Burner for internal centrifugal spinning

Abstract

The invention relates to a ring burner (10) for the internal centrifugal spinning of glass fibres, comprising a combustion chamber (12), a casing (14) for the combustion chamber, an ejection nozzle (18) and a supply system (20) for supplying the combustion chamber (12) with fuel in the gaseous or liquid state and oxidiser in the gaseous state, wherein the oxidiser comprises dioxygen, and wherein the supply system (20) comprises a plurality of injectors (22) distributed around the combustion chamber (12) and opening into the combustion chamber (12), and a fuel distribution ring (24) for distributing the fuel into the injectors (22), wherein the fuel distribution ring (24) comprises an inlet duct (26) for introducing the fuel into the fuel distribution ring (24), and wherein the distribution ring (24), together with the casing (14), forms a fuel distribution chamber (28), and wherein the fuel distribution chamber (28) is in direct fluid communication with at least two injectors (22) of the plurality of injectors.

Description

DESCRIPTION TITLE: BURNER FOR INTERNAL CENTRIFUGATION FIBER DRAWING Technical field

[0001] This disclosure relates to a burner for internal centrifugal fiberizing, in particular of glass fibers for the manufacture of glass wool. Prior art

[0002] Mineral wool is manufactured using a fiberizing process. The fiberizing process commonly used for fiberglass is the so-called internal centrifugation process. It consists of introducing a stream of the molten stretchable material into a centrifuge comprising a basket and a fiberizing plate that are integral in rotation and rotating at high speed. The fiberizing plate can alternatively be equipped with or without a base and is pierced at its periphery by a very large number of orifices through which the material is projected in the form of filaments under the effect of centrifugal force. By means of an annular burner, these filaments are then subjected to the action of an annular gaseous drawing current at high temperature and speed (up to 1000°C for the temperature, and 250 m / s for the speed, depending on the desired product) along the wall of the centrifuge which thins them and transforms them into fibers.

[0003] WO2023 / 186748 describes a burner for manufacturing mineral wool by internal centrifugation. This burner comprises a plurality of injectors for feeding the fuel and the oxidant separately into the injector, mixing the fuel and the oxidant in the injector in order to deliver the fuel / oxidant mixture into the combustion chamber of the burner. An advantage of this separate supply is that it allows energy consumption to be reduced by only preheating the oxidant.

[0004] However, the combustion of fuel, such as methane, and oxidant, such as oxygen from the air, in the combustion chamber typically generates a very large amount of carbon dioxide. In addition, this reaction can generate nitrogen oxide, sulfur oxides, carbon monoxide, and unburned hydrocarbons.

[0005] Since reducing greenhouse gas emissions is a major concern, reducing carbon dioxide emissions is a axis of improvement of devices allowing the manufacture of mineral wool, in particular glass wool, while guaranteeing the safety of these devices. Statement of the invention

[0006] This presentation aims to remedy at least part of these drawbacks.

[0007] For this purpose, the present disclosure relates to an annular burner for fiberizing by internal centrifugation of glass fibers, comprising a combustion chamber, a combustion chamber casing, an ejection nozzle and a system for supplying the combustion chamber with fuel in the gaseous or liquid state and oxidant in the gaseous state, the oxidant comprising dioxygen, the supply system comprising a plurality of injectors distributed around the combustion chamber and opening into the combustion chamber and a fuel distribution ring in the injectors, the fuel distribution ring comprising a fuel inlet duct in the fuel distribution ring and the fuel distribution ring forming with the casing a fuel distribution chamber,the fuel distribution chamber being in direct fluid communication with at least two injectors of the plurality of injectors.,

[0008] Since the burner is annular, it is understood that the combustion chamber, the casing, the ejection nozzle, the feed system, the fuel distribution crown and the fuel distribution chamber are also annular in shape.

[0009] "Annular" or "annular-shaped" means elements that have a generally annular shape, that is, they are present all around the axis of rotational symmetry of the annular burner. However, these elements may not be rotationally symmetrical.

