flow towards the outside in radial direction, where the term 'radial' is intended with respect to an axial direction of the axis of symmetry of the internal wall 13, wherein the flow is flowing downwards from the first chamber 16.
  • the at least one injection passage 22 comprises a first injection pipe 22a directly connected to the inlet duct 19.
  • Said at least one injection passage 22 comprises, in addition, a second injection pipe 22b directly connected to the first chamber 16.
  • Said at least one injection passage 22 comprises, in addition to both of the first injection pipe 22a and second injection pipe 22b, a third injection pipe 22c directly connected to the second chamber 17.
  • a second embodiment of a mixing system is schematically represented in Figure 2 and therein indicated by the numeral 110.
  • the specific characteristic of the mixing system 110 lies in that the container 111, comprising an external wall 112, an internal wall 113, a bottom 114 and a cover 115, comprises also an intermediate wall 150.
  • Said intermediate wall 150 defines, together with the external wall 112 and the internal wall 113, three concentric mixing chambers, a first central chamber 116 defined within the internal wall 113, a second intermediate chamber 117 that surrounds the first chamber 116 and a third external chamber 153 that surrounds the second chamber 117.
  • a first passage opening 137 between the first chamber 116 and the second chamber 117 is defined by an upper recirculation space between an upper end 113a of the internal wall 113 and the cover 115.
  • a second passage opening 138 between the first chamber 116 and the second chamber 117 is defined by a lower recirculation space between a lower end 113b of the internal wall 113 and the bottom 114.
  • a first passage opening 154 between the second chamber 117 and the third chamber 153 is defined by a lower recirculation space between a lower end 150a of the intermediate wall 150 and the bottom 114.
  • a second passage opening 155 between the second chamber 117 and the third chamber 153 is defined by an upper recirculation space between an upper end 150b of the intermediate wall 150 and the cover 115.
  • first chamber 116 and the second chamber 117 are in communication only through an upper passage opening 137, and the second chamber 117 and the third chamber 153 are in communication only through a lower passage opening 154.
  • first chamber 116 and the second chamber 117 are in communication only through a lower passage opening 138, and the second chamber 117 and the third chamber 153 are in communication only through an upper passage opening 155.
  • the inlet duct 119 and the outlet duct 120 are both advantageously positioned in proximity to the bottom 114 with respect to a configuration of use of the mixing system 110.
  • the mixing system 110 comprises a flow deviation element 140 configured to deviate the fluid flowing out of the first chamber 116 or the second chamber 117 towards the third chamber 153.
  • Said flow deviation element 140 is placed on the bottom 114.
  • Said flow deviation element 140 is constituted by a body in the shape of a cone or truncated cone, configured to deviate the flow towards the outside in radial direction.
  • the mixing system 110 comprises an injection passage 122 for the introduction of a chemical additive in one or more points of the labyrinthine mixing path 130.
  • the mixing system 10 operates in such a way that the fluid to be treated, for example sludge, flows into the first chamber 16 through the inlet duct 19 and, thanks to gravity and to the action of the stirring blades 18, flows downwards, towards the passage opening 37, in which it is deviated upwards into the second chamber 17; while flowing upwards along the second chamber 17 the treated fluid meets the outlet duct 20 and is conveyed into it.
  • the fluid to be treated for example sludge
  • a chemical additive for example cationic polyacrylamide, is injected in the fluid to be treated during its passage through said labyrinthine mixing path 30.
  • the mixing system 110 operates in such a way that the fluid to be treated flows into the first chamber 116 through the inlet duct 119 and is conveyed upwards thanks to the action of the stirring blades 118.
  • the fluid follows a labyrinthine mixing path 130 in which it passes through all of the three chambers, the first 116, the second 117 and the third 153, and from the latter passes into the outlet duct 120.
  • the invention provides a mixing system thanks to which the fluid to be treated and the chemical additive are mixed with no need for the chemical additive to be prepared, meaning diluted, in advance in costly and bulky water tanks, thus drastically reducing water consumption.
  • the chemical additive for example a cationic flocculant polymer
  • a cationic flocculant polymer is activated when it comes in direct contact with a fluid to be treated, and this happens directly inside the first, the second and, if necessary, the third chamber.
  • the invention provides a mixing system which, thanks to the stirring effect produced by the stirring blades, improves the effectiveness and the efficiency of the chemical additive; for example, in the case of organic sludge, in which the sludge has an apolar surface membrane, the strong stirring action favours the breakage of said membrane and makes anionic sites available; the introduction of and the mixing with a cationic polyelectrolyte make the anionic sites react with the cationic polyelectrolyte releasing water molecules, which favours a greater separation of the solid fraction of the fluid being treated from the liquid fraction.
  • the invention provides a mixing system that makes it possible to drastically reduce the use of water when preparing a polyelectrolyte intended to be introduced in a flow of waste fluid to be treated.
  • the invention provides a mixing system that favours the reduction of energy consumption in waste water treatment processes, since it is no more necessary to manage a mixing and storage tank and the efficiency in terms of separation of the dry fraction from the liquid fraction is improved compared to the known treatment systems.
  • the invention provides a mixing system that improves water retention from sludge, thus increasing the quantity of dry product obtainable.
  • the invention provides a mixing system that is capable of reducing waiting times before the beginning of the action of the polymer in solution on the fluid to be treated, consequently improving the effectiveness of the polymer itself; this has been obtained by introducing the chemical additive directly in the fluid to be treated and subjecting both of them to a mixing action produced by the stirring blades.
  • the invention provides a compact mixing system that can be easily set up also in existing waste water purification or treatment systems or sludge drying systems.
  • the invention provides a mixing system that limits the proliferation of bacteria on the same polyelectrolytes, thanks to the direct introduction of the same polyelectrolytes directly in the fluid to be treated, without providing for a storage period before use.
  • any components and any materials can be used, provided that they are compatible with the intended use, and any shape and size can be selected, according to the needs and the state of the art.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Claims (7)

