EP3638411A1 - Verfahren und mischvorrichtung zur steuerung der einbringung eines pulverförmigen stoffes in eine flüssigkeit für ein inline-mischverfahren - Google Patents
Verfahren und mischvorrichtung zur steuerung der einbringung eines pulverförmigen stoffes in eine flüssigkeit für ein inline-mischverfahrenInfo
- Publication number
- EP3638411A1 EP3638411A1 EP18718687.9A EP18718687A EP3638411A1 EP 3638411 A1 EP3638411 A1 EP 3638411A1 EP 18718687 A EP18718687 A EP 18718687A EP 3638411 A1 EP3638411 A1 EP 3638411A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- time
- dependent
- mixing
- current consumption
- mixed product
- 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.)
- Granted
Links
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Classifications
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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
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/50—Mixing liquids with solids
- B01F23/51—Methods thereof
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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
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/50—Mixing liquids with solids
- B01F23/53—Mixing liquids with solids using driven stirrers
-
- 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
- B01F23/59—Mixing systems, i.e. flow charts or diagrams
-
- 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
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/23—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis
- B01F27/232—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis with two or more rotation axes
- B01F27/2321—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis with two or more rotation axes having different inclinations, e.g. non parallel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
- B01F27/61—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis about an inclined axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms
-
- 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
- B01F35/212—Measuring of the driving system data, e.g. torque, speed or power data
-
- 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
- B01F35/2209—Controlling the mixing process as a whole, i.e. involving a complete monitoring and controlling of the mixing process during the whole mixing cycle
-
- 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
- B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
- B01F35/2216—Time, i.e. duration, of at least one parameter during the operation
- B01F35/22162—Time of feeding of at least one of the components to be mixed
-
- 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
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/71755—Feed mechanisms characterised by the means for feeding the components to the mixer using means for feeding components in a pulsating or intermittent manner
Definitions
- Method and mixing device for controlling the introduction of a powdery substance into a liquid for an in-line mixing process
- the invention relates to a first method for controlling the introduction of a powdered substance in a liquid consisting of at least one component for an in-line mixing method according to the independent claim 1 and a corresponding second method according to the preamble of the independent claim 2, wherein the introduction and treatment the powdery substance is quasi under the reaction kinetic conditions of a residence time behavior of a continuously operating homogeneous reaction vessel takes place and a mixing device for performing the respective method.
- the mixer technology knows mixing processes which are operated batchwise or so-called in-line processes.
- the mixing of liquid and powdered substance is carried out kinetic reaction kinetically in a so-called batch-operated reaction vessel (mixing vessel).
- a certain amount of liquid is placed in the mixing container and it is so long supplied powdered substance until a desired or scheduled predetermined dry matter concentration of the powdered substance is present in the liquid.
- powdery substance and liquid are preferably continuously stirred and / or mixed to form a mixed product, and the mixed product is homogenized with the aim of uniform distribution of the pulverulent substance.
- the supply of the powdery substance can take place continuously or discontinuously.
- the mixing of liquid and pulverulent substance is carried out in a reaction-kinetic manner in a so-called continuously operated reaction vessel. be done (mixing container).
- mixing container A distinction is made between a single-pass and a multi-pass method.
- liquid and pulverulent material the latter either continuously or discontinuously, are fed to the mixing container and a mixed product corresponding to the supplied quantities of liquid and pulverulent material is continuously removed from the mixing container.
- Stirring and / or mixing or shearing and homogenization ensure that the theoretical postulate is that the mixed product has the same composition (eg dry matter concentration) at every point and that no temperature differences occur.
- the dry matter concentration in the discharged mixed product remains constant over the duration of the mixing process.
- a mixed product prepared in a first phase and adequately made to the one-pass process is recirculated in a second phase through the mixing vessel, wherein powdered material is further supplied either continuously or discontinuously.
- the mixed product is recirculated until it has a grown to a predetermined final dry matter concentration.
- various embodiments of the method are known, which provide that the entire mixed product discharged from the mixing container is either led again directly through the mixing process or first passed through a storage volume and then fed again to the mixing process. Between these two characteristics, any division ratios can be realized.
- the present invention is exclusively concerned with mixing processes, which are operated in the inline process and here in all possible forms (single pass and any variants of the multi-pass process).
