EP0384108B1 - Process and apparatus for cleaning metal parts - Google Patents

Process and apparatus for cleaning metal parts Download PDF

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Publication number
EP0384108B1
EP0384108B1 EP90100356A EP90100356A EP0384108B1 EP 0384108 B1 EP0384108 B1 EP 0384108B1 EP 90100356 A EP90100356 A EP 90100356A EP 90100356 A EP90100356 A EP 90100356A EP 0384108 B1 EP0384108 B1 EP 0384108B1
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EP
European Patent Office
Prior art keywords
furnace
plant
metal parts
carbonising
cleaning plant
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EP90100356A
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German (de)
French (fr)
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EP0384108A1 (en
Inventor
Erich Krämer
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Individual
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/28—Cleaning or pickling metallic material with solutions or molten salts with molten salts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44D—PAINTING OR ARTISTIC DRAWING, NOT OTHERWISE PROVIDED FOR; PRESERVING PAINTINGS; SURFACE TREATMENT TO OBTAIN SPECIAL ARTISTIC SURFACE EFFECTS OR FINISHES
    • B44D3/00—Accessories or implements for use in connection with painting or artistic drawing, not otherwise provided for; Methods or devices for colour determination, selection, or synthesis, e.g. use of colour tables
    • B44D3/16—Implements or apparatus for removing dry paint from surfaces, e.g. by scraping, by burning
    • B44D3/166—Implements or apparatus for removing dry paint from surfaces, e.g. by scraping, by burning by heating, e.g. by burning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/027—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage
    • F23G5/0276—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage using direct heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44—Details; Accessories
    • F23G5/46—Recuperation of heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2201/00—Pretreatment
    • F23G2201/30—Pyrolysing
    • F23G2201/303—Burning pyrogases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2201/00—Pretreatment
    • F23G2201/30—Pyrolysing
    • F23G2201/304—Burning pyrosolids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2201/00—Pretreatment
    • F23G2201/50—Devolatilising; from soil, objects

