Combustion system using as oxidizer a mixture of molecular oxygen and dehumidified gas obtained from combustion fumes

Abstract

The present invention is a combustion system comprising a unit (3) for producing an oxidizing gas (GC), a combustion device (1), a condensation unit (4) for condensing the combustion fumes (F;F') by contacting the combustion fumes (F;F') with at least one cooling liquid (L), recycling means (5) and a unit (6) for providing molecular oxygen. The oxidizing gas production unit (3) is capable of supplying the combustion device (1) with the oxidizing gas (GC) resulting from the mixing of molecular oxygen with the recycled portion (GDR) of the dehumidified gas (GD). The combustion system further comprises a temperature (T L The gas dehumidifier (GD) comprises a conditioning unit (7) having the function of automatically regulating the dehumidified gas (GDR) and / or means for heating the recycled part (GDR) of the dehumidified gas (GD).

Description

[Technical field]

[0001] The present invention relates to the field of combustion of fuels with an oxidizer from a mixture of molecular oxygen (O2) and dehumidified gases obtained from combustion fumes. [Background technology]

[0002] Conventional combustion consists in mixing fuel with air (the oxidant) in a combustion device (furnace, boiler, etc.) under high temperature conditions to create oxidation. The reaction is exothermic and self-sustaining. Air contains 18% molecular oxygen (O2) and the volume of air used is controlled so that the amount of molecular oxygen is sufficient for combustion.

[0003] In conventional combustion, the combustion fumes are mainly composed of molecular nitrogen (N2), water vapor (H2O) and carbon dioxide (CO2). If it is desired to capture CO2 from these fumes, it is easy to remove the water vapor by condensing these combustion fumes and collecting the water in liquid form. On the other hand, the main difficulty lies in separating the nitrogen and carbon dioxide. Moreover, in conventional combustion, depending on the type of fuel used, the combustion fumes also contain more or less other polluting gases, such as SOx (sulfur oxides), NOx (nitrogen oxides), HCl (hydrogen chloride), HF (hydrogen fluoride), etc. As a result, if it is desired to capture CO2 from these fumes, it is also necessary to separate the CO2 from these other pollutants.

[0004] Several solutions have been considered for capturing CO2 from fumes from conventional combustion, but their costs remain prohibitively high.

[0005] In order to reduce the emission of pollutants in combustion fumes, it is known to replace the conventional combustion described above with what is referred to as "oxycombustion", in which air (the oxidant) is replaced with pure molecular oxygen in a stoichiometric proportion, the number of oxygen atoms being equal to those required to oxidize all of the atoms of the fuel.

[0006] The production of molecular oxygen for carrying out oxycombustion can be obtained in known manner, for example by electrolysis of water or by cryogenics.

[0007] For example, in the case of the oxidative combustion of methane (CH4), combustion fumes are produced that consist of 1 / 3 volume of CO2 and 2 / 3 volume of water. In the case of other fuels, pollutants resulting from the combustion such as HCl, SOx, etc. will also be present. If the fuel does not contain nitrogen, the fumes will advantageously not contain NOx.

[0008] The chemical reaction equation for the oxycombustion of methane (CH4) is as follows: CH4 + 2O2 → CO2 + 2H2O 891 kJ per mole of CH4

[0009] This means that every mole of CH4 produces 891 kJ of external energy.

[0010] For other fuels, the reactions are similar to the appearance of other compounds if the fuel contains atoms other than carbon and hydrogen.

[0011] In the case of, for example, oxycombustion of methane, it is significantly easier to capture the CO2: for this purpose, it is sufficient to condense the water of the fumes by a cooling or drying process in order to obtain the CO2 in the gaseous state.

[0012] Therefore, it is now known to use condensers to condense oxy-combustion fumes to facilitate capture of CO2.

[0013] However, a significant difficulty with oxy-combustion is the difficulty in controlling the combustion because, unlike conventional combustion, oxy-combustion temperatures can quickly and uncontrollably become very high within the combustion chamber, to a degree that conventional combustion equipment cannot withstand.

[0014] To overcome this difficulty, oxy-combustion has already been improved by recycling at least a portion of the combustion fumes, including CO2, by mixing them with pure molecular oxygen to obtain an oxidizing gas (O2-CO2), which can advantageously reduce the combustion temperature.

[0015] This improvement allows for more easily controlled molecular oxygen-based combustion compared to oxy-combustion, which uses only pure molecular oxygen as the oxidizer, while reducing pollutant emissions compared to conventional combustion and facilitating CO2 capture.

[0016] Solutions that recycle a portion of the combustion fumes, if the combustion fumes necessarily contain water vapor (H2O), will inevitably introduce moist oxidizing gases into the combustion equipment, the water content of which is too high and / or uncontrolled, which is detrimental to the reliability and proper functioning of the combustion equipment and may even cause dangerous corrosion of the combustion equipment over time.

[0017] Moreover, when the fuel used produces combustion fumes containing pollutants such as, for example, SOx (sulphur oxides), NOx (nitrogen oxides), HCl (hydrogen chloride), HF (hydrogen fluoride), recycling a portion of the combustion fumes would result in a harmful increase in the concentration of the pollutants in the combustion fumes over time and is therefore not an option. The above-mentioned solution of recycling a portion of the combustion fumes is therefore in fact only considered for combustion fumes that consist only of carbon dioxide and water and are free of pollutants, such as those obtained by the combustion of saturated hydrocarbons of the alkane type (methane, propane, etc.) with molecular oxygen. Summary of the Invention [Problem to be solved by the invention]

[0018] The main object of the invention is to propose a combustion system including a combustion device that allows the combustion of a fuel with an oxidant obtained by mixing molecular oxygen (O2) and a gas obtained from at least a portion of the combustion fumes, and that allows a good control of the quality of the oxidizing gas used in the combustion device. [Means for solving the problem]

[0019] The subject of the invention is a combustion system comprising a unit for producing an oxidizing gas, a combustion device enabling the combustion of a fuel with said oxidizing gas, a condensation unit suitable for condensing the combustion fumes produced by the combustion device by contacting the combustion fumes with at least one cooling liquid to produce a dehumidified gas (i.e. a gas having a lower absolute humidity than the combustion fumes at the inlet of the condensation unit), recycling means enabling at least one recycled portion of the dehumidified gas at the outlet of the condensation unit to be fed to the oxidizing gas production unit, and a unit for providing molecular oxygen enabling the supply of molecular oxygen to the oxidizing gas production unit. The oxidizing gas production unit enables the supply of the oxidizing gas resulting from the mixing of molecular oxygen with the recycled portion of said dehumidified gas to the combustion device. The combustion system also comprises a regulation unit, which has the function of automatically regulating the temperature of the cooling liquid of the condensation unit.

