Fire grate and combustion unit

Abstract

Fire grate (2a, 2b, 2c) for a waste incineration plant, comprising a frame (5) with side walls (4a, 4b, 4c, 4d) and torsion shafts (6a, 6b, 6c, 6d) rotatably mounted on the frame (5), which at least partially cover an inner area (5a) of the frame (5), wherein the torsion shafts (6a, 6b, 6c, 6d) are operatively connected to a grate mechanism (8) which is configured to twist the torsion shafts (6a, 6b, 6c, 6d), wherein the grate mechanism (8) is arranged on at least one of the side walls (4b, 4d) of the frame (5) and is located at least partially, preferably completely, outside the inner area (5a) of the frame (5), characterized by the fact that at least one of the side walls (4a, 4b, 4c, 4d) of the frame (5) is double-walled, so that an interior space (13a, 13b, 13c, 13d) is formed in the at least one side wall (4a, 4b, 4c, 4d), and the frame (5) has inlet openings (10a, 10b) and outlet openings (10c, 10d) in the at least one double-walled side wall (4a, 4b, 4c, 4d), in particular at the end faces (11a, 11b, 11c, 11d), so that an airflow (12) can flow through the respective interior space (13a, 13b, 13c, 13d) in the at least one double-walled side wall (4a, 4b, 4c, 4d).

Description

[0001] The invention relates to a fire grate according to the features of the first claim and a combustion unit with a corresponding fire grate according to claim 7. The invention is applicable wherever fire grates are used, preferably in waste incineration plants.

[0002] For grate combustion in waste incineration plants, either sliding grates or roller grates are used, which are collectively referred to below as fire grates. These fire grates, which are known per se, have a frame and several torsion shafts. In the case of roller grates, the torsion shafts represent the grate rollers, while in the case of sliding grates, the torsion shafts are designed to drive grate bars of the sliding grate, so that by rotating the torsion shafts, the material to be combusted can be transported and / or stoked. The dimensions and number of torsion shafts and the total number of fire grates depend on the dimensions and the desired combustion capacity of the waste incineration plant.

[0003] The torsion shafts of the fire grates are typically spaced apart so that primary combustion air can be drawn through an inner area of ​​the frame into the burning waste bed (combustion bed) resting on the fire grate. Some or all of the torsion shafts are arranged to be movable or rotatable, so that the burning waste bed is slowly transported across the fire grate as combustion progresses continuously.

[0004] To enable movement or rotation of the torsion shafts, various drive mechanisms can be employed. For example, the grate rollers of a roller grate have their own rotary drives, while the torsion shafts of a sliding grate are driven by hydraulic cylinders to optimally adjust the transport speed of the waste bed to the locally varying combustion conditions. These and other drive mechanisms, along with other mechanical components that transmit the drive motion to the torsion shafts (e.g., levers, bearings), are collectively referred to below as grate mechanics.

[0005] The feeder upstream of a fire grate in a waste incineration plant, which uses slide gates to direct the supplied waste onto the grate, also typically has drive mechanisms, particularly hydraulic cylinders, to move the gate. These drive mechanisms, together with other mechanical components that transmit the drive movement to the gates, such as levers, bearings, etc., are collectively referred to below as the feeder mechanism.

[0006] Due to the high temperatures occurring in waste incineration plants, both the grate mechanism and the feeder mechanism are subjected to very high thermal stress and are therefore prone to wear and failure. This reduces the service life of the grate and feeder mechanisms. This susceptibility to wear and failure of both the grate and feeder mechanisms results in increased maintenance costs, which in turn leads to undesirable downtime of the entire waste incineration plant.

[0007] From DE 33 01 783 A1 a stepped grate design is known in which side wall plates of a combustion chamber are cooled by an airflow.

[0008] From DE 17 51 706 A a waste incineration furnace with a shaking grate is known, in which the side walls of the waste incineration furnace are also cooled with air.

