EP0357919A1 - Wetting screw and method for cleaning same - Google Patents

Wetting screw and method for cleaning same Download PDF

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Publication number
EP0357919A1
EP0357919A1 EP89113212A EP89113212A EP0357919A1 EP 0357919 A1 EP0357919 A1 EP 0357919A1 EP 89113212 A EP89113212 A EP 89113212A EP 89113212 A EP89113212 A EP 89113212A EP 0357919 A1 EP0357919 A1 EP 0357919A1
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EP
European Patent Office
Prior art keywords
nozzles
moistening
shaft
paddles
screw according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89113212A
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German (de)
French (fr)
Inventor
Hermann Dr.-Ing. Möller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Johannes Moeller Hamburg GmbH and Co KG
Original Assignee
Johannes Moeller Hamburg GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Johannes Moeller Hamburg GmbH and Co KG filed Critical Johannes Moeller Hamburg GmbH and Co KG
Publication of EP0357919A1 publication Critical patent/EP0357919A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B01F23/565—Mixing liquids with solids by introducing liquids in solid material, e.g. to obtain slurries
    • 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
    • B01F27/62—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis comprising liquid feeding, e.g. spraying means
    • 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
    • B01F35/10—Maintenance of mixers
    • B01F35/145—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means
    • B01F35/1452—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means using fluids
    • B01F35/1453—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means using fluids by means of jets of fluid, e.g. air
    • 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
    • B01F35/7179—Feed mechanisms characterised by the means for feeding the components to the mixer using sprayers, nozzles or jets
    • 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
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • 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
    • B01F27/2322—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 with parallel axes
    • 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

Definitions

  • the invention relates to a moistening screw with wing-like paddles which are arranged on at least one shaft which is located in a housing which is provided with an inlet and an outlet for dusty materials, and with nozzles for the addition of water.
  • Moisturizing screws which are generally also referred to as so-called paddle screws, are used to put dust-like materials, especially ashes from coal-fired power plants or from waste incineration plants, in an earth-moist state, so that the ashes lose their dust or powder properties, which they have after loading Moisture due to chemical reactions generally does not return.
  • the object of the invention is to provide a moistening screw and a method for cleaning it, by which formation of incrustations on the paddle and the shaft is prevented during operation, so that the need for repeated decommissioning of the machine is eliminated.
  • the invention provides that the moistening screw is provided with high-pressure nozzles which are arranged one behind the other in the direction of the shaft and with which a proportion of the moistening water under a pressure of more than 20 bar, in particular 30 to 50 bar, to be sprayed onto the back of the paddles.
  • the formation of incrustations on the paddles and the shaft can be prevented from the outset, taking advantage of the ash to be added anyway for the moistening, or can be eliminated continuously during operation, so that business interruptions for the purpose of subsequent cleaning of the paddles and the Wave can be avoided.
  • Two types of high-pressure nozzles can be used together or alternatively.
  • nozzles that emit a fan-shaped jet for a relatively easy removal of deposits has proven to be suitable.
  • These nozzles are preferably arranged in such a way that they direct the fan-shaped water jet tangentially to the waves Release surface as well as diagonally or almost tangentially on the back of the paddle, which, in contrast to the front, is more exposed to the risk of build-ups or incrustations.
  • the rear side means the side that is at the back in the conveying direction.
  • nozzles can be arranged in the same number of paddles, so that each paddle is assigned a nozzle with which the shaft in the region of this paddle is preferably to be kept clean.
  • high-pressure nozzles can be provided which emit a sharply focused, aligned jet, preferably tangentially to the shaft and, if appropriate, additionally also to the rear of a paddle or also several paddles.
  • these high-pressure nozzles can be mounted so that they can be moved or pivoted, so that through their Swiveling movement creates a larger area of influence.
  • the pivotable nozzles can be coupled to one another and pivoted back and forth together at predetermined time intervals in the direction of the shaft axis. Through such a swiveling movement, the sharply focused or concentrated jets act in the same planes as the fan-shaped jets of the aforementioned nozzles.
  • the movement of the pivotable nozzles can be delayed with respect to each individual rotation of the shaft, so that the individual jet does not spray the same area of the surface with each rotation of the shaft, but rather less in the course Revolutions of the shaft cleans its entire surface.
  • the individual nozzles can be supplied with water one after the other via solenoid valves.
  • the moistening screw shown in FIGS. 1 and 2 has a housing 1, in which two axially parallel shafts 2 and 3 are arranged, which are coupled to one another by a gear 4 in such a way that they rotate in opposite directions to one another in accordance with arrows 5 and 6.
  • the two shafts 2 and 3 each carry wing-like paddles 7 and 7 ', four of which form a worm gear arranged radially to a shaft and axially at a distance.
  • An inlet 8 for the addition of mixed material or ashes is arranged on the upper side of the housing and an outlet 9 at the other end on the underside of the housing.
  • the inlet 8 and the outlet 9 have a width which corresponds to the distance between the two shafts 2 and 3 , as can be seen in Figure 2.
  • two rows of nozzles 13 and 14 are provided with which a fan-shaped jet 15 is to be emitted.
  • This fan-shaped beam 15 is aligned such that it the two waves 2 and 3 on their in Pages on rising sides affected. On the one hand, this achieves the highest effect in terms of cleaning the shaft surface.
  • the jet hits the mix in an area where it is relatively high in the container, so that there is no risk of damage to the housing or the housing wall due to the high water pressure.
  • the supply of the individual nozzles of the two rows 13 and 14 takes place via manifolds 17 and 18 using solenoid valves 19.
  • water is preferably supplied to the nozzles one after the other, that is to say successively during one revolution of the shaft.
  • the solenoid valves 19 can be opened in an optimal sequence and time period to be determined for each specific dust material, taking into account that these water components together with the water that is supplied via the nozzle 11, also serves to adequately moisten the ash.
  • FIGS. 3 to 5 differs from the one described above essentially by the use of pivotable nozzles 20 which are suitable for the delivery of a sharply bundled, concentrated water jet 22 under high pressure, preferably 30 to 50 bar. It can be seen from FIG. 4 that these water jets 22 are again directed tangentially to the shafts 2 and 3. As a result of the pivoting movement of the nozzles 20, however, fan-shaped jets can again be produced, the fan not forming at the same time, but the water standing in the area of a fan being at a considerably higher pressure than in the embodiment according to FIGS. 1 and 2.
  • the nozzles 20 are coupled to one another by a rod 23, which is connected to a motor 24, through which the rod 23 is to be moved back and forth in accordance with the double arrow 25, so that the individual nozzles 20, which are connected to the main line 17 via hoses 26, can rotate about their axis 28, whereby they rotate in a slot 29 in the housing 1 and move around.
  • the number of nozzles is smaller than in the embodiment according to FIG. 1, since a nozzle 20 covers a larger area due to its pivotability.
  • the pivoting movement of the nozzles 20 does not take place synchronously with the rotation of the shafts 2 and 3, but preferably with a slight delay from one rotation to a further rotation, so that all areas of the shaft surface are cleaned of any deposits in the course of several shaft rotations.
  • the individual nozzles 20 can also be supplied with water one after the other via magnetic valves.
  • each nozzle is effective in the area of several paddles, it preferably works continuously during several revolutions of a shaft.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Abstract

