EP0305251B1 - Injektormischer unter Druck - Google Patents

Injektormischer unter Druck Download PDF

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Publication number
EP0305251B1
EP0305251B1 EP88402000A EP88402000A EP0305251B1 EP 0305251 B1 EP0305251 B1 EP 0305251B1 EP 88402000 A EP88402000 A EP 88402000A EP 88402000 A EP88402000 A EP 88402000A EP 0305251 B1 EP0305251 B1 EP 0305251B1
Authority
EP
European Patent Office
Prior art keywords
air
mixing
injector
inlet
pipe
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.)
Expired - Lifetime
Application number
EP88402000A
Other languages
English (en)
French (fr)
Other versions
EP0305251A1 (de
Inventor
Jean-Pierre Lamort
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.)
Stora Feldmuehle AG
Kadant Lamort SAS
Original Assignee
Stora Feldmuehle AG
E&M Lamort Fils 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 Stora Feldmuehle AG, E&M Lamort Fils SA filed Critical Stora Feldmuehle AG
Publication of EP0305251A1 publication Critical patent/EP0305251A1/de
Application granted granted Critical
Publication of EP0305251B1 publication Critical patent/EP0305251B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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

  • paper pulp undergoes numerous purification, separation and various filtration, decontamination and de-inking treatments.
  • the present invention relates to devices for injecting liquid and air under pressure mixture, and in particular to devices for mixing paper pulp and air, used in decontamination and deinking cells by flotation.
  • One of the known techniques of decontamination and deinking consists in injecting air into the dough to be treated, at the entry of the cell. The air traps the charges and the ink particles in bubbles, and entrains them towards the surface to form a foam which is then sucked towards a separator.
  • the quality of deinking depends in particular on the quality of the mixture obtained in the injector: it is indeed necessary that the dough is very aerated in order to retain the maximum quantity of particles in the air bubbles and this aeration must be the most homogeneous and the most evenly distributed in the dough: the bubbles must be very small; and avoid even the irregular presence of large bubbles.
  • Injectors are generally used comprising a pressurized liquid inlet and a nozzle-shaped outlet; between the inlet and the outlet there is an air inlet and a cylinder in which the air, sucked in by the flow of the liquid, mixes there before reaching the conical part of the outlet.
  • a device of this kind is described in patent CH-A-581,493.
  • injector-mixers in which the dough flows in a tubular pipe in the form of a nozzle.
  • a profile of longitudinal section in the shape of a wing In the narrowest part is housed a profile of longitudinal section in the shape of a wing. The air is introduced approximately radially into the narrowest part.
  • Such a device is described in patent WO-A-85 01888.
  • the amount of air drawn into this type of injector is mainly a function of the supply pressure; it can for example be of the order of 150% of the volume of liquid; however, the problem is not so much to obtain a large flow of aspirated air but rather to ensure a large and constant homogeneity of the liquid-air mixture.
  • the liquid flow rate accepted by an injector cannot be increased indefinitely, by enlarging the section of the mixing cylinder: there is a maximum section. For example, it turns out that for a diameter greater than about 8mm, the aeration becomes irregular: formation of large bubbles, variable air flow, lower quality inking.
  • GB-A-1,582,898 describes another injection and mixing device in which the liquid supply line is divided into a plurality of small nozzles, opening into a common chamber supplied with air. Opposite each of these nozzles, there is a venturi-shaped outlet.
  • this device can function as a pump, it does not give satisfactory results in this deinking: the bubbles are irregular and burst, allowing the ink to escape.
  • the present invention aims to inject a liquid-air mixture at high flow rate, strong and regular aeration of the liquid and which solves the problems of clogging.
  • the injector 1 is generally cylindrical in shape and comprises a plurality of parallel and preferably identical injection tubes 2: six peripheral tubes 2 regularly distributed in a ring around a central tube, each being equal distance from its immediate neighbors.
  • the invention is not limited to this exemplary embodiment and the injector 1 can comprise a greater or lesser number of tubes, or even comprise only one.
  • Each tube has an inlet pipe 3 for the liquid, an aeration zone 4 for mixing the liquid and the air, and an outlet pipe 5.
  • the inlet pipe 3 comprises a converging truncated cone 6, followed by a cylinder 7, both of circular sections.
  • the cylindrical section 7 can be very short, it can even be nonexistent, its function is to stabilize the direction of flow after the inlet cone 6.
  • each tube has different frustoconical and cylindrical parts.
  • the cylindrical chamber 8 is a single volume, common to all the injection tubes 2 so that the injector comprises a bundle of inlet tubes 3 which all open into the chamber 8, and a bundle of outlet tubes 5 , which leave from chamber 8 towards the outlet of injector 1.
  • the chamber 8 in fact has vis-a-vis the liquid an air layer 23 which the plane jet must pass through; this blade is preferably perpendicular to the longitudinal axis 24 of the injector.
  • the jet in the space of the room is thus permanently entirely surrounded by air and it can aerate as much as possible.
  • the blade 23 is limited to a chamber-shaped space 8, but it is also possible not to limit the space to a chamber, by separating the inlet parts from the mixing and outlet parts , and keeping them aligned coaxially with a certain distance between them. With such a variant the jet would pass through an air space 23 not limited to the walls of a chamber.
  • the diameter 13 of the mixing cylinder is greater than the outlet diameter 14 of the inlet cylinder 7 in order to accept a flow of aerated liquid, which is greater than the flow of liquid alone, and the inlet diameter 15 of the funnel centering 10 is substantially greater than the diameter 14 of the inlet cylinder 7 in order to present a large surface for receiving the jet of liquid coming from the cylinder 7.
  • the air inlet pipe 9 into the chamber 8 is arranged tangentially and perpendicular to the direction of the tubes 2 in order to create a rotating movement, promoting the mixing of the air in the liquid and above all promoting the cleaning of said chamber.
  • the liquid then arrives in the cylindrical part 11 of the mixing zone 4 where the air-liquid mixture is produced in the form of bubbles of very small dimensions and where the ink and the contaminants are trapped.
  • the mixture enters and crosses the divergent outlet cone 12, which is a draw cone.
  • Such multiple injectors provide both the advantages of large injectors (large flow) and small injectors (maximum ventilation) without having the disadvantages (significant maintenance, expensive equipment: valves, ...)
  • the injector 1 is produced in two parts 20, 21 assembled one against the other by screwing 22: the input part 20 comprises the input zone 3, the output part 21 comprises the centering funnel 10, the mixing cylinder 11, and the outlet cone 12.
  • a cylindrical recess is provided on one of the parts 20 or 21 (in the example it is the part 20) to form the chamber 8 which defines a cavity in the form of an air knife 23.
  • a cavity is dug laterally in the hollowed out room to form the tangential air inlet 9.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physical Water Treatments (AREA)
  • Paper (AREA)