[0010] The distribution chamber being a fuel distribution chamber, it is understood that the injector is configured to be supplied separately with fuel on the one hand, and with oxidant on the other hand.

[0011] Such separate injection makes it possible to prevent the risk of flashback, in the absence of an oxidant / fuel mixture upstream of the injector, and offers the possibility of preheating the oxidant before injection, which improves combustion efficiency and lowers the flammability (ignition) limit of the mixture. It is therefore possible to reduce more further fuel consumption, which also results in reducing combustion gas emissions (carbon dioxide). Note that such preheating is prohibited in the context of a premixture of fuel and oxidant, due to the risk of explosion.

[0012] The injectors are evenly distributed around the combustion chamber. This distribution allows for more uniform combustion in the combustion chamber.

[0013] The presence of a fuel distribution ring forming with the casing a fuel distribution chamber, the fuel distribution ring therefore being arranged around the casing of the combustion chamber, makes it possible to reduce the number of joints in the combustion chamber supply system. Indeed, at least two injectors being supplied directly by the fuel circulating in the fuel distribution chamber, it is possible to do without conduits supplying each injector and joints connecting each conduit to the fuel inlet and to an injector.

[0014] In some embodiments, the fuel distribution chamber is in direct fluid communication with the plurality of injectors.

[0015] The oxidant is introduced into the combustion chamber which supplies all the injectors with oxidant. The number of seals is reduced and the risk of oxidant leakage is also greatly reduced.

[0016] In some embodiments, the inlet conduit is disposed tangentially to the fuel distribution ring.

[0017] It is understood that the inlet duct has a main axis and that the main axis of the inlet duct is arranged tangentially to the fuel distribution ring. The fuel thus enters tangentially into the fuel distribution chamber.

[0018] This arrangement of the inlet duct allows for faster distribution and stabilization of the oxidant flow in the fuel distribution chamber and better distribution of the oxidant in the plurality of injectors.

[0019] In some embodiments, the fuel distribution ring includes four inlet conduits.

[0020] The four inlet ducts are evenly distributed in the fuel distribution ring.

[0021] In some embodiments, the fuel distribution ring is a flange attached to the casing.

[0022] The flange is a ring flange.

[0023] In some embodiments, the flange is compression mounted to the shell.

[0024] Since the flange is mounted in compression, the risk of fuel leakage is reduced.

[0025] In some embodiments, the flange comprises a body and an annular fixing lug, a thickness of the body being strictly greater than a thickness of the annular fixing lug and the body being in axial abutment against the casing.

[0026] The body and the annular fixing lug are made of a single piece.

[0027] The annular fixing lug allows the flange to be fixed to the combustion chamber casing.

[0028] Since the annular fixing lug has a thickness less than the thickness of the flange body, the annular fixing lug can deform slightly when the flange is mounted on the casing and can provide a better seal between the flange and the casing. The deformation of the annular fixing lug is within the elastic deformation range of the annular fixing lug.

[0029] The body of the flange having a thickness greater than the thickness of the annular flange fixing lug, the body can receive holes for fixing the flange to the casing.

[0030] In some embodiments, the annular attachment tab includes an end for attaching the flange to the casing.

[0031] In some embodiments, the flange and the shell have contact surfaces with each other, the contact surfaces having a roughness Ra less than or equal to 1 pm, preferably less than or equal to 0.9 pm.

[0032] Roughness Ra is also called the arithmetic mean of roughness. It is defined according to standard NF EN ISO 21920-2:2022 and measured according to standard NF EN ISO 21920-3:2022.

[0033] A distance measured parallel to the axis of symmetry of revolution separating the contact surfaces of the envelope is strictly less than one distance measured parallel to the axis of symmetry of revolution separating the contact surfaces of the flange.

