EP4122587A1 - Système de mélange amélioré pour l'introduction de substances chimiques dans un fluide à traiter - Google Patents

Système de mélange amélioré pour l'introduction de substances chimiques dans un fluide à traiter Download PDF

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Publication number
EP4122587A1
EP4122587A1 EP21182715.9A EP21182715A EP4122587A1 EP 4122587 A1 EP4122587 A1 EP 4122587A1 EP 21182715 A EP21182715 A EP 21182715A EP 4122587 A1 EP4122587 A1 EP 4122587A1
Authority
EP
European Patent Office
Prior art keywords
chamber
cone
fluid
mixing system
treated
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.)
Pending
Application number
EP21182715.9A
Other languages
German (de)
English (en)
Inventor
René Pich
Julien Bonnier
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.)
SNF Group
Original Assignee
SPCM SA
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 SPCM SA filed Critical SPCM SA
Priority to EP21182715.9A priority Critical patent/EP4122587A1/fr
Publication of EP4122587A1 publication Critical patent/EP4122587A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—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

Definitions

  • the invention concerns an improved mixing system designed to introduce chemical substances in a fluid to be treated.
  • Some steps of 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, 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.
  • these polymers need premixing with water at a preestablished concentration.
  • said 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 patent document US2012/0199524 describes a clarifier silo comprising a closed container with an internal mixer surrounded by a diffuser with a cylindrical tube.
  • 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.
  • EP3626336 describes a mixing system for the introduction of chemical substances in a fluid to be treated comprising two chambers. Despite great improvement of the performances, there is still a demand to enhance these performances.
  • the mixing system of the invention is characterized by a combination of three different characteristics compared to the prior art.
  • the first characteristic is that the bottom of said system has the form of a cone extending from the external wall, said cone being extended by a tube, and said cone having an internal angle alpha comprised between 10° and 60°, preferably between 15 and 50°, more preferably between 20 and 40°.
  • the bottom of the system has the form of a funnel, respectively a cone continued by a tube.
  • the second characteristic is that end of the tube forms the inlet duct for a fluid to be treated.
  • the third characteristic is that the injection passage of the chemical additives, especially the polymer is positioned on wall of the tube extending from the cone or on the wall of the cone.
  • the internal angle alpha is the angle between the wall of the cone and a plane, said plane being orthogonal to the revolution axis of the cone.
  • 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 ringshaped.
  • 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.
  • the second chamber 17 is concentric and coaxial with the first chamber 16.
  • the inlet duct 19 is positioned at the end of the tube prolonging the cone 14.
  • 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 outlet duct 20, and potentially below a second group of blades 18b, when two groups of blades are used.
  • 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 below the outlet duct 20, and potentially above the first group of blades 18a.
  • 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 conical recirculation space between a lower end 13a of the internal wall 13 and the bottom cone 14.
  • the at least one injection passage 22 for the introduction of a chemical additive is placed on the wall of cone 14 or, preferably on the wall of the tube 23.
  • the bottom part of cone 14A is extended by a vertical and cylindrical tube 23, also called the pre-entry of the cone.
  • the at least one injection passage 22 is preferably placed on said tube 23, preferably perpendicularly to the horizontal axe of said tube 23.
  • the mixing system comprises at least two feet 40 to allow the mixing system to stand in equilibrium.
  • the mixing system can be supported by any other technical means.
  • the mixing system 10 operates in such a way that the fluid to be treated, for example sludge, flows into the bottom of the cone 14 through the inlet duct 19 and, thanks to the action of the stirring blades 18 and downstreams in the first chamber 16, flows upwards, 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 or anionic polyacrylamide, is injected in the fluid to be treated during its passage through the cone 14 or the pre-entry of the cone 23.
  • 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 or an anionic flocculant polymer, is activated when it comes in direct contact with a fluid to be treated.
  • the invention provides a mixing system which, thanks to the stirring effect produced by the stirring blades, thanks to the turbulent effect produced in the conical part, and thanks to the introduction of the chemical additive at the bottom of the mixing system, 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 an improved 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 an improved 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 an improved mixing system that improves water retention from sludge, thus increasing the quantity of dry product obtainable.
  • the invention provides an improved 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 an improved compact mixing system that can be easily set up also in existing wastewater purification or treatment systems or sludge drying systems.
  • the invention provides an improved 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)
EP21182715.9A 2021-06-30 2021-06-30 Système de mélange amélioré pour l'introduction de substances chimiques dans un fluide à traiter Pending EP4122587A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21182715.9A EP4122587A1 (fr) 2021-06-30 2021-06-30 Système de mélange amélioré pour l'introduction de substances chimiques dans un fluide à traiter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21182715.9A EP4122587A1 (fr) 2021-06-30 2021-06-30 Système de mélange amélioré pour l'introduction de substances chimiques dans un fluide à traiter

Publications (1)

Publication Number Publication Date
EP4122587A1 true EP4122587A1 (fr) 2023-01-25

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ID=76730336

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21182715.9A Pending EP4122587A1 (fr) 2021-06-30 2021-06-30 Système de mélange amélioré pour l'introduction de substances chimiques dans un fluide à traiter

Country Status (1)

Country Link
EP (1) EP4122587A1 (fr)

Citations (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
US3392963A (en) 1965-12-23 1968-07-16 Stamicarbon Reactor vessel with a mixing device
US3737288A (en) 1971-06-18 1973-06-05 Exxon Co Antifouling deflector in olefin polymerization reactors
US4036699A (en) * 1976-02-02 1977-07-19 Phillips Petroleum Company Fermentation apparatus and method
US5314076A (en) 1991-02-04 1994-05-24 Gie Anjou-Recherche Installation for the mixing of two fluid phases by mechanical stirring, notably for the treatment of water by transfer of oxidizing gas, and use of such an installation
US20120199524A1 (en) 2011-02-09 2012-08-09 Ccs Midstream Services, Llc. Method and apparatus for treating well flow-back and produced water or other wastewater
EP3626336A1 (fr) 2018-09-21 2020-03-25 Savio Srl Système de mélange pour l'introduction de substances chimiques dans un fluide à traiter

Patent Citations (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
US3392963A (en) 1965-12-23 1968-07-16 Stamicarbon Reactor vessel with a mixing device
US3737288A (en) 1971-06-18 1973-06-05 Exxon Co Antifouling deflector in olefin polymerization reactors
US4036699A (en) * 1976-02-02 1977-07-19 Phillips Petroleum Company Fermentation apparatus and method
US5314076A (en) 1991-02-04 1994-05-24 Gie Anjou-Recherche Installation for the mixing of two fluid phases by mechanical stirring, notably for the treatment of water by transfer of oxidizing gas, and use of such an installation
US20120199524A1 (en) 2011-02-09 2012-08-09 Ccs Midstream Services, Llc. Method and apparatus for treating well flow-back and produced water or other wastewater
EP3626336A1 (fr) 2018-09-21 2020-03-25 Savio Srl Système de mélange pour l'introduction de substances chimiques dans un fluide à traiter

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