EP0492541B1 - Method and apparatus for dewatering ashes - Google Patents

Method and apparatus for dewatering ashes Download PDF

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Publication number
EP0492541B1
EP0492541B1 EP91122011A EP91122011A EP0492541B1 EP 0492541 B1 EP0492541 B1 EP 0492541B1 EP 91122011 A EP91122011 A EP 91122011A EP 91122011 A EP91122011 A EP 91122011A EP 0492541 B1 EP0492541 B1 EP 0492541B1
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EP
European Patent Office
Prior art keywords
water
chute
slag
generator
discharge chute
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.)
Expired - Lifetime
Application number
EP91122011A
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German (de)
French (fr)
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EP0492541A3 (en
EP0492541A2 (en
Inventor
Walter J. Dipl.-Ing. Martin
Johannes J. E. Dipl.-Ing. Martin
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Martin GmbH fuer Umwelt und Energietechnik
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Martin GmbH fuer Umwelt und Energietechnik
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Publication date
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Publication of EP0492541A2 publication Critical patent/EP0492541A2/en
Publication of EP0492541A3 publication Critical patent/EP0492541A3/en
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Publication of EP0492541B1 publication Critical patent/EP0492541B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J1/00—Removing ash, clinker, or slag from combustion chambers
    • F23J1/02—Apparatus for removing ash, clinker, or slag from ash-pits, e.g. by employing trucks or conveyors, by employing suction devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
    • F23J2900/01021—Removing ashes from the ash pit using reciprocating means, e.g. pushers

Definitions

  • the invention relates to a method for dewatering slag which has been extinguished in the water bath of a detoxifier and which is pushed out of the water bath by means of an ejection piston via an ejection chute.
  • the invention also relates to an apparatus for performing the method. Such a method and such a device are known from document DE-A-2 539 615.
  • the burned-out fuel passes through a slag chute into a water purifier that has an arcuate curved discharge chute and a reciprocating discharge piston that transports the slag that has been removed from the water bath to the outside via the rising discharge chute (see e.g. DE-A 25 39 615).
  • a water purifier that has an arcuate curved discharge chute and a reciprocating discharge piston that transports the slag that has been removed from the water bath to the outside via the rising discharge chute (see e.g. DE-A 25 39 615).
  • the adhering water is partially released during subsequent transportation. This can lead to undesired water drainage from the means of transport and, since this water can be contaminated, can contribute to pollution of the environment or of the groundwater.
  • Another major problem is that the weight of the slag is correspondingly increased by the adhering water, as a result of which transportation and landfill costs increase considerably.
  • the object of the invention is to enable a largely dewatering of the slag coming from a furnace in the simplest possible way without additional cost-intensive systems.
  • this object is achieved according to the invention in that the discharge chute of the detoxifier is set in vibration. Particularly good results are achieved if, in a further embodiment of the invention, the water-free area of the extension chute is set in vibration.
  • the generation of vibrations which is transferred from the discharge chute to the slag located in the discharge chute, this is drained to a very great extent and, after the treatment according to the invention, only has a water content of about 12%, while slag which leaves the detoxifier without treatment according to the invention, has a water content of about 18 to 22%.
  • a significant amount of water is separated, which significantly reduces the consumption of fresh water or feed water.
  • the slag obtained after this treatment only feels moist to the earth and no longer has any dripping water adhering to it.
  • a vibration generator in particular an unbalance generator, is attached to the extension chute.
  • vibration generator in particular imbalance generator, is attached to the bottom of the extension chute.
  • vibration generator in particular unbalance generator, is connected to the boundary between the water-filled and the water-free part of the extension chute.
  • the slag chute 2 opens into an arch trough 3, on the bottom 4 of which a discharge piston 5 can be moved back and forth. With each stroke, the discharge piston 5 moves the slag resting on the floor 4 into the discharge chute 6, from which the slag finally reaches the outside.
  • the discharge plunger 5 is articulated at its rear end to one or more push cranks 7 which sit rotatably on a shaft 8 which is connected to a drive device, not shown.
  • the discharge piston 5 has an end face 9 which is substantially perpendicular to the bottom surface 4 of the bottom trough 3 and which serves to push out the slag.
  • the discharge piston 5 has a piston stage 10 which exerts an additional thrust effect.
  • the extension chute 6 is limited in its front, upper area by a rounded edge 11 which dips into the water bath located in the arch trough 3 in order to ensure an airtight closure of the slag chute, since there is negative pressure in the combustion chamber.
  • the water level is designated 12.
  • a vibration generator in the form of an unbalance generator 13 is provided on the bottom of the extension chute, which carries an unbalance weight 15 on a driven shaft 14, whereby the entire extension chute is set in vibration.
  • These vibrations are transferred to the slag and the water adhering to the slag, causing drainage of the slag in occurs to a high degree.
  • the separated water flows back into the water bath, so that apart from the arrangement of a vibration generator, no changes or additional devices have to be made.
  • the vibration generator 13 is in the preferred embodiment, which is shown in the drawing, at the boundary 16 designated between the water-filled part 17 and the water-free part 18 of the extension chute to the bottom 19 of the extension chute, so that the vibrations on the whole Extension chute and thus also transferred to the slag.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Furnace Details (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Processing Of Solid Wastes (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