[0034] Thus, when the flange is mounted on the casing, the body of the flange abuts against the casing and when the flange is fixed to the casing, for example by screws, the annular fixing lug deforms in its elastic domain and increases the compressive force between the body of the flange and the casing.

[0035] In some embodiments, the fuel distribution ring includes a seal receiving housing and a seal.

[0036] The seal is received in the receiving housing.

[0037] By way of non-limiting example, the seal is a “C” shaped seal.

[0038] In some embodiments, the annular burner includes an outer suction ring, the outer suction ring being disposed around the fuel distribution ring.

[0039] The outer suction ring allows air to circulate around the fuel distribution ring and to be sucked in to be discharged away from the burner in order to avoid the presence of dihydrogen due to a potential fuel leak from the annular burner.

[0040] By circulating air around the fuel distribution ring, any fuel leaks are diluted in the air flowing between the outer suction ring and the fuel distribution ring. This reduces the risk of fire and / or explosion that could result from a fuel leak.

[0041] The outer suction ring is configured such that a fuel leak comprising dihydrogen opens into a suction chamber delimited by the outer suction ring and the fuel distribution ring.

[0042] It is understood that the external suction crown is arranged opposite the contact surfaces of the body and the casing.

[0043] In some embodiments, the outer suction ring is mounted around the fuel distribution ring and spaced from the fuel distribution ring such that ambient air can be drawn into the outer suction ring, circulate around from the flange and be sucked to be discharged away from the burner in order to avoid the presence of fuel due to a potential leak of fuel out of the annular burner.

[0044] The circulating air is thus introduced between the fuel distribution ring and the external suction ring without having to provide a complex air inlet device.

[0045] In some embodiments, the outer suction ring includes a gas detector.

[0046] This allows the presence of a gas leak, for example dihydrogen or methane, to be detected and the annular burner to be stopped to prevent too much fuel from escaping.

[0047] By way of non-limiting example, the gas detector may be arranged in a suction duct of the external suction crown.

[0048] In some embodiments, the annular burner includes two outer suction rings.

[0049] By way of non-limiting example, the annular burner comprises an upper outer suction ring and a lower outer suction ring. The upper outer suction ring is configured such that a fuel leak between the contact surface of the body and the contact surface of the casing opens into the suction chamber delimited by the upper outer suction ring and the fuel distribution ring. The lower outer suction ring is configured such that a fuel leak between the contact surface of the annular fixing lug and the contact surface of the casing opens into the suction chamber delimited by the lower outer suction ring and the fuel distribution ring.

[0050] Two external suction rings allow to separate and identify a fuel leak between the contact surface of the body and the contact surface of the casing from a fuel leak between the contact surface of the annular fixing lug and the contact surface of the casing.

[0051] In some embodiments, the fuel is in a gaseous state and comprises dihydrogen and / or methane.

[0052] In some embodiments, the fuel comprises dihydrogen.

[0053] The use of an oxidizer containing dihydrogen makes it possible to reduce carbon dioxide emissions.

[0054] However, the use of dihydrogen can lead to risks due to leaks of unburned dihydrogen into the annular burner and the high flammability of dihydrogen even at high dilution in ambient air.

[0055] In some embodiments, the fuel has a dihydrogen content greater than or equal to 5% by volume, for example greater than or equal to 15% by volume, greater than or equal to 20% by volume, greater than or equal to 50% by volume, greater than or equal to 80% by volume, greater than or equal to 90% by volume.

[0056] In some embodiments, the fuel comprises methane.

[0057] In some embodiments, the fuel is natural gas.

[0058] As a non-limiting example, natural gas comprises between 85 and 95% by volume of methane.

[0059] In some embodiments, the fuel is biogas.

[0060] As a non-limiting example, biogas comprises approximately 80% methane by volume.

[0061] In some embodiments, the fuel is a mixture of gases.

[0062] By way of non-limiting example, dihydrogen may be mixed with another fuel, for example methane, natural gas, biogas, propane, liquefied petroleum gas.

