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WO1996023580A1 - Procede et appareil pour doser et melanger des substances liquides - Google Patents

Procede et appareil pour doser et melanger des substances liquides Download PDF

Info

Publication number
WO1996023580A1
WO1996023580A1 PCT/FI1996/000068 FI9600068W WO9623580A1 WO 1996023580 A1 WO1996023580 A1 WO 1996023580A1 FI 9600068 W FI9600068 W FI 9600068W WO 9623580 A1 WO9623580 A1 WO 9623580A1
Authority
WO
WIPO (PCT)
Prior art keywords
substance
circulation line
pressure difference
line
mixing
Prior art date
Application number
PCT/FI1996/000068
Other languages
English (en)
Inventor
Risto Sandstedt
Original Assignee
Ruutteri Oy
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 Ruutteri Oy filed Critical Ruutteri Oy
Priority to AU45424/96A priority Critical patent/AU4542496A/en
Publication of WO1996023580A1 publication Critical patent/WO1996023580A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/72—Measuring, controlling or regulating
    • 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
    • B01F23/50—Mixing liquids with solids
    • B01F23/56—Mixing liquids with solids by introducing solids in liquids, e.g. dispersing or dissolving
    • 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
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/83—Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices
    • 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
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/83—Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices
    • B01F35/834—Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices the flow of substances to be mixed circulating in a closed circuit, e.g. from a container through valve, driving means, metering means or dispensing means, e.g. 3-way valve, and back to the container
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D11/00—Control of flow ratio
    • G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
    • G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
    • G05D11/131—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring the values related to the quantity of the individual components
    • G05D11/132—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring the values related to the quantity of the individual components by controlling the flow of the individual components