- the mixing procedures and associated mixing equipment have been made public, for example, at the following Internet link: http://www.gea.com/products/ High-Shear-Inline-Mixer.isp ".
- US Pat. No. 3,425,667 A describes a one-pass process for the continuous, controlled mixing of pigments and fillers with binder solutions or other liquids, in which solid and liquid components are controlled in a controlled manner. Herten quantities are fed into a flow mixing device and mixed there with each other. The control involves measuring the ratio of liquid and solid components in the mixture after the mixture has passed through the flow mixer. The regulation of the liquid supply takes place as a function of this measurement, with the regulation of the supply of solids comprising separate control agents.
- the mixing devices mentioned above preferably also comprise so-called vacuum mixers which have a mixing container with a stirring and / or shearing and homogenizing device.
- the free surface of the liquid which may for example have a free fill level with a height between 0.4 to 4 m in the mixing vessel, is subject to a corresponding height range associated negative pressure to atmospheric pressure, for example, 0.2 to 0.8 bar, so that the Liquid on the one hand in the mixing process can be easily freed from gas components and on the other hand in the bottom region of the mixing container under all operating conditions has a negative pressure to atmospheric pressure.
- the introduction of the powdery substance into the mixing container takes place via an opening in the container wall below the free fill level.
- This opening continues in a tubular inlet connection in the direction of the outside of the mixing container, to which a pipeline leading to a powder reservoir, for example, is connected.
- the inlet nozzle and thus the pipeline are designed to be shut off via an inlet valve controlling the supply of the pulverulent material, so that on the one hand the mixing device is sealed off from its environment via this path and, on the other hand, an amount of pulverulent substance in the powder storage container in case of need due to the prevailing pressure conditions can be supplied automatically.
- a related mixing device with a preferably discontinuous supply of the powdery substance is described in the document DE 10 2015 016 766 A1.
- a discontinuous supply of the powdered substance has the advantage that the supply always takes place via the full open position of the inlet valve designed as a lifting valve, thereby minimizing the risk of clogging of the inlet valve.
- depend gig greater than the duration of the respective open position more or less large amounts of the powdery substance are intermittently introduced into the liquid, so that in principle there is a risk that it comes to appropriate agglomerations of the powdery substance by the stirring and / or shearing and homogenizing -Form to dissolve completely to the subsequent entry of powdered material, while at the same time the greatest possible uniform distribution of the powdery substance is desirable.
- This object is achieved in procedural terms by a first method with the features of the independent claim 1 and by a second method with the features of the independent claim 2. Furthermore, the object is achieved in device-technical terms by a mixing device for carrying out the respective method with the features of claim 12 or 13.
- the invention relates to a method for controlling the introduction of a pulverulent substance into a liquid consisting of at least one component for an inline Mixing process, wherein the term "component” is to be understood as meaning that these can generally be discrete, separate liquids which can also be supplied separately from one another to the mixing process.
- a one-step procedure is typically used to prepare low viscosity basic low dry matter base slurries or, for example, for skimmed milk powder in water or cocoa powder in milk or, more generally, when a powdery material with good solubility needs to be dissolved in a short time
- the goal being a predetermined, fixed time constant dry matter concentration of the powdered substance in the liquid.
- the liquid and the powdery substance are thereby continuously stirred and / or mixed to a mixed product and the mixed product is homogenized.
- the treatment processes “stirring”, in which no or only a very small mechanical force is applied to the mixed product, and “mixing”, in which applied to the mixed product a significant shearing force and therefore the “mixing” subsequently in this regard also
- the mixing product is continuously removed in accordance with the supplied quantities of liquid and powdered material
- a formulation of the mixed product is at least as far as the preset dry matter concentration and the reaction conditions are each specified in the form of default data.
- the idea of solution consists in that the discontinuous supply of the pulverulent substance takes place in a manner known per se in pulses by a chronological succession of metering pulses.
- the reaction conditions in this regard, in a preferred embodiment, that the powdery substance is sucked by a negative pressure (vacuum) in the headspace of the mixing vessel to atmospheric pressure.
- the metering pulses are each by a flow rate of the powdery substance rh P , a duration of the dosing pulse At1 and a time interval of adjacent dosing pulses At2.
