Drying plant

Abstract

The invention relates to a drying installation (1) for the continuous drying of a material in a moving belt (2). The installation comprises: - radiant or heating elements (6) burning gas, - a gas flow circulation system (8) configured to draw in combustion products generated by the radiant or heating elements (6). The gas flow circulation system (8) also includes an extraction duct (16) configured for venting at least a portion of the combustion products drawn in by the gas flow circulation system (8) from the installation (1).The installation (1) also includes a carbon monoxide and possibly nitrogen oxide treatment device (18), the treatment device (18) comprising an oxidation and possibly reduction catalyst (20) and being mounted on or downstream of said extraction line (16) in order to treat the carbon monoxide and possibly the nitrogen oxides contained in the combustion products. The installation (1) includes, in particular, a control means (22) configured to regulate the temperature of the catalyst (20) to a temperature greater than or equal to 130°C.

Description

Technical Field

[0001] The present invention relates to an installation for drying a moving web material, in particular paper. Prior art

[0002] Deposits on a continuous web material require heat treatment. Heat treatment must often be carried out without contact in order to preserve the quality of the surface finish of the web material or the deposit on it. This applies, for example, to paper webs that have undergone wet processing such as processing to produce art paper. Continuous heat treatment systems for web material are known that combine infrared radiation and convection heating. There are systems comprising gas-filled infrared emitters whose hot gas is drawn in by means of suction nozzles and discharged onto the web by means of blowing nozzles, creating a combined radiation and convection heat treatment system.

[0003] Document US 6,088,930 discloses a convection and radiation system for the heat treatment of a strip which moves opposite gas infrared radiant elements and elements blowing hot air onto this strip. The system comprises a succession of blowing elements separated from each other by at least one gas infrared radiant element. Each blowing element comprises on each side a suction element extending close to a gas infrared radiant element.

[0004] WO 2005 / 085729 describes a system resulting in reduced consumption of mechanical energy and reduced loss of thermal energy, reduced investment and operating costs, and requiring less space. This drying installation is characterized in that the suction, and possibly blowing, devices of the mass transfer system comprise at least one suction, and possibly blowing, device, installed opposite the passband with respect to corresponding suction and blowing ducts which extend at least in the transverse direction of the band, and arranged to suck and / or blow said combustion products in such a way as to optimize the vector averages. The vectors represent the respective trajectories of the different jets of sucked and / or blown combustion products.

[0005] In this way, the heat transfers between the combustion products and the passage plane can be maximized, and it is also possible to obtain an extremely compact drying installation in which the combustion products are blown at the highest possible temperature. US 2,743,529 discloses a method, and an apparatus, for controlling the concentration of combustible materials in the exhaust gases of drying ovens. Statement of the invention

[0006] The present invention aims to improve the operation of the installations described above. In particular, the present invention aims to provide an installation for drying a moving strip material, which is more environmentally friendly. More specifically, the present invention aims to provide an installation for drying a moving strip material, having a lower ecological impact.

[0007] Thus, according to one aspect, there is provided a drying installation for the continuous drying of a moving web material. The installation comprises: radiant or heating elements, burning gas or a gas mixture, for example a premix of gas and air, a gas flow circulation system, or mass transfer system, for example natural or forced convection, configured to suck combustion products generated by the radiant or heating elements.

[0008] The gas flow circulation system also comprises an extraction pipe configured for the evacuation from the installation of at least part of the combustion products sucked in by the gas flow circulation system.

[0009] The installation also comprises a device for treating the combustion products, the treatment device comprising an oxidation and / or reduction catalyst, and being mounted on or downstream of said extraction pipe in order to treat respectively the carbon monoxide and / or the nitrogen oxides contained in the combustion products.

[0010] The catalyst may comprise, for example, a catalyst for the oxidation of carbon monoxide to carbon dioxide and / or a catalyst for the reduction of nitrogen oxides NOx to nitrogen N2.

[0011] The treatment device allows the gases released by the installation to be treated, in order to limit the quantity of carbon monoxide and / or nitrogen oxides present there.