[0063] By way of non-limiting example, the gas mixture may be a mixture of dihydrogen, carbon monoxide, carbon dioxide and methane.

[0064] For example, the gas mixture may comprise between 35 and 55% by volume of dihydrogen, between 20-45% by volume of carbon monoxide, between 5 and 25% by volume of carbon dioxide, between 3 and 9% by volume of methane, between 1.2 and 2% by volume of water vapor and unavoidable impurities.

[0065] In some embodiments, the fuel is dihydrogen.

[0066] It is understood that the fuel may include impurities. Thus, the fuel includes dihydrogen and the rest is made up of impurities. For example, the fuel may contain 99.5% by volume of dihydrogen, or even 99.9% by volume of dihydrogen.

[0067] In some embodiments, the fuel is liquid and comprises ammonia and / or ethanol.

[0068] In some embodiments, the oxidant has a dioxygen content greater than or equal to 10% by volume, for example greater than or equal to 15% by volume.

[0069] In some embodiments, the oxidizer is air.

[0070] In some embodiments, the injector is disposed radially relative to the combustion chamber.

[0071] It is understood that the injector has a main axis and the main axis of the injector is arranged along a radius of the combustion chamber.

[0072] In some embodiments, the injector includes an angular deflector configured to generate an oxidizer flow having a swirling flow.

[0073] In certain embodiments, the angular deflector is an angular deflection ring coaxial with the injector, preferably removable, comprising a lateral conduit configured to allow the introduction of the oxidant.

[0074] Angular deflection refers to the modification by the injector of the trajectory of the oxidant in order to make its flow vortex-like. A so-called "vortex-like" flow describes a flow animated by a spiral movement whose tangential component, also called azimuthal, is not negligible, so that a reduction in pressure occurs along the axis of the injector and induces the creation of an internal recirculation zone. The internal recirculation zone allows the flame to hang near the injector outlet. Indeed, such a zone is characterized by high levels of negative axial speeds. The flame hanging is further favored by the presence of toroidal recirculation zones which bring a portion of the burnt gases back to the base of the combustion chamber, thus leading to significant preheating of the fresh gases.

[0075] Since the flame is more stable, it is thus possible to reduce the quantity of fuel injected into the combustion chamber without risking the flame blowing out. Such an annular burner therefore makes it possible to significantly improve combustion efficiency, particularly in lean mode, in which the ratio of the quantity of fuel to the quantity of The combustion process is low. At the same heating power, fuel consumption and the resulting carbon dioxide emissions are therefore reduced. In addition, the enlargement of the operating range of the annular burner allows for greater flexibility in the fiberizing operating conditions. It is thus possible to vary the diameter and / or length of the glass fibers.

[0076] Finally, since the improved flame attachment is only due to aerodynamic recirculation movements generated near the injector, an annular burner as described above has improved durability over time compared to a “Bluff-body” type burner, and is also compatible with the injection of a pre-mixture of fuel and fuel, unlike a “Bluff-body” type burner.

[0077] The removable nature of the angular deflection ring makes it easier and more cost-effective to replace it for maintenance reasons or to adapt the injector to a new operational range.

[0078] In some embodiments, the injector includes a central fuel injection conduit.

[0079] Central fuel injection allows for optimal mixing of oxidant and fuel. Brief description of the drawings

[0080] Other characteristics and advantages of the subject of the present disclosure will emerge from the following description of embodiments, given as non-limiting examples, with reference to the appended figures.

[0081] [Fig. 1] Figure 1 is a schematic sectional view of a half-burner according to one embodiment.

[0082] [Fig. 2] Figure 2 is a schematic perspective view of a fuel distribution ring according to one embodiment.

[0083] [Fig. 3] Figure 3 is a schematic sectional view along plane III of Figure 2.

[0084] [Fig. 4] Figure 4 is a schematic sectional view along plane IV of Figure 2.

[0085] [Fig. 5] Figure 5 is a schematic view of detail V of Figure 1.

