A combustion system that uses a mixture of molecular oxygen and dehumidified gas obtained from combustion fumes as an oxidizing agent.

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 fuel combustion using an oxidizer from a mixture of molecular oxygen (O2) and a dehumidified gas obtained from combustion fumes. [Background technology]

[0002] Conventional combustion involves mixing fuel with air (oxidizer) in a combustion device (furnace, boiler, etc.) under high-temperature conditions to create oxidation. The reaction is exothermic and naturally sustained. 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, combustion fumes consist mainly of molecular nitrogen (N2), water vapor (H2O), and carbon dioxide (CO2). If it is desirable 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 nitrogen and carbon dioxide. Furthermore, in conventional combustion, depending on the type of fuel used, combustion fumes also contain to a greater or lesser amount of other polluting gases, such as SOx (sulfur oxides), NOx (nitrogen oxides), HCl (hydrogen chloride), and HF (hydrogen fluoride). Consequently, if it is desirable to capture CO2 from these fumes, it is also necessary to separate CO2 from these other pollutants.

[0004] Several solutions have been proposed to capture CO2 from fumes produced by conventional combustion, but their costs remain extremely high.

[0005] To reduce the release of pollutants in combustion fumes, it is known that the conventional combustion described above can be replaced with combustion referred to as "oxycombustion." In oxycombustion, air (oxidizer) is replaced by pure molecular oxygen in stoichiometric proportions, and the number of oxygen atoms is equal to the number required to oxidize all the atoms of the fuel.

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

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

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

[0009] This means that 891 kJ of energy is generated externally per mole of CH4.

[0010] For other fuels, the reaction is similar in appearance to other compounds if the fuel contains atoms other than carbon and hydrogen.

[0011] For example, in the case of the oxy-combustion of methane, it is significantly easier to capture CO2. For this purpose, it is sufficient to condense the water in the fumes by a cooling or drying process to obtain CO2 in the gaseous state.

[0012] Therefore, it is currently known to use a condenser for condensing oxy-combustion fumes in order to facilitate the capture of CO2.

[0013] However, a significant difficulty in oxy-combustion lies in the difficulty of controlling the combustion. This is because, unlike conventional combustion, the oxy-combustion temperature becomes extremely high rapidly and uncontrollably in the combustion chamber, and can become so high that conventional combustion devices cannot withstand it.

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

[0015] This improvement reduces pollutant emissions compared to conventional combustion and facilitates CO2 capture, while enabling more easily controlled molecular oxygen-based combustion compared to oxygen combustion, which uses only pure molecular oxygen as an oxidizer.

[0016] Solutions that recycle a portion of combustion fumes inevitably introduce a moist, oxidizing gas into the combustion apparatus if the fumes always contain water vapor (H2O). If the water content is too high and / or uncontrolled, it is detrimental to the reliability and proper functioning of the combustion apparatus and can cause dangerous corrosion over time.

[0017] Furthermore, when the fuel used generates combustion fumes containing contaminants such as SOx (sulfur oxides), NOx (nitrogen oxides), HCl (hydrogen chloride), and HF (hydrogen fluoride), recycling a portion of the combustion fumes would lead to a harmful increase in the concentration of contaminants in the fumes over time and is therefore not an option. Thus, the aforementioned solution of recycling a portion of the combustion fumes is actually only considered for combustion fumes consisting only of carbon dioxide and water, and free of contaminants, such as those obtained by the combustion of saturated hydrocarbons of the alkane type (methane, propane, etc.) with molecular oxygen. [Overview of the project] [Problems that the invention aims to solve]

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

[0019] The subject of the present invention is a combustion system comprising a unit for producing an oxidizing gas, a combustion apparatus that enables the combustion of a fuel by the oxidizing gas, a condensing unit suitable for condensing combustion fumes produced by the combustion apparatus by producing a dehumidified gas (i.e., a gas having a lower absolute humidity than the combustion fumes at the inlet of the condensing unit) by bringing the combustion fumes into contact with at least one type of coolant, a recycling means that enables supplying at least one recycled portion of the dehumidified gas at the outlet of the condensing unit to the oxidizing gas production unit, and a unit for supplying molecular oxygen that enables supplying molecular oxygen to the oxidizing gas production unit. The oxidizing gas production unit enables supplying the combustion apparatus with an oxidizing gas resulting from a mixture of molecular oxygen and the recycled portion of the dehumidified gas. The combustion system also includes a regulating unit which has the function of automatically regulating the temperature of the coolant in the condensing unit.

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

[0021] Automatic temperature control of the condensing unit's coolant allows for control of the absolute humidity in the recycled portion of the dehumidified gas before it is introduced into the oxidizing gas production unit. Heating the recycled portion of the dehumidified gas raises its temperature before it is introduced into the oxidizing gas production unit, and advantageously allows the temperature of the recycled portion of the dehumidified gas to move away from its dew point.

