EP2025392B1 - Commande d'une installation de cavitateur - Google Patents

Commande d'une installation de cavitateur Download PDF

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Publication number
EP2025392B1
EP2025392B1 EP08161421A EP08161421A EP2025392B1 EP 2025392 B1 EP2025392 B1 EP 2025392B1 EP 08161421 A EP08161421 A EP 08161421A EP 08161421 A EP08161421 A EP 08161421A EP 2025392 B1 EP2025392 B1 EP 2025392B1
Authority
EP
European Patent Office
Prior art keywords
cavitator
pressure drop
path
cavitators
minimum pressure
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.)
Not-in-force
Application number
EP08161421A
Other languages
German (de)
English (en)
Other versions
EP2025392A3 (fr
EP2025392A2 (fr
Inventor
Herbert Stock
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.)
Cavitator Systems GmbH
Original Assignee
Cavitator Systems GmbH
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
Priority claimed from DE102007052642A external-priority patent/DE102007052642B4/de
Application filed by Cavitator Systems GmbH filed Critical Cavitator Systems GmbH
Publication of EP2025392A2 publication Critical patent/EP2025392A2/fr
Publication of EP2025392A3 publication Critical patent/EP2025392A3/fr
Application granted granted Critical
Publication of EP2025392B1 publication Critical patent/EP2025392B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B01F23/41—Emulsifying
    • 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
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4311—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being adjustable
    • 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
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4319—Tubular 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
    • B01F25/40—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
    • B01F25/434—Mixing tubes comprising cylindrical or conical inserts provided with grooves or protrusions
    • 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
    • B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
    • 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
    • B01F33/812—Combinations of similar mixers, e.g. with rotary stirring devices in two or more receptacles in two or more alternative mixing receptacles, e.g. mixing in one receptacle and dispensing from another receptacle
    • 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
    • B01F33/813—Combinations of similar mixers, e.g. with rotary stirring devices in two or more receptacles mixing simultaneously in two or more mixing receptacles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/211—Measuring of the operational parameters
    • B01F35/2115—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/213—Measuring of the properties of the mixtures, e.g. temperature, density or colour
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/2201—Control or regulation characterised by the type of control technique used
    • B01F35/2202—Controlling the mixing process by feed-back, i.e. a measured parameter of the mixture is measured, compared with the set-value and the feed values are corrected

