BURNER FOR FIBER LOADING BY INTERNAL CENTRIFUGATION

Abstract

Annular burner (10) for internal centrifugal fiber spinning of glass fibers, comprising a combustion chamber (12), a combustion chamber casing (14), an ejection nozzle (18) and a fuel and oxidizer supply system (20) to the combustion chamber (12) in gaseous state, the fuel comprising dihydrogen and the oxidizer 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) into the injectors (22), the fuel distribution ring (24) comprising a fuel inlet conduit (26) into the fuel distribution ring (24) and the distribution ring (24) forming with the casing (14) a fuel distribution chamber (28),the fuel distribution chamber (28) being in direct fluidic communication with at least two injectors (22) of the plurality of injectors. Figure for the abbreviation: Fig. 1,

Description

Title of the invention: BURNER FOR FIBER SPLITTING BY INTERNAL CENTRIFUGATION technical field

[0001] The present description relates to a burner for internal centrifugal fiberization, in particular of glass fibers for the manufacture of glass wool. Previous technique

[0002] Mineral wool is known to be manufactured by a fiber-pulling process. The fiber-pulling process commonly used for glass fiber is the so-called internal centrifugal process. It consists of introducing a stream of the molten, stretchable material into a centrifuge comprising a basket and a fiber-pulling plate that are fixed together and rotate at high speed. The fiber-pulling plate may or may not be equipped with a base and is perforated around 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 centrifugal force Internal combustion. This burner includes multiple injectors that deliver fuel and oxidizer separately to the injector, mix the fuel and oxidizer within the injector, and then deliver the fuel / oxidizer mixture to the burner's combustion chamber. One advantage of this separate feeding system is reduced energy consumption by preheating only the oxidizer.

[0004] However, the combustion of the fuel, for example methane, and the oxidizer, for example oxygen from the air, in the combustion chamber generally generates a very large quantity of carbon dioxide. In addition, this reaction can generate nitrogen oxides, sulfur oxides, carbon monoxide, and unburned hydrocarbons.

[0005] Since reducing greenhouse gas emissions is a major concern, reducing carbon dioxide emissions is an area for improving devices used to manufacture mineral wool, particularly glass wool, while ensuring the safety of these devices. Description of the invention

[0006] The present exposition aims to remedy at least some of these drawbacks.

[0007] To this end, the present description relates to an annular burner for internal centrifugal fiber blasting of glass fibers, comprising a combustion chamber, a combustion chamber shell, an ejection nozzle and a fuel and oxidizer supply system for the combustion chamber in a gaseous state, the fuel comprising dihydrogen and the oxidizer 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 into the injectors, the fuel distribution ring comprising a fuel inlet conduit into the fuel distribution ring and the fuel distribution ring forming with the shell a fuel distribution chamber,the fuel distribution chamber being in direct fluidic 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 supply system, the fuel distribution ring and the fuel distribution chamber are also annular in shape.

[0009] The terms "annular" or "annular-shaped" refer to elements that have a general annular shape, that is, they are present all around the axis of rotational symmetry of the annular burner. However, these elements may not have rotational symmetry.

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

[0011] Such separate injection prevents the risk of flashback, in the absence of an oxidizer / fuel mixture upstream of the injector, and offers the possibility of preheating the oxidizer before injection, which improves combustion efficiency and lowers the flammability (ignition) limit of the mixture. It is therefore possible to further reduce fuel consumption, which in turn reduces combustion gas emissions (carbon dioxide). It should be noted that such preheating is prohibited in the context of a premixed fuel and oxidizer, 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 use of an oxidizer comprising dihydrogen makes it possible to reduce carbon dioxide emissions.

[0014] However, the use of dihydrogen can lead to risks due to leaks of unburned dihydrogen in the annular burner and the high flammability of dihydrogen even at high dilution in ambient air.

[0015] The presence of a fuel distribution ring, which forms a fuel distribution chamber with the casing, with the fuel distribution ring thus positioned around the combustion chamber casing, reduces the number of seals in the combustion chamber supply system. Indeed, since at least two injectors are supplied directly by the fuel circulating in the fuel distribution chamber, it is possible to eliminate the need for conduits supplying each injector and the seals connecting each conduit to the fuel inlet and to an injector.

