EP3957915A1 - Nettoyage pyrolytique d'un appareil de cuisson - Google Patents
Nettoyage pyrolytique d'un appareil de cuisson Download PDFInfo
- Publication number
- EP3957915A1 EP3957915A1 EP21190569.0A EP21190569A EP3957915A1 EP 3957915 A1 EP3957915 A1 EP 3957915A1 EP 21190569 A EP21190569 A EP 21190569A EP 3957915 A1 EP3957915 A1 EP 3957915A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- cooking
- heating
- cooking chamber
- pyrolysis
- 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
Links
- 238000010411 cooking Methods 0.000 title claims abstract description 151
- 238000004140 cleaning Methods 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 62
- 238000000197 pyrolysis Methods 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 39
- 239000000126 substance Substances 0.000 claims description 13
- 230000003197 catalytic effect Effects 0.000 claims description 3
- 230000008030 elimination Effects 0.000 claims description 3
- 238000003379 elimination reaction Methods 0.000 claims description 3
- 235000019645 odor Nutrition 0.000 description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 238000011109 contamination Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000009420 retrofitting Methods 0.000 description 2
- 239000000443 aerosol Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
-
- 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 present invention relates to a method for the pyrolytic cleaning of a cooking appliance with at least one heatable cooking space, a heating device for heating up the cooking space and a temperature control device for controlling a cooking space temperature, the cooking space being heated to a pyrolysis target temperature of between 400° C. and 600° C. in a heating-up phase is heated. Furthermore, the invention relates to a corresponding cooking appliance.
- the cooking chamber With pyrolytic cleaning, the cooking chamber is heated to high temperatures of up to 600°C in order to break down cooking chamber contamination from baking or roasting, such as leftover food or fat residue. After the pyrolysis process, which usually lasts several hours, the dirt has turned to ash and can then be easily wiped off. In the case of cooking appliances with a pyrolysis function, there is usually no need for time-consuming manual cleaning of the cooking chamber.
- a disadvantage of the previously known pyrolysis cleaning processes is that, due to the constant exchange of air between the cooking chamber and the area surrounding the cooking appliance, they are accompanied by a strong odor that is perceived as unpleasant.
- a method for controlling a pyrolytic cleaning process in which the heating power and consequently the cooking chamber temperature is regulated on the basis of an oxygen content within the cooking chamber.
- the oxygen is thereby displaced by the odorous substances which cause the odor pollution and occur, for example, in the form of vapors, gases and/or smoke, so that a low oxygen concentration correlates with a high odorous substance concentration. If the oxygen concentration falls below a certain limit, the heating output is reduced so that less dirt is burned and thus fewer odors are produced.
- the limit value is set in such a way that the amount of odorous substance that is still produced can be converted by the catalyst and the odor pollution is thus kept within limits.
- the method should preferably be able to be carried out without an additional sensor system.
- the odor pollution can be greatly reduced if, after heating the cooking chamber to a cooking chamber temperature of 270°C and starting from a cooking chamber temperature of 270°C, the cooking chamber is heated to a cooking chamber temperature of 350°C with an average heating rate of 2 K/min to 4 K/min n is heated. It has been shown that especially in the critical temperature range of 270 °C to 350 °C, particularly odor-intensive molecules, such as a large number of fat residues, are converted to a greater extent.
- the odorous substances are converted more slowly and distributed over a longer period of time, so that the odor pollution that correlates with the odorous substance concentration is reduced, with the pyrolysis process as such not being unnecessarily in the length is pulled, which would be perceived as disadvantageous by users of the device.
- the slower conversion of particularly odor-intensive molecules means that the odor load in the vicinity of the cooking appliance can be better reduced through adequate ventilation. If the cooking appliance is equipped with a catalytic converter, this can better counteract odor pollution since it is overloaded less frequently or no longer due to the lower concentration of odorous substances.
- Ovens/stoves and combination ovens with steam cooking and/or microwave functions can be considered as cooking appliances, as can ovens with high-frequency technology.
- the pyrolysis process can be at least partially, in particular completely, controlled or regulated using preset parameters without having to rely on additional sensitive sensors, for example for detecting oxygen, smoke or other gases or aerosols.
- the method can be implemented in a particularly simple manner and is also optimally suited as a retrofit solution for existing cooking appliances, for example as part of a software update.