Definitions

  • the invention relates to a hydrodynamic cavitation mixer.
  • the so-called cavitation bubbles occurs near the interface between two phase areas, say large gas bubbles in water, the second component, in this case the gas bubbles, is torn into smaller units and thereby a very fine mixing of the two components and thus produces a very stable gas-water mixture.
  • cavitation bubbles is done in a flowing liquid by a drop in the static pressure below the vapor pressure of the liquid, thereby forming vapor-filled gas bubbles, eg. B. due to a current narrowing.
  • the constriction and subsequent expansion of the flow cross section can be achieved by an obstacle body is arranged in a flow chamber, wherein the remaining gap z. B. between obstacle body and surrounding housing of the flow chamber forms the bottleneck.
  • cavitation fields forming in the cavities field form in the cavities between the obstacle bodies, and the spatial superposition of the individual cavitation fields creates a so-called super-cavitation field, which causes a multiplication of the cavitation effect of each individual cavitation field.
  • the static pressure which falls short of the cavitation effect, becomes zero or negative in the case of water if the flow velocity exceeds a certain value dependent on environmental conditions, for example about 14 m / s at the trailing edges of the obstacle bodies.
  • Cavitators of this kind are used, for example, in mineral water bottling plants or lemonade production, in order either to bind the added CO 2 as completely as possible in the water, and / or also to add the soda-based raw material (syrup).
  • the quantity of the product delivered per unit time and to be processed that is to say above all the main components of the beverage, can change greatly, depending on the operating state of the upstream plant parts or else the availability.
  • z. B by changing the product whose properties change, for example, its temperature, viscosity, delivery pressure, etc ..
  • a method of treating wastewater using cavitation is known.
  • several pressure relief valves are arranged, which are connected to discharges and thus prevent an overpressure builds up in the line. If an excessively high pressure occurs upstream or downstream of the cavitator, one of the overpressure valves opens and diverts a portion of the fluid located in the main line into a water reservoir.
  • the Cavitator can be controlled due to the pressure drop measured at the Cavitator distance become.
  • the Cavitator distance can consist of one or more, in this case then usually connected in parallel, Cavitatoren.
  • a minimum pressure drop must be set which must occur at the cavitator path so that cavitation and thus the desired effect of mixing occur within the cavitator.
  • the multiple treatment in the Cavitator increases the temperature of the medium to be treated, which is disadvantageous for many applications.
  • the fluid to be treated is thereby not only subjected to simple but multiple loads occurring in the cavitator, for example, high shear forces, which may be disadvantageous depending on the fluid to be treated.
  • a particularly simple way to gradually increase the proportion of the recirculated partial flow is to split the line into several parallel arms and install in each of these arms a simple shut-off valve, which are much cheaper and easier to control than a control valve.
  • the return is also to a point before the mixing point of the components supplied in the main component.
  • the pressure drop is measured continuously and the results of the pressure measurement fed to a controller that regulates the flow through the return line.
  • a particularly simple control that offers this is a simple differential pressure controller. In general, however, a more complex control is used, which can also take over other control functions.
  • the physical properties of the product such as temperature, viscosity, etc. are measured and also the pressure, preferably the pressure after the pump, so the working pressure at the entrance to the Cavitator. Since the pressure drop is determined anyway by determining the pressures in front of and behind the cavitator, one of these individual pressures is already the pressure at the entrance to the cavitator.
  • the adjustment to too low a flow can also be achieved by - at least once a minimum pressure drop across the cavitator path has previously been established Cavitator or sequentially disabled several cavitators, so be closed until the minimum pressure drop is reached over the Cavitator distance with the remaining in-use cavitators, so at least one in-service cavitator.
  • the Cavitator route includes two or more equally sized cavitators, falls below the minimum pressure drop one by one of these Cavitatoren sequentially shut down until only one Cavitator operated becomes.
  • the individual, each next larger Cavitatoren always behave to each other in the same size ratio, for example, 1: 2 or 1: 4.
  • cavitator path where not all cavitators are currently in operation, additional cavitators are activated when the instantaneous pressure drop is greater than 30%, and more than 50%, above the predetermined minimum pressure drop. This avoids excessive energy loss and excessive shear stress on the medium.
  • cavitational cavitation may be controlled and adjusted by changing the gap size as well ,
  • the obstacle bodies are arranged axially one behind the other at a distance, disk-shaped bodies which are arranged on an axially extending rod.
  • disk-shaped bodies which are arranged on an axially extending rod.
  • a particularly simple control is possible because the Obstisbäumchen can only be adjusted back and forth between two end positions, which can be done in a simple manner by means of a compressed-air cylinder.
  • a finer control option is given if the axial adjustment can be done in several stages or even continuously, for which the tree must be moved, for example by means of a servo motor.
  • the continuous adjustment of the gap size is then carried out in direct dependence on the currently measured pressure drop over the Cavitator distance, so that the required minimum pressure drop is just reached.
  • the gap width can only be varied between two positions, is switched with set large gap width to the smaller gap width as soon as the minimum pressure drop is exceeded. Conversely, switching from smaller to larger gap width is made as soon as the minimum pressure drop is exceeded by more than 20%.
  • the minimum pressure drop is set so that, for example, in water as the product to be processed, or a product whose main component is water, at a processing temperature of 20 ° C with deviations of +/- 2 ° C, a flow rate of at least 15 m per Second in Cavitator, especially at all bottlenecks in Cavitator, reached or exceeded. This corresponds to z. B. a minimum pressure drop of 4.0 bar above the Cavitator route.
