EP0367799B1 - Dispositif de dispersion de gaz au sein d'une phase liquide - Google Patents

Dispositif de dispersion de gaz au sein d'une phase liquide Download PDF

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Publication number
EP0367799B1
EP0367799B1 EP88910055A EP88910055A EP0367799B1 EP 0367799 B1 EP0367799 B1 EP 0367799B1 EP 88910055 A EP88910055 A EP 88910055A EP 88910055 A EP88910055 A EP 88910055A EP 0367799 B1 EP0367799 B1 EP 0367799B1
Authority
EP
European Patent Office
Prior art keywords
chimney
liquid phase
lining
venturi
phase
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
EP88910055A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0367799A1 (fr
Inventor
Jacques Bousquet
Alain Catros
Le Xuan Huynh
Alain Secq
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.)
Elf Antar France
Original Assignee
Elf France 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 Elf France SA filed Critical Elf France SA
Publication of EP0367799A1 publication Critical patent/EP0367799A1/fr
Application granted granted Critical
Publication of EP0367799B1 publication Critical patent/EP0367799B1/fr
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
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/45—Mixing liquids with liquids; Emulsifying using flow mixing
    • B01F23/454—Mixing liquids with liquids; Emulsifying using flow mixing by injecting a mixture of liquid and gas
    • 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
    • B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
    • B01F25/21—Jet mixers, i.e. mixers using high-speed fluid streams with submerged injectors, e.g. nozzles, for injecting high-pressure jets into a large volume or into mixing chambers
    • 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
    • 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
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/81—Combinations of similar mixers, e.g. with rotary stirring devices in two or more receptacles
    • 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 present invention relates to a device allowing the transfer of a gaseous phase into a liquid phase, the addition of the gaseous phase being intended to ensure the course of reactions which have to develop subsequently in the liquid phase.
  • This device is mainly intended for carrying out treatments such as chemical, biological and metabolic reactions comprising the transfer of a gaseous phase into a liquid phase, this liquid phase possibly being industrial or domestic water.
  • An intermediate cylindrical piece is interposed between the exit of the divergent and the entry of the chimney. connection. This intermediate part is pierced with lights connecting the interior of the chimney and the liquid phase in which the device is bathed.
  • the device (s) are immersed in a basin or any other type of tank containing the liquid phase.
  • the gaseous phase is introduced at the neck of the venturi and can, as the case may be, be sucked in by the liquid phase which then plays the role of motive fluid or introduced by the combined effect of the pressure due to a gas compressor and the suction due in the liquid phase.
  • the divergent ensures a mixture between the two phases.
  • the chimney and the intermediate cylindrical part placed at the outlet of the divergent considerably reinforce the effect of the venturi by ensuring a large contact area in a relatively confined space which allows to obtain a much better gas / liquid transfer than by current processes. known.
  • the speed of the liquid phase and gas phase mixture in the chimney causes the suction of part of the external liquid phase through the openings of the intermediate cylindrical part.
  • Such an effect is sought in particular whenever the amount of gas contained in the liquid phase / gas phase mixture will be greater than the absorption capacity of the liquid phase.
  • the nature of the material or materials used to make the device has no influence on the effectiveness of the latter. It is the nature of the phases involved which will determine the materials to be used.
  • the connections of the device to the various pipes can be of any type and in particular to be welded, to be glued, to flanges, and to be screwed.
  • the venturi is calculated in such a way that the speed of the flow in the chimney ensures the gas bubbles which are subjected to two influences: the upward flow of the mixture and the archimedean force, a low downward speed allowing the said bubbles to be dissolved as much as possible by the liquid phase.
  • the device which is the subject of the invention can be used for all the processes requiring the transfer of a gaseous phase into a liquid phase, in particular for the treatment of industrial or domestic, used or potable water, in particular for aeration operations air or enriched air, oxygenation, chlorination and ozonation.
  • the devices can be associated in parallel, their number depending on the volume of liquid phase to be treated. Two or more devices can be connected in series, in particular when the conditions for absorption of the gas phase in the liquid phase are difficult, that is to say when the solubility of the gas phase is low under the conditions provided for the treatment, or if a reaction occurs with consumption of the dissolved gas.
  • the device comprises a convergent 1 of angle 40 degrees approximately and length 127 millimeters.
  • a cylindrical part 6 intended for the connection of the piping bringing the liquid phase.
  • the inlet diameter of the convergent 1 is equal to 114 millimeters.
  • the neck 2 of the venturi After the convergent is the neck 2 of the venturi. It has a diameter of 25.4 millimeters and a length of 25.4 millimeters.
  • the neck 2 has equidistant from its two ends a tap 7 projecting externally by 50.8 millimeters and intended for supplying the device by the gas phase.
  • the diameter of this nozzle is 6 millimeters.
  • the diameter is 8 millimeters.
  • the neck 2 is followed by the divergent 3 forming an angle of 10 degrees. Its length is such that the outlet diameter is equal to the inlet diameter of the convergent, ie 506 millimeters.
  • a spacer 4 is inserted between the venturi and the chimney 5.
  • its diameter is equal to 114 millimeters, its length to 114 millimeters.
  • the intermediate piece is perforated by three lights presenting a maximum clearance compatible with its realization.