[0086] [Fig. 6] Figure 6 is a schematic view of detail VI of Figure 1.

[0087] [Fig. 7] Figure 7 is a schematic view of detail VII of the figure 1.

[0088] [Fig. 8] Figure 8 is a partial schematic view of an annular burner comprising two external suction rings.

[0089] [Fig. 9] Figure 9 is a schematic perspective view of an injector according to one embodiment.

[0090] Throughout the figures, common elements are identified by identical numerical references. Detailed description

[0091] In the following, the elements common to the different embodiments are identified by the same numerical references.

[0092] Figure 1 is a schematic sectional view of an annular burner 10 according to one embodiment of the invention. Figure 1 represents a sectional view of a half-annular burner 10. The annular burner 10 comprises an axis X of symmetry of revolution. The annular burner 10 is an annular burner for internal centrifugal fiberizing of glass fiber.

[0093] In the embodiment of Figure 1, the annular burner 10 comprises a combustion chamber 12. The combustion chamber 12 is annular in shape, that is to say it forms a ring around the axis X. The combustion chamber 12 is delimited by refractory materials 16 contained in an envelope 14.

[0094] By way of non-limiting example, the casing 14 is metallic, for example made of stainless steel, in particular austenitic stainless steel, in particular austenitic stainless steel marketed under the name INOX 316L.

[0095] Subsequently, the terms “exterior”, “interior” are defined in relation to their proximity to the X axis of symmetry of revolution and the terms “upper”, “lower” are defined in relation to the annular burner 10 in operation or positioned in an internal centrifugal fiberizing device.

[0096] In the embodiment of Figure 1, the envelope 14 is annular in shape and comprises an outer envelope 14A, an inner envelope 14B and an upper casing 14C. The casing 14 comprises cooling means (not shown) for the annular burner 10.

[0097] In the embodiment of Figure 1, the combustion chamber 12 opens onto an ejection nozzle 18. The ejection nozzle 18 is annular in shape.

[0098] By way of non-limiting example, the ejection nozzle 18 is metallic, for example made of stainless steel, in particular austenitic stainless steel, in particular austenitic stainless steel marketed under the name INOX 316L.

[0099] In the embodiment of FIG. 1, the annular burner 10 comprises a system 20 for supplying the combustion chamber 12 with fuel 54 in the gaseous state and with oxidant 52 in the gaseous state. The fuel 54 comprises dihydrogen and the oxidant 52 comprises dioxygen.

[0100] By way of non-limiting examples, the fuel has a dihydrogen content greater than or equal to 5% by volume, for example greater than or equal to 15% by volume, greater than or equal to 20% by volume, greater than or equal to 50% by volume.

[0101] By way of non-limiting example, dihydrogen may be mixed with another oxidant, for example methane, biogas, propane, liquefied petroleum gas.

[0102] In the embodiment of Figure 1, the fuel is dihydrogen, for example the fuel comprises 99.9% by volume dihydrogen, the remainder being impurities.

[0103] By way of non-limiting examples, the oxidant has a dihydrogen content greater than or equal to 10% by volume, for example greater than or equal to 15% by volume.

[0104] In the embodiment of Figure 1, the oxidant is air.

[0105] The ejection nozzle 18 makes it possible to eject a gas obtained by the combustion, in the combustion chamber 12, of the fuel 54 and the oxidant 52.

[0106] In the embodiment of Figure 1, the feed system 20 comprises a plurality of injectors 22 distributed uniformly around the combustion chamber 12 and opening into the combustion chamber 12.

[0107] By way of non-limiting example, the injector 22 is metallic, for example made of stainless steel, in particular austenitic stainless steel, in particular austenitic stainless steel marketed under the name INOX 316L.

[0108] In the embodiment of Figure 1, the injectors 22 are arranged radially relative to the combustion chamber 12, that is to say that each injector 22 has a main axis A (shown in Figure 9) and the main axis A is arranged along a radius of the combustion chamber 12.