[0016] In some embodiments, the fuel distribution chamber is in direct fluidic communication with the plurality of injectors.

[0017] The oxidizer is introduced into the combustion chamber which supplies all the injectors with oxidizer. The number of seals is reduced and the risk of leakage of oxidizer containing dihydrogen is also greatly reduced.

[0018] In some embodiments, the inlet conduit is arranged tangentially with respect to the fuel distribution ring.

[0019] It is understood that the inlet duct has a principal axis and that the principal axis of the inlet duct is disposed tangentially with respect to the fuel distribution ring. The fuel thus enters the fuel distribution chamber tangentially.

[0020] 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.

[0021] In some embodiments, the fuel distribution ring comprises four inlet conduits.

[0022] The four inlet conduits are evenly distributed in the fuel distribution ring.

[0023] In some embodiments, the fuel distribution ring is a flange attached to the casing.

[0024] The flange is an annular flange.

[0025] In some embodiments, the flange is mounted in compression on the casing.

[0026] Since the flange is mounted in compression, the risks of fuel leakage are reduced.

[0027] In certain embodiments, the flange comprises a body and an annular fixing tab, the thickness of the body being strictly greater than the thickness of the annular fixing tab and the body being in axial stop against the casing.

[0028] The body and the annular fixing tab are one piece.

[0029] The annular fixing tab allows the flange to be fixed to the chamber casing combustion.

[0030] Since the annular fixing tab has a thickness less than the thickness of the flange body, the annular fixing tab can deform slightly during mounting of the flange onto the casing, thus ensuring a better seal between the flange and the casing. The deformation of the annular fixing tab is within the elastic deformation range of the annular fixing tab.

[0031] The body of the flange having a thickness greater than the thickness of the annular flange fixing tab, the body can receive flange fixing holes on the casing.

[0032] In some embodiments, the annular fixing tab includes an end for fixing the flange to the casing.

[0033] In some embodiments, the flange and the casing 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.

[0034] 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.

[0035] A distance measured parallel to the axis of revolution symmetry separating the contact surfaces of the envelope is strictly less than a distance measured parallel to the axis of revolution symmetry separating the contact surfaces of the flange.

[0036] Thus, when the flange is mounted on the casing, the body of the flange comes against the casing and when the flange is fixed on the casing, for example by screws, the annular fixing tab deforms in its elastic range and increases the compressive force between the body of the flange and the casing.

[0037] In some embodiments, the fuel distribution ring includes a housing for receiving a sealing gasket and a sealing gasket.

[0038] The sealing gasket is received in the receiving housing.

[0039] By way of non-limiting example, the sealing gasket is a "C" shaped sealing gasket.

[0040] In some embodiments, the annular burner includes an outer suction ring, the outer suction ring being arranged around the fuel distribution ring.

[0041] The outer suction ring allows air to circulate around the fuel distribution ring and to be drawn in and expelled at a distance from the burner in order to avoid the presence of dihydrogen due to a potential fuel leak outside the annular burner.

[0042] Thanks to the airflow around the fuel distribution ring, any fuel leakage is diluted in the air circulating 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.

[0043] The outer suction ring is configured so that a fuel leak including dihydrogen opens into a suction chamber delimited by the outer suction ring and the fuel distribution ring.

[0044] It is understood that the outer suction ring is arranged opposite the contact surfaces of the body and the casing.

[0045] In some embodiments, the outer suction ring is mounted around the fuel distribution ring and at a distance from the fuel distribution ring so that ambient air can be drawn into the outer suction ring, circulate around the flange and be drawn out to be expelled at a distance from the burner in order to avoid the presence of dihydrogen due to a potential fuel leak out of the annular burner.

[0046] Circulating air is thus introduced between the fuel distribution ring and the outer suction ring without having to provide a complex air inlet device.

[0047] In some embodiments, the outer suction ring includes a dihydrogen detector.

[0048] It is thus possible to detect the presence of a dihydrogen leak and stop the annular burner to avoid an excessive leak of dihydrogen.

