EP3798513B1 - Dispositif chauffant - Google Patents

Dispositif chauffant Download PDF

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Publication number
EP3798513B1
EP3798513B1 EP20198099.2A EP20198099A EP3798513B1 EP 3798513 B1 EP3798513 B1 EP 3798513B1 EP 20198099 A EP20198099 A EP 20198099A EP 3798513 B1 EP3798513 B1 EP 3798513B1
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EP
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Prior art keywords
flame tube
fresh air
gases
combustion
flue
Prior art date
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EP20198099.2A
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German (de)
English (en)
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EP3798513A1 (fr
Inventor
Stefan Ortner
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Oekofen Forschungs und Entwicklungs GmbH
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Oekofen Forschungs und Entwicklungs GmbH
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Priority to RS20220787A priority Critical patent/RS63512B1/sr
Publication of EP3798513A1 publication Critical patent/EP3798513A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B10/00—Combustion apparatus characterised by the combination of two or more combustion chambers
    • F23B10/02—Combustion apparatus characterised by the combination of two or more combustion chambers including separate secondary combustion chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B60/00—Combustion apparatus in which the fuel burns essentially without moving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B80/00—Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel
    • F23B80/02—Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel by means for returning flue gases to the combustion chamber or to the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel 
    • F23L9/04—Passages or apertures for delivering secondary air for completing combustion of fuel  by discharging the air beyond the fire, i.e. nearer the smoke outlet