The invention relates to a wetting screw, by means of which dusty materials such as ashes from coal-fired power stations can be converted into a soil-moist state. For this purpose, the wetting screw has wing-type paddles arranged on a shaft which is located in a housing. The water is added through nozzles (11, 20). To prevent fouling and incrustation on the paddles and the shaft during operation, it is envisaged to design the nozzles (11, 20) as high-pressure nozzles, by means of which a part of the wetting water is to be sprayed onto the rear of the paddles (7) and onto the shaft (2, 3), it being possible for a fanned jet to be emitted which is to be directed approximately tangentially to the rear of the paddles (7) and to the shaft (2, 3). <IMAGE>

Description

Gegenstand der Erfindung bildet eine Anfeucht­schnecke mit flügelartigen Paddeln, die auf mindestens einer Welle angeordnet sind, welche in einem Gehäuse liegt, das mit einem Einlauf und einem Auslauf für staubförmige Materialien versehen ist, sowie mit Düsen für die Zugabe von Wasser.The invention relates to a moistening screw with wing-like paddles which are arranged on at least one shaft which is located in a housing which is provided with an inlet and an outlet for dusty materials, and with nozzles for the addition of water.

Anfeuchtschnecken, die allgemein auch als soge­nannte Paddelschnecken bezeichnet werden, finden Anwendung, um staubförmige Materialien, insbeson­dere Aschen aus Kohlekraftwerken oder aus Müll­verbrennungsanlagen in einen erdfeuchten Zustand zu versetzen, so daß die Asche ihre Staub- bzw. Pulvereigenschaft verliert, die sie nach der Be­ feuchtung infolge chemischer Reaktionen im allgemeinen auch nicht wieder annimmt.Moisturizing screws, which are generally also referred to as so-called paddle screws, are used to put dust-like materials, especially ashes from coal-fired power plants or from waste incineration plants, in an earth-moist state, so that the ashes lose their dust or powder properties, which they have after loading Moisture due to chemical reactions generally does not return.