[0049] By way of non-limiting example, the dihydrogen detector can be disposed in a suction duct of the outer suction ring.

[0050] In some embodiments, the annular burner comprises two external suction rings.

[0051] By way of non-limiting example, the annular burner comprises an upper suction outer ring and a lower suction outer ring. The upper suction outer ring is configured such that a fuel leak containing dihydrogen between the contact surface of the body and the contact surface of the casing opens into the suction chamber delimited by the upper suction outer ring and the fuel distribution ring. The lower suction outer ring is configured such that a fuel leak containing dihydrogen between the contact surface of the annular mounting tab and the contact surface of the casing opens into the chamber suction area delimited by the lower outer suction ring and the fuel distribution ring.

[0052] Two external suction rings allow a fuel leak between the body contact surface and the envelope contact surface to be separated and identified from a fuel leak between the annular fixing tab contact surface and the envelope contact surface.

[0053] 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.

[0054] By way of non-limiting example, dihydrogen can be mixed with another oxidant, for example methane, biogas, propane, liquefied petroleum gas.

[0055] In some embodiments, the fuel is dihydrogen.

[0056] It is understood that the fuel may contain impurities. Thus, the com The fuel comprises dihydrogen, and the remainder consists of impurities. For example, the fuel may comprise 99.5% dihydrogen by volume, or even 99.9% dihydrogen by volume.

[0057] In some embodiments, the oxidant has a dihydrogen content greater than or equal to 10% by volume, for example greater than or equal to 15% by volume.

[0058] In some embodiments, the oxidizer is air.

[0059] In certain embodiments, the injector is arranged radially with respect to the combustion chamber.

[0060] 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.

[0061] In some embodiments, the injector includes an angular deflector configured to generate an oxidizer flow whose flow is vortex-like.

[0062] In some 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.

[0063] Angular deflection refers to the modification by the injector of the oxidizer's trajectory in order to create a vortex flow. A "vortex" flow describes a flow moving in a spiral motion with a significant tangential, or azimuthal, component, such that a pressure decrease occurs along the injector's axis and induces the creation of an internal recirculation zone. This internal recirculation zone allows the flame to ignite near the injector's outlet. Indeed, such a zone is characterized by high levels of negative axial velocities. Flame ignite retention is further facilitated by the presence of toroidal recirculation zones which bring back part of the burnt gases to the base of the combustion chamber thus resulting in significant preheating of the fresh gases.

[0064] Because the flame is more stable, it is possible to reduce the amount of fuel injected into the combustion chamber without risking flameout. Such an annular burner therefore significantly improves combustion efficiency, particularly in lean conditions, where the fuel-to-oxidant ratio is low. At the same heating power, fuel consumption and the resulting carbon dioxide emissions are thus reduced. Furthermore, the expanded operating range of the annular burner allows for greater flexibility in fiber loading conditions. This makes it possible to vary the diameter and / or length of the glass fibers.

[0065] Finally, since the improved flame attachment is due only to aerodynamic recirculation movements generated near the injector, an annular burner such as described above has improved durability over time compared to a "Bluff-body" type burner, and is also compatible with the injection of a premix of fuel and fuel, unlike a "Bluff-body" type burner.

[0066] The removable nature of the angular deflection ring makes it easier and cheaper to replace the latter, for maintenance reasons or to adapt said injector to a new operational operating range.

[0067] In some embodiments, the injector includes a central fuel injection conduit.

[0068] Central fuel injection allows for optimal mixing of the oxidizer and fuel. Brief description of the drawings

[0069] Other features and advantages of the subject matter of this presentation will become apparent from the following description of embodiments, given by way of non-limiting examples, with reference to the attached figures.

[0070] [Fig.1] Fig.1 is a schematic cross-sectional view of a half-burner according to one embodiment.

[0071] [Fig.2] The [Fig.2] is a schematic perspective view of a fuel distribution ring according to one embodiment.

[0072] [Fig.3] The [Fig.3] is a schematic cross-sectional view along plane III of the [Fig.2].

