EP1514592B1 - Process and apparatus for static mixing, especially for the glueing of lignocellulosic fibers using a binder - Google Patents

Process and apparatus for static mixing, especially for the glueing of lignocellulosic fibers using a binder Download PDF

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Publication number
EP1514592B1
EP1514592B1 EP04019796A EP04019796A EP1514592B1 EP 1514592 B1 EP1514592 B1 EP 1514592B1 EP 04019796 A EP04019796 A EP 04019796A EP 04019796 A EP04019796 A EP 04019796A EP 1514592 B1 EP1514592 B1 EP 1514592B1
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EP
European Patent Office
Prior art keywords
mixing
flow
mixing arrangement
substances
arrangement
Prior art date
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EP04019796A
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German (de)
French (fr)
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EP1514592A1 (en
Inventor
Wolfgang Stahl
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Glunz AG
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Glunz 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
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4311—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being adjustable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
    • B01F25/3141—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector mixers
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/211—Measuring of the operational parameters
    • B01F35/2113—Pressure
    • 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
    • B01F35/222—Control or regulation of the operation of the driving system, e.g. torque, speed or power of motors; of the position of mixing devices or elements
    • 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
    • B01F35/222—Control or regulation of the operation of the driving system, e.g. torque, speed or power of motors; of the position of mixing devices or elements
    • B01F35/2221—Control or regulation of the operation of the driving system, e.g. torque, speed or power of motors; of the position of mixing devices or elements the position of baffles used to modify the flow in a conduit or a container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B27N1/029—Feeding; Proportioning; Controlling

