EP3470740B1 - Verfahren zum betrieb von konvektionsofen mit energieeinsparung und erhöhter reinigungseffizienz im pyrolytischen kreislauf - Google Patents

Verfahren zum betrieb von konvektionsofen mit energieeinsparung und erhöhter reinigungseffizienz im pyrolytischen kreislauf Download PDF

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Publication number
EP3470740B1
EP3470740B1 EP18198656.3A EP18198656A EP3470740B1 EP 3470740 B1 EP3470740 B1 EP 3470740B1 EP 18198656 A EP18198656 A EP 18198656A EP 3470740 B1 EP3470740 B1 EP 3470740B1
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EP
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Prior art keywords
temperature
pyrolytic
cycle
oven
pyrolysis
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EP18198656.3A
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English (en)
French (fr)
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EP3470740A1 (de
Inventor
Merve BETGU
Tuba ANIK
Rabia Berna DEMIREL
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.)
Renta Elektrikli Ev Aletleri Sanayi Ve Dis Ticaret Ltd Sirketi
Original Assignee
Renta Elektrikli Ev Aletleri Sanayi Ve Dis Ticaret Ltd Sirketi
Renta Elektrikli Ev Aletleri Sanayi Ve Dis Ticaret LS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C14/00—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning
    • F24C14/02—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning pyrolytic type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices

