EP0078286A1 - Pneumatic powder supply installation - Google Patents

Pneumatic powder supply installation

Info

Publication number
EP0078286A1
EP0078286A1 EP82901415A EP82901415A EP0078286A1 EP 0078286 A1 EP0078286 A1 EP 0078286A1 EP 82901415 A EP82901415 A EP 82901415A EP 82901415 A EP82901415 A EP 82901415A EP 0078286 A1 EP0078286 A1 EP 0078286A1
Authority
EP
European Patent Office
Prior art keywords
container
conveying
metering valve
delivery pipe
nozzle
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Withdrawn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
EP82901415A
Other languages
German (de)
French (fr)
Inventor
Norbert Ahrens
Frank Schaberg
Gerhard Balzau
Jürgen KRÜTZNER
Laurenz OSTHÖVER
Wolfgang Kluger;
Heinrich Klockenbusch
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.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Krupp Polysius AG
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 Krupp Polysius AG filed Critical Krupp Polysius AG
Publication of EP0078286A1 publication Critical patent/EP0078286A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/40—Feeding or discharging devices
    • B65G53/42—Nozzles

Definitions

  • the invention relates to a device for the pneumatic conveying of fine material, containing a container intended for receiving the fine material, in the bottom area of which a nozzle for supplying a gaseous conveying medium is arranged, which protrudes into the open lower end of a conveying pipe which extends vertically through the interior of the container runs and is guided outwards from the upper region of the container, the nozzle and the lower end of the delivery pipe being adjustable relative to one another in the axial direction.
  • containers are known in the bottom area of which a nozzle for supplying a gaseous conveying medium is fixedly arranged, which protrudes into the open lower end of a conveying pipe.
  • the gaseous conveying medium emerging from the nozzle at high speed entrains fine material from the lower region of the container into the conveying pipe.
  • a change in the amount of fine material conveyed can take place within the limits of the type of conveying equipment by influencing the amount of conveying gas.
  • a sensitive adjustment of the quantity of goods to be conveyed within wide limits as well as a quick stop of the conveyance if necessary are not possible with these known conveying devices.
  • Conveyors of the type mentioned at the outset have also been developed, in which the nozzle and the lower end of the conveyor tube are in the axial direction can be adjusted relative to one another, for example by moving the nozzle more or less far into the conveying tube and thereby changing the gap between the nozzle and the conveying tube for the entry of the fine material accordingly.
  • the invention is therefore based on the object, while avoiding these deficiencies of the known designs, of designing a pneumatic conveying device of the type mentioned at the outset in such a way that, even in the case of fine material which is difficult to flow and / or has a tendency to build up, it adjusts the quantity of conveyed material sensitively wide limits enables, if necessary, a quick stop of the conveyance as well as an immediate empty blowing of the delivery pipe and the subsequent delivery line and, moreover, allows a desired restart with a low delivery rate
  • the nozzle and the lower end of the conveyor tube form a shut-off valve which blocks or releases the fine material entry into the conveyor tube
  • a metering valve which can be controlled as a function of the pressure in the conveyor pipe is arranged in the conveyor pipe near its outlet from the container.
  • the height-adjustable nozzle is thus at the lower end of the
  • Conveyor tube not used to adjust the quantity of material to be conveyed, but only as a shut-off valve that blocks or releases the conveyance.
  • the quantity of material to be conveyed (when the shut-off valve is open) is adjusted by means of the metering valve which is arranged in the conveyor pipe near its outlet from the container.
  • O ⁇ VPI Distribute the fine material entering the delivery pipe approximately symmetrically to the nozzle evenly over the cross-section of the delivery pipe before it comes into the area of the metering valve after the fine material has accelerated in the first part of the vertical delivery section.
  • the metering valve works at a point on the pneumatic conveying path at which there is pure flight promotion and approximately uniform flow conditions are present.
  • Dosing valve is arranged close to the outlet of the delivery pipe from the container and not at a greater distance from the container. Only at one close to
  • the position of the metering valve provided in the container results in a short response time for the change in the quantity of fine material in the conveying line connected to the conveying pipe.
  • shut-off valve Since the shut-off valve is located at the lower end of the delivery pipe, when this valve is closed (ie when the fine material entry into the delivery pipe is interrupted), no troublesome crop plug builds up in the riser pipe, since this initially continues through the nozzle inflowing medium blows the delivery pipe freely. In this way, problems caused by a plug in the conveyor pipe when starting up are avoided.