Die Wirtschaftlichkeit aes Einsatzes derar­tiger Mischeinrichtungen wird jedoch beein­trächtigt durch einen erheblichen Aufwand für die regelmäßig notwendige Reinigung der Maschinen, die insbesondere notwendig sind, wenn die Aschen oder anderen staubförmigen Materialien sehr kleine Kornfraktionen ent­halten, welche mit dem zum Anfeuchten verwen­deten Wasser chemisch reagieren. Derartige Aschen führen nämlich zur Ausbildung von An­krustungen bzw. Ansätzen aus feuchtem Staub auf der Rückseite der einzelnen Paddel wie auch auf der Welle.However, the economic viability of using such mixing devices is impaired by a considerable outlay for the regularly necessary cleaning of the machines, which is particularly necessary if the ashes or other dusty materials contain very small grain fractions which react chemically with the water used for moistening. Such ashes namely lead to the formation of incrustations or deposits of moist dust on the back of the individual paddles as well as on the shaft.

Derartige Ansätze lassen sich bisher nur ent­fernen durch eine Unterbrechung des Betriebes der Anfeuchtschnecke. Die Notwendigkeit derar­tiger Betriebsunterbrechungen hat sich in jüngerer Zeit noch vermehrt durch den Anfall von Aschen besonders feiner bzw. kleiner Kör­nung in Kohlekraftwerken infolge des Einsatzes verbesserter Elektrofilter zum Zwecke des Um­weltschutzes sowie durch das Einblasen von Kalk zum Zwecke der Bindung von Schwefel, das zu höheren Anteilen von Kalzium-Schwefelverbin­dungen wie Kalziumsulfid und Kalziumsulfat in der Asche führt.Such approaches have so far only been able to be removed by interrupting the operation of the moistening screw. The need for such business interruptions has recently increased due to the attack of ashes of particularly fine or small grain in coal-fired power plants due to the use of improved electrostatic filters for the purpose of environmental protection and by blowing in lime for the purpose of binding sulfur, which leads to higher proportions of calcium-sulfur compounds such as calcium sulfide and calcium sulfate in the ash.

Aufgabe der Erfindung ist es, eine Anfeucht­schnecke und ein Verfahren ihrer Reinigung zu schaffen, durch die eine Ausbildung von An­krustungen an dem Paddel und der Welle während des Betriebes verhindert wird, so daß die Not­wendigkeit der wiederholten Außerbetriebsetzung der Maschine entfällt.The object of the invention is to provide a moistening screw and a method for cleaning it, by which formation of incrustations on the paddle and the shaft is prevented during operation, so that the need for repeated decommissioning of the machine is eliminated.

Zur Lösung der Aufgabe sieht die Erfindung vor, daß die Anfeuchtschnecke mit in Wellenrichtung hintereinander liegenden Hochdruckdüsen ver­sehen ist, mit denen ein Anteil des Anfeucht­ wassers unter einem Druck von mehr als 20 bar, insbesondere 30 bis 50 bar, auf die Rückseite der Paddel zu sprühen ist. Durch diese Anord­nung läßt sich die Ausbildung von Ankrustun gen an den Paddeln und der Welle unter Aus­nutzung des ohnehin der Asche für die Anfeuch­tung beizugebenden Wassers von vornherein ver­hindern bzw. während des Betriebes fortlaufend beseitigen, so daß Betriebsunterbrechungen zum Zwecke einer nachträglichen Reinigung der Paddel und der Welle vermieden werden.To achieve the object, the invention provides that the moistening screw is provided with high-pressure nozzles which are arranged one behind the other in the direction of the shaft and with which a proportion of the moistening water under a pressure of more than 20 bar, in particular 30 to 50 bar, to be sprayed onto the back of the paddles. With this arrangement, the formation of incrustations on the paddles and the shaft can be prevented from the outset, taking advantage of the ash to be added anyway for the moistening, or can be eliminated continuously during operation, so that business interruptions for the purpose of subsequent cleaning of the paddles and the Wave can be avoided.

Dazu können zwei Arten von Hochdruckdüsen ge­meinsam oder alternativ Verwendung finden.Two types of high-pressure nozzles can be used together or alternatively.

Zum einen hat sich die Verwendung von Düsen als geeignet gezeigt, die einen fächerförmigen Strahl abgeben für eine relativ leichte Entfernung von Ansätzen. Diese Düsen sind vorzugsweise fest­stehend derart angeordnet, daß sie den fächer­förmigen Wasserstrahl tangential an die Wellen­ oberfläche abgeben sowie schräg oder annähernd tangential auf die Rückseite der Paddel, die im Gegensatz zu der Vorderseite stärker der Gefahr der Ausbildung von Ansätzen bzw. An­krustungen ausgesetzt ist. Dabei ist unter Rück­seite diejenige Seite gemeint, die in Förderrich­tung hinten liegt.On the one hand, the use of nozzles that emit a fan-shaped jet for a relatively easy removal of deposits has proven to be suitable. These nozzles are preferably arranged in such a way that they direct the fan-shaped water jet tangentially to the waves Release surface as well as diagonally or almost tangentially on the back of the paddle, which, in contrast to the front, is more exposed to the risk of build-ups or incrustations. The rear side means the side that is at the back in the conveying direction.

