EP0170263A2 - Mélangeur pour liquides visqueux - Google Patents

Mélangeur pour liquides visqueux Download PDF

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Publication number
EP0170263A2
EP0170263A2 EP85109587A EP85109587A EP0170263A2 EP 0170263 A2 EP0170263 A2 EP 0170263A2 EP 85109587 A EP85109587 A EP 85109587A EP 85109587 A EP85109587 A EP 85109587A EP 0170263 A2 EP0170263 A2 EP 0170263A2
Authority
EP
European Patent Office
Prior art keywords
container
mixer according
valve
sealed
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.)
Withdrawn
Application number
EP85109587A
Other languages
German (de)
English (en)
Other versions
EP0170263A3 (fr
Inventor
Józef Dobrodziej
Witold Lekawski
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.)
Predsiebiorstwo Projektowania i Dostaw Kompletnych Obiektow Przemyslowych "Chemadex"
Original Assignee
Predsiebiorstwo Projektowania i Dostaw Kompletnych Obiektow Przemyslowych "Chemadex"
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 PL24902084A external-priority patent/PL141683B1/pl
Priority claimed from PL25303685A external-priority patent/PL144728B3/pl
Application filed by Predsiebiorstwo Projektowania i Dostaw Kompletnych Obiektow Przemyslowych "Chemadex" filed Critical Predsiebiorstwo Projektowania i Dostaw Kompletnych Obiektow Przemyslowych "Chemadex"
Publication of EP0170263A2 publication Critical patent/EP0170263A2/fr
Publication of EP0170263A3 publication Critical patent/EP0170263A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/0058—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for only one medium being tubes having different orientations to each other or crossing the conduit for the other heat exchange medium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F31/00—Mixers with shaking, oscillating, or vibrating mechanisms
    • B01F31/65—Mixers with shaking, oscillating, or vibrating mechanisms the materials to be mixed being directly submitted to a pulsating movement, e.g. by means of an oscillating piston or air column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0052—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for mixers