  • the device according to the invention is expediently operated in such a way that
  • shut-off valve is opened at the start of a subsidy and shut off at the end
  • the pressure in the delivery pipe is measured, the value is compared to a predetermined target value and the metering valve is adjusted as a function of the difference between the actual value and the target value.
  • the flow velocity in the area of the metering valve is expediently between 10 and 30 m / s, preferably between 15 and 22 m / s, and the fine material loading of the gaseous conveying medium between 0.3 and 6, preferably between 0.5 and 4 kg Fine goods / kg pumped medium.
  • Tukt ⁇ T 1 shows a schematic side view of a conveyor device according to the invention
  • FIG. 2 shows a detail (according to II) from FIG. 1.
  • the device shown for example for the pneumatic conveying of coal dust, contains a fine material storage silo 1 with a pressure-shock-resistant filter 2 and an explosion chimney 3, as well as a conveying container 4, which is only used as a
  • a conveying gas line 7 opens into the bottom region of the conveying container 4 via a nozzle 6.
  • a conveying pipe 8 is arranged centrally in the conveying container 4, the lower edge 8a of which has a fixed clear distance from the bottom 4a of the conveying container 4.
  • the delivery pipe 8 is led through the ceiling 4b of the delivery container 4 to the outside and connected via a bend 28 to a delivery line 29 connected to a consumer.
  • a metering valve 30, which is formed, for example, by a rotatable flap, is arranged in the rectilinear part of the conveyor tube 8 (i.e. even before the elbow 28) in the conveyor tube 8, just behind the outlet of the conveyor tube 8.
  • a pressure measuring probe 31 is provided in the delivery line 29 and is connected to a controller 32. This controller also contains a setpoint signal 33 and supplies an output signal 34 to a servomotor 35 which is used to set the
  • a vent line 9 leads from the ceiling 4b of the conveying container 4 to a flame flashback fuse 10.
  • the nozzle 6 in the lower region of the delivery container forms, together with the lower edge 8a of the delivery tube 8, a shut-off valve.
  • the nozzle 6, which has a conical shape with a cone slope of approximately 1: 2.5, is axially relative to the lower edge 8a of the delivery pipe 8 between a lower (opening) by a pneumatic actuating cylinder 11 in a sliding guide 12 -) Position and an upper (closed) position adjustable.
  • the nozzle 6 In the lower position, the nozzle 6 leaves an annular gap through which the fine material located in the conveying container 4 can enter the conveying tube 8 under the action of the gaseous conveying medium emerging from the nozzle in the direction of arrow 21 (arrows 22 ). In the upper position, on the other hand, the nozzle 6 bears against the lower edge 8a of the delivery pipe 8 and thus closes the annular gap between the nozzle and the delivery pipe, interrupting the fine material conveyance.
  • the lower area of the conveying container 4 is provided with a ventilation device 13.
  • a pneumatically actuated Butterfly valve 14 and an explosion protection valve 15 are arranged in the feed gas line 7.
  • the conveyor device described is particularly suitable for dosing dusts, for example coal dust, in the lower output range (from about 100 kg to 5000 kg / h).
  • the metering valve 30 is expedient in a straight part of the delivery pipe
  • the metering valve 30 emerges directly behind the Au, the delivery pipe 8 emerges from the conveying container 4, but is arranged in front of the subsequent elbow 28, embodiments are also possible within the scope of the invention in which the metering valve is just behind this elbow 28 is arranged in the conveyor line 29.
  • the pressure measuring point (pressure measuring probe 31) is expediently arranged in the delivery pipe 8 or in the subsequent delivery line 29 - seen in the flow direction - behind the metering valve 30.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Transport Of Granular Materials (AREA)

Abstract

Installation d'alimentation pneumatique en poudre, dans laquelle un injecteur (6) et l'orifice inferieur d'un conduit d'alimentation (8) constituent une vanne (6, 8) ouvrant ou obturant ce conduit. Une vanne de dosage (30) est montee sur le conduit d'alimentation, pres de sa sortie (4, 6) du conteneur (4); elle est commandee par la pression (31) regnant dans le conduit (29). Ainsi sont rendus possibles un reglage fin du debit de poudre sur une vaste echelle, meme lorsque la poudre s'ecoule difficilement et/ou tend a s'agglomerer, un arret brusque (14) de l'alimentation, un balayage immediat du conduit (8), ou encore un redemarrage de l'alimentation a faible puissance (11/6, 8).Pneumatic powder feed installation, in which an injector (6) and the lower orifice of a supply duct (8) constitute a valve (6, 8) opening or closing this duct. A metering valve (30) is mounted on the supply duct, near its outlet (4, 6) of the container (4); it is controlled by the pressure (31) reigning in the duct (29). Thus, fine adjustment of the powder flow rate over a large scale is made possible, even when the powder flows with difficulty and / or tends to agglomerate, a sudden stop (14) of the feed, an immediate sweeping of the duct ( 8), or a restart of the power supply at low power (11/6, 8).

