EP2360443B1 - Procédé de séchage de produits de séchage laqués, notamment carrosseries de véhicule - Google Patents

Procédé de séchage de produits de séchage laqués, notamment carrosseries de véhicule Download PDF

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Publication number
EP2360443B1
EP2360443B1 EP09016114.2A EP09016114A EP2360443B1 EP 2360443 B1 EP2360443 B1 EP 2360443B1 EP 09016114 A EP09016114 A EP 09016114A EP 2360443 B1 EP2360443 B1 EP 2360443B1
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EP
European Patent Office
Prior art keywords
dryer
fresh air
supplied
recuperator
clean gas
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.)
Not-in-force
Application number
EP09016114.2A
Other languages
German (de)
English (en)
Other versions
EP2360443A1 (fr
Inventor
Klaus Dieter Strohschnieder
Ludger Alerich Wahrheit
Fokko Johann Crone
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.)
Crone Warmetechnik GmbH
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Crone Warmetechnik GmbH
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 Crone Warmetechnik GmbH filed Critical Crone Warmetechnik GmbH
Priority to HUE09016114A priority Critical patent/HUE030552T2/hu
Priority to EP09016114.2A priority patent/EP2360443B1/fr
Publication of EP2360443A1 publication Critical patent/EP2360443A1/fr
Application granted granted Critical
Publication of EP2360443B1 publication Critical patent/EP2360443B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • F26B23/022—Heating arrangements using combustion heating incinerating volatiles in the dryer exhaust gases, the produced hot gases being wholly, partly or not recycled into the drying enclosure
    • 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
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
    • F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2206/00—Waste heat recuperation
    • F23G2206/10—Waste heat recuperation reintroducing the heat in the same process, e.g. for predrying
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
    • F26B2210/12—Vehicle bodies, e.g. after being painted