Definitions

  • the invention relates to a mixer for mixing viscous liquids, in particular for mixing the filler III in sugar production.
  • Known mixers of this type consist of vertically arranged roll containers with a vertical, central shaft on which horizontal, radial mixing elements are attached. Flat, horizontal coils serve between the mixing elements, which guide the coolant to cool the contents of the container. The filling compound is fed to the upper part of the container and removed from its lower part.
  • the filling compound is not moved with sufficient intensity relative to the cooling elements and the available heat exchange surface is relatively small, so that the cooling rate is low.
  • the residence time of the filling compound in the mixer is extended, and large-volume mixing containers must be used in which the heat exchange is further deteriorated. It is therefore necessary to connect several mixers in series-connected batteries, between which the filling compound has to be transported by means of pumps.
  • the crystallization possibilities of the mixers are limited with regard to the dilution of the filling mass to a density at which the pumps have to work.
  • the molasses contained in the filling compound can therefore not be used efficiently.
  • the pumps also increase energy consumption.
  • Mixers with vertically positioned containers are also known, which additionally have cooling elements with mixing elements, larger torques being supplied to the shafts of these mixing elements in order to increase the mixing intensity.
  • These improvements do not fundamentally eliminate the disadvantages of the mixers described above, but rather buy them with drives with several times higher power and higher torque, which causes an even higher energy consumption.
  • the shafts and mixing elements have a complicated structure, since they are characterized by a much higher strength and moreover have to contain supply and discharge elements for the cooling liquid.
  • mixers in the form of vertical containers with vertical shafts are known, on which a mixing element or the mixing elements in the form of a rotary piston are attached, which perform oscillating rotary movements about the axis.
  • the rotary piston performs part of a full revolution from one end position to the other end position, where it is reversed in the opposite direction until it reaches the first end position. The cycle of piston movement is then repeated.
  • Cooling elements in the form of vertical tubes through which the cooling liquid flows are accommodated in the spaces of the container which are not covered by the piston movement.
  • the back-and-forth movement of the pistons causes a relatively intensive movement of the filling compound relative to the cooling elements and enables relatively high rates of heat exchange.
  • the large movement resistances opposed to the rotary piston not only require drives with high power and corresponding energy consumption, but also cause a complication of the construction of the piston, since it has to transmit large forces caused by the resistances of the filling material circulation via the cooling elements.
  • the arrangement of the cooling elements and the system of the coolant distribution to the individual cooling elements in mixers of this type are very complicated.
  • the invention has for its object to provide a mixer for mixing viscous liquids, in particular for mixing the filler III in sugar production, in which a high mixing intensity of the content can be achieved compared to the cooling elements.
  • the material to be mixed should be mixed so that the size of the mixer is not limited.
  • the mixer should be simple; the volume of the mixer should not be limited in order to avoid the use of mixer batteries.
  • the mixer according to the invention contains at least two containers, preferably vertical, cylindrical or cylindrical containers, which are set up next to one another and are connected in the lower part by a connecting line with a corresponding diameter in such a way that they form a system of communicating tubes. At least one container is connected to the atmosphere in the upper part and at least one container is tightly sealed at the top. According to the invention, the container or containers, which are sealed off at the top, are connected in the upper part via a line and a valve to a pressurized gas or steam source.
  • the upper part of the container closed at the top can also be connected to a vacuum source, which according to the invention can consist of a barometric condenser, the vacuum pipelines of the filling mass cooking appliances or vacuum pumps.
  • a vacuum source which according to the invention can consist of a barometric condenser, the vacuum pipelines of the filling mass cooking appliances or vacuum pumps.
  • the cooling elements are arranged one above the other in the form of preferably flat tubular elements in horizontal layers.
  • the one or more tightly sealed containers are preferably provided with a heating jacket through which the heat transfer medium is guided.
  • the interior of these containers is provided with horizontally arranged, immovable mixing elements, for example in the form of horizontally arranged metal angles.
  • valve in the supply line which supplies the gas or the gas to the closed container at the top under pressure or vacuum.
  • This valve is at least a two-way valve, which alternately connects the inside of the container with the pressure or with the vacuum source in the one layer and with the atmosphere or a container in the second layer, in which there is a pressure which is different from the pressure supplied or Vacuum is different.
  • This valve is connected to a level controller, which controls its position depending on the liquid level in the container.
  • the mixer for mixing viscous liquids in particular for mixing and crystallizing the filling mass III in sugar production, consists of a container 1, which is open to the atmosphere via a chimney 2, and a container 3 closed in the upper part.
  • the containers 1 and 3 have preferably cylindrical shape and are preferably placed vertically next to each other.
  • a centrally and vertically arranged rotary shaft 4 which is driven by a motor 5.
  • Radial mixing elements 6 are attached to the shaft 4.
  • immovable cooling tube elements 7 are arranged in the interior of the container 1, through which the cooling water supplied by means of a nozzle 8 and discharged by means of a nozzle 9 flows.
  • the Layers of the cooling elements 7 are connected to one another in rows in two groups.
  • a nozzle 10 is used to feed the filling compound into the mixer, with troughs 11 provided with openings under the inlet of the nozzle 10 into the container 1 in the bottom. Over the trays 11 is housed an apertured pipe 12 which is connected to dilute the filling material having a W asserzu- or drain facilities.
  • the lower part of the sealed container 3 is connected to the container 1 in its lower part by means of a connecting line 13.
  • the container 3 is enclosed by a heating jacket 14, in the interior of which the heating liquid is supplied via a nozzle 17.
  • a nozzle 16 is used to discharge the heating fluid from the interior of the heating jacket 14.
  • the inside of the container 3 is connected by means of a nozzle 15 to a line for removing the filling compound from the mixer for further processing in centrifuges.
  • the upper part of the container 3 is connected by means of a line 18 and a two-way valve 19 to a line 20 which is connected to a pressure or vacuum source, i.e. to a pressurized steam or gas source or to a vacuum pump station or steam condensers.