  1. Mischsystem (10) zur Einbringung chemischer Substanzen in ein aufzubereitendes Fluid, Folgendes umfassend:
    - einen Behälter (11), eine Außenwand (12), eine Innenwand (13), einen Boden (14) und einen Deckel (15) umfassend,
    - wenigstens zwei konzentrische Mischkammern, eine erste mittlere Kammer (16), die innerhalb der besagten Innenwand (13) definiert ist, und eine zweite Kammer (17), die außerhalb der besagten Innenwand (13) definiert ist, wobei die besagte erste Kammer (16) und die besagte zweite Kammer (17) miteinander kommunizieren,
    - eine Einlassleitung (19) für ein aufzubereitendes Fluid, dazu konfiguriert, das besagte Fluid von außen in die besagte erste Kammer (16) zu leiten,
    - eine Auslassleitung (20) für das besagte, aufbereitete Fluid, für den Auslass des besagten Fluids aus der besagten zweiten Kammer (17) aus dem besagten Behälter (11) heraus konfiguriert,
    wobei die besagte Einlassleitung (19), die besagte erste Kammer (16), die besagte zweite Kammer (17) und die besagte Auslassleitung (20) dazu konfiguriert sind, einen labyrinthartigen Mischpfad (30) zu definieren,
    - innerhalb der besagten ersten Kammer (16) positionierte Rührschaufeln (18), die über eine Drehwelle (21) durch Antriebsmittel betrieben werden,
    - wenigstens ein Einspritzkanal (22) zur Einleitung eines chemischen Hilfsstoffes an einer oder mehreren Stellen des besagten labyrinthartigen Mischpfads (30),
    wobei die besagte Einlassleitung (19) bezüglich einer Gebrauchskonfiguration des besagten Mischsystems (10) unterhalb der besagten Auslassleitung (20) angeordnet ist,
    - wobei die besagten Rührschaufeln (18) wenigstens eine erste Schaufelgruppe (18a) umfassen,
    - wobei die besagte erste Schaufelgruppe (18a) bezüglich einer Gebrauchskonfiguration des Mischsystems (10) unterhalb der besagten Einlassleitung (19) angeordnet ist,
    dadurch gekennzeichnet, dass der besagte wenigstens eine Einspritzkanal (22) Folgendes umfasst:
    - ein erstes Einspritzrohr (22a), das direkt mit der besagten Einlassleitung (19) verbunden ist;
    - ein zweites Einspritzrohr (22b), das direkt mit der besagten ersten Kammer (16) verbunden ist;
    - ein drittes Einspritzrohr (22c), das direkt mit der besagten zweiten Kammer (17) verbunden ist.
  2. Mischsystem nach Patentanspruch 1, dadurch gekennzeichnet, dass die besagten Antriebsmittel einen Motor (35) umfassen, der dazu konfiguriert ist, die besagte Drehwelle (21) in Drehung zu versetzen, wobei die besagte Drehwelle (21) die besagten Rührschaufeln (18) trägt.
  3. Mischsystem nach einem oder mehreren der vorstehenden Patentansprüche, dadurch gekennzeichnet, dass die besagte erste Kammer (16) und die besagte zweite Kammer (17) durch wenigstens eine auf der Ebene eines Endes der besagten Innenwand (13) definierte Durchflussöffnung (37) miteinander kommunizieren.
  4. Mischsystem nach Patentanspruch 3, dadurch gekennzeichnet, dass durch einen unteren Rezirkulationsraum zwischen einem unteren Ende (13a) der besagten Innenwand (13) und dem besagten Boden (14) eine erste Durchflussöffnung (37) definiert ist.
  5. Mischsystem nach einem oder mehreren der Patentansprüche 3 und 4, dadurch gekennzeichnet, dass durch einen oberen Rezirkulationsraum zwischen einem oberen Ende (13b) der besagten Innenwand (13) und dem besagten Deckel (15) eine zweite Durchflussöffnung (38) definiert ist.
  6. Mischsystem nach einem oder mehreren der vorstehenden Patentansprüche, dadurch gekennzeichnet, dass es ein Flussablenkelement (40) umfasst, das dazu konfiguriert ist, das besagte, aus der besagten ersten Kammer (16) ausfließende Fluid zu der besagten zweiten Kammer (17) abzulenken.
  7. Mischsystem nach einem oder mehreren der vorstehenden Patentansprüche, dadurch gekennzeichnet, dass der besagte Behälter (111), der eine Außenwand (112), eine Innenwand (113), einen Boden (114) und einen Deckel (115) umfasst, des Weiteren eine Zwischenwand (150) umfasst, wobei die besagte Zwischenwand (150) mit der besagten Außenwand (112) und mit der besagten Innenwand (113) zusammen drei konzentrische Mischkammern definiert, eine erste, mittlere Kammer (116), die innerhalb der besagten Innenwand (113) definiert ist, eine zweite Zwischenkammer (117), welche die besagte erste Kammer (116) umgibt, und eine dritte Außenkammer (153), welche die besagte zweite Kammer (117) umgibt.
EP19198702.3A 2018-09-21 2019-09-20 Mischsystem zum einbringen von chemischen substanzen in eine zu behandelndes flüssigkeit Active EP3626336B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL19198702T PL3626336T3 (pl) 2018-09-21 2019-09-20 Instalacja mieszająca do wprowadzania substancji chemicznych do płynu poddawanego obróbce