  • a Cavitator system can now have several influencing options at the same time:
  • the cavitators are variable with respect to the gap width, with a decrease in pressure drop below the minimum pressure drop, first several sequentially reduced to all Cavitatoren the Cavitator distance from a large gap to a small gap if only two positions of the gap width possible are.
  • the gap width is increasingly lowered, preferably parallel in all cavities of the distance until the minimum pressure drop is reached.
  • the switching off one or more successive Cavitatoren is the primary choice for influencing the Pressure drop, and only if this is not sufficient, in addition, the gap width reduction and the increase of the return portion - in this order - additionally used.
  • control priority is, as a first measure, to reduce the gap width for all cavitators of the cavitator path that are still continuous, and only if this is not sufficient to deactivate one or more cavitators. Again, the last level of influence is the increase in the proportion of recirculation through the return line.
  • the gap widths within a cavitator on the individual obstacle bodies can usually only be adjusted together, for example, by axial displacement of the entire, conical from the outer circumference, obstacle trees into the conical housing of the Cavitators.
  • the proportion of the returned via the return partial flow from the controller can also be controlled depending on the pressure drop across the Cavitator distance.
  • each cavitator For shutting off, ie deactivating, the individual cavitators in the cavitator path, each cavitator preferably has check valves both in front of and behind the cavitator to prevent kickbacks and contamination in and out of the disused cavity.
  • the measuring points which measure the pressure difference over the Cavitator distance, are on the one hand between the end of the Cavitator distance and the branch for the return, thus still on the unbranched main distance behind the Cavitator and on the other hand between the pump and the Entry into the Cavitator track to capture the full initial working pressure towards the Cavitator track.
  • the control valve in the return line is preferably arranged near the end of the return line, ie the mouth point in the main line.
  • a feed line for a second component is present, this is in terms of their mouth in the main strand between the mouth of the return line and the pump, but preferably has a cross-connection to the return line, which opens upstream of the control valve in the feed line.
  • FIG. 1 shows a Cavitator plant, in which in the main flow direction 10, a fluid to be processed, usually water or a product whose main component is water, fed and passed through a Cavitator distance 1, consisting of one or more, in this case two equal cavitators 1a, b connected in parallel.
  • the fluid to be processed is brought by a pump 4, which is arranged in front of the Cavitator distance 1 in the main strand to the required pressure, which depends on the physical properties of the fluid to be processed and others Parameter is.
  • the Cavitator system is used as a mixer, which is why the flowing in the main flow direction 10 fluid via a feed line 17, a second component, in this case CO 2 , is supplied.
  • the feed line opens in the main line in a mixing point 5, which opens upstream of the pump 4, so that the complete mixture of the pressure increase is supplied by the pump 4.
  • the main strand branches off after the Cavitator-line 1, a return line 3 at point 3a and performs a partial flow 2a of the main stream 2 in the circle back to the main line to a point 3b, the upstream of the pump 4 and also upstream of the mixing point 5 for the second component.
  • This recirculation serves only to supply the required minimum flow rate through the cavitator section 1 in the case of small amounts of fluid to be processed per unit time in the main flow direction necessary to achieve the minimum pressure drop across the cavitator path necessary for the function of the cavitators.
  • the pressure drop across the cavitator path is measured by a differential pressure measuring device 15, which passes on its results to a controller 6, which can also be functionally combined with the differential pressure measuring device.
  • This control 6 controls the arranged in the return line 3 control valve 7, which is a control valve and can control the flow through the return line 3 steplessly.
  • the pressure measuring points 16a, b are on the one hand between the pump 4 and the entrance to the Cavitator distance 1 and on the other hand between the Cavitator distance 1 and the junction point 3a of the return path 2a.
  • the control valve 7 is preferably located near the mouth point 3b of the return line in the main line 10th
  • each of the parallel-connected cavitators 1a, b of the cavitator section 1 can be shut down separately, ie closed, by blocking valves 18a, b arranged in front of and behind the respective cavitator 1a.
  • check valves 18a, b in each cavitator 1a, b ... are controlled by the controller 6, so that each individual cavitator can be activated and deactivated.
  • each cavitator 1a, b is the - in FIG. 2 shown obstacle trees 12 with the attached obstacle bodies 14a, b in the axial direction 10 of the Cavitators between two end positions by means of an air cylinder 13a displaceable, which due to the conical design of both the Obstisbäumchens and the surrounding Cavitatorgephaseuses the gap width 11 from large to small gap width and vice versa can be adjusted.
  • this adjustment causing air cylinder 13a, b are controlled by the controller 6 from.
  • the measuring points for the differential pressure measurement by the measuring device 15 are located downstream of the Cavitator-line 1 between the end of the Cavitator-1 route and the branch 3a for the return 3 and upstream of the Cavitator-track 1 between the pump 4 and the Cavitator-stretch 1.
  • a connecting line 19 which branches off in the feed line 17 between the metering valve 20 and the mixing point 5 with the main strand.
  • This connecting line and the other valves contained in the feed line and connecting line 19 are used both in the feed line and in the return line for cleaning purposes.
  • the metering valve 20 in the feed line 17, which controls the supply to the second component can advantageously be controlled directly by the existing controller 6.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Accessories For Mixers (AREA)
  • Flow Control (AREA)