[0012] The installation includes in particular a regulation means configured to regulate the temperature of the catalyst to a temperature greater than or equal to 130°C, preferably greater than or equal to 150°C, and more preferably greater than or equal to 200°C, or even 300°C or 400°C.

[0013] Thus, the installation is configured to operate the treatment device at its optimal temperature conditions. More specifically, the installation is configured to operate the treatment device at a temperature that allows for high efficiency throughout the operation of the installation.

[0014] Preferably, the regulating means is configured to heat the catalyst to a temperature greater than or equal to 130°C, preferably greater than or equal to 150°C, and more preferably greater than or equal to 200°C, or even 300°C or 400°C, and / or the regulating means is configured to maintain the catalyst at a temperature greater than or equal to 130°C, preferably greater than or equal to 150°C, and more preferably greater than or equal to 200°C, or even 300°C or 400°C.

[0015] More specifically, the installation is configured to operate the catalyst under its optimal temperature conditions, so as to obtain a high efficiency of the oxidation and / or reduction reaction, throughout the operation of the installation. Heating the catalyst to very high temperatures, in particular 300°C or 400°C, can also make it possible to obtain, at the outlet of the treatment device, the same efficiency but with fewer precious metals in the catalyst than for a treatment device operating at a lower temperature.

[0016] Preferably, the regulating means comprises a heating element, such as an electrical element and / or a heat exchanger and / or an inductive means, configured to supply heat to the catalyst.

[0017] The electrical or inductive heating means, for example a heating resistor or a coil, makes it possible to obtain a rapid and controlled increase in the temperature of the catalyst. Such an electrical or inductive heating means is particularly suitable during periods of transient operation of the installation, for example at start-up, during which the combustion products to be treated may have a temperature lower than that desired for the operation of the treatment device. In particular, the inductive heating means is particularly advantageous for concentrating, by choice of material and / or geometry, the transfer of energy to locations on the catalyst where the thermal energy will be most useful.Similarly, the heat exchanger can be used to reuse calories available elsewhere, particularly in the installation, to increase the temperature of the catalyst, while limiting the energy consumption, particularly electricity, of the installation.

[0018] Preferably, the regulation means comprises control means configured to control the radiating or heating elements, and / or the gas flow circulation system and / or the treatment device, in order to regulate the temperature of the catalyst.

[0019] The control means may in particular be configured to control valves, flaps, etc., in particular in the gas flow circulation system, or even the power supply, power, distribution, etc., of the radiating or heating elements.

[0020] Preferably, the regulating means comprises at least one carbon monoxide and / or nitrogen oxide sensor mounted upstream or downstream of the catalyst and configured to respectively measure the quantity of carbon monoxide and / or nitrogen oxides contained in the combustion products upstream and / or downstream of the catalyst. For example, the regulating means may comprise a carbon monoxide sensor, and possibly nitrogen oxides, mounted upstream of the catalyst, and a carbon monoxide sensor, and possibly nitrogen oxides, mounted downstream of the catalyst.

[0021] Carbon monoxide and nitrogen oxide sensors are used to determine the quantities of carbon monoxide and nitrogen oxides present in the combustion products to be treated and feeding the treatment device. Such sensors also make it possible to determine the effectiveness of the treatment device in oxidizing carbon monoxide or reducing nitrogen oxides. For example, such sensors can identify normal or abnormal wear of the treatment device, or an anomaly or even a drift in the operation of the treatment device.

[0022] Preferably, the regulation means is configured to trigger an alert when the quantity of carbon monoxide and / or nitrogen oxides contained in the combustion products downstream of the catalyst is greater than a defined threshold.

[0023] Preferably, the regulation means is configured to maintain the catalyst at a temperature greater than or equal to 130°C, preferably greater than or equal to 150°C, and more preferably greater than or equal to 200°C, or even 300°C or 400°C, when the quantity of carbon monoxide and / or nitrogen oxides contained in the combustion products upstream of the catalyst is greater than a defined threshold.