[0073] [Fig.4] The [Fig.4] is a schematic cross-sectional view along plane IV of the [Fig.2].

[0074] [Fig.5] The [Fig.5] is a schematic view of detail V of the [Fig.1].

[0075] [Fig.6] The [Fig.6] is a schematic view of detail VI of the [Fig. 1].

[0076] [Fig.7] The [Fig.7] is a schematic view of detail VII of the [Fig.1].

[0077] [Fig.8] Fig.8 is a partial schematic view of an annular burner including two external suction crowns.

[0078] [Fig.9] The [Fig.9] is a schematic perspective view of an injector according to one embodiment.

[0079] Across all figures, common elements are identified by identical numerical references. Detailed description

[0080] In what follows, the elements common to the different embodiments are identified by the same numerical references.

[0081] Figure 1 is a schematic cross-sectional view of an annular burner 10 according to an embodiment of the invention. Figure 1 represents a cross-sectional view of half of the annular burner 10. The annular burner 10 includes an X-axis of rotational symmetry. The annular burner 10 is an annular burner for internal centrifugal fiber formation of glass fibers.

[0082] In the embodiment of [Fig. 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 a casing 14.

[0083] By way of non-limiting example, the casing 14 is metallic, for example stainless steel, in particular austenitic stainless steel, especially austenitic stainless steel marketed under the name INOX 316L.

[0084] Subsequently, the terms "outside", "inside" are defined with respect to their proximity to the X axis of revolutional symmetry and the terms "upper", "lower" are defined with respect to the annular burner 10 in operation or positioned in an internal centrifugal fiber-spinning device.

[0085] In the embodiment of [Fig. 1], the casing 14 is annular in shape and comprises an outer casing 14A, an inner casing 14B and an upper casing 14C. The casing 14 includes cooling means (not shown) for the annular burner 10.

[0086] In the embodiment of [Fig.1], the combustion chamber 12 opens onto an ejection nozzle 18. The ejection nozzle 18 is annular in shape.

[0087] By way of non-limiting example, the ejection nozzle 18 is metallic, for example stainless steel, in particular austenitic stainless steel, especially austenitic stainless steel marketed under the name INOX 316L.

[0088] In the embodiment of [Fig. 1], the annular burner 10 comprises a The combustion chamber 12 is supplied with fuel 54 and oxidant 52 in a gaseous state by the combustion chamber 20. The fuel 54 comprises dihydrogen and the oxidant 52 comprises dioxygen.

[0089] 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.

[0090] By way of non-limiting example, dihydrogen can be mixed with another oxidant, for example methane, biogas, propane, liquefied petroleum gas.

[0091] In the embodiment of [Fig. 1], the fuel is dihydrogen, for example the fuel comprises 99.9% by volume of dihydrogen, the remainder being made up of impurities.

[0092] 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.

[0093] In the embodiment of [Fig. 1], the oxidizer is air.

[0094] The ejection nozzle 18 allows a gas obtained by combustion to be ejected into the combustion chamber 12, fuel 54 and oxidizer 52.

[0095] In the embodiment of [Fig.1], the fuel supply system 20 comprises a plurality of injectors 22 distributed uniformly around the combustion chamber 12 and opening into the combustion chamber 12.

[0096] By way of non-limiting example, the injector 22 is metallic, for example stainless steel, in particular austenitic stainless steel, especially austenitic stainless steel marketed under the name INOX 316L.

[0097] In the embodiment of [Fig.1], the injectors 22 are arranged radially with respect to the combustion chamber 12, that is to say that each injector 22 has a principal axis A (represented on [Fig.9]) and the principal axis A is arranged along a radius of the combustion chamber 12.

[0098] In the embodiment of [Fig. 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 for the oxidizer 52 towards the combustion chamber 12.

[0099] In the embodiment of [Fig.1], the fuel supply system 20 includes 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 fluidic communication with at least two injectors 22.

[0100] By way of non-limiting example, the fuel distribution ring 24 is metallic, for example made of stainless steel, in particular made of stainless steel. tenitic, in particular in austenitic stainless steel marketed under the name INOX 316L.

