Distribution ring for fuel in a burner, burner with such a distribution ring and drying drum with such a burner

Abstract

A fuel distribution ring in a burner (7) comprises a hollow body (21) designed in an annular shape with respect to a longitudinal axis (22), a feed nozzle (23) connected to the hollow body (21) for supplying the fuel into the hollow body (21) and several discharge nozzles (25) for delivering the fuel from the hollow body (21) to the burner (7), wherein the discharge nozzles (25) are each arranged on the outside of the hollow body (21) in the radial direction of the longitudinal axis (22).

Description

[0001] The invention relates to a distribution ring for fuel in a burner, a burner with such a distribution ring and a drying drum with such a burner.

[0002] US 2008 / 0280242 A1 discloses a coal burner assembly.

[0003] GB 2 085 575 A discloses a multi-fuel burner.

[0004] FR 612 480 A discloses a pulverized coal burner.

[0005] Burners for burning solids, particularly lignite dust, are also known from the prior art. The lignite dust is distributed using a so-called distribution ring and fed to the burner flame via fuel nozzles. During operation of the distribution ring, the fuel nozzles can become blocked by the lignite dust, which negatively impacts the burner flame, particularly the flame pattern. In particular, the flame length is reduced. The flame geometry is particularly asymmetrical. This results in incomplete, asymmetrical, uneven, and inefficient combustion.

[0006] The invention is based on the object of improving fuel combustion in a burner, in particular by ensuring reliable and uniform fuel supply.

[0007] The task is solved by a distribution ring for fuel with the features of the claim 1, by a burner having the features of claim 10 and by a drying drum having the features of claim 11 solved.

[0008] The core of the invention is that a distribution ring for fuel in a burner has a hollow body that is annular with respect to a longitudinal axis and has a plurality of discharge nozzles connected to it, wherein the discharge nozzles are each arranged on the outside of the hollow body in the radial direction with respect to the longitudinal axis. According to the invention, it was found that this prevents material from accumulating in the distribution ring, in particular in the hollow body. It was recognized that fuel particles that are fed into the distribution ring by means of compressed air are displaced radially outwards in the distribution ring due to the centrifugal forces of the fluid flow, in particular in the direction of the radially outer side wall of the hollow body.Because the discharge nozzles are positioned radially outward on the hollow body, i.e., at the maximum radial distance relative to the longitudinal axis, the fuel particles are automatically removed from the hollow body via the discharge nozzles. Fuel distribution is straightforward and fail-safe.

[0009] By preventing blockages in the discharge nozzles, an evenly distributed fuel supply is ensured. The resulting flame pattern is homogeneous and, in particular, symmetrical with respect to the longitudinal axis. The distribution ring according to the invention ensures efficient and, in particular, complete combustion, particularly residue-free.

[0010] A feed nozzle connected to the hollow body is used to feed the fuel into the hollow body. In particular, the feed nozzle enables the defined feeding of the fuel, particularly in a tangential direction, into the annular hollow body.

[0011] The fuel is in particular a solid, in particular lignite, hard coal, sewage sludge and / or biomass such as biofibres, in particular wood fibres, in particular wood dust and / or food residues.

[0012] The distribution ring has at least three, in particular at least four, in particular at least six, in particular at least eight, in particular at least ten, in particular at least twelve, in particular at least sixteen, in particular at least twenty and in particular at least twenty-four discharge nozzles. In particular, a maximum of one hundred discharge nozzles are arranged on the distribution ring. It is advantageous if an even number of discharge nozzles is present. In this case, a symmetrical arrangement of the discharge nozzles along the hollow body is possible, in particular such that the discharge nozzles are arranged in pairs diametrically opposite one another with respect to the longitudinal axis on the distribution ring. The number of discharge nozzles can also be odd.