Claims (7)

  1. Procédé pour l'adaptation d'une installation de cavitateur avec un trajet de cavitateur (1), qui présente un cavitateur (1a) ou plusieurs cavitateurs montés parallèlement (1a, b...),c
    caractérisé en ce
    - qu'au moins une chute de pression minimale est déterminée sur le trajet de cavitateur (1) en tenant compte des propriétés du fluide à traiter,
    qu'en cas de dépassement de la chute de pression minimale, un courant partielle (2e) est ramené de la fin du trajet de cavitateur (1) dans le circuit par un trajet de recirculation (3) avant le début du trajet de cavitateur (1), de sorte que la quantité amenée au trajet de cavitateur (1) est augmentée par unité de temps pour assurer la manifestation de la cavitation.
  2. Procédé selon la revendication 1, caractérisé en ce que
    - la partie du courant partiel remise en circulation (2a) est une partie fixe, en particulier 50 % d'un courant principal (2).
  3. Procédé selon la revendication 1, caractérisé en ce que
    - la partie du courant partiel remise en circulation (2a) est modifiée en continu de sorte que la chute minimale de pression est juste atteinte.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que
    - le retour s'effectue à un point devant la pompe (4) fournissant la pression de travail pour le trajet de cavitateur (1).
  5. Procédé selon l'une des revendications précédentes,
    caractérisé en ce qu'en cas d'une installation de cavitateur utilisée comme mélangeur, la remise en circulation s'effectue à un point devant un point de mélange (5) de deux composants.
  6. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    - la chute de pression minimale est déterminée en tenant compte des propriétés du produit à traiter, en particulier au moins des propriétés des composants principaux du produit.
  7. Procédé selon l'une des revendications précédentes,
    caractérisé en ce qu'
    - une chute de pression minimale est déterminée sur le trajet de cavitateur (1) en particulier en tenant compte des propriétés, en particulier de la température du produit à traiter.
EP08161421A 2007-07-30 2008-07-30 Commande d'une installation de cavitateur Not-in-force EP2025392B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007035629 2007-07-30
DE102007052642A DE102007052642B4 (de) 2007-07-30 2007-11-05 Steuerung einer Cavitator-Anlage

Publications (3)

Publication Number Publication Date
EP2025392A2 EP2025392A2 (fr) 2009-02-18
EP2025392A3 EP2025392A3 (fr) 2010-03-17
EP2025392B1 true EP2025392B1 (fr) 2012-05-23

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ID=39877904

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Application Number Title Priority Date Filing Date
EP08161421A Not-in-force EP2025392B1 (fr) 2007-07-30 2008-07-30 Commande d'une installation de cavitateur

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EP (1) EP2025392B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9815034B2 (en) 2012-04-18 2017-11-14 Egm-Holding-International Gmbh Method for emulsion treatment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202022102005U1 (de) 2022-04-13 2022-05-23 Cvt Gmbh & Co. Kg Vorrichtung zur Reinigung von Wasser und System zur Reinigung von Wasser

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Publication number Priority date Publication date Assignee Title
US4127332A (en) * 1976-11-19 1978-11-28 Daedalean Associates, Inc. Homogenizing method and apparatus
SU745050A1 (ru) * 1977-10-07 1981-08-07 Кировский Политехнический Институт Кавитационный реактор
SU1590124A1 (ru) * 1988-04-08 1990-09-07 Институт технической механики АН УССР Устройство дл получени тонкодисперсных систем
US5326468A (en) * 1992-03-02 1994-07-05 Cox Dale W Water remediation and purification method and apparatus
DE4433744C2 (de) * 1994-09-21 2001-02-22 Schueler Rolf Vorrichtung zum Vermischen von Medien zur Erzeugung flüssiger Systeme
US5951922A (en) * 1998-02-10 1999-09-14 Mazzei; Angelo L. Aeration system for substantial bodies of water
DE10009326A1 (de) * 2000-02-28 2001-08-30 Rs Kavitationstechnik Kavitationsmischer
KR20020036884A (ko) * 2000-11-11 2002-05-17 김완모 캐비테이팅 워터젯을 이용한 오폐수 처리 시스템
US20030111429A1 (en) * 2001-12-14 2003-06-19 Montalvao Antonio Filipe Falcao Cavitation method and apparatus for deaeration
US7428797B2 (en) * 2002-12-23 2008-09-30 Sergey Borisovich Osipenko Method for dispergating plant seeds and device for carrying out said method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9815034B2 (en) 2012-04-18 2017-11-14 Egm-Holding-International Gmbh Method for emulsion treatment

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Publication number Publication date
EP2025392A3 (fr) 2010-03-17
EP2025392A2 (fr) 2009-02-18

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