EP2360443A1 - 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
EP2360443A1
EP2360443A1 EP09016114A EP09016114A EP2360443A1 EP 2360443 A1 EP2360443 A1 EP 2360443A1 EP 09016114 A EP09016114 A EP 09016114A EP 09016114 A EP09016114 A EP 09016114A EP 2360443 A1 EP2360443 A1 EP 2360443A1
Authority
EP
European Patent Office
Prior art keywords
fresh air
dryer
clean gas
enclosed
thermal
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.)
Granted
Application number
EP09016114A
Other languages
German (de)
English (en)
Other versions
EP2360443B1 (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
Original Assignee
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 EP09016114.2A priority Critical patent/EP2360443B1/fr
Priority to HUE09016114A priority patent/HUE030552T2/hu
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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    • 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, wherein the exhaust air from the dryer via exhaust fan of a thermal afterburner is supplied and heated in this and as pure gas by separately established Umgasrekuperatoren and at least one separately installed fresh air recuperator is performed, in which the umgas removed from the dryer and the fresh air are heated and then guided via Umgas- and fresh air blower in the dryer.
  • the freshly painted bodies on a support frame called SKID are driven into the dryer according to the state of the art, with 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 the 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.
  • This known, currently generally used drying process is no longer efficient due to the rising primary energy prices.
  • the procedural heat requirement for the dryer and the real primary energy consumption are not in equilibrium, because the projected clean gas temperature of 160 - 180 ° C does not correspond to the real clean gas temperature.
  • the real clean gas temperatures are usually between 280 - 320 ° C. Dryer temperature and combustion chamber temperature are controlled, but the dryer load and pollutant concentration in the dryer are disregarded.
  • the electric motors of the large fans for fresh air and raw gas often run at the same speed, which means that the air masses remain unregulated.
  • 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 known in particular for vehicle bodies, in the dryer has at least one longitudinally extending tubular heating element, in which runs an inner tube heated with the clean gas, wherein the circulating air dryer is guided and heated by an annular gap between the inner tube and the heating element.
  • 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 recycle gas recuperator for heating the ambient gas, then through a further clean gas line through the dryer and then at least one second Umgasrekuperator is supplied and subsequently via a clean gas line again through the dryer and finally a Frischluftrekuperator for heating the dryer especially in the inlet and outlet of the dry goods supplied fresh air, the fresh air before entering the fresh air recuperator by a between the outer skin and an outer housing the thermal afterburner system enclosed annular gap is performed.
  • 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 afterburner. These Temperature is now lowered so far according to the invention by the heat release 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.
  • Claim 2 specifies an additional pollutant concentration control.
  • 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 -.
  • the C-total PID controller gives a command value to the frequency inverters of the two electric motors of the raw gas or exhaust fans, which lower the speed accordingly, as the C total values increase. 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 about 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 3 calls a defined vacuum control at the inlet and outlet lock. So far hot air was used in the locks. According to the invention now defined fresh air is supplied to the locks, with an opposite suction device is provided with a vacuum-controlled control valve, so that the negative pressure in the inlet and the outlet lock remains constant and consequently too much "Fatschtuft" 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 designated 9.
  • 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 removed 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 portion 24a of the clean gas line 24 through the heating zone 3 of the dryer 1 and then enters the first recirculating gas 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 serves as barrier air for separating the dryer atmosphere and the environment in the inlet lock and in the outlet lock. It is supplied via the input fresh air line 15 and the pump unit 18 to the outer housing annular gap 22 of the thermal post-combustion system, 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 preferably from the fresh air recuperator Exiting heated fresh air is supplied via the fresh air line 15b 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)
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
EP09016114.2A EP2360443B1 (fr) 2009-12-30 2009-12-30 Procédé de séchage de produits de séchage laqués, notamment carrosseries de véhicule
HUE09016114A HUE030552T2 (hu) 2009-12-30 2009-12-30 Eljárás lakkozott szárítandó tárgyak, különösen jármûkarosszériák szárítására

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 true EP2360443A1 (fr) 2011-08-24
EP2360443B1 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)

Cited By (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
WO2023227165A1 (fr) * 2022-05-24 2023-11-30 Dürr Systems Ag Système de recirculation, installation de traitement et procédé de fonctionnement d'un système de recirculation

Citations (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
US5144754A (en) * 1988-05-02 1992-09-08 Abb Flakt Ab Method for controlling the supply and the discharge of hot air to and from, respectively, a blowing tunnel
EP0803296A1 (fr) * 1995-10-03 1997-10-29 Taikisha, Ltd. Etuve de sechage de peinture
DE19735322A1 (de) 1997-08-14 1999-02-18 Bayerische Motoren Werke Ag Durchlauflufttrocknungsanlage
DE19848661A1 (de) * 1998-10-22 2000-04-27 Bayerische Motoren Werke Ag Thermische Nachverbrennungsanlage
DE19941184A1 (de) * 1999-08-30 2001-03-01 Flaekt Ab Lacktrockner und Lacktrockneranlage
WO2005043056A2 (fr) * 2003-10-23 2005-05-12 Durr Industries, Inc. Tube radiant et four a convection
EP1801526A2 (fr) * 2005-12-23 2007-06-27 EISENMANN Anlagenbau GmbH & Co. KG Sécheur
WO2009109358A1 (fr) * 2008-03-05 2009-09-11 Eisenmann Anlagenbau Gmbh & Co. Kg Sécheur pour installation de peinture

Patent Citations (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
US5144754A (en) * 1988-05-02 1992-09-08 Abb Flakt Ab Method for controlling the supply and the discharge of hot air to and from, respectively, a blowing tunnel
EP0803296A1 (fr) * 1995-10-03 1997-10-29 Taikisha, Ltd. Etuve de sechage de peinture
DE19735322A1 (de) 1997-08-14 1999-02-18 Bayerische Motoren Werke Ag Durchlauflufttrocknungsanlage
DE19848661A1 (de) * 1998-10-22 2000-04-27 Bayerische Motoren Werke Ag Thermische Nachverbrennungsanlage
DE19941184A1 (de) * 1999-08-30 2001-03-01 Flaekt Ab Lacktrockner und Lacktrockneranlage
WO2005043056A2 (fr) * 2003-10-23 2005-05-12 Durr Industries, Inc. Tube radiant et four a convection
EP1801526A2 (fr) * 2005-12-23 2007-06-27 EISENMANN Anlagenbau GmbH & Co. KG Sécheur
WO2009109358A1 (fr) * 2008-03-05 2009-09-11 Eisenmann Anlagenbau Gmbh & Co. Kg Sécheur pour installation de peinture

Cited By (8)

* 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
WO2018015855A1 (fr) * 2016-07-18 2018-01-25 Geico Spa Installation de séchage pour objets peints
CN109564062A (zh) * 2016-07-18 2019-04-02 杰艺科股份公司 用于喷漆物体的干燥设备
US20190316841A1 (en) * 2016-07-18 2019-10-17 Geico S.P.A. Drying plants for painted objects
RU2737531C2 (ru) * 2016-07-18 2020-12-01 Джейко СПА Сушильная установка для окрашенных объектов
US10935315B2 (en) 2016-07-18 2021-03-02 Geico S.P.A. Drying plants for painted objects
WO2023227165A1 (fr) * 2022-05-24 2023-11-30 Dürr Systems Ag Système de recirculation, installation de traitement et procédé de fonctionnement d'un système de recirculation

Also Published As

Publication number Publication date
EP2360443B1 (fr) 2016-08-03
HUE030552T2 (hu) 2017-05-29

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