[0020] The combustion system also has the following technical features (a) and / or (b): (a) the combustion system also comprises at least one sensor enabling the measurement of the absolute humidity or the relative humidity in the recycled portion of the dehumidified gas (GDR), and / or at least one sensor enabling the measurement of the absolute humidity or the relative humidity in the oxidizing gas (GC), and / or at least one sensor enabling the measurement of the absolute humidity or the relative humidity in the combustion fumes, the adjustment unit being capable of automatically adjusting the temperature of the cooling liquid of the condensing unit based on the absolute humidity or the relative humidity measured by said sensor at least in the recycled portion of the dehumidified gas (GDR), and / or based on the absolute humidity or the relative humidity measured by said sensor at least in the oxidizing gas (GC), and / or based on the absolute humidity or the relative humidity measured by said sensor at least in the combustion fumes, and / or (b) the combustion apparatus is characterized by an operating range defining a maximum absolute or relative humidity and a minimum absolute or relative humidity, and the regulating unit has the function of automatically regulating the temperature of the condensing unit coolant so as to maintain the absolute or relative humidity of the oxidizing gas (GC) within said operating range of the combustion apparatus.

[0021] Automatic regulation of the temperature of the cooling liquid of the condensing unit makes it possible to control the absolute humidity in the recycled portion of the dehumidified gas before it is introduced into the oxidizing gas production unit. Heating of the recycled portion of the dehumidified gas makes it possible to increase the temperature of the recycled portion of the dehumidified gas before it is introduced into the oxidizing gas production unit, advantageously moving the temperature of the recycled portion of the dehumidified gas away from its dew point.

[0022] In particular, the combustion system of the present invention may include the following additional optional features, either alone or in combination with each other: The regulating unit has the function of automatically regulating the temperature of the cooling liquid of the condensing unit so as to maintain the absolute or relative humidity of the recycled portion of the dehumidified gas within a predefined operating range. The regulating unit has the function of automatically regulating the temperature of the cooling liquid of the condensing unit so as to maintain the absolute humidity or relative humidity of the oxidizing gas within a predefined operating range. The regulating unit has the function of automatically regulating the temperature of the cooling liquid of the condensing unit so as to maintain the absolute or relative humidity of the combustion fumes within a predefined operating range. The regulating unit has the function of automatically regulating the temperature of the coolant of the condensing unit so as to maintain the temperature of the coolant of the condensing unit at a predefined temperature or within a predefined temperature range. the combustion system preferably comprises heating means suitable for heating a recycled portion of said dehumidified gas by means of calories taken from the combustion fumes; the heating means are suitable for heating the recycled portion of said dehumidified gas (GDR) such that the temperature of the oxidizing gas at the inlet of the combustor is within a predefined temperature range and / or such that the temperature of the oxidizing gas at the inlet of the combustor is above the dew point of the oxidizing gas. - the condensing unit comprises at least one condensing device comprising a bath of cooling liquid and injection means making it possible to move the combustion fumes through the bath of cooling liquid, preferably the injection means making it possible to inject the combustion fumes below the surface (S) of the bath of cooling liquid. The combustion system includes a feed device suitable for introducing one or more treatment additives into the coolant for treating pollutants potentially trapped in the coolant. the combustion system comprises at least one sensor for measuring the pH of the coolant or for measuring the concentration of at least one contaminant in the coolant, and a supply device suitable for automatically introducing one or more treatment additives into the coolant depending on the measured pH or the measured concentration. the at least one treatment additive is a base, in particular NaOH, KOH, Ca(OH)2, or an acid, in particular sulfuric acid, or hydrogen peroxide, or a coagulant. - the combustion system includes a decontamination unit, which is located between the condensation unit and a recycling location of the recycled portion of the dehumidified gas, the decontamination unit having the function of removing at least some of the pollutants contained in the dehumidified gas obtained at the outlet of the condensation unit so as to recycle the recycled portion of the dehumidified gas from which at least some of the pollutants have been removed up to the inlet of the oxidizing gas production unit. - the combustion system includes a pollution removal unit, the pollution removal unit being positioned between the combustion device and the condensation unit, the pollution removal unit having the function of removing at least some of the pollutants contained in the combustion fumes before the combustion fumes pass through the condensation unit, such as by introducing the combustion fumes into an inlet of the condensation unit to remove at least some of the pollutants in the combustion fumes. The depollution unit is adapted to capture one or more pollutants selected from particulates, SOx, NOx, acids, heavy metals, ammonia, VOCs. the decontamination unit comprises at least one scrubbing device suitable for contacting the dehumidified gas which is to be decontaminated or the combustion fumes which are to be decontaminated with a scrubbing liquid; The cleaning device comprises a bath of cleaning liquid and injection means making it possible to move the dehumidified gas intended to remove pollutants or the combustion fumes intended to remove pollutants through the bath of cleaning liquid, preferably the injection means making it possible to inject the dehumidified gas intended to remove pollutants or the combustion fumes intended to remove pollutants below the surface of the bath of cleaning liquid. - The combustion system includes a unit for capturing carbon dioxide (CO2) from the non-recycled part of the dehumidified gas.

[0023] The present invention also relates to a method for burning a fuel by means of the above-mentioned combustion system, the combustion unit being supplied with a fuel and an oxidizing gas resulting from a mixture of molecular oxygen (O2) and a recycled portion of the dehumidified gas obtained from the combustion fumes.