Definitions

  • the present invention relates to a method according to the preamble of claim 1 for dosing and mixing viscous substan ⁇ ces accurately and at a desired proportion.
  • the invention further relates to an apparatus for the ap- plication of the invention.
  • the de- vices used for measuring the volume and mass flows consti ⁇ tute the most expensive parts of the system.
  • meters based, among other things, on the pressure difference caused by the the throttle or on the centrifugal force of the flow turbine meters and deplace- ment meters are used.
  • Such a system is expensive and comp ⁇ licated and requires accurate design and careful use in or ⁇ der to operate with a reasonable accuracy and reliability.
  • the devices used for measuring the volume flow operate accurately only within a certain viscosity range, wherefore only those products the viscosity of which is within the narrow operating range of the apparatus can be treated reliably with them. This is a severe drawback when handling liquids the viscosity of which changes strongly with e.g. arying temperature or dry substance content.
  • the object of the present invention is to provide a method by means of which substances and mixtures of high viscosity can be dosed with accuracy.
  • the object of the best mode of the invention is to provide a method by means of which it is possible to produce a mix ⁇ ture of a plurality of highly viscous substances, with ac ⁇ curately determined proportions of the different substan- ces.
  • a mixture produced in a mixing container is recirculated by means of a constant volume pump within a recirculation pi- ping including a pressure difference valve for setting the pressure of the piping, and a mixture output connection is provided upstream of the valve.
  • the apparatus of the invention is characterized by what is presented in the characterizing clause of claim 6.
  • the control method is simple and there is little need for working devi ⁇ ces and meters, wherefore the system is reliable even in case the number of lines is great.
  • the mixing temperatures of the different partial mixtures can be controlled to desired values. Intermixing of the partial mixtures before the final mixing is preven- ted, in spite of the fact that the flow pipings may, be in direct contact to each other. The mixtures flow con- tiunuously in the pipings, whereby no blockings occur and at the same time the mixtures move within the storage con ⁇ tainers as well, wherefore the need for mixing within the container is smaller.
  • the system can quickly and simply be calibrated for a new mixture, and thus the apparatus of the invention is useful within a con siderably large range of viscosity, contrary to previously known systems.
  • One piping can be provided with a plurality of mixture outputs, as long as care is taken that the out ⁇ put of the constant volume pump is enough to maintain a pressure of required magnitude within the piping in spite of several outputs being in use. Alternatively, it is, by programming, possible to prevent simultaneous opening of too many outputs.
  • the benefit of the invention is to be seen therein, that the piping forms an expansion system, because the recirculation circuit and the pressure difference valve are open, wherefore heat ex ⁇ pansion of the liquid does not influence the function.
  • the distance between the mixing point and the storage and mi ⁇ xing container can be long in case of reasonable mass flows, wherefore line costs are lower than earlier.
  • the invention enables production of paints and other cor ⁇ responding products of a large industrial plant or of a large construction site, and the transportation of the pro ducts to the respective locations of use.
  • the mixers, con ⁇ tainers, and pumps as well as the control apparatus needed in the system can be collected in transportable containers whereby they are easy to transport and the system is rea- dily installable for operation.
  • Figure l illustrates a mixing apparatus usable in connecti on with the invention.
  • Figure 2 is a schematic illustration of one embodiment of the invention.
  • FIG. 3 is a schematic illustration of another embodiment of the invention.
  • the apparatus shown in Figure 1 is, except for the features relating to the present invention, presented in the Finnish Patent Application No. 940882.
  • the main parts of the appa- ratus are a mixing container 1 with a side mixer 3 in its lower portion.
  • the container 1 is supported by weight sen ⁇ sors 2.
  • To the container 1 is connected a mixing means 4 by a feed line 15 entering the upper portion of the con ⁇ tainer, and a return line 16 starts from the bottom portion of the container back to the mixing means 4.
  • a powder feed device 5 connected to a large sack 14 connected via a weight sensor 2 to a lifting device 6 and a powder suck line 17 for sucking powder from small sacks 18.
  • the weight sensors 2 of the large sack 14 are used when there is a need for emptying dosage of the sack.
  • the lower portion of the container 1 comprises heating resistances or coils 10 and at its bottom there is for the final product a discharge line 19 running through a filter 8 and a pump 7 to, e.g., a packing appara- tus, or as in the present case, to a recirculation line 21.
  • the upper portion of the container 1 comprises a liquid feed piping 9 with accessories, for feeding liquids into the container 1.
  • the apparatus further comprises a control center with weighing and control units 11, 12 and stairs and service platforms 13 and necessary washing connections.
  • the mixing means 4 is in this embodiment the mixer disclo ⁇ sed in the International Patent Application WO 92/21436.
  • This mixer comprises a mixing chamber with a liquid feed connection and a connection for feeding substances to be mixed, respectively.
  • a rotor rotated by means of an electric motor.
  • the powder- like substances are fed to a location at the center axis o the rotor and the rotor brings the liquid in the mixing chamber into rotation at a high speed, whereat a vacuum is established at the feed point.
  • the powder is quickly and i uniform distribution sucked into the liquid and the mixture is quickly transferred to the outer periphery of the rotor and out through a discharge connection in the side of the mixing chamber.
  • Mixing is fast and effective in this devi ⁇ ce, because the liquid and the powder collide with each other quickly and the mixing speed in the mixing chamber is very high.