  • the liquid phase is sent to the input of the devices 12 by means of a pump 9 and a supply ramp 10.
  • the gaseous phase is sent to the neck of the devices 12 by the by means of a compressor 11 and a ramp 13.
  • the basin has a capacity of 1000 cubic meters
  • the pump 9 has a flow rate of 2400 cubic meters per hour at a pressure of 1 bar
  • the compressor 11 has a flow rate of 3.3 cubic meters per minute for a pressure of 0.4 bar.
  • the installation is preferably equipped with 263 devices, each arranged substantially vertically. It provides an oxygenation capacity of 51 grams of oxygen per cubic meter per hour. The gross power required is 30 kilowatts, or a specific power of 30 watts per cubic meter.
  • FIG. 3 makes it possible to compare the values of the transfer coefficients as a function of the speed of the liquid phase, namely 0.2624 meters per second using the device which is the subject of the invention: curve 14 and the coefficients obtained using the devices already known: curves 15 (porous plateau), 16 (classic venturi), 17 (bubble column and static mixer).
  • Curves 16 and 17 were obtained by WANG and AL in 1978, the others experimentally by the inventors. On the abscissa are the surface gas velocities in meter per second, the ordinates show the transfer coefficients in seconds minus one.
  • FIG. 4 makes it possible to compare the values of the oxygenation capacities as a function of the specific powers implemented by the device which is the subject of the invention: curves 18 and 19 (flow rate of the liquid phase equal to 2.5 liters per second for curve 18, liquid phase flow rate equal to 5 liters per second for curve 19) and the coefficients obtained by already known devices: curve 20 (maximum envelope curve of the statistical values relating to fast, slow turbines and brushes), 21 (turbine slow brush) and 22 (fast turbine). Curves 20, 21 and 22 were plotted with the results of measurements cited by CEMAGREF in 1980, the others experimentally by the inventors. In * abscisses are the specific powers in watts per cubic meter, in ordinates are the oxygenation capacities in grams of oxygen per cubic meter and per hour.
  • FIG. 5 to 8 differ from those described above in that they further comprise a lining in the chimney which acts as a bubble breaker and thus prevents the coalescence of the gas bubbles .
  • the device comprises a lining 30 arranged in the chimney 5.
  • the lining is formed by two elements 32 and 34, each comprising a mesh structure 36 as shown in FIG. 9.
  • the mesh structure 36 comprises two series of wires 38 arranged orthogonally forming square meshes which are either welded or entangled.
  • the wires 38 can be, for example, of a material plastic, stainless steel or consist of plasticized metal wires.
  • the first element 32 of the lining 30 is formed of a mesh structure 36 which is rolled up so that it takes on a substantially spiral shape.
  • the second element 34 of the lining 30 is also formed of a mesh structure which is folded so as to have a substantially sawtooth section. Once folded, the grid structure is rolled up to take a shape corresponding to that of the first element.
  • the two elements 32 and 34 are wound together. Once wound up, the lining 30 is mounted inside the chimney 5
  • the lining 30 In order to retain the lining 30 in the chimney 5, it is possible to envisage forming the lining with an external diameter which is between 1.10 and 1.20 times the internal diameter of the chimney 5. In this case, the lining 30 is fitted by force in the chimney 5. One can also provide for forming the lining 30 with an external diameter substantially equal to or slightly less than the internal diameter of the chimney 5. In this case, the device further comprises a means for retaining the lining 30 in place in the chimney 5.
  • the devices shown in Figures 5 to 7 each have a different means for retaining the lining 30.
  • the lining 30 is retained by a locking spring 40 which is substantially C-shaped and which has two arms, extremes 42 directed towards the center of C.
  • the locking spring 40 is mounted around the outside of the chimney 5, the arms 42 passing through openings 44 formed in the chimney 5 to engage the meshes of the element 32.
  • the locking spring 40 is retained in place between two flanges 46 which are each formed by folding back part of the sheet metal of the chimney 5.
  • FIG. 6 differs from that of FIG. 5 in that the locking spring 40 ′ is mounted inside the chimney 5.
  • the arms 42 ′ are folded outwards and pass through openings 44 ′ formed in the chimney 5.
  • a third opening 48 is formed in the chimney and allows a part 50 in the form of a loop of the spring 40 ′ to protrude outside the chimney 5.
  • the locking spring 40 ′ is arranged in the chimney between the lining 30 and the outlet of the chimney 5.
  • the lining 30 comprises two bayonets 52 which are welded to the meshes of the elements 32 and 34.
  • the chimney 5 is provided with two L-shaped recesses 54 which are intended to receive the bayonets 52 thus locking the lining 30 in place.
  • FIG. 8 A second embodiment of the lining 30 is shown in FIG. 8. This lining differs from that of FIGS. 5 to 7 in that the second element is formed of a mesh structure to which a wavy or substantially sinusoidal section has previously been given. .
  • the axial length of the lining 30 is between 10 to 40% of the axial length of the chimney 5.
  • the first element 32 of the lining 30, intended to be used in a device having the dimensions given above, is preferably formed of square meshes having a side of 10 mm made from a wire with a diameter of 0.25 to 0 , 5 mm.
  • the length of each panel is 14.14 mm and the angle between two neighboring panels is 90 °.
  • the wavelength of the corrugations is 20 mm and the amplitude is 10 mm.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP88910055A 1987-11-03 1988-10-27 Dispositif de dispersion de gaz au sein d'une phase liquide Expired - Lifetime EP0367799B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8715219A FR2622470B1 (fr) 1987-11-03 1987-11-03 Dispositif de dispersion de gaz au sein d'une phase liquide et application de ce dispositif a la realisation de traitements comportant le transfert d'une phase gazeuse dans une phase liquide
FR8715219 1987-11-03