Definitions

  • the invention relates to a method for reducing emissions from heating devices, in particular heating boilers, in which solid fuel, in particular biomass, is burned in a combustion chamber with the supply of fresh air, combustion gases formed in the combustion chamber being fed to a flame tube via an inflow area facing the combustion chamber. and flue gases formed from the combustion gases are fed via an outflow area of the flame tube to a subsequent flue gas discharge line, via which the emission-causing flue gases are discharged, according to the preamble of claim 1.
  • the invention also relates to a heating device, in particular a heating boiler, with a combustion chamber connected to a fresh air line for the combustion of solid fuel, in particular biomass, and a flame tube with an inflow area facing the combustion chamber for combustion gases formed in the combustion chamber and an outflow area for combustion gases formed from the combustion gases Flue gases facing a subsequent flue gas outlet connected to a fan for evacuation of the flue gases, according to the preamble of claim 7.
  • a heating device in particular a heating boiler, with a combustion chamber connected to a fresh air line for the combustion of solid fuel, in particular biomass, and a flame tube with an inflow area facing the combustion chamber for combustion gases formed in the combustion chamber and an outflow area for combustion gases formed from the combustion gases Flue gases facing a subsequent flue gas outlet connected to a fan for evacuation of the flue gases, according to the preamble of claim 7.
  • Such methods and heating devices 2- are made, for example EP 0 798 510 A2 and U.S. 4,565,184 known and are used to heat a heat transfer medium for use as hot water or for heating purposes using the combustion of a solid fuel.
  • Emissions here are the discharge of harmful or environmentally hazardous pollutants such as carbon monoxide (CO), higher-molecular, volatile, organic Carbon compounds (VOC), nitrogen oxides (NOx) and particles (PM), in particular fine dust particles, understood via the flue gases that arise during the combustion of the solid fuel in the combustion chamber of the heating device.
  • the combustion basically takes place in two different phases, namely in a first phase of the heterogeneous conversion of the solids into fuel gases and in a subsequent phase of the homogeneous gas-phase oxidation of the fuel gases.
  • the first phase of combustion takes place exclusively in the combustion chamber with the supply of fresh air, with which the oxygen required for combustion is introduced into the embers of the combustion chamber, and which is sometimes also referred to as primary air.
  • the subsequent gas-phase oxidation begins in the combustion chamber and continues in the flame tube, with complex chemical reactions taking place during which the combustion gases are oxidized and converted into carbon dioxide and water, but also into the pollutants mentioned above such as carbon monoxide, VOC, nitrogen oxides and fine dust particles.
  • the second phase of combustion is also completed and the combustion residues are discharged as flue gas via the flue gas discharge.
  • Combustion gas is therefore referred to below as the entirety of the gases entering the inflow area of the flame tube from the combustion chamber, in which oxidized and non-oxidized gas components of the gas-phase oxidation can be present, and as flue gas all of the gases flowing via the outflow area of the flame tube into the flue gas discharge line, in which the chemical processes directly attributable to the combustion, in particular oxidation, have largely been completed.
  • the course of combustion and the extent of the combustion residues that cause emissions depend on the chemical and physical framework conditions of combustion, which are partly controlled by control parameters of the heating device can be set.
  • this includes the amount of fuel, which in the case of a pellet heating system can be adjusted via the conveying speed of the screw conveyor for the pellets, and the amount of oxygen available for combustion, which can be adjusted via the speed of a fan, which is usually designed as an induced draft fan and draws in fresh air from an intake opening and feeds it to the combustion chamber via the fresh air line.
  • the combustion process can be controlled well, with electronic control devices usually being provided, which are based on a required heat output of the heating device and an actual state, which is measured using a temperature sensor. which is arranged, for example, in the combustion chamber or in the flame tube, regulate the amount of fuel and the speed of the fan accordingly.
  • Well-controlled combustion is characterized by a low level of combustion residues and therefore low emissions.
  • This secondary air is used for the targeted introduction of additional oxygen into an area of the combustion chamber characterized by gas-phase oxidation.
  • a stoichiometric excess of oxygen promotes the desired oxidation of carbon compounds to form carbon dioxide, it also promotes the undesired formation of nitrogen oxides.
  • filter devices to filter combustion residues from the flue gas in order to reduce emissions in this way. Nonetheless In particular, the reduction of particulate matter emissions from the combustion of solid fuels in appropriate heating systems poses a challenge.
  • the aim of the present invention is therefore to provide a heating device with which the emissions, in particular of fine dust, can be reduced.
  • Claim 1 relates to a method for reducing emissions from heating devices, in particular heating boilers, in which solid fuel, in particular biomass, is burned in a combustion chamber with the supply of fresh air, combustion gases formed in the combustion chamber being fed to a flame tube via an inflow area facing the combustion chamber , and flue gases formed from the combustion gases are fed via an outflow area of the flame tube to a subsequent flue gas discharge line, via which the emission-causing flue gases are discharged.
  • a gaseous medium is supplied to the flow of smoke and combustion gases occurring in the flame tube against the flow direction of this flow of smoke and combustion gases.
  • the gaseous medium is preheated by the flow of flue and combustion gases occurring in the flame tube.
  • the preheating prevents the flue gas from cooling too much, which would impair the complete oxidation of the carbon compounds.
  • a drop in temperature cannot be prevented even by preheating the supplied gaseous medium, this drop in temperature does not appear to be disadvantageous.
  • the Applicant suspects that the drop in temperature caused by the countercurrent supply of the gaseous medium has no appreciable effect on the oxidation of the carbon compounds, but prevents the formation of nitrogen oxides.
  • the gaseous medium can be a partial flow of the fresh air supplied to the combustion chamber, so that it is proposed that the gaseous medium be derived from the fresh air supplied to the combustion chamber.
  • a particularly effective reduction in emissions has been shown for embodiments in which a partial recirculation of flue gases into the combustion chamber is provided, in that some of the discharged flue gases are fed to the fresh air supplied to the combustion chamber.
  • a partial recirculation according to the invention, it can be into the flame tube introduced gaseous medium, a partial flow of the fresh air mixed with flue gases can be used, so that it is proposed that the gaseous medium is derived from the fresh air mixed with flue gases.
  • the gaseous medium upon entering the smoke and combustion gas flow of the flame tube, performs a rotational movement about this direction of movement superimposed on its movement against the flow direction of the smoke and combustion gas flow. This measure increases the residence time and the turbulence and thus promotes the complete oxidation of the carbon compounds.
  • a heating device for the implementation of the method according to the invention, in particular a heating boiler, with a combustion chamber connected to a fresh air line for the combustion of solid fuel, in particular biomass, and a flame tube with an inflow area facing the combustion chamber for combustion gases formed in the combustion chamber and an outflow area for flue gases formed from the combustion gases, which faces a subsequent flue gas outlet connected to a blower for discharging the flue gases.
