EP0486933B1 - Apparatus for dissolving solid bulk material in a liquid - Google Patents

Apparatus for dissolving solid bulk material in a liquid Download PDF

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Publication number
EP0486933B1
EP0486933B1 EP91119336A EP91119336A EP0486933B1 EP 0486933 B1 EP0486933 B1 EP 0486933B1 EP 91119336 A EP91119336 A EP 91119336A EP 91119336 A EP91119336 A EP 91119336A EP 0486933 B1 EP0486933 B1 EP 0486933B1
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EP
European Patent Office
Prior art keywords
liquid
line
container
sugar
circulation line
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EP91119336A
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German (de)
French (fr)
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EP0486933A3 (en
EP0486933A2 (en
Inventor
Angelo Cadeo
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Tetra Pak Processing Equipment AG
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Miteco AG
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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
    • B01F21/00—Dissolving
    • B01F21/20—Dissolving using flow mixing
    • 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
    • B01F25/25—Mixing by jets impinging against collision plates
    • 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
    • B01F25/53—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle in which the mixture is discharged from and reintroduced into a receptacle through a recirculation tube, into which an additional component is introduced
    • 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
    • B01F33/40—Mixers using gas or liquid agitation, e.g. with air supply tubes
    • B01F33/404—Mixers using gas or liquid agitation, e.g. with air supply tubes for mixing material moving continuously therethrough, e.g. using impinging jets