  • a pressure or vacuum source i.e. to a pressurized steam or gas source or to a vacuum pump station or steam condensers.
  • a liquid level sensor which is connected to a controller 23 controlling a three-way two-position valve 19, is mounted inside the container 3 sealed at the top. Additional plate heating elements 21 and mixing elements 22 are also fastened in the interior of the container 3. They have the shape of immovable metal angles, which are connected to the walls of the container 3.
  • the plate heating elements 21 accommodated in the interior of the container 3 are connected to the circulation of the heating medium which is supplied to the heating jacket 14 of the container 3.
  • the diluted filling compound flows out of the troughs 11 through the openings in the bottoms thereof into the interior of the container 1 and fills both this container and the container 3 connected to it at the top.
  • the three-way Valve 19 is brought into a position in which line 18 is connected via line 20 to a compressed gas source (1.2 atm) so that the gas flows to the upper part of container 3. Since the container 3 is sealed off at the top, the pressurized gas presses on the surface of the container 3 filled with filling compound and moves it via the connecting line 13 into the container 1. This increases the filling compound level in the container 1. This movement is unimpeded because the upper part the container 1 is connected to the atmosphere via the chimney 2.
  • the filling compound is lowered in the container 3 to a filling level which is somewhat higher than the outlet connection 15 for the filling compound, which is registered by the filling level sensor in the container 3.
  • the automatic controller 23 connected to this sensor switches the three-way two-position valve 19 into a position in which the Line 18 and thus also the upper part of the container 3 is connected to the atmosphere. As a result, the pressure in the upper part of the container 3 drops to atmospheric pressure.
  • valve 19 fills the upper part of the container 3 as a result of the level differences of the filling mass in the containers 1 and 3 forming the communicating tubes until the highest level in the container 3 is reached. Reaching the highest level of the filling mass in the container 3 is registered by the level sensor connected to the controller 23. The controller 23 then switches the three-way valve 19 into the position in which the line 18 and thus the upper part of the container 3 are connected via line 20 to the compressed gas source; the above process is repeated.
  • the filling compound filling the containers 1 and 3 is in an intensive pulsation movement with respect to the cooling elements 7, as a result of which the heat exchange and rapid cooling of the filling compound are promoted.
  • the uniformity of the temperature of the filling compound in the horizontal cross section of the container 1 is ensured by the arrangement according to the invention, namely by the vertical shaft 4 driven by the motor 5 and the radial mixing elements 6 fastened on the shaft 4.
  • the heating elements have an additional mixing effect on the heated filling compound immovable mixing elements 22 which are fixed in the upper part of the container 3.
  • the filling compound is cooled during the continuous flow through the container 1 by heat being given off to the cooling medium which is supplied through the nozzle 8, flows through the cooling elements 7 and is discharged via the nozzle 9.
  • the filling compound is repeatedly heated as a result of contact with the heating jacket 14 and the plate heating elements 21 through which the heating medium flows.
  • the heating medium is supplied in accordance with the requirements for the crystallization of the filling compound III in the mixer by means of the connector 17 and removed by means of the connector 16.
  • the mixer according to the invention can be designed with large dimensions, since intensive movements of the fill mass compared to the cooling and heating elements of the mixer can be achieved without the need to use mechanical elements for which great power is required to drive them.
  • the intensive movement of the filler mass compared to the cooling elements allows high heat exchange rates, which shortens the time the filler remains in the mixer.
  • the enumerated factors enable the construction of individual mixers of the type according to the invention without these having to be connected to one another. Pump systems and battery arrangements can therefore be dispensed with.
  • the mixer according to the invention can also work if the line 20 is connected to a vacuum source, for example the vacuum pump station of a sugar factory.
  • a vacuum source for example the vacuum pump station of a sugar factory.
  • the effect of the mixer according to the invention is then similar, only with the difference that after filling the containers 1 and 3 with the filling compound, the two-position valve 19 is set in a position in which the upper part of the container 3 is connected to the vacuum source.
  • the pressure in the upper part of the container 3 is reduced to a value which is substantially lower than atmospheric pressure, for example to 0.2 ata, as a result of which the filling compound passes through the connecting line 13 from the container 1, where the filling compound is under atmospheric pressure, to the inside the container 3 is promoted.
  • the level sensor in the container 3 responds, whereupon the controller 23 reverses the two-position valve 19 into a position in which the interior of the container 3 is connected to the atmosphere.
  • the balancing of the pressures acting on the filling compound in the containers 1 and 3 causes, according to the principle of the communicating tubes, that the filling compound flows out of the container 3 back into the container 1.
  • the cycle is then repeated; it causes an intensive movement of the filling material in relation to the cooling and heating elements of the mixer in the manner described.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Accessories For Mixers (AREA)
EP85109587A 1984-07-31 1985-07-30 Mélangeur pour liquides visqueux Withdrawn EP0170263A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
PL24902084A PL141683B1 (en) 1984-07-31 1984-07-31 Apparatus for mixing thick liquids in particular for use in sugar-houses to agitate the last massecuite
PL249020 1984-07-31
PL25303685A PL144728B3 (en) 1985-04-22 1985-04-22 Apparatus for agitation of thick liquids in particular third massecuite
PL253036 1985-04-22

Publications (2)

Publication Number Publication Date
EP0170263A2 true EP0170263A2 (fr) 1986-02-05
EP0170263A3 EP0170263A3 (fr) 1987-07-29

Family

ID=26653006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85109587A Withdrawn EP0170263A3 (fr) 1984-07-31 1985-07-30 Mélangeur pour liquides visqueux

Country Status (1)

Country Link
EP (1) EP0170263A3 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1255968A (fr) * 1960-01-22 1961-03-17 Lesaffre Freres Sarl Perfectionnements aux installations de malaxage de masses cuites dans l'industrie sucrière
DE1234679B (de) * 1962-10-27 1967-02-23 Knapsack Ag Steuerung einer Pulsationskolonne
US3450389A (en) * 1967-08-08 1969-06-17 Hercules Inc Mixing apparatus and method
DK138672B (da) * 1976-09-28 1978-10-16 Danske Sukkerfab Krystallisationsapparat.

Also Published As

Publication number Publication date
EP0170263A3 (fr) 1987-07-29

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