  • a over the outflow area in the flame tube projecting supply line is provided with an outflow opening directed in the direction of the inflow area for a gaseous medium.
  • the outflow opening for the gaseous medium directed in the direction of the inflow area ensures that the gaseous medium is supplied to the flow of flue and combustion gases occurring in the flame tube against the flow direction of this flue and combustion gas flow, as provided according to the method according to the invention.
  • the gaseous medium is preheated with the help of the supply line projecting over the outflow area into the flame tube, which prevents the flue gas from cooling down too much.
  • preheating the gaseous medium cannot prevent a temperature drop, this temperature drop does not seem to be disadvantageous, since the temperature drop caused by the countercurrent supply of the gaseous medium has no significant effects on the oxidation of the carbon compounds , but prevents the formation of nitrogen oxides.
  • a simple embodiment of the apparatus provides, for example, that the feed line is designed as a feed tube running parallel to the axis of the flame tube.
  • This feed tube is preferably arranged deviating from the axis of the flame tube in the regions of the flame tube close to the axis.
  • a region close to the axis is understood to mean the inner half of the flame tube radius.
  • the supply line for the gaseous medium be connected to the fresh air line and the gaseous medium be a fresh air partial flow derived from the fresh air supplied to the combustion chamber.
  • the fresh air line for the partial recirculation of flue gases into the combustion chamber is connected to the flue gas discharge line and the supply line is connected to a section of the fresh air line that carries fresh air and flue gases, with the gaseous medium being a fresh air partial flow containing flue gases.
  • the fresh air line is conventionally connected to a blower in order to suck the fresh air into the combustion chamber and subsequently to suck out the smoke gases
  • the latter two designs have the advantage that the introduction of the gaseous medium is also regulated with the electronic control of the heating device , since the amount of fresh air is controlled by the blower, and thus more of the gaseous medium is blown countercurrently into the flame tube when the amount of fuel and the amount of fresh air and thus also the amount of substance in the combustion gases increase.
  • the supply line have a helically running gas guide section for the gaseous medium.
  • This helical gas flow section can either a supply pipe for the gaseous medium that is helically bent at least in its end section, or by a correspondingly helically shaped inner jacket of the supply pipe.
  • FIG. 1 a schematic representation of the structure of a heating device according to the invention for implementing the method according to the invention.
  • the 1 a boiler for heating a heat transfer medium by burning solid fuel, in particular biomass.
  • a combustion plate 2 is arranged in a combustion chamber 1, to which the solid fuel is supplied, for example in the form of free-flowing or pourable combustion material (eg pellets).
  • the ash collects below the burner plate 2 and is conveyed into the ash container by an ash screw.
  • the combustion chamber 1 has one in the 1 Lateral opening, not visible, through which pourable material to be burned can be conveyed from a storage container by means of a conveyor to the burner plate 2.
  • the conveying device can, for example, be a conveying screw that is automatically regulated with the aid of an electronic control device.
  • a flame tube 3 is arranged vertically above the combustion plate 2 , the inflow area 3a of which faces the combustion chamber 1 and opens into the combustion chamber 1 .
  • the flame tube 3 is of a suitable thickness and made of a thermally insulating material, preferably ceramic material or (refractory) concrete.
  • the flue gases R exit in an outflow region 3b of the flame tube 3 in an approximately laminar flow and enter a subsequent flue gas discharge line 4 water-filled spaces.
  • the heat transfer medium to be heated for heating purposes or for use as hot water is located in these rooms.
  • the flue gas discharge line 4 is connected to a fan 5 arranged on the exhaust gas side, which is designed as an induced draft fan and has a discharge opening 6 which can be connected to a chimney running outside the heating device, for example, in order to be able to discharge the flue gases R.
  • the fan 5 sucks the combustion gases V and the flue gases R from the combustion chamber 1 via the flame tube 3 and the flue gas outlet 4 in the direction of the chimney. Furthermore, fresh air F is sucked into the fresh air line 7 and into the combustion chamber 1 by the blower 5 .
  • the fresh air line 7 is also connected to the flue gas discharge line 4 for the partial recirculation of flue gases R into the combustion chamber 1 .
  • the fresh air line 7 thus has a section 7a which carries fresh air F mixed with flue gases R.
  • a projecting over the outflow area 3b in the flame tube 3 supply line 8 is arranged with an outflow opening directed in the direction of the inflow area for a gaseous medium G.
  • This supply line 8 is connected to the fresh air line 7 so that the gaseous medium G is a partial flow of fresh air which is derived from the fresh air F supplied to the combustion chamber 1 .
  • the fresh air line 7 in the embodiment shown is also connected to the flue gas discharge line 4 for returning flue gases R to the combustion chamber 1, the supply line 8 is connected to that section 7a of the fresh air line 7 that carries fresh air F mixed with flue gases R, which is 1 is indicated with an arrow labeled "F+R".
  • the gaseous medium G is therefore a fresh air partial flow containing flue gases R.
  • the feed line 8 is designed as a feed pipe running parallel to the axis of the flame tube and is arranged in the regions of the flame tube 3 close to the axis. Since the supply line 8 crosses the outflow area 3b of the flame tube 3, the gaseous medium G is already preheated before it is introduced into the flame tube 3. This preheating prevents the flue gas R from cooling down too much, which would impair the complete oxidation of the carbon compounds.
  • a temperature sensor 9 can also be seen, which measures the flue gas temperature in the flame tube 3 and is connected to the electronic control device mentioned above.
  • the introduction of the gaseous medium G is also regulated with the electronic control device of the heating device, so that more gaseous medium G is blown countercurrently into the flame tube 3 if the fuel quantity and the fresh air quantity and thus the amount of substance in the combustion gases V will also increase.
  • combustion gas V formed in the combustion chamber 1 is fed to the flame tube 3 via the inflow area 3a.
  • Combustion gas V refers to all of the gases entering the inflow area 3a of the flame tube from combustion chamber 1, in which oxidized and non-oxidized gas components of the gas-phase oxidation may be present
  • flue gas R refers to all of the gases flowing through outflow area 3b of flame tube 3 into the Flue gas discharge 4 flowing gases, in which the chemical processes directly attributable to the combustion, in particular oxidation, are largely completed.
  • Within the flame tube 3 is thus a flow of flue gases R and combustion gases V, which in the 1 is indicated with an upward pointing arrow "V+R".
  • This flow of flue gases R and combustion gases V is supplied in the flame tube 3 with the gaseous medium G against the direction of flow of this flue and combustion gas flow.
  • an increased residence time of the flue gases R and the combustion gases V in the flame tube 3 is brought about, as well as improved contact between the chemical reactants due to the turbulence caused by the countercurrent introduction.
  • the increased dwell time under the high temperatures of the flame tube 3 and the turbulence due to the countercurrent supply favor the complete oxidation of the carbon compounds and prevent the persistent formation of fine dust.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Claims (12)