Definitions

  • the invention relates to a mixing method with the features of the preamble of patent claim 1 and a static mixer with the features of the preamble of claim 8.
  • Static mixers and mixing processes resulting from their operation are known from many fields of application.
  • the substances to be mixed together which may be particulate solid substances and / or liquid substances, are passed in a liquid or gas flow through a mixing arrangement which provides turbulence to the flow, which in turn becomes the desired one Mixing of the substances leads.
  • a mixing method with the features of the preamble of patent claim 1 and a static mixer with the features of the preamble of claim 8 are known from DE 102 16 458 C1.
  • rotatable and thus adjustable mounted paint elements are provided which have a recess in their component wall.
  • the Adjustability of the inflow elements makes it possible to define different functional positions of the inflow elements.
  • at least one functional position namely an inflow position, is provided, in which the component walls of the inflow elements protrude into a mixing chamber.
  • the mixing chamber is partially narrowed in the inflow position of the inflow elements, so that the flow of the substances flowing in the mixing chamber is deflected.
  • an electromotive, hydraulic or pneumatic drive device is assigned to them.
  • MDF medium-density fiberboards
  • the current state of the art in the gluing of lignocellulosic fibers for the production of fibreboard is the gluing in a blowpipe between the wet lignocellulosic fibers emitting refiner and a downstream dryer for the fibers.
  • the binder is sprayed in the input region of the blow pipe behind the refiner on the wet fibers guided by a gas flow.
  • This gluing process which is a special form of mixing process, has the disadvantage that it is associated with an increased binder consumption, which is about 20% above the binder consumption in the Trommelmischerbeleimung.
  • the clear reasons for this increased binder consumption could not be fully clarified.
  • One reason may be that an ideally uniform distribution of the binder on the lignocellulosic fibers before they enter the dryer, thereby fixing the binder on the fibers so that further distribution is at least severely hindered, is not achieved.
  • DE 197 40 676 C2 discloses a tower as a static mixer for mixing fibers and binder in a laterally limited flow, in which or on the wall means for vortexing the fibers are arranged, which are designed as baffles, baffles or the like and adjustable can. The manner of adjustability of such means for entangling the fibers but nothing is carried out here.
  • DE 101 39 128 A1 discloses a method and a device for vacuum impregnation of small-particle material in an evacuatable impregnation chamber, which can be designed for example as a rotatable drum with adjustable blades for mixing the material and the impregnating agent. Furthermore, measuring and Control circuits provided with which, for example, monitors the pressure or the pressure change in the impregnation and the respective measurement is used to change the speed of a feed and discharge screw depending on the discontinued material and impregnation so that a maximum vacuum seal is guaranteed
  • DE 196 17 384 A1 relates to an arrangement and a method for controlling the mixture of two gas volume flows through a Venturi nozzle via its nozzle needle. It is about such a control that the predetermined mixing ratio of the two gas flow rates is maintained.
  • DE 40 39 903 A1 relates to a device and a method for mixing steam with water.
  • a safe operation is achieved by reducing an annular gap in a water pipe acted upon with water until a differential pressure across the annular gap reaches a certain value. Through the annular gap flows only the water.
  • the invention has for its object to provide an improved mixing method of the type described above and a static mixer to implement it, with which various substances are controlled miscible even under adverse conditions.
  • the object of the invention is achieved by a mixing method with the features of claim 1 and a static mixer with the features of claim 8.
  • the mixing work currently performed by the mixing device on the substances to be mixed together is controlled by adjusting the mixing tools.
  • the mixing work that is, the energy consumption during mixing, proves to be a suitable criterion for achieving a sufficient mixing of the substances to be mixed. It can be assumed that the mixing arrangement detects the individual components of the substances uniformly.
  • the mixing tools of the mixing arrangement are adjusted in the new mixing method, which are connected for this purpose, for example with adjusting actuators.
  • the mixing work of mixing tools can be changed, for example, by moving them further into or out of the laterally limited flow, whereby the free cross section and / or the course of the free cross section of the flow changes in each case.
  • a decreasing free cross-section of the flow corresponds to an increasing mixing work and vice versa.
  • At least one pressure in the flow can be determined.
  • the new mixing method is monitored by a pressure drop in the flow over the mixing assembly. This pressure drop is a direct measure of the mixing work done by the mixing process. When a pressure drop of a certain magnitude results, it means that the mixing process has performed a certain mixing work per volume of the flow passed through the mixing arrangement.
  • the pressure in the flow before and after the mixing arrangement can be measured.
  • the pressure drop is then the difference between these two pressures.
  • At least one mixing tool of the mixing arrangement can be adjusted to correct the pressure drop at a deviation of the pressure drop from a predetermined setpoint value beyond a limit value.
  • the mixing arrangement is thus adapted, for example, to varying external parameters, in order to independently always carry out the same mixing work per volume of the passing flow.
  • the novel mixing method in which a liquid substance and a particulate solid substance on which the liquid substance is to be distributed are guided by a gas flow through the mixing arrangement.
  • the flow may also be a liquid flow and, for example, two particulate solid substances may also be mixed with one another.
  • one of the substances to be mixed with each other can also form the flow completely or partially. It is also possible to mix several gaseous substances together by the new mixing method.
  • the substances to be mixed together are a liquid binder which is to be distributed uniformly on lignocellulose-containing fibers.
  • the new mixing method is suitable for use in gluing in a blowpipe, in which the binder is distributed over the moist lignocellus-containing fibers emerging from a refiner.
  • the new static mixer is characterized in that the mixing tools are adjustable in order to control the mixing work currently being performed by the mixing arrangement on the substances to be mixed together.
  • the new mixer can have a measuring device for at least one pressure in the flow channel.
  • a measuring device is provided for a pressure drop in the flow channel above the mixing arrangement.
  • the measuring device in each case comprises a pressure probe in front of and behind the mixing arrangement in the flow channel.
  • the mixing arrangement of the new mixer comprises at least one mixing tool that can be adjusted such that the pressure drop of a flow in the flow channel above the mixing arrangement is variable.
  • a control device may be provided which uses the pressure drop across the mixing arrangement as input signal, and at an exceeding of a limit deviation of the pressure drop from a predetermined setpoint adjusts the mixing tool.
  • the mixing assembly may also include a plurality of adjustable tools that are actuated by the control device.
  • the flow passage of the new mixer has an inlet for a particulate solid substance-promoting gas flow and a spray nozzle for a liquid substance to be distributed on the particulate solid substance.
  • the mixer can be arranged in a blowing line between a moist lignocellulos terme fibers emitting refiner and a dryer for the fibers.
  • the liquid substance injector nozzle may be disposed within the mixer upstream of the mixing assembly, within the mixing assembly and, in certain instances, even downstream of the mixing assembly. A position of the injection nozzle downstream of the mixing arrangement may be considered if the turbulence of the particulate solid substance induced by the mixing arrangement in the flow is sufficient for a distribution of the subsequently sprayed-on liquid substance.
  • the injection nozzle can also open into the flow channel in the immediate area of a single mixing tool.
  • the injection nozzle can also open into the flow channel in the immediate area of a single mixing tool.
  • both individual injection nozzles can be provided at several different locations as well as a plurality of injection nozzles at one or more locations of the mixer.
  • the static mixer 1 shown in longitudinal section in FIG. 1 has a laterally limited flow channel 2 which extends between two connecting flanges 3 and 4.
  • the opening of the flow channel 2 at the connection flange 3 forms an inlet 5 for a Gas flow from 6, which conveys a particulate solid substance, such as lignocellulosic fiber through the flow channel 2 until it emerges at an outlet 7 again from the static mixer 1, which is formed by an opening of the flow channel 2 at the containment flange 4.
  • the static mixer 1 has a connection flange 8, on which a Einsprühdüse not shown here can be fixed so that with her a liquid substance 9, such as a liquid binder, can be sprayed on the side of the gas flow 6 promoted particulate solid substance ,
  • a mixing assembly 10 is provided with a plurality of mixing tools 11 to 16 in the flow channel 2.
  • the mixing tools 11 to 16 fluidize the gas flow 6 passed through the mixing arrangement 10, so that the substances guided by the gas flow intimately mix with one another. This is synonymous with the desired distribution of the liquid substance 9 on the particulate solid substance with a particularly uniform distribution.
  • the mixing tools 11 to 16 in FIG. 1 are those 11 to 13, which bring about a local constriction of the cross section of the flow channel 2 from the outside, and those 14 to 16, which are arranged centrally in the flow channel 2.
  • the flow channel 2 is limited exclusively by a cylindrical tube 17 which extends between the connecting flanges 3 and 4.
  • the mixing work performed by the mixing assembly 10 on the gas flow 6 causes a pressure drop in the gas flow 6 over the mixing assembly 10. This pressure drop is measured with pressure probes 18 and 19 which detect the pressure of the gas flow 6 in front of and behind the mixing assembly 10.
  • the measuring signals 20 and 21 of the pressure probes 18 and 19 are the input signals of a monitoring and control device 22, which monitors the operation of the static mixer 1.
  • the monitoring and control device 22 sends activation signals 23 to 28 to the mixing tools 11 to 16, as a result of which the mixing tools 11 to 16 be adjusted so that they increase or decrease the pressure drop across the mixing assembly 10 as needed.
  • the mixing tools 11 to 13 further moved towards each other or further away from each other and the mixing tools 14 to 16 pivoted within the flow channel 2, which is indicated by double arrows.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Disintegrating Or Milling (AREA)
  • Paper (AREA)

Abstract

In a process to make chipboard wood particles are shredded and then mixed with a binding agent. The particles advance through a mixer (10) tunnel with mixer tools (11-16), at least one of which is at rest. The mixer tool positions are adjustable and regulate the mixer operation.

Description

Die Erfindung betrifft ein Mischverfahren mit den Merkmalen des Oberbegriffs des Patentanspruchs 1 sowie einen statischen Mischer mit den Merkmalen des Oberbegriffs des Patentanspruchs 8.The invention relates to a mixing method with the features of the preamble of patent claim 1 and a static mixer with the features of the preamble of claim 8.