[0024] In particular, the combustion system of the present invention may include the following additional optional features, either alone or in combination with each other: - The coolant temperature is regulated automatically. The recycled portion of the dehumidified gas is heated before it is introduced into the oxidizing gas production unit. Calorie is taken from the combustion fumes and the calorie is used to heat a recycled portion of the dehumidified gas before it is introduced into the oxidizing gas production unit. - the recycled portion of the dehumidified gas is heated such that the temperature of the oxidizing gas at the inlet of the combustor is within a predefined temperature range and / or such that the temperature of the oxidizing gas at the inlet of the combustor is above the dew point of the oxidizing gas. The fuel is selected so as to produce, at the outlet of the combustion device, combustion fumes comprising, preferably consisting of, carbon dioxide (CO2), water vapor and optionally molecular oxygen. The fuel is a hydrocarbon, preferably a saturated hydrocarbon of the alkane type (C n H 2n+2 ). The combustion fumes produced at the outlet of the combustion device comprise carbon dioxide (CO2), water vapour, optionally molecular oxygen and one or more pollutants, more preferably one or more pollutants selected from particulates, SOx, NOx, acids, heavy metals, ammonia, VOCs. - The combustion fumes have all or some of their pollutants removed when they pass through the condensing unit. - The combustion fumes have had all or some of their pollutants removed before passing through the condensing unit. The dehumidified gas has had all or some of its contaminants removed before the recycled portion of the dehumidified gas is recycled at the inlet of the oxidizing gas production unit. - Carbon dioxide (CO2) is captured from the non-recycled portion of the dehumidified gas. [Brief description of the drawings]

[0025] The features and advantages of the present invention will become more apparent on reading the following detailed description of some specific alternative embodiments of the invention, which are described by way of non-limiting, non-exhaustive examples of the invention and with reference to the accompanying drawings, in which: [Figure 1] FIG. 1 is a schematic diagram of a first particular alternative embodiment of a combustion device of the present invention. [Diagram 2] FIG. 2 illustrates, in a schematic manner, a particular alternative embodiment of an exchanger that can be used in the condensing unit of the combustion system of FIG. [Diagram 3] FIG. 3 shows, in schematic form, a second particular alternative embodiment of the combustion device of the present invention which implements recycling of a portion of the combustion fumes before condensation. [Figure 4] FIG. 4 is a schematic diagram of a third alternative specific embodiment of a combustion apparatus of the present invention which provides for the removal of pollutants from the combustion fumes as they pass through a condensation unit. [Diagram 5] FIG. 5 is a schematic diagram of a fourth specific alternative embodiment of the combustion apparatus of the present invention, which uses a unit for removing pollutants from the dehumidified gas at the outlet of the condensation unit before the dehumidified gas is recycled to the oxidizing gas production unit. [Figure 6] FIG. 6 is a schematic diagram of a fifth alternative specific embodiment of a combustion apparatus of the present invention, which performs the removal of pollutants from the combustion fumes before they are introduced into a condensation unit. [Figure 7] FIG. 7 shows diagrammatically a particular alternative embodiment of a scrubbing device that can be used in the decontamination unit of the combustion system of FIG. 5 or FIG. [Figure 8] FIG. 8 is a schematic diagram of a sixth specific alternative embodiment of the combustion apparatus of the present invention, which uses a heat exchanger to remove some of the calories in the combustion fumes and uses these calories to heat a recycled portion of the dehumidified gas. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] FIG. 1 shows a schematic representation of a first alternative embodiment of a combustion system of the present invention, comprising: - a combustion device 1 which in operation is supplied with a fuel C by a supply means 2; - a unit 3 for producing an oxidizing gas GC, which in operation makes it possible to supply the combustion device 1 with the oxidizing gas GC; - a condensation unit 4 suitable for condensing the combustion fumes F produced by the combustion device 1; - recycling means 5 making it possible to feed at least one recycled portion GDR of the dehumidified gas GD obtained at the outlet of the condensation unit 4 to the oxidizing gas production unit 3; - a unit 6 for providing molecular oxygen, which supplies the molecular oxygen to the oxidizing gas production unit 3; - Adjustment unit 7.

[0027] The oxidizing gas production unit 3, in operation, makes it possible to produce an oxidizing gas GC resulting from mixing the recycled portion GDR of said dehumidified gas GD obtained at the outlet of the condensation unit 4 with pure molecular oxygen (O2) provided by unit 6.

[0028] The unit 6 for providing molecular oxygen may be of any known type, for example a unit for producing molecular oxygen by cryogenics and / or a unit for producing molecular oxygen by electrolysis of water. The unit 6 for providing molecular oxygen may not be designed to produce molecular oxygen on-site, but may simply comprise means for storing molecular oxygen previously produced elsewhere.

[0029] The combustion device 1 generally allows the oxy-combustion of a fuel C with said oxidizing gas GC in a combustion chamber, the thermal energy resulting from this combustion being able to be used exchangeably according to the invention in any type of application requiring a heat supply, for example but not limited to for heating a fluid in a heating installation (not shown). This combustion device may also be a boiler, a furnace, etc. according to the invention.

[0030] Recycling of the recycled portion GDR of the dehumidified gas GD obtained at the outlet of the condensation unit 4 at the inlet of the production unit 3 makes it possible, in a manner known per se, to better control the oxidative combustion reaction in the combustion device 1 and to significantly reduce the combustion temperature in the combustion device 1, compared to an oxygen combustion reaction carried out exclusively from pure molecular oxygen as oxidant.

[0031] In the context of the present invention, the fuel C may vary widely depending on the application and may be in solid, liquid or gaseous form, as the case may be.

[0032] The combustion reaction of the fuel C with the oxidizing gas GC produces combustion fumes F, the composition of which depends on the fuel used.

[0033] The particular alternative embodiment of FIG. 1 is particularly suitable for operating with a fuel C that produces combustion fumes consisting of carbon dioxide (CO) and water in the form of steam (HO), and optionally molecular oxygen, and that are devoid of pollutants, such as SOx, NOx or acid type pollutants.

[0034] Thus, in a non-limiting, non-exhaustive embodiment, the fuel C used in the combustion system of FIG. 1 can be any type of hydrocarbon, such as a conventional hydrocarbon derived from oil or natural gas, or a specialized hydrocarbon derived from shale gas or oil, bituminous shale or sand, coal gas, biogas, syngas, etc.

[0035] For example, if fuel C is a saturated hydrocarbon of the alkane type (C n H 2n+2 ), the combustion reaction in the device is known: TIFF2024516116000002.tif11166

[0036] The condensation unit 4 is suitable for condensing the combustion fumes F produced by the combustion device 1 by contacting these combustion fumes F with a cooling liquid L so as to produce a dehumidified gas GD having a lower absolute humidity than the combustion fumes F at the inlet of the condensation unit 4.

[0037] The condensation unit 4 may generally comprise any type of exchanger making it possible to bring the combustion fumes into direct contact with a cooling liquid L, the temperature of which is lower than that of the combustion fumes so as to condense at least some of the water contained in the combustion fumes F.

[0038] In a preferred alternative embodiment shown in FIG. 2, this exchanger 40 comprises an enclosure 400 containing a bath 401 of cooling liquid L and injection means 403 suitable for introducing combustion fumes F below the surface S of the bath of cooling liquid L (FIG. 2).