- the predetermined dry matter concentration c is defined according to equation (1), wherein in the most general case, the flow rate of the powder Substance ih P is a time-dependent flow rate powdery substance ip (t) and a flow rate liquid rh F is a time-dependent flow rate liquid rh F (t):
- Ratio V is kept constant, and the predetermined dry matter concentration c is constant in the necessary manner.
- a significant control technical feature is that a time-dependent current consumption l (t) is determined which is proportional to a stirring and / or shearing and homogenizing power required for a temporarily present mixed product. The latter always occurs approximately in the form of a Gaussian normal distribution when a defined amount of powdered substance m P is introduced and treated in pulses in the mixing process or the mixing container.
- the time-dependent current consumption l (t) decays, namely to a reference current consumption l 0 , which is characteristic for the completely homogenized one Mixed product to be provided stirring and / or shearing and homogenizing performance.
- the relevant Reference current consumption l 0 is stored in the default data and can be used from there, and it depends on the recipe of the mixed product and the reaction conditions for the mixing process.
- the control measure according to the invention thus consists essentially in the fact that the duration of the metering pulse At1 and the time interval of adjacent metering pulses At2 are selected such that at the respective end of the interval of adjacent metering pulses At2 the time-dependent current consumption I (t) for stirring and / or or shearing and homogenizing of the temporarily present mixed product to the reference current absorption l 0 , which is required for the relevant treatment of the homogenized mixed product, within a practically acceptable tolerance.
- the invention is based on a known method for controlling the introduction of a pulverulent substance into a liquid consisting of at least one component for an in-line mixing process, which also classifies as a multi-pass process or a multi-stage process becomes.
- the multi-pass process is typically used for blended products which ultimately have a higher dry matter concentration and / or a higher viscosity, for example when larger amounts of powdered material need to be emulsified with oil, gum or flavors, because these blended products are mixed with the single pass feedstock. Method can not be displayed.
- the introduction and treatment of the powdery substance, kinetic reaction takes place, again, as in the first method, almost under the conditions of a residence time behavior of a continuously operating homogeneous reaction vessel.
- the second method is characterized in a conventional manner in such a way that presented in a first phase liquid in a mixing vessel and this liquid, the powdery substance is fed discontinuously, at the end of the first phase, a dry matter concentration is reached, which is below one for the End of the entire mixing process predetermined final value is.
- the liquid and the powdery substance are continuously stirred in the first phase and / or mixed to a mixed product and the mixed product is homogenized.
- the mixed product obtained in the first phase is recirculated through the mixing tank and it is further supplied to the recirculated amount of mixed product corresponding amounts of powdered material discontinuously.
- the mass balance is designed according to the continuity condition in such a way that the mass flow of mixed product discharged from the mixing process corresponds to the mass flow mixed product passing through the recirculation plus the metered flow rate of pulverulent substance.
- the mixed product is recirculated until a time-dependent course of a dry matter concentration of the powdery substance in the mixed product has grown to a predetermined final value.
- a formulation of the mixed product is predetermined in each case in the form of default data, at least with regard to the time-dependent course of a dry substance concentration assigned to the predetermined end value.
- the inventive idea of solution in the second method is that the discontinuous supply of the pulverulent substance is known in a manner known per se. se pulse manner is carried out by a temporal sequence of dosing pulses.
- the reaction conditions provide for the powdery substance to be sucked in through a negative pressure (vacuum) in the headspace of the mixing container relative to atmospheric pressure.
- the metering pulses are each characterized by a flow rate of the powdered substance rh P , a time duration of the metering pulse Et1 and a time interval of adjacent metering pulses At2.
- the multi-stage sequence in the second phase of the second method results in a time-dependent course of a dry matter concentration c (t), which ends according to plan in the predetermined end value, being between the course of a dry matter concentration without saturation character (approximately linear course) or Saturation character (degressive course) is to be distinguished.
- the time-dependent course of a dry matter concentration ending in the predetermined end value is defined according to the invention by the sequence of clearly defined metering pulses.
- a significant control technical feature is that a time-dependent current consumption l (t) is determined which is proportional to a stirring and / or shearing and homogenizing power required for a temporarily present mixed product.
- the latter always occurs in the form of approximately Gaussian normal distribution, if a defined amount of powdered Pululmoi substance introduced and treated in the mixing process or the mixing container.