STAND DER TECHNIKSTATE OF THE ART

Statische Mischer und aus ihrem Betrieb resultierende Mischverfahren sind aus vielen Anwendungsgebieten bekannt. In aller Regel werden die miteinander zu vermischenden Substanzen, bei denen es sich um teilchenförmige, feste Substanzen und/oder flüssige Substanzen handeln kann in einer Flüssigkeits- oder Gasströmung durch eine Mischanordnung hindurchgeführt, die für eine Verwirbelung der Strömung sorgt, welche ihrerseits zu der gewünschten Vermischung der Substanzen führt.Static mixers and mixing processes resulting from their operation are known from many fields of application. In general, the substances to be mixed together, which may be particulate solid substances and / or liquid substances, are passed in a liquid or gas flow through a mixing arrangement which provides turbulence to the flow, which in turn becomes the desired one Mixing of the substances leads.

Viele bekannte statische Mischer verfügen über fest eingestellts Mischanordnungen. Als variable Betriebsparameter dienen die physikalischen Parameter der durch die statischen Mischer strömenden Strömung.Many known static mixers have fixed mixing arrangements. The physical parameters of the flow flowing through the static mixers serve as variable operating parameters.

Ein Mischverfahren mit den Merkmalen des Oberbegriffs des Patentanspruchs 1 sowie ein statischer Mischer mit den Merkmalen des Oberbegriffs des Patentanspruchs 8 sind aus der DE 102 16 458 C1 bekannt. Hier sind drehbare und somit verstellbar gelagerte Anströrmelemente vorgesehen, die in ihrer Bauteilwandung eine Vertiefung aufweisen. Die Verstellbarkeit der Anströmelemente ermöglicht es, verschiedene Funktionsstellungen der Anströmelemente zu definieren. Dabei ist zumindest eine Funktionsstellung, nämlich eine Anströmstellung, vorgesehen, bei der die Bauteilwandungen der Anströmelemente in eine Mischkammer hineinragen. Dadurch wird die Mischkammer in der Anströmstellung der Anströmelemente bereichsweise verengt, so dass die Strömung der in der Mischkammer fließenden Substanzen umgelenkt wird. Dadurch ist es insbesondere möglich, in der Mischkammer Strömungsverhältnisse einzustellen, die für die homogene Mischung der Komponenten geeignet sind. Um die Anströmelemente ferngesteuert verstellen zu können, ist ihnen eine elektromotorische, hydraulische oder pneumatische Antriebseinrichtung zugeordnet.A mixing method with the features of the preamble of patent claim 1 and a static mixer with the features of the preamble of claim 8 are known from DE 102 16 458 C1. Here rotatable and thus adjustable mounted paint elements are provided which have a recess in their component wall. The Adjustability of the inflow elements makes it possible to define different functional positions of the inflow elements. In this case, at least one functional position, namely an inflow position, is provided, in which the component walls of the inflow elements protrude into a mixing chamber. As a result, the mixing chamber is partially narrowed in the inflow position of the inflow elements, so that the flow of the substances flowing in the mixing chamber is deflected. This makes it possible in particular to set flow conditions in the mixing chamber which are suitable for the homogeneous mixing of the components. In order to be able to remotely control the inflow elements, an electromotive, hydraulic or pneumatic drive device is assigned to them.

Bei der Herstellung von Faserplatten, insbesondere sogenannten mitteldichten Faserplatten (MDF) stellt die Beleimung der lignocellulosehaltigen Fasern mit dem Bindemittel ein bekanntes Problem dar. Zu Beginn der Entwicklung erfolgte die Beleimung in Trogmischern, was jedoch häufig zu Faseragglomeraten und -verfilzungen führte. Resultat war eine ungleichmäßige Faserbeleimung, die sich in der unerwünschten Ausbildung von Leimflecken an den Plattenoberflächen zeigte.In the production of fiberboards, in particular so-called medium-density fiberboards (MDF), the gluing of the lignocellulose-containing fibers with the binder is a known problem. At the beginning of the development, the gluing took place in tray mixers, which however often led to fiber agglomerates and mattings. The result was uneven fiber sizing, which was evidenced by the undesirable formation of glue stains on the surfaces of the plates.

Der aktuelle Stand der Technik bei der Beleimung von lignocellulosehaltigen Fasern für die Herstellung von Faserplatten ist die Beleimung in einer Blasleitung zwischen einem die feuchten lignocellulosehaltigen Fasern abgebenden Refiner und einem nachgeschalteten Trockner für die Fasern. Hierbei wird das Bindemittel im Eingangsbereich der Blasleitung hinter dem Refiner auf die von einer Gasströmung geführten nassen Fasern gesprüht. Dieses Beleimungsverfahren, das eine spezielle Form eines Mischverfahrens darstellt, weist den Nachteil auf, dass es mit einem erhöhten Bindemittelverbrauch verbunden ist, der um ca. 20 % über dem Bindemittelverbrauch bei der Trommelmischerbeleimung liegt. Trotz umfangreicher Untersuchungen konnten die eindeutigen Gründe für diesen erhöhten Bindemittelverbrauch nicht vollständig geklärt werden. Ein Grund mag darin liegen, dass eine ideal gleichmäßige Verteilung des Bindemittels auf den lignocellulosehaltigen Fasern, bevor diese in den Trockner eintreten, wodurch das Bindemittel auf den Fasern so weit fixiert wird, dass eine weitergehende Verteilung zumindest stark behindert ist, nicht erreicht wird.The current state of the art in the gluing of lignocellulosic fibers for the production of fibreboard is the gluing in a blowpipe between the wet lignocellulosic fibers emitting refiner and a downstream dryer for the fibers. In this case, the binder is sprayed in the input region of the blow pipe behind the refiner on the wet fibers guided by a gas flow. This gluing process, which is a special form of mixing process, has the disadvantage that it is associated with an increased binder consumption, which is about 20% above the binder consumption in the Trommelmischerbeleimung. Despite extensive investigations, the clear reasons for this increased binder consumption could not be fully clarified. One reason may be that an ideally uniform distribution of the binder on the lignocellulosic fibers before they enter the dryer, thereby fixing the binder on the fibers so that further distribution is at least severely hindered, is not achieved.