[0022] In particular, the combustion system of the present invention may include the following additional optional features, either individually or in combination with each other: - The adjustment unit has a function to automatically adjust the temperature of the condensing unit's coolant so that the absolute humidity or relative humidity of the recycled portion of the dehumidified gas is maintained within a predetermined operating range. - The adjustment unit has a function to automatically adjust the temperature of the condensing unit's coolant so that the absolute humidity or relative humidity of the oxidizing gas is maintained within a predetermined operating range. - The adjustment unit has the function of automatically adjusting the temperature of the condensing unit's coolant to maintain the absolute or relative humidity of the combustion fumes within a predetermined operating range. - The adjustment unit has the function of automatically adjusting the temperature of the coolant in the condensing unit to maintain the temperature of the coolant in the condensing unit at a predetermined temperature or within a predetermined temperature range. - The combustion system preferably includes heating means suitable for heating the recycled portion of the dehumidified gas by the calories derived from the combustion fumes. - The heating means is suitable for heating the recycled portion (GDR) of the dehumidified gas such that the temperature of the oxidizing gas at the inlet of the combustion device is within a predetermined temperature range, and / or the temperature of the oxidizing gas at the inlet of the combustion device is above the dew point of the oxidizing gas. - The condensing unit includes at least one condensing device which includes a bath of coolant and an injection means that enables the movement of combustion fumes through the bath of coolant, preferably the injection means which enables the injection of combustion fumes below the surface (S) of the bath of coolant. - The combustion system includes a supply device suitable for introducing one or more treatment additives into the coolant to treat contaminants potentially trapped in the coolant. - The combustion system includes at least one sensor for measuring the pH of the coolant or the concentration of at least one type of 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 measured concentration. - The at least one treatment additive is a base, particularly NaOH, KOH, or Ca(OH)2, or an acid, particularly sulfuric acid, or hydrogen peroxide, or a flocculant. - The combustion system includes a decontamination unit, which is located between the condensation unit and the recycling location for the recycled portion of the dehumidified gas, and the decontamination unit has the function of removing at least some of the contaminants contained in the dehumidified gas obtained at the outlet of the condensation unit so as to recycle the recycled portion of the dehumidified gas, with at least some of the contaminants removed, up to the inlet of the oxidizing gas production unit. - The combustion system includes a decontamination unit, which is located between the combustion apparatus and the condensation unit, and the decontamination unit has the function of removing at least some of the contaminants contained in the combustion fumes before the combustion fumes pass through the condensation unit, so as to introduce the combustion fumes into the inlet of the condensation unit and remove at least some of the contaminants in the combustion fumes. - The decontamination unit is suitable for capturing one or more contaminants selected from particulate matter, SOx, NOx, acids, heavy metals, ammonia, and VOCs. - The decontamination unit includes at least one cleaning device suitable for bringing dehumidified gas or combustion fumes, from which contaminants will be removed, into contact with a cleaning solution. - The cleaning apparatus includes a bath of cleaning solution and an injection means that allows dehumidified gas or combustion fumes that will remove contaminants to be moved through the bath of cleaning solution, preferably the injection means that allows dehumidified gas or combustion fumes that will remove contaminants to be injected below the surface of the bath of cleaning solution. - The combustion system includes a unit for capturing carbon dioxide (CO2) from the unrecycled portion of the dehumidified gas.

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

[0024] In particular, the combustion system of the present invention may include the following additional optional features, either individually or in combination with each other: - The coolant temperature is automatically adjusted. - The recycled portion of the dehumidified gas is heated before it is introduced into the oxidizing gas production unit. - Calories are taken from combustion fumes, and calories are used to heat the 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 combustion device is within a predetermined temperature range, and / or the temperature of the oxidizing gas at the inlet of the combustion device is above the dew point of the oxidizing gas. - The fuel is selected to produce a combustion fume at the outlet of the combustion device, preferably consisting of carbon dioxide (CO2), water vapor, and optionally molecular oxygen. - The fuel is a hydrocarbon, preferably an alkane-type saturated hydrocarbon (C n H 2n+2 ) - Combustion fumes produced at the outlet of the combustion device contain carbon dioxide (CO2), water vapor, optionally molecular oxygen, and one or more contaminants, more preferably particulate matter, SOx, NOx, acids, heavy metals, ammonia, and VOCs. - Combustion fumes have some or all of their contaminants removed as they pass through the condensation unit. - Combustion fumes have some or all of their contaminants removed before passing through the condensation unit. - The dehumidified gas has 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 unrecycled portion of the dehumidified gas. [Brief explanation of the drawing]