Definitions

  • the invention relates to a method for operating a system for removing paint or varnish coatings from metal parts and with a system for removing paint or varnish coatings from metal parts.
  • metal parts are, for example, hangers, gratings, workpieces or the like.
  • hangers, gratings or the like are used, for example, as a supporting device for workpieces in powder coating or painting, in particular according to the continuous process.
  • US-A-4 284 428 is concerned with the separation of contaminating material from copper wires and cables.
  • the insulation of such wires and cables and other materials, such as solder or the like, is removed before the copper material is reprocessed.
  • the material to be treated is placed directly in a salt bath with a predetermined composition. Burn-off treatment is not carried out.
  • paint or varnish coatings are removed from metal parts using a smoldering furnace to burn off the coating.
  • the paint or varnish coatings fade in the smoldering furnace at a temperature of around 350 to 550 ° C.
  • the resulting carbonization gases cannot be discharged directly into the atmosphere, but are thermally burned at a temperature of around 750 to 850 ° C.
  • the metal parts treated in this way can then be finally cleaned in a post-cleaning system.
  • a salt bath can be used for this purpose, which can have a temperature of approximately 300 to 550 ° C.
  • the invention has for its object to provide a method for operating a system for removing paint or varnish coatings from metal parts and a system for removing paint or varnish coatings from metal parts, which allow energy-saving removal of paint or varnish coatings from metal parts.
  • the smoldering gases resulting from the smoldering furnace treatment are used after heating for post-combustion to heat a post-cleaning system, so that these afterburned smoldering gases are not emitted directly to the atmosphere, but rather the heat content thereof to achieve an energy-saving removal of paint or lacquer coatings is used by metal parts.
  • Salt bath treatment is preferably considered as a post-cleaning system.
  • Figure 1 shows only schematically a smoldering furnace 10 with a grate 12 on which the material to be treated 16 is arranged.
  • This material 16 can be hangers, grids or the like of a powder coating system or a painting system or the like, which are covered with paint residues or powder residues or paint residues and encrusted and are to be cleaned.
  • the smoldering furnace 10 is provided with a burner 18, for example an oil burner, which brings the temperature in the smoldering furnace 10 to approximately 250 ° C. At about this temperature, the paint and paint residues on the devices 16 to be cleaned begin to smolder or burn, this combustion maintaining itself and the burner 18 can therefore be switched off.
  • the temperature in the smoldering furnace 10 is usually in the range of about 350-550 ° C.
  • the carbonizing gases which develop cannot be introduced directly into the atmosphere, but rather enter a post-combustion chamber 20 and are thermally post-burned there at a temperature of approximately 750 to 850 ° C. by means of a burner 22 installed in the post-combustion chamber 20 , which can also be an oil burner.
  • a valve or flap 28 is installed in the pipeline 24, 26, through which the exhaust gas flow from the pipeline 24 is either conducted into the pipeline 26 and thus to the salt bath furnace 32 or directly to a chimney 30, from which the exhaust gases are then released into the atmosphere emerge.
  • the latter is the case, for example, when the salt bath furnace 32 is not in operation.
  • the connection from the pipe 24 to the chimney 30 is closed and the connection from the pipe 24 to the pipe 26 is opened, so that the hot exhaust gases from the afterburning chamber 20 enter the salt bath furnace 32 and a crucible or salt bath container arranged there Flow around 34.
  • the salt bath container 34 can, for example, stand on only schematically indicated feet 36, such that the hot exhaust gases can flow around the container 34 both on the sides and on the bottom.
  • the salt bath furnace 32 is provided with suitable partition walls, of which, for example, a partition wall 42 is shown in order to ensure that the hot exhaust gases flow completely around the salt bath container 34 and cannot flow directly from the line 26 to a connecting pipeline 38 which the salt bath furnace 32 also has connects the fireplace 30.
  • the hot exhaust gases from the afterburning chamber 20 thus flow around the salt bath container 34 practically on all sides and then flow out of the salt bath furnace 32 via the connecting line 38 to the chimney 30 and then to the atmosphere.
  • a check valve 40 can be installed in line 38 to prevent the hot exhaust gases from the chimney 30 from entering the pipeline 38 and thus into the salt bath furnace 32 when the latter is not in operation and the exhaust gases from the line 24 directly Stream to the fireplace 30.
  • the salt bath furnace 32 can be equipped with additional heating, e.g. a heating burner 52, to heat the salt bath furnace or to operate it when there are no hot exhaust gases from the afterburning chamber 20 available.
  • additional heating e.g. a heating burner 52
  • the temperature of the salt bath is in the range from 300 to 550 ° C. and this temperature in the salt bath can be reached and maintained by the hot exhaust gases from the afterburning chamber 20.
  • FIG. 2 shows a modification of the plant according to FIG. 1, in which case the smoldering furnace 10 is coupled directly to the salt bath furnace 32 via a connecting pipeline 44.
  • a valve in this case a double valve 46, is installed in the salt bath furnace itself, which is shown only schematically in the drawing, through which either a valve opening 48 or a valve opening 50 can be opened, the respective other valve opening then being closed.
  • the valve opening 48 is opened, as a result of which the hot exhaust gases from the afterburning chamber 20, which flow into the salt bath furnace 32 via the pipeline 44, around the salt bath container 34 are guided around, after which they emerge through the chimney 30 to the atmosphere.
  • the valve opening 50 is closed, so that there is no direct connection from the pipe 44 to the chimney 30.
  • the valve opening 48 is closed, but the valve opening 50 is open, so that in this valve position the hot exhaust gases from the pipeline 44 flow directly to the chimney 30 via the valve opening 50 and thus escape into the atmosphere. without flowing around and heating the salt bath container 34. This is the case, for example, when the salt bath furnace 32 is not in operation, or when, for example, the temperature of the salt bath is high enough and further heating is not necessary.
  • both systems according to FIGS. 1 and 2 can be provided with suitable temperature sensors and a corresponding control device in order to control the flap 28 and the valve 46 accordingly.
  • salt bath instead of the salt bath, other post-cleaning systems can also be used, e.g. a fluidized bed stripping, in which case the smoldering furnace is combined with the fluidized bed stripping and the exhaust gases from the afterburning are used to heat the fluidized bed system.
  • a fluidized bed stripping in which case the smoldering furnace is combined with the fluidized bed stripping and the exhaust gases from the afterburning are used to heat the fluidized bed system.
  • the method can also be used in reverse in some cases, e.g. If the burner of the salt bath furnace is in operation anyway, the waste heat or the exhaust gases from the salt bath furnace can be used to heat the smoldering furnace.
  • the salt bath furnace 32 can be provided with a heating burner 52.
  • a such an embodiment is shown in FIG. 3.
  • the thermal afterburning of the carbonization gases from the carbonization furnace 10 can take place in the salt bath furnace 32 itself.
  • the carbonization gases are then introduced from the carbonization furnace 10 via the pipeline 26 into the salt bath furnace 32 and there the afterburning takes place with the aid of the heating burner 52.
  • the exhaust gases from the afterburning flow around the salt bath container 34 and contribute to heating it up to the desired bath temperature.
  • This embodiment offers the advantage that the salt bath furnace 32 can be heated at the same time and the carbonization gases from the carbonization furnace 10 can be afterburned.
  • the salt bath furnace room also forms the afterburning room.
  • the carbonization gases from the furnace 10 can thus either be re-burned internally with the help of the burner 22, as already described above, or they can be re-burned externally with the help of the burner 52 in the furnace space of the salt bath furnace 32, in which case, if necessary, the burner 22 can be dispensed with, or a combined mode of operation is possible, ie internal and external post-combustion using both burners 22 and 52, which has the advantage that the carbonization furnace 10 can receive a greater load with carbonization material 16 to be processed, particularly in the initial stage .
  • the furnace space of the salt bath furnace 32 is expediently connected to the chimney 30 via a branch pipeline 54, which makes it possible to introduce part of the post-combustion exhaust gases directly into the chimney without this part of the exhaust gases flowing around the salt bath container 34. in order to avoid possible overheating of the salt bath container 34.
  • the pipeline 34 is expedient on its input side provided with a suitable flap 56, and it can also be provided on its outlet side in the chimney 30 with a flap 58 which prevents the entry of gases or air from the chimney 30 into the pipeline 54.
  • Such a branch line for the direct discharge of part of the afterburning exhaust gases can optionally also be installed inside the furnace space of the salt bath furnace 32, which can then be connected directly to the connecting pipeline 38 (not shown).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Incineration Of Waste (AREA)