[0024] In particular, if the quantity of carbon monoxide and / or nitrogen oxides present in the combustion products to be treated is relatively low, in particular compared to one or more defined thresholds, the treatment device may be configured not to regulate the temperature of the catalyst, in particular in order to avoid any unnecessary energy expenditure.

[0025] Preferably, the installation includes means for adding fresh air, for example into the gas or gas mixture supplying the radiant or heating elements and / or into the combustion products.

[0026] Preferably, the installation also comprises means for adding fresh air, configured in particular to modify the quantity of fresh air present in the combustion products, and control means configured to control said means for adding fresh air.

[0027] The addition of fresh air may be carried out upstream of the combustion, for example in the gas or gas mixture supplying the radiant or heating elements, or downstream of the combustion, for example in the combustion products formed by the radiant or heating elements. Thus, the means for adding fresh air may be a controlled valve modifying the composition of the gas, or gas mixture, supplying the radiant or heating elements, or may comprise a valve mounted on the extraction pipe and / or a cooling air inlet in the installation.

[0028] The means for adding fresh air may be controlled by the control means as a function of the temperature of the combustion products, and / or as a function of the composition of the combustion products.

[0029] The installation according to the present invention comprises means for adding fresh air to the gas, or gas mixture, supplying the radiating or heating elements, and control means controlling the quantity of fresh air added to the gas supplying the radiating or heating elements as a function of the temperature or the composition of the combustion products entering the oxidation and possibly reduction catalyst.

[0030] Preferably, the installation also comprises means for adding fresh air to the gas supplying the radiant or heating elements, and control means configured to reduce the quantity of fresh air added to the gas supplying the radiant or heating elements, when the quantity of carbon monoxide contained in the combustion products upstream of the catalyst is below a defined threshold.

[0031] The amount of air in the gases supplying the radiant or heating elements is generally greater than that required by the stoichiometry of the combustion reaction, in order to ensure complete combustion. However, if the amount of carbon monoxide in the combustion products is low, this indicates that complete combustion is taking place: it is then possible to reduce the amount of fresh air supplying the radiant or heating elements, provided that the amount of carbon monoxide in the combustion products remains low.

[0032] Preferably, the regulating means comprises said control means. Alternatively, the control means may comprise manual control means.

[0033] Preferably, the regulating means is configured to regulate the temperature and / or the composition of the combustion products entering the catalyst. For example, the regulating means may be configured to heat the combustion products, in particular without modifying their composition. In other words, the combustion products are heated by the regulating means while maintaining the same composition.

[0034] The installation can also control the temperature of the catalyst via the combustion products to be treated, by controlling the temperature of these. Such regulation is particularly advantageous during continuous operation of the installation, when the temperature of the combustion products to be treated remains substantially constant over time and can therefore be modified to the desired control temperature for the treatment device. By regulating the temperature of the combustion products feeding the treatment device to the desired temperature for the operation of the catalyst, it then becomes possible to obtain the desired operation for the latter, with a substantially similar temperature.

[0035] Preferably, the installation also comprises means for determining the temperature of the catalyst, for example a temperature sensor mounted upstream of the catalyst, for example in the extraction pipe. The regulation means may comprise said means for determining the temperature of the catalyst.

[0036] Preferably, the installation also comprises means for adding fresh air to the combustion products and / or to the gas supplying the radiant or heating elements, a temperature sensor mounted in the extraction pipe, upstream of the catalyst, and control means monitoring the quantity of fresh air added to the combustion products and / or to the gas supplying the radiant or heating elements.

[0037] In order to control the temperature of the combustion products feeding the catalyst, the installation may include a temperature sensor mounted upstream of the catalyst, and means for adding fresh air into the installation, in order to reduce the temperature of the gases feeding the catalyst. The addition of fresh air can thus be made into the combustion products feeding the catalyst, or into the gases feeding the radiating or heating elements.

[0038] Preferably, the means for adding fresh air comprise a controlled valve mounted on the extraction pipe, and configured to adjust the quantity of fresh air mixed with the combustion products.