[0109] In the embodiment of Figure 1, the casing 14 and in particular the outer casing 14A comprises a plurality of injection conduits 14A3. Each injection conduit 14A3 forms with the injector 22 a circulation chamber of the oxidant 52 towards the combustion chamber 12.

[0110] In the embodiment of FIG. 1, the supply system 20 comprises a fuel distribution ring 24 in the injectors 22, the fuel distribution ring 24 forming with the casing 14 a fuel distribution chamber 28 in direct fluid communication with at least two injectors 22.

[0111] By way of non-limiting example, the fuel distribution ring 24 is metallic, for example made of stainless steel, in particular austenitic stainless steel, in particular austenitic stainless steel marketed under the name INOX 316L.

[0112] In the embodiment of Figure 1, the fuel distribution chamber 28 is in direct fluid communication with the plurality of injectors 22, i.e., with all of the injectors 22 of the plurality of injectors. The fuel distribution chamber 28 is annular in shape.

[0113] In the embodiment of FIG. 1, the injectors 22 are configured to be supplied separately with fuel 54 on the one hand, and with oxidant 52 on the other hand.

[0114] In the embodiment of Figure 1 and as shown in Figure 9, the injector 22 comprises a central injection conduit 58 for the fuel 54 and an angular deflector 50. The angular deflector 50 is an angular deflection ring coaxial with the main axis A of the injector 22.

[0115] In the embodiment of Figure 9, the angular deflector 50 comprises a plurality of lateral conduits 56 configured to allow the introduction of the oxidant 52.

[0116] In the embodiment of Figure 1, the feed system 20 comprises an oxidant distribution ring 32 opening into an oxidant distribution chamber 34. The oxidant distribution chamber 34 is annular in shape.

[0117] By way of non-limiting example, the oxidant distribution ring 32 is metallic, for example made of stainless steel, in particular austenitic stainless steel, in particular austenitic stainless steel marketed under the name INOX 316L.

[0118] In the embodiment of Figure 1, the oxidizer distribution chamber 34 is formed in the casing 14.

[0119] In the embodiment of Figure 2, the fuel distribution ring 24 comprises four inlet conduits 26 for the fuel in the fuel distribution ring 24, the inlet conduits 26 being distributed uniformly in the fuel distribution ring 24.

[0120] In the embodiment of Figure 2, the inlet ducts 26 are arranged tangentially to the fuel distribution ring 24, that is to say that each inlet duct 26 has a main axis and that the main axis of each inlet duct 26 is arranged tangentially to the fuel distribution ring 24.

[0121] In the embodiment of Figure 2, each inlet conduit 26 comprises an inlet end 26A and an outlet end 26B, the outlet end 26B opening into the fuel distribution chamber 28.

[0122] In the embodiments of Figures 1 and 2, the fuel distribution ring 24 is a flange 30 attached to the casing 14. The flange 30 is annular in shape.

[0123] In the embodiment of Figure 1, the flange 30 is mounted in compression on the casing 14.

[0124] In the embodiments of Figures 1 and 2, the flange 30 comprises a body 30A and an annular fixing lug 30B. The body 30A and the annular fixing lug 30B are made of a single piece. As shown in Figures 3 and 4, a thickness E1 of the body 30A is strictly greater than a thickness E2 of the annular fixing lug 30B.

[0125] In the embodiment of Figure 1, the body 30A abuts against the casing 14.

[0126] In the embodiments of Figures 1 and 2, the annular fixing tab 30B comprises a fixing end 30C of the flange 30 on the casing 14.

[0127] In the embodiment of FIG. 1, the flange 30 and the casing 14 have contact surfaces with each other, the contact surfaces having a roughness Ra less than or equal to 1 pm.

[0128] In the embodiment of Figure 1 and as shown in Figure 5, a contact surface 30A1 of the body 30A is in abutment, and therefore in contact, with a contact surface 14A1 of the casing 14 and a contact surface 30B1 of the annular fixing lug 30B, in particular of the fixing end 30C of the annular fixing lug 30B is in contact with a contact surface 14A2 of the casing 14.