[0039] These injection means 403 may in particular comprise a fan or compressor 403f and a duct 403a comprising, for example in its upper part 403c, an intake opening 403b. The lower part 403d of the injection duct 403a is immersed in the bath 401 of cooling liquid L and comprises a discharge opening 403e immersed in the bath 401 of cooling liquid L.

[0040] In operation, the fan or compressor 403f makes it possible to suck in the combustion fumes F at the outlet of the combustion device 1 and introduce them into the injection duct 403 through the inlet opening 403b. These combustion fumes F escape from the injection duct 403 through the discharge opening 403e and are thus forced into the bath 401 of cooling liquid L below the surface S of the bath 401 of cooling liquid L, rising to the surface S of the liquid bath and escaping from the enclosure 400 through the discharge opening 400a of the enclosure 400 in the form of the above-mentioned dehumidified gas GD.

[0041] Temperature T of coolant L L is always the temperature T of the combustion fume F at the inlet of the exchanger 40 F lower, preferably lower than the dew point of the combustion fumes.

[0042] The absolute humidity of a gas (g water / kg dry air) expresses the number of grams of water vapor present in a given volume of gas per mass of dry gas in that volume expressed in kilograms. Its value remains constant as the temperature of the gas varies, but remains greater than the dew point of the gas.

[0043] It is also noted that the relative humidity of a gas (expressed in %) is the ratio between the partial pressure of water vapour and the saturation pressure of water vapour.

[0044] While passing through the bath 401 of cooling liquid L, the combustion fumes F undergo condensation when in contact with the cooling liquid L, so that the absolute humidity of the dehumidified gas GD at the outlet of the condensing unit 4 becomes less than the absolute humidity of the combustion fumes F at the inlet of the condensing unit 4.

[0045] The difference between the absolute humidity of the dehumidified gas GD and the absolute humidity of the combustion fumes F is especially important when the temperature T F and the low temperature T of the coolant L L The temperature T of the combustion fume F depends on the difference between F and the temperature T of the coolant L L The temperature difference ΔT between F -T L ) is larger, the lower the absolute humidity of the dehumidified gas GD compared to the absolute humidity of the combustion fumes F.

[0046] Upon leaving the bath 401 of cooling liquid L, the relative humidity of the dehumidified gas GD is on the other hand higher and may in certain operating conditions approach or even reach saturation, ie 100% relative humidity.

[0047] In another variation, a fan or compressor 403f is connected to the injection duct 403 and used to introduce the combustion fumes F into the injection duct 403 by flowing the combustion fumes F through the intake opening 403b of the injection duct 403.

[0048] In another alternative embodiment, the condensing unit 4 may include multiple exchangers 40 mounted one after the other.

[0049] The invention is not limited to the use of an exchanger 40 of the type shown in Figure 2. In other alternative embodiments, the exchanger 40 for condensation of the combustion fumes F can be, for example, of the type described in International Patent Application WO2016 / 071648 or International Patent Application WO2020 / 030419, or it can be an exchanger that operates by injecting a cooling liquid L so that it comes into contact with the combustion fumes F.

[0050] Regardless of the type of exchanger used for condensation of the combustion fumes by contacting them with the cooling liquid L, the conditioning unit 7 regulates the temperature T L Suitable for automatically adjusting

[0051] With particular reference to FIG. 1, to provide automatic regulation of the temperature of the coolant L, the combustion system preferably includes at least one of the following humidity sensors: - a sensor C1 delivering a measurement signal S1 measuring the humidity (absolute or relative) in the recycled portion GDR of the dehumidified gas; a sensor C2 delivering a measurement signal S2 measuring the humidity (absolute or relative) in the combustion gas GC introduced into the combustion device 1; a sensor C3 delivering a measurement signal S3 measuring the humidity (absolute or relative) in the combustion fumes at the outlet of the combustion device 1;

[0052] In this alternative embodiment, the conditioning unit 7 generally determines the temperature T of the cooling liquid L of the condensing unit 4 based on the (absolute or relative) humidity measured by at least one of the sensors C1, C2 or C3. L is designed to automatically adjust

[0053] In one variant, the regulating unit 7 determines the temperature T of the cooling liquid L of the condensing unit 4 based only on the (absolute or relative) humidity measured by one of the sensors C1, C2, C3. L is designed to automatically adjust

[0054] In another variant, the regulating unit 7 determines the temperature T of the cooling liquid L of the condensing unit 4 based on the respective (absolute or relative) humidity measured by at least two of the sensors C1, C2, C3. L is designed to automatically adjust

[0055] In another variant, the regulating unit 7 regulates the temperature T of the cooling liquid L of the condensing unit 4 based on the (absolute or relative) humidity measured by the three sensors C1, C2, C3. L is designed to automatically adjust

[0056] This automatic regulation of the temperature of the cooling liquid L by the regulating unit 7 makes it possible to control and automatically regulate the absolute humidity in the recycled portion GDR of the dehumidified gas GD at the inlet of the unit 3 to produce the oxidizing gas GC. L By increasing the temperature T of the cooling liquid L, the absolute humidity is increased in the recycled portion GDR of the dehumidified gas GD. L By lowering the absolute humidity, the absolute humidity is reduced in the recycled portion GDR of the dehumidified gas GD.

[0057] The sensor C1 is used to measure the temperature T of the coolant L. L The automatic adjustment of the humidity (absolute or relative) TH of the recycled portion GDR of the dehumidified gas GD at the inlet of the unit 3 for producing the oxidizing gas GC is performed by adjusting the humidity (absolute or relative) TH of the recycled portion GDR of the dehumidified gas GD at the inlet of the unit 3 for producing the oxidizing gas GC within a predefined and compatible operating range (TH min ;TH max )(TH min <TH<TH max ) This operating range is defined on a case-by-case basis according to the characteristics of the combustion device 1.

[0058] The sensor C2 is used to measure the temperature T of the coolant L. L The automatic adjustment of the humidity (absolute or relative) TH of the oxidizing gas GC at the inlet of the combustion device 1 can be performed by adjusting the humidity TH within a predefined operating range (TH min ;TH max)(TH min <TH<TH max ) which is defined on a case-by-case basis according to the operating characteristics of the combustion device 1.

[0059] The sensor C3 is used to measure the temperature T of the coolant L. L The automatic adjustment of the humidity (absolute or relative) TH of the combustion fumes F at the outlet of the combustion device 1 is performed, for example, by adjusting the humidity TH within a predefined operating range (TH min ;TH max )(TH min <TH<TH max ) which is defined on a case-by-case basis according to the operating characteristics of the combustion device 1.