[0013] A distribution ring according to claim 2 has increased reliability in the automatic release of the fuel particles. In particular, it has been found that a polygonal inner contour of the hollow body ensures advantageous particle guidance and particle release via the release nozzles. The polygonal inner contour is in particular quadrangular, in particular rectangular or trapezoidal, or in the shape of a parallelogram. The polygonal inner contour can also be an irregular polygon, in particular an irregular quadrilateral. It is particularly advantageous if an outer edge of the inner contour oriented in the radial direction is oriented parallel to the longitudinal axis, at least in sections. This ensures that, with respect to the radial direction relative to the longitudinal axis, the fuel particles are not undesirably displaced further radially outwards, which would hinder the automatic release of the fuel particles.

[0014] Alternatively, at least one edge of the inner contour can be curved, at least in sections. It is advantageous if the curvature is concave relative to the interior space enclosed by the hollow body.

[0015] A distribution ring according to claim 3 enables improved, in particular more uniform, delivery of the fuel into the burner flame. In particular, a circumferential angle between two adjacent delivery nozzles is identical, in particular for all delivery nozzles.

[0016] A distribution ring according to claim 4 improves the directed delivery of fuel into the burner flame. The delivery nozzles are directed with their respective nozzle longitudinal axes toward the center, i.e., inclined toward the longitudinal axis. The respective angle of inclination is greater than 0° and less than 90°. It is advantageous if the nozzle longitudinal axis and the longitudinal axis of the hollow body are arranged in a common plane.

[0017] A distribution ring according to claim 5 enables improved homogeneity of flame formation.

[0018] A distribution ring according to claim 6 enables a simple construction. In particular, the distribution ring can be designed essentially as a single piece with the discharge nozzles. A nozzle attachment is detachably mounted, in particular screwed, on each discharge nozzle. The respective nozzle attachment enables improved discharge of the fuel particles. The respective nozzle attachment can have a complex geometry. Because the nozzle attachment is manufactured separately and, in particular, independently of the hollow body, the nozzle attachment can be manufactured flexibly.

[0019] A distribution ring according to claim 7 enables a targeted conveyance of the fuel particles in the axial direction, in particular towards the discharge nozzles.

[0020] In a distribution ring according to claim 8, the axial conveyance of the fuel particles is improved.

[0021] A distribution ring according to claim 9 enables an, in particular continuous, axial conveyance of the fuel particles.

[0022] A burner according to claim 10 essentially has the advantages of the distribution ring, to which reference is hereby made. In particular, the distribution ring is connected to a primary fuel supply (in short: fuel supply) via the supply nozzle. The fuel supply comprises, in particular, a fuel source and / or a supply line. The fuel can be supplied by means of pneumatic conveying.

[0023] A drying drum according to claim 11 essentially has the advantages of the burner, to which reference is hereby made.

[0024] In particular, an end wall of the drying drum is designed such that a collision between the end wall, the burner head, and the fuel supply is avoided. This is achieved in particular by the end wall of the drying drum having an opening for the burner head and the fuel supply, which opening is in particular larger than the outer dimensions of the burner head and the fuel supply. In particular, a single opening is arranged in the end wall, in which the burner head and the fuel supply are arranged. The opening is in particular designed essentially keyhole-shaped.

[0025] Both the features specified in the patent claims and the features specified in the exemplary embodiment of a distribution ring according to the invention are suitable, either individually or in combination with one another, for further developing the subject matter of the invention. The respective combinations of features do not represent any limitation with regard to further developments of the subject matter of the invention, but are essentially merely exemplary in nature.

[0026] Further features, advantages, and details of the invention will become apparent from the following description of an embodiment with reference to the drawings. They show: Fig. 1 a perspective, partially sectioned view of a drying drum with a burner having a distribution ring according to the invention, Fig. 2 a partially sectioned view according to section line II-II in Fig. 1 , Fig. 3 an enlarged, partially sectioned view of the distribution ring on a burner head according to Fig. 1 , Fig. 4 a view according to arrow IV in Fig. 3 , Fig. 5 an enlarged detail view of detail V in Fig. 3 , Fig. 6a view according to arrow VI in Fig. 3 , Fig. 7a perspective view of the burner head with distribution ring from behind, Fig. 8a Fig. 7 corresponding perspective view from the front. Fig. 9 a partially sectioned view according to arrow IX in Fig. 3 .