[0025] The features and advantages of the present invention will become more apparent upon reading the following detailed description of several specific alternative embodiments of the invention. These specific embodiments are described with reference to the accompanying drawings by examples of the invention that are not limited to or exhaustive. [Figure 1] Figure 1 is a schematic diagram of a first specific alternative embodiment of the combustion apparatus of the present invention. [Figure 2] Figure 2 schematically shows a specific alternative embodiment of the exchanger that can be used in the condensing unit of the combustion system in Figure 1. [Figure 3] Figure 3 schematically shows a second specific alternative embodiment of the combustion apparatus of the present invention, which performs recycling of a portion of the combustion fumes before condensation. [Figure 4] Figure 4 is a schematic diagram of a third specific alternative embodiment of the combustion apparatus of the present invention, which performs the removal of contaminants from the combustion fumes as the combustion fumes pass through a condensation unit. [Figure 5] Figure 5 is a schematic diagram of a fourth specific alternative embodiment of the combustion apparatus of the present invention, which uses a unit to remove contaminants from the dehumidified gas at the outlet of the condensing unit before the dehumidified gas is recycled toward the oxidizing gas production unit. [Figure 6] Figure 6 is a schematic diagram of a fifth specific alternative embodiment of the combustion apparatus of the present invention, which performs the removal of contaminants from the combustion fumes before the combustion fumes are introduced into the condensation unit. [Figure 7] Figure 7 schematically shows a specific alternative embodiment of a cleaning device that can be used in the decontamination unit of the combustion system shown in Figure 5 or Figure 6. [Figure 8] Figure 8 is a schematic diagram of a sixth specific alternative embodiment of the combustion apparatus of the present invention, in which a heat exchanger is used to remove some of the calories from the combustion fumes and these calories are used to heat the recycled portion of the dehumidified gas. [Modes for carrying out the invention]

[0026] Figure 1 schematically shows a first alternative embodiment of the combustion system of the present invention, which includes the following: - Combustion device 1 is supplied with fuel C by supply means 2 during operation; - Unit 3 for producing oxidizing gas GC, which enables the supply of oxidizing gas GC to combustion device 1 during operation; - A condensation unit 4 suitable for condensing the combustion fumes F produced by the combustion device 1; - Recycling means 5 that allows at least one recycled portion GDR of the dehumidified gas GD obtained at the outlet of condensation unit 4 to be supplied to oxidizing gas production unit 3; - A unit 6 for supplying molecular oxygen to the oxidizing gas production unit 3; - Adjustment unit 7.

[0027] The oxidizing gas production unit 3 enables the production of an oxidizing gas GC in operation, which is obtained from a mixture of recycled partial GDR of the dehumidified gas GD obtained at the outlet of the condensing unit 4 and 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 cryogenic engineering, 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 in situ, but may simply include means for storing molecular oxygen that has been produced in advance elsewhere.

[0029] The combustion device 1 generally enables the oxygenated combustion of fuel C by the oxidizing gas GC in the combustion chamber, and the thermal energy generated from this combustion can be used in a heat-exchangeable manner according to the present invention in any type of application requiring heat supply, not limited to heating a fluid in a heating device (not shown), for example. The combustion device may also be a boiler, a furnace, etc., according to the present invention.

[0030] The recycling of the dehumidified gas GD obtained at the outlet of the condensation unit 4 into a recycled partial GDR at the inlet of the production unit 3 allows for better control of the oxidative combustion reaction in the combustion device 1 and a significant reduction in the combustion temperature in the combustion device 1, compared to the oxygen combustion reaction carried out using only pure molecular oxygen as the oxidizer in a method known to the present day.

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

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

[0033] The particular alternative embodiment shown in Figure 1 is especially suitable for operation with fuel C, which produces a combustion fume consisting of carbon dioxide (CO2), water in the form of water vapor (H2O), and optionally molecular oxygen, and which is free of contaminants, such as SOx, NOx, or acid-type contaminants.

[0034] Therefore, in a non-exclusive and non-exclusive embodiment, the fuel C used in the combustion system of Figure 1 may be, for example, any type of hydrocarbon, such as conventional hydrocarbons derived from oil or natural gas, or special hydrocarbons derived from shale gas or oil, bituminous shale or sand, coal gas, biogas, synthesis gas, etc.

[0035] For example, fuel C is an alkane-type saturated hydrocarbon (C n H 2n+2 When this is the case, the combustion reaction in the apparatus is known to be: TIFF0007886894000001.tif11166

[0036] The condensing unit 4 is suitable for condensing the combustion fumes F produced by the combustion apparatus 1 by bringing these combustion fumes F into contact with a coolant L, so as to produce a dehumidified gas GD having a lower absolute humidity than the combustion fumes F at the inlet of the condensing unit 4.

[0037] The condensation unit 4 may generally include any type of exchanger that allows the combustion fumes to come into direct contact with the coolant L, the temperature of which is lower than the temperature 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 Figure 2, the exchanger 40 includes a bath 401 of coolant L and an enclosure 400 that includes an injection means 403 suitable for introducing combustion fumes F below the surface S of the bath of coolant L (Figure 2).

[0039] These injection means 403 may include a fan or compressor 403f and a duct 403a that includes, for example, an intake opening 403b in its upper portion 403c. The lower portion 403d of the injection duct 403a is immersed in a bath 401 of coolant L and includes a discharge opening 403e immersed in the bath 401 of coolant L.