- the relevant course of a reference current consumption l 0 (t) is stored in the default data and can be drawn from there, and it depends on the recipe of the mixed product and the reaction conditions for the mixing process.
- the duration of the dosing pulse At1 for the subsequent dosing pulse is shortened in the first case and extended in the second case.
- the time-duration interval ratio V is increased.
- This control measure with a variable time-to-interval ratio V requires the controller the ability to shorten or lengthen the duration of the metering pulse At1 with constant time interval of adjacent metering pulses .DELTA.2 or, with unchanged duration of the metering pulse At1 the time interval of adjacent metering pulses Adequately lengthen or shorten At2.
- the control measure according to the invention therefore essentially consists in both embodiments of the second method in that the duration of the metering pulse At1 and the time interval of adjacent metering pulses At2 are selected such that the current-dependent current consumption l (t) determined at the respective end of the interval of adjacent metering pulses At2 for stirring and / or shearing and homogenizing the temporarily present mixed product to the time-dependent course of a reference current absorption l 0 (t), which is required for the relevant treatment of the homogenized mixed product, within a practically acceptable tolerance.
- the second method which is primarily suitable for concentrating the dry matter concentration to a predetermined final value, comprises dividing the recirculated mixed product into a first portion and a second portion, feeding the first portion directly to the mixing process, and the complementary second portion passed over a storage volume and then also fed to the mixing process.
- This division offers the possibility, as suggested, to adjust the first fraction recirculated immediately above the mixing process between zero and one hundred percent of the recirculated mixed product.
- Such a configuration and mode of operation offers the possibility of concentrating smaller amounts of the desired mixed product exclusively in the mixing container at a maximum possible first proportion (100%).
- the flow rate of the powdery substance over the period of the metering pulse is constant. This is ensured, in particular, by virtue of the fact that a controllable opening for the supply of the pulverulent substance assumes only either a full open position or a closed position.
- another embodiment provides for both method that the shortening or extension of the duration of the metering pulse then takes place when a by a permissible current exceedance or a permissible current underflow each determined Stromkorridor by an upward deviating power consumption or a downward deviating power consumption is left.
- the permissible current overshoot and the permissible current undershoot are each by a percentage of the associated reference current consumption or the associated time-dependent course of a reference current consumption determined.
- the degree of shortening or lengthening of the duration of the metering pulse is determined as a function of the degree of deviation of the time-dependent current consumption from the associated reference current consumption or the associated time-dependent course of a reference current consumption.
- another embodiment provides for both methods that the control of the introduction of the powdered substance into the further recipe-dependent specification data underlying at least one liquid is based on empirical values Previous mixing processes are obtained and stored, these Vorga- a flow rate of the at least one liquid, a mixing or solution temperature (reaction temperature), a pressure above the liquid column, from which a reaction pressure results, speeds of means for stirring and / or shearing and Homogenize and one of the associated reference current consumption or the associated time-dependent course of a reference current consumption dependent allowable current exceedance and a permissible current underrun.
- another embodiment provides for both methods that the target-oriented recipe-dependent control parameters obtained during the control of the introduction of the pulverulent substance into the at least one liquid, namely, the duration of the metering pulse and the time interval between adjacent metering pulses, stored and used for subsequent control of the same recipes.
- a mixing device for carrying out the first method consists, in a manner known per se, of a mixing container which has an inlet connection for the supply for a liquid, a discharge nozzle for removal of a mixed product and a stirring device and / or a shearing and homogenizing device.
- an inlet valve is arranged with a valve closure member.
- the inlet valve can be adjusted with the valve closing element either between completely closed (closed position) or completely open (open position).
- a powdery substance is introduced into the liquid with the inlet valve, wherein the valve closure member can be transferred into the closed position or into the open position by means of a control device associated with the inlet valve.
- the control device of the mixing device provides formulation-dependent default data and recipe-dependent control parameters in the form of the duration of the metering pulse and the time interval of adjacent metering pulses. Furthermore, the control device according to the invention has at least one signal sensor designed as a measuring device, which detects a time-dependent current consumption of the stirring device and / or the shearing and homogenizing device. Equipped with these properties, the control device controls the closing or the open position of the valve closure member as a function of the time-dependent current consumption and in relation to the default data and the control parameters.
- a mixing device for carrying out the second method is constructed substantially adequately to the mixing device for carrying out the first method.