[0129] The flange 30 being mounted in compression on the casing 14, it is understood that, in the embodiment of FIG. 1 and as shown in FIG. 5, a distance measured parallel to the axis X separating the contact surfaces 14A1, 14A2 of the casing 14 is strictly less than a distance measured parallel to the axis X separating the contact surfaces 30A1, 30A2 of the body 30 and therefore of the fuel distribution ring 24.

[0130] In the embodiment of Figure 1, the annular fixing lug 30B, in particular the fixing end 30C, makes it possible to fix the flange 30 to the casing 14 of the combustion chamber 12, for example by means of screws passing through fixing holes 38 of the annular fixing lug 30B.

[0131] In the embodiment of Figure 1, fixing holes 38 of the annular fixing tab 30B are provided in the fixing end 30C of the annular fixing tab 30B.

[0132] Thus, when the flange 30 is attached and fixed to the casing 14, the contact surface 30A1 of the body 30A comes into abutment and is compressed against the contact surface 14A1 of the casing 14, in particular of the outer casing 14A, by the fixing of the annular fixing lug 30B, in particular of the fixing end 30C of the annular fixing lug 30B, on the casing 14. The distance separating the contact surfaces 30A1, 30A2 of the body 30 being strictly greater than the distance separating the contact surfaces 14A1, 14A2 of the casing 14, the annular fixing lug 30B is deformed in its elastic domain.

[0133] In the embodiments of figures 2 and 3, the body 30A of the flange 30 having a thickness E1 greater than the thickness E2 of the annular fixing lug 30B of the flange 30, the body 30A can receive fixing orifices 36 of the flange 30 on the casing 14, in particular of the body 30A on the casing 14.

[0134] In the embodiments of Figures 3 to 8, the flange 30 comprises a receiving housing 40 for a seal and a seal 42 received in the housing 40.

[0135] In the embodiments of Figures 3 to 8, the flange 30 comprises two receiving housings 40, a first housing opening onto the contact surface 30A1 of the body 30A and a second receiving housing 40 opening onto the contact surface 30B1 of the annular fixing tab 30B.

[0136] In the embodiment of Figure 1, the annular burner 10 comprises an outer suction ring 44. The outer suction ring 44 is arranged around the fuel distribution ring 24.

[0137] In particular, in the embodiment of Figure 1 and as shown in Figures 6 and 7, the outer suction ring 44 is mounted at a distance from the fuel distribution ring 24 so that ambient air can be drawn through the air inlets 46 into the outer suction ring 44, circulate around the fuel distribution ring 24, i.e. the flange 30) and be drawn in to be discharged at a distance from the burner and / or be directed into a hydrogen capture device.

[0138] The outer suction ring 44 is configured such that a fuel leak comprising dihydrogen opens into a suction chamber delimited by the outer suction ring 44 and the fuel distribution ring 24.

[0139] The outer suction crown 44 may include a dihydrogen detector.

[0140] By way of non-limiting example and as shown in FIG. 8, the dihydrogen detector can be arranged in a suction duct 48 of the external suction ring 44.

[0141] In the embodiment of Figure 8, the annular burner 10 comprises two outer suction rings 44, an upper outer suction ring 44A and a lower suction ring 44B.

[0142] In the embodiment of Figure 8, the upper outer suction ring 44A is configured so that a fuel leak comprising dihydrogen between the contact surface 30A1 of the body 30A and the contact surface 14A1 of the casing 14 opens into the suction chamber delimited by the upper outer suction ring 44A and the fuel distribution ring 24. The lower outer suction ring 44B is configured so that a fuel leak comprising dihydrogen between the contact surface 30B1 of the annular fixing lug 30B and the contact surface 14A2 of the casing 14 opens into the suction chamber delimited by the lower outer suction ring 44B and the fuel distribution ring 24.