Description

Die Erfindung befaßt sich mit einem Verfahren zum Betreiben einer Anlage zum Entfernen von Farb- oder Lacküberzügen von Metallteilen sowie mit einer Anlage zum Entfernen von Farb- oder Lacküberzügen von Metallteilen. Derartige Metallteile sind beispielsweise Gehänge, Gitterroste, Werkstücke oder dergleichen. Derartige Gehänge, Gitterroste oder dergleichen werden beispielsweise als eine Trageinrichtung für Werkstücke beim Pulverbeschichten oder Lackieren insbesondere nach dem Durchlaufverfahren eingesetzt.The invention relates to a method for operating a system for removing paint or varnish coatings from metal parts and with a system for removing paint or varnish coatings from metal parts. Such metal parts are, for example, hangers, gratings, workpieces or the like. Such hangers, gratings or the like are used, for example, as a supporting device for workpieces in powder coating or painting, in particular according to the continuous process.

Aus EP-A-0 253 596 sind ein Verfahren und eine Anlage zum Trocknen von eisenhaltigen oder nicht eisenhaltigen Spänematerialien bekannt, welche mit flüchtigen Stoffen, wie Öl oder dergleichen behaftet sind. Dieses Spänematerial wird in einem Drehrohrofen mit einer Trommel mit Hilfe von heißen Gasen getrocknet, welche dann in der Trommel nach Verdampfen der flüchtigen Bestandteile auf dem Spänematerial gezündet und anschließend nachverbrannt werden. Hierbei kann ein Brenner eingesetzt werden, welcher die Abgase aus der Trockenkammer zur Erzeugung von Wärme für den erforderlichen Heißgasstrom in der Trockenkammer nach der Anlaufphase nutzen kann. Dieser Brenner verbrennt den Gasstrom mit flüchtigen brennbaren, bei der Trocknung verdampften Bestandteilen und erzeugt Heißgase, welche zur Trocknung des eingebrachten Spänematerials eingesetzt werden. Eine Nachreinigung erfolgt hierbei nicht, sondern das Verfahren und die Anlage zum Trocknen bildet ein einstufiges, geschlossenes System.From EP-A-0 253 596 a method and a plant for drying iron-containing or non-iron-containing chip materials are known, which are associated with volatile substances such as oil or the like. This chip material is dried in a rotary kiln with a drum with the help of hot gases, which are then ignited in the drum after the volatile constituents have evaporated on the chip material and are subsequently burned. Here, a burner can be used, which can use the exhaust gases from the drying chamber to generate heat for the required hot gas flow in the drying chamber after the start-up phase. This burner burns the gas stream with volatile, flammable components that evaporate during drying and generates hot gases that are used to dry the chip material that is introduced. Post-cleaning is not carried out here, but the process and the drying plant form a single-stage, closed system.

Die US-A-4 284 428 befaßt sich mit der Trennung von kontaminierendem Material von Kupferdrähten und Kabeln. Hierbei wird die Isolierung von derartigen Drähten und Kabeln sowie weiteren Materialen, wie Lot oder dergleichen entfernt, bevor eine Wiederaufbereitung des Kupfermaterials erfolgt. Das zu behandelnde Gut wird direkt in ein Salzbad mit einer vorbestimmten Zusammensetzung eingebracht. Eine Abbrennbehandlung wird nicht durchgeführt.US-A-4 284 428 is concerned with the separation of contaminating material from copper wires and cables. In this case, the insulation of such wires and cables and other materials, such as solder or the like, is removed before the copper material is reprocessed. The material to be treated is placed directly in a salt bath with a predetermined composition. Burn-off treatment is not carried out.