[0101] In the embodiment of [Fig. 1], the fuel distribution chamber 28 is in direct fluidic communication with the plurality of injectors 22, that is, with all the injectors 22 of the plurality of injectors. The fuel distribution chamber 28 is annular in shape.

[0102] 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.

[0103] In the embodiment of [Fig.1] and as shown in [Fig.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.

[0104] In the embodiment of [Fig.9], the angular deflector 50 comprises a plurality of lateral conduits 56 configured to permit the introduction of the oxidant 52.

[0105] In the embodiment of [Fig.1], the supply system 20 includes an oxidant distribution ring 32 opening into an oxidant distribution chamber 34. The oxidant distribution chamber 34 is annular in shape.

[0106] By way of non-limiting example, the oxidizer distribution ring 32 is metallic, for example stainless steel, in particular austenitic stainless steel, especially austenitic stainless steel marketed under the name INOX 316L.

[0107] In the embodiment of [Fig.1], the oxidant distribution chamber 34 is formed in the envelope 14.

[0108] In the embodiment of [Fig.2], the fuel distribution ring 24 comprises four fuel inlet conduits 26 into the fuel distribution ring 24, the inlet conduits 26 being evenly distributed in the fuel distribution ring 24.

[0109] In the embodiment of [Fig.2], the inlet ducts 26 are arranged tangentially with respect 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 with respect to the fuel distribution ring 24.

[0110] In the embodiment of [Fig.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.

[0111] In the embodiments of Figures 1 and 2, the distribution ring of the com combustible 24 is a flange 30 attached to the casing 14. The flange 30 is annular in shape.

[0112] In the embodiment of [Fig. 1], the flange 30 is mounted in compression on the envelope 14.

[0113] In the embodiments of Figures 1 and 2, the flange 30 comprises a body 30A and an annular mounting tab 30B. The body 30A and the annular mounting tab 30B are formed in one 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 mounting tab 30B.

[0114] In the embodiment of [Fig. 1], the body 30A is abutted against the envelope 14.

[0115] In embodiments of figures 1 and 2, the annular fixing tab 30B includes a fixing end 30C of the flange 30 on the casing 14.

[0116] In the embodiment of [Fig. 1], the flange 30 and the envelope 14 have contact surfaces with each other, the contact surfaces having a roughness Ra less than or equal to 1 pm.

[0117] In the embodiment of [Fig. 1] and as shown in [Fig. 5], a contact surface 30A1 of the body 30A is abutted, and therefore in contact, with a contact surface 14A1 of the casing 14 and a contact surface 30B1 of the annular fixing tab 30B, in particular the fixing end 30C of the annular fixing tab 30B is in contact with a contact surface 14A2 of the casing 14.

[0118] Since the flange 30 is 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 X axis separating the contact surfaces 14A1, 14A2 of the casing 14 is strictly less than a distance measured parallel to the X axis separating the contact surfaces 30A1, 30A2 of the body 30 and therefore of the fuel distribution ring 24.

[0119] In the embodiment of [Fig.1], the annular fixing lug 30B, in particular the fixing end 30C, allows the flange 30 to be fixed 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.

[0120] In the embodiment of [Fig.1], fixing holes 38 of the annular fixing tab 30B are provided in the fixing end 30C of the annular fixing tab 30B.

[0121] Thus, when the flange 30 is attached and fixed to the casing 14, the contact surface 30A1 of the body 30A comes into contact with and is compressed against the contact surface 14A1 of the casing 14, in particular the outer casing 14A, by the fixing of the annular fixing tab 30B, in particular of the fixing end 30C of the annular fixing tab 30B, on the envelope 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 envelope 14, the annular fixing tab 30B is deformed in its elastic range.

[0122] In the embodiments of figures 2 and 3, the body 30A of the flange 30 having a thickness El greater than the thickness E2 of the annular fixing tab 30B of the flange 30, the body 30A can receive fixing holes 36 of the flange 30 on the envelope 14, in particular of the body 30A on the envelope 14.

[0123] In the embodiments of figures 3 to 8, the flange 30 includes a receiving housing 40 for a sealing gasket and a sealing gasket 42 received in the housing 40.