Man mag daran denken, die Vermischung des Bindemittels mit den Fasern, d.h. die Verteilung des Bindemittels auf den Fasern durch einen statischen Mischer in der Blasleitung zwischen dem Refiner und dem Trockner zu erhöhen. Dabei besteht aber die Gefahr eines Aufbaus von beleimten Fasern an den Mischwerkzeugen, wenn keine optimalen Betriebsbedingungen des statischen Mischers eingehalten werden. Dabei ist zu berücksichtigen, dass die Gasströmung durch die Blasleitung zwischen einem Refiner und einem Trockner von vielen verschiedenen äußeren Parametern abhängig ist und so als unabhängiger Steuerparameter für den Betrieb eines statischen Mischers an dieser Stelle kaum zur Verfügung steht.It may be remembered that the mixing of the binder with the fibers, i. increase the distribution of the binder on the fibers through a static mixer in the blowpipe between the refiner and the dryer. However, there is the danger of a buildup of glued fibers on the mixing tools, if no optimal operating conditions of the static mixer are maintained. It should be noted that the gas flow through the blowpipe between a refiner and a dryer depends on many different external parameters and thus is hardly available as an independent control parameter for the operation of a static mixer at this point.

Die DE 197 40 676 C2 offenbart einen Turm als statischen Mischer für das Vermischen von Fasern und Bindemittel in einer seitlich begrenzten Strömung, in dem oder an dessen Wand Mittel zum Verwirbeln der Fasern angeordnet sind, die als Leitbleche, Schikanen oder dergleichen und verstellbar ausgebildet sein können. Zur Art und Weise der Verstellbarkeit solcher Mittel zum Verwirbeln der Fasern ist hier aber nichts ausgeführt.DE 197 40 676 C2 discloses a tower as a static mixer for mixing fibers and binder in a laterally limited flow, in which or on the wall means for vortexing the fibers are arranged, which are designed as baffles, baffles or the like and adjustable can. The manner of adjustability of such means for entangling the fibers but nothing is carried out here.

Die DE 101 39 128 A1 offenbart ein Verfahren und eine Vorrichtung zum Vakuumimprägnieren von kleinteiligem Material in einer evakuierbaren Imprägnierkammer, die beispielsweise als drehbare Trommel mit verstellbaren Schaufeln zum Durchmischen des Materials und des Imprägniermittels ausgebildet sein kann. Weiterhin sind Mess- und Regelkreise vorgesehen, mit denen beispielsweise der Druck oder die Druckänderung in der Imprägnierkammer überwacht und der jeweilige Messwert dazu verwendet wird, die Drehzahl einer Eintrags- und Austragsschnecke in Abhängigkeit von der aufgegebenen Material- und Imprägniermenge so zu verändern, dass eine größtmögliche Vakuumabdichtung gewährleistet wirdDE 101 39 128 A1 discloses a method and a device for vacuum impregnation of small-particle material in an evacuatable impregnation chamber, which can be designed for example as a rotatable drum with adjustable blades for mixing the material and the impregnating agent. Furthermore, measuring and Control circuits provided with which, for example, monitors the pressure or the pressure change in the impregnation and the respective measurement is used to change the speed of a feed and discharge screw depending on the discontinued material and impregnation so that a maximum vacuum seal is guaranteed

In der DE 197 52 005 A1 geht es darum, die Einmündung eines Dosierkanals für pulverförmiges Material in eine seitlich begrenzte Strömung dann zu verschließen, wenn die Gefahr besteht, dass die Strömung in den Dosierkanal eintritt, weil der Unterdruck im Mischbereich einen vorgegebenen Wert unterschreitet.In DE 197 52 005 A1 it is important to then close the junction of a metering channel for powdery material in a laterally limited flow, if there is a risk that the flow enters the metering, because the negative pressure in the mixing range falls below a predetermined value.

Die DE 196 17 384 A1 betrifft eine Anordnung und ein Verfahren zur Regelung des Mischungaverhattniseee zweier Gasvolumenströme durch eine Venturi-Düse über deren Düsennadel. Dabei geht es um eine derartige Steuerung, dass das vorgebbare Mischungsverhältnis der beiden Gasvolumenströme eingehalten wird.DE 196 17 384 A1 relates to an arrangement and a method for controlling the mixture of two gas volume flows through a Venturi nozzle via its nozzle needle. It is about such a control that the predetermined mixing ratio of the two gas flow rates is maintained.

Die DE 40 39 903 A1 betrifft eine Vorrichtung sowie ein Verfahren zur Mischung von Dampf mit Wasser. Dabei wird eine gefahrlose Betriebsweise dadurch erreicht, dass man in einem mit Wasser beaufschlagten Wasserrohr einen Ringspalt verkleinert, bis ein Differenzdruck über den Ringspalt einen bestimmten Wert erreicht. Durch den Ringspalt strömt nur das Wasser.DE 40 39 903 A1 relates to a device and a method for mixing steam with water. In this case, a safe operation is achieved by reducing an annular gap in a water pipe acted upon with water until a differential pressure across the annular gap reaches a certain value. Through the annular gap flows only the water.

AUFGABE DER ERFINDUNGOBJECT OF THE INVENTION

Der Erfindung liegt die Aufgabe zugrunde, ein verbessertes Mischverfahren der eingangs beschriebenen Art und einen statischen Mischer zu dessen Umsetzung aufzuzeigen, mit denen verschiedene Substanzen auch unter widrigen Randbedingungen kontrolliert mischbar sind.The invention has for its object to provide an improved mixing method of the type described above and a static mixer to implement it, with which various substances are controlled miscible even under adverse conditions.

LÖSUNGSOLUTION

Die Aufgabe der Erfindung wird erfindungsgemäß durch ein Mischverfahren mit den Merkmalen des Patentanspruchs 1 sowie einen statischen Mischer mit den Merkmalen des Patentanspruchs 8 gelöst.The object of the invention is achieved by a mixing method with the features of claim 1 and a static mixer with the features of claim 8.