[0040] In operation, a fan or compressor 403f allows combustion fumes F to be drawn in at the outlet of the combustion device 1 and introduced 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 forcibly introduced into the bath of coolant L 401 below the surface S of the bath of coolant L, rise to the surface S of the liquid bath, and escape from the enclosure 400 through the discharge opening 400a of the enclosure 400 in the form of the dehumidified gas GD described above.

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

[0042] The absolute humidity of the gas (g of water / kg of dry air) represents the number of grams of water vapor present in a given volume of gas relative to the mass of dry gas in the volume expressed in kilograms. This value remains constant even if the temperature of the gas fluctuates, as long as it remains greater than the dew point of the gas.

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

[0044] While passing through the bath 401 of the coolant L, the combustion fumes F undergo condensation when coming into contact with the coolant L, and the absolute humidity of the dehumidified gas GD at the outlet of the condensation unit 4 becomes lower than the absolute humidity of the combustion fumes F at the inlet of the condensation unit 4.

[0045] The difference between the absolute humidity of the dehumidified gas GD and the absolute humidity of the combustion fumes F depends particularly on the temperature T F of the combustion fumes F and the low temperature T L of the coolant L. The greater the temperature difference ΔT (ΔT = T F - T L ) between the temperature T F of the combustion fumes F and the temperature T L of the coolant L, the lower the absolute humidity of the dehumidified gas GD becomes in comparison to the absolute humidity of the combustion fumes F.

[0046] Upon exiting the bath 401 of the coolant L, the relative humidity of the dehumidified gas GD, on the other hand, becomes higher and can be close to saturation or reach saturation, i.e., 100% relative humidity, under certain operating conditions.

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

[0048] In another alternative embodiment, the condensation unit 4 can include a plurality of heat exchangers 40 mounted one after the other.

[0049] The present invention is not limited to the use of the type of exchanger 40 shown in Figure 2. In other alternative embodiments, the exchanger 40 for condensing combustion fumes F may be of the type described, for example, in international patent applications WO2016 / 071648 or WO2020 / 030419, or it may be an exchanger operated by injecting coolant L so that the coolant L comes into contact with the combustion fumes F.

[0050] Regardless of the type of exchanger used for condensing combustion fumes by bringing the combustion fumes F into contact with the coolant L, the adjustment unit 7 controls the temperature T of the coolant L in the condensation unit 4. L It is suitable for automatic adjustment.

[0051] In particular, referring to Figure 1, in order to automatically adjust the temperature of the coolant L, the combustion system preferably includes at least one of the following humidity sensors: - Sensor C1 that outputs a measurement signal S1 to measure the (absolute or relative) humidity in the recycled portion of the dehumidified gas GDR; - Sensor C2 that sends a measurement signal S2 for measuring the (absolute or relative) humidity of the combustion gas GC introduced into the combustion device 1; - Sensor C3 that sends a measurement signal S3 to measure the (absolute or relative) humidity of the combustion fume at the outlet of combustion device 1.

[0052] In this alternative implementation, the adjustment unit 7 generally controls the temperature T of the coolant 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 It is designed to adjust automatically.

[0053] In one modified example, the adjustment unit 7 adjusts the temperature T of the coolant L in the condensing unit 4 based solely on the (absolute or relative) humidity measured by a single sensor among sensors C1, C2, and C3. L It is designed to adjust automatically.

[0054] In another modified example, the adjustment unit 7 adjusts the temperature T of the coolant L in the condensing unit 4 based on the (absolute or relative) humidity measured by at least two of the sensors 1, C2, and C3. L It is designed to adjust automatically.

[0055] In another variation, the adjustment unit 7 adjusts the temperature T of the coolant L in the condensing unit 4 based on the (absolute or relative) humidity measured by three sensors 1, C2, and C3. L It is designed to adjust automatically.

[0056] The automatic temperature adjustment of the coolant L by this adjustment unit 7 is made possible by controlling and automatically adjusting the absolute humidity in the recycled portion GDR of the dehumidified gas GD at the inlet of unit 3 to generate the oxidizing gas GC. L By increasing the temperature of the coolant L, the absolute humidity is increased in the recycled portion GDR of the dehumidified gas GD. L By lowering the absolute humidity, the recycled portion of the dehumidified gas GD (GDR) is reduced.

[0057] Using sensor C1, the temperature of the coolant L T L The automatic adjustment, for example, controls the (absolute or relative) humidity TH of the recycled portion GDR of the dehumidified gas GD at the inlet of unit 3 for generating oxidizing gas GC, within a predetermined and suitable operating range (TH) for combustion device 1. min ;TH max )(TH min <TH<TH max This can be done to maintain within ). The operating range is determined on a case-by-case basis according to the characteristics of the combustion device 1.

[0058] Using sensor C2, the temperature of the coolant L T L The automatic adjustment, for example, sets the (absolute or relative) humidity TH of the oxidizing gas GC at the inlet of the combustion device 1 within a predetermined operating range (TH) that is suitable for the combustion device 1. min ;TH max)(TH min <TH<TH max This can be done to maintain within ). This operating range is determined on a case-by-case basis according to the operating characteristics of the combustion device 1.