Definitions

  • the invention is related to a convectional oven with pyrolytic heating system, which is provided with higher self-cleaning efficiency and lower energy consumption, during pyrolytic cycle.
  • the patent application numbered UA93961 discloses the enamel-glass catalytic coating with the self-cleaning property that can be applied on interior surfaces of oven, wherein the coating comprises frit, MnO as oxidation catalyst, catalyst disintegrating greases and AlO used as heat-resistant filler.
  • the coating comprises frit, MnO as oxidation catalyst, catalyst disintegrating greases and AlO used as heat-resistant filler.
  • enamel coatings lose their efficiencies in two or three years and therefore, it is necessary to replace them periodically. Further, manual cleaning process is needed because the coating is not applied on the bottom of oven and the interior surface of door.
  • the control system allowing cycle that is coupled to heating element and temperature sensor provides grid member with power until oven reaches up to triggering temperature.
  • the utility model application numbered CN205635489 discloses a pyrolytic oven comprising an automatic control system, wherein said oven comprises temperature and pressure sensors.
  • said oven comprises temperature and pressure sensors.
  • a limited area could be sensed inside the oven by way of sensor and thus, all dirty regions could not be detected.
  • various system can be integrated with pyrolytic ovens, consuming considerable amount of energy still constitutes a problem, and it is necessary to determine minimum pyrolysis temperature and optimum pyrolysis duration.
  • Objective of the invention is to develop a convectional oven provided with lower energy consumption in the pyrolytic cycle, and a pyrolytic heating system that can be integrated with said oven.
  • Another objective of the invention is to increase the self-cleaning efficiency by means of increasing mass loss of oven chamber dirtiness in the course of pyrolytic cycle through pyrolytic heating system (algorithm).
  • Further objective of the invention is to determine minimum pyrolysis temperature and optimum pyrolysis duration and to achieve energy savings by means of pyrolytic heating system (algorithm).
  • the invention relates to a convectional oven with pyrolytic heating system, which is provided with higher self-cleaning efficiency and lower energy consumption, during pyrolytic cycle, and a pyrolytic heating system that can be integrated with said oven.
  • the convectional oven that is subject matter of the invention comprises a nozzle (3) having a pyrolytic heating system allowing volatiles occurred due to adding of waiting-period in intermediate steps during degradation to be removed in a slower manner from the environment and based on this, to increase mass loss in the course of pyrolytic cycle, also increasing the total of mass loss and discharging water and/or steam from water and/or steam reservoir (1) inside hotspot (4) by means of water and/or steam reservoir (1) and pump (2) positioned in the oven body (5) and outside the oven hotspot (4).
  • Pyrolysis atmosphere is one of the most important factors affecting pyrolysis, and in case there exists water and/or water steam in the atmosphere, total mass loss increases and accordingly, cleaning efficiency increases as well.
  • Figure 2 illustrates a convectional oven with pyrolytic heating system.
  • the pyrolytic heating system that is subject matter of the invention, which comprises hotspot body resistant to pyrolysis temperatures, whose door is locked automatically during pyrolysis process and which can be applied to convectional ovens in which Pyrolysis cycle is carried out through a capillary thermostat or electronic card; comprises the process steps of removing volatiles occurred during degradation from environment in a controlled manner and increasing mass loss throughout pyrolysis cycle by way of keeping water and/or water steam in pyrolysis atmosphere and accordingly achieving a higher cleaning efficiency,
  • the pyrolytic heating system that can be applied to convectional ovens is heated gradually between 5-20°C starting from 200-250°C and is kept at such temperatures for at least 1 minute, and there exist at least two stages in this process step.
  • mixture of margarine and beef broth is prepared in accordance with Standard EN 60335-2-6 in the pyrolytic heating system and is applied on inside of the oven, including its door. Subsequently, the oven is operated on the maximum temperature adjustment in the static position for 3 hours and thus, dirtiness can be obtained in the oven wall.
  • the oven chamber dirtiness is employed as raw material in the course of pyrolytic cycle and it is subjected to thermal analysis in thermogravimetric analysis (TGA) device so as to examine its thermal degradation behavior.
  • dTG values are achieved by means of calculating the derivative of date obtained through as a result of characterization dirtiness with TGA and thus, percent of the total mass loss by weight and maximum degradation temperature achieved.
  • a new pyrolytic heating system is developed by forming a pyrolytic cycle algorithm for the purpose of in a controlled manner removing volatiles appeared in the course of degradation of oven chamber dirt from the chamber and also, increasing the mass loss in the same cycle duration. It is ensured in the new developed heating system that waiting durations are added to intermediate steps along with removing slower manner volatiles appeared during degradation from the chamber and accordingly, in the same cycle duration there is an increased mass loss. Cleaning efficiency also increases along with increase of the total mass loss.
  • Pyrolysis process is carried out in the following cycle duration, for example in the heating system 1 and 2 so as to compare the total mass loss and energy saving in the pyrolytic heating system that is subject matter of the invention.
  • Temperature-time graphs of the present heating system, heating system 1 and heating system 2 are respectively illustrated on the Figure 1a, 1b and 1c .
  • Table 1 Pyrolytic cycle duration applied to heating system 1 and 2 Heating system 1 Heating system 2 Time (min.) Temperature (°C) Time (min.) Temperature (°C) 0 25 0 25 10-35 25-250 10-35 25-250 36-45 250-270 36-45 250-270 45-80 270-500 45-60 270-500 80-140 500 60-110 500
  • Table 2. The total mass loss and maximum degradation temperature in different heating systems Pyrolysis duration (min.) Total mass loss (by weight %) Maximum degradation temperature (°C) Present heating system (10°C/min.) 120 29,19 388 Heating system 1 (Algorithm 1) 120 41,33 380 Heating system 2 (Algorithm 2) 90 36,50 380
  • oven cleaning efficiency is achieved respectively as 41,33% and 36,50% in heating system 1 and 2 According to the present heating system; the total mass loss is increased 41,6 % by weight in the heating system 1 and 25,0 % by weight in the heating system 2. It can be seen that mass loss is considerably increased because there is a waiting period in intermediate steps in the pyrolytic heating system that is subject matter of the invention and it also decreases the maximum degradation temperature.
  • the present heating system and the pyrolytic heating system that is subject matter of the invention are applied in a controlled manner to oven prototypes by means of an electronic device and energy consumption of these systems are given on Table 3.
  • Table 3. Amount of energy consumption of heating system 1 and 2 and the present heating system during pyrolytic cycle Energy consumption (Wh)
  • Pyrolytic heating system that consumes less energy, of which cleaning efficiency is increased during pyrolytic cycle is particularly in a such form that it can be applied to both built-in ovens and heater/cooker devices that require cleaning process.
  • the pyrolytic heating system that is subject matter of the invention and can be integrated with convectional oven and oven chamber exhibits superior properties compared to ovens provided with self-cleaning property by means of increasing self-cleaning efficiency thanks to adding waiting periods at different temperatures during pyrolytic cycle, increasing pyrolytic cycle efficiency by using water and/or steam in hotspot (4) during cycle and achieving energy saving.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electric Ovens (AREA)
  • Cookers (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Electric Stoves And Ranges (AREA)
  • Processing Of Solid Wastes (AREA)