Definitions

  • the invention relates to a method for drying painted drying goods, in particular vehicle bodies, which are transported after painting through a closed dryer, in which the exhaust air is fed from the dryer via exhaust blower of a thermal Nachverbrennungsangle and heated in this and as pure gas by separately established Umgasrekuperatoren and at least one separately placed Frischluftrekuperator is performed, in which the removed from the dryer Umgas and the fresh air heated and then fed via Umgas- and fresh air blower in the dryer.
  • the freshly painted bodies on a support frame are driven into the dryer according to the prior art, the organic solvents being in the fresh paint of the bodies.
  • the bodies After heating in the heating zone, the bodies enter the holding zone at a temperature of about 140-180 ° C., in which the actual drying process takes place. Afterwards, the bodies leave the dryer.
  • the liberated during the drying process in the dryer gaseous organic substances are removed by suction and fed as exhaust air (crude gas) of a thermal afterburner (TNV) for oxidative conversion of organic substances in the non-toxic compounds carbon dioxide and water vapor.
  • the combustion chamber of TNV is used as fuel z. B. supplied natural gas.
  • the clean gas resulting from the combustion is fed to recirculation recuperators, which reheat the air taken from the dryer. Thereafter, the clean gas is passed through a fresh air recuperator in which the fresh air to be supplied to the dryer is heated.
  • the transmission losses via the heat radiation of the thermal afterburning (surface of the technical afterburning, for example, about 90 m 2 at about 55 ° C.) and the pipelines (surface of the outer skin of the pipeline, for example about 500 m 2 with approx 45 ° C) about 18% of the introduced fuel quantity (source: Institut CUTEC), which corresponds to a mean plant size of about 28 m 3 / h natural gas or equivalent to 278 KW.
  • this heat input into the installation site of the drying plant must be counteracted with high hall ventilation or cooling capacities in order to maintain a justifiable working climate.
  • the clean gas which flows out into the atmosphere after flowing through the recuperators still has relatively high temperatures, with which further considerable heat losses are associated.
  • a paint dryer system in particular for drying of vehicle bodies known, in which the fresh air flows around the clean gas line first and then further heated in a fresh air recuperator charged with the clean gas. Clean gas and fresh air are then fed into the dryer.
  • a dryer in particular for vehicle bodies known in the dryer has at least one longitudinal tubular heating element in which a with the clean gas heated inner tube extends, wherein the circulating air dryer is passed through an annular gap between the inner tube and the heating element and heated.
  • the invention has for its object to provide a method of the type described, which leads to significant additional energy savings and thus at the same time provides significant further cost savings.
  • the hot clean gas emerging from the thermal afterburning plant is passed through the dryer in a clean gas line and fed to a first recirculating gas recuperator for heating the ambient gas, then passed on through the dryer in a clean gas line and then at least one second recycle gas recuperator is and then via a clean gas line again through the dryer and finally a fresh air recuperator for heating the dryer to be supplied in particular in the inlet and outlet area of the dry goods fresh air that the fresh air before entering the fresh air recuperator by a between the outer skin and an outer housing of the thermal
  • the incineration plant enclosed annular gap is performed and that the measured in the dryer pollutant concentration C total of organic solvents adjusted to a controlled variable and by a PID Regl it is monitored that the PID controller with increasing C total values gives a manipulated variable to the frequency converter of the electric motors of the fresh air and exhaust fan, whereby a change in the rotational speeds of the electric motors and the desired C total concentration in the dryer is adjusted again.
  • the clean gas line behind the post-combustion plant has a length of about 100 m.
  • the clean gas has a temperature level of about 400 ° C at the exit from the thermal incinerator. This temperature is now lowered so far according to the invention by the heat transfer in sections in the dryer and in the recuperators that they only after the fresh air recuperator at about 180 ° C.
  • the clean gas in the dryer area has a temperature well above the dryer temperature level, so it can be used to heat the dryer.
  • the clean gas line sections running in the dryer are designed as wide channels and arranged below the body conveyor, then the drying quality of the floor units of the bodies requiring much heat energy is improved, which results in a further advantage of the invention.
  • the fresh air is passed before entering the fresh air recuperator by an enclosed between the outer skin and an outer housing of the thermal oxidation system annular gap. The thus heated here fresh air then needs in the fresh air recuperator only a lower further heating, including the sufficient at the end of the clean gas still existing clean gas temperature.
  • a pollutant concentration control takes place.
  • the pollutant concentration C-total of organic solvents (CnHm) is continuously measured in the middle of the dryer and adjusted to a corresponding control variable -. B. 8 g / m 3 in the standard state - set.
  • the concentration increases, the supply of fresh air is correspondingly increased and, at the same time, the raw gas to be purified (contaminated with solvents) is taken from the dryer and fed to the TNV.
  • the C-total With increasing C total values, the PID controller sends a control value to the frequency converters of the two electric motors of the raw gas or exhaust fans, which reduce the speed accordingly. It will thus set the desired total C-concentration in the dryer of 8 g / m 3 .