Slag dewatering as ejected from a water bath by a pusher. The pusher chute (6) should be oscillated, pref., using a fitted disbalancing generator (13) on the chute base, pref. at the dividing line between water-filled (17) and water-free (18) parts if the chute (6).

Description

Die Erfindung bezieht sich auf ein Verfahren zum Entwässern von im Wasserbad eines Entschlackers abgelöschter Schlacke, die mittels eines Ausschubkolbens über eine Ausschubschurre aus dem Wasserbad herausgeschoben wird. Die Erfindung bezieht sich auch auf eine Vorrichtung zur Durchführung des Verfahrens. Ein solches Verfahren bzw. eine solche Vorrichtung sind aus Dokument DE-A- 2 539 615 bekannt.The invention relates to a method for dewatering slag which has been extinguished in the water bath of a detoxifier and which is pushed out of the water bath by means of an ejection piston via an ejection chute. The invention also relates to an apparatus for performing the method. Such a method and such a device are known from document DE-A-2 539 615.

Bei Feuerungsanlagen gelangt der ausgebrannte Brennstoff über einen Schlackenfallschacht in einen mit Wasser gefüllten Entschlacker, der eine bogenförmig gekrümmte Ausschubschurre und einen hin und her bewegbaren Ausschubkolben aufweist, der die im Wasserbad abgelöschte Schlacke über die ansteigende Ausschubschurre aus dem Wasserbad nach außen befördert (vgl. z.B. DE-A 25 39 615). Durch das Ablöschen der Schlacke im Wasserbad ist diese zwangsläufig mit Wasser vollgesaugt, wodurch sich bei der weiteren Behandlung bzw. der Entsorgung der Schlacke Probleme ergeben. Eines der Probleme besteht darin, daß das anhaftende Wasser, bei einem nachfolgenden Transport teilweise freigesetzt wird. Dies kann zu unerwünschtem Wasserablauf aus dem Transportmittel führen, und, da dieses Wasser mit Schadstoffen belastet sein kann, zur Belastung der Umwelt bzw. des Grundwassers beitragen. Ein weiteres wesentliches Problem besteht darin, daß durch das anhaftende Wasser das Gewicht der Schlacke entsprechend erhöht ist, wodurch Transport- und Deponiekosten erheblich ansteigen.In combustion plants, the burned-out fuel passes through a slag chute into a water purifier that has an arcuate curved discharge chute and a reciprocating discharge piston that transports the slag that has been removed from the water bath to the outside via the rising discharge chute (see e.g. DE-A 25 39 615). By quenching the slag in the water bath, it is inevitably soaked with water, which causes problems in the further treatment or disposal of the slag. One of the problems is that the adhering water is partially released during subsequent transportation. This can lead to undesired water drainage from the means of transport and, since this water can be contaminated, can contribute to pollution of the environment or of the groundwater. Another major problem is that the weight of the slag is correspondingly increased by the adhering water, as a result of which transportation and landfill costs increase considerably.

Aufgabe der Erfindung ist es auf eine möglichst einfache Weise ohne zusätzliche kostenintensiven Anlagen, eine weitgehende Entwässerung der aus einer Feuerungsanlage kommenden Schlacke zu ermöglichen.The object of the invention is to enable a largely dewatering of the slag coming from a furnace in the simplest possible way without additional cost-intensive systems.