Description

- 1 - - 1 -
Vorrichtung zur pneumatischen Förderung von FeinguDevice for the pneumatic conveying of Feingu
Die Erfindung betrifft eine Vorrichtung zur pneu¬ matischen Förderung von Feingut, enthaltend einen zur Aufnahme des Feingutes bestimmten Behälter, in dessen Bodenbereich eine zur Zuführung eines gas¬ förmigen Fördermediums dienende Düse angeordnet is die in das offene untere Ende eines Förderrohres hineinragt, das vertikal durch den Innenraum des Behälters verläuft und aus dem oberen Bereich des Behälters nach außen geführt ist, wobei die Düse und das untere Ende des Förderrohres in axialer Richtung relativ zueinander verstellbar sind.The invention relates to a device for the pneumatic conveying of fine material, containing a container intended for receiving the fine material, in the bottom area of which a nozzle for supplying a gaseous conveying medium is arranged, which protrudes into the open lower end of a conveying pipe which extends vertically through the interior of the container runs and is guided outwards from the upper region of the container, the nozzle and the lower end of the delivery pipe being adjustable relative to one another in the axial direction.
zur pneumatischen Förderung von Feingut sind Be¬ hälter bekannt, in deren Bodenbereich eine zur Zu¬ führung eines gasförmigen Fördermediums dienende Düse fest angeordnet ist, die in das offene untere Ende eines Förderrohres hineinragt. Das aus der Düse mit hoher Geschwindigkeit austretende gasför¬ mige Fördermedium reißt Feingut aus dem unteren Bereich des Behälters mit in das Förderrohr. Eine Änderung der geförderten Feingutmenge kann bei der artigen Fördereinrichtungen in gewissen Grenzen durch Beeinflussung der Fördergasmenge erfolgen. Eine feinfühlige Einstellung der Fördergutmenge in weiten Grenzen sowie ein im Bedarfsfälle erfol¬ gender Schnellstopp der Förderung sind jedoch bei diesen bekannten Fördervorrichtungen nicht möglich.For the pneumatic conveying of fine material, containers are known in the bottom area of which a nozzle for supplying a gaseous conveying medium is fixedly arranged, which protrudes into the open lower end of a conveying pipe. The gaseous conveying medium emerging from the nozzle at high speed entrains fine material from the lower region of the container into the conveying pipe. A change in the amount of fine material conveyed can take place within the limits of the type of conveying equipment by influencing the amount of conveying gas. However, a sensitive adjustment of the quantity of goods to be conveyed within wide limits as well as a quick stop of the conveyance if necessary are not possible with these known conveying devices.
Man hat weiterhin Fördervorrichtungen der eingangs genannten Art entwickelt, bei denen die Düse und das untere Ende des Förderrohres in axialer Richtun relativ zueinander verstellbar sind, indem bei¬ spielsweise die Düse mehr oder weniger weit in das Förderrohr hineingefahren und dadurch der zwischen Düse und För erröhr vorhandene Spalt für den Eintritt des Feingutes entsprechend verändert wird. Bei einer solchen Ausführung ist es auch be¬ kannt (DE-G 70 22 424), die Höhenverstellung der Düse gegenüber dem offenen unteren Ende des Förder¬ rohres in Abhängigkeit vom Druckunterschied zwische dem Innenraum des Behälters und dem Förderrohr vor¬ zunehmen.Conveyors of the type mentioned at the outset have also been developed, in which the nozzle and the lower end of the conveyor tube are in the axial direction can be adjusted relative to one another, for example by moving the nozzle more or less far into the conveying tube and thereby changing the gap between the nozzle and the conveying tube for the entry of the fine material accordingly. In such an embodiment, it is also known (DE-G 70 22 424) to adjust the height of the nozzle relative to the open lower end of the delivery pipe as a function of the pressure difference between the interior of the container and the delivery pipe.