[0059] Using sensor C3, the temperature of the coolant L T L The automatic adjustment, for example, sets the (absolute or relative) humidity TH of the combustion fumes F at the outlet of the combustion device 1 within a predetermined operating range (TH) that is suitable for the combustion device 1. min ;TH max )(TH min <TH<TH max This can be done to maintain within the specified range. The operating range is determined on a case-by-case basis according to the operating characteristics of the combustion device 1.

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

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

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

[0063] Referring to Figure 1, the combustion apparatus further includes heating means 8 which advantageously allows heating of the recycled portion GDR of the dehumidified gas GD, which in operation allows raising the temperature of the recycled portion GDR of the dehumidified gas GD before it is introduced into unit 3 for generating oxidizing gas GC.

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

[0065] The purpose of raising the temperature of the recycled partial GDR of the dehumidified gas GD is to move the temperature of the recycled partial 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, preferably avoid, the risk of condensation of the oxidizing gas GC in the combustion apparatus 1 and to limit the formation of harmful rust on the walls of the combustion apparatus 1 over time.

[0066] In particular, it is up to those 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 predetermined temperature range, particularly within a 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 of the dehumidified gas GD (GDR) is high, and is actually even more useful when the condensation unit 4 uses the type of apparatus shown in Figure 2.

[0068] Figure 2 shows a special alternative embodiment of the adjustment unit 7 as an example not limited to the present invention. In this particular alternative embodiment, the adjustment unit 7 includes a cooling device 70 that enables changing the temperature of the coolant L of the exchanger 40, at least one temperature sensor C4 that sends out a measurement signal S4 for measuring the temperature of the coolant 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 at least one of the humidity measurement signals S1, S2, S3.

[0069] The electronic processing unit 71 can be, for example, a programmable electronic processing unit of the programmable automatic operation type, which is programmed to perform automatic temperature adjustment of the coolant L.

[0070] In particular, the electronic processing unit 71 processes a predetermined 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 The humidity measurement signals S1, S2, and S3 are used to determine at least one variable set temperature T =f(S1;S2;S3) set The system automatically calculates the temperature, and when the combustion system is in a stable operation state, the temperature measured by signal S4 is set to the set temperature T. set The cooling device 70 can be designed and specifically programmed to automatically control it in a manner substantially equivalent to that of the other device.

[0071] The electronic processing unit 71 also sets a variable set temperature range (T) from at least one of the humidity measurement signals S1, S2, S3 by a predetermined function f. min ;T max ) is automatically calculated, and when the combustion system is in stable operation (stable state), the temperature measured by signal S4 is within the set temperature range (T min ;T maxThe cooling device 70 can be designed and specifically programmed to automatically control itself so that it is maintained within the specified temperature range.

[0072] In particular, in a limited embodiment, and especially in a particular alternative embodiment shown in Figure 2, the cooling device 70 includes, for example, a plate changer type exchanger 701, which includes a first loop 701a through which a coolant L can be circulated in a closed manner by a pump 701b, and a second loop 701c through which a heat transfer fluid can be circulated in a closed manner by a pump 701d, the second loop 701c further provided with means 702 for cooling the heat transfer fluid. The heat transfer fluid circulating in the second loop 701c allows the coolant L circulating in the first loop to be cooled by non-contact heat exchange between the two liquids.

[0073] During the operation, the bath 401 of coolant L receives calories from the combustion fumes F as the combustion fumes F pass through the bath 401, which contributes to raising the temperature of the bath 401d of liquid L. The electronic processing unit 71 cools the coolant L sufficiently and sets the temperature measured by the signal S4 to the set temperature T set Maintain a value substantially equal to the set temperature range (T) in signal S4, or maintain the measured temperature within the set temperature range (T min ;T max Maintain within the above set temperature T set Or the above set temperature range (T min ;T max ), and according to the temperature measured in the liquid bath L (signal S4), the pumps 701b and 701d are automatically controlled individually by the control signals SC1 and SC2, respectively.

[0074] In a simpler alternative embodiment, the set temperature T set or set temperature range (T min ;T max These parameters are predetermined on a case-by-case basis to suit the combustion device and can be input as parameters in the adjustment unit 7. In this case, humidity sensors C1, C2, and C3 are not required.

[0075] Referring to Figure 1, the unrecycled portion GDNR of the dehumidified gas GD is processed by at least one CO2 capture unit 10, which enables CO2 capture by removing all molecular oxygen and water contained in the unrecycled portion GDNR of the dehumidified gas GD in a manner known to itself. The captured molecular oxygen can also be injected into unit 3 for generating oxidizing gas GC in order to reduce the consumption of molecular oxygen supplied by unit 6.

[0076] When the unrecycled portion (GDNR) of the dehumidified gas (GD) is free of contaminants, the CO2 capture operation is easier compared to CO2 capture in gases containing contaminants such as SOx, NOx, and acids.