[0124] 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.

[0125] In the embodiment of [Fig.1], the annular burner 10 includes an outer suction ring 44. The outer suction ring 44 is arranged around the fuel distribution ring 24.

[0126] In particular, in the embodiment of [Fig.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 in through the air inlets 46 in the outer suction ring 44, circulate around the fuel distribution ring 24 (i.e. the flange 30) and be drawn in to be expelled at a distance from the burner and / or directed into a hydrogen capture device.

[0127] The outer suction ring 44 is configured so that a fuel leak including dihydrogen opens into a suction chamber delimited by the outer suction ring 44 and the fuel distribution ring 24.

[0128] The outer suction crown 44 may include a dihydrogen detector.

[0129] By way of non-limiting example and as shown in [Fig.8], the dihydrogen detector can be disposed in a suction duct 48 of the outer suction ring 44.

[0130] In the embodiment of [Fig.8], the annular burner 10 comprises two outer suction rings 44, an upper outer suction ring 44A and a lower suction ring 44B.

[0131] In the embodiment of [Fig.8], the upper suction outer ring 44A is configured such that a fuel leak including di-hydrogen 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 suction outer ring 44A and the fuel distribution ring 24. The lower suction outer ring 44B is configured such that a fuel leak including di-hydrogen between the contact surface 30B1 of the annular fixing tab 30B and the contact surface 14A2 of the casing 14 opens into the suction chamber delimited by the lower suction outer ring 44B and the fuel distribution ring 24.

[0132] Two external suction rings 44A, 44B allow a fuel leak between the contact surface 30A1 of the body 30A and the contact surface 14A1 of the casing 14 to be separated from a fuel leak between the contact surface 30B1 of the annular fixing tab 30B and the contact surface 14A2 of the casing 14.

[0133] Although not shown in [Fig.8], the outer suction ring 44A includes a suction duct, for drawing in and expelling away from the annular burner and / or being directed into a hydrogen capture device, the air having circulated in the outer suction ring 44A.

[0134] In the embodiment of [Fig.8], the upper suction outer ring 44A and the lower suction outer ring 44B are mounted at a distance from the fuel distribution ring 24 so that ambient air can be drawn in through the air inlets 46 in the upper suction outer ring 44A and the lower suction outer ring 44B.

[0135] In some embodiments, the injector includes an angular deflector adapted to generate an oxidizer flow whose flow is vortex-like.

[0136] Although the present description has been made with reference to a specific embodiment, it is evident that various modifications and changes can 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 mentioned can be combined in additional embodiments. Therefore, the description and drawings should be considered in an illustrative rather than restrictive sense.

Claims

Demands

1. Annular burner (10) for internal centrifugal fiber spinning of glass fibers, comprising a combustion chamber (12), a combustion chamber casing (14), an ejection nozzle (18) and a fuel and oxidizer supply system (20) to the combustion chamber (12) in the gaseous state, the fuel comprising di-hydrogen and the oxidizer 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) into the injectors (22), the fuel distribution ring (24) comprising a fuel inlet conduit (26) into 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 fluidic communication with at least two injectors (22) of the plurality of injectors.

2. Annular burner (10) according to claim 1, in which the fuel distribution chamber (28) is in direct fluidic communication with the plurality of injectors (22).

3. Annular burner (10) according to claim 1 or 2, wherein the inlet duct (26) is disposed tangentially with respect to the fuel distribution ring (24).

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

5. Annular burner (10) according to claim 4, wherein the flange (30) is mounted in compression 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 tab (30B), a thickness (E1) of the body (30A) being strictly greater than a thickness (E2) of the annular fixing tab (30B) and the body (30A) being abutted 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 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.

8. Annular burner (10) according to any one of claims 1 to 7, wherein the fuel distribution ring (24) includes a receiving housing (40) for a sealing gasket and a sealing gasket (42).

9. 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. Ring burner (10) according to any one of claims 1 to 9, wherein the fuel (54) is dihydrogen.

11. Ring burner (10) according to any one of claims 1 to 10, wherein the oxidizer (52) is air.

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