[0039] The valve control adjusts the amount of fresh air added to the combustion products, thereby changing their temperature. This adjusts the temperature of the combustion products just before they enter the catalyst.

[0040] Preferably, the means for adding fresh air comprise a cooling air inlet into the installation, preferably close to the radiating or heating elements.

[0041] Another possibility for modifying the fresh air content of the combustion products, and therefore the temperature of the combustion products, is to modify the cooling air used in the installation, particularly near the radiant or heating elements. This quantity of cooling air can also be adjusted to obtain the desired temperature for the combustion products entering the catalyst.

[0042] Preferably, the regulating means comprises said control means. Alternatively, the control means may comprise manual control means.

[0043] Preferably, the catalyst comprises a metallic or ceramic honeycomb support, with at least one portion coated with one or more precious metals and / or with a means for injecting a reducing agent, for example ammonia.

[0044] Such supports, well known to those skilled in the art, make it possible to obtain very high active surfaces for a defined volume, which makes it possible to obtain higher yields.

[0045] Preferably, the installation also includes a catalyst cleaning device.

[0046] The unclogging device is intended to eliminate any accumulation of residues within the catalyst that may block certain channels for the gas to be treated. In order to maintain the efficiency of the catalyst, the unclogging device can be used at regular intervals or when the pressure drop across the catalyst exceeds a defined threshold, in order to restore its nominal performance.

[0047] Preferably, the catalyst unclogging device is a device for circulating a pressurized fluid, for example compressed air, through the catalyst.

[0048] Compressed air can be used to unclog the catalyst. In particular, the sudden injection of compressed air into the inlet gases creates a sudden overpressure at the catalyst inlet, which can break up the accumulations of residue and evacuate them with the rest of the treated gases. This results in a catalyst operating as intended. Brief description of the drawings

[0049] [ Fig. 1 ] There figure 1 represents a schematic view of a drying installation with a treatment device, according to the invention. Description of the embodiments

[0050] There figure 1 schematically illustrates an example of a drying installation 1 for the continuous drying of a moving web material 2 according to the invention. The web material 2 moves in the direction indicated by the arrow 4 through the drying installation 1.

[0051] The example drying installation 1 preferably comprises several gas radiation emitters 6, supplied with gas such as a premixture of gas and air, installed along the line of movement of the strip material 2, and a gas flow circulation system, or mass transfer system, 8 mounted downstream, in the direction of movement of the strip material 2, of the emitters 6 and configured to allow the circulation of a gas flow, for example by natural or forced convection.

[0052] Conventionally, the gas flow circulation system 8 comprises suction nozzles 10 and an extraction duct 12 for sucking hot air, or combustion products, at the moving web material 2. The extraction duct 12 is provided for the evacuation from the drying installation 1 of the sucked combustion products via a central fan 14 of the drying installation 1 and one or more extraction ducts 16. The combustion products can thus be discharged outside, into the atmosphere, for example via a chimney, but can also, at least in part, be reused in another system. Thus, the combustion products leaving the treatment device as described below can be rerouted into the drying installation itself, for example to a heat exchanger, or to another installation, for example an air dryer.

[0053] The gas flow circulation system 8 may also comprise suction nozzles for sucking hot gases from the moving web material into a suction duct. The gas flow circulation system 8 may also comprise blowing nozzles for blowing, for example, at least a portion of the hot gas sucked into a blowing duct toward the moving web material, the blowing duct being in fluid communication with the suction duct, in particular via a fan. Such suction nozzles, and possibly blowing nozzles, in combination with the corresponding ducts, make it possible to recirculate the hot air present on the surface of the moving web material 2 during drying, so as to increase the proportion of water vapor in the air before it is evacuated from the installation 1.

[0054] In order to limit the impact of the gases discharged by the installation 1, the latter also comprises a combustion product treatment device 18 mounted on the extraction pipe 16, for example downstream of the central fan 14. The treatment device 18 aims in particular to limit the content of carbon monoxide and possibly nitrogen oxides present in the combustion products discharged by the installation 1, before they are released into the open air.