- the difference results from the task underlying the second method, by recirculation of the mixed product to achieve the greatest possible concentration of small to largest amounts of mixed product with pulverulent material.
- a constructive supplement to the mixing device in the form of a circulation line is provided which branches off from a line connected to the outlet connection and opens directly into the mixing container.
- valve closing member is formed at least in its powder-loaded area as a diameter-equal cylindrical rod on the same diameter a valve plate is formed.
- valve closing member When the inlet valve is in its full open position, the valve closing member is due to this embodiment largely moved out of the fully formed flow of the powdered substance so that it is not a flow obstacle on the one hand and on the other hand is a seat seal, which is in the valve plate recording, in the vicinity of the wall of a valve housing and thus outside of the fully formed flow region of the pipe flow and is at most only affected by the near-wall, stagnant flow in this edge region.
- 1a shows a schematic representation of a mixing device for an in-line mixing method, which can be operated as a second method, a so-called multi-pass method;
- FIG. 3 is a qualitative representation for the first method of a time-dependent current consumption l (t) for a sequence of dosing pulses with a constant duration of the dosing pulse At1 and with a time interval of adjacent dosing pulses At2;
- FIG. 4 is a qualitative representation of the first method, a time-dependent current consumption l (t) for a sequence of metering pulses with a constant duration of the metering pulse At1 / 2 and with a time interval of adjacent metering pulses At2 / 2;
- FIG. 5 shows a qualitative depiction for the second method of a time-dependent current consumption l (t) for a sequence of metering pulses with a constant duration of the metering pulse At1 and with a constant time interval of adjacent metering pulses At2 for realizing a time-dependent approximately linearly increasing course of a dry matter Concentration (without saturation character) and Figure 6 in a qualitative representation for the second method, a time-dependent current consumption l (t) for a sequence of dosing pulses with a steadily decreasing duration of the dosing At1 and with a constant time interval of adjacent Dosierimpulse At2 to realize a time-dependent degressive course a desiccant concentration (with saturation character).
- a mixing device 1000 has inter alia a mixing container 100, which consists of a preferably cylindrical container casing 100.1, an upper container bottom 100.2 and a lower container bottom 100.3.
- the lower container bottom 100.3 preferably tapers downwards, usually conically or in the form of a circular cone, and has at the lower end an outlet connection 100.4 for a mixed product M, which is removed with a mixed flow rh M.
- the mixing tank 100 is fed via a feed port 100.5 a liquid F with a flow rate liquid m F , which forms a free level N, above the usually in the subject mixing device 1000 (vacuum mixer), a pressure above the liquid column p, a negative pressure opposite atmospheric pressure, prevails.
- the inlet valve 20 is used for the discontinuous supply of a powdered substance P with a mass flow of powdered material m P , which is supplied via a feed line 18, into the liquid F or into the mixed product M.
- the inlet valve 20 is associated with a control device 30, which is provided with a control head housing 14 of the inlet valve 20 communicates via a signal line 22 and the inlet valve 20, if necessary, transferred to its open or closed position.
- the required stirring action can also be achieved by means of fluidics, for example by pumping the liquid F or the mixed product M via a circulation line, not shown in FIG. 1, or a circulation line 28 having a preferably tangential inlet of the liquid F or the mixed product as shown in FIG M in the mixing container 100, reached or supported.
- the mixed product M should be read and vice versa.
- the stirring device 24 is preferably in the lower region of the lower container bottom 100.3 and preferably eccentrically in this a driven by a second drive motor 50 at a rather high second speed n2 shearing and homogenizing device 26 is provided.
- This sucks the liquid F preferably on the one hand from above and throws them on the other hand ring in the near-wall region of the lower tank bottom 100.3 such that preferably forms an outwardly inwardly directed circulation flow in the mixing vessel 100.
- liquid F and powdered substance P or the resulting mixed product M are very intensively mechanically mixed and preferably homogenized.
- the inlet valve 20 is designed as a lifting valve ( Figure 2). It has a valve seat 2 a in a valve housing 2 a and a cooperating with this valve plate 8a, which is formed on a valve closing member 8. As a rule, the valve closing member 8 receives a seat seal 10, which in the closed position of the inlet valve 20 in cooperation with the valve seat 2a causes the seal.