- a particularly known device for controlling a cooking chamber temperature Having a temperature sensor for detecting the cooking chamber temperature and at least regulates the power of the heating device in such a way that the cooking chamber temperature reaches a target cooking chamber temperature.
- the temperature control device can be controlled via software.
- the temperature control device can be at least partially part of a control unit that controls the cooking appliance.
- the temperature control device can be designed as an independent unit with a processor, a memory, communication interfaces and/or other components for electronic data processing and can be connected to the control unit of the cooking appliance—wirelessly or by wire—for data transmission.
- the target cooking chamber temperature is increased stepwise and/or continuously at least in sections.
- the heating rate of the cooking chamber temperature can be set particularly easily in this way.
- the setpoint cooking chamber temperature is preferably lowered a first time at the latest when the cooking chamber temperature reaches 270.degree.
- the cooking chamber is heated to the pyrolysis target temperature at an average heating rate of 4 K/min to 7 K/min.
- an average heating rate 4 K/min to 7 K/min.
- the method comprises a pyrolysis holding phase in which the pyrolysis target temperature is at a substantially constant temperature between 400° C. and 600° C., preferably between 410° C. and 500° C., particularly preferably between 420 °C and 470°C.
- this pyrolysis holding phase which is run through after the moderate heating stage in the temperature range from 270°C to 350°C and in particular following a further moderate heating stage in the temperature range from 350°C up to the pyrolysis target temperature, all remaining contamination residues turn to ash burned.
- the pyrolysis holding phase preferably lasts at least 15 minutes and at most 5 hours.
- the cooking chamber is briefly heated one or more times in the pyrolysis holding phase to a peak temperature above the pyrolysis target temperature.
- time losses that can be attributed to the at least one moderate heating stage can be compensated for.
- the pyrolysis holding phase can preferably be shortened in such a way that the total duration of the pyrolysis process is reduced compared to the usual process durations.
- heating takes place from the pyrolysis target temperature to a peak temperature with the maximum power of the heating device.
- the peak temperature is preferably at least 20 K, preferably at least 50 K, particularly preferably at least 100 K, and at most 200 K above the selected pyrolysis target temperature.
- the peak temperature corresponds to the maximum permissible cooking chamber temperature of the cooking appliance.
- the cooking chamber is heated to a cooking chamber temperature of 270° C. at an average heating rate of 15 K/min to 25 K/min.
- the cooking chamber heats up particularly quickly in the less critical temperature range below 270°C, which minimizes the overall duration of the pyrolysis process.
- a starting temperature is in particular a temperature below 270° C. that is present in the cooking chamber at the beginning of the pyrolysis process.
- the starting temperature essentially corresponds to the temperature of the surroundings of the cooking appliance if the cooking appliance has not been in operation for a long period of time. However, it can also be a higher temperature, for example following a cooking process.
- the heating in this initial heating phase takes place with maximum conduction of the heating device.
- odors produced during the pyrolytic cleaning in the cooking chamber which occur for example in the form of vapors, gases and/or smoke, are preferably removed by means of an odor elimination device of the cooking appliance arranged in particular in an exhaust air opening of the cooking appliance a catalyst.
- an odor elimination device of the cooking appliance arranged in particular in an exhaust air opening of the cooking appliance a catalyst.
- the odor can be counteracted particularly efficiently. Due to the lower concentration of odorous substances due to the at least one moderate heating stage, the catalytic converter is overloaded less frequently or no longer and can thus largely, in particular almost completely, decompose and/or burn the odorous substances before they are released into the environment of the cooking appliance.
- the cooking appliance according to the invention has at least one heatable cooking space, a heating device for heating up the cooking space and a temperature control device for controlling a cooking space temperature.
- the cooking appliance is suitable and designed to carry out pyrolytic cleaning, in which the cooking chamber is heated to a pyrolysis target temperature of between 400° C. and 600° C. in a heating-up phase.
- the cooking appliance is characterized in that it is suitable and designed to carry out a method according to one of Claims 1 to 8.
- a temperature control device in the context of this invention is understood to be a device for controlling a cooking chamber temperature, which is known per se and has a temperature sensor for detecting the cooking chamber temperature and regulates at least the power of the heating device in such a way that the cooking chamber temperature reaches a target cooking chamber temperature.
- the temperature control device can be controlled via software.
- the temperature control device can be at least partially part of a control unit that controls the cooking appliance.