[0077] Figure 3 shows a second modification of the combustion system, which differs from the combustion system in Figure 1, in that the apparatus includes a recycling means 5' upstream of the condensing unit 4, which allows for the recycling of a portion FR of the combustion fume F at the inlet of unit 3 for generating an oxidizing gas GC, i.e., a portion of the combustion fume F FR that was not dehumidified in the condensing unit 4.

[0078] Figure 4 shows a third modification of the combustion system, which is suitable not only for operation with fuel C that produces a combustion fume F consisting solely of carbon dioxide (CO2), water (H2O), and optionally molecular oxygen, but also for operation with fuel C that produces a combustion fume F containing, to a greater or lesser extent, various contaminants 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 particulate matter and / or heavy metals. This fuel C can be obtained, for example, from biomass or solid recovered fuel.

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

[0080] Referring to Figure 4, the combustion system differs from that in Figure 1 in that it further includes a supply device 9, which includes a tank 90, which contains at least one processing additive or a mixture of several different processing additives, and is connected by a conditioning unit 7, for example by the electronic processing unit 71 described above, to a condensing unit 4 controlled by a control signal SC3 via a supply pump 91 or equivalent.

[0081] In operation, the apparatus 9 allows for the addition of one or more processing additives to the coolant L of the condensing unit 4, in a manner controlled by the adjustment unit 7.

[0082] Treatment additives can be in various forms, particularly liquid, dry powder, or solution, and are adapted to the type of contaminants potentially present in the combustion fumes F.

[0083] The processing additive is selected so as to be able to come into contact with and react with at least one type of contaminant contained in the coolant L of the condensing unit 4 to neutralize the contaminant.

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

[0085] When combustion fumes F potentially contain NOx (oxide nitride) contaminants, the treatment additive may be a base such as NaOH or KOH, or calcium hydroxide Ca(OH)2 or hydrogen peroxide (H2O2).

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

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

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

[0089] The adjustment unit 7 is designed to automatically control the pump 91 by a control signal SC3 so as to automatically adjust the addition of the treatment additive to the coolant L, depending on the pH or concentration of the treatment additive measured by the sensor C5, for example, so that the pH of the coolant L is as close to 7 as possible, or so as to the lowest possible concentration of the treatment additive in the coolant L, particularly below a predetermined maximum threshold.

[0090] In the operation, when the combustion fumes F contain, to a greater or lesser extent, various contaminants such as, for example, SOx (sulfur oxides) and / or NOx (nitride oxides), and / or HCl (hydrogen chloride) and / or HF (hydrogen fluoride) type acids, and / or ammonia and / or particulate matter and / or heavy metals, particularly when they pass through the bath 401 of coolant L in the condensing unit 4 shown in Figure 2, it is advantageous for the contaminants to be captured, preferably neutralized in the coolant L if appropriate, which makes it possible to obtain a dehumidified gas (GD) with at least some of its contaminants sufficiently removed at the outlet of the condensing unit 4. This avoids recycling an excessive amount of contaminants at the inlet of unit 3 for generating oxidizing gas GC.

[0091] In another modification, it is also possible to use multiple supply devices 9 containing different processing additives and controlled in parallel by the adjustment unit 7.

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

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

[0094] Figure 6 shows a fifth modification of the combustion system, which differs from that of Figure 1 in that it further includes a decontamination unit 9B, which in this alternative embodiment is located between the combustion apparatus 1 and the condensation unit 4. The function of this decontamination unit 9B is to remove at least some, preferably all, of the contaminants contained in the combustion fumes F before they pass into the condensation unit 4, so that at least some, preferably a sufficient amount of contaminants are removed and the combustion fumes F', which mainly consist of CO2, H2O in the form of water vapor, and optionally molecular oxygen, are introduced into the inlet of the condensation unit 4.

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

[0096] In this particular embodiment, the decontamination unit 9A or 9B includes a cleaning device 90 which may consist of any type of exchanger that allows the dehumidified gas GD or the combustion fume F from which the contaminants will be removed by the cleaning solution to be brought into contact by any means, such that at least some of the contaminants contained in the dehumidified gas GD or combustion fume F from which the contaminants will be removed by the cleaning solution are captured in the cleaning solution.

[0097] In the preferred alternative embodiment shown in Figure 7, the cleaning device 9A (or 9B) is preferably of the type that includes a bath 901 of cleaning liquid 902 and an enclosure 900 that includes an injection means 903 suitable for introducing combustion fumes F or dehumidified gas GD that will remove contaminants below the surface S of the bath 901 of cleaning liquid 902.

[0098] These injection means 903 may include a fan or compressor 903f and a duct 903a that includes, for example, an upper portion 903c, an intake opening 903b. The lower portion 903d of the injection duct 903a is immersed in a bath 901 of cleaning fluid 902 and includes a discharge opening 903e that is immersed in the bath 901 of cleaning fluid 902.

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

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

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

[0102] The bath 901 of the washing solution 902 may remain the same throughout the entire process, or it may be automatically replaced with an uncontaminated washing solution during the process to keep the concentration of contaminants captured in the bath 901 of the washing solution 902 low.