Definitions

  • the invention relates to a device for dissolving solid bulk material in a liquid, a liquid in a container circulating, having a first supply line for the solid bulk material, a second supply line for the liquid and a circulating line for the circulating liquid, wherein these lines open into the container, with an outlet nozzle located in the container, to which a baffle plate faces.
  • the device is intended in particular for large-area solvents (large-scale mixers) in which the bulk solids are present, for example, as sugar, which is to be dissolved, for example, in water.
  • large-volume solvent the container is charged in batches, with liquid being placed in the container, depending on the final concentration, whereupon the sugar is blown in with air during a specific loading time.
  • the loading time can extend, for example, over an hour, with large amounts of conveying air of, for example, 480 Nm3 / h to 800 Nm3 / h being introduced into the container. This conveying air must of course be led away from the container.
  • the aim is to create a device in which no air separator and no filter are necessary and the conveying air can nevertheless be released into the atmosphere without dust.
  • the device according to the invention is characterized in that the first feed line and the circulation line are brought together to form an outlet section which carries the outlet nozzle, so that the flows from the first feed line and the circulation line emerge at the outlet nozzle and hit the baffle plate.
  • the large-volume solvent shown in FIG. 1 has a container 1, a first feed line 2 for the bulk solids and a second feed line 3 for a liquid supply.
  • the two supply lines 2 and 3 open into the container 1.
  • the device also has a circulation line 6 for the circulating liquid.
  • This circulation line 6 comprises a suction section 6 'and a pressure section 6''.
  • At the bottom of the container 1 there is still a line 7 for complete Final emptying of the container.
  • the exhaust air line 8 is located at the top of the container. The dust-free conveying air should flow out of this, without the need for a cyclone separator and a filter.
  • the circulation line 6 has an L-shaped elbow 9 in the interior of the container 1 and the first feed line 2 opens into the circulation line 6 in the region of the elbow 9.
  • the first feed line 2 has an enlarged nozzle 10 at its mouth.
  • the line section between the expanded nozzle 10 and the outlet nozzle 4 designed as a compression nozzle is to be referred to as the outlet section 11 of the circulation line 6.
  • the circulation line 6 with its pressure section 6 ′′, the elbow 9 and the outlet section 11 forms, together with the first feed line 2 and its nozzle 10, a jet pump, which in the present case is designed as a liquid jet solid suction device. If sugar is to be dissolved in water, this jet pump is a water jet sugar sucker. A small negative pressure then occurs at the nozzle 10 due to the circulating liquid.
  • the outlet nozzle 4 the currents emerge from the first feed line 2 and the circulation line 6 and hit the baffle plate 5.
  • the circulation line 6 has the outlet section 11 and the first feed line 2 opens into the circulation line 6.
  • the first feed line 2 it would also be possible for the first feed line 2 to have the outlet section and the circulation line into the first feed line 2 flows into.
  • a minimum liquid level 13 is specified in the container 1 and is indicated by the marking 12.
  • the container 1 is loaded with the liquid (water) and the bulk solids in batches (Sugar) loaded.
  • the valve 14 is closed.
  • the system is a so-called large area solver.
  • the structure of the system shown in FIG. 1 could also be part of a continuously operating system, so that the container 1 would then usually be referred to as a suspension container, and in addition to this container 1 there would also be a release chamber (not shown).
  • the device according to the invention is primarily of interest for the large-area solvent mentioned, since in this the sugar is conveyed into the interior of the container 1 with large amounts of air.
  • the baffle plate 5 is held in the outlet section 11 by means of a rod 16, for example via a three-pointed, star-shaped holder 17.
  • a pump 18 and a shut-off valve 19 are located in the circulation line 6.
  • a line 20 leads away from the circulation line 6, via which the finished sugar solution is led away from the container 1.
  • a shut-off valve 21 is located in line 20.
  • baffle plate 5 which is known per se.
  • the jet emerging from the nozzle 4 strikes the baffle plate 5 essentially at right angles, so that the aforementioned jet (axial jet) is then deflected into a star-shaped, diverging, radial jet.
  • this baffle plate is already used to generate the radial jet, with the circulating liquid again and again hits this baffle plate 5.
  • a particularly strong turbulent flow in the circulating medium is achieved through this baffle plate.
  • the circulating medium liquid with solids dissolved and suspended in it) is sucked in by the pump 18 via the suction section 6 'and led back to the baffle plate 5 via the pressure section 6''.
  • the sugar supply line 2 (with the valve 14 open) is now introduced into the circulation line 6.
  • the nozzle 10 of the line 2 together with the outlet section 11, forms a jet pump, a large turbulent flow occurring in the outlet section 11 and the circulating liquid being very strongly mixed with the sugar supplied via the line 2.
  • the solid due to the great turbulence, the solid (sugar and sugar dust) is intensely and thus quickly bound by the liquid.
  • This flow medium (liquid + solids + sugar solution + air) passes through the compression nozzle 4, in which its speed increases on the baffle plate 5.
  • the aforementioned thorough mixing and intensive binding of the solid to the liquid occurs, but in addition a very special advantageous effect now occurs.
  • the aforementioned large amount of air is divided into many small air bubbles by the baffle plate 5. These many small air bubbles slowly come to the liquid surface 13 due to their lower buoyancy. These many small air bubbles can only contain insignificant sugar dust, which can easily be bound to the liquid when rising in the liquid, so that the total amount of air is distributed through the smallest air bubbles sugar-free enters the gas space 22 and therefore a sugar-free conveying air can also be discharged via the line 8.
  • the advantage therefore lies both in the division of the large amount of air into innumerable smallest air bubbles, which can only contain insignificant sugar dust, and in the increased contact time achieved by the smallest air bubbles when the smallest air bubbles rise slowly, so that these two effects ensure sugar-free removal the conveying air from the container 1 is reached.
  • the procedure for working with the device according to the invention is as follows. First, with the valve 15 open, a batch of a certain amount of liquid is fed to the container 1 via the line 3 (for example 1/3 of the height of the container). Then the valve 15 is closed. The valve 21 was already closed before the filling process. Now the pump 18 is switched on, the valve 19 is opened and a predetermined amount of sugar is supplied to the container 1 via the line 2, for example from a truck with the valve 14 open, the aforementioned large amount of air at a speed, for example in the range of 15-20 m / s while, for example, introduces the sugar into the liquid for one hour. The liquid 23 is explained in FIG Circulated (circulated) way over the circulation line 6.
  • a negative pressure is generated at the mouth end of the line 2, so that the circulating liquid is prevented from entering the line 2, so that no liquid is conveyed to the truck from which the sugar is removed.
  • the many small air bubbles are generated in the manner described by the baffle plate 5, so that the entire amount of air comes into contact with the liquid through a substantially increased contact area and during a considerably longer contact time.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Accessories For Mixers (AREA)
  • Paper (AREA)

Abstract

In enlarge dissolvers, for example, the sugar and sugar dust (2) carried by the transfer air is to be bound as intensively and hence as rapidly as possible by the liquid (23). It should be possible to work without a cyclone separator and without filters. For this purpose, the solid bulk material to be dissolved, for example sugar, is fed directly to the outlet region (11) of the circulation line (6, 6', 6'') of the circulating liquid before the latter strikes the impingement plate (5). The solid bulk material, for example sugar, is, with highly turbulent flow of the liquid, intensively mixed with the latter in the outlet section (11), and is partially dissolved, and the stream issuing from an outlet nozzle (4) of the outlet section (11) strikes the impingement plate (5). The transfer air is split by the latter into a multiplicity of small air bubbles which, rising slowly in the liquid (23), permit rapid binding of the sugar dust to the liquid. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zum Lösen von Feststoff-Schüttgut in einer Flüssigkeit, wobei eine in einem Behälter befindliche Flüssigkeit zirkuliert, mit einer ersten Zufuhrleitung für das Feststoff-Schüttgut, einer zweiten Zufuhrleitung für die Flüssigkeit und mit einer Zirkulierleitung für die zirkulierende Flüssigkeit, wobei diese Leitungen in den Behälter münden, mit einer im Behälter befindlichen Austrittsdüse, der ein Prallteller zugewandt ist.The invention relates to a device for dissolving solid bulk material in a liquid, a liquid in a container circulating, having a first supply line for the solid bulk material, a second supply line for the liquid and a circulating line for the circulating liquid, wherein these lines open into the container, with an outlet nozzle located in the container, to which a baffle plate faces.