Nach betriebsinternen Kenntnissen werden Farb- oder Lacküberzüge von Metallteilen unter Einsatz eines Schwelofens zum Abbrennen des Überzugs entfernt. Die Farb- oder Lacküberzüge verschwelen in dem Schwelofen bei einer Temperatur von etwa 350 bis 550°C. Die hierbei entstehenden Schwelgase können aus Gründen des Umweltschutzes nicht direkt in die Atmosphäre abgeleitet werden, sondern sie werden thermisch mit einer Temperatur von etwa 750 bis 850°C nachverbrannt. Nach dieser Schwelofenbehandlung können dann die so behandelten Metallteile in einer Nachreinigungsanlage endgereinigt werden. Hierzu kann beispielsweise ein Salzbad genutzt werden, das eine Temperatur von etwa 300 bis 550°C haben kann.According to in-house knowledge, paint or varnish coatings are removed from metal parts using a smoldering furnace to burn off the coating. The paint or varnish coatings fade in the smoldering furnace at a temperature of around 350 to 550 ° C. For reasons of environmental protection, the resulting carbonization gases cannot be discharged directly into the atmosphere, but are thermally burned at a temperature of around 750 to 850 ° C. After this smoldering treatment, the metal parts treated in this way can then be finally cleaned in a post-cleaning system. For example, a salt bath can be used for this purpose, which can have a temperature of approximately 300 to 550 ° C.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Betreiben einer Anlage zum Entfernen von Farb- oder Lacküberzügen von Metallteilen sowie eine Anlage zum Entfernen von Farb- oder Lacküberzügen von Metallteilen bereitzustellen, welche eine energiesparende Entfernung von Farb- oder Lacküberzügen von Metallteilen gestatten.The invention has for its object to provide a method for operating a system for removing paint or varnish coatings from metal parts and a system for removing paint or varnish coatings from metal parts, which allow energy-saving removal of paint or varnish coatings from metal parts.

Hierzu wird nach der Erfindung einerseits ein Verfahren zum Betreiben einer Anlage zum Entfernen von Farb- oder Lacküberzügen von Metallteilen angegeben, welches Gegenstand des Patentanspruchs 1 ist.For this purpose, according to the invention, a method for operating a system for removing paint or varnish coatings from metal parts is specified, which is the subject of claim 1.

Zum anderen wird nach der Erfindung eine Anlage zum Entfernen von Farb- oder Lacküberzügen von Metallteilen angegeben, welche Gegenstand des Patentanspruchs 5 ist.On the other hand, according to the invention a system for removing paint or varnish coatings from metal parts is specified, which is the subject of claim 5.

Beim erfindungsgemäßen Verfahren und bei der erfindungsgemäßen Anlage werden die bei der Schwelofenbehandlung anfallenden Schwelgase nach einer Nachverbrennung zur Beheizung einer Nachreinigungsanlage genutzt, so daß diese nachverbrannten Schwelgase nicht unmittelbar zur Atmosphäre abgegeben werden, sondern der Wärmeinhalt derselben zur Erzielung einer energiesparenden Entfernung von Farb- oder Lacküberzügen von Metallteilen genutzt wird.In the process according to the invention and in the plant according to the invention, the smoldering gases resulting from the smoldering furnace treatment are used after heating for post-combustion to heat a post-cleaning system, so that these afterburned smoldering gases are not emitted directly to the atmosphere, but rather the heat content thereof to achieve an energy-saving removal of paint or lacquer coatings is used by metal parts.

In bevorzugter Weise kommt als eine Nachreinigungsanlage eine Salzbadbehandlung in Betracht.Salt bath treatment is preferably considered as a post-cleaning system.

Weitere, vorteilhafte Ausgestaltungen der Erfindung sind in den Ansprüche 2 bis 4 und 6 bis 10 wiedergegeben.Further advantageous embodiments of the invention are given in claims 2 to 4 and 6 to 10.

Beispielsweise Ausführungsformen der Erfindung werden nachfolgend anhand der Zeichnung erläutert, in der

Figur 1
schematisch einen Schwelofen mit angekoppeltem Salzbadofen zeigt.
Figur 2
zeigt eine modifizierte Ausführungsform der Kupplung zwischen Schwelofen und Salzbadofen.
Figur 3
zeigt eine modifizierte Ausführungsform des Schwelofens mit angekoppeltem Salzbadofen.
For example, embodiments of the invention are explained below with reference to the drawing, in which
Figure 1
schematically shows a smoldering furnace with a coupled salt bath furnace.
Figure 2
shows a modified embodiment of the coupling between smoldering furnace and salt bath furnace.
Figure 3
shows a modified embodiment of the smoldering furnace with coupled salt bath furnace.

Figur 1 zeigt nur schematisch einen Schwelofen 10 mit einem Rost 12, auf welchem das zu behandelnde Gut 16 angeordnet ist. Dieses Gut 16 können Gehänge, Roste oder dergleichen einer Pulverbeschichtungsanlage oder einer Lackieranlage oder dergleichen sein, die mit Lackresten oder Pulverresten bzw. Farbresten behaftet und verkrustet sind und gereinigt werden sollen.Figure 1 shows only schematically a smoldering furnace 10 with a grate 12 on which the material to be treated 16 is arranged. This material 16 can be hangers, grids or the like of a powder coating system or a painting system or the like, which are covered with paint residues or powder residues or paint residues and encrusted and are to be cleaned.