Claims (2)

  1. Verfahren zur Entfernung der flüchtigen Stoffen auf eine kontrollierte Weise, die während des Abbau von Umgebung auftreten, zur Erhöhung des Massenverlust mittels des Pyrolysevorgangs und dementsprechend des Erreichen einer hohen Reinigungseffizienz in konventionellen Öfen mit Pyrolysevorgang, der einen gegen Pyrolysetemperaturen beständigen Heißpunktskörper umfasst, dessen Tür während des Pyrolysevorgangs automatisch verschlossen ist und der auf die konventionellen Öfen angewandt werden kann, wobei der Pyrolysevorgang mittels eines Kapillarthermostat oder einer elektronischen Karte und der selbstreinigenden Eigenschaften aufweist, umfassend die folgenden Prozessschritte;
    • Erhöhung der Temperatur innerhalb des Heißpunkt (4) bis auf 200-250°C, die die Temperatur ist, in der die Pyrolysesreaktionen beginnen, während der Ofen kühl ist, dadurch gekennzeichnet, dass das Verfahren ferner die folgenden Schritte umfasst;
    • Erhöhung der Ofentemperatur auf eine graduelle Wiese zwischen 5-20°C ausgehend von 200-250°C und Beibehaltung davon auf dieser Temperatur für mindestens 1 Minute,
    • Erhöhung die Temperatur innerhalb des Heißpunkt (4) bis auf 350-500°C nach der graduellen Erhöhung der Temperatur,
    • Beibehaltung des Ofens auf dieser Temperatur derart, dass der ganze Pyrolysevorgang mindestens 80 Minuten dauert.
  2. Verfahren gemäß Anspruch 1, gekennzeichnet durch kontinuierlichen oder nicht kontinuierlichen Ausstoß vom Dampf mittels Pumpe (2) und Düse (3) in den Heißpunkt (4) während des Pyrolysevorgang in der Phase der Prozessschritte, um die Reinigungseffizient zu erhöhen.
EP18198656.3A 2017-10-10 2018-10-04 Verfahren zum betrieb von konvektionsofen mit energieeinsparung und erhöhter reinigungseffizienz im pyrolytischen kreislauf Active EP3470740B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TR2017/15311A TR201715311A2 (tr) 2017-10-10 2017-10-10 Pirolitik çevrimde enerji tasarrufu sağlanmış ve temizleme etkinliği arttırılmış konveksiyonel fırın.

Publications (2)

Publication Number Publication Date
EP3470740A1 EP3470740A1 (de) 2019-04-17
EP3470740B1 true EP3470740B1 (de) 2020-04-01

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EP18198656.3A Active EP3470740B1 (de) 2017-10-10 2018-10-04 Verfahren zum betrieb von konvektionsofen mit energieeinsparung und erhöhter reinigungseffizienz im pyrolytischen kreislauf

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EP (1) EP3470740B1 (de)
ES (1) ES2803381T3 (de)
TR (1) TR201715311A2 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020121587A1 (de) * 2020-08-18 2022-02-24 Miele & Cie. Kg Pyrolytische Reinigung eines Gargerätes

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5534678A (en) 1993-11-12 1996-07-09 General Electric Company Oven with improved self-cleaning cycle
DE19758860B4 (de) * 1997-02-17 2007-06-06 Miele & Cie. Kg Verfahren zur Steuerung eines Pyrolysereinigungsvorganges
DE102006013094B4 (de) * 2006-03-20 2010-07-22 Miele & Cie. Kg Verfahren zur automatischen Beendigung eines Pyrolysereinigungsvorgangs bei einem Backofen
IT1397245B1 (it) * 2009-05-07 2013-01-04 Filippi Srl Forno pirolitico multifunzione assistito a vapore
UA93961C2 (en) 2010-01-11 2011-03-25 Национальный технический университет "Харьковский политехнический институт" Self-cleaning catalytic coating
CN205635489U (zh) 2016-04-22 2016-10-12 北京神雾环境能源科技集团股份有限公司 一种热解炉自动控制系统

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EP3470740A1 (de) 2019-04-17
ES2803381T3 (es) 2021-01-26
TR201715311A2 (tr) 2019-04-22

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