Umfangreiche praktische Untersuchungen der Erfinder zeigten jedoch, daß auch mit derartigen'Vorrichtun- gen eine feinfühlige Einstellung der geförderten Feingutmenge insbesondere bei schwer fließendem Feingut nicht möglich ist. Eine deutliche Änderung der geförderten Feingutmenge bei einer gegebenen Verstellung der Düse stellt sich nämlich erst bei einem verhältnismäßig kleinen Spalt zwischen Düse und Förderrohr ein; bei kleiner Spaltgröße besteht jedoch in besonderem Maße die Gefahr, daß zu An¬ backungen neigende Feingutteilchen oder gröbere Partikel den Spalt zusetzen.However, extensive practical investigations by the inventors showed that even with devices of this type, a sensitive adjustment of the amount of fine material conveyed is not possible, particularly in the case of fine material which is difficult to flow. A significant change in the amount of fine material conveyed for a given adjustment of the nozzle occurs only with a relatively small gap between the nozzle and the delivery pipe; in the case of a small gap size, however, there is a particular risk that fines or coarser particles that tend to build up will clog the gap.
Der Erfindung liegt daher die Aufgabe zugrunde, unter Vermeidung dieser Mängel der bekannten Aus¬ führungen eine pneumatische Fördervorrichtung der eingangs genannten Art so auszubilden, daß sie auch bei schwer fließendem und/oder zu An¬ backungen neigenden Feingut eine feinfühlige Ein¬ stellung der Fördergutmenge in weiten Grenzen ge- stattet, in Bedarfsfälle einen Schnellstopp der Förderung sowie ein sofortiges Leerblasen des Förderrohres und der anschließenden Förderleitung ermöglicht und darüber hinaus ein etwa gewünschtes Wiederanfahren mit kleiner Förderleistung gestattThe invention is therefore based on the object, while avoiding these deficiencies of the known designs, of designing a pneumatic conveying device of the type mentioned at the outset in such a way that, even in the case of fine material which is difficult to flow and / or has a tendency to build up, it adjusts the quantity of conveyed material sensitively wide limits enables, if necessary, a quick stop of the conveyance as well as an immediate empty blowing of the delivery pipe and the subsequent delivery line and, moreover, allows a desired restart with a low delivery rate
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daßThis object is achieved in that
a) die Düse und das untere Ende des Förderrohres ein den Feingut-Eintritt in das Förderrohr ab¬ sperrendes oder freigebendes Absperrventil bil¬ den, währenda) the nozzle and the lower end of the conveyor tube form a shut-off valve which blocks or releases the fine material entry into the conveyor tube, while
b) im Förderrchr nahe seinem Austritt aus dem Behäl ter ein in Abhängigkeit vom Druck im Förderrohr steuerbares Dosierventil angeordnet ist.b) a metering valve which can be controlled as a function of the pressure in the conveyor pipe is arranged in the conveyor pipe near its outlet from the container.
Bei der erfindungsgemäßen Vorrichtung wird somit die höhenverstellbare Düse am unteren Ende desIn the device according to the invention, the height-adjustable nozzle is thus at the lower end of the
Förderrohres nicht zur Einstellung der Fördergut¬ menge, sondern lediglich als ein die Förderung absperrendes oder freigebendes Absperrventil be¬ nutzt. Die Einstellung der Fördergutmenge (bei ge- öffneten Absperventil) erfolgt erfindungsgemäß durch das Dosierventil, das im Förderrohr nahe seinem Austritt aus dem Behälter angeordnet ist.Conveyor tube not used to adjust the quantity of material to be conveyed, but only as a shut-off valve that blocks or releases the conveyance. According to the invention, the quantity of material to be conveyed (when the shut-off valve is open) is adjusted by means of the metering valve which is arranged in the conveyor pipe near its outlet from the container.
Diese Anordnung des Dosierventiles hat sich bei den der Erfindung zugrundeliegenden Versuchen als wesentlich erwiesen. Da das Förderrohr im Behälter zunächst in vertikaler Richtung verläuft, kann sichThis arrangement of the metering valve has proven to be essential in the experiments on which the invention is based. Since the conveyor pipe in the container initially runs in the vertical direction, can