[0143] Two external suction rings 44A, 44B make it possible to separate a fuel leak between the contact surface 30A1 of the body 30A and the contact surface 14A1 of the casing 14 from a fuel leak between the contact surface 30B1 of the annular fixing lug 30B and the contact surface 14A2 of the casing 14.

[0144] Although not shown in Figure 8, the outer suction ring 44A comprises a suction duct, for sucking in and for discharging at a distance from the annular burner and / or being directed into a device for capturing dihydrogen, the air having circulated in the outer suction ring 44A.

[0145] In the embodiment of Figure 8, the upper outer suction ring 44A and the lower outer suction ring 44B are mounted spaced from the fuel distribution ring 24 so that ambient air can be drawn through the air inlets 46 in the upper outer suction ring 44A and the lower outer suction ring 44B.

[0146] In some embodiments, the injector comprises an angular deflector adapted to generate a flow of oxidant whose flow is vortex-like.

[0147] Although the present disclosure has been described with reference to a specific exemplary embodiment, it is obvious that various modifications and changes may be made to these examples without departing from the general scope of the invention as defined by the claims. Furthermore, individual features of the various embodiments recited may be combined in additional embodiments. Therefore, the description and drawings should be considered in an illustrative rather than restrictive sense.

Claims

CLAIMS

1. Annular burner (10) for fiberizing glass fibers by internal centrifugation, comprising a combustion chamber (12), a casing (14) of the combustion chamber, an ejection nozzle (18) and a system (20) for supplying the combustion chamber (12) with fuel in the gaseous or liquid state and oxidant in the gaseous state, the oxidant comprising dioxygen, the supply system (20) comprising a plurality of injectors (22) distributed around the combustion chamber (12) and opening into the combustion chamber (12) and a fuel distribution ring (24) in the injectors (22), the fuel distribution ring (24) comprising an inlet duct (26) for the fuel in the fuel distribution ring (24) and the fuel distribution ring (24) forming with the casing (14) a fuel distribution chamber (28),the fuel distribution chamber (28) being in direct fluid communication with at least two injectors (22) of the plurality of injectors.,

2. The annular burner (10) of claim 1, wherein the fuel distribution chamber (28) is in direct fluid communication with the plurality of injectors (22).

3. An annular burner (10) according to claim 1 or 2, wherein the inlet duct (26) is arranged tangentially to the fuel distribution ring (24).

4. Annular burner (10) according to any one of claims 1 to 3, in which the fuel distribution ring (24) is a flange (30) attached to the casing (14).

5. An annular burner (10) according to claim 4, wherein the flange (30) is compression mounted on the casing (14).

6. Annular burner (10) according to claim 4 or 5, wherein the flange (30) comprises a body (30A) and an annular fixing lug (30B), a thickness (E1) of the body (30A) being strictly greater than a thickness (E2) of the annular fixing lug (30B) and the body (30A) abutting against the casing (14).

7. An annular burner (10) according to any one of claims 4 to 6, wherein the flange (30) and the casing (14) have surfaces in contact with each other, the contact surfaces having a roughness Ra less than or equal to 1 pm, preferably less than or equal to 0.9 pm.

8. An annular burner (10) according to any one of claims 1 to 7, wherein the fuel distribution ring (24) comprises a receiving housing (40) for a seal and a seal (42).

9. An annular burner (10) according to any one of claims 1 to 8, comprising an outer suction ring (44), the outer suction ring (44) being arranged around the fuel distribution ring (24).

10. An annular burner (10) according to any one of claims 1 to 9, wherein the fuel (54) is in the gaseous state and comprises dihydrogen and / or methane.

11. An annular burner (10) according to any one of claims 1 to 10, wherein the fuel (54) is liquid and comprises ammonia and / or ethanol.

12. An annular burner (10) according to any one of claims 1 to 11, wherein the oxidant (52) is air.

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