Diese Düsen können in der gleichen Anzahl der Paddel angeordnet sein, so daß jedem Paddel eine Düse zugeordnet ist, mit der vorzugsweise auch die Welle im Bereich dieses Paddels sauberzuhal­ten ist.These nozzles can be arranged in the same number of paddles, so that each paddle is assigned a nozzle with which the shaft in the region of this paddle is preferably to be kept clean.

Daneben oder stattdessen können Hochdruckdüsen vorgesehen sein, die einen scharf gebündelten, ausgerichteten Strahl abgeben, und zwar vorzugs­weise tangential an die Welle und gegebenenfalls zusätzlich auch die Rückseite eines Paddels oder auch mehrerer Paddel. Diese Hochdruckdüsen kön­nen in Ausgestaltung der Erfindung beweglich bzw. schwenkbar gelagert sein, so daß durch ihre Schwenkbewegung ein größerer Einflußbereich ge­schaffen wird. Dazu können die schwenkbaren Dü­sen miteinander gekoppelt sein und in vorgege­benen Zeitintervallen gemeinsam in Richtung der Wellenachse hin und her geschwenkt werden. Durch eine solche Schwenkbewegung wirken die scharf gebündelten bzw. konzentrierten Strahlen in gleichen Ebenen wie die fächerförmigen Strahlen feststehender vorgenannter Düsen.In addition or instead, high-pressure nozzles can be provided which emit a sharply focused, aligned jet, preferably tangentially to the shaft and, if appropriate, additionally also to the rear of a paddle or also several paddles. In an embodiment of the invention, these high-pressure nozzles can be mounted so that they can be moved or pivoted, so that through their Swiveling movement creates a larger area of influence. For this purpose, the pivotable nozzles can be coupled to one another and pivoted back and forth together at predetermined time intervals in the direction of the shaft axis. Through such a swiveling movement, the sharply focused or concentrated jets act in the same planes as the fan-shaped jets of the aforementioned nozzles.

Um die gesamte Oberfläche der Welle tangential anzuströmen bzw. abzusprühen, läßt sich die Be­wegung der schwenkbaren Düsen gegenüber jeder einzelnen Umdrehung der Welle zeitlich verzö­gern, so daß der einzelne Strahl bei jeder Um­drehung der Welle nicht den gleichen Bereich der Oberfläche absprüht, sondern im Verlaufe weniger Umdrehungen der Welle deren gesamte Oberfläche reinigt. Auch bei dieser Anordnung lassen sich die einzelnen Düsen in zeitlicher Aufeinanderfolge nacheinander über Magnetventile mit Wasser versorgen.In order to flow or spray onto the entire surface of the shaft tangentially, the movement of the pivotable nozzles can be delayed with respect to each individual rotation of the shaft, so that the individual jet does not spray the same area of the surface with each rotation of the shaft, but rather less in the course Revolutions of the shaft cleans its entire surface. With this arrangement, too, the individual nozzles can be supplied with water one after the other via solenoid valves.

Weitere Merkmale der Erfindung bilden Gegen­stand der Ansprüche.Further features of the invention form the subject of the claims.

Zwei Ausführungsbeispiele der Erfindung sind nachstehend unter Bezugnahme auf eine Zeich­nung erläutert. In der Zeichnung zeigen:

  • Figur 1: eine Anfeuchtschnecke mit feststehen­den Düsen im Längsschnitt;
  • Figur 2: die Anordnung von Figur 1 im Schnitt nach der Linie I - I;
  • Figur 3: eine Anfeuchtschnecke mit schwenkba­ren Düsen im Längsschnitt;
  • Figur 4: die Anordnung nach Figur 3 im Schnitt nach der Linie IV - IV und
  • Figur 5: eine schwenkbare Düse im vergrößerten Maßstab.
Two embodiments of the invention are explained below with reference to a drawing. The drawing shows:
  • Figure 1: a moistening screw with fixed nozzles in longitudinal section;
  • Figure 2: the arrangement of Figure 1 in section along the line I - I;
  • Figure 3: a moistening screw with pivotable nozzles in longitudinal section;
  • Figure 4: the arrangement of Figure 3 in section along the line IV - IV and
  • Figure 5: a swiveling nozzle on an enlarged scale.