[0060] In particular, the humidity (absolute or relative) TH of the recycled portion GDR of the dehumidified gas GD at the inlet of the unit 3 for producing the oxidizing gas GC has a significant influence on the characteristics of the oxidizing gas GC produced by the production unit 3, in particular on the humidity (absolute or relative) of the oxidizing gas GC and the dew point of the oxidizing gas GC.

[0061] Temperature T of coolant L L The automatic adjustment of is preferably performed to maintain the (absolute or relative) humidity of the oxidizing gas GC within an operating range compatible with the combustion device 1, which operating range can be provided by the manufacturer of the combustion device 1 or can be determined by the user of the combustion device 1.

[0062] In particular, the above-mentioned operating range (TH min ;TH max ) will be defined on a case-by-case basis to obtain the above-mentioned stability of the (absolute or relative) humidity of the oxidizing gas GC.

[0063] With reference to FIG. 1, the combustion device further comprises heating means 8 advantageously making it possible to heat the recycled portion GDR of the dehumidified gas GD, which, in operation, makes it possible to increase the temperature of the recycled portion GDR of the dehumidified gas GD before it is introduced into the unit 3 for generating the oxidizing gas GC.

[0064] The heating means 8 can be a heating device 8A supplied by an energy source such as an electric heater.

[0065] This increase in the temperature of the recycled portion GDR of the dehumidified gas GD has the purpose of moving the temperature of the recycled portion GDR of the dehumidified gas GD away from its dew point before it is introduced into the unit 3 for producing the oxidizing gas GC, in particular to reduce, and preferably avoid, the risk of condensation of the oxidizing gas GC in the combustion device 1 and to limit the formation of harmful rust on the walls of the combustion device 1 over time.

[0066] In particular, it is up to the person skilled in the art to specify on a case-by-case basis the required temperature increase for the recycled portion GDR of the dehumidified gas GD, for example so that the temperature of the oxidizing gas GC at the inlet of the combustion device 1 is within a predefined temperature range, in particular within the range recommended for the combustion device 1, and / or so that the temperature of the oxidizing gas GC at the inlet of the combustion device 1 is above the dew point of the oxidizing gas GC.

[0067] This heating means 8 is particularly useful when the relative humidity of the recycled portion GDR of the dehumidified gas GD is high, and in fact is even more useful when the condensation unit 4 uses an apparatus of the type shown in FIG. 2.

[0068] 2 shows, as a non-limiting example of the invention, a particular alternative embodiment of the regulating unit 7. In this particular alternative embodiment, the regulating unit 7 comprises a cooling device 70 making it possible to modify the temperature of the cooling liquid L of the exchanger 40, at least one temperature sensor C4 delivering a measurement signal S4 measuring the temperature of the cooling liquid L in the bath 401 of the enclosure 400 of the exchanger 40, and an electronic processing unit 71 suitable for automatically controlling the cooling device 70 from the temperature measurement signal S4 and from at least one of the humidity measurement signals S1, S2, S3.

[0069] The electronic processing unit 71 can be a programmable electronic processing unit, for example of the programmable automatic type, which is programmed to carry out an automatic regulation of the temperature of the cooling liquid L.

[0070] In particular, the electronic processing unit 71 calculates a predefined function f[T set =f(S1) or T set =f(S2) or T set =f(S3) or T set = F(S1;S2) or T set =f(S1;S3) or T set =f(S2;S3) or T set =f(S1;S2;S3)] to at least one of the humidity measurement signals S1, S2, S3 to at least one variable set temperature T set When the combustion system is in stable operation (steady state), the temperature measured by the signal S4 is equal to the set temperature T set The cooling device 70 may be designed and specifically programmed to automatically control the cooling device 70 so that the temperature at which the cooling device 70 is cooled is substantially equal to

[0071] The electronic processing unit 71 also determines a set temperature range (T min ;T max ) is automatically calculated, and when the combustion system is in stable operation (steady state), the temperature measured by the signal S4 is within the set temperature range (T min ;T maxThe cooling device 70 may be designed and specifically programmed to automatically control the cooling device 70 so that the internal temperature is maintained within 40° C.).

[0072] In particular, in a limited manner, and in particular in the particular alternative embodiment of Fig. 2, the cooling device 70 comprises an exchanger 701, for example of the plate exchanger type, comprising a first loop 701a in which a cooling liquid L can be circulated in a closed manner by means of a pump 701b, and a second loop 701c in which a heat transfer fluid can be circulated in a closed manner by means of a pump 701d, the second loop 701c further being provided with means 702 for cooling the heat transfer fluid. The heat transfer fluid circulating in this second loop 701c makes it possible to cool the cooling liquid L circulating in the first loop by non-contact heat exchange between the two liquids.

[0073] In operation, the bath 401 of cooling liquid L receives calories from the combustion fumes F during their passage through the bath 401, which contribute to raising the temperature of the bath 401d of liquid L. The electronic processing unit 71 determines whether the cooling liquid L is sufficiently cooled to reach a set temperature T, measured by the signal S4. set or the temperature measured on signal S4 is maintained at a value substantially equal to the set temperature range (T min ;T max ) to maintain the set temperature T set Or the above set temperature range (T min ;T max ), and the temperature measured in the liquid bath L (signal S4), by means of control signals SC1 and SC2, respectively, pumps 701b and 701d are automatically controlled individually.

[0074] In a simpler alternative embodiment, the set temperature T set or set temperature range (T min ;T max ) can be predefined case by case by adaptation to the combustion device and entered as a parameter in the adjustment unit 7. In this case, the humidity sensors C1, C2 and C3 are not necessary.

[0075] 1, the non-recycled portion GDNR of the dehumidified gas GD is treated by at least one CO2 capture unit 10, which in a manner known per se makes it possible to capture CO2 by removing all of the molecular oxygen and water contained in the non-recycled portion GDNR of the dehumidified gas GD. The captured molecular oxygen can also be injected into the unit 3 for generating the oxidizing gas GC, in order to reduce the consumption of molecular oxygen supplied by the unit 6.

[0076] When the non-recycled portion GDNR of the dehumidified gas GD is free of pollutants, the CO2 capture operation is easier compared to CO2 capture in gases containing pollutants such as SOx, NOx, acids, etc.

[0077] FIG. 3 shows a second variant of the combustion system which differs from that of FIG. 1 in that the device comprises recycling means 5′ upstream of the condensation unit 4 making it possible to recycle the portion FR of the combustion fumes F at the inlet of the unit 3 for producing an oxidizing gas GC, i.e. the portion FR of the combustion fumes F which has not been dehumidified in the condensation unit 4.