- the temperature control device can be designed as an independent unit with a processor, a memory, communication interfaces and/or other components for electronic data processing and can be connected to the control unit of the cooking appliance—wirelessly or by wire—for data transmission.
- the cooking appliance is configured by means of the temperature control device and/or the control unit to carry out a method according to one of claims 1 to 8.
- the present invention provides a novel method for pyrolytic cleaning of a cooking chamber with reduced odor pollution, which can be implemented in a particularly simple manner and is therefore also optimally suited for retrofitting existing cooking appliances.
- FIGS 1 to 3 show temperature curves of a cooking chamber temperature T in a cooking chamber 4 of a cooking appliance 2 in various embodiments of the method according to the invention.
- the cooking chamber 4 is heated to a pyrolysis target temperature ZT of between 400° C. and 600° C. in a heating-up phase A by a heating device that can be controlled via a temperature control device 12 .
- the cooking chamber 4 is first heated to 270.degree. Starting from a cooking chamber temperature T of 270° C., the cooking chamber 4 is then heated in a first moderate heating stage M to a cooking chamber temperature T of 350° C., the average heating rate being 2 K/min to 4 K/min. In this way, the particularly odor-intensive molecules that are formed in the critical temperature range of 270 °C to 350 °C are reacted more slowly and distributed over a longer period of time.
- heating from a starting temperature (usually room temperature) up to 270 °C can take place at much higher heating rates of 15 K/min to 25 K/min and in particular at maximum power of the heating device in order to keep the total duration of the pyrolysis process as short as possible .
- the cooking chamber 4 is heated to the pyrolysis target temperature ZT in a second moderate heating stage M' at an average heating rate of 4 K/min to 7 K/min. Since a large part of odor-intensive molecules has already been converted by the preceding first moderate heating stage M when a cooking chamber temperature T of 350 °C is reached, heating can take place at a heating rate that is still throttled, but higher than the first moderate heating stage M, without that the odor load is significantly increased.
- the second moderate heating stage M' is followed by the pyrolysis holding phase H, in which the cooking chamber temperature T is at the essentially constant pyrolysis target temperature ZT between 400° C. and 600° C., preferably between 410° C. and 500° C., in particular preferably between 420°C and 470°C. Since a large part of the critical odorous substances has already been converted in the preceding moderate heating stages M, M', the pyrolysis holding phase H, which is decisive for the cleaning result, can be carried out without the odor load being significantly increased.
- the pyrolysis holding phase H preferably lasts at least 30 minutes and at most 5 hours.
- the cooking chamber 4 in the pyrolysis holding phase H is briefly heated to a peak temperature above the pyrolysis target temperature ZT.
- the peak temperature is preferably at least 20 K, preferably at least 50 K, particularly preferably at least 100 K, and at most 200 K above the selected pyrolysis target temperature ZT and corresponds in particular to the maximum permissible cooking chamber temperature T of the cooking appliance 2.
- FIG 3 shows a real measurement curve of the cooking chamber temperature T over time.
- a target cooking chamber temperature is initially maintained at 270° C. and then increased in stages, here by approx. 30 K each time. After reaching the set cooking space temperature, the cooking space temperature T still slightly exceeds it (overshooting).
- the target cooking chamber temperature is increased in stages. The target cooking chamber temperature is then kept at a constant temperature of approx. 440 °C during the pyrolysis holding phase H.
- the cooking appliance 2 shows a cooking appliance 2 according to the invention in the form of an oven with a heatable cooking chamber 4.
- the cooking appliance 2 has a heating device which, in this embodiment, has a top-heating element 6 and a bottom-heating element 8 below the cooking chamber floor and a circulating fan 10 equipped with a ring heater.
- a temperature control device 12, which is part of a control unit 14 of the cooking appliance 2 is used to control the cooking compartment temperature T recorded by a temperature sensor 16 in the cooking compartment 4.
- the cooking appliance 2 is suitable and designed for this purpose, in particular by means of the control unit 14 and/or the temperature control device 12 configured to carry out the inventive method for pyrolytic cleaning of the cooking chamber 4.
- the cooking appliance 2 also has an odor elimination device (not shown here) designed as a catalyst, which is arranged in an exhaust air opening of the cooking appliance 2 and treats odors produced during the pyrolytic cleaning carried out with the cooking chamber door 18 closed.
- an odor elimination device (not shown here) designed as a catalyst, which is arranged in an exhaust air opening of the cooking appliance 2 and treats odors produced during the pyrolytic cleaning carried out with the cooking chamber door 18 closed.