[0027] One in Fig. 1 and 2The device, designated as a whole by 1, comprises a drying drum 3, which can be driven in rotation about a rotation axis 2, for drying and / or heating material, in particular material for asphalt production, in particular rock material, old asphalt granulate, and / or aggregates. The drying drum 3 is essentially hollow-cylindrical. The rotation axis 2 is arranged with respect to the horizontal at an angle of inclination h of the rotation axis, which is in particular greater than 0° and in particular less than 10°, in particular less than 5°, and in particular less than 3°.

[0028] As a result of the inclination of the drying drum 3, the material to be dried is conveyed in the drying drum 3 along a material conveying direction 4, which according to Fig. 1 oriented from left to right. At a Fig. 1 A material outlet 6 is arranged on the end wall 5 of the drying drum 3, shown on the right, through which the dried material is discharged from the drying drum 3. The material outlet 6 can be arranged at various positions in the circumferential direction around the rotation axis 2. It is also possible to arrange the material outlet 6 at several different locations.

[0029] On a second end wall opposite the end wall 5, which is in Fig. 1 not shown, a material inlet is arranged to feed the material to be dried to the drying drum 3.

[0030] A burner 7 is arranged on the end wall 5 and, in particular, is fastened to the end wall 5 and, in particular, is integrated into the end wall 5. In particular, the end wall 5 has an opening through which the burner 7 is guided and projects at least partially into an interior space surrounded by the drying drum 3.

[0031] The burner 7 has a burner housing 9 having a longitudinal burner axis 8, which can be arranged on the end wall 5 of the drying drum 3, in particular parallel and in particular concentrically to the rotational axis 2. The burner housing 9 is essentially hollow-cylindrical and has an air supply 10 and a secondary fuel supply 11 for secondary fuel and / or for auxiliary fuel. The secondary fuel supply 11 comprises a secondary fuel source, in particular a secondary fuel storage container 12, which is connected to the burner 7 via a secondary fuel supply line 13.

[0032] Furthermore, a primary fuel supply is connected to the burner 7, which has a primary fuel source 12a and a primary fuel supply line 13a connected thereto. For the sake of simplicity, the primary fuel source is referred to below as fuel source 12a and the primary fuel supply line as fuel supply line 13a.

[0033] A distribution ring 14 for the distributed supply of fuel to the burner 7 is arranged in the burner 7, in particular in the burner housing 9. The distribution ring 14 is connected to the fuel supply line 13a, which leads to the fuel source 12a. The distribution ring 14 is arranged, in particular, concentrically to the burner's longitudinal axis 8.

[0034] Additionally, a further secondary fuel supply is connected to the burner 7, which, like the secondary fuel supply 11, serves to supply secondary fuel and / or auxiliary fuel. The further secondary fuel supply comprises a further secondary fuel storage container 12b, which is connected to the burner 7 via a further secondary fuel supply line 13b.

[0035] The burner 7 further comprises an ignition burner 37, which is Fig. 1 is shown purely schematically. The pilot burner 37 is arranged within the burner housing 9. The pilot burner 37 can be arranged variably within the burner housing 9, in particular continuously or by means of a fastening device that predetermines several discrete fastening positions. The variable arrangeability of the pilot burner 37 is in particular with respect to a direction parallel and / or radial and / or in the circumferential direction with respect to the burner's longitudinal axis 8. The pilot burner 37 is fastened in particular to an inner side of the burner housing 9. The pilot burner 37 serves to ignite a burner flame.

[0036] During operation, the burner 7 generates a burner flame which extends from the burner 7 into the interior of the drying drum 3. By means of the burner 7, the heat is supplied along a heat supply direction 15 which is aligned with the material conveying direction 4 according to Fig. 1 is oriented in the opposite direction. Fig. 2 The drying drum 3 shown is operated in a countercurrent process. It is understood that a design of the drying drum 3 is possible in which the material conveying direction 4 and the heat supply direction 15 are oriented in the same direction, i.e., the drying drum 3 is operated in a cocurrent process. Such a drying drum is referred to as a parallel drum.