[0009] From US patent 2013 / 0118469 A1, a hydraulic drive for a sliding grate with water cooling is known.

[0010] The object of the invention is therefore to further minimize the required downtime of a waste incineration plant due to maintenance of the grate mechanism and / or the feeder mechanism, as well as to improve stability.

[0011] This problem is solved by a fire grate according to the features of claim 1, and by a combustion unit with a corresponding fire grate according to claim 7. The dependent claims describe advantageous embodiments of the invention.

[0012] The solution according to the invention provides a fire grate for a waste incineration plant, which has a frame with side walls and torsion shafts rotatably arranged on the frame, which at least partially cover an inner area of ​​the frame, wherein the torsion shafts are operatively connected to a grate mechanism which is configured to rotate the torsion shafts, wherein the grate mechanism is arranged on at least one of the side walls of the frame and at least partially, preferably completely, in an outer area, outside the inner area of ​​the frame. wherein at least one of the side walls of the frame is double-walled, so that an interior space is formed in the at least one side wall, and the frame has inlet openings and outlet openings in the at least one double-walled side wall, in particular at the end faces, so that an airflow can flow through the respective interior space in the at least one double-walled side wall.

[0013] The frame, typically consisting of four side walls, forms the outer boundary of the fire grate. Two of the side walls run essentially perpendicular to the torsion shafts, while the other two run essentially parallel to them. Primary air from a bottom-air chamber is typically drawn through the inner section of the frame, which is bounded by the side walls. This inner section is then exposed to very high temperatures due to the combustion process, while lower temperatures usually prevail in the outer section of the frame.

[0014] The aforementioned torsion shafts, for example, form the grate rollers in the case of roller grates, while in the case of shear grates, they are designed to drive the grate bars of the shear grate. This rotation of the torsion shafts allows the material to be transported and / or stoked. The torsion shafts are therefore moving parts on the respective fire grate, typically located near the high combustion temperatures during the operation of the waste incineration plant. The torsion shafts are movable by the grate mechanism, and this movement transports and / or stokes the material or combustion bed located on the torsion shafts (in the case of a roller grate) or on the grate bars connected to the torsion shafts (in the case of a shear grate). This allows the transport speed of the material to be optimally adapted to the locally varying combustion conditions.The grate mechanism can be formed, for example, by one or more electric and / or hydraulic rotary drives, hydraulic cylinders, or other actuators, which are operatively connected to corresponding mechanical transmission components that transfer the rotary motion to the torsion shafts. This grate mechanism is thus also formed by moving parts on the respective fire grate, which, during operation of the waste incineration plant, are typically located in the lower temperature range, whereby heat transfer from the inner to the outer area can occur via the frame. Advantageously, this heat transfer can be optimized by the resulting airflow.

[0015] The airflow through the openings and the at least one interior space of the double-walled frame can be generated by a chimney effect, or at least one of the inlet or outlet openings can be connected to a blower, with the blower generating the airflow in the respective interior space by drawing in or blowing out air. The inlet and outlet openings can be located at various points on the frame, but advantageously at the end faces. An inlet opening on one end face serves for the entry of air, while an outlet opening on the other end face serves for the exit of air, so that the airflow can develop throughout the entire interior space of the respective double-walled side wall.

[0016] The airflow within the interior of the double-walled frame provides convective cooling, at least in certain areas, thus thermally decoupling the inner section of the frame, defined by the four side walls, from the outer section. This convective cooling can be achieved by using either individual side walls, such as those perpendicular to the torsion shafts (where the grate mechanism is conventionally mounted), or by using all side walls of the frame. The interior spaces of all or some of the side walls can preferably be interconnected to advantageously create a combined airflow.

[0017] This additional thermal decoupling allows the outer grate mechanism to be kept even cooler, thereby minimizing thermal stress on the temperature-sensitive components. This extends the service life of the grate mechanism's components. Furthermore, the airflow within the interior can act as a barrier or purge airflow, removing flammable gases that would otherwise pass through the frame from the inner area to the outer area via the torsion shaft bearings. No additional channels need to be added to the frame for these functions, as the frame itself incorporates these channels. This also has the added benefit of increasing frame rigidity, thus improving the stability of the fire grate.