Die Vorrichtung ist insbesondere für Grossraumlöser (Grossraummischer) bestimmt, bei denen das Feststoff-Schüttgut z.B. als Zucker vorliegt, der z.B. in Wasser gelöst werden soll. Beim sogenannten Grossraumlöser erfolgt ein chargenweises Beschicken des Behälters, wobei im Behälter, abhängig von der Endkonzentration, Flüssigkeit vorgelegt wird, worauf dann der Zucker während einer bestimmten Beschickungszeit mittels Luft eingeblasen wird. Die Beschickungszeit kann sich z.B. über eine Stunde erstrecken, wobei grosse Förderluftmengen von z.B. 480 Nm³/h bis 800 Nm³/h in den Behälter eingeführt werden. Diese Förderluft muss natürlich wieder vom Behälter weggeführt werden. Dieses Verfahren bei Grossraumlösern, durch Eintauchen der Förderleitung in die Flüssigkeitsvorlage den anfallenden Zuckerstaub direkt zu binden, war bisher nicht zufriedenstellend, da die Kontaktzeit der staubhaltigen Förderluft mit der Flüssigkeit zu kurz war und ein Teil des Staubes nicht gelöst bzw. gebunden werden konnte. Deshalb musste in der Zuluftleitung oder in der Abluftleitung ein Luftabscheider und bzw. oder ein Filter vorgesehen werden. Dieser Luftabscheider und der Filter sind nachteilige Einrichtungen, denn es sind zusätzliche Einrichtungen der Vorrichtung, auf die man eigentlich gern verzichten würde, und weiterhin muss dann der im Luftabscheider und im Filter aus der Förderluft ausgeschiedene Zuckerstaub aus diesen Einrichtungen entfernt werden, was mit zusätzlichem Aufwand verbunden ist. Ausserdem ist das Entfernen des Filterkuchens vom Filter nicht einfach und nicht sehr hygienisch, da der Filterkuchen nicht trocken, sondern schmierig ist.The device is intended in particular for large-area solvents (large-scale mixers) in which the bulk solids are present, for example, as sugar, which is to be dissolved, for example, in water. In the so-called large-volume solvent, the container is charged in batches, with liquid being placed in the container, depending on the final concentration, whereupon the sugar is blown in with air during a specific loading time. The loading time can extend, for example, over an hour, with large amounts of conveying air of, for example, 480 Nm³ / h to 800 Nm³ / h being introduced into the container. This conveying air must of course be led away from the container. This method for large-area solvents, by immersing the delivery line in the liquid supply, directly binding the resulting sugar dust, has so far not been satisfactory, since the contact time of the dust-containing conveying air with the liquid was too short and part of the dust could not be dissolved or bound. For this reason, an air separator and / or a filter had to be provided in the supply air line or in the exhaust air line. This air separator and the filter are disadvantageous devices, because there are additional devices of the device that one would actually like to do without, and furthermore the in Air separators and sugar dust separated from the conveying air in the filter can be removed from these devices, which is associated with additional outlay. In addition, removing the filter cake from the filter is not easy and not very hygienic, since the filter cake is not dry, but greasy.

Es wird die Schaffung einer Vorrichtung bezweckt, bei der kein Luftabscheider und kein Filter notwendig sind und trotzdem die Förderluft staubfrei in die Atmosphäre abgegeben werden kann.The aim is to create a device in which no air separator and no filter are necessary and the conveying air can nevertheless be released into the atmosphere without dust.

Die erfindungsgemässe Vorrichtung ist dadurch gekennzeichnet, dass die erste Zufuhrleitung und die Zirkulierleitung zu einem Austrittsabschnitt zusammengeführt sind, der die Austrittsdüse trägt, so dass an der Austrittsdüse die Ströme aus der ersten Zufuhrleitung und der Zirkulierleitung austreten und auf den Prallteller treffen.The device according to the invention is characterized in that the first feed line and the circulation line are brought together to form an outlet section which carries the outlet nozzle, so that the flows from the first feed line and the circulation line emerge at the outlet nozzle and hit the baffle plate.