[0055] For this purpose, the treatment device 18 may comprise an oxidation and possibly reduction catalyst 20, mounted on the extraction pipe 16 and making it possible to react the carbon monoxide with an oxidizing compound, for example the oxygen in the air, to transform it into carbon dioxide, and possibly to react the nitrogen oxides with a reducing compound, for example ammonia or urea injected into the catalyst 20. The catalyst 20 may thus be arranged, in a conventional manner, on a support having a high active, or contact, surface. The catalyst 20, present on the surface of the support, allows the implementation of the reaction of oxidation of carbon monoxide into carbon dioxide and / or reduction of nitrogen oxides into nitrogen. The support may in particular be a metal or ceramic support, and have a honeycomb geometry.The catalyst may comprise an oxidation catalyst with precious metals and / or a reduction catalyst associated with a means for injecting a reducing agent such as ammonia or urea. For example, the catalyst 20 may comprise a first portion with a reduction catalyst, associated with a means for injecting a reducing agent, and a second portion with an oxidation catalyst. Preferably, the catalyst comprises a reduction catalyst, a portion of which is coated with precious metals to oxidize the carbon monoxide.

[0056] However, in order to allow high efficiency of the catalyst 20 during the different operating phases of the drying installation 1, the treatment device 18 also comprises a means 22 for regulating the temperature of the catalyst 20. The regulating means 22 is configured to allow the catalyst 20 to be within its nominal operating temperature range, for example at a temperature greater than or equal to 130°C, preferably greater than or equal to 150°C, and more preferably greater than or equal to 200°C. Alternatively, or in addition, the regulating means 22 may be configured to allow the catalyst 20 to be at a temperature greater than or equal to 300°C, or even 400°C, so as to increase its efficiency or so as to obtain a similar efficiency with a catalyst less rich in precious metal but operating at a lower temperature.

[0057] For this purpose, the regulation means 22 can be configured to allow a rapid modification of the temperature of the catalyst 20 when it is outside said nominal temperature range, and / or to allow the temperature of the catalyst 20 to be maintained when it is within said nominal temperature range.

[0058] For example, the regulating means 22 may be configured to heat the catalyst 20 to a temperature greater than or equal to 130°C, preferably greater than or equal to 150°C, and more preferably greater than or equal to 200°C or even 300°C or 400°C, and / or to maintain the oxidation catalyst at a temperature greater than or equal to 130°C, preferably greater than or equal to 150°C, and more preferably greater than or equal to 200°C, or even 300°C or 400°C.

[0059] Thus, the regulating means 22 may comprise a heating element 24, such as an electrical element and / or a heat exchanger, for example mounted in or in contact with the catalyst support 20, in order to heat the latter when its temperature is too low, in particular during the start-up phases of the installation 1. The heating element 24 is thus used temporarily, in order to put the catalyst in its nominal operating conditions until it can remain there independently. Furthermore, the heat exchanger can be advantageously used to recover the calories released elsewhere in the installation and to supply them to the catalyst in order to heat it without increasing the energy consumption of the installation.

[0060] The regulating means 22 can also regulate the temperature of the combustion products feeding the catalyst 20, so that they have a temperature included in the nominal temperature range of the catalyst 20, so as to put or maintain the catalyst 20 in its nominal temperature range.

[0061] In order to modify the temperature of the combustion products conveyed by the extraction pipe 16 and supplying the catalyst 20, the regulation means 22 may comprise a control means 26 configured to add fresh air into the combustion products, either before the combustion of the gas by the emitters 6, or between the combustion and the suction by the gas flow circulation system 8, or after the suction by the gas flow circulation system 8.

[0062] Thus, the control means 26 can increase or decrease the quantity of fresh air mixed with the gas supplying the emitters 6, before their combustion, so as to obtain less or hotter combustion products. Similarly, when the quantity of carbon monoxide in the combustion products supplying the treatment device 18 is lower than a defined threshold, the control means 26 can also decrease the quantity of fresh air supplying the emitters 6, since the combustion is already taking place completely.