[0037] A swirling element 16 is arranged concentrically to the burner's longitudinal axis 8. The swirling element 16 serves to swirl the air supplied via the air supply 10, in particular the intake ambient air 10a, in particular in a tangential direction relative to the burner's longitudinal axis 8. The swirling element 16 can be designed as a baffle plate and in particular have a guide wheel. The swirling element 16 is in particular designed such that the intake ambient air 10a is mixed with the supplied fuel, in particular solid fuel, and / or possible secondary fuel and / or auxiliary fuel in such a way that the ignition properties and / or combustion properties of the mixture are improved and in particular optimized. The ignition properties and / or combustion properties are improved when the mixture is highly homogeneous.The mixture exhibits a high degree of homogeneity, particularly when the fuel is burned evenly and, in particular, completely within the mixture. Complete combustion can therefore be controlled, in particular, by ensuring that the exhaust gas stream leaving the drying drum 3 no longer contains any fuel components. During operation of the drying drum 3, it may be necessary to operate the drying drum 3 at various operating points, which can be selectively approached using a system control system.

[0038] In a plane perpendicular to the axis of rotation 2, the end wall 5 has an opening 38 which is essentially keyhole-shaped.

[0039] The opening 38 has an upper circular section in which the burner head 17 is arranged. An inner diameter of the circular section is larger than an outer diameter of the burner head 17, so that a circumferential annular gap 39 results between the opening 38 and the burner head 17. The burner head 17 and the opening 38 are arranged concentrically to one another and are each oriented concentrically with respect to the rotation axis 2.

[0040] In a lower area, the circular section of the opening 38 transitions into a U-shaped recess. The fuel supply line 13a is guided into the drying drum 3 through the U-shaped recess. The U-shaped recess is designed with a circumferential gap relative to the fuel supply line 13a. Accordingly, an annular gap 39 is formed along the inner contour of the opening 38, in particular also along the U-shaped recess.

[0041] In the following, with reference to Fig. 3 bis 9 the distribution ring 14 is explained in more detail.

[0042] The distribution ring 14 is arranged on a burner head 17 and is at least partially integrated therein. The burner head 17 is sleeve-shaped and has two cylinder sections 18, 19 arranged one behind the other along the burner's longitudinal axis 8, which are connected to one another by means of a conical section 20. The burner head 17 is arranged in the burner 7 such that the first cylinder section 18 faces the air supply 10 and the second cylinder section 19 faces the drying drum 3. The first cylinder section 18 has a first inner diameter D i,1 . The second cylinder section 19 has a second inner diameter D i,2 , which is larger than the first inner diameter D i,1 . In particular, the following applies: 1.0 · D i,1 < D i,2 < 2.0 · D i,1 , in particular 1.05 · D i,1 < D i,2 < 1.5 · D i,1 , in particular 1.1 · D i,1 < D i,2 < 1.3 · D i,1 .

[0043] The distribution ring 14 serves for the distributed supply of the fuel, i.e. fuel particles, in particular solid particles, into the burner 7, in particular into the burner head 17 and in particular into the second cylinder section 19.

[0044] The distribution ring 14 has a hollow body 21, which is annular with respect to a longitudinal axis 22 of the distribution ring 14. The distribution ring 14 is arranged concentrically on the burner head 17 and thus concentrically in the burner 7. This means that the longitudinal axis 22 and the burner longitudinal axis 8 coincide.

[0045] A feed nozzle 23 is connected to the hollow body 21. In particular, the feed nozzle 23 is integrally formed on the hollow body 21. The feed nozzle 23 is, in particular, directly connected to the fuel supply line 13 and, in particular, connected thereto.