In der Zeichnung ist ein Ausführungsbeispiel des Erfindungsgegenstandes dargestellt. Es zeigen:

  • Figur 1 einen Grossraumlöser mit der schematischen Darstellung der erfindungsgemässen Vorrichtung im Vertikalschnitt, und
  • Figur 2 ein Detail der Figur 1 in vergrösserter Darstellung.
In the drawing, an embodiment of the subject matter of the invention is shown. Show it:
  • 1 shows a large-area solver with the schematic representation of the device according to the invention in vertical section, and
  • Figure 2 shows a detail of Figure 1 in an enlarged view.

Der in Figur 1 gezeigte Grossraumlöser hat einen Behälter 1, eine erste Zufuhrleitung 2 für das Feststoff-Schüttgut und eine zweite Zufuhrleitung 3 für eine Flüssigkeitsvorlage. Für das Beispiel sei angenommen, dass das Feststoff-Schüttgut als Zucker vorliegen soll, und dass die Flüssigkeit z.B. Wasser sein soll. Die beiden Zufuhrleitungen 2 und 3 münden in den Behälter 1. Im Behälter befindet sich eine Austrittsdüse 4, der ein Prallteller 5 zugewandt ist. Die Vorrichtung hat weiterhin eine Zirkulierleitung 6 für die zirkulierende Flüssigkeit. Diese Zirkulierleitung 6 umfasst einen Saugabschnitt 6' und einen Druckabschnitt 6''. Am Boden des Behälters 1 befindet sich noch eine Leitung 7 zum vollständigen Endleeren des Behälters. Oben am Behälter befindet sich die Abluftleitung 8. Aus dieser soll also die staubfreie Förderluft abströmen, ohne dass ein Zyklonabscheider und ein Filter notwendig sind.The large-volume solvent shown in FIG. 1 has a container 1, a first feed line 2 for the bulk solids and a second feed line 3 for a liquid supply. For the example it is assumed that the bulk solids should be present as sugar and that the liquid should be water, for example. The two supply lines 2 and 3 open into the container 1. There is an outlet nozzle 4 in the container, to which a baffle plate 5 faces. The device also has a circulation line 6 for the circulating liquid. This circulation line 6 comprises a suction section 6 'and a pressure section 6''. At the bottom of the container 1 there is still a line 7 for complete Final emptying of the container. The exhaust air line 8 is located at the top of the container. The dust-free conveying air should flow out of this, without the need for a cyclone separator and a filter.

Die Zirkulierleitung 6 weist im Innern des Behälters 1 einen L-förmigen Krümmer 9 auf und die erste Zufuhrleitung 2 mündet im Bereich des Krümmers 9 in die Zirkulierleitung 6. Die erste Zufuhrleitung 2 weist an ihrer Mündung eine erweiterte Düse 10 auf. Der Leitungsabschnitt zwischen der erweiterten Düse 10 und der als Kompressionsdüse ausgebildeten Austrittsdüse 4 soll als Austrittsabschnitt 11 der Zirkulierleitung 6 bezeichnet werden. Die Zirkulierleitung 6 mit ihrem Druckabschnitt 6'', dem Krümmer 9 und dem Austrittsabschnitt 11 bildet zusammen mit der ersten Zufuhrleitung 2 und ihrer Düse 10 eine Strahlenpumpe, die im vorliegenden Fall als Flüssigkeitsstrahl-Feststoffsauger ausgebildet ist. Wenn Zucker in Wasser gelöst werden soll, dann ist diese Strahlenpumpe ein Wasserstrahl-Zuckersauger. Durch die zirkulierende Flüssigkeit tritt dann an der Düse 10 ein geringer Unterdruck auf. An der Austrittsdüse 4 treten also die Ströme aus der ersten Zufuhrleitung 2 und der Zirkulierleitung 6 aus und treffen auf den Prallteller 5.The circulation line 6 has an L-shaped elbow 9 in the interior of the container 1 and the first feed line 2 opens into the circulation line 6 in the region of the elbow 9. The first feed line 2 has an enlarged nozzle 10 at its mouth. The line section between the expanded nozzle 10 and the outlet nozzle 4 designed as a compression nozzle is to be referred to as the outlet section 11 of the circulation line 6. The circulation line 6 with its pressure section 6 ″, the elbow 9 and the outlet section 11 forms, together with the first feed line 2 and its nozzle 10, a jet pump, which in the present case is designed as a liquid jet solid suction device. If sugar is to be dissolved in water, this jet pump is a water jet sugar sucker. A small negative pressure then occurs at the nozzle 10 due to the circulating liquid. At the outlet nozzle 4, the currents emerge from the first feed line 2 and the circulation line 6 and hit the baffle plate 5.