BESCHREIBUNG DER ERFINDUNGDESCRIPTION OF THE INVENTION

Bei dem neuen Mischverfahren wird die von der Mischanordnung auf die miteinander zu vermischenden Substanzen aktuell ausgeübte Mischarbeit durch Verstellen der Mischwerkzeuge geregelt. Die Mischarbeit, dass heißt der Energieverbrauch beim Mischen, erweist sich als geeignetes Kriterium für das Erreichen einer hinreichenden Vermischung der zu vermischenden Substanzen. Dabei ist davon auszugehen, dass die Mischanordnung die einzelnen Anteile der Substanzen gleichmäßig erfasst. Um die Mischarbeit zu regeln, werden bei dem neuen Mischverfahren die Mischwerkzeuge der Mischanordnung verstellt, die zu diesem Zweck beispielsweise mit Stellaktuatoren verbunden sind. Die Mischarbeit von Mischwerkzeugen kann beispielsweise dadurch verändert werden, dass sie weiter in die seitlich begrenzte Strömung hinein oder aus dieser heraus bewegt oder innerhalb der Strömung verdreht werden, wodurch sich jeweils der freie Querschnitt und/oder der Verlauf des freien Querschnitts der Strömung verändert. Typischerweise entspricht dabei ein kleiner werdender freier Querschnitt der Strömung einer größer werdenden Mischarbeit und umgekehrt.In the new mixing method, the mixing work currently performed by the mixing device on the substances to be mixed together is controlled by adjusting the mixing tools. The mixing work, that is, the energy consumption during mixing, proves to be a suitable criterion for achieving a sufficient mixing of the substances to be mixed. It can be assumed that the mixing arrangement detects the individual components of the substances uniformly. In order to regulate the mixing work, the mixing tools of the mixing arrangement are adjusted in the new mixing method, which are connected for this purpose, for example with adjusting actuators. The mixing work of mixing tools can be changed, for example, by moving them further into or out of the laterally limited flow, whereby the free cross section and / or the course of the free cross section of the flow changes in each case. Typically, a decreasing free cross-section of the flow corresponds to an increasing mixing work and vice versa.

Als Maß für die von der Mischanordnung auf die miteinander zu vermischenden Substanzen aktuell ausgeübte Mischarbeit kann mindestens ein Druck in der Strömung ermittelt werden. Bevorzugt wird das neue Mischverfahren anhand eines Druckabfalls in der Strömung über der Mischanordnung überwacht. Dieser Druckabfall ist ein direktes Maß für die Mischarbeit, die von dem Mischverfahren geleistet wird. Wenn sich ein Druckabfall in einer bestimmten Größe ergibt, bedeutet dies, dass von dem Mischverfahren eine bestimmte Mischarbeit pro Volumen der durch die Mischanordnung hindurchgeführten Strömung geleistet wurde.As a measure of the mixing work currently being performed by the mixing arrangement on the substances to be mixed together, at least one pressure in the flow can be determined. Preferably, the new mixing method is monitored by a pressure drop in the flow over the mixing assembly. This pressure drop is a direct measure of the mixing work done by the mixing process. When a pressure drop of a certain magnitude results, it means that the mixing process has performed a certain mixing work per volume of the flow passed through the mixing arrangement.

Zur Ermittlung des Druckabfalls über der Mischanordnung kann der Druck in der Strömung vor und nach der Mischanordnung gemessen werden. Der Druckabfall ist dann die Differenz dieser beiden Drücke.To determine the pressure drop across the mixing arrangement, the pressure in the flow before and after the mixing arrangement can be measured. The pressure drop is then the difference between these two pressures.

Um den Druckabfall unabhängig von anderen Parametern des Mischverfahrens konstant zu halten, kann bei einer über einen Grenzwert hinausgehenden Abweichung des Druckabfalls von einem vorgegebenen Sollwert mindestens ein Mischwerkzeug der Mischanordnung verstellt werden, um den Druckabfall zu korrigieren. Die Mischanordnung wird damit beispielsweise an variierende äußere Parameter angepasst, um unabhängig hiervon immer dieselbe Mischarbeit pro Volumen der hindurchtretenden Strömung zu leisten.In order to keep the pressure drop constant independently of other parameters of the mixing process, at least one mixing tool of the mixing arrangement can be adjusted to correct the pressure drop at a deviation of the pressure drop from a predetermined setpoint value beyond a limit value. The mixing arrangement is thus adapted, for example, to varying external parameters, in order to independently always carry out the same mixing work per volume of the passing flow.

Besonders bevorzugt sind Anwendungen des neuen Mischverfahrens, bei denen eine flüssige Substanz und eine teilchenförmige feste Substanz, auf der die flüssige Substanz zu verteilen ist, von einer Gasströmung durch die Mischanordnung hindurchgeführt werden. Grundsätzlich kann die Strömung aber auch eine Flüssigkeitsströmung sein und es können beispielsweise auch zwei teilchenförmige feste Substanzen miteinander vermischt werden. Überdies kann eine der miteinander zu vermischenden Substanzen auch die Strömung ganz oder teilweise ausbilden. Es können auch mehrere gasförmige Substanzen durch das neue Mischverfahren miteinander vermischt werden.Particular preference is given to applications of the novel mixing method in which a liquid substance and a particulate solid substance on which the liquid substance is to be distributed are guided by a gas flow through the mixing arrangement. In principle, however, the flow may also be a liquid flow and, for example, two particulate solid substances may also be mixed with one another. Moreover, one of the substances to be mixed with each other can also form the flow completely or partially. It is also possible to mix several gaseous substances together by the new mixing method.

Besonders bevorzugt ist es jedoch, wenn es sich bei den miteinander zu vermischenden Substanzen um ein flüssiges Bindemittel handelt, das auf lignocellulosehaltigen Fasern gleichmäßig zu verteilen ist.However, it is particularly preferred if the substances to be mixed together are a liquid binder which is to be distributed uniformly on lignocellulose-containing fibers.

Das neue Mischverfahren ist dazu geeignet, bei der Beleimung in einer Blasleitung eingesetzt zu werden, bei der das Bindemittel auf die feucht aus einem Refiner austretenden lignocelluslosehaltigen Fasern verteilt wird.The new mixing method is suitable for use in gluing in a blowpipe, in which the binder is distributed over the moist lignocellus-containing fibers emerging from a refiner.