  • the exemplifying apparatus shown in the figure works in the following way.
  • the basic raw material of the mixture e.g., water, a suitable solvent or some other liquid.
  • the mixing device 4 is star ⁇ ted and liquid is fed therein from the container 1 through the return line. Thereafter powder can be mixed into the liquid, from the large sack 14 or, by means of the sucking line 17, from the small sacks 18.
  • the powders mix into the liquid in the mixing device 4 wherefrom the mixture is transported along the feed line 15 back to the container 1.
  • the liquid fed into the container 1 circulates continuously through the mixing device 4 where different additives are introduced until all additives have been mixed into the basic raw material.
  • the mixture in the container can be mixed by means of the side mixer 3 in order to keep it flowing and " , if necessary, the mixture is heated by means of the heater 10.
  • the additives have been mixed in, basic raw material is added into the con ⁇ tainer until the correct mixture proportion and amount of the product is obtained.
  • the temperature of the final product is regulated to the one desired for packing.
  • the completed final product can be disharged from the container for instant use, or can be packed for delive ⁇ ry to customers.
  • the present invention relates to the further distribution of the mixed substance to sites of use, or to the mixing of several pumpable mixtures into a final product ready for use or for packing.
  • FIG 2 is shown a detail of a sys- tern where the intermediate products circulate in circulati ⁇ on lines 21 starting from the mixing system.
  • the system has four lines and at the operation point shown in Figure 2, each line has a branching closed by a shut-off valve 27.
  • the branchings are connected to a mixer valve 28.
  • a mixture prepared by means of the mixing device or some other re ⁇ quired constituent is fed into each line by means of the constant volume pump 7.
  • the pressure in the line is cont ⁇ rolled by means of a pressure difference valve 26 arranged after the branchings to such a magnitude that a considera- bly lower pressure is sufficient for feeding a partial mix ⁇ ture through the branching out of the line.
  • the volume flow in each line is determined according to the desired mixture proportion of the final product in such a way that the pro ⁇ portion of the volume flows of the lines corresponds to the mixture proportion of the final product.
  • the control is carried out by changing the frequency of the drive motor of the constant volume pump 7 and at the same time care is taken, by controlling the pressure difference valve or by automatics, that the pressure in the line sets to the one desired.
  • the shut-off valves 27 can be opened, whereat the pressure difference valves 26 close or remain in their respective desired control positions and the par ⁇ tial mixtures flow to the mixer valve 28. Now a desired amount of the final product can be taken from the mixer valve 28.
  • each line 21 further comprises back valves 31 in order to ensure the flow direction.
  • the volume flow circulating in the circulation line 21 is determined according to the revolution number of the cons ⁇ tant volume pump 7.
  • the revolution number is preferably controlled by means of an electric motor controlled by a frequency transducer.
  • the revo lution number and the setting of the pressure difference valve can be determined in such a way that the volume flow and the pressure in the line are set to desired values.
  • One preferable calibration unit is shown in connection wit the mixing apparatus of Figure l. It has, separate from th mixing container 1, a calibration container 24 to which, from the constant volume pump 7, leads a line closable by means of a shut-off valve 22. In the line, between the shut-off valve 22 and the calibration container 24, posi ⁇ tioned a constant pressure difference valve 23.
  • the cali ⁇ bration container 24, separated from the weighing system o the mixing container 1, is positioned above the mixing con ⁇ tainer and therefrom a line 25 closed by a shut-off valve leads to the mixing container l.
  • the shut-off valve 22 is opened whereat pumpable mixture flows into the calibration container 24 through the constant pressure difference valve 23.
  • the mixture is pumped into the calibration container 24 for a predermined period of time, or the drive motor of the pump 7 is fed at a predetermined frequency, whereat the amount pumped over the constant pressure difference at a certain revolution number is obtained.
  • the amount is easily obtained, by means of the weighing system of the mixing container, as the mass flow discharged from the container, or, alternatively, the calibration container 24 can be weighed. After calibration the calibration container 24 is emptied through the line 25 into the mixing container 1.
  • circulation lines are not used, but to the operation point is arranged ,from four constant volume pumps 7, a feed line 21 wherefrom return lines 29 lead through pressure difference valves 26 back to the mi ⁇ xing container.
  • the feed lines 21 are connected to a static mixer 30 and a valve 28 is positioned in the line leading out of the mixer 30.
  • a static mixer is most preferably used a plate mixer with half the plates being heatable and half being coolable, thereby enabling the temperature and the energy content of the final product to be set as desi ⁇ red.
  • the pre ⁇ sent invention includes other embodiments as well.
  • the pre ⁇ sent method is suitable for all such substances that are to be circulated in a distribution pipe assembly or piping in order to avoid stiffening and blocking.
  • the form of the net can be freely designed and, for example, the same container can be provided with a plurality of output lines.
  • the number of outputs need not be restricted.
  • the function of the pressu ⁇ re difference valve can be controlled automatically.
  • the pressure difference valve When mixture is taken out of the line, the pressure difference valve may close fully or partly according to how one wishes to control the system and how large a volume flow is desi ⁇ rable to circulate in the line.
  • the method can be applied as a part of any mixing system and the dosable mixture can, in addition to a storage or mixing container, be taken from another source as well, e.g., from a production line or some other source.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Accessories For Mixers (AREA)