[0046] The feed nozzle 23 is arranged eccentrically to the longitudinal axis 22. The feed nozzle 23 extends away from the hollow body 21 along a radial direction relative to the longitudinal axis 22. In the region of an opening point 24 of the feed nozzle 23 into the hollow body 21, the feed nozzle 23 has a curvature. As a result of the curvature, a fluid flow supplied to the hollow body 21, in particular a fuel particle-air mixture, is deflected. The fuel-air mixture initially flows in the feed nozzle 23 along the radial direction R and is then deflected in the tangential direction T towards the opening point 24 as a result of the curvature and fed into the hollow body 21.

[0047] The hollow body 21 provides a substantially circular flow direction for the fuel particles around the longitudinal axis 22.

[0048] The hollow body 21 has a plurality of discharge nozzles 25 through which the fuel is discharged to the burner 7 and in particular into the burner head 17. According to the exemplary embodiment shown, the hollow body 21 has sixteen discharge nozzles 25, which are arranged on the distribution ring 14 at equal distances from one another in the circumferential direction around the longitudinal axis 22. It is understood that more or fewer than sixteen discharge nozzles 25 can be present and / or arranged at different distances from one another in the circumferential direction. According to the exemplary embodiment shown, the discharge nozzles 25 are all arranged on a common circular line around the longitudinal axis 22, i.e., each with an identical radial distance from the longitudinal axis 22. It is also possible for individual discharge nozzles 25 to be arranged at different radial distances from the longitudinal axis 22.

[0049] According to the illustrated embodiment, all discharge nozzles 25 are identically designed. It is also possible for individual or all discharge nozzles 25 to be designed differently, particularly with regard to their geometry.

[0050] The discharge nozzles 25 are each arranged radially outwardly on the hollow body 21 relative to the longitudinal axis 22. This radially outward arrangement is particularly evident from the illustrations in Fig. 3 and 5 .

[0051] The hollow body 21 has a polygonal inner contour. According to the exemplary embodiment shown, the inner contour is quadrangular. The inner contour has an outer edge 26 located on the outside with respect to the radial direction of the longitudinal axis 22 and an inner edge 27, which are connected to one another via two axial edges 28 and 29 spaced apart from one another in the axial direction. According to the exemplary embodiment shown, the second axial edge 29, which is arranged in the region of the conical section 20 and is defined in particular by the second conical section 20, is arranged inclined with respect to a normal plane of the longitudinal axis 22. The first axial edge 28, which is arranged in particular in the region of the first cylinder section 18, is oriented in particular parallel to a normal plane of the longitudinal axis 22.

[0052] However, it is also conceivable that the two axial edges 28, 29 are oriented parallel to each other.

[0053] The discharge nozzle 25 is directly connected to the hollow body 21 via a through-opening 30 in the conical section 20. The through-opening 30 is arranged on the hollow body 21 such that it is located radially outward.

[0054] The discharge nozzles 25 are each hollow-cylindrical and have a nozzle longitudinal axis 31, each of which is arranged at an angle of inclination n relative to the longitudinal axis 22. According to the exemplary embodiment shown, the angle of inclination n is approximately 40°. It is understood that the angle of inclination n can vary, in particular depending on the position of the respective discharge nozzle 25 and in particular depending on the number of discharge nozzles 25. Additionally or alternatively, the angle of inclination n can also vary depending on the fuel used, in particular the solid fuel used, and in particular depending on a combination of different fuels. It is particularly advantageous if the angle of inclination n is identical for each discharge nozzle 25 and the nozzle longitudinal axes 31 intersect at a point P that lies on the longitudinal axis 22.

[0055] In particular, each nozzle's longitudinal axis 31 is arranged in a common radial plane with the longitudinal axis 22. If, as in the illustrated embodiment, an even number of discharge nozzles 25 are provided and two discharge nozzles 25 are arranged diametrically opposite one another with respect to the longitudinal axis 22, the nozzle's longitudinal axes 31 of the opposing discharge nozzles 25 are arranged together with the longitudinal axis 22 in a common radial plane.