OΛVPI das annähernd symmetrisch zur Düse in das Förder- röhr eintretende Feingut gleichmäßig über den Querschnitt des Förderrohres verteilen, ehe es nach einer im ersten Teil der senkrechten Förder- strecke erfolgenden Beschleunigung des Feingutes in den Bereich des Dosierventiles kommt. Das Dosier ventil arbeitet infolgedessen an einer Stelle der pneumatischen Förderstrecke, an der eine reine Flug förderung vorliegt und annähernd gleichmäßige Strömungsverhältnisse gegeben sind.OΛVPI Distribute the fine material entering the delivery pipe approximately symmetrically to the nozzle evenly over the cross-section of the delivery pipe before it comes into the area of the metering valve after the fine material has accelerated in the first part of the vertical delivery section. As a result, the metering valve works at a point on the pneumatic conveying path at which there is pure flight promotion and approximately uniform flow conditions are present.
Wesentlich ist auf der anderen Seite, daß dasOn the other hand, it is essential that the
Dosierventil nahe am Austritt des Förderrohres aus dem Behälter und nicht etwa in größerem Abstand vom Behälter angeordnet ist. Nur bei einer nahe amDosing valve is arranged close to the outlet of the delivery pipe from the container and not at a greater distance from the container. Only at one close to
Behälter vorgesehenen Lage des Dosierventiles ergib sich bei einer Änderung der Einstellung des Dosier¬ ventiles eine kurze Ansprechzeit für die Änderung der Feingutmenge in der an das Fδrderrohr anschließ den Förderleitung.If the setting of the metering valve changes, the position of the metering valve provided in the container results in a short response time for the change in the quantity of fine material in the conveying line connected to the conveying pipe.
Da sich das Absperrventil am unteren Ende des För¬ derrohres befindet, kann sich beim Schließen dieses Ventiles (d.h. bei Unterbrechung des Feingut-Ein- tritts in das Förderrohr) kein störender Gut¬ pfropfen im Steigrohr bilden, da das durch die Düse zunächst noch weiter zuströmende Fördermedium das Förderrohr frei bläst. Auf diese Weise werden durch einen Gutpfropfen im Förderrohr beim Wiederanfahren bedingte Schwierigkeiten vermieden.Since the shut-off valve is located at the lower end of the delivery pipe, when this valve is closed (ie when the fine material entry into the delivery pipe is interrupted), no troublesome crop plug builds up in the riser pipe, since this initially continues through the nozzle inflowing medium blows the delivery pipe freely. In this way, problems caused by a plug in the conveyor pipe when starting up are avoided.
3 Der Betrieb der erfindungsgemäßen Vorrichtung er¬ folgt zweckmäßig in der Weise, daß3 The device according to the invention is expediently operated in such a way that
a) das Absperrventil zu Beginn einer Förderung ge- öffnet und zur Beendigung abgesperrt wird, währenda) the shut-off valve is opened at the start of a subsidy and shut off at the end, while
b) zur Regelung der Menge des pneumatisch geförder ten Gutes der Druck im Förderrohr gemessen, die Wert mit einem vorgegebenen Sollwert verglichen und in Abhängigkeit von der Differenz zwischen Ist-Wert und Soll-Wert das Dosierventil verstel wird.b) to regulate the amount of pneumatically conveyed material, the pressure in the delivery pipe is measured, the value is compared to a predetermined target value and the metering valve is adjusted as a function of the difference between the actual value and the target value.
Wie umfangreiche Versuche mit den verschiedensten Materialien und bei unterschiedlicher Feingut-Be¬ ladung des gasförmigen Fördermediums ergaben, läßt sich durch eine solche Regelung die Menge des pneu¬ matisch geförderten Gutes innerhalb we-ter Grenzen auf einem vorgegebenen Soll-Wert sehr genau konstan halten.As extensive tests with the most varied of materials and with different fine material loading of the gaseous conveying medium have shown, such a regulation allows the amount of the pneumatically conveyed material to be kept very precisely constant within a set target value within further limits.