Der Schwelofen 10 ist mit einem Brenner 18, z.B. einem Ölbrenner, versehen, der die Temperatur im Schwelofen 10 auf etwa 250°C bringt. Etwa bei dieser Temperatur beginnen die Lack- und Farbreste an den zu reinigenden Geräten 16 zu verschwelen bzw. zu verbrennen, wobei sich diese Verbrennung selbst aufrecht erhält und der Brenner 18 deshalb abgeschaltet werden kann. Die Temperatur im Schwelofen 10 liegt gewöhnlich im Bereich von etwa 350-550°C. Die sich entwickelnden Schwelgase können aber aus Gründen des Umweltschutzes nicht direkt in die Atmosphäre eingeführt werden, sondern sie treten in eine Nachbrennkammer 20 ein und werden dort bei einer Temperatur von etwa 750 bis 850°C thermisch nachverbrannt mittels eines in der Nachbrennkammer 20 installierten Brenners 22, der ebenfalls ein Ölbrenner sein kann.The smoldering furnace 10 is provided with a burner 18, for example an oil burner, which brings the temperature in the smoldering furnace 10 to approximately 250 ° C. At about this temperature, the paint and paint residues on the devices 16 to be cleaned begin to smolder or burn, this combustion maintaining itself and the burner 18 can therefore be switched off. The temperature in the smoldering furnace 10 is usually in the range of about 350-550 ° C. However, for reasons of environmental protection, the carbonizing gases which develop cannot be introduced directly into the atmosphere, but rather enter a post-combustion chamber 20 and are thermally post-burned there at a temperature of approximately 750 to 850 ° C. by means of a burner 22 installed in the post-combustion chamber 20 , which can also be an oil burner.

Die Abgase aus der Nachbrennkammer 20, die also eine Temperatur von etwa 750-850°C haben, werden nun über eine Rohrleitung 24, 26 zu einem Salzbadofen 32 geleitet.The exhaust gases from the afterburning chamber 20, which therefore have a temperature of approximately 750-850 ° C., are now conducted via a pipeline 24, 26 to a salt bath furnace 32.

In die Rohrleitung 24, 26 ist ein Ventil oder eine Klappe 28 eingebaut, durch welche der Abgasstrom aus der Rohrleitung 24 entweder in die Rohrleitung 26 und damit zum Salzbadofen 32 oder direkt zu einem Kamin 30 geleitet wird, aus welchem die Abgase dann in die Atmosphäre austreten. Das letztere ist beispielsweise dann der Fall, wenn der Salzbadofen 32 nicht in Betrieb ist.A valve or flap 28 is installed in the pipeline 24, 26, through which the exhaust gas flow from the pipeline 24 is either conducted into the pipeline 26 and thus to the salt bath furnace 32 or directly to a chimney 30, from which the exhaust gases are then released into the atmosphere emerge. The latter is the case, for example, when the salt bath furnace 32 is not in operation.

Im Betrieb des Salzbadofens 32 ist jedoch die Verbindung von der Rohrleitung 24 zum Kamin 30 geschlossen und die Verbindung von der Rohrleitung 24 zur Rohrleitung 26 geöffnet, so daß die heißen Abgase aus der Nachbrennkammer 20 in den Salzbadofen 32 eintreten und einen dort angeordneten Tiegel oder Salzbadbehälter 34 umströmen. Der Salzbadbehälter 34 kann beispielsweise auf nur schematisch angedeuteten Füßen 36 stehen, derart, daß die heißen Abgase den Behälter 34 sowohl an den Seiten wie auch am Boden umströmen können. Der Salzbadofen 32 ist mit geeigneten Zwischenwänden versehen, von denen beispielsweise eine Zwischenwand 42 dargestellt ist, um zu gewährleisten, daß die heißen Abgase den Salzbadbehälter 34 vollständig umströmen und nicht aus der Leitung 26 direkt zu einer Verbindungsrohrleitung 38 strömen können, die den Salzbadofen 32 mit dem Kamin 30 verbindet.In operation of the salt bath furnace 32, however, the connection from the pipe 24 to the chimney 30 is closed and the connection from the pipe 24 to the pipe 26 is opened, so that the hot exhaust gases from the afterburning chamber 20 enter the salt bath furnace 32 and a crucible or salt bath container arranged there Flow around 34. The salt bath container 34 can, for example, stand on only schematically indicated feet 36, such that the hot exhaust gases can flow around the container 34 both on the sides and on the bottom. The salt bath furnace 32 is provided with suitable partition walls, of which, for example, a partition wall 42 is shown in order to ensure that the hot exhaust gases flow completely around the salt bath container 34 and cannot flow directly from the line 26 to a connecting pipeline 38 which the salt bath furnace 32 also has connects the fireplace 30.

Die heißen Abgase aus der Nachbrennkammer 20 umströmen somit den Salzbadbehälter 34 praktisch allseitig und strömen dann aus dem Salzbadöfen 32 über die Verbindungsleitung 38 zum Kamin 30 und dann zur Atmosphäre ab.The hot exhaust gases from the afterburning chamber 20 thus flow around the salt bath container 34 practically on all sides and then flow out of the salt bath furnace 32 via the connecting line 38 to the chimney 30 and then to the atmosphere.

In die Leitung 38 kann eine Rückschlagklappe 40 eingebaut sein, um zu verhindern, daß die heißen Abgase aus dem Kamin 30 in die Rohrleitung 38 und damit in den Salzbadofen 32 eintreten, wenn der letztere nicht in Betrieb ist und die Abgase aus der Leitung 24 direkt zum Kamin 30 strömen.A check valve 40 can be installed in line 38 to prevent the hot exhaust gases from the chimney 30 from entering the pipeline 38 and thus into the salt bath furnace 32 when the latter is not in operation and the exhaust gases from the line 24 directly Stream to the fireplace 30.