Die in den Figuren 1 und 2 dargestellte An­feuchtschnecke besitzt ein Gehäuse 1, in dem zwei achsparallel liegende Wellen 2 und 3 an­geordnet sind, die durch ein Getriebe 4 mit­einander derart gekoppelt sind, daß sie ent­sprechend den Pfeilen 5 und 6 gegensinnig zu­einander rotieren.The moistening screw shown in FIGS. 1 and 2 has a housing 1, in which two axially parallel shafts 2 and 3 are arranged, which are coupled to one another by a gear 4 in such a way that they rotate in opposite directions to one another in accordance with arrows 5 and 6.

Die beiden Wellen 2 und 3 tragen jeweils flü­gelartige Paddel 7 bzw. 7′, von denen jeweils vier radial zu einer Welle und achsial im Ab­stand angeordnet einen Schneckengang bilden.The two shafts 2 and 3 each carry wing-like paddles 7 and 7 ', four of which form a worm gear arranged radially to a shaft and axially at a distance.

Auf der Oberseite des Gehäuses ist ein Einlauf 8 für die Zugabe von Mischgut bzw. Asche angeord­net und anderenends an der Unterseite des Ge­häuses ein Auslauf 9. Der Einlauf 8 und der Auslauf 9 haben eine Breite, die dem Abstand der beiden Wellen 2 und 3 entspricht, wie der Figur 2 zu entnehmen ist.An inlet 8 for the addition of mixed material or ashes is arranged on the upper side of the housing and an outlet 9 at the other end on the underside of the housing. The inlet 8 and the outlet 9 have a width which corresponds to the distance between the two shafts 2 and 3 , as can be seen in Figure 2.

Hinter dem Einlauf 8 sind auf der Oberseite des Gehäuses 1 Düsen 11 für die Zugabe von Wasser angeordnet, mit denen die Asche während ihrer Förderung durch das Gehäuse 1 unter gleichzei­tiger Durchmischung anzufeuchten ist. Diese fortlaufende Durchmischung der Asche mit dem beigegebenen Wasser zur Anfeuchtung ergibt sich einerseits durch die vorgesehene Gegen­läufigkeit der Wellen 2 und 3 mit ihren Paddeln 7 und 7′, die beim Umlauf miteinander kämmen, so daß das Mischgut entsprechend der gestrichel­ten Linie in Figur 2 etwa in der Mitte des Ge­häuses 1 am höchsten angehoben und am stärksten durchmischt wird.Behind the inlet 8 are on the top of the Housing 1 nozzles 11 arranged for the addition of water, with which the ash is to be moistened while being conveyed through the housing 1 with simultaneous mixing. This continuous mixing of the ashes with the added water for moistening results on the one hand from the intended counter-rotation of the shafts 2 and 3 with their paddles 7 and 7 ', which mesh with each other during circulation, so that the mix according to the dashed line in Figure 2 approximately in the middle of the housing 1 is raised the highest and mixed the most.

Um die Ausbildung von Ankrustungen an den Rück­seiten der Paddel 7 bzw. der in Förderrichtung hinten liegenden Seiten der Paddel 7 sowie den Wellen 2 und 3 zu verhindern, sind zwei Reihen von Düsen 13 und 14 vorgesehen, mit denen ein fächerförmiger Strahl 15 abzugeben ist. Dieser fächerförmige Strahl 15 ist derart ausgerichtet, daß er die beiden Wellen 2 und 3 auf ihren im Umlauf ansteigenden Seiten tangiert. Dadurch wird einerseits die höchste Wirkung erreicht im Sinne einer Reinigung der Wellenoberfläche. Andererseits trifft der Strahl auf das Misch­gut in einem Bereich, in dem dieses verhält­nismäßig hoch im Behälter steht, so daß nicht die Gefahr einer Beschädigung des Gehäuses bzw. der Gehäusewandung durch den hohen Wasser­druck gegeben ist.In order to prevent the formation of incrustations on the rear sides of the paddles 7 or on the rear sides of the paddles 7 and the shafts 2 and 3, two rows of nozzles 13 and 14 are provided with which a fan-shaped jet 15 is to be emitted. This fan-shaped beam 15 is aligned such that it the two waves 2 and 3 on their in Pages on rising sides affected. On the one hand, this achieves the highest effect in terms of cleaning the shaft surface. On the other hand, the jet hits the mix in an area where it is relatively high in the container, so that there is no risk of damage to the housing or the housing wall due to the high water pressure.

Die Versorgung der einzelnen Düsen der beiden Reihen 13 und 14 erfolgt über Sammelleitungen 17 und 18 unter Ausnutzung von Magnetventilen 19. Dabei wird vorzugsweise den Düsen in För­derrichtung gesehen nacheinander d. h. aufein­anderfolgend während jeweils einer Wellenum­drehung Wasser zugeführt. Die Magnetventile 19 lassen sich dabei in einer für jedes spezifi­sche Staubgut zu ermittelnden optimalen Folge und Zeitdauer öffnen unter Berücksichtigung, daß diese Wasseranteile zusammen mit dem Wasser, das über die Düse 11 zugeführt wird, auch für eine ausreichende Anfeuchtung der Asche dient.The supply of the individual nozzles of the two rows 13 and 14 takes place via manifolds 17 and 18 using solenoid valves 19. In this case, water is preferably supplied to the nozzles one after the other, that is to say successively during one revolution of the shaft. The solenoid valves 19 can be opened in an optimal sequence and time period to be determined for each specific dust material, taking into account that these water components together with the water that is supplied via the nozzle 11, also serves to adequately moisten the ash.