[0056] As can be seen in particular from Fig. 5 A nozzle attachment 32 is arranged on each discharge nozzle 25 and, in particular, is placed onto the discharge nozzle 25. The nozzle attachment 32 enables, in particular, a targeted and directed fuel supply. The nozzle attachment 32 has a plug-on section whose inner contour corresponds to an outer contour of the discharge nozzle 25. In addition, the plug-on section is designed with an axial shoulder which serves as an axial stop along the nozzle longitudinal axis 31. For fastening, in particular in the axial direction relative to the nozzle longitudinal axis 31, the nozzle attachment 32 has a transverse bore into which a retaining screw 33 is screwed and serves to clamp the nozzle attachment 32 to the discharge nozzle 25. The nozzle attachment 32 is optional and can be omitted, in particular depending on the properties of the fuel used.

[0057] The nozzle attachment 32 is guided through a corresponding opening in a conical aperture 34 in the burner head 17. An annular air gap 32a is formed between the outer side of the nozzle attachment 32 and the opening. Air, in particular drawn-in ambient air 10a, can flow through the air gap 32a from the annular space between the conical section 20 and the conical aperture 34 to the burner flame. It is advantageous if the air gap 32a, depending on the geometry of the nozzle attachment 32 and / or the opening in the conical aperture 34, is designed such that the flame geometry is undisturbed by the air flowing in through the air gap 32a. The conical aperture 34 is oriented essentially parallel to the conical section 20 of the burner head 17. The opening in the conical aperture 34 is designed in particular in such a way that the retaining screw 33 can be accessed from the interior of the burner head 17.

[0058] The nozzle attachment 32 serves, in particular, to guide the fuel, in particular the solid fuel, through the conical orifice 34. If no nozzle attachment 32 is arranged on the discharge nozzle 25, the resulting air gap 32a is designed such that the flame geometry is not permanently disturbed by incoming air, in particular by the drawn-in ambient air 10a.

[0059] The distribution ring 14 has an axial extension oriented parallel to the longitudinal axis 22. The axial extension is defined by the distance between the axial edges 28, 29. If, as in the present embodiment, the axial edges 28, 29 are oriented at different angles of inclination to one another, the axial extension results from the average value between a maximum axial extension and a minimum axial extension. In the illustrated embodiment, the maximum axial extension is given at the outer edge 26 and the minimum axial extension at the inner edge 27.

[0060] According to the illustrated embodiment, the axial extension is maximum at the outlet point 24 and decreases in the conveying direction of the fuel, i.e., from the feed nozzle 23, in particular in the circumferential direction around the longitudinal axis 22, toward the discharge nozzle 25. In particular, the axial extension decreases continuously along the conveying direction and, in particular, linearly. This ensures that the fuel is automatically conveyed in the axial direction, i.e., toward the discharge nozzle 25. The discharge of the fuel from the hollow body 21 via the discharge nozzle 25 is thus evenly distributed and thus improved.

[0061] The axial extension a, which reduces in the circumferential direction, results in particular from the top view of the burner head 17 in Fig. 6 . A first in Fig. 6 The axial extension a 1 marked below is larger than the one in Fig. 6 The second axial extension a 2 marked above. The reason for this is that the rear side wall 36, which defines the first axial edge 28, is arranged at an inclination relative to a normal plane of the longitudinal axis 22. The greater the inclination of the side wall 36 relative to the normal plane, the greater the axial conveyance of the fuel particles. In particular, the rear side wall 36 is designed helically.

[0062] The operation of the burner 7 and, in particular, the distribution ring 14 is explained in more detail below. The burner 7 is operated to supply heat to the drying drum 3. For this purpose, the burner 7 is supplied with ambient air 10a, in particular, via the air supply 10, and with fuel, in particular solid fuel particles, via the primary fuel supply 12a, 13a. If necessary, additional fuel, in particular secondary fuel and / or auxiliary fuel, can be supplied from the at least one secondary fuel source 12, 12b via the at least one secondary fuel supply 13, 13b. By means of the swirling element 16 and the distribution ring 14, a favorable fuel-air mixture is generated in the burner head 17, which is ignited by an ignition burner 37, generating a burner flame.