- the valve seat 2a has a seat opening 2b, through which the pulverulent substance P supplied via a pipe connection 2c from the supply line 18 is introduced into the liquid F (FIG. 1).
- the seat opening 2b is with the valve plate 8a between fully closed, the closed position, o- fully open, the open position, adjustable.
- the valve housing 2 is connected via a lantern housing 4 with a drive housing 6 for driving the valve closure member 8.
- valve closure member 8 is at least in its powder-loaded area as a diameter-equal cylindrical rod formed on the diameter equal to the valve plate 8a is formed.
- the control device 30 (FIG. 1) has at least one signal sensor 16.
- the at least one signal sensor 16 is a measuring device, for example for mixing parameters, such as, for example, the volume flow liquid rh F , the pressure above the liquid column p in the mixing tank 100, a mixing or solution temperature T of the liquid F, a dry matter concentration c or a time-dependent course of a dry matter Concentration c (t), rotational speeds n1, n2 and a time-dependent current consumption l (t) of the stirring and / or shearing and homogenizing device 24, 26.
- the signal sensor 16 is shown in FIG. 1 by way of example for the time-dependent current consumption l (t). of the second drive motor 50 of the shearing and homogenizing device 26.
- additional or alternative further measuring devices can be provided which determine the other mixing parameters.
- a mixing device 1000 for the second method differs from that for the first method only in that a circulation line 28 is provided, which branches off from a line connected to the outlet connection 100.4 and directly into the mixing vessel 100, preferably via its own recirculation port 100.6, opens ,
- the line connected to the outlet connection 100.4 can be guided via one or more storage containers and finally connected to the inlet connection 100.5.
- the introduction and treatment of the powdery substance P takes place quasi under the reaction kinetic conditions of a residence time behavior of a continuously operating homogeneous reaction vessel. It will be the liquid F via the inlet port 100.5 with the flow rate liquid m F , which can be a time-dependent flow rate liquid (m F (t)) in the most general case, and the powdered substance P via the inlet valve 20 discontinuously with the flow rate powdered substance m P , in the In the most general case, a time-dependent flow rate of pulverulent substance (m P (t)) may also be supplied to the mixing process in the mixing vessel 100, the target being the predetermined, unchanging, dry matter concentration c of the pulverulent substance P in the liquid F.
- the liquid F and the powdery substance P are continuously stirred and / or mixed to the mixed product M and the mixed product M is homogenized.
- the mixed product M is discharged continuously in accordance with the supplied amounts of liquid F and powdered substance P with the flow rate mixed product m M.
- the discontinuous supply of the powdery substance P takes place over a period of time t pulse-wise by a chronological sequence of metering pulses i (FIGS. 3 and 4) which respectively characterize the flow rate of the pulverulent substance m P , a duration of the metering pulse At1 and a time interval of adjacent metering pulses At2 are.
- the shearing and homogenizing device 26 for example, is connected to the second drive motor 50 in the same way.
- the time-dependent current consumption l (t) applied over the corresponding time duration t is determined or measured.
- the latter is proportional to a mixing and / or shearing and homogenizing power (FIG. 1) required for a mixing product M * temporarily present in the mixing container 100 immediately after the metering pulse i, which is produced by the stirring and / or shearing and homogenizing Device 24, 26 is applied at this stage of the treatment.
- the course of the time-dependent current consumption l (t) is similar to a Gaussian distribution curve, it increases with the intermittently entering mass flow of powdery substance rp, reaches a maximum, and then after dissolution of the powdered substance P, ie at a then achieved homogenized mixed product M to gradually decrease to an initial value.
- this typical behavior is utilized in terms of control technology in that a reference current consumption I 0 is used which is characteristic of the stirring and / or shearing and homogenizing power to be produced on the homogenized mixed product M.
- the tolerance consists in a specification of a permissible current overshoot AM and in a permissible current undershoot ⁇ 2 (FIG. 3).
- the shortening or the extension of the duration of the metering pulse At1 takes place when a current corridor determined by the permissible current excess ⁇ 1 or the permissible current shortage ⁇ 2 is determined by the time-dependent current consumption l * (t), l ** (t) deviating upwards or downwards. is left.
- the permissible excess current and the permissible current undershoot AM, ⁇ 2 are preferably each determined by a percentage of the associated reference current consumption l 0 .