[0078] 4 shows a third variant of a combustion system, which is not only used for operating with a fuel C producing combustion fumes F consisting only of carbon dioxide (CO2) and water (H2O), and optionally molecular oxygen, but is also suitable for operating with a fuel C producing combustion fumes F containing more or less carbon dioxide (CO2), water (H2O), optionally molecular oxygen, and various pollutants such as, for example but not limited to, SOx (sulfur oxides) and / or NOx (nitrogen oxides) and / or HCl (hydrogen chloride) and / or HF (hydrogen fluoride) type acids, and / or ammonia and / or particulates and / or heavy metals. This fuel C is obtained, for example, from biomass or solid recovered fuels.

[0079] The presence of these pollutants in combustion fumes F complicates the capture of CO2 compared to combustion fumes consisting only of carbon dioxide (CO2) and water (H2O).

[0080] Referring to FIG. 4, the combustion system differs from that of FIG. 1 in that it further comprises a supply device 9 including a tank 90 containing at least one process additive or a mixture of several different process additives and connected via a supply pump 91 or equivalent to a condensing unit 4 controlled by a regulating unit 7, e.g. by the above-mentioned electronic processing unit 71, with a control signal SC3.

[0081] This device 9 makes it possible, in operation, to add one or more process additives to the cooling liquid L of the condensing unit 4 in a manner controlled by the regulating unit 7 .

[0082] The treatment additives can be in various forms, in particular in the form of liquids, dry powders or solutions, and are adapted to the type of pollutants potentially contained in the combustion fumes F.

[0083] The treatment additive is selected so that it is capable of contacting and reacting with at least one type of contaminant contained in the cooling liquid L of the condensing unit 4 to neutralize said contaminants.

[0084] As a non-limiting, non-exhaustive example, when the combustion fumes F potentially contain acid contaminants such as SOx (sulfur oxides), HCl (hydrogen chloride) and / or HF (hydrogen fluoride) type acids, the treatment additive may in particular be a base such as NaOH, KOH, or calcium hydroxide Ca(OH)2.

[0085] When the combustion fumes F potentially contain NOx (nitrides and oxides) pollutants, the treatment additive may in particular be a base such as NaOH, KOH, or calcium hydroxide Ca(OH)2 or hydrogen peroxide (H2O2).

[0086] When the combustion fumes F potentially contain contaminants such as ammonia which in solution produces a solution with a basic pH, such as aqueous ammonia (NH4OH), the treatment additive may also be an acid, for example sulfuric acid (H2SO4).

[0087] When the combustion fumes F potentially contain VOCs (volatile organic compounds), the treatment additive may be a flocculating agent.

[0088] Preferably, the combustion system includes at least one sensor (C5) (FIG. 4) that delivers a measurement signal S5 that measures the pH of the coolant L or the concentration of at least one type of pollutant in the coolant L.

[0089] The regulating unit 7 is designed to automatically control the pump 91 by means of a control signal SC3 to automatically regulate the addition of the treatment additive into the coolant L in dependence on the pH or the concentration of the treatment additive measured by the sensor C5, e.g. so that the pH of the coolant L is closest to 7 or so that the concentration of the treatment additive in the coolant L is as low as possible, in particular below a predefined maximum threshold value.

[0090] In operation, when the combustion fumes F contain more or less various pollutants, such as, for example, but not limited to, SOx (sulfur oxides) and / or NOx (nitride oxides), and / or acids of the HCl (hydrogen chloride) and / or HF (hydrogen fluoride) type, and / or ammonia and / or particulates and / or heavy metals during the time of contact with the cooling liquid L in the condensing unit 4, in particular when they pass through the bath 401 of the cooling liquid L of the condensing unit 4 shown in Fig. 2, the pollutants are advantageously captured and, if appropriate, neutralized in the cooling liquid L, which makes it possible to obtain a dehumidified gas (GD) at the outlet of the condensing unit 4 sufficiently freed of at least some of its pollutants. This avoids recycling an excessively large amount of pollutants at the inlet of the unit 3 for generating the oxidizing gas GC.

[0091] In another variant, it is also possible to use several feed devices 9 containing different processing additives and controlled in parallel by the regulating unit 7 .

[0092] Figure 5 shows a fourth variant of the combustion system, which differs from the one in Figure 1 in that it further comprises a decontamination unit 9A, which in this alternative embodiment is located between the condensation unit 4 and the recycling location of the recycled portion GDR of the dehumidified gas GD.

[0093] The function of this decontamination unit 9A is to remove at least some, preferably a sufficient amount, of the pollutants contained in the dehumidified gas GD obtained at the outlet of the condensation unit 4, so as to recycle a recycled portion GDR of the dehumidified gas, which has at least some of the pollutants removed, preferably a sufficient amount of the pollutants removed, and which consists mainly of CO2, H2O in the form of water vapor and optionally molecular oxygen, to the inlet of the oxidizing gas production unit 3.

[0094] Figure 6 shows a fifth variant of the combustion system, which differs from that of Figure 1 in that it further comprises a decontamination unit 9B, which in this alternative embodiment is located between the combustion device 1 and the condensation unit 4. The function of this decontamination unit 9B is to remove at least some, preferably all, of the pollutants contained in the combustion fumes F before passing them to the condensation unit 4, so as to remove at least some of the pollutants, preferably a sufficient amount of the pollutants, and to introduce at the inlet of the condensation unit 4 the combustion fumes F' consisting mainly of CO2, H2O in the form of water vapor and, optionally, molecular oxygen.

[0095] FIG. 7 shows a particular embodiment of the decontamination unit 9A (or 9B).

[0096] In this particular embodiment, the decontamination unit 9A or 9B includes a scrubbing device 90, which may generally consist of any type of exchanger making it possible to contact by any means the dehumidified gas GD from which the pollutants are to be removed with the scrubbing liquid or the combustion fumes from which the pollutants are to be removed with the scrubbing liquid so as to capture at least some of the pollutants contained in the dehumidified gas GD or the combustion fumes F in the scrubbing liquid.

[0097] In a preferred alternative embodiment shown in FIG. 7, this cleaning device 9A (or 9B) is preferably of the type comprising an enclosure 900 containing a bath 901 of cleaning liquid 902 and injection means 903 suitable for introducing combustion fumes F resulting in the removal of pollutants or dehumidified gas GD resulting in the removal of pollutants below the surface S of the bath 901 of cleaning liquid 902.