[0063] Depending on the properties of the solid fuel, it may be necessary for the pilot burner 37 to first ignite a supporting flame generated from a secondary fuel before igniting the solid fuel, i.e., the primary fuel. To ignite the supporting flame, the secondary fuel flows into the burner 7 via the secondary fuel supply lines 13, 13b.

[0064] The fuel particle supply via the distribution ring 14 is effected from the fuel source 12a via the fuel supply line 13a, which is connected to the supply nozzle 23. From there, the fuel particle-air mixture is diverted from a radial flow R into a tangential flow T and fed into the hollow body 21. The corresponding flow arrows 35 are shown in Fig. 4 In the hollow body 21, the fuel particles flow essentially in the circumferential direction around the longitudinal axis 22.

[0065] This circumferential flow is superimposed by an axial flow component, i.e., a flow direction along the longitudinal axis 22 toward the discharge nozzles 25. This axial flow component is caused by the continuously decreasing axial extension of the hollow body 21.

[0066] As a result of the centrifugal forces acting on the flow particles in the hollow body 21, the fuel particles are moved toward the outer edge 26 of the hollow body 21. Because the discharge nozzles 25 are arranged in the region of the outer edge 26 of the hollow body 21, the fuel particles can be discharged, particularly automatically and without residue, from the hollow body 21 via the discharge nozzles 25 into the burner head 17 toward the burner flame. Blockages or clogging of the discharge nozzles 25 are avoided.

Claims

1. A distribution ring for fuel in a burner (7), which has fuel particles, wherein fuel particles are fed into the distribution ring (14) by means of compressed air and wherein the distribution ring (14) comprises a. a hollow body (21) which is configured to be annular with respect to a longitudinal axis (22), b. a feed spigot (23) that is connected to the hollow body (21) for feeding the fuel particles into the hollow body (21), c. a plurality of discharge spigots (25) for discharging the fuel particles from the hollow body (21) to the burner (7), wherein the discharge spigots (25) are each arranged externally at the hollow body (21) in the radial direction of the longitudinal axis (22).

2. A distribution ring according to claim 1, wherein the hollow body (21) has a polygonal inner contour (26, 27, 28, 29) in a sectional plane containing the longitudinal axis (22), wherein an outer edge (26) oriented with respect to the radial direction is oriented at least in sections and in particular completely parallel to the longitudinal axis (22).

3. A distribution ring according to any one of the preceding claims, wherein the discharge spigots (25) are spaced apart from each other, in particular uniformly, in the circumferential direction with respect to the longitudinal axis (22).

4. A distribution ring according to any one of the preceding claims, wherein the discharge spigots (25) each have a spigot longitudinal axis (31) which is arranged inclined with respect to the longitudinal axis (22) at an angle of inclination (n), wherein in particular: 0° < n < 90°, in particular 15° < n < 75° and in particular 30° < n < 60°.

5. A distribution ring according to claim 4, wherein the spigot longitudinal axes (31) of a plurality of, in particular all, discharge spigots (25) intersect at one point (P) which is located in particular on the longitudinal axis (22).

6. A distribution ring according to any one of the preceding claims, wherein a nozzle attachment (32) is detachably mounted on each of the discharge spigots (25).

7. A distribution ring according to any one of the preceding claims, wherein the hollow body (21) has an axial extension (a) that is oriented parallel to the longitudinal axis (22) and is variable in the circumferential direction with respect to the longitudinal axis (22).

8. A distribution ring according to claim 7, wherein the axial extension (a) is at a maximum at an opening point (24) of the feed spigot (23) into the hollow body (21).

9. A distribution ring according to claim 7 or 8, wherein the axial extension (a) decreases in the conveying direction of the fuel, in particular continuously and in particular linearly.

10. A burner having an air supply (10), a fuel supply (12a, 13a) and a distribution ring (14) according to any one of the preceding claims, wherein the distribution ring (14) is connected to the fuel feed (12a, 13a).

11. A drying drum having a burner (7) according to claim 10.

Images