[0063] Alternatively, or in addition, the control means 26 can increase or decrease the quantity of fresh cooling air introduced into the installation 1 between the gas emitters 6 and the gas flow circulation system 8. Such cooling air, by mixing with the combustion products before suction by the gas flow circulation system 8, makes it possible to obtain a modification of the temperature of the gases conveyed by the extraction pipe 16 to the catalyst 20.

[0064] Finally, alternatively or in addition to the embodiments described above, the control means 26 can also be configured to add or not add fresh air to the combustion products, at the extraction pipe 16 supplying the catalyst 20. For example, the treatment device 18 can comprise a controlled valve 28 for adding fresh air which is mounted on the extraction pipe 16, upstream of the catalyst 20. The controlled valve 28 is connected to a fresh air inlet and allows, according to the command given by the control means 26, to add or not, or to modify a quantity of fresh air added to the combustion products, so as to change the temperature thereof.

[0065] In order to determine the control of the controlled valve, or of the fresh air supplies of the emitters 6 or of the cooling means of the installation 1, the treatment device 18 may comprise one or more temperature sensors, one or more carbon monoxide sensors and / or one or more nitrogen oxide sensors (not shown), mounted at different points of the installation 1, for example upstream, on or downstream of the catalyst 20 but also at the extraction pipe 16. The control means 26 can then determine a control from the information provided by this or these sensors.

[0066] The control means 26 can also directly control the power of the radiating or heating elements 2, for example individually or globally. Thus, the control means 26 can regulate the temperature of the catalyst by modifying the power or the number of the radiating or heating elements 6 operating in the installation 1, or the distribution of the radiating or heating elements 6 operating in the installation 1. Similarly, the frequency or the circulation paths of the gas flows in the circulation system 8 can be modified by the control means in order to obtain the desired temperature for the combustion products entering the catalyst 20.

[0067] Finally, and in order to limit the clogging phenomena of the catalyst 20, in particular of the channels of the support, the treatment device 18 may comprise an unclogging device 30. The unclogging device 30 may for example be a device for circulating a pressurized fluid, for example compressed air, through the catalyst and be mounted upstream or downstream of the catalyst 20. By creating a significant pressure difference between the inlet and the outlet of the catalyst 20, the unclogging device 30 can then reduce or break the plugs likely to have formed in the channels of the support, and evacuate them outside the catalyst 20.

[0068] The use of the unclogging device 30 can in particular be controlled as a function of the operating time of the catalyst 20, for example with an unclogging procedure planned every 20, 30 or 50 hours of operation of the catalyst 20. Alternatively, the unclogging device 30 can be controlled as a function of the evolution of the pressure drop between the inlet and the outlet of the catalyst 20, for example when such a pressure drop exceeds a defined threshold or increases, for a defined time, by a defined value.

[0069] Thus, thanks to the invention, it becomes possible to effectively and long-term treat combustion products discharged by a drying installation for a moving strip material. In particular, the treatment device is configured to operate for as long as possible in its nominal zone, including during transient periods, in particular start-up. Similarly, prolonged operation is ensured thanks to the unclogging device which makes it possible to maintain the catalyst capable of treating the combustion products conveyed by the extraction pipe.

Claims

1. A drying installation (1) intended for the continuous drying of a moving web material (2), the installation (1) comprising: - radiating or heating elements (6), burning the gas, - a gas flow circulation system (8) configured to suction combustion products generated by the radiating or heating elements (6), in which the gas flow circulation system (8) also includes an extraction pipe (16) configured for the evacuation from the installation, of at least part of the combustion products suctioned by the gas flow circulation system (8), the installation (1) also includes a device (18) for treating the combustion products, in particular carbon monoxide and optionally nitrogen oxides, the treatment device (18) including an oxidation and optionally reduction catalyst (20), in particular for oxidizing the carbon monoxide and optionally reducing the nitrogen oxides, and being mounted on or downstream of said extraction pipe (16) in order to treat the carbon monoxide and optionally the nitrogen oxides contained in the combustion products, the installation (1) also includes a regulation means (22) configured to regulate the temperature of the catalyst at a temperature greater than or equal to 130°C, preferably greater than or equal to 150°C, and more preferably greater than or equal to 200°C, or even 300°C or 400°C, and characterized in that the installation comprises means for adding fresh air to the gas, or gas mixture, supplying the radiating or heating elements, and control means controlling the amount of fresh air added to the gas supplying the radiating or heating elements, according to the temperature of the combustion products entering the oxidation and optionally reduction catalyst.