Der Salzbadofen 32 kann mit einer Zusatzheizung, z.B. einem Aufheizbrenner 52, versehen sein, um den Salzbadofen anzuheizen oder um ihn zu betreiben, wenn keine heißen Abgase aus der Nachbrennkammer 20 zur Verfügung stehen.The salt bath furnace 32 can be equipped with additional heating, e.g. a heating burner 52, to heat the salt bath furnace or to operate it when there are no hot exhaust gases from the afterburning chamber 20 available.

Die Temperatur des Salzbades liegt im Bereich von 300 bis 550°C und diese Temperatur im Salzbad kann durch die heißen Abgase aus der Nachbrennkammer 20 erreicht und aufrechterhalten werden.The temperature of the salt bath is in the range from 300 to 550 ° C. and this temperature in the salt bath can be reached and maintained by the hot exhaust gases from the afterburning chamber 20.

Im Normalfall ist daher eine Fremdbeheizung des Salzbadofens 32 nicht erforderlich, wobei beträchtliche Energiemengen eingespart werden können.In the normal case, external heating of the salt bath furnace 32 is therefore not necessary, and considerable amounts of energy can be saved.

Figur 2 zeigt eine Modifikation der Anlage nach Figur 1, wobei hier der Schwelofen 10 direkt über eine Verbindungsrohrleitung 44 mit dem Salzbadofen 32 gekoppelt ist. In den Salzbadofen selbst ist, was in der Zeichnung nur schematisch dargestellt ist, ein Ventil, in diesem Fall ein Doppelventil 46, eingebaut, durch welches entweder eine Ventilöffnung 48 oder eine Ventilöffnung 50 geöffnet werden kann, wobei dann die jeweils andere Ventilöffnung geschlossen ist.FIG. 2 shows a modification of the plant according to FIG. 1, in which case the smoldering furnace 10 is coupled directly to the salt bath furnace 32 via a connecting pipeline 44. A valve, in this case a double valve 46, is installed in the salt bath furnace itself, which is shown only schematically in the drawing, through which either a valve opening 48 or a valve opening 50 can be opened, the respective other valve opening then being closed.

In der dargestellten Ausführungsform ist die Ventilöffnung 48 geöffnet, wodurch die heißen Abgase aus der Nachbrennkammer 20, die über die Rohrleitung 44 in den Salzbadofen 32 einströmen, um den Salzbadbehälter 34 herumgeführt werden, wonach sie durch den Kamin 30 zur Atmosphäre austreten. Die Ventilöffnung 50 ist hierbei geschlossen, so daß keine direkte Verbindung von der Rohrleitung 44 zum Kamin 30 besteht. In der anderen, nicht dargestellten Position des Doppelventils 46 ist die Ventilöffnung 48 geschlossen, hingegen die Ventilöffnung 50 geöffnet, so daß in dieser Ventilstellung die heißen Abgase aus der Rohrleitung 44 über die Ventilöffnung 50 direkt zum Kamin 30 strömen und damit in die Atmosphäre austreten, ohne den Salzbadbehälter 34 zu umströmen und zu beheizen. Dies ist z.B. dann der Fall, wenn der Salzbadofen 32 nicht in Betrieb ist, oder wenn beispielsweise die Temperatur des Salzbades hoch genug ist und eine weitere Beheizung nicht erforderlich ist.In the illustrated embodiment, the valve opening 48 is opened, as a result of which the hot exhaust gases from the afterburning chamber 20, which flow into the salt bath furnace 32 via the pipeline 44, around the salt bath container 34 are guided around, after which they emerge through the chimney 30 to the atmosphere. The valve opening 50 is closed, so that there is no direct connection from the pipe 44 to the chimney 30. In the other position, not shown, of the double valve 46, the valve opening 48 is closed, but the valve opening 50 is open, so that in this valve position the hot exhaust gases from the pipeline 44 flow directly to the chimney 30 via the valve opening 50 and thus escape into the atmosphere. without flowing around and heating the salt bath container 34. This is the case, for example, when the salt bath furnace 32 is not in operation, or when, for example, the temperature of the salt bath is high enough and further heating is not necessary.

Beide Anlagen nach den Figuren 1 und 2 können zu diesem Zweck mit geeigneten Temperatursensoren und einer entsprechenden Regeleinrichtung versehen sein, um die Klappe 28 bzw. das Ventil 46 entsprechend zu steuern.For this purpose, both systems according to FIGS. 1 and 2 can be provided with suitable temperature sensors and a corresponding control device in order to control the flap 28 and the valve 46 accordingly.