Zweckmäßig liegt hierbei die Strömungsgeschwindig¬ keit im Bereich des Dosierventiles zwischen 10 und 30 m/s, vorzugsweise zwischen 15 und 22 m/s und die Feingut-Beladung des gasförmigen Fördermediums zwischen 0,3 und 6, vorzugsweise zwischen 0,5 und 4 kg Feingut/kg Fördermedium.The flow velocity in the area of the metering valve is expediently between 10 and 30 m / s, preferably between 15 and 22 m / s, and the fine material loading of the gaseous conveying medium between 0.3 and 6, preferably between 0.5 and 4 kg Fine goods / kg pumped medium.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung veranschaulicht. Es zeigenAn embodiment of the invention is illustrated in the drawing. Show it
TuktΛT Fig.1 eine schematische Seitenansicht einer erfindungsgemäßen Fördervorrichtung;TuktΛT 1 shows a schematic side view of a conveyor device according to the invention;
Fig.2 ein Detail (gemäß II) aus Fig.1.2 shows a detail (according to II) from FIG. 1.
Die dargestellte, beispielsweise zur pneumatischen Förderung von Kohlenstaub dienende Vorrichtung ent¬ hält ein Feingut-Vorratssilo 1 mit einem druckstoß- festen Filter 2 und einem Explosionsschlot 3, ferner einen Förderbehälter 4, der über eine lediglich alsThe device shown, for example for the pneumatic conveying of coal dust, contains a fine material storage silo 1 with a pressure-shock-resistant filter 2 and an explosion chimney 3, as well as a conveying container 4, which is only used as a
Explosionsschütz dienende, nicht jedoch als Dosieror erforderliche, Zellenradschleuse 5 verbunden ist.Explosion-proof serving, but not required as a Dosieror, cellular wheel lock 5 is connected.
In den Bodenbereich des Förderbehälters 4 mündet über eine Düse 6 eine Fördergasleitung 7 ein. Im Förderbehälter 4 ist zentral ein Fδrderrohr 8 an¬ geordnet, dessen unterer Rand 8a einen festen lich¬ ten Abstand vom Boden 4a des Förderbehälters 4 auf¬ weist. Das Förderrohr 8 ist durch die Decke 4b des Förderbehälters 4 nach außen geführt und über einen Krümmer 28 an eine mit einem Verbraucher verbundene Förderleitung 29 angeschlossen.A conveying gas line 7 opens into the bottom region of the conveying container 4 via a nozzle 6. A conveying pipe 8 is arranged centrally in the conveying container 4, the lower edge 8a of which has a fixed clear distance from the bottom 4a of the conveying container 4. The delivery pipe 8 is led through the ceiling 4b of the delivery container 4 to the outside and connected via a bend 28 to a delivery line 29 connected to a consumer.
Dicht hinter dem Austritt des Förderrohres 8 aus dem Förderbehälter 4 ist im geradlinigen Teil des Förderrohres 8 (d.h. noch vor dem Krümmer 28) im Förderrohr 8 ein Dosierventil 30 angeordnet, das beispielsweise durch eine drehbare Klappe gebildet wird. In der Förderleitung 29 ist eine Druckmeß- sonde 31 vorgesehen, die an einen Regler 32 an¬ geschlossen ist. Dieser Regler enthält außerdem ein Sollwert-Signal 33 und führt ein Ausgangssignal 34 einem Stellmotor 35 zu, der zur Einstellung desA metering valve 30, which is formed, for example, by a rotatable flap, is arranged in the rectilinear part of the conveyor tube 8 (i.e. even before the elbow 28) in the conveyor tube 8, just behind the outlet of the conveyor tube 8. A pressure measuring probe 31 is provided in the delivery line 29 and is connected to a controller 32. This controller also contains a setpoint signal 33 and supplies an output signal 34 to a servomotor 35 which is used to set the
fuKfcA Dosierventiles 30 dient.fu Kf cA Dosing valve 30 is used.
Von der Decke 4b des Förderbehälters 4 führt eine Entlüftungsleitung 9 zu einer Flammenrückschlag- Sicherung 10.A vent line 9 leads from the ceiling 4b of the conveying container 4 to a flame flashback fuse 10.