Die Ausführung nach den Figuren 3 bis 5 unter­scheidet sich von der vorbeschriebenen im wesent­lichen durch die Ausnutzung von schwenkbaren Dü­sen 20, die geeignet sind für die Abgabe eines scharf gebündelten, konzentrierten Wasserstrah­les 22 unter hohem Druck wie vorzugsweise 30 bis 50 bar. Der Figur 4 ist zu entnehmen, daß diese Wasserstrahlen 22 wiederum tangential zu den Wellen 2 und 3 gerichtet sind. Infolge der Schwenkbewegung der Düsen 20 können dabei jedoch wiederum fächerförmige Strahlen hervorgerufen werden, wobei sich der Fächer zwar nicht gleich­zeitig ausbildet, jedoch das im Bereich eines Fächers stehende Wasser unter einem erheblich höheren Druck steht als bei der Ausführung nach Figur 1 und 2.The embodiment according to FIGS. 3 to 5 differs from the one described above essentially by the use of pivotable nozzles 20 which are suitable for the delivery of a sharply bundled, concentrated water jet 22 under high pressure, preferably 30 to 50 bar. It can be seen from FIG. 4 that these water jets 22 are again directed tangentially to the shafts 2 and 3. As a result of the pivoting movement of the nozzles 20, however, fan-shaped jets can again be produced, the fan not forming at the same time, but the water standing in the area of a fan being at a considerably higher pressure than in the embodiment according to FIGS. 1 and 2.

Für eine gemeinsame Schwenkbewegung sind die Dü­sen 20 durch eine Stange 23 miteinander gekoppelt, die mit einem Motor 24 verbunden ist, durch den die Stange 23 entsprechend dem Doppelpfeil 25 hin und her zu bewegen ist, so daß die einzel­nen Düsen 20, die über Schläuche 26 mit der Hauptleitung 17 verbunden sind, um ihre Achse 28 drehen können, wobei sie sich in einem Schlitz 29 des Gehäuses 1 hin und her bewegen.For a common pivoting movement, the nozzles 20 are coupled to one another by a rod 23, which is connected to a motor 24, through which the rod 23 is to be moved back and forth in accordance with the double arrow 25, so that the individual nozzles 20, which are connected to the main line 17 via hoses 26, can rotate about their axis 28, whereby they rotate in a slot 29 in the housing 1 and move around.

Bei dieser Ausführungsform der Erfindung ist die Anzahl der Düsen kleiner als bei der Aus­führungsform nach Figur 1, da eine Düse 20 in­folge ihrer Schwenkbarkeit einen größeren Be­reich erfaßt. Die Schwenkbewegung der Düsen 20 erfolgt nicht synchron mit der Umdrehung der Wellen 2 und 3, sondern vorzugsweise etwas ver­zögert von einer Umdrehung zu einer weiteren Um­drehung, so daß im Verlaufe mehrerer Wellenum­drehungen alle Bereiche der Wellenoberfläche von eventuellen Ansätzen gesäubert werden. Im übrigen lassen sich auch bei dieser Anordnung die einzelnen Düsen 20 nacheinander über Mag­netventile mit Wasser versorgen. Da jedoch je­de Düse im Bereich mehrerer Paddel wirksam ist, arbeitet sie vorzugsweise fortlaufend während mehrerer Umdrehungen einer Welle.In this embodiment of the invention, the number of nozzles is smaller than in the embodiment according to FIG. 1, since a nozzle 20 covers a larger area due to its pivotability. The pivoting movement of the nozzles 20 does not take place synchronously with the rotation of the shafts 2 and 3, but preferably with a slight delay from one rotation to a further rotation, so that all areas of the shaft surface are cleaned of any deposits in the course of several shaft rotations. In this arrangement, the individual nozzles 20 can also be supplied with water one after the other via magnetic valves. However, since each nozzle is effective in the area of several paddles, it preferably works continuously during several revolutions of a shaft.