Diese Aufgabe wird ausgehend von dem Verfahren der eingangs erläuterten Art erfindungsgemäß dadurch gelöst, daß die Ausschubschurre des Entschlackers in Schwingungen versetzt wird. Besonders gute Ergebnisse werden erzielt, wenn in weiterer Ausgestaltung der Erfindung der wasserfreie Bereich der Ausschubschurre in Schwingung versetzt wird. Durch die Schwingungserzeugung, die sich von der Ausschubschurre auf die in der Ausschubschurre befindliche Schlacke überträgt, wird diese sehr stark entwässert und weist nach der erfindungsgemäßen Behandlung nur noch einen Wassergehalt von etwa 12 % auf, während Schlacke, die ohne erfindungsgemäße Behandlung den Entschlacker verläßt, einen Wassergehalt von etwa 18 bis 22 % aufweist. Hierdurch wird eine erhebliche Menge an Wasser abgetrennt, was den Verbrauch an Frischwasser bzw. Zulaufwasser deutlich verringert. Die nach dieser Behandlung erhaltene Schlacke fühlt sich nur noch erdfeucht an und weist kein anhaftendes Tropfwasser mehr auf.Based on the method of the type described at the outset, this object is achieved according to the invention in that the discharge chute of the detoxifier is set in vibration. Particularly good results are achieved if, in a further embodiment of the invention, the water-free area of the extension chute is set in vibration. As a result of the generation of vibrations, which is transferred from the discharge chute to the slag located in the discharge chute, this is drained to a very great extent and, after the treatment according to the invention, only has a water content of about 12%, while slag which leaves the detoxifier without treatment according to the invention, has a water content of about 18 to 22%. As a result, a significant amount of water is separated, which significantly reduces the consumption of fresh water or feed water. The slag obtained after this treatment only feels moist to the earth and no longer has any dripping water adhering to it.

Zur Durchführung des Verfahrens genügt es, wenn erfindungsgemäß an der Ausschubschurre ein Schwingungsgenerator, insbesondere ein Unwuchterzeuger angebracht ist. Dies führt zu einer besonders einfachen Vorrichtung zur Durchführung des Verfahrens, denn an der bestehenden Anlage, d. h. an dem vorhandenen Entschlacker brauchen außer der Anordnung eines Schwingungsgenerators keinerlei Veränderungen vorgenommen zu werden, so daß bestehende Entschlacker in einfacher Weise nachgerüstet werden können.To carry out the method, it is sufficient if, according to the invention, a vibration generator, in particular an unbalance generator, is attached to the extension chute. This leads to a particularly simple device for implementation of the method, because no changes need be made to the existing system, ie to the existing detoxifier, except for the arrangement of a vibration generator, so that existing detoxifiers can be easily retrofitted.

Es hat sich gezeigt, daß es vorteilhaft ist, wenn der Schwingungserzeuger, insbesondere Unwuchterzeuger, am Boden der Ausschubschurre angebracht ist.It has been shown that it is advantageous if the vibration generator, in particular imbalance generator, is attached to the bottom of the extension chute.

Die besten Ergebnisse hinsichtlich der Entwässerung wurden dadurch erzielt, daß der Schwingungsgenerator, insbesondere Unwuchterzeuger, an der Grenze zwischen dem mit Wasser gefüllten und dem wasserfreien Teil der Ausschubschurre mit dieser verbunden ist.The best results with regard to dewatering were achieved in that the vibration generator, in particular unbalance generator, is connected to the boundary between the water-filled and the water-free part of the extension chute.

Die Erfindung wird nachstehend anhand eines Ausführungsbeispieles näher erläutert. In der Zeichnung zeigt die einzige Figur einen teilweisen Längsschnitt durch einen Entschlacker.The invention is explained in more detail below using an exemplary embodiment. In the drawing, the only figure shows a partial longitudinal section through a detoxifier.