Beim dargestellten Ausführungsbeispiel weist die Zirkulierleitung 6 den Austrittsabschnitt 11 auf und die erste Zufuhrleitung 2 mündet in die Zirkulierleitung 6. Bei einem anderen, nicht dargestellten Ausführungsbeispiel wäre es aber auch möglich, dass die erste Zufuhrleitung 2 den Austrittsabschnitt aufweist und die Zirkulierleitung in die erste Zufuhrleitung 2 einmündet.In the illustrated embodiment, the circulation line 6 has the outlet section 11 and the first feed line 2 opens into the circulation line 6. In another embodiment, not shown, it would also be possible for the first feed line 2 to have the outlet section and the circulation line into the first feed line 2 flows into.

Im Behälter 1 wird ein Mindest-Flüssigkeitsstand 13 vorgegeben, der mit der Markierung 12 angezeigt wird.A minimum liquid level 13 is specified in the container 1 and is indicated by the marking 12.

Wie schon erwähnt, wird der Behälter 1 chargenweise mit der Flüssigkeit (Wasser) und dem FeststoffSchüttgut (Zucker) beschickt. Ist diese chargenweise Beschickung beendet, z.B. nach einer Stunde, wird das Ventil 14 geschlossen. In diesem Fall ist die Anlage ein sogenannter Grossraumlöser (Grosslöser).As already mentioned, the container 1 is loaded with the liquid (water) and the bulk solids in batches (Sugar) loaded. When this batch feed has ended, for example after an hour, the valve 14 is closed. In this case, the system is a so-called large area solver.

Der in Figur 1 dargestellte Aufbau der Anlage könnte aber auch Teil einer kontinuierlich arbeitenden Anlage sein, so dass dann der Behälter 1 üblicherweise als Suspensionsbehälter bezeichnet werden würde, und zusätzlich zu diesem Behälter 1 dann noch eine nicht dargestellte Lösekammer vorhanden wäre. Bei einer solchen Anlage erfolgt dann die Beschickung mit Wasser und Zucker nicht mehr chargenweise, sondern der Zucker und das Wasser werden kontinuierlich der Anlage zugeführt und das Endprodukt auch kontinuierlich von der Anlage weggeführt. Die erfindungsgemässe Vorrichtung ist aber in erster Linie für den erwähnten Grossraumlöser interessant, da bei diesem der Zucker mit grossen Luftmengen ins Innere des Behälters 1 gefördert wird.
   Es wird noch darauf hingewiesen, dass die Prallplatte 5 mittels einer Stange 16 über einen z.B. dreizackigen, sternförmigen Halter 17 im Austrittsabschnitt 11 gehalten wird. In der Zirkulierleitung 6 befindet sich eine Pumpe 18 sowie ein Absperrventil 19. Von der Zirkulierleitung 6 führt eine Leitung 20 weg, über die die fertige Zuckerlösung vom Behälter 1 weggeführt wird. In der Leitung 20 befindet sich ein Absperrventil 21.The structure of the system shown in FIG. 1 could also be part of a continuously operating system, so that the container 1 would then usually be referred to as a suspension container, and in addition to this container 1 there would also be a release chamber (not shown). In such a system, the water and sugar are then no longer fed in batches, but the sugar and water are continuously fed to the system and the end product is also continuously removed from the system. However, the device according to the invention is primarily of interest for the large-area solvent mentioned, since in this the sugar is conveyed into the interior of the container 1 with large amounts of air.
It is also pointed out that the baffle plate 5 is held in the outlet section 11 by means of a rod 16, for example via a three-pointed, star-shaped holder 17. A pump 18 and a shut-off valve 19 are located in the circulation line 6. A line 20 leads away from the circulation line 6, via which the finished sugar solution is led away from the container 1. A shut-off valve 21 is located in line 20.

Im folgenden wird eine Anlage mit einer bekannten Vorrichtung und eine solche mit der erfindungsgemässen Vorrichtung erläutert.A system with a known device and one with the device according to the invention is explained below.