Publications (2)

Publication Number Publication Date
EP0367799A1 EP0367799A1 (fr) 1990-05-16
EP0367799B1 true EP0367799B1 (fr) 1992-03-18

Family

ID=9356430

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88910055A Expired - Lifetime EP0367799B1 (fr) 1987-11-03 1988-10-27 Dispositif de dispersion de gaz au sein d'une phase liquide

Country Status (9)

Country Link
US (1) US5073309A (el)
EP (1) EP0367799B1 (el)
JP (1) JPH02502085A (el)
DE (1) DE3869417D1 (el)
ES (1) ES2013358A6 (el)
FR (1) FR2622470B1 (el)
GR (1) GR880100740A (el)
PT (1) PT88911B (el)
WO (1) WO1989004208A1 (el)

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Also Published As

Publication number Publication date
PT88911B (pt) 1993-12-31
US5073309A (en) 1991-12-17
FR2622470A1 (fr) 1989-05-05
PT88911A (pt) 1989-09-14
DE3869417D1 (de) 1992-04-23
WO1989004208A1 (fr) 1989-05-18
FR2622470B1 (fr) 1991-05-10
GR880100740A (el) 1994-03-31
JPH02502085A (ja) 1990-07-12
EP0367799A1 (fr) 1990-05-16
ES2013358A6 (es) 1990-05-01

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