[0018] The solution according to the invention further provides a combustion unit with a fire grate described above, a blower and a combustion chamber, wherein an airflow can be generated by the blower, which can flow through the respective interior space in the at least one double-walled side wall, wherein the airflow consists of cold boiler room air and this can preferably be directed into the combustion chamber after flowing through the double-walled frame, preferably as secondary air.

[0019] According to one embodiment of the combustion unit, a feeder is further provided for supplying the fire grate with fuel, wherein the feeder has a housing and slides arranged in the housing which are movable via a feeder mechanism, wherein supplied fuel can be pushed onto the fire grate via the slides, wherein at least one inlet opening and one outlet opening are further arranged in the housing, wherein the inlet openings in the housing are flow-connected with the outlet openings in the frame of the fire grates, for example via double-walled air guide struts or other synchronously acting flow connections, so that the airflow generated by the blower from the respective interior space can be introduced into the housing of the feeder in the at least one double-walled side wall of the frame, and preferably subsequently as secondary air and / or primary air further into the combustion chamber.

[0020] The metering mechanism is typically housed within the metering unit's casing, providing additional cooling. This better protects the temperature-sensitive components of the metering mechanism from the high temperatures of the material being fired, thus extending the service life of the metering mechanism's components. The metering mechanism can consist of drive mechanisms and other mechanical components that transmit the drive motion to the slides, such as levers, bearings, etc., which are necessary for moving the slides.

[0021] By using cold boiler room air, also for cooling the fire grates, the overall cooling effect of the airflow is improved, and the airflow is still cold enough at the feeder to provide cooling there. However, as the cold boiler room air is passed through the interior of the double-walled frame and into the feeder housing, it is simultaneously warmed, so that a preheated airflow is directed as secondary air into the combustion chamber behind the feeder, which increases the efficiency of the combustion process.

[0022] Advantageously, the blower is arranged such that the cold boiler room air is drawn through the interior of the double-walled frame and forced into the combustion chamber. In embodiments with a distributor, the blower is advantageously arranged such that the cold boiler room air is drawn through the interior of the double-walled frame and the interior of the distributor housing and then forced into the combustion chamber as secondary or primary air. By using a blower that is part of an existing air system of the waste incineration plant, which, for example, draws in boiler room air and forces it into the combustion chamber as secondary or primary air, synergy effects can be generated, since no additional blower is required.

[0023] The invention will now be explained in more detail using an exemplary embodiment and two figures.

[0024] The figures show: Fig. 1 A combustion unit of a waste incineration plant with fire grates, in particular sliding grates; Fig. 2 a fire grate with grate mechanism of the combustion unit made of Fig. 1 in a detailed view.

[0025] The Fig. Figure 1 shows a combustion unit 1 of a waste incineration plant with three parallel grates 2a, 2b, 2c, each preceded by a feeder section 14a, 14b, 14c of a feeder 14, and a blower 22. The grates 2a, 2b, 2c and the feeder 14 are mounted on a common frame 30. Above the grates 2a, 2b, 2c is a combustion chamber 3 (firebox) in which a material to be combusted (not shown), in particular waste, is incinerated. This material is fed by the feeder sections 14a, 14b, 14c and transported by the grates 2a, 2b, 2c. Primary air from under-air chambers 9 is supplied to the material to be combusted or to the combustion bed from below through the respective grate 2a, 2b, 2c.

[0026] The individual fire grates 2a, 2b, 2c and the individual feeder sections 14a, 14b, 14c are all identical in construction, so that the following descriptions apply equally to all fire grates 2a, 2b, 2c and feeder sections 14a, 14b, 14c. In principle, a different number of fire grates 2a, 2b, 2c, which together serve to transport the material to be fired or the combustion bed through the combustion chamber 3, and feeder sections 14a, 14b, 14c in the feeder 14, which together serve to feed the material to be fired or to supply the fire grates 2a, 2b, 2c with the material to be fired, can also be provided.