Die von einem nicht dargestellten Feuerungsrost kommende Schlacke fällt in einen Schlackenfallschacht 2 eines Entschlackers 1. Der Schlackenfallschacht 2 mündet in eine Bogenwanne 3, auf deren Boden 4 ein Austragkolben 5 hin- und herbewegbar ist. Der Austragkolben 5 verschiebt bei jedem Hub die auf dem Boden 4 aufruhende Schlacke in die Ausschubschurre 6, aus der die Schlacke schließlich ins Freie gelangt.The slag coming from a furnace grate, not shown, falls into a slag chute 2 of a deslagger 1. The slag chute 2 opens into an arch trough 3, on the bottom 4 of which a discharge piston 5 can be moved back and forth. With each stroke, the discharge piston 5 moves the slag resting on the floor 4 into the discharge chute 6, from which the slag finally reaches the outside.

Der Austragkolben 5 ist an seinem hinteren Ende mit einer oder mehreren Schubkurbeln 7 gelenkig verbunden, die drehfest auf einer Welle 8 sitzen, die mit einer nicht dargestellen Antriebseinrichtung verbunden ist.The discharge plunger 5 is articulated at its rear end to one or more push cranks 7 which sit rotatably on a shaft 8 which is connected to a drive device, not shown.

Der Austragkolben 5 weist eine Stirnfläche 9 auf, die im wesentlichen senkrecht zur Bodenfläche 4 der Bodenwanne 3 steht und die zum Ausschieben der Schlacke dient. Im dargestellten Ausführungsbeispiel weist der Austragkolben 5 eine Kolbenstufe 10 auf, die eine zusätzliche Schubwirkung ausübt.The discharge piston 5 has an end face 9 which is substantially perpendicular to the bottom surface 4 of the bottom trough 3 and which serves to push out the slag. In the exemplary embodiment shown, the discharge piston 5 has a piston stage 10 which exerts an additional thrust effect.

Die Ausschubschurre 6 ist in ihrem vorderen, oberen Bereich durch eine abgerundete Kante 11 begrenzt, die in das in der Bogenwanne 3 befindliche Wasserbad eintaucht, um einen luftdichten Abschluß des Schlackenfallschachtes zu gewährleisten, da im Feuerraum Unterdruck herrscht. Der Wasserspiegel ist mit 12 bezeichnet.The extension chute 6 is limited in its front, upper area by a rounded edge 11 which dips into the water bath located in the arch trough 3 in order to ensure an airtight closure of the slag chute, since there is negative pressure in the combustion chamber. The water level is designated 12.

Die in der Bogenwanne 3 im Wasserbad abgelöschte Schlacke wird durch den Kolben mit dessen Stirnfläche 9 und der zusätzlichen Stufe 10 in die nach oben schräg ansteigende Ausschubschurre 6 geschoben und gelangt dort als kompakter Strang aus der Wasseroberfläche. Hier kann das äußerlich anhaftende Wasser in das Wasserbad zurückfließen.The slag extinguished in the arch trough 3 in the water bath is pushed by the piston with its end face 9 and the additional step 10 into the extension chute 6, which rises upwards at an angle and arrives there as a compact strand from the water surface. Here the externally adhering water can flow back into the water bath.

Zur Erzielung einer besonders guten Entwässerung der aus der Ausschubschurre 6 austretenden Schlacke ist am Boden der Ausschubschurre ein Schwingungsgenerator in Form eines Unwuchterzeugers 13 vorgesehen, der auf einer angetriebenen Welle 14 ein Unwuchtgewicht 15 trägt, wodurch die gesamte Ausschubschurre in Schwingungen versetzt wird. Diese Schwingungen übertragen sich auf die Schlacke und das der Schlacke anhaftende Wasser, wodurch eine Entwässerung der Schlacke in hohem Maße eintritt. Dabei fließt das abgetrennte Wasser wieder in das Wasserbad zurück, so daß außer der Anordnung eines Schwingungsgenerators keinerlei Veränderungen vorgenommen oder Zusatzeinrichtungen angebracht werden müssen. Der Schwingungsgenerator 13 ist bei dem bevorzugten Ausführungsbeispiel, das in der Zeichnung dargestellt ist, an der mit 16 bezeichneten Grenze zwischen dem wassergefüllten Teil 17 und dem wasserfreien Teil 18 der Ausschubschurre mit dem Boden 19 der Ausschubschurre fest verbunden, so daß die Schwingungen auf die gesamte Ausschubschurre und damit auch auf die Schlacke übertragen werden.In order to achieve a particularly good drainage of the slag emerging from the extension chute 6, a vibration generator in the form of an unbalance generator 13 is provided on the bottom of the extension chute, which carries an unbalance weight 15 on a driven shaft 14, whereby the entire extension chute is set in vibration. These vibrations are transferred to the slag and the water adhering to the slag, causing drainage of the slag in occurs to a high degree. The separated water flows back into the water bath, so that apart from the arrangement of a vibration generator, no changes or additional devices have to be made. The vibration generator 13 is in the preferred embodiment, which is shown in the drawing, at the boundary 16 designated between the water-filled part 17 and the water-free part 18 of the extension chute to the bottom 19 of the extension chute, so that the vibrations on the whole Extension chute and thus also transferred to the slag.