Claims (13)

1. Anfeuchtschnecke mit flügelartigen Paddeln, die auf mindestens einer Welle angeordnet sind, welche in einem Gehäuse liegt, das mit einem Einlauf und Auslauf für staubför­mige Materialien versehen ist, sowie mit Düsen für die Zugabe von Wasser, dadurch gekennzeichnet, daß die Anfeuchtschnecke mit in Wellenrichtung hintereinander liegen­den Hochdruckdüsen (11, 20) versehen ist, mit denen ein Anteil des Anfeuchtwassers unter einem Druck von mehr als 10 bar, ins­besondere 30 bis 50 bar, auf die Rückseite der Paddel (7) und an die Welle (2, 3) zu sprühen ist.1. moistening screw with wing-like paddles, which are arranged on at least one shaft, which is located in a housing which is provided with an inlet and outlet for dusty materials, and with nozzles for the addition of water, characterized in that the moistening screw with High-pressure nozzles (11, 20) lying one behind the other are provided, with which a portion of the dampening water under a pressure of more than 10 bar, in particular 30 to 50 bar, on the back of the paddles (7) and on the shaft (2, 3) is to be sprayed. 2. Anfeuchtschnecke nach Anspruch 1, dadurch gekennzeichnet, daß die Düsen (11, 20) so ausgebildet sind, daß sie einen fächerför­migen Strahl abgeben.2. moistening screw according to claim 1, characterized in that the nozzles (11, 20) are designed so that they emit a fan-shaped jet. 3. Anfeuchtschnecke nach Anspruch 1, dadurch ge­kennzeichnet, daß der Strahl (15) annähernd tangential auf die Rückseite der Paddel (7, 7′) gerichtet ist.3. moistening screw according to claim 1, characterized in that the jet (15) is directed approximately tangentially to the back of the paddle (7, 7 '). 4. Anfeuchtschnecke nach Anspruch 1, dadurch ge­kennzeichnet, daß der Strahl (15) tangential an die Welle (2, 3) gerichtet ist.4. moistening screw according to claim 1, characterized in that the jet (15) is directed tangentially to the shaft (2, 3). 5. Anfeuchtschnecke nach Anspruch 1, dadurch ge­kennzeichnet, daß die Anfeuchtschnecke zwei parallel liegende Wellen (2, 3) mit schnecken­förmig angeordneten Paddeln (7, 7′) aufweist und jeder Paddelschnecke (2, 7; 3, 7′) eigene Düsen (13, 14, 20) zugeordnet sind.5. moistening screw according to claim 1, characterized in that the moistening screw has two parallel shafts (2, 3) with helical paddles (7, 7 ') and each paddle screw (2, 7; 3, 7') own nozzles (13 , 14, 20) are assigned. 6. Anfeuchtschnecke nach Anspruch 1, dadurch ge­kennzeichnet, daß bei zwei gegenläufig rotie­renden Paddelschnecken die Düsen (13, 14, 20) tangential auf die einander zugewandten Seiten der Wellen (2, 3) ausgerichtet sind.6. moistening screw according to claim 1, characterized in that with two counter-rotating paddle screws, the nozzles (13, 14, 20) are aligned tangentially to the mutually facing sides of the shafts (2, 3). 7. Anfeuchtschnecke nach Anspruch 1, dadurch gekennzeichnet, daß den in Förderrichtung einer Reihe hintereinander stehenden Düsen (13, 14, 20) Wasser aufeinanderfolgend wäh­rend jeder Wellenumdrehung zugeführt wird.7. moistening screw according to claim 1, characterized in that the in the conveying direction of a row of nozzles (13, 14, 20) successively water is supplied in succession during each shaft revolution. 8. Anfeuchtschnecke nach Anspruch 1, dadurch gekennzeichnet, daß den einzelnen Paddeln (7, 7′) jeweils eine Düse (13) zugeordnet ist.8. moistening screw according to claim 1, characterized in that the individual paddles (7, 7 ') are each assigned a nozzle (13). 9. Anfeuchtschnecke nach Anspruch 1, dadurch gekennzeichnet, daß die Düsen (20) in Wel­lenrichtung hin und her beweglich angeord­net sind.9. moistening screw according to claim 1, characterized in that the nozzles (20) are arranged to move back and forth in the shaft direction. 10. Anfeuchtschnecke nach Anspruch 1, dadurch gekennzeichnet, daß die beweglichen Düsen (20) miteinander mechanisch gekoppelt sind.10. moistening screw according to claim 1, characterized in that the movable nozzles (20) are mechanically coupled to each other. 11. Anfeuchtschnecke nach Anspruch 1, dadurch gekennzeichnet, daß die Bewegungen der Düsen (20) zeitlich versetzt zu den Umdrehun­gen der Wellen (2, 3) erfolgt.11. moistening screw according to claim 1, characterized characterized in that the movements of the nozzles (20) occur at different times from the revolutions of the shafts (2, 3). 12. Anfeuchtschnecke nach Anspruch 1, dadurch gekennzeichnet, daß für die Ansteuerung der Düsen (13, 14, 20) Magnetventile (19) vorge­sehen sind.12. moistening screw according to claim 1, characterized in that for controlling the nozzles (13, 14, 20) solenoid valves (19) are provided. 13. Verfahren zum Reinigen einer Anfeuchtschnecke, die mit auf mindestens einer Welle angeordne­ten Paddeln versehen ist, dadurch gekennzeich­net, daß die Rückseite der Paddel (7) sowie die Welle (2, 3) während des Betriebes der Anfeuchtschnecke mit Anfeuchtwasser für das Mischgut besprüht wird, das unter einem Hoch­druck von 10 bis 60 bar steht.13. A method for cleaning a dampening screw, which is provided with paddles arranged on at least one shaft, characterized in that the back of the paddles (7) and the shaft (2, 3) is sprayed with dampening water for the mixture during operation of the dampening screw , which is under a high pressure of 10 to 60 bar.
EP89113212A 1988-08-20 1989-07-19 Wetting screw and method for cleaning same Withdrawn EP0357919A1 (en)