[0098] These injection means 903 may in particular comprise a fan or compressor 903f and a duct 903a comprising, for example in its upper part 903c, an intake opening 903b. The lower part 903d of the injection duct 903a is immersed in the bath 901 of cleaning liquid 902 and comprises a discharge opening 903e immersed in the bath 901 of cleaning liquid 902.

[0099] In operation, the fan or compressor 403f makes it possible to suck and introduce, via the intake opening 903b, the combustion fumes F to be decontaminated at the outlet of the combustion device 1 or the dehumidified gas GD to be decontaminated at the outlet of the condensation unit 4 into the injection duct 903. The dehumidified gas GD (or the combustion fumes F) to be decontaminated escapes from the injection duct 903 via the discharge opening 903e and is thus forced into the bath 901 of cleaning liquid 902 below the surface S of the bath 901 of cleaning liquid 902, rises to the surface S of the liquid bath and escapes from the enclosure 900 via the discharge opening 900a of the enclosure 900 in the form of decontaminated dehumidified gas GD (or decontaminated combustion fumes F).

[0100] In another variant, a fan or compressor 903f can be connected to the injection duct 903 and used to introduce the dehumidified gas GD to be decontaminated or the combustion fumes F to be decontaminated by flowing it through the suction opening 903b of the injection duct 903.

[0101] As the contaminants pass through the cleaning device 90 , they are captured in a bath 901 of cleaning liquid 902 .

[0102] The bath 901 of cleaning liquid 902 may be the same during the entire process or may be automatically renewed with uncontaminated cleaning liquid during the process to keep the concentration of contaminants trapped in the bath 901 of cleaning liquid 902 low.

[0103] The cleaning fluid 902 may be water or an aqueous solution.

[0104] The cleaning fluid 902 may also include one or more processing additives and may include at least one device for supplying the processing additives as previously described for the FIG. 4 variation.

[0105] In another alternative embodiment, the decontamination unit 9A (or 9B) may include multiple cleaning apparatuses 9A (or 9B) mounted alongside one another.

[0106] In another alternative embodiment, the decontamination unit 9A (or 9B) may be designed to perform a dry decontamination process.

[0107] Figure 8 shows an alternative embodiment of a combustion device which differs from that of figure 1 in that the heating means 8 comprise a heat exchanger 8B of the gas / gas exchanger type comprising an enthalpy loop 80 in which a heat transfer fluid circulates. This heat exchanger 8B makes it possible to take at least some of the calories from the combustion fumes F and transfer them to the recycled portion GDR of the dehumidified gas GD in order to obtain the desired temperature increase for the recycled portion GDR of the dehumidified gas GD before it is introduced into the unit 3 for producing the oxidizing gas GC.

[0108] This heating means 8 including a heat exchanger 8B can also be used in addition to or instead of the heating means 8 described above for the variants of FIGS.

[0109] However, in the context of the present invention, the heating means 8 of Figures 1, 3, 4, 5, 6 and 8 can be optional and the combustion device potentially does not include them.

[0110] In another variant of the invention, the combustion device may also include such heating means 8 and have no automatic regulation of the temperature of the cooling liquid L.

[0111] However, preferably the combustion device comprises both a conditioning unit 7 and a heating means 8 .

Claims

1. A combustion system comprising a unit (3) for producing an oxidizing gas (GC), a combustion device (1) enabling the combustion of a fuel (C) by means of said oxidizing gas (GC), a condensation unit (4) suitable for condensing the combustion fumes (F; F') produced by the combustion device (1) by contacting the combustion fumes (F; F') with at least one cooling liquid (L) to produce a dehumidified gas (GD), recycling means (5) for supplying at least one recycled portion (GDR) of the dehumidified gas at the outlet of the condensation unit (4) to the oxidizing gas production unit (3), and a unit (6) for providing molecular oxygen and supplying the molecular oxygen to the oxidizing gas production unit (3), wherein the oxidizing gas production unit (3) supplies the oxidizing gas (GC) resulting from the mixing of molecular oxygen with the recycled portion (GDR) of said dehumidified gas (GD) to the combustion device (1), and the combustion system further comprises a temperature (T Ｌ ), and the combustion system further has the following technical features (a) and / or (b): (a) the combustion system comprises at least one sensor (C1) for measuring the absolute humidity or the relative humidity in the recycled portion of the dehumidified gas (GDR), and / or at least one sensor (C2) for measuring the absolute humidity or the relative humidity in the oxidizing gas (GC), and / or at least one sensor (C3) for measuring the absolute humidity or the relative humidity in the combustion fumes, and the adjusting unit (7) adjusts the temperature (T) of the cooling liquid (L) of the condensing unit (4) based on the absolute humidity or the relative humidity measured by said sensor (C1) at least in the recycled portion of the dehumidified gas (GDR), and / or based on the absolute humidity or the relative humidity measured in the oxidizing gas (GC) by at least said sensor (C2), and / or based on the absolute humidity or the relative humidity measured in the combustion fumes by at least said sensor (C3); Ｌ ) and / or (b) the combustion device (1) is characterized by an operating range defining a maximum absolute or relative humidity and a minimum absolute or relative humidity, and the regulating unit (7) adjusts the temperature (T Ｌ ) automatically adjusts the

2. 2. The combustion system according to claim 1, wherein the combustion system comprises means (8) for heating the recycled part (GDR) of the dehumidified gas (GD).

3. The adjustment unit (7) adjusts the absolute or relative humidity (TH) of the recycled portion (GDR) of the dehumidified gas (GD) within a predefined operating range (TH ｍｉｎ ; T.H. ｍａｘ ) to maintain the temperature (T Ｌ 3. The combustion system according to claim 1, further comprising a function for automatically adjusting the temperature of the combustion chamber.

4. The adjustment unit (7) adjusts the absolute or relative humidity (TH) of the oxidizing gas (GC) within a predefined operating range (TH ｍｉｎ ; T.H. ｍａｘ ) to maintain the temperature (T Ｌ 2. The combustion system of claim 1, further comprising a function for automatically adjusting the temperature of the combustion chamber.

5. The adjustment unit (7) adjusts the absolute or relative humidity (TH) of the combustion fumes within a predefined operating range (TH ｍｉｎ ; T.H. ｍａｘ ) to maintain the temperature (T Ｌ 2. The combustion system of claim 1, further comprising a function for automatically adjusting the temperature of the combustion chamber.

6. The adjustment unit (7) adjusts the temperature (T Ｌ The temperature (T) of the cooling liquid (L) of the condensing unit (4) is controlled so as to maintain the cooling liquid (L) at a predefined temperature or within a predefined temperature range. Ｌ 2. The combustion system of claim 1, further comprising a function for automatically adjusting the temperature of the combustion chamber.