  • the energy input in the combustion chamber of the TNV increases with increasing total C concentration, because 8 g / m 3 hydrocarbons mean a heat energy of approx. 640 KW (raw gas volume flow 8000 m 3 / hiN) during combustion in the combustion chamber.
  • the combustor temperature increases, and the combustor temperature controller will decrease the fuel supply by the same amount. Consequently, as the concentration increases, so does the volume flow of the raw gas, so that the volume flow of the exhaust air to be purified (raw gas) in the combustion chamber of the TNV decreases to the same extent. This also results in fuel savings.
  • a continuous safety-related measurement of the total C concentration in the dryer ensures safe operation of the dryer system because the risk of an explosive mixture is ruled out.
  • the measured variables of the C total controller and the C total supervision are constantly compared with each other. If a deviation tolerance is exceeded, the safety C overall monitoring switches immediately to the uncontrolled mode, ie. H.
  • the two electric motors are controlled directly at full line frequency and run at maximum speed, because in interference mode (or negative plausibility check), the frequency converter will be bypassed.
  • Claim 2 calls a defined vacuum control at the inlet and outlet locks. So far hot air was used in the locks. According to the invention, the locks are now supplied with defined fresh air, an opposing suction device being provided with a vacuum-controlled control flap, so that the negative pressure in the inlet and outlet the outlet lock remains constant and consequently too much "false air” is avoided. Preferably, a slight negative pressure of about 10 pascal (Pa) is generated, which prevents the escape of contaminated dry air (exhaust air) in the installation spaces. This results in a further energy saving.
  • Pa pascal
  • the thermal post-combustion system is preferably designed such that it has an inner annular gap closed by an inner housing for the exhaust air and has an outer annular enclosure enclosed by an outer housing for the fresh air flow and that the outer housing is enclosed by an outer insulation.
  • the hot surface skin of the TNV has a temperature of about 500 ° C.
  • the raw gas from the dryer at a temperature of 140 - 180 ° C out.
  • the fresh air is led, which sucked from the hall has a room temperature of about 25 ° C.
  • the fresh air is preferably introduced tangentially on the end face of the thermal afterburner (burner side) and flows along the TNV cylinder to the back of the TNV and thus encloses the entire thermal afterburner.
  • the temperature of the fresh air will increase on its way from the entrance to the exit from the TNV outer shell by about 25 K, so that the outer shell to be insulated is only 50 ° C. With a 100 mm thick insulation, the temperature on the insulation is still about 4 K above room temperature.
  • the dryer 1 has an inlet lock 2, a heating zone 3, a holding zone 4 and an outlet lock 5.
  • the arrow 6 symbolizes the introduction of the bodies, which are located on SKIDs.
  • the small arrow 7 symbolizes the solvents that are introduced with the paint coatings of the bodies in the dryer.
  • the arrow 8 symbolizes the cars leaving the dryer and SKIDs.
  • the thermal afterburner TNV is with 9 designated.
  • the TNV has on its outer circumference an inner enclosed by a housing annular gap 20 for the exhaust air (raw gas) and an annular gap formed by an outer housing 22 for the fresh air.
  • 10 and 12 are Umgas recuperators.
  • 14 is a fresh air recuperator.
  • the fresh air lines are designated 15, 15a and 15b.
  • An exhaust duct is designated 16.
  • 18 is a pump unit for the fresh air with electric motor and frequency converter.
  • 19 is a pump unit for the exhaust air with electric motor and frequency converter.
  • the exhaust air taken from the dryer via the exhaust air line 16 (raw gas) is fed via the pump unit 19 to the thermal post-combustion plant 9 and subjected there to the oxidation process. It is first passed through the inner annulus of the TNV, which preheats it. The exhaust air thus cleaned by conversion leaves the thermal post-combustion system as clean gas in the clean gas line 24.
  • the heating zone 3 and the holding zone 4 of the dryer 1 are removed via Umgas lines 17 cooled heating air (Umgas), which is heated in the Umgas recuperators 10 and 12 and returned to the heating zone and the holding zone.
  • the clean after-combustion system (TNV) leaving clean gas is passed through a section 24a of the clean gas line 24 through the heating zone 3 of the dryer 1 and then enters the first recirculation recuperator 10. This leaving the clean gas via a clean gas line section 24b through the heating zone 3 and the holding zone 4 of the dryer 1 and then fed to the second recirculating gas recuperator 12. This leaving the clean gas is passed through a clean gas line section 24c through the holding zone 4 of the dryer 1 and then passed through the fresh air recuperator 14, whereupon it exits into the atmosphere.
  • TSV clean after-combustion system
  • the separately supplied fresh air is used in the inlet lock and in the outlet lock as sealing air to separate the dryer atmosphere and the environment. It is via the input fresh air line 15 and the pump unit 18 is supplied to the outer housing annular gap 22 of the thermal afterburner, where it is heated. Leaving the annular gap 22, the fresh air passes through the fresh air line 15a in the fresh air recuperator 14, where it is further heated by the clean gas. Indicated here is a bypass line of the fresh air recuperator and an associated control unit. The heated fresh air exiting preferably from the fresh air recuperator is fed via the fresh air line 15b to both the inlet lock 2 and the inlet lock 5 of the dryer 1. From the locks 2 and 5, the fresh air is sucked with suction devices 25 with control valves and directed into the fresh air line 15.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)