- the degree of shortening or extension of the duration of the metering pulse At1 is preferably determined as a function of the degree of deviation of the time-dependent current consumption l (t) from the associated reference current consumption l 0 .
- the permissible excess current AM which is ultimately determined by the respective recipe of the mixed product M, and the permissible current shortage ⁇ 2 can be part of the specification data D for the mixing process.
- targeted recipe-dependent control parameters S namely the duration of the metering pulse ⁇ and the time interval of adjacent metering pulses At2 are stored and used for subsequent control of the same recipes.
- the control device 30 of the mixing device 100 according to the invention is set up so that it can provide the formulation-dependent default data D and the formulation-dependent control parameters S in the form of the duration of the metering pulse At1 and the time interval of adjacent metering pulses At2.
- the control device 30 furthermore has at least the signal sensor 16 designed as a measuring device (FIG. 1), which detects the time-dependent current consumption l (t) of the stirring device 24 and / or the shearing and homogenizing device 26 (FIGS. 3, 4).
- the control device 30 controls the closing or the open position of the valve closing member 8 (FIG. 2) as a function of the time-dependent current consumption l (t) and in relation to the default data D and the control parameters S.
- liquid F is introduced into the mixing container 100 (feed via the feed connection 100.5) and the powdered substance P is fed discontinuously to this total introduced liquid F via the inlet valve 20 with the mass flow of pulverulent substance m P , at the end of the first Phase a dry matter concentration c is reached, which is below a predetermined end of the entire mixing process final value c E.
- the liquid F and the powdery substance P are continuously stirred by means of the stirring device 24 and / or mixed by means of the shearing and homogenizing device 26 to the mixed product M and the mixed product M is homogenized.
- the mixed product M obtained in the first phase is recirculated via the mixing tank 100 and it is further recirculated Amount of mixed product M corresponding amounts of powdered substance P fed discontinuously.
- the amount of mixed product M discharged into the recirculation can be divided into a first portion a and a second portion b ((a + b) M). Accordingly, in the second phase at constant level N, the mass balance is necessarily based on the continuity condition.
- the mixed product M is recirculated until a time-dependent course of a dry matter concentration c (t) of the powdery substance P in the mixed product M has grown to the predetermined final value CE.
- a formulation of the mixed product M are predetermined at least in terms of the time-dependent course of a dry matter concentration c (t) assigned to the predetermined end value CE and the reaction conditions in each case in the form of the default data D.
- the inventive idea of solution corresponds in essential features to that according to the first method.
- the multi-stage sequence in the second phase of the second method results in the time-dependent course of a dry matter concentration c (t), which ends according to plan in the predetermined end value CE, wherein between the course of a dry matter concentration c (t) without saturation character 5) or with a saturation character (degressive time-dependent progression, see FIG.
- the time-dependent course of a dry substance concentration c (t) ending in the predetermined final value c E is defined by the sequence of specific metering pulses i, ie uniquely determined by the duration of the metering pulse At1 and the interval of adjacent metering pulses At2.
- the time-dependent current consumption l (t) decays, namely on a time-dependent course of a reference current consumption l 0 (t), which is characteristic of the homogenized mixed product M under the conditions of the associated time-dependent course of a dry matter concentration c (t) to be provided agitating and / or shearing and homogenizing Performance (see Figure 5: approximately linear time-dependent Course of a reference current consumption l 0 (t); Figure 6: degressive time-dependent course of a reference current consumption l 0 (t)).
- the relevant course of a reference current consumption l 0 (t) is stored in the default data D, and it depends on the recipe of the mixed product M and the reaction conditions for the mixing process.
- the duration of the dosing pulse At1 for the subsequent dosing pulse is shortened in the first case and longer in the second case!
- the flow rate of powdered material m P is introduced in the period t of the entire mixing process at approximately constant level N in the mixing vessel 100 in a present almost invariable volume of the mixed product V M (V M »constant), with a density P of the mixed product M increases, namely according to the time-dependent course of a dry matter concentration c (t), which grows to the predetermined end value CE.
- a related course describes a successful mixing process, which on the one hand protects the mixed product M and on the other hand is designed to be energy-efficient. It does not require control measures in the sense explained above. Only when deviations from the permissible current exceeding or current undershooting ⁇ , ⁇ 2 occur, the control mechanisms, as described for the first method in connection with FIGS. 3 and 4, apply mutatis mutandis.