Abstract

Procédé pour doser et mélanger des substances visqueuses avec précision et selon les quantités relatives voulues. On peut préparer la substance à doser, par exemple, par mélange d'une substance solide avec un liquide dans un récipient de mélange ou au moyen de tout autre appareil mélangeur. La substance mélangée est ensuite transférée par une pompe en vue de son conditionnement ou d'un usage ailleurs. Le mélange préparé dans le récipient de mélange est mis en circulation par une pompe à volume constant (7) dans une canalisation de circulation (21, 29) pourvue d'une vanne à différence de pression (26) servant à régler la pression de la canalisation (21, 29), et un raccord de sortie (30, 28) est monté dans la canalisation (21, 29) en amont de la vanne à différence de pression (26), dans le sens de l'écoulement du mélange.
PCT/FI1996/000068 1995-02-03 1996-02-05 Procede et appareil pour doser et melanger des substances liquides WO1996023580A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU45424/96A AU4542496A (en) 1995-02-03 1996-02-05 Method and apparatus for dosing and mixing liquid substances

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI950499A FI103500B1 (fi) 1995-02-03 1995-02-03 Menetelmä ja laitteisto nestemäisten aineiden annostelemiseksi ja sekoittamiseksi
FI950499 1995-02-03

Publications (1)

Publication Number Publication Date
WO1996023580A1 true WO1996023580A1 (fr) 1996-08-08

Family

ID=8542750

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1996/000068 WO1996023580A1 (fr) 1995-02-03 1996-02-05 Procede et appareil pour doser et melanger des substances liquides

Country Status (3)

Country Link
AU (1) AU4542496A (fr)
FI (1) FI103500B1 (fr)
WO (1) WO1996023580A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006109149A1 (fr) * 2005-04-13 2006-10-19 Be.T.A. Strumentazione S.R.L. Procede d'etalonnage pour un appareil destine a la dilution d'un fluide
WO2014078883A3 (fr) * 2012-11-21 2014-12-31 Waizenauer Dietmar Installation de mélange pour milieux visqueux
WO2015099625A1 (fr) * 2013-12-24 2015-07-02 Turkiye Petrol Rafinerileri Anonim Sirketi Tupras Système de production de bitume modifié

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115138233B (zh) * 2022-07-07 2023-11-10 江西华琪合成橡胶有限公司 一种胶料混合搅拌机构及方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB712072A (en) * 1951-05-18 1954-07-14 Crown Cork & Seal Co Improvements in or relating to liquid proportioning apparatus
GB1272258A (en) * 1968-10-29 1972-04-26 Solvay Werke Gmbh Colour mixing apparatus
US3915437A (en) * 1975-01-10 1975-10-28 Goodyear Tire & Rubber Mixing apparatus
DE2649602A1 (de) * 1975-11-05 1977-05-12 Massachusetts Inst Technology Verfahren und vorrichtung zum vermischen von mindestens zwei fluiden bestandteilen
EP0026874A1 (fr) * 1979-10-05 1981-04-15 Elastogran Maschinenbau GmbH & Co. Dispositif pour comparer et régler les flux des composants dans les mélangeurs pour matières plastiques à plusieurs composants
EP0463265A1 (fr) * 1990-06-26 1992-01-02 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé de distribution d'un mélange gazeux
FI940882L (fi) * 1994-02-25 1995-08-26 Ruutteri Oy Menetelmä ja laitteisto jauhemaisten aineiden sekoittamiseksi nesteisiin

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB712072A (en) * 1951-05-18 1954-07-14 Crown Cork & Seal Co Improvements in or relating to liquid proportioning apparatus
GB1272258A (en) * 1968-10-29 1972-04-26 Solvay Werke Gmbh Colour mixing apparatus
US3915437A (en) * 1975-01-10 1975-10-28 Goodyear Tire & Rubber Mixing apparatus
DE2649602A1 (de) * 1975-11-05 1977-05-12 Massachusetts Inst Technology Verfahren und vorrichtung zum vermischen von mindestens zwei fluiden bestandteilen
EP0026874A1 (fr) * 1979-10-05 1981-04-15 Elastogran Maschinenbau GmbH & Co. Dispositif pour comparer et régler les flux des composants dans les mélangeurs pour matières plastiques à plusieurs composants
EP0463265A1 (fr) * 1990-06-26 1992-01-02 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé de distribution d'un mélange gazeux
FI940882L (fi) * 1994-02-25 1995-08-26 Ruutteri Oy Menetelmä ja laitteisto jauhemaisten aineiden sekoittamiseksi nesteisiin

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006109149A1 (fr) * 2005-04-13 2006-10-19 Be.T.A. Strumentazione S.R.L. Procede d'etalonnage pour un appareil destine a la dilution d'un fluide
WO2014078883A3 (fr) * 2012-11-21 2014-12-31 Waizenauer Dietmar Installation de mélange pour milieux visqueux
WO2015099625A1 (fr) * 2013-12-24 2015-07-02 Turkiye Petrol Rafinerileri Anonim Sirketi Tupras Système de production de bitume modifié

Also Published As

Publication number Publication date
FI103500B (fi) 1999-07-15
FI103500B1 (fi) 1999-07-15
AU4542496A (en) 1996-08-21
FI950499A0 (fi) 1995-02-03
FI950499L (fi) 1996-08-04

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