2. The installation (1) according to claim 1, wherein the regulation means (22) is configured to heat the oxidation and optionally reduction catalyst (20) to a temperature greater than or equal to 130°C, preferably greater than or equal to at 150°C, and more preferably greater than or equal to 200°C or even 300°C or 400°C, and / or wherein the regulation means (22) is configured to maintain the oxidation and optionally reduction catalyst (20) at a temperature greater than or equal to 130°C, preferably greater than or equal to 150°C, and more preferably greater than or equal to 200°C, or even 300°C or 400°C.

3. The installation (1) according to claim 1 or 2, wherein the regulation means (22) includes a heating element (24), such as an electric element and / or a heat exchanger, configured to supply heat to the oxidation and optionally reduction catalyst (20).

4. The installation (1) according to any one of the preceding claims, wherein the regulation means (22) includes at least one carbon monoxide, and optionally nitrogen oxide sensor, mounted upstream and / or downstream of the catalyst (20) and configured to measure the amount of carbon monoxide and optionally nitrogen oxides contained in the combustion products upstream and / or downstream of the catalyst (20), for example one carbon monoxide, and optionally nitrogen oxide sensor, mounted upstream of the catalyst (20) and one carbon monoxide, and optionally nitrogen oxide sensor, mounted downstream of the catalyst (20).

5. The installation (1) according to the preceding claim, wherein the regulation means (22) is configured to maintain the catalyst (20) at a temperature greater than or equal to 130°C, preferably greater than or equal to 150°C, and more preferably greater than or equal to 200°C, or even 300°C or 400°C, when the amount of carbon monoxide, and optionally nitrogen oxides, contained in the combustion products upstream of the catalyst (20), is greater than a defined threshold.

6. The installation (1) according to claim 4 or 5, wherein the control means (26) are configured to reduce the amount of fresh air added to the gas supplying the radiating or heating elements (6) when the amount of carbon monoxide contained in the combustion products upstream of the catalyst (20), is below a defined threshold.

7. The installation (1) according to any one of the preceding claims, wherein the regulation means (22) is configured to regulate the temperature of the combustion products entering the oxidation and optionally reduction catalyst (20).

8. The installation (1) according to any one of the preceding claims, wherein the regulation means (22) includes a temperature sensor mounted in the extraction pipe (16), upstream of the oxidation and optionally reduction catalyst (20), and wherein control means (26) controls means for adding fresh air according to the temperature provided by said temperature sensor.

9. The installation (1) according to the preceding claim, wherein the means for adding fresh air include a controlled valve (28) mounted on the extraction pipe (16), and configured to adjust the amount of fresh air mixed with the combustion products.

10. The installation (1) according to claim 8 or 9, wherein the means for adding fresh air include a cooling air inlet in the installation, preferably close to the radiating or heating elements (6).

11. The installation (1) according to any one of the preceding claims, wherein the oxidation and optionally reduction catalyst (20) includes a metallic or ceramic support in the form of a honeycomb, with at least one portion coated with one or more precious metals and optionally with a means for injecting a reducing agent, for example ammonia.

12. The installation (1) according to any one of the preceding claims, also including a device (30) for unclogging the oxidation and optionally reduction catalyst (20).

13. The installation (1) according to the preceding claim, wherein the device (30) for unclogging the oxidation and optionally reduction catalyst (20) is a device for circulating a pressurized fluid, for example compressed air, through the oxidation and optionally reduction catalyst (20).