- the odorous substances can be largely, in particular almost completely, decomposed and/or burned before being released into an area surrounding the cooking appliance 2 .
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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)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020121587.8A DE102020121587A1 (de) | 2020-08-18 | 2020-08-18 | Pyrolytische Reinigung eines Gargerätes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3957915A1 true EP3957915A1 (fr) | 2022-02-23 |
EP3957915B1 EP3957915B1 (fr) | 2023-04-26 |
Family
ID=77274730
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21190569.0A Active EP3957915B1 (fr) | 2020-08-18 | 2021-08-10 | Appareil de cuission et procédé de nettoyage pyrolytique d'un appareil de cuisson |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3957915B1 (fr) |
DE (1) | DE102020121587A1 (fr) |
PL (1) | PL3957915T3 (fr) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2061865A1 (de) * | 1970-12-16 | 1972-06-22 | Siemens Elektrogeraete Gmbh | Verfahren und Anordnung zum Reinigen der Muffel eines Backofens |
DE3924782A1 (de) * | 1989-07-26 | 1991-01-31 | Bosch Siemens Hausgeraete | Herd mit pyrolytischer selbstreinigung der muffel |
EP0632232A1 (fr) * | 1993-07-01 | 1995-01-04 | Bosch-Siemens HausgerÀ¤te GmbH | Fourneau comportant une possibilité d'auto-nettoyage pyrolytique |
DE10246498A1 (de) * | 2002-10-04 | 2004-04-22 | Miele & Cie. Kg | Verfahren zur Temperaturregelung eines Backofens mit Katalysator |
DE102010039280A1 (de) * | 2009-09-02 | 2011-03-03 | BSH Bosch und Siemens Hausgeräte GmbH | Verfahren zum Durchführen eines Pyrolysevorgangs bei einem Hausgerät |
EP1837601B1 (fr) | 2006-03-20 | 2014-05-07 | Miele & Cie. KG | Procédé destiné à la commande d'un processus de nettoyage à pyrolyse dans un four |
EP3470740A1 (fr) * | 2017-10-10 | 2019-04-17 | Doruk Ev Gerecleri Sanayi Ve Ticaret Limited Sirketi | Four à convection muni d'économies d'énergie et d'une efficacité de nettoyage accrue dans un cycle pyrolytique |
-
2020
- 2020-08-18 DE DE102020121587.8A patent/DE102020121587A1/de active Pending
-
2021
- 2021-08-10 PL PL21190569.0T patent/PL3957915T3/pl unknown
- 2021-08-10 EP EP21190569.0A patent/EP3957915B1/fr active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2061865A1 (de) * | 1970-12-16 | 1972-06-22 | Siemens Elektrogeraete Gmbh | Verfahren und Anordnung zum Reinigen der Muffel eines Backofens |
DE3924782A1 (de) * | 1989-07-26 | 1991-01-31 | Bosch Siemens Hausgeraete | Herd mit pyrolytischer selbstreinigung der muffel |
EP0632232A1 (fr) * | 1993-07-01 | 1995-01-04 | Bosch-Siemens HausgerÀ¤te GmbH | Fourneau comportant une possibilité d'auto-nettoyage pyrolytique |
DE10246498A1 (de) * | 2002-10-04 | 2004-04-22 | Miele & Cie. Kg | Verfahren zur Temperaturregelung eines Backofens mit Katalysator |
EP1837601B1 (fr) | 2006-03-20 | 2014-05-07 | Miele & Cie. KG | Procédé destiné à la commande d'un processus de nettoyage à pyrolyse dans un four |
DE102010039280A1 (de) * | 2009-09-02 | 2011-03-03 | BSH Bosch und Siemens Hausgeräte GmbH | Verfahren zum Durchführen eines Pyrolysevorgangs bei einem Hausgerät |
EP3470740A1 (fr) * | 2017-10-10 | 2019-04-17 | Doruk Ev Gerecleri Sanayi Ve Ticaret Limited Sirketi | Four à convection muni d'économies d'énergie et d'une efficacité de nettoyage accrue dans un cycle pyrolytique |
Also Published As
Publication number | Publication date |
---|---|
DE102020121587A1 (de) | 2022-02-24 |
PL3957915T3 (pl) | 2023-08-14 |
EP3957915B1 (fr) | 2023-04-26 |
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