Die Düse 6 in unteren Bereich des Förderbehälters bildet zusammen mit dem unteren Rand 8a des Förder rohres 8 ein Absperrventil. Zu diesem Zweck ist die Düse 6, die eine konische Form mit einer Konus steigung von etwa 1 : 2,5 aufweist, durch einen pneumatischen Stellzylinder 11 in einer Gleit¬ führung 12 axial relativ zum unteren Rand 8a des Förderrohres 8 zwischen einer unteren (öffnungs-) Stellung und einer oberen (Schließ-) Stellung ver¬ stellbar.The nozzle 6 in the lower region of the delivery container forms, together with the lower edge 8a of the delivery tube 8, a shut-off valve. For this purpose, the nozzle 6, which has a conical shape with a cone slope of approximately 1: 2.5, is axially relative to the lower edge 8a of the delivery pipe 8 between a lower (opening) by a pneumatic actuating cylinder 11 in a sliding guide 12 -) Position and an upper (closed) position adjustable.
In der unteren Stellung läßt die Düse 6 einen Ring¬ spalt frei, durch den das im Förderbehälter 4 befindliche Feingut unter der Wirkung des aus der Düse in Richtung des Pfeiles 21 austretenden gas¬ förmigen Fördermediums in das Förderrohr 8 ein¬ treten kann (Pfeile 22) . In der oberen Stellung liegt dagegen die Düse 6 am unteren Rand 8a des Förderrohres 8 an und verschließt damit den Ring¬ spalt zwischen Düse und Förderrohr, womit die Feingutfδrderung unterbrochen ist.In the lower position, the nozzle 6 leaves an annular gap through which the fine material located in the conveying container 4 can enter the conveying tube 8 under the action of the gaseous conveying medium emerging from the nozzle in the direction of arrow 21 (arrows 22 ). In the upper position, on the other hand, the nozzle 6 bears against the lower edge 8a of the delivery pipe 8 and thus closes the annular gap between the nozzle and the delivery pipe, interrupting the fine material conveyance.
Der untere Bereich des Förderbehälters 4 ist mit einer Belüftungseinrichtung 13 versehen. In der Fördergasleitung 7 ist als Rückschlagsicherung bei Störungsfallen eine pneumatisch betätigte Ab- sperrklappe 14 sowie ein Explosionsschutzventil 15 angeordnet.The lower area of the conveying container 4 is provided with a ventilation device 13. In the feed gas line 7, a pneumatically actuated Butterfly valve 14 and an explosion protection valve 15 are arranged.
Die beschriebene Fördervorrichtung ist insbesondere zum Dosieren von Stäuben, beispielsweise von Kohlen staub, im unteren Leistungsbereich (von etwa 100 kg bis 5000 kg/h) hervorragend geeignet.The conveyor device described is particularly suitable for dosing dusts, for example coal dust, in the lower output range (from about 100 kg to 5000 kg / h).
Wie bereits erwähnt, wird das Dosierventil 30 zweck mäßig in einem geradlinigen Teil des FörderrohresAs already mentioned, the metering valve 30 is expedient in a straight part of the delivery pipe
8 bzw. der anschließenden Förderleitung 29 angeord¬ net, um eine gleichmäßige Verteilung des Feingutes über den gesamten Strcnungsguerschnitt zu gewährlei sten. Während bei dem dargestellten Ausführungsbei- spiel das Dosierventil 30 unmittelbar hinter dem Au tritt des Förderrohres 8 aus dem Fδrderbehälter 4, jedoch vor dem anschließenden Krümmer 28 angeordnet ist, sind im Rahmen der Erfindung beispielsweise auch Ausführungen möglich, bei denen das Dosierven- til kurz hinter diesen Krümmer 28 in der Förder¬ leitung 29 angeordnet ist.8 or the subsequent conveyor line 29 to ensure a uniform distribution of the fine material over the entire flow cross section. While in the illustrated embodiment the metering valve 30 emerges directly behind the Au, the delivery pipe 8 emerges from the conveying container 4, but is arranged in front of the subsequent elbow 28, embodiments are also possible within the scope of the invention in which the metering valve is just behind this elbow 28 is arranged in the conveyor line 29.
Die Druckmeßstelle (Druckmeßsonde 31) ist zweckmäßi im Fδrderrohr 8 bzw. in der anschließenden Förder- leitung 29 - in Strömungsrichtung gesehen - hinter dem Dosierventil 30 angeordnet. The pressure measuring point (pressure measuring probe 31) is expediently arranged in the delivery pipe 8 or in the subsequent delivery line 29 - seen in the flow direction - behind the metering valve 30.