[0027] The in Fig. Figure 2, a detailed illustration of a fire grate 2a, has a frame 5 consisting of four side walls 4a, 4b, 4c, 4d and rotatably mounted torsion shafts 6a, 6b, 6c, 6d, the torsion shafts 6a, 6b, 6c, 6d shown being only a selection. The torsion shafts 6a, 6b, 6c, 6d serve to set grate bars (not shown), each connected to one of the torsion shafts 6a, 6b, 6c, 6d via a lever (not shown) and arranged in several rows parallel to each other in the conventional manner, in motion such that the material to be burned or the combustion bed resting on the grate bars is transported and / or stoked.

[0028] As in Fig. As shown in detail in Figure 2, the torsion shafts 6a, 6b, 6c, 6d are operatively connected to a grate mechanism 8 in order to be able to twist the respective torsion shafts 6a, 6b, 6c, 6d.

[0029] The grate mechanism 8 is formed in this case by a hydraulic cylinder 8b, first and second connecting elements 8a, 8c, for example levers, and bearings 8d, wherein two torsion shafts 6a, 6b, 6c, 6d, in particular every second torsion shaft 6a, 6c; 6b, 6d, are coupled to each other via the second connecting elements 8c. Each of the torsion shafts 6a, 6b, 6c, 6d is rotatably connected to the frame 5 on both sides via the bearings 8d.

[0030] Part of the grate mechanism 8 of the fire grate 2a, which is responsible for the rotation of the two coupled torsion shafts 6b, 6d, is arranged on one of the side walls 4b of the frame 5, while another part of the grate mechanism 8, which is responsible for the rotation of two other coupled torsion shafts 6a, 6c of the same fire grate 2a, is attached to the opposite side wall 4d of the frame 5 of the same fire grate 2a. In this way, the grate mechanisms 8, which are assigned to the different coupled torsion shafts 6a, 6c; 6b, 6d, can be distributed on different sides of the fire grate 2a in order to optimize the design effort and space required to drive the grate bars.

[0031] The frame 5 of the fire grate 2a is double-walled, particularly at the side walls 4b, 4d where the grate mechanism 8 is located. The grate mechanism 8 is arranged outside the double-walled frame 5 in an outer region 5b, i.e., outside an inner region 5a of the frame 5, which is specifically bounded by the double-walled side walls 4b, 4d of the frame 5, so that the grate mechanism 8 is not directly exposed to the primary air flowing from the underflow chambers 9. Furthermore, each of the double-walled side walls 4b, 4d has an inlet opening 10a, 10b at an end face 11a, 11b, allowing air L from an environment U, in particular cold air L from the boiler house in which the combustion unit 1 is located, to flow into an interior space 13b, 13d of the respective double-walled side wall 4b, 4d of the frame 5.

[0032] On the end faces 10c, 10d of the respective side walls 4b, 4d opposite the end faces 11a, 11b with the inlet openings 10a, 10b, outlet openings 10c, 10d are also arranged, so that the preferably cold air L from the environment U entering the inlet openings 10a, 10b can also escape from the interior 13b, 13d of the double-walled side walls 4b, 4d through these outlet openings 10c, 10d, so that a cold airflow 12 is formed, which flows through the respective interior 13b, 13d. The other side walls 4a, 4c of the frame 5 can also be double-walled and have inlet / outlet openings 10a, 10b, 10c, 10d, wherein the interior space 13a, 13c in these side walls 4a, 4c can also be flow-connected to the interior space 13b, 13d in the other side walls 4b, 4d, so that a combined airflow 12 can spread through all interior spaces 13a, 13b, 13c, 13d.

