EP0384108B1 - Procédé et appareil pour le nettoyage d'articles métalliques - Google Patents

Procédé et appareil pour le nettoyage d'articles métalliques 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
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
EP90100356A
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German (de)
English (en)
Other versions
EP0384108A1 (fr
Inventor
Erich Krämer
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.)
Individual
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Individual
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Filing date
Publication date
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Priority to AT90100356T priority Critical patent/ATE104218T1/de
Publication of EP0384108A1 publication Critical patent/EP0384108A1/fr
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Publication of EP0384108B1 publication Critical patent/EP0384108B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • 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)

Claims (10)

  1. Procédé pour réaliser une installation d'élimination de revêtements de peinture ou de vernis de pièces métalliques qui présente les phases suivantes:
    a) les pièces métalliques sont réchauffées dans un four à distillation lente et les revêtements sont brûlés,
    b) les pièces métalliques ainsi traitées sont nettoyées dans une installation de post-nettoyage, et
    c) les gaz dégagés du four à distillation lente sont utilisés, après une post-combustion, pour chauffer l'installation de post-nettoyage.
  2. Procédé suivant la revendication 1, caractérisé en ce que la post-combustion des gaz dégagés du four à distillation lente a lieu, au choix, à l'intérieur ou à l'extérieur de l'installation de post-nettoyage.
  3. Procédé suivant la revendication 2, caractérisé en ce que les gaz de la post-combustion externe passent directement à l'installation de post-nettoyage.
  4. Procédé suivant une des revendications 1 à 3, caractérisé en ce que l'installation de post-nettoyage est un bain de sel dans lequel les pièces métalliques traitées dans le four à distillation lente sont plongées pour le nettoyage final.
  5. Installation d'élimination de revêtements de peintures ou de vernis de pièces métalliques qui présente comme suit:
    - un four à distillation lente (10) pour réchauffer les pièces métalliques et brûler les revêtements,
    - une installation de post-nettoyage (32) pour le nettoyage final des pièces métalliques traitées dans le four à distillation lente, et,
    - une conduite de raccordement (24, 26, 28, 30; 44), commandable au moyen de soupapes, entre la sortie du four à distillation lente (10) et l'installation de post- nettoyage (32) permettant d'utiliser les gaz post-brûlés dans une installation de post-combustion (20, 22, 52) pour chauffer l'installation de post-nettoyage (32).
  6. Installation suivant la revendication 5, caractérisée en ce que l'installation de post-combustion (22, 52) est disposée, au choix, à l'extérieur ou à l'intérieur de l'installation de post-nettoyage (32).
  7. Installation suivant la revendication 6, caractérisée en ce qu' est monté un brûleur de mise en température (52) dans l'installation de post-nettoyage (32), qui forme en même temps l'installation interne de post-combustion.
  8. Installation suivant une des revendications 5 à 7, caractérisée en ce que les gaz de la post-combustion peuvent être évacués dans l'atmosphère, par une cheminée (30).
  9. Installation suivant la revendication 8, caractérisée en ce que l'installation de post-nettoyage (32) est raccordée à la cheminée (30) par un branchement (54) qui permet de diriger directement dans la cheminée (30), en contournant l'installation de post-nettoyage (32), une partie au moins des gaz de la post-combustion.
  10. Installation suivant une des revendications 5 à 9, caractérisée en ce que l'installation de post-nettoyage est un bain de sel.
EP90100356A 1989-01-24 1990-01-09 Procédé et appareil pour le nettoyage d'articles métalliques Expired - Lifetime EP0384108B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90100356T ATE104218T1 (de) 1989-01-24 1990-01-09 Verfahren und vorrichtung zum reinigen von metallteilen.

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 (de) 1989-01-24 1989-06-22 Verfahren und vorrichtung zum reinigen von metallteilen

Publications (2)

Publication Number Publication Date
EP0384108A1 EP0384108A1 (fr) 1990-08-29
EP0384108B1 true EP0384108B1 (fr) 1994-04-13

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EP90100356A Expired - Lifetime EP0384108B1 (fr) 1989-01-24 1990-01-09 Procédé et appareil pour le nettoyage d'articles métalliques

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EP (1) EP0384108B1 (fr)
DE (2) DE3920519A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4037370A1 (de) * 1990-11-23 1992-05-27 Sommer Metallwerke Verfahren und vorrichtung zum weiterbehandeln und reinigen von in einem sekundaer-aluminium-schmelzwerk entstehenden abgasen
BE1007224A3 (nl) * 1993-06-16 1995-04-25 Dinamec Nv Werkwijze en inrichting voor het thermisch reinigen van voorwerpen.
PL207916B1 (pl) * 2006-09-20 2011-02-28 Michał Wysocki System do usuwania i utylizacji odpadów i/lub osadów lakierniczych i sposób usuwania i utylizacji odpadów i/lub osadów lakierniczych

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

Also Published As

Publication number Publication date
DE3920519A1 (de) 1990-07-26
EP0384108A1 (fr) 1990-08-29
DE59005303D1 (de) 1994-05-19

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