Der neue statische Mischer zeichnet sich dadurch aus, dass die Mischwerkzeuge verstellbar sind, um die von der Mischanordnung auf die miteinander zu vermischenden Substanzen aktuell ausgeübte Mischarbeit zu regeln.The new static mixer is characterized in that the mixing tools are adjustable in order to control the mixing work currently being performed by the mixing arrangement on the substances to be mixed together.

Zur Bestimmung eines Maßes für die von der Mischanordnung auf die miteinander zu vermischenden Substanzen aktuell ausgeübte Mischarbeit kann der neue Mischer eine Messeinrichtung für mindestens einen Druck in dem Strömungskanal aufweisen.To determine a measure of the mixing work currently being performed by the mixing arrangement on the substances to be mixed with each other, the new mixer can have a measuring device for at least one pressure in the flow channel.

Bevorzugt ist eine Messeinrichtung für einen Druckabfall in dem Strömungskanal über der Mischanordnung vorgesehen. Typischerweise umfasst die Messeinrichtung dabei jeweils eine Drucksonde vor und hinter der Mischanordnung in dem Strömungskanal.Preferably, a measuring device is provided for a pressure drop in the flow channel above the mixing arrangement. Typically, the measuring device in each case comprises a pressure probe in front of and behind the mixing arrangement in the flow channel.

Die Mischanordnung des neuen Mischers umfasst in ihrer bevorzugten Ausführungsformen mindestens ein derart verstellbares Mischwerkzeug, dass der Druckabfall einer Strömung in dem Strömungskanal über der Mischanordnung veränderbar ist.In its preferred embodiments, the mixing arrangement of the new mixer comprises at least one mixing tool that can be adjusted such that the pressure drop of a flow in the flow channel above the mixing arrangement is variable.

Für die Verstellung dieses Mischwerkzeugs kann eine Steuereinrichtung vorgesehen sein, die als Eingangssignal den Druckabfall über der Mischanordnung verwendet, und die bei einer über einen Grenzwert hinausgehenden Abweichung des Druckabfalls von einem vorgegebenen Sollwert das Mischwerkzeug verstellt. Die Mischanordnung kann auch mehrere verstellbare Werkzeuge aufweisen, die von der Steuereinrichtung betätigt werden.For the adjustment of this mixing tool, a control device may be provided which uses the pressure drop across the mixing arrangement as input signal, and at an exceeding of a limit deviation of the pressure drop from a predetermined setpoint adjusts the mixing tool. The mixing assembly may also include a plurality of adjustable tools that are actuated by the control device.

In einer besonders interessierenden konkreten Ausführungsform weist der Strömungskanal des neuen Mischers einen Einlass für eine eine teilchenförmige feste Substanz fördernde Gasströmung und eine Einsprühdüse für eine auf der teilchenförmigen feste Substanz zu verteilende flüssige Substanz auf. Dabei kann der Mischer in einer Blasleitung zwischen einem feuchte lignocelluloshaltige Fasern abgebenden Refiner und einem Trockner für die Fasern angeordnet sein. Die Einsprühdüse für die flüssige Substanz kann innerhalb des Mischers stromauf der Mischanordnung, innerhalb der Mischanordnung und in bestimmten Fällen sogar stromab der Mischanordnung angeordnet sein. Eine Lage der Einsprühdüse stromab der Mischanordnung kommt dann in Frage, wenn die mit der Mischanordnung in der Strömung induzierte Verwirbelung der teilchenförmigen festen Substanz für eine Verteilung der erst anschließend aufgesprühten flüssigen Substanz ausreichend ist. Bei einer Anordnung der Einsprühdüse innerhalb der Mischanordnung kann die Einsprühdüse auch im unmittelbaren Bereich eines einzelnen Mischwerkzeugs in den Strömungskanal einmünden. Ganz allgemein kann nicht nur eine einzige Einsprühdüse vorgesehen sein. Vielmehr können sowohl einzelne Einsprühdüsen an mehreren unterschiedlichen Orten als auch mehrere Einsprühdüsen an einem oder mehreren Orten des Mischers vorgesehen sein.In a particular embodiment of interest, the flow passage of the new mixer has an inlet for a particulate solid substance-promoting gas flow and a spray nozzle for a liquid substance to be distributed on the particulate solid substance. In this case, the mixer can be arranged in a blowing line between a moist lignocelluloshaltige fibers emitting refiner and a dryer for the fibers. The liquid substance injector nozzle may be disposed within the mixer upstream of the mixing assembly, within the mixing assembly and, in certain instances, even downstream of the mixing assembly. A position of the injection nozzle downstream of the mixing arrangement may be considered if the turbulence of the particulate solid substance induced by the mixing arrangement in the flow is sufficient for a distribution of the subsequently sprayed-on liquid substance. With an arrangement of the injection nozzle within the mixing arrangement, the injection nozzle can also open into the flow channel in the immediate area of a single mixing tool. In general, not only a single injection nozzle can be provided. Rather, both individual injection nozzles can be provided at several different locations as well as a plurality of injection nozzles at one or more locations of the mixer.

KURZBESCHREIBUNG DER FIGURENBRIEF DESCRIPTION OF THE FIGURES

Im Folgenden wird die Erfindung anhand eines in den Figuren dargestellten bevorzugten Ausführungsbeispiel des neuen statischen Mischers weiter erläutert und beschrieben.

Fig. 1
zeigt einen Längsschnitt durch eine Ausführungsform des neuen statischen Mischers.
In the following, the invention will be further explained and described with reference to a preferred embodiment of the new static mixer shown in the figures.
Fig. 1
shows a longitudinal section through an embodiment of the new static mixer.