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

[0104] The cleaning solution 902 may also contain one or more treatment additives, and may include at least one apparatus for supplying the treatment additives, as previously described for the modified example in Figure 4.

[0105] In another alternative embodiment, the decontamination unit 9A (or 9B) may include a plurality of cleaning devices 9A (or 9B) mounted side by side.

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

[0107] Figure 8 shows an alternative embodiment of the combustion apparatus that differs from that in Figure 1 in that the heating means 8 includes a gas / gas exchanger type heat exchanger 8B which includes an enthalpy loop 80 through which a heat transfer fluid circulates. This heat exchanger 8B allows at least some of the calories from the combustion fumes F to be taken and transferred to the recycled portion GDR of the dehumidified gas GD in order to obtain a desired temperature rise for the recycled portion GDR of the dehumidified gas GD before it is introduced into the unit 3 to produce the oxidizing gas GC.

[0108] The heating means 8, including the heat exchanger 8B, can also be used in addition to or instead of the heating means 8 described above in the modified examples of Figures 1, 3, 4, 5, and 6.

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

[0110] In another modification of the present invention, the combustion apparatus may also include such heating means 8 and not have automatic temperature control of the coolant L.

[0111] However, preferably the combustion apparatus includes both the adjustment unit 7 and the heating means 8.

Claims

1. A combustion system comprising: a unit (3) for producing an oxidizing gas (GC); a combustion device (1) that enables the combustion of a fuel (C) by the oxidizing gas (GC); a condensing unit (4) suitable for condensing the combustion fumes (F; F') produced by the combustion device (1) by bringing the combustion fumes (F; F') into contact with at least one coolant (L) to produce a dehumidified gas (GD); a recycling means (5) for supplying at least one recycled portion (GDR) of the dehumidified gas at the outlet of the condensing unit (4) to the oxidizing gas production unit (3); and a unit (6) for supplying molecular oxygen and providing molecular oxygen to the oxidizing gas production unit (3), wherein the oxidizing gas production unit (3) supplies the combustion device (1) with an oxidizing gas (GC) resulting from a mixture of molecular oxygen and the recycled portion (GDR) of the dehumidified gas (GD), and the combustion system further controls the temperature (T) of the coolant (L) of the condensing unit (4). Ｌ The combustion system further includes an adjustment unit (7) having a function to automatically adjust the following technical features (a) and / or (b): (a) The combustion system includes at least one sensor (C1) for measuring absolute humidity or relative humidity in the recycled portion of the dehumidified gas (GDR), and / or at least one sensor (C2) for measuring absolute humidity or relative humidity in the oxidizing gas (GC), and / or at least one sensor (C3) for measuring absolute humidity or relative humidity in the combustion fumes, and the adjustment unit (7) adjusts the temperature (T) of the coolant (L) of the condensing unit (4) based on the absolute humidity or relative humidity measured by sensor (C1) in at least the recycled portion of the dehumidified gas (GDR), and / or based on the absolute humidity or relative humidity measured in the oxidizing gas (GC) by at least sensor (C2), and / or based on the absolute humidity or relative humidity measured in the combustion fumes by at least sensor (C3). Ｌ ) has a function to automatically adjust and / or (b) The temperature (T) of the coolant (L) of the condensing unit (4) is controlled so that the adjustment unit (7) maintains the absolute humidity or relative humidity of the oxidizing gas (GC) within an operating range between a predetermined maximum absolute humidity or relative humidity and a predetermined minimum absolute humidity or relative humidity. Ｌ ) has a function to automatically adjust, however, the operating range is selected to be compatible with the combustion device (1).

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

3. The adjustment unit (7) adjusts the absolute humidity or relative humidity (TH) of the recycled portion (GDR) of the dehumidified gas (GD) to a predetermined operating range (TH ｍｉｎ ;TH ｍａｘ The temperature of the coolant (L) in the condensing unit (4) should be maintained within (T Ｌ The combustion system according to claim 1 or 2, having a function to automatically adjust ).

4. The adjustment unit (7) maintains the absolute humidity or relative humidity (TH) of the oxidizing gas (GC) within a predefined operating range (TH ｍｉｎ ; TH ｍａｘ ), and has a function of automatically adjusting the temperature (T Ｌ ) of the coolant (L) of the condensation unit (4). The combustion system according to claim 1.

5. The adjustment unit (7) adjusts the absolute humidity or relative humidity (TH) of the combustion fumes within a predetermined operating range (TH ｍｉｎ ;TH ｍａｘ The temperature of the coolant (L) in the condensing unit (4) should be maintained within (T Ｌ The combustion system according to claim 1, which has a function to automatically adjust ).

6. The adjustment unit (7) controls the temperature (T) of the coolant (L) of the condensing unit (4). Ｌ The temperature of the coolant (L) of the condensing unit (4) is maintained at a predetermined temperature or within a predetermined temperature range. Ｌ The combustion system according to claim 1, which has a function to automatically adjust ).