7. 2. Combustion system according to claim 1, characterized in that the heating means (8 / 8B) are suitable for heating the recycled part (GDR) of the dehumidified gas (GD) by means of calories extracted from the combustion fumes.

8. 2. The combustion system according to claim 1, comprising heating means (8) suitable for heating the recycled portion (GDR) of the dehumidified gas (GD) so that the temperature of the oxidizing gas (GC) at the inlet of the combustion device (1) is within a predefined temperature range and / or so that the temperature of the oxidizing gas (GC) at the inlet of the combustion device (1) is above the dew point of the oxidizing gas (GC).

9. 2. A combustion system according to claim 1, wherein the condensation unit (4) comprises at least one condenser (40) containing a bath (401) of cooling liquid (L) and injection means (403) making it possible to move the combustion fumes (F; F') through the bath (401) of cooling liquid (L), preferably the injection means (403) making it possible to inject the combustion fumes (F; F') below the surface (S) of this bath (401) of cooling liquid (L).

10. 2. The combustion system according to claim 1, further comprising a supply device (9) suitable for introducing one or more treatment additives into the cooling liquid (L) for treating pollutants potentially trapped in the cooling liquid (L).

11. 2. The combustion system according to claim 1, further comprising at least one sensor (C5) for measuring the pH of the coolant (L) or for measuring the concentration of at least one pollutant in the coolant (L), and a supply device (9) suitable for automatically introducing one or more treatment additives into the coolant (L) depending on the measured pH or the measured concentration.

12. The at least one processing additive is a base, particularly NaOH, KOH, Ca(OH) ２ or an acid, in particular sulfuric acid, or hydrogen peroxide, or a coalescing agent.

13. 2. The combustion system according to claim 1, further comprising a pollution removal unit (9A) located between the condensation unit (4) and a recycling location of the recycled portion (GDR) of the dehumidified gas, the pollution removal unit (9A) having the function of removing at least some of the pollutants contained in the dehumidified gas (GD) obtained at the outlet of the condensation unit (4) so ​​as to recycle the recycled portion (GDR) of the dehumidified gas from which at least some of the pollutants have been removed to the inlet of the oxidizing gas production unit (3).

14. 2. The combustion system according to claim 1, further comprising a pollution removal unit (9B) located between the combustion device (1) and the condensation unit (4), the pollution removal unit (9B) having a function of removing at least some of the pollutants contained in the combustion fumes (F') before the combustion fumes (F') pass through the condensation unit (4) by introducing the combustion fumes (F') into an inlet of the condensation unit (4) to remove at least some of the pollutants of the combustion fumes (F').

15. Combustion system according to claim 13 or 14, wherein the pollution removal unit (9A; 9B) is suitable for capturing one or more pollutants selected from particulates, SOx, NOx, acids, heavy metals, ammonia, VOCs.

16. 15. A combustion system according to claim 13 or 14, wherein the decontamination unit (9A; 9B) comprises at least one scrubbing device (90) suitable for contacting the dehumidified gas (GD) intended to remove pollutants or the combustion fumes (F) intended to remove pollutants with a scrubbing liquid (902).

17. 17. The combustion system according to claim 16, wherein the cleaning device comprises a bath (901) of cleaning liquid (902) and injection means enabling the dehumidified gas (GD) intended to remove pollutants or the combustion fumes (F) intended to remove pollutants to be moved through the bath (901) of cleaning liquid (902), preferably the injection means enabling the dehumidified gas (GD) intended to remove pollutants or the combustion fumes (F) intended to remove pollutants to be injected below the surface of the bath of cleaning liquid.

18. The combustion system converts the non-recycled portion (GDNR) of the dehumidified gas (GD) into carbon dioxide (CO ２ 2. The combustion system of claim 1, further comprising a unit (10) for capturing the oxidized gas.

19. 2. A method for burning a fuel (C) by means of a combustion system according to claim 1, comprising the steps of: a combustion unit (1) burning a fuel (C) and molecular oxygen (O ２ ) and a recycled portion (GDR) of the dehumidified gas obtained from combustion fumes (F; F').

20. 20. The method according to claim 19, wherein the temperature of the cooling liquid (L) is automatically regulated.

21. 21. The method according to claim 19 or 20, wherein the recycled part (GDR) of the dehumidified gas is heated before it is introduced into the unit (3) for producing an oxidizing gas (GC).

22. 22. The method according to claim 21, wherein calories are taken from the combustion fumes and the calories are used to heat the recycled part (GDR) of the dehumidified gas (GD) before it is introduced into the unit (3) for producing the oxidizing gas (GC).

23. 22. The method according to claim 21, wherein the recycled portion (GDR) of the dehumidified gas (GD) is heated such that the temperature of the oxidizing gas (GC) at the inlet of the combustion device (1) is within a predefined temperature range and / or such that the temperature of the oxidizing gas (GC) at the inlet of the combustion device (1) is above the dew point of the oxidizing gas (GC).

24. The fuel (C) is converted into carbon dioxide (CO ２ 21. The method according to claim 19 or 20, wherein the method is selected to produce combustion fumes (F) comprising, preferably consisting of, water vapor and optionally molecular oxygen.

25. The fuel (C) is a hydrocarbon, preferably a saturated hydrocarbon of the alkane type (C ｎ H ２ｎ＋２ 25. The method of claim 24, wherein

26. The combustion fumes (F) produced at the outlet of the combustion device (1) are converted into carbon dioxide (CO ２ 21. The method according to claim 19 or 20, comprising the step of: a) removing the gas from the exhaust gas; b) removing the gas from the exhaust gas; c) removing the gas from the exhaust gas; d) removing the gas from the exhaust gas; d) removing the gas from the exhaust gas;

27. 27. The method according to claim 26, wherein the combustion fumes have had all or some of their pollutants removed when passing through the condensation unit (4).

28. 27. The method according to claim 26, wherein the combustion fumes have been cleaned of all or some of their pollutants before passing through the condensation unit (4).

29. 27. The method according to claim 26, wherein the dehumidified gas (GD) has had all or some of its contaminants removed before the recycled portion (GDR) of the dehumidified gas (GD) is recycled at the inlet of the oxidizing gas production unit (3).

30. Carbon Dioxide (CO ２ 21. The method according to claim 19 or 20, wherein the non-recycled portion (GDNR) of the dehumidified gas (GD) is captured.

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