FIGURENBESCHREIBUNGDESCRIPTION OF THE FIGURES

Der in Fig. 1 im Längsschnitt dargestellte statische Mischer 1 weist einen seitlich begrenzten Strömungskanal 2 auf, der sich zwischen zwei Anschlussflanschen 3 und 4 erstreckt. Die Öffnung des Strömungskanals 2 an dem Anschlussflansch 3 bildet einen Einlass 5 für eine Gasströmung 6 aus, die eine teilchenförmige feste Substanz, beispielsweise lignocellulosehaltige Faser, durch den Strömungskanal 2 hindurchfördert, bis sie an einem Auslass 7 wieder aus dem statischen Mischer 1 heraustritt, der von einer Öffnung des Strömungskanals 2 an dem Einschlussflansch 4 gebildet wird. Zusätzlich weist der statische Mischer 1 einen Anschlussflansch 8 auf, an dem eine hier nicht dargestellte Einsprühdüse so befestigt werden kann, dass mit ihr ein flüssige Substanz 9, beispielsweise ein flüssiges Bindemittel, auf die von der Gasströmung 6 geförderte teilchenförmige feste Substanz seitlich aufgesprüht werden kann. Um dabei eine besonders gleichmäßige Verteilung der flüssigen Substanz 9 auf der von der Gasströmung 6 geführten teilchenförmigen festen Substanz zu erreichen, ist in dem Strömungskanal 2 eine Mischanordnung 10 mit mehreren Mischwerkzeugen 11 bis 16 vorgesehen. Die Mischwerkzeuge 11 bis 16 verwirbeln die durch die Mischanordnung 10 hindurchgeführte Gasströmung 6, so dass sich die von der Gasströmung geführten Substanzen innig miteinander vermischen. Dies ist bei der gewünschten Verteilung der flüssigen Substanz 9 auf der teilchenförmigen festen Substanz mit einer besonders gleichmäßigen Verteilung gleichbedeutend. Bei den Mischwerkzeugen 11 bis 16 handelt es sich in Fig. 1 beispielhaft um solche 11 bis 13, die eine lokale Verengung des Querschnitts des Strömungskanals 2 von außen bewirken, und solche 14 bis 16, die mittig in dem Strömungskanal 2 angeordnet sind. Neben den Mischwerkzeugen 11 bis 16 wird der Strömungskanal 2 ausschließlich durch ein zylindrisches Rohr 17 begrenzt, das sich zwischen den Anschlussflanschen 3 und 4 erstreckt. Die von der Mischanordnung 10 auf die Gasströmung 6 ausgeübte Mischarbeit bewirkt einen Druckabfall in der Gasströmung 6 über der Mischanordnung 10. Dieser Druckabfall wird mit Drucksonden 18 und 19 gemessen, die den Druck der Gasströmung 6 vor und hinter der Mischanordnung 10 erfassen. Die Messsignale 20 und 21 der Drucksonden 18 und 19 sind die Eingangssignale einer Überwachungs- und Steuereinrichtung 22, die den Betrieb des statischen Mischers 1 überwacht. Wenn der anhand der Messsignale 20 und 21 festgestellte Druckabfall über der Mischanordnung 10 von einem vorgegebenen Sollwert über ein vorgegebenes Maß hinaus abweicht, sendet die Überwachungs- und Steuereinrichtung 22 Ansteuersignale 23 bis 28 an die Mischwerkzeuge 11 bis 16 aus, wodurch die Mischwerkzeuge 11 bis 16 so verstellt werden, dass sie je nach Bedarf den Druckabfall über der Mischanordnung 10 erhöhen oder absenken. Hierzu werden beispielsweise die Mischwerkzeuge 11 bis 13 weiter aufeinander zu oder weiter voneinander weg bewegt und die Mischwerkzeuge 14 bis 16 innerhalb des Strömungskanals 2 verschwenkt, was jeweils durch Doppelpfeile angedeutet ist. So wird bei dem statischen Mischer 1 auch bei variierenden Parametern der Gasströmung 6 die jeweils pro Volumen der Gasströmung verrichtete Mischarbeit möglichst konstant gehalten, so dass das Mischungsergebnis, beispielsweise konkret die Verteilung eines flüssigen Bindemittels auf lignocellulosehaltigen Fasern möglichst gleichmäßig ist.The static mixer 1 shown in longitudinal section in FIG. 1 has a laterally limited flow channel 2 which extends between two connecting flanges 3 and 4. The opening of the flow channel 2 at the connection flange 3 forms an inlet 5 for a Gas flow from 6, which conveys a particulate solid substance, such as lignocellulosic fiber through the flow channel 2 until it emerges at an outlet 7 again from the static mixer 1, which is formed by an opening of the flow channel 2 at the containment flange 4. In addition, the static mixer 1 has a connection flange 8, on which a Einsprühdüse not shown here can be fixed so that with her a liquid substance 9, such as a liquid binder, can be sprayed on the side of the gas flow 6 promoted particulate solid substance , In order to achieve a particularly uniform distribution of the liquid substance 9 on the guided from the gas flow 6 particulate solid substance, a mixing assembly 10 is provided with a plurality of mixing tools 11 to 16 in the flow channel 2. The mixing tools 11 to 16 fluidize the gas flow 6 passed through the mixing arrangement 10, so that the substances guided by the gas flow intimately mix with one another. This is synonymous with the desired distribution of the liquid substance 9 on the particulate solid substance with a particularly uniform distribution. By way of example, the mixing tools 11 to 16 in FIG. 1 are those 11 to 13, which bring about a local constriction of the cross section of the flow channel 2 from the outside, and those 14 to 16, which are arranged centrally in the flow channel 2. In addition to the mixing tools 11 to 16, the flow channel 2 is limited exclusively by a cylindrical tube 17 which extends between the connecting flanges 3 and 4. The mixing work performed by the mixing assembly 10 on the gas flow 6 causes a pressure drop in the gas flow 6 over the mixing assembly 10. This pressure drop is measured with pressure probes 18 and 19 which detect the pressure of the gas flow 6 in front of and behind the mixing assembly 10. The measuring signals 20 and 21 of the pressure probes 18 and 19 are the input signals of a monitoring and control device 22, which monitors the operation of the static mixer 1. If the pressure drop across the mixing arrangement 10, which has been determined based on the measurement signals 20 and 21, deviates from a predefined setpoint value beyond a predefined amount, the monitoring and control device 22 sends activation signals 23 to 28 to the mixing tools 11 to 16, as a result of which the mixing tools 11 to 16 be adjusted so that they increase or decrease the pressure drop across the mixing assembly 10 as needed. For this purpose, for example, the mixing tools 11 to 13 further moved towards each other or further away from each other and the mixing tools 14 to 16 pivoted within the flow channel 2, which is indicated by double arrows. Thus, in the static mixer 1, even with varying parameters of the gas flow 6 each Mixed work done per volume of the gas flow kept as constant as possible, so that the mixing result, for example, the distribution of a liquid binder on lignocellulose-containing fibers is as uniform as possible.