Anstelle des Salzbades können auch andere Nachreinigungsanlagen verwendet werden, z.B. eine Wirbelbettentlackung, wobei in diesem Fall der Schwelofen mit der Wirbelbettentlackung kombiniert wird und die Abgase aus der Nachverbrennung zur Beheizung der Wirbelbettanlage verwendet werden.Instead of the salt bath, other post-cleaning systems can also be used, e.g. a fluidized bed stripping, in which case the smoldering furnace is combined with the fluidized bed stripping and the exhaust gases from the afterburning are used to heat the fluidized bed system.

Das Verfahren kann in manchen Fällen auch umgekehrt angewendet werden, z.B. wenn der Brenner des Salzbadofens ohnehin in Betrieb ist, kann die Abwärme bzw. können die Abgase aus dem Salzbadofen zur Beheizung des Schwelofens verwendet werden.The method can also be used in reverse in some cases, e.g. If the burner of the salt bath furnace is in operation anyway, the waste heat or the exhaust gases from the salt bath furnace can be used to heat the smoldering furnace.

Es wurde bereits oben erwähnt, daß der Salzbadofen 32 mit einem Aufheizbrenner 52 versehen sein kann. Eine solche Ausführungsform ist in Figur 3 dargestellt. Bei dieser Ausführungsform kann die thermische Nachverbrennung der Schwelgase aus dem Schwelofen 10 im Salzbadofen 32 selbst erfolgen. Die Schwelgase werden dann vom Schwelofen 10 über die Rohrleitung 26 in den Salzbadofen 32 eingeführt und dort erfolgt die Nachverbrennung mit Hilfe des Aufheizbrenners 52. Die Abgase aus der Nachverbrennung umströmen den Salzbadbehälter 34 und tragen dazu bei, diesen auf die gewünschte Badtemperatur aufzuheizen.It has already been mentioned above that the salt bath furnace 32 can be provided with a heating burner 52. A such an embodiment is shown in FIG. 3. In this embodiment, the thermal afterburning of the carbonization gases from the carbonization furnace 10 can take place in the salt bath furnace 32 itself. The carbonization gases are then introduced from the carbonization furnace 10 via the pipeline 26 into the salt bath furnace 32 and there the afterburning takes place with the aid of the heating burner 52. The exhaust gases from the afterburning flow around the salt bath container 34 and contribute to heating it up to the desired bath temperature.

Diese Ausführungsform bietet den Vorteil, daß gleichzeitig der Salzbadofen 32 beheizt und die Schwelgase aus dem Schwelofen 10 nachverbrannt werden können. Der Salzbadofenraum bildet in diesem Fall gleichzeitig den Nachverbrennungsraum.This embodiment offers the advantage that the salt bath furnace 32 can be heated at the same time and the carbonization gases from the carbonization furnace 10 can be afterburned. In this case, the salt bath furnace room also forms the afterburning room.

Die Schwelgase aus dem Ofen 10 können somit entweder intern nachverbrannt werden mit Hilfe des Brenners 22, wie oben bereits beschrieben wurde, oder sie können extern nachverbrannt werden mit Hilfe des Brenners 52 im Ofenraum des Salzbadofens 32, wobei in diesem Fall gegebenenfalls auf den Brenner 22 verzichtet werden kann, oder es ist eine kombinierte Betriebsweise möglich, d.h., interne und externe Nachverbrennung unter Verwendung beider Brenner 22 und 52, was den Vorteil bietet, daß der Schwelgasofen 10 eine größere Beladung mit zu bearbeitendem Schwelgut 16, insbesondere im Anfangsstadium, erhalten kann.The carbonization gases from the furnace 10 can thus either be re-burned internally with the help of the burner 22, as already described above, or they can be re-burned externally with the help of the burner 52 in the furnace space of the salt bath furnace 32, in which case, if necessary, the burner 22 can be dispensed with, or a combined mode of operation is possible, ie internal and external post-combustion using both burners 22 and 52, which has the advantage that the carbonization furnace 10 can receive a greater load with carbonization material 16 to be processed, particularly in the initial stage .

Der Ofenraum des Salzbadofens 32 ist bei der Ausführungsform nach Figur 3 zweckmäßigerweise über eine Zweigrohrleitung 54 an den Kamin 30 angeschlossen, wodurch sich die Möglichkeit ergibt, einen Teil der Nachverbrennungsabgase direkt in den Kamin einzuleiten, ohne daß dieser Teil der Abgase den Salzbadbehälter 34 umströmt, um eine eventuelle Überhitzung des Salzbadbehälters 34 zu vermeiden. Die Rohrleitung 34 ist an ihrer Eingangsseite zweckmäßigerweise mit einer geeigneten Klappe 56 versehen, und sie kann auch an ihrer Austrittsseite in den Kamin 30 mit einer Klappe 58 versehen sein, die ein Eintreten von Gasen oder Luft aus dem Kamin 30 in die Rohrleitung 54 verhindert.In the embodiment according to FIG. 3, the furnace space of the salt bath furnace 32 is expediently connected to the chimney 30 via a branch pipeline 54, which makes it possible to introduce part of the post-combustion exhaust gases directly into the chimney without this part of the exhaust gases flowing around the salt bath container 34. in order to avoid possible overheating of the salt bath container 34. The pipeline 34 is expedient on its input side provided with a suitable flap 56, and it can also be provided on its outlet side in the chimney 30 with a flap 58 which prevents the entry of gases or air from the chimney 30 into the pipeline 54.