- control devices 30 with a variable time-interval ratio V require the control device 30 to be able to shorten or lengthen the duration of the metering pulse At1 with a constant interval of adjacent metering pulses ⁇ 2 or, if the metering pulse At1 has not changed, the interval between adjacent metering pulses ⁇ 2 adequately extend or shorten.
- control measures according to the invention thus consist essentially in both embodiments of the second method in that the time duration of the metering pulse At1 and the interval between adjacent metering pulses .DELTA..2 are selected so that at the respective end of the interval of adjacent metering pulses .DELTA.2 the time-dependent determined power consumption l (t) for stirring and / or mixing and homogenizing the temporarily present mixing product M * to the time-dependent course of a reference current absorption l 0 (t), which is required for the relevant treatment of the homogenized mixed product M, within a practically acceptable tolerance , REFERENCE LIST OF ABBREVIATIONS USED
- V At1 / At2
- V M Volume of the mixed product Density of mixed product a first fraction (immediate recirculation)
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Accessories For Mixers (AREA)
Abstract
Description
Claims
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PL18718687T PL3638411T3 (pl) | 2017-06-13 | 2018-04-03 | Sposób i urządzenie mieszalnikowe do sterowania wprowadzaniem materiału proszkowego do cieczy dla sposobu mieszania przepływowego |
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DE102017005573.4A DE102017005573B3 (de) | 2017-06-13 | 2017-06-13 | Verfahren und Mischvorrichtung zur Steuerung der Einbringung eines pulverförmigen Stoffes in eine Flüssigkeit für ein Inline-Mischverfahren |
DE102017005574.2A DE102017005574B3 (de) | 2017-06-13 | 2017-06-13 | Verfahren und Mischvorrichtung zur Steuerung der Einbringung eines pulverförmigen Stoffes in eine Flüssigkeit für ein Batch-Mischverfahren |
PCT/EP2018/000148 WO2018228714A1 (de) | 2017-06-13 | 2018-04-03 | Verfahren und mischvorrichtung zur steuerung der einbringung eines pulverförmigen stoffes in eine flüssigkeit für ein inline-mischverfahren |
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EP18718686.1A Active EP3638409B1 (de) | 2017-06-13 | 2018-04-03 | Verfahren und mischvorrichtung zur steuerung der einbringung eines pulverförmigen stoffes in eine flüssigkeit für ein batch-mischverfahren |
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JP (1) | JP6952802B2 (de) |
AU (2) | AU2018285478B2 (de) |
DK (2) | DK3638411T3 (de) |
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US3425667A (en) | 1967-03-31 | 1969-02-04 | Inst Lacke & Farben | Method and apparatus for making paints |
DE10345161A1 (de) * | 2003-09-29 | 2005-05-04 | Bvg Bauer Verfahrenstechnik | Verfahren und Vorrichtung zum Herstellen einer Aufschlämmung aus Trockenpigmenten und Flüssigkeit in der Papierfabrikation |
DE102015016766B4 (de) | 2015-11-23 | 2023-04-13 | Gea Tds Gmbh | Einlaufventil, Mischvorrichtung und Steuerverfahren zur Einbringung eines pulverförmigen Stoffes in eine Flüssigkeit |
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AU2018285004B2 (en) | 2020-11-12 |
DK3638409T3 (da) | 2021-11-01 |
DK3638411T3 (da) | 2021-11-01 |
AU2018285478B2 (en) | 2020-12-10 |
AU2018285004A1 (en) | 2019-12-12 |
AU2018285478A1 (en) | 2019-11-21 |
NZ758627A (en) | 2020-10-30 |
PL3638409T3 (pl) | 2022-01-31 |
JP2020523188A (ja) | 2020-08-06 |
EP3638411B1 (de) | 2021-08-04 |
NZ759145A (en) | 2020-11-27 |
PL3638411T3 (pl) | 2022-01-31 |
EP3638409A1 (de) | 2020-04-22 |
EP3638409B1 (de) | 2021-08-04 |
WO2018228714A1 (de) | 2018-12-20 |
JP6952802B2 (ja) | 2021-10-20 |
WO2018228713A1 (de) | 2018-12-20 |
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