Zuerst soll noch auf die an sich bekannte Funktion der Prallplatte 5 verwiesen werden. Der aus der Düse 4 austretende Strahl trifft im wesentlichen rechtwinklig auf den Prallteller 5, so dass dann der erwähnte Strahl (achsialer Strahl) in einen sternförmigen, divergierenden, radialen Strahl umgelenkt wird. In der Mischtechnik wird dieser Prallteller zum Erzeugen des radialen Strahles bereits verwendet, wobei die zirkulierende Flüssigkeit immer wieder auf diese Prallplatte 5 trifft. Durch diese Prallplatte wird eine besonders starke turbulente Strömung im zirkulierenden Medium erzielt. Durch die Pumpe 18 wird das zirkulierende Medium (Flüssigkeit mit darin gelösten und suspendierten Feststoffen) über den Saugabschnitt 6' angesaugt und über den Druckabschnitt 6'' wieder zur Prallplatte 5 geführt. Bei der bekannten Vorrichtung wurde das Feststoff-Schüttgut (Zucker) über eine Leitung 2' dem Behälter 1 zugeführt, wobei sich die Zirkulierleitung 6 und die Prallplatte 5 in der in Figur 1 dargestellten Lage innerhalb des Behälters 1 befanden. Bei der bekannten Vorrichtung traten die grossen Luftmengen in grossen Luftblasen aus der Mündung der Leitung 2' aus, drangen durch den grossen Auftrieb schnell an die Flüssigkeitsoberfläche und zerplatzten hier. Diese grossen Luftblasen enthalten viel Zuckerstaub, der nicht schnell in Kontakt mit der Flüssigkeit kommt und oberhalb des Flüssigkeitsspiegels 13 in den Gasraum 22 abgegeben wird, wobei dann dieser Zuckerstaub mit der Förderluft über die Leitung 8 weggeführt wird. Deshalb musste bisher in dieser Abluftleitung 8 der eingangs erwähnte Filter vorgesehen werden. Dieser erläuterte Vorgang konnte auch dadurch nicht vermieden werden, wenn man die Leitung 2' möglichst tief in die Flüssigkeit 23 eintaucht.First, reference should be made to the function of the baffle plate 5 which is known per se. The jet emerging from the nozzle 4 strikes the baffle plate 5 essentially at right angles, so that the aforementioned jet (axial jet) is then deflected into a star-shaped, diverging, radial jet. In mixing technology, this baffle plate is already used to generate the radial jet, with the circulating liquid again and again hits this baffle plate 5. A particularly strong turbulent flow in the circulating medium is achieved through this baffle plate. The circulating medium (liquid with solids dissolved and suspended in it) is sucked in by the pump 18 via the suction section 6 'and led back to the baffle plate 5 via the pressure section 6''. In the known device, the bulk solids (sugar) was fed to the container 1 via a line 2 ', the circulation line 6 and the baffle plate 5 being in the position shown in FIG. 1 inside the container 1. In the known device, the large amounts of air in large air bubbles emerged from the mouth of line 2 ', quickly reached the surface of the liquid due to the large buoyancy and burst there. These large air bubbles contain a lot of sugar dust, which does not come into contact with the liquid quickly and is released into the gas space 22 above the liquid level 13, this sugar dust then being carried away via the line 8 with the conveying air. Therefore, previously mentioned filter had to be provided in this exhaust air line 8. This explained process could also not be avoided by immersing the line 2 'as deeply as possible into the liquid 23.

Bei der erfindungsgemässen Vorrichtung wird nunmehr die Zucker-Zufuhrleitung 2 (bei geöffnetem Ventil 14) in die Zirkulierleitung 6 eingeführt. Wie bereits erwähnt, bilden die Düse 10 der Leitung 2 zusammen mit dem Austrittsabschnitt 11 eine Strahlenpumpe, wobei im Austrittsabschnitt 11 eine grosse turbulente Strömung entsteht und die zirkulierende Flüssigkeit sehr stark mit dem über die Leitung 2 zugeführten Zucker vermischt wird. Durch die grosse Turbulenz wird der Feststoff (Zucker und Zuckerstaub) intensiv und damit schnell von der Flüssigkeit gebunden. Dieses Strömungsmedium (Flüssigkeit + Feststoffe + Zuckerlösung + Luft) gelangt über die Kompressionsdüse 4, in der seine Geschwindigkeit erhöht wird, auf den Prallteller 5. Hierbei tritt wieder das vorerwähnte gute Durchmischen und intensives Binden des Feststoffes an die Flüssigkeit auf, aber zusätzlich tritt nunmehr noch ein ganz besonderer vorteilhafter Effekt ein. Die vorerwähnte grosse Luftmenge wird durch die Prallplatte 5 in viele kleine Luftblasen aufgeteilt. Diese vielen kleinen Luftblasen treten durch ihren geringeren Auftrieb langsam an die Flüssigkeitsoberfläche 13. Diese vielen kleinsten Luftbläschen können nur unbedeutend Zuckerstaub enthalten, der beim Aufsteigen in der Flüssigkeit problemlos an die Flüssigkeit gebunden werden kann, so dass die gesamte Luftmenge durch die Verteilung in kleinste Luftbläschen zuckerstaubfrei in den Gasraum 22 eintritt und deshalb auch eine zuckerstaubfreie Förderluft über die Leitung 8 abgeführt werden kann. Der Vorteil liegt also sowohl in der Aufteilung der grossen Luftmenge in unzählige kleinste Luftbläschen, die nur unbedeutend Zuckerstaub enthalten können, als auch in der durch die kleinsten Bläschen erzielten vergrösserten Kontaktzeit beim langsameren Aufsteigen der kleinsten Luftbläschen, so dass durch diese zwei Wirkungen eine zuckerstaubfreie Abführung der Förderluft aus dem Behälter 1 erreicht wird.In the device according to the invention, the sugar supply line 2 (with the valve 14 open) is now introduced into the circulation line 6. As already mentioned, the nozzle 10 of the line 2, together with the outlet section 11, forms a jet pump, a large turbulent flow occurring in the outlet section 11 and the circulating liquid being very strongly mixed with the sugar supplied via the line 2. Due to the great turbulence, the solid (sugar and sugar dust) is intensely and thus quickly bound by the liquid. This flow medium (liquid + solids + sugar solution + air) passes through the compression nozzle 4, in which its speed increases on the baffle plate 5. Here again the aforementioned thorough mixing and intensive binding of the solid to the liquid occurs, but in addition a very special advantageous effect now occurs. The aforementioned large amount of air is divided into many small air bubbles by the baffle plate 5. These many small air bubbles slowly come to the liquid surface 13 due to their lower buoyancy. These many small air bubbles can only contain insignificant sugar dust, which can easily be bound to the liquid when rising in the liquid, so that the total amount of air is distributed through the smallest air bubbles sugar-free enters the gas space 22 and therefore a sugar-free conveying air can also be discharged via the line 8. The advantage therefore lies both in the division of the large amount of air into innumerable smallest air bubbles, which can only contain insignificant sugar dust, and in the increased contact time achieved by the smallest air bubbles when the smallest air bubbles rise slowly, so that these two effects ensure sugar-free removal the conveying air from the container 1 is reached.