Claims

- 3 -Patentansprüche: - 3 patent claims:
1. Vorrichtung zur pneumatischen Förderung von Feingut, enthaltend einen zur Aufnahme des Feingutes bestimmten Behälter, in dessen Boden¬ bereich eine zur Zuführung eines gasförmigen Fördermediums dienende Düse angeordnet ist, die in das offene untere Ende eines Förderrohres hineinragt, das vertikal durch den Innenraum des Behälters verläuft und aus dem oberen Bereich des Behälters nach außen geführt ist, wobei die Düse und das untere Ende des Förderrohres in axialer Richtung relativ zueinander verstellbar sind, dadurch g e k e n n z e i c h n e t , da1. Device for the pneumatic conveying of fine material, containing a container intended for receiving the fine material, in the bottom region of which a nozzle for supplying a gaseous conveying medium is arranged, which protrudes into the open lower end of a conveying pipe which extends vertically through the interior of the Container extends and is guided outwards from the upper region of the container, the nozzle and the lower end of the delivery pipe being adjustable relative to one another in the axial direction, characterized in that
a) die Düse (6) und das untere Ende des Förder- rohres (8) ein" den Feingut-Eintritt in dasa) the nozzle (6) and the lower end of the delivery pipe (8) a "the fine material entry into the
Förderrohr absperrendes oder freigebendes Ab¬ sperrventil bilden, währendForm shut-off or releasing shut-off valve while
b) in Förderrohr (8) nahe seinem Austritt aus dem Behälter (4) ein in Abhängigkeit vom Druc in Förderrohr steuerbares Dosierventil (30) angeordnet ist.b) a metering valve (30) which can be controlled as a function of the pressure in the conveyor tube is arranged in the conveyor tube (8) near its outlet from the container (4).
2. Vorrichtung nach Anspruch 1, dadurch gekennzeich net, daß das Dosierventil (30) in einem geradlin gen Teil des Förderrohres (8) , vorzugsweise un¬ mittelbar vor oder kurz hinter einem im Bereich des Austritts des Förderrohres aus dem Behälter2. Apparatus according to claim 1, characterized in that the metering valve (30) in a straight part of the delivery pipe (8), preferably immediately before or just behind one in the region of the outlet of the delivery pipe from the container
(4) vorgesehenen Krümmer (28), angeordnet ist. (4) provided manifold (28) is arranged.
3. Vorrichtung nach Anspruch 1 , dadurch gekenn¬ zeichnet, daß die Druckmeßstelle (Druckmeßson¬ de 31) im Förderrohr (8) bzw. in der anschließen den Förderleitung (29) - in Strömungsrichtung gesehen - hinter dem Dosierventil (30) angeordne ist.3. Apparatus according to claim 1, characterized gekenn¬ characterized in that the pressure measuring point (Druckmeßson¬ de 31) in the delivery pipe (8) or in the connecting the delivery line (29) - seen in the flow direction - is arranged behind the metering valve (30).
4. Verfahren zum Betrieb einer Vorrichtung nach An¬ spruch 1 , dadurch gekennzeichnet, daß4. A method for operating a device according to claim 1, characterized in that
a) das Absperrventil zum Beginn einer Förderung geöffnet und zur Beendigung abgesperrt wird, währenda) the shut-off valve is opened at the beginning of a promotion and shut off at the end, while
b) zur Regelung der Menge des pneumatisch geför¬ derten Gutes der Druck im Förderrohr gemessen dieser Wert mit einem vorgegebenen Sollwert verglichen und in Abhängigkeit von der Differ zwischen Istwert und Sollwert das Dosierven- til verstellt wird.b) in order to regulate the quantity of the pneumatically conveyed material, the pressure measured in the conveying tube, this value is compared with a predetermined target value and the metering valve is adjusted as a function of the difference between the actual value and the target value.
5. Verfahren nach Anspruch 4, dadurch gekennzeich¬ net, daß die Strömungsgeschwindigkeit im Bereich des Dosierventiles zwischen 10 und 30 m/s, vor- zugsweise zwischen 15 und 22 m/s, und die Feingu5. The method according to claim 4, characterized gekennzeich¬ net that the flow rate in the region of the metering valve between 10 and 30 m / s, preferably between 15 and 22 m / s, and the Feingu
Beladung des gasförmigen Fördermediums zwischen 0,3 und 6, vorzugsweise zwischen 0,5 und 4 kg Fe gut/kg Fördernedium, liegt. Loading of the gaseous delivery medium is between 0.3 and 6, preferably between 0.5 and 4 kg Fe / kg delivery medium.
EP82901415A 1981-05-05 1982-04-25 Pneumatic powder supply installation Withdrawn EP0078286A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813117748 DE3117748A1 (en) 1981-05-05 1981-05-05 DEVICE FOR THE PNEUMATIC CONVEYING OF FINE GOODS
DE3117748 1981-05-05

Publications (1)

Publication Number Publication Date
EP0078286A1 true EP0078286A1 (en) 1983-05-11

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EP (1) EP0078286A1 (en)
DE (1) DE3117748A1 (en)
ES (1) ES511918A0 (en)
WO (1) WO1982003844A1 (en)
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DE9114142U1 (en) * 1991-11-13 1993-03-11 Pct Powder Coating Technologies Gmbh, 7482 Krauchenwies, De
CN103771137A (en) * 2014-02-15 2014-05-07 苏州信文食品有限公司 Controllable feeding device

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DE333219C (en) * 1913-12-24 1921-02-18 Motala Verkst S Nya Aktiebolag Device for feeding ground fuel into furnaces
DE489541C (en) * 1927-01-09 1930-01-20 Zypen & Charlier G M B H V D Drainage regulating device on containers, especially those for dust or similar conveyed material
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Also Published As

Publication number Publication date
ES8307651A1 (en) 1983-08-01
ZA822999B (en) 1983-03-30
WO1982003844A1 (en) 1982-11-11
DE3117748A1 (en) 1982-12-02
ES511918A0 (en) 1983-08-01

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