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT201800008821 2018-09-21

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EP3626336A1 EP3626336A1 (de) 2020-03-25
EP3626336B1 true EP3626336B1 (de) 2021-09-01

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EP (1) EP3626336B1 (de)
ES (1) ES2898393T3 (de)
PL (1) PL3626336T3 (de)
PT (1) PT3626336T (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4122587A1 (de) 2021-06-30 2023-01-25 Spcm Sa Verbessertes mischsystem zum einbringen von chemischen substanzen in eine zu behandelnde flüssigkeit

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577856A (en) 1944-07-15 1951-12-11 Standard Oil Dev Co Polymerization reaction vessel
NL6516783A (de) 1965-12-23 1967-06-26
US3737288A (en) 1971-06-18 1973-06-05 Exxon Co Antifouling deflector in olefin polymerization reactors
FI67031C (fi) * 1983-02-24 1985-01-10 Outokumpu Oy Saett att oxidera slam innehaollande rikligt med fast materialoch en motstroemsbubbelreaktor foer utfoerande av saettet
US4719252A (en) * 1986-07-22 1988-01-12 Drew Chemical Co. Process and apparatus for forming polymeric solutions
FR2672230B1 (fr) 1991-02-04 1993-04-16 Anjou Rech Installation de melange de deux phases fluides par agitation mecanique, notamment pour le traitement des eaux par transfert de gaz oxydant, et utilisation d'une telle installation.
US8715498B2 (en) 2011-02-09 2014-05-06 Tervita Corporation System and apparatus for treating well flow-back and produced water or other wastewater

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PL3626336T3 (pl) 2022-01-31
ES2898393T3 (es) 2022-03-07
PT3626336T (pt) 2021-11-15
EP3626336A1 (de) 2020-03-25

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