[0033] This further thermally decouples the grate mechanism 8 located in the outer area 5b, i.e., the respective hydraulic cylinder 8b, the respective first and second connecting elements 8a, 8c, and the respective bearings 8d, from the inner area 5a of the frame 5, through which the primary air flows from the underflow chambers 9. This prevents the grate mechanism 8 from being affected by the high temperatures of the fuel or the combustion process. Furthermore, if cold air L is drawn in from the boiler house, convective cooling of the grate mechanism 8 can occur. The double-walled side walls 4a, 4b, 4c, 4d also increase the stability of the frame 5.

[0034] Furthermore, a housing 17 is arranged around the feeder 14. This housing has several housing sides 16a, 16b, 16c that define an interior 21 in which the feeder sections 14a, 14b, 14c are located. These housing sides 16a, 16b, 16c can also be double-walled. Each feeder section 14a, 14b, 14c has a feeder mechanism 18, for example, in the form of a hydraulic piston and corresponding mechanical transmission elements, in particular bearings. The feeder mechanism 18 ensures that movable slides 19a, 19b, 19c in the respective feeder section 14a, 14b, 14c are moved and that incoming waste, which is not yet incinerated or partially incinerated, is pushed towards the fire grates 2a, 2b, 2c described above, where it is incinerated.

[0035] The airflow 12 is directed from the outlet openings 10c, 10d of the side walls 4b, 4d of the frame 5 via double-walled air guide struts 23 to inlet openings 20a, 20b of the housing 17. Through these inlet openings 20a, 20b, the airflow 12 is directed, in particular, into the interior 21 of the housing 17. The distribution mechanism 18 arranged in the interior 21 of the housing 17, as well as the movable slides 19a, 19b, 19c, are cooled by this airflow 12. Subsequently, the airflow 12 exits the interior 21 through an outlet opening 20c in the housing 17.

[0036] The airflow 12 through the frame 5 or the double-walled side walls 4a, 4b, 4c, 4d and / or through the housing 17 is preferably generated by the blower 22, which is connected to the outlet opening 20c of the housing 17, for example, via hose connections 25. The blower 22 draws in cold boiler room air as an airflow 12 through the interior of the double-walled frame 5, in particular the double-walled side walls 4b, 4d and optionally also 4a, 4c, and the interior of the housing 17, and then forces this air, for example, into the combustion chamber 3, for example, as secondary air or primary air. Accordingly, a negative pressure is created by the blower 22 above the distributor 14 or the distributor sections 14a, 14b, 14c in order to draw the cold air L located further down in the boiler house through the inlet openings 10a, 10b in the side walls 4b, 4d (and possiblyalso 4a, 4c) to draw in and direct as a convective cooling airflow 12 through the double-walled frame 5 and then into the interior 21 of the housing 17.

[0037] Alternatively or additionally, the blower 22 can also be arranged in front of the inlet openings 10a, 10b of the frame 5, so that the entire airflow 12 is pushed upwards instead of being drawn in from above.

[0038] The advantages of the present invention lie, firstly, in the thermal decoupling or convective cooling of the grate mechanism 8 and the feeder mechanism 18, respectively, which extends the service life of the grate mechanism 8 and the feeder mechanism 18 and therefore reduces the downtime of the entire waste incineration plant; secondly, in the preheating and introduction of the airflow 12 as secondary air into the combustion chamber 3, which increases the efficiency of the combustion process. Furthermore, the double-walled design increases the rigidity and stability of the combustion unit 1. Reference symbol list 1 combustion unit 2a, 2b, 2c Fire grate 3 Combustion chamber 4a, 4b, 4c, 4d Side walls of frame 5 5 frames 5a inner area of ​​the frame 5 5b outer area of ​​the frame 5 6a, 6b, 6c, 6d Torsional wave 8 Rust Mechanics 8a first connecting element 8b Hydraulic cylinder 8c second connecting element 8d bearing 9 Underwind chamber 10a, 10b Entrance opening in the side walls