  1. Procédé pour réduire les émissions d'installations de chauffage, en particulier de chaudières, dans lesquelles un combustible solide, en particulier de la biomasse, est brûlé dans une chambre de combustion (1) avec un apport d'air frais (F), dans lequel des gaz de combustion (V) formés dans la chambre de combustion (1) sont amenés à un tube-foyer (3) via une zone d'entrée (3a) tournée vers la chambre de combustion (1) et les gaz de fumée (R) issus des gaz de combustion (V) sont amenés, via une zone de sortie (3b) du tube-foyer (3), à une conduite d'évacuation des gaz de fumée (4) qui lui fait suite, par laquelle les gaz de fumée (R) causant les émissions sont évacués, caractérisé en ce qu'un fluide gazeux (G) est conduit dans le tube-foyer (3) vers le flux de gaz de fumée (R) et de gaz de combustion (V) qui se forme dans le tube-foyer (3), en sens inverse de la circulation de ce flux de fumée et de gaz de combustion (R, V).
  2. Procédé selon la revendication 1, caractérisé en ce que l'arrivée à contre-courant du fluide gazeux (G) se fait dans les zones du tube-foyer (3) proches de l'axe en s'écartant de l'axe du tube-foyer (3).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le fluide gazeux (G) est préchauffé par le flux de gaz de fumée et de gaz de combustion (R, V) qui se forme dans le tube-foyer (3).
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le fluide gazeux (G) est dérivé de l'air frais (F) amené à la chambre de combustion (1).
  5. Procédé selon la revendication 4, caractérisé en ce qu'un retour partiel des gaz de fumée (R) dans la chambre de combustion (1) est prévu, pour lequel les gaz de fumée (R) évacués sont partiellement conduits vers l'air frais (F) amené à la chambre de combustion (1), et le fluide gazeux (G) est dérivé de l'air frais (F) additionné de gaz de fumée (R).
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que le fluide gazeux (G), en entrant dans le flux de gaz de fumée et de gaz de combustion (R, V) du tube-foyer (3), effectue en plus de son mouvement en sens inverse de l'écoulement du flux de fumée et de gaz de combustion une rotation autour de ce sens de déplacement.
  7. Installation de chauffage, en particulier chaudière, avec une chambre de combustion (1) raccordée à une conduite d'air frais (7) pour la combustion de combustible solide, en particulier de biomasse, et avec un tube-foyer (3) muni d'une zone d'entrée (3a) tournée vers la chambre de combustion (1) pour des gaz de combustion (V) formés dans la chambre de combustion (1) et une zone de sortie (3b) pour des gaz de fumée (R) issus du gaz de combustion (V), qui est tournée vers une conduite d'évacuation des gaz de fumée (4) qui lui fait suite et qui est reliée à une soufflerie (5) pour évacuer les gaz de fumée (R), caractérisée en ce qu'une conduite d'arrivée (8) qui dépasse au-delà de la zone de sortie (3b) dans le tube-foyer (3), avec une ouverture de sortie dirigée vers la zone d'entrée (3a), est prévue pour un fluide gazeux (G).
  8. Installation de chauffage selon la revendication 7, caractérisée en ce que la conduite d'arrivée (8) est conformée comme un tuyau d'arrivée orienté parallèlement à l'axe du tube-foyer.
  9. Installation de chauffage selon la revendication 8, caractérisée en ce que la conduite d'arrivée (8) est disposée dans les zones du tube-foyer (3) proches de l'axe en s'écartant de l'axe du tube-foyer.
  10. Installation de chauffage selon l'une des revendications 7 à 9, caractérisée en ce que la conduite d'arrivée (8) est reliée à la conduite d'air frais (7) et le fluide gazeux (G) est un flux partiel d'air frais dérivé de l'air frais (F) amené à la chambre de combustion (1).
  11. Installation de chauffage selon la revendication 10, caractérisée en ce que la conduite d'air frais (7) est reliée avec la conduite d'évacuation des gaz de fumée (4) en vue du retour partiel de gaz de fumée (R) dans la chambre de combustion (1) et la conduite d'arrivée (8) est reliée à un segment (7a) de la conduite d'air frais (7) acheminant de l'air frais (F) et des gaz de fumée (R), le fluide gazeux (G) étant un flux partiel d'air frais qui contient des gaz de fumée (R).
  12. Installation de chauffage selon l'une des revendications 7 à 11, caractérisée en ce que la conduite d'arrivée (8) présente un segment d'acheminement de gaz en spirale pour le fluide gazeux (G).
EP20198099.2A 2019-09-26 2020-09-24 Dispositif chauffant Active EP3798513B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RS20220787A RS63512B1 (sr) 2019-09-26 2020-09-24 Uređaj za grejanje