Applications Claiming Priority (2)

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DE3828405 1988-08-20
DE3828405A DE3828405A1 (en) 1988-08-20 1988-08-20 Moistening screw and method of cleaning it

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DE (1) DE3828405A1 (en)
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FR2700492A1 (en) * 1993-01-20 1994-07-22 Bingler Albert Concrete mixer with a high pressure washing device.
EP0629351A1 (en) * 1993-06-17 1994-12-21 Hauni Maschinenbau Aktiengesellschaft Device for the treatment of tobacco
FR2736284A1 (en) * 1995-07-03 1997-01-10 Gec Alsthom Stein Ind Washing of ash produced during incineration waste - using modular washer containing two interacting screws which wash solids under pressure in acidic or basic conditions
WO2000061273A2 (en) * 1999-04-14 2000-10-19 Merkle Engineers, Inc. In-barrel wetting screw charger
CN104003120A (en) * 2014-06-06 2014-08-27 智思控股集团有限公司 Tobacco material backfill feeding device and method
CN110898746A (en) * 2019-11-26 2020-03-24 北新集团建材股份有限公司 Anti-caking device for dry material port of mixing machine

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DE4213344C2 (en) * 1992-04-23 1998-10-08 Flexible Fertigungstechnik Gmb Device for producing a reactive multi-component mixture
DE29715710U1 (en) * 1997-09-02 1997-10-23 Intensiv-Filter Gmbh & Co Kg, 42555 Velbert Cleaning device for an industrial silencer
DE19824991C2 (en) * 1998-06-04 2002-11-14 Kilia Fleischerei Und Spezial Cutter cleaning device
DE19904994A1 (en) * 1999-02-08 2000-08-10 Buehler Ag Nozzle rod for injecting liquids into a mixing vessel has a housing that can be tilted and a connecting piece
DE10157970B4 (en) * 2000-11-29 2005-11-03 Alexander Kniele Mixer with a device for cleaning the same
CN108905688A (en) * 2018-07-17 2018-11-30 淮安青岛科技大科技服务有限公司 A kind of anti-corrosion material blender stirred evenly

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Publication number Priority date Publication date Assignee Title
FR2700492A1 (en) * 1993-01-20 1994-07-22 Bingler Albert Concrete mixer with a high pressure washing device.
EP0608191A1 (en) * 1993-01-20 1994-07-27 Mebi Production S.A. Concrete mixer with high pressure washing device
EP0629351A1 (en) * 1993-06-17 1994-12-21 Hauni Maschinenbau Aktiengesellschaft Device for the treatment of tobacco
FR2736284A1 (en) * 1995-07-03 1997-01-10 Gec Alsthom Stein Ind Washing of ash produced during incineration waste - using modular washer containing two interacting screws which wash solids under pressure in acidic or basic conditions
WO2000061273A2 (en) * 1999-04-14 2000-10-19 Merkle Engineers, Inc. In-barrel wetting screw charger
WO2000061273A3 (en) * 1999-04-14 2001-04-19 Merkle Eng Inc In-barrel wetting screw charger
US6349570B1 (en) 1999-04-14 2002-02-26 Merkle Engineers, Inc. In-barrel wetting screw charger
CN104003120A (en) * 2014-06-06 2014-08-27 智思控股集团有限公司 Tobacco material backfill feeding device and method
CN110898746A (en) * 2019-11-26 2020-03-24 北新集团建材股份有限公司 Anti-caking device for dry material port of mixing machine
CN110898746B (en) * 2019-11-26 2021-01-29 北新集团建材股份有限公司 Anti-caking device for dry material port of mixing machine

Also Published As

Publication number Publication date
DK406989D0 (en) 1989-08-18
DE3828405A1 (en) 1990-02-22
ZA887682B (en) 1989-07-26
DK406989A (en) 1990-02-21

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