7. The combustion system according to claim 1, wherein the heating means (8 / 8B) is suitable for heating the recycled portion (GDR) of the dehumidified gas (GD) with the calories extracted from the combustion fumes.

8. The combustion system according to claim 1, comprising a heating means (8) suitable for heating the recycled portion (GDR) of the dehumidified gas (GD) such that the temperature of the oxidizing gas (GC) at the inlet of the combustion device (1) is within a predetermined temperature range, and / or 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. The combustion system according to claim 1, wherein the condensing unit (4) includes at least one condensing device (40) containing a bath (401) of coolant (L), and an injection means (403) that enables the movement of combustion fumes (F; F') through the bath (401), preferably the injection means (403) that enables the injection of combustion fumes (F; F') below the surface (S) of the bath (401).

10. The combustion system according to claim 1, further comprising a supply device (9) suitable for introducing one or more treatment additives into the coolant (L) to treat contaminants trapped in the coolant (L).

11. The combustion system according to claim 1, comprising at least one sensor (C5) for measuring the pH of a coolant (L) or the concentration of at least one contaminant 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 measured concentration.

12. The above at least one treatment additive is a base, particularly NaOH, KOH, Ca(OH) ２ The combustion system according to claim 10 or 11, wherein the fuel is either an acid, particularly sulfuric acid, or hydrogen peroxide, or a flocculant.

13. The combustion system according to claim 1, wherein the combustion system includes a decontamination unit (9A), the decontamination unit (9A) is located between a condensing unit (4) and a recycling location for the recycled portion of the dehumidified gas (GDR), and the decontamination unit (9A) has the function of removing at least some of the contaminants contained in the dehumidified gas (GD) obtained at the outlet of the condensing unit (4) so ​​as to recycle the recycled portion of the dehumidified gas (GDR), from which at least some of the contaminants have been removed, up to the inlet of the oxidizing gas production unit (3).

14. The combustion system according to claim 1, wherein the combustion system includes a decontamination unit (9B), the decontamination unit (9B) is located between the combustion device (1) and the condensation unit (4), and the decontamination unit (9B) has the function of removing at least some of the contaminants contained in the combustion fume (F) before the combustion fume (F') passes through the condensation unit (4), so as to allow the combustion fume (F') to be introduced into the inlet of the condensation unit (4) and remove at least some of the contaminants in the combustion fume (F').

15. The combustion system according to claim 13 or 14, wherein the decontamination unit (9A; 9B) is suitable for capturing one or more contaminants selected from particulate matter, SOx, NOx, acids, heavy metals, ammonia, and VOCs.

16. The combustion system according to claim 13 or 14, wherein the decontamination unit (9A; 9B) includes at least one cleaning device (90) suitable for bringing a dehumidified gas (GD) or combustion fume (F) that will remove contaminants into contact with a cleaning liquid (902).

17. The combustion system according to claim 16, wherein the cleaning device includes a bath (901) of cleaning liquid (902) and an injection means that enables the movement of a dehumidified gas (GD) or combustion fume (F) that will remove contaminants through the bath (901) of cleaning liquid (902), preferably the injection means that enables the injection of the dehumidified gas (GD) or combustion fume (F) that will remove contaminants below the surface of the bath of cleaning liquid.

18. The combustion system converts the unrecycled portion of dehumidified gas (GD) (GDNR) into carbon dioxide (CO2). ２ The combustion system according to claim 1, comprising a unit (10) for capturing )

19. A method for burning fuel (C) by the combustion system described in claim 1, wherein the combustion device (1) comprises fuel (C) and molecular oxygen (O ２ A method comprising supplying an oxidizing gas (GC) resulting from a mixture of (F; F') and a recycled portion (GDR) of dehumidified gas obtained from combustion fumes (F; F').

20. The method according to claim 19, wherein the temperature of the coolant (L) is automatically adjusted.

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

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

23. 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 predetermined temperature range, and / or 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. Fuel (C) emits carbon dioxide (CO) at the outlet of the combustion device (1). ２ The method according to claim 19 or 20, wherein the method is selected to produce a combustion fume (F) comprising, preferably, water vapor and optionally molecular oxygen.

25. Fuel (C) is a hydrocarbon, preferably an alkane-type saturated hydrocarbon (C ｎ H ２ｎ＋２ The method according to claim 24, which is as follows.

26. The combustion fumes (F) produced at the outlet of the combustion device (1) are carbon dioxide (CO2). ２ The method according to claim 19 or 20, comprising water vapor, optionally molecular oxygen, and one or more contaminants, more preferably particulate matter, SOx, NOx, acids, heavy metals, ammonia, and VOCs.

27. The method according to claim 26, wherein all or some of the contaminants are removed as the combustion fumes pass through the condensation unit (4).

28. The method according to claim 26, wherein all or some of the contaminants are removed before the combustion fumes pass through the condensation unit (4).

29. The method according to claim 26, wherein the dehumidified gas (GD) has 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 (CO2) ２ The method according to claim 19 or 20, wherein the ) is captured from the unrecycled portion (GDNR) of the dehumidified gas (GD).

Images