Claims (5)

  1. Vorrichtung zum Mischen von Papierbrei und Luft in Form eines Druck-Injektors mit einer axialen Zufuhr von Brei unter Druck, einer seitlichen Luftzufuhr, wenigstens einem Injektorrohr (2), das nacheinander einen sich verjüngenden Einlaßkanal (7), einen Belüftungsraum (8), einen Trichter (10) zur Aufnahme und Zentrierung des Strahls, einen zylindrischen Mischkanal sowie einen sich verbreiternden Auslaß- und Abzugskanal aufweist, dessen Länge mindestens gleich der des Mischkanals ist und in dem die Zufuhr von Luft unter Atmosphärendruck erfolgt,
    gekennzeichnet durch folgende Kombination:
    - der Belüftungsraum (8) ist eben in Form einer Kreisscheibe (23) ausgebildet, die durch die Wände (25) einer zylindrischen Kammer, deren Achse parallel zur Achse (24) des Injektors verläuft, begrenzt wird, wobei der Belüftungsraum (8) eine Weite von wenigstens 5 mm aufweist, der Einlaßkanal (7) senkrecht quer in diesen einmündet und der Belüftungsraum tangential so gespeist wird, daß ein in der Kammer umlaufender Luftstrom ausgebildet wird;
    - die Länge des Mischkanals (11) liegt zwischen dem 4- und 9-fachen seines Durchmessers (13), und
    - der Kegel-Öffnungswinkel α des Auslaßkanals liegt zwischen 1° und 3°.
  2. Vorrichtung zum Mischen von Flüssigkeit und Luft nach Anspruch 1, dadurch gekennzeichnet, daß der Lufteinlaß (9) horizontal am unteren Teil des Injektors (1) angeordnet ist.
  3. Vorrichtung zum Mischen von Flüssigkeit und Luft nach Anspruch 1, dadurch gekennzeichnet, daß der Injektor (1) eine Mehrzahl von parallelen Injektorrohren (2) aufweist, die kranzförmig um ein zentrales Injektorrohr (2) herum angeordnet sind und alle die gleichen Abmessungen aufweisen.
  4. Vorrichtung zum Mischen von Flüssigkeit und Luft nach Anspruch 1, dadurch gekennzeichnet, daß der Einlaßdurchmesser (15) des Trichters (10) höchstens gleich dem 1,5fachen des Durchmessers des Einlaßkanals (7) und die Länge des Trichters gleich seinem Einlaßdurchmesser (15) ist.
  5. Vorrichtung zum Mischen von Flüssigkeit und Luft nach Anspruch 1, dadurch gekennzeichnet, daß die Weite der Belüftung höchstens 15 mm beträgt.
EP88402000A 1987-08-07 1988-08-01 Injektormischer unter Druck Expired - Lifetime EP0305251B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8711273A FR2619023B1 (fr) 1987-08-07 1987-08-07 Injecteur melangeur sous pression
FR8711273 1987-08-07

Publications (2)

Publication Number Publication Date
EP0305251A1 EP0305251A1 (de) 1989-03-01
EP0305251B1 true EP0305251B1 (de) 1992-07-08

Family

ID=9354020

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88402000A Expired - Lifetime EP0305251B1 (de) 1987-08-07 1988-08-01 Injektormischer unter Druck

Country Status (6)

Country Link
US (1) US4842777A (de)
EP (1) EP0305251B1 (de)
JP (2) JPH01159038A (de)
DE (1) DE3872624T2 (de)
ES (1) ES2034320T3 (de)
FR (1) FR2619023B1 (de)

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Also Published As

Publication number Publication date
JPH01159038A (ja) 1989-06-22
FR2619023B1 (fr) 1991-04-12
ES2034320T3 (es) 1993-04-01
DE3872624D1 (de) 1992-08-13
FR2619023A1 (fr) 1989-02-10
US4842777A (en) 1989-06-27
JPH07519U (ja) 1995-01-06
EP0305251A1 (de) 1989-03-01
DE3872624T2 (de) 1993-02-25
JPH0730122Y2 (ja) 1995-07-12

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