Bei der Arbeitsweise mit der erfindungsgemässen Vorrichtung wird folgendermassen vorgegangen. Zuerst wird bei geöffnetem Ventil 15 über die Leitung 3 eine Charge an bestimmter Flüssigkeitsmenge dem Behälter 1 zugeführt (z.B. 1/3 der Höhe des Behälters). Dann wird das Ventil 15 geschlossen. Das Ventil 21 war bereits vor dem Füllvorgang geschlossen. Nunmehr wird die Pumpe 18 eingeschaltet, das Ventil 19 geöffnet und eine vorgegebene Zuckermenge z.B. ab einem Lastwagen bei geöffnetem Ventil 14 über die Leitung 2 dem Behälter 1 zugeführt, wobei die erwähnte grosse Luftmenge mit einer Geschwindigkeit z.B. im Bereich von 15-20 m/s während z.B. einer Stunde den Zucker in die Flüssigkeit einführt. Die Flüssigkeit 23 wird in der erläuterten Weise über die Zirkulierleitung 6 umgewälzt (zirkuliert). Durch die Ausbildung des Mündungsende der Leitung 2 mit seiner Düse 10 und dem die Düse 10 umgebenden Austrittsabschnitt 11 als Strahlpumpe (Strahlapparat) wird am Mündungsende der Leitung 2 ein Unterdruck erzeugt, so dass verhindert wird, dass die zirkulierende Flüssigkeit in die Leitung 2 eindringt, so dass also keine Flüssigkeit zum Lastwagen gefördert wird, von dem der Zucker entnommen wird. Während der erläuterten Zirkulation in der Leitung 6 werden in der beschriebenen Weise, durch die Prallplatte 5 die vielen kleinen Luftbläschen erzeugt, so dass die gesamte Luftmenge durch eine wesentlich erhöhte Kontaktfläche und während einer wesentlich längeren Kontaktzeit mit der Flüssigkeit in Kontakt kommt.The procedure for working with the device according to the invention is as follows. First, with the valve 15 open, a batch of a certain amount of liquid is fed to the container 1 via the line 3 (for example 1/3 of the height of the container). Then the valve 15 is closed. The valve 21 was already closed before the filling process. Now the pump 18 is switched on, the valve 19 is opened and a predetermined amount of sugar is supplied to the container 1 via the line 2, for example from a truck with the valve 14 open, the aforementioned large amount of air at a speed, for example in the range of 15-20 m / s while, for example, introduces the sugar into the liquid for one hour. The liquid 23 is explained in FIG Circulated (circulated) way over the circulation line 6. By forming the mouth end of the line 2 with its nozzle 10 and the outlet section 11 surrounding the nozzle 10 as a jet pump (jet apparatus), a negative pressure is generated at the mouth end of the line 2, so that the circulating liquid is prevented from entering the line 2, so that no liquid is conveyed to the truck from which the sugar is removed. During the described circulation in the line 6, the many small air bubbles are generated in the manner described by the baffle plate 5, so that the entire amount of air comes into contact with the liquid through a substantially increased contact area and during a considerably longer contact time.