Claims (5)

  1. Method for dewatering ashes quenched in the water bath of an ash-removing device, said ashes being ejected from the water bath by means of a discharge piston via a discharge chute, characterised in that the discharge chute of the ash-removing device is oscillated.
  2. Method according to claim 1, characterised in that the water-free region of the discharge chute is oscillated.
  3. Apparatus for carrying out the method according to claim 1 or claim 2, characterised in that an oscillation generator (13), especially an unbalance-type generator, is mounted on the discharge chute (6).
  4. Apparatus according to claim 3, characterised in that the oscillation generator (13), especially an unbalance-type generator, is mounted on the bottom (19) of the discharge chute (6).
  5. Apparatus according to claim 3 or claim 4, characterised in that the oscillation generator (13), especially an unbalance-type generator, is connected to the discharge chute (6) at the boundary between the water-filled part (17) and the water-free part (18) thereof.
EP91122011A 1990-12-21 1991-12-20 Method and apparatus for dewatering ashes Expired - Lifetime EP0492541B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4041381 1990-12-21
DE4041381A DE4041381C1 (en) 1990-12-21 1990-12-21 Slag dewatering chute - has water acting as pusher with fitted disbalancing generator

Publications (3)

Publication Number Publication Date
EP0492541A2 EP0492541A2 (en) 1992-07-01
EP0492541A3 EP0492541A3 (en) 1992-12-16
EP0492541B1 true EP0492541B1 (en) 1994-06-01

Family

ID=6421167

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91122011A Expired - Lifetime EP0492541B1 (en) 1990-12-21 1991-12-20 Method and apparatus for dewatering ashes

Country Status (8)

Country Link
EP (1) EP0492541B1 (en)
JP (1) JP2581629B2 (en)
AT (1) ATE106526T1 (en)
BR (1) BR9105439A (en)
CA (1) CA2058282C (en)
DE (2) DE4041381C1 (en)
DK (1) DK0492541T3 (en)
ES (1) ES2056559T3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2721992A1 (en) * 1994-07-01 1996-01-05 Rech Dev Indls Method of cooling shredded domestic refuse from incinerator
DE19830943B4 (en) * 1998-07-10 2010-09-09 Hitachi Power Europe Gmbh Process for dewatering ash

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2031988A1 (en) * 1970-06-29 1972-01-05 Deutsche Babcock & Wilcox Ag, 4200 Oberhausen Plate conveyor for wet slag
FR2323102A1 (en) * 1975-09-05 1977-04-01 Martin Johannes Josef WASTE EVACUATION DEVICE FOR LARGE FIREPLACES
JPS5926993B2 (en) * 1976-06-30 1984-07-02 松下電工株式会社 Evacuation guidance method
JPS5995198A (en) * 1982-11-24 1984-06-01 株式会社　尾「さこ」製作所 Monitor device for stacked folded section in intermediate binder
US4843732A (en) * 1987-12-29 1989-07-04 The Cardwell Machine Company Vibratory and gas levitation particle treatment system

Also Published As

Publication number Publication date
ATE106526T1 (en) 1994-06-15
DK0492541T3 (en) 1994-09-26
DE59101799D1 (en) 1994-07-07
EP0492541A3 (en) 1992-12-16
CA2058282C (en) 1998-08-25
EP0492541A2 (en) 1992-07-01
ES2056559T3 (en) 1994-10-01
JP2581629B2 (en) 1997-02-12
DE4041381C1 (en) 1992-01-09
CA2058282A1 (en) 1992-06-22
BR9105439A (en) 1992-08-25
JPH04267911A (en) 1992-09-24

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