BEZUGSZEICHENLISTELIST OF REFERENCE NUMBERS

11
Mischermixer
22
Strömungskanalflow channel
33
Anschlussflanschflange
44
Anschlussflanschflange
55
Einlassinlet
66
Gasströmunggas flow
77
Auslassoutlet
88th
Anschlussflanschflange
99
Substanzsubstance
1010
Mischanordnungmixing arrangement
2121
Messsignalmeasuring signal
2222
Überwachungs- und
SteuereinrichtungSurveillance and
control device
2323
Ansteuersignalcontrol signal
2424
Ansteuersignalcontrol signal
2525
Ansteuersignalcontrol signal
2626
Ansteuersignalcontrol signal
2727
Ansteuersignalcontrol signal
2828
Ansteuersignalcontrol signal
1111
Mischwerkzeugmixing tool
1212
Mischwerkzeugmixing tool
1313
Mischwerkzeugmixing tool
1414
Mischwerkzeugmixing tool
1515
Mischwerkzeugmixing tool
1616
Mischwerkzeugmixing tool
1717
Rohrpipe
1818
Drucksondepressure probe
1919
Drucksondepressure probe
2020
Messsignalmeasuring signal

Claims (14)

  1. Mixing method, wherein substances to be mixed with each other are guided through a mixing arrangement (10), which comprises at least one adjustable static mixing tool (11 to 16), in a laterally delimited flow, wherein the mixing labour presently exerted by the mixing arrangement (10) on the substances to be mixed which each other is adjustable by adjusting the mixing tools (11 to 16), characterized in that at least one pressure in the flow is determined as a measure for the mixing labour actually exerted by the mixing arrangement (19) on the substances to be mixing with each other, and that the mixing labour actually exerted by the mixing arrangement (10) on the substances to be mixed with each other is controlled by adjusting the mixing tools (11 to 16).
  2. Mixing method according to claim 1, characterized in that a pressure drop in the flow over the mixing arrangement (10) is determined, and that the mixing method is monitored based on the pressure drop.
  3. Mixing method according to claim 2, characterized in that the pressure in the flow is measured in front of and behind the mixing arrangement (10) for determining the pressure drop.
  4. Mixing method according to claim 2 or 3, characterized in that at least one mixing tool (11 to 16) of the mixing arrangement (10) is adjusted to correct the pressure drop upon a deviation of the pressure drop from a predetermined set value exceeding a threshold value.
  5. Mixing method according to any of the claims 1 to 4, characterized in that a liquid substance (9) and a particulate solid substance on which the liquid substance is to be distributed are guided with a gas flow (8) through the mixing arrangement (10).
  6. Mixing method according to claim 5, characterized in that the liquid substance (9) is a binder and the particulate solid substance consists of lingo-cellulose containing fibres.
  7. Mixing method according to claim 6, characterized in that the binder is distributed over the lingo-cellulose containing fibres emerging out of a refiner in a wet state.
  8. Static mixer for mixing substances in a laterally delimited flow to carry out the mixing method according to any of the claims 1 to 7, the mixer having a laterally delimited flow channel (2), in which a mixing arrangement (10) comprising at least one adjustable static mixing tool (11 to 16) is arranged, wherein the mixing labour presently exerted by the mixing arrangement (10) on the substances to be mixed with each other is adjustable by adjusting the mixing tools (11 to 16), characterized in that a measurement device is provided for at least one pressure in the flow channel (2) as a measure for the mixing labour presently exerted by the mixing arrangement (10) on the substances to be mixed with each other, and that a control device (22) is designed in such a way that it adjusts the mixing tools (11 to 16) to control the mixing labour actually exerted by the mixing arrangement (10) on the substances to be mixed with each other.
  9. Mixer according to claim 8, characterized in that a measurement device for a pressure drop in the flow channel (2) over the mixing arrangement (10) is provided.
  10. Mixer according to claim 9, characterized in that the measurement device comprises a pressure probe (18, 19) in front of and behind the mixing arrangement (10) in the flow channel (2).
  11. Mixer according to claim 9 or 10, characterized in that at least one mixing tool (11 to 16) of the mixing arrangement (10) is adjustable in such a way that the pressure drop of a flow in the flow channel (2) over the mixing arrangement (10) is changed.
  12. Mixer according to claim 11, characterized in that the control device (22) adjusts at least one mixing tool (11 to 16) of the mixing arrangement (10) upon a deviation of the pressure drop from a predetermined set value exceeding a threshold value.
  13. Mixer according to any of the claims 8 to 12, characterized in that the flow channel (2) comprises an inlet (5) for a gas flow (6) conveying a particulate solid substance and an injection nozzle for a liquid substance (9) to be distributed over the particulate solid substance.
  14. Mixer according to claim 13, characterized in that it is arranged in a blow line between a refiner supplying wet lingo-cellulose containing fibres and a dryer for the fibres.
EP04019796A 2003-09-11 2004-08-20 Process and apparatus for static mixing, especially for the glueing of lignocellulosic fibers using a binder Expired - Lifetime EP1514592B1 (en)

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DE10341960A DE10341960B4 (en) 2003-09-11 2003-09-11 Mixing method and static mixer, in particular for gluing lignocellulose-containing fibers with a binder

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DE502004003109D1 (en) 2007-04-19
DE10341960B4 (en) 2008-02-07

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