Ist die Beschickung des Behälters 1 mit dem Zucker abgeschlossen, wird noch während einer geringen Zeit, z.B. eine 1/4 Stunde, das Strömungsmedium in der Zirkulierleitung 6 umgewälzt, bis nur noch Zuckerlösung vorhanden ist, die dann über die Leitung 20 weggeführt wird.When the loading of the container 1 with the sugar has been completed, a short time, e.g. a 1/4 hour, the flow medium circulated in the circulation line 6 until only sugar solution is available, which is then carried away via line 20.

Claims (9)

  1. Apparatus for dissolving solid bunk material in a liquid, whereby a liquid located in a container (1) circulates, with a first feed line (2) for the solid bunk material, a second feed line (3) for the liquid and with a circulation line (6) for the circulating liquid (23), whereby these lines (2,3,6) open into the container (1), with an exit nozzle (4) located in the container (1) which is faced by a baffledisc (5), characterized in that the first feed line (2) and the circulation line (6) are led together to an exit section (11) which supports the exit nozzle, such that the flows from the first feed line (2) and the circulation line (6) exit at the exit nozzle (4) and impinge on the baffledisc (5).
  2. Apparatus according to claim 1, whereby the circulation line (6) includes the exit section (11), characterized in that the first feed line (2) opens into the circulation line (6) (Fig. 1,2).
  3. Apparatus according to claim 1, characterized in that the first feed line (2) includes the exit section (11).
  4. Apparatus according to claim 1, 2 or 3, whereby the circulation line (6) comprises within the container (1) a L-shaped elbow (9), characterized in that the first feed line (2) opens into the circulation line (6) at the area of the elbow (9).
  5. Apparatus according to one of the claims 1-4, characterized in that the exit nozzle (4) is designed as compression nozzle.
  6. Apparatus according to one of the claims 1-5, characterized in that the leading together of the first feed line (2) and the circulation line (6) in the exit section (11) proceeds by means of a liquid ejector which aspirates simultaneously solid materials and air.
  7. Method of operating the apparatus of claim 1, characterizing in that the container (1) is charged batch-wise with the liquid and the solid bunk material.
  8. Method of operating the apparatus of claim 1, characterized in that the container (1) is charged continuously with the liquid and the solid bunk material.
  9. Method according to claim 7, characterized in that the solid bunk material is fed by air through the first feed line (2) into the container (1).
EP91119336A 1990-11-19 1991-11-13 Apparatus for dissolving solid bulk material in a liquid Expired - Lifetime EP0486933B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3666/90A CH682460A5 (en) 1990-11-19 1990-11-19 Apparatus for dissolving solid bulk material in a liquid.
CH3666/90 1990-11-19

Publications (3)

Publication Number Publication Date
EP0486933A2 EP0486933A2 (en) 1992-05-27
EP0486933A3 EP0486933A3 (en) 1992-06-03
EP0486933B1 true EP0486933B1 (en) 1995-03-15

Family

ID=4260899

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91119336A Expired - Lifetime EP0486933B1 (en) 1990-11-19 1991-11-13 Apparatus for dissolving solid bulk material in a liquid

Country Status (4)

Country Link
EP (1) EP0486933B1 (en)
AT (1) ATE119804T1 (en)
CH (1) CH682460A5 (en)
DE (1) DE59104957D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017050639A1 (en) 2015-09-24 2017-03-30 Tetra Laval Holdings & Finance S.A. Baffle pipe segment, injector device and dissolving installation

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69628730T2 (en) * 1996-04-01 2003-12-11 Societe Des Produits Nestle S.A., Vevey Method and device for dissolving powder in a liquid
DE102008012725A1 (en) * 2008-03-05 2009-09-24 United Waters International Ag Apparatus for fumigation of liquids

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR555142A (en) * 1922-08-16 1923-06-25 Apparatus for ensuring intimate contact between a dissolving liquid and a pulverized solid
DE2925191C2 (en) * 1979-06-22 1982-11-11 BURDOSA Ing. Herwig Burgert, 6305 Buseck Loop reactor
DE3341992A1 (en) * 1983-11-22 1985-05-30 Georg Dipl.-Ing. 5000 Köln Schreiber Multiple stage column
SU1368012A1 (en) * 1986-07-02 1988-01-23 Предприятие П/Я А-3852 Apparatus for solving powder materials in liquid
GB8617660D0 (en) * 1986-07-18 1986-08-28 Healplan Ltd Dry powder doser
GB8915978D0 (en) * 1989-07-12 1989-08-31 Mcdermott Matthew Apparatus for dissolving solids in liquids

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017050639A1 (en) 2015-09-24 2017-03-30 Tetra Laval Holdings & Finance S.A. Baffle pipe segment, injector device and dissolving installation

Also Published As

Publication number Publication date
EP0486933A3 (en) 1992-06-03
DE59104957D1 (en) 1995-04-20
CH682460A5 (en) 1993-09-30
EP0486933A2 (en) 1992-05-27
ATE119804T1 (en) 1995-04-15

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