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT508192019 2019-09-26

Publications (2)

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EP3798513A1 EP3798513A1 (fr) 2021-03-31
EP3798513B1 true EP3798513B1 (fr) 2022-06-01

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Country Link
EP (1) EP3798513B1 (fr)
DK (1) DK3798513T3 (fr)
ES (1) ES2925384T3 (fr)
PL (1) PL3798513T3 (fr)
RS (1) RS63512B1 (fr)

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DE3614177C2 (de) 1986-04-26 1996-09-26 Erk Eckrohrkessel Brennkammer
DE10021434A1 (de) 1999-05-03 2000-12-21 E T R En Technik Und Recycling Verbrennungsanlage
JP2007285570A (ja) 2006-04-14 2007-11-01 Sekisui House Ltd ペレットストーブ及び空気供給方法
DE102009014010B4 (de) 2009-03-19 2012-02-23 Georg Fischer Gmbh & Co. Kg Brenner für festes, stückiges Brennmaterial
EP2770255A2 (fr) 2013-02-25 2014-08-27 Anton Maggale Procédé de combustion de combustible
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EP3246652A1 (fr) 2016-05-18 2017-11-22 ÖKOFEN Forschungs- und Entwicklungsgesellschaft m.b.H. Dispositif de chauffage
AT520068A1 (de) 2017-05-16 2018-12-15 Oekofen Forschungs Und Entw M B H Heizeinrichtung

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3537842A1 (de) 1985-10-24 1987-04-30 Edmund Wagner Entgasungsanlage zur teilpyrolytischen verbrennung von festbrennstoffen
DE3614177C2 (de) 1986-04-26 1996-09-26 Erk Eckrohrkessel Brennkammer
DE4308001A1 (de) 1993-03-13 1994-09-15 Erk Eckrohrkessel Primärmaßnahme zur Schadstoffreduzierung von Rauchgasen aus einer Verbrennungsanlage
DE10021434A1 (de) 1999-05-03 2000-12-21 E T R En Technik Und Recycling Verbrennungsanlage
JP2007285570A (ja) 2006-04-14 2007-11-01 Sekisui House Ltd ペレットストーブ及び空気供給方法
DE102009014010B4 (de) 2009-03-19 2012-02-23 Georg Fischer Gmbh & Co. Kg Brenner für festes, stückiges Brennmaterial
DE202013012063U1 (de) 2012-12-04 2015-02-25 Ökofen Forschungs- Und Entwicklungsgesellschaft M.B.H. Heizkessel mit Wärmekraftmaschine
EP2770255A2 (fr) 2013-02-25 2014-08-27 Anton Maggale Procédé de combustion de combustible
EP3246652A1 (fr) 2016-05-18 2017-11-22 ÖKOFEN Forschungs- und Entwicklungsgesellschaft m.b.H. Dispositif de chauffage
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DK3798513T3 (da) 2022-08-22
PL3798513T3 (pl) 2022-10-03
RS63512B1 (sr) 2022-09-30
EP3798513A1 (fr) 2021-03-31

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