Claims (3)

  1. Procédé en vue du séchage de produits de séchage laqués, notamment de carrosseries de véhicules, qui, après le laquage, sont transportés à travers un séchoir (1) fermé, chez lequel l'air vicié provenant du séchoir (1) est admis via un ventilateur à air vicié (1a) entraîné par moteur électrique dans un incinérateur de postcombustion thermique (9) et réchauffé dans celui-ci, puis conduit comme gaz purifié à travers des récupérateurs de gaz de circulation (10, 12) installés séparément, et au moins un récupérateur d'air frais (14) installé séparément, dans lesquels le gaz de circulation prélevé du séchoir (1) et l'air frais sont chauffés, puis conduits ensuite dans le séchoir (1) par des ventilateurs à air vicié et à air frais entraînés par moteur électrique,
    le gaz purifié très chaud sortant de l'incinérateur de postcombustion thermique étant conduit dans une conduite à gaz purifié (24a) à travers le séchoir (1) et admis dans un premier récupérateur de gaz de circulation (10) en vue du réchauffage du gaz de recirculation, étant admis après dans une conduite à gaz purifié (24b) retournant à travers le séchoir (1) et ensuite dans au moins un second récupérateur de gaz de circulation (12), puis après admis via une conduite à gaz purifié (24c) de nouveau à travers le séchoir (1) et enfin un récupérateur d'air frais (14) pour réchauffer l'air frais à admettre dans le séchoir, notamment dans la zone d'admission et de sortie des produits de séchage, et l'air frais étant conduit avant l'admission dans le récupérateur d'air frais (14) à travers un espace annulaire (22) renfermé entre la peau extérieure et un carter externe de l'incinérateur de postcombustion thermique (9), et la concentration en substances nocives mesurée dans le séchoir étant réglée pour l'ensemble du C en solvants organiques à une grandeur réglée étant surveillée par un régulateur PID, le régulateur PID donnant en présence de valeurs globales C croissantes une variable réglante au convertisseur de fréquence des moteurs électriques des ventilateurs à air frais et à air vicié (18, 19), par quoi une modification des régimes des moteurs électriques s'effectue et la concentration totale C souhaitée est réglée de nouveau dans le séchoir (1).
  2. Procédé selon la revendication 1, caractérisé en ce que l'air frais réchauffé est admis dans une écluse d'admission (2) et une écluse de sortie (5) du séchoir (1), en ce que dans l'écluse d'admission et dans l'écluse de sortie, une dépression d'env. 10 pa est générée, qui est maintenue via des dispositifs d'aspiration (25) avec des volets régulateurs commandés sous pression, et en ce que l'air frais aspiré hors de l'écluse d'admission et hors de l'écluse de sortie est admis de nouveau dans le circuit d'air frais.
  3. Procédé selon une quelconque des revendications précédentes, caractérisé en ce que l'air vicié est également conduit avant l'admission dans l'incinérateur de postcombustion thermique à travers un autre espace annulaire renfermé entre la peau extérieure et un carter externe de l'incinérateur de postcombustion thermique.
EP09016114.2A 2009-12-30 2009-12-30 Procédé de séchage de produits de séchage laqués, notamment carrosseries de véhicule Not-in-force EP2360443B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
HUE09016114A HUE030552T2 (hu) 2009-12-30 2009-12-30 Eljárás lakkozott szárítandó tárgyak, különösen jármûkarosszériák szárítására
EP09016114.2A EP2360443B1 (fr) 2009-12-30 2009-12-30 Procédé de séchage de produits de séchage laqués, notamment carrosseries de véhicule

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09016114.2A EP2360443B1 (fr) 2009-12-30 2009-12-30 Procédé de séchage de produits de séchage laqués, notamment carrosseries de véhicule

Publications (2)

Publication Number Publication Date
EP2360443A1 EP2360443A1 (fr) 2011-08-24
EP2360443B1 true EP2360443B1 (fr) 2016-08-03

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EP09016114.2A Not-in-force EP2360443B1 (fr) 2009-12-30 2009-12-30 Procédé de séchage de produits de séchage laqués, notamment carrosseries de véhicule

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EP (1) EP2360443B1 (fr)
HU (1) HUE030552T2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2924381A1 (fr) * 2014-03-28 2015-09-30 Sabine Schindler Alimentation en air frais
IT201600074962A1 (it) * 2016-07-18 2018-01-18 Geico Spa Impianto di essiccazione di oggetti verniciati
DE102022113071A1 (de) * 2022-05-24 2023-11-30 Dürr Systems Ag Umluftanlage, Behandlungsanlage und Verfahren zum Betreiben einer Umluftanlage

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191122182A (en) * 1911-10-09 1912-07-18 Harry Winthrop Turner Improvements in Drying or Baking Stoves or Ovens.
GB2022801A (en) * 1978-06-01 1979-12-19 Bebst Sa An Energy Recovery System for Use on a Printing Press or the Like
US4771707A (en) * 1983-05-12 1988-09-20 Haden Schweitzer Corporation Fume incineration system for paint drying oven
SE458804B (sv) * 1988-05-02 1989-05-08 Flaekt Ab Saett att reglera till- och bortfoerseln av varmluft till resp fraan en blaastunnel
JP3251157B2 (ja) * 1995-10-03 2002-01-28 株式会社大氣社 塗装乾燥炉
DE19735322A1 (de) 1997-08-14 1999-02-18 Bayerische Motoren Werke Ag Durchlauflufttrocknungsanlage
DE19848661B4 (de) * 1998-10-22 2008-09-11 Bayerische Motoren Werke Aktiengesellschaft Thermische Nachverbrennungsanlage
DE19941184A1 (de) * 1999-08-30 2001-03-01 Flaekt Ab Lacktrockner und Lacktrockneranlage
US7063528B2 (en) * 2003-10-23 2006-06-20 Durr Systems Inc. Radiant tube and convection oven
DE102005061973B4 (de) * 2005-12-23 2013-12-19 Eisenmann Ag Trockner
DE102008012792B4 (de) * 2008-03-05 2013-01-03 Eisenmann Ag Trockner für Lackieranlage

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Publication number Publication date
HUE030552T2 (hu) 2017-05-29
EP2360443A1 (fr) 2011-08-24

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