Eine derartige Zweigleitung zur direkten Ableitung eines Teils der Nachbrennabgase kann gegebenenfalls auch innerhalb des Ofenraumes des Salzbadofens 32 eingebaut sein, die dann direkt an die Verbindungsrohrleitung 38 angeschlossen sein kann (nicht gezeigt).Such a branch line for the direct discharge of part of the afterburning exhaust gases can optionally also be installed inside the furnace space of the salt bath furnace 32, which can then be connected directly to the connecting pipeline 38 (not shown).

Die kombinierte Ausführungsform nach Figur 3 kann bei entsprechender Modifikation auch für andere Systeme, z.B. bei der Wirbelbettentlackung, verwendet werden.The combined embodiment according to Figure 3 can, with appropriate modification, also for other systems, e.g. for fluidized bed stripping.

Claims (10)

  1. Process for operating a plant for removing paint or lacquer coatings from metal parts which has the following steps:
    a) the metal parts are heated in a carbonising furnace and the coatings are burned off,
    b) the metal parts thus treated are finally cleaned in an after-cleaning plant, and
    c) the carbonising gases from the carbonising furnace are used after combustion for heating the after-cleaning plant.
  2. Process according to claim 1, characterised in that combustion of the carbonising gases from the carbonising furnace tales place optionally internally or externally of the after-cleaning plant.
  3. Process according to claim 2, characterised in that during external combustion the flue gases are passed directly to the after-cleaning plant.
  4. Process according to one of claims 1 to 3, characterised in that the after-cleaning plant is a salt bath in which the metal parts treated in the carbonising furnace are immersed for final cleaning.
  5. Plant for removing paint or lacquer coatings from metal parts, which has the following:
    - a carbonising furnace (10) for heating the metal parts and for burning off the coating,
    - an after-cleaning plant (32) for final cleaning of the metal parts treated in the carbonising furnace, and
    - a connecting line (24, 26, 28, 30; 40) controllable by means of valves between the outlet of the carbonising furnace (10) and the after-cleaning plant (32) for utilising the flue gases combusted in a combustion device (20, 22, 52) for heating the after-cleaning plant (32).
  6. Plant according to claim 5, characterised in that the combustion device (22, 52) is arranged optionally externally or internally of the after-cleaning plant (32).
  7. Plant according to claim 6, characterised in that a heating burner (52), which at the same time forms the internal combustion device, is arranged in the after-cleaning plant (32).
  8. Plant according to one of claims 5 to 7, characterised in that the combusted flue gases can be discharged to the atmosphere via a chimney (30).
  9. Plant according to claim 8, characterised in that the after-cleaning plant (32) is connected to the chimney (30) via a branched line (54), by means of which chimney (30) at least some of the combusted flue gases can be introduced directly into the chimney (30) while avoiding the after-cleaning plant (32).
  10. Plant according to one of claims 5 to 9, characterised in that the after-cleaning plant is a salt bath.
EP90100356A 1989-01-24 1990-01-09 Process and apparatus for cleaning metal parts Expired - Lifetime EP0384108B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90100356T ATE104218T1 (en) 1989-01-24 1990-01-09 METHOD AND DEVICE FOR CLEANING METAL PARTS.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3901982 1989-01-24
DE3901982 1989-01-24
DE3920519 1989-06-22
DE3920519A DE3920519A1 (en) 1989-01-24 1989-06-22 METHOD AND DEVICE FOR CLEANING METAL PARTS

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EP0384108A1 EP0384108A1 (en) 1990-08-29
EP0384108B1 true EP0384108B1 (en) 1994-04-13

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EP90100356A Expired - Lifetime EP0384108B1 (en) 1989-01-24 1990-01-09 Process and apparatus for cleaning metal parts

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DE (2) DE3920519A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4037370A1 (en) * 1990-11-23 1992-05-27 Sommer Metallwerke METHOD AND DEVICE FOR FURTHER TREATING AND PURIFYING EXHAUST GAS PRODUCED IN A SECOND ALUMINUM MELTING PLANT
BE1007224A3 (en) * 1993-06-16 1995-04-25 Dinamec Nv Method and apparatus for thermal cleaning of objects.
PL207916B1 (en) * 2006-09-20 2011-02-28 Michał Wysocki System for removal and utilization of lacquer wastes and/or sediments

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4284428A (en) * 1980-10-29 1981-08-18 Western Electric Co., Inc. Separation of contaminant material from copper wire and cable
US4710126A (en) * 1986-05-23 1987-12-01 Pre-Melt Systems, Inc. Method and apparatus for drying metal chips
GB8617045D0 (en) * 1986-07-12 1986-08-20 Mckechnie Metals Ltd Drying swarf &c

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DE3920519A1 (en) 1990-07-26
DE59005303D1 (en) 1994-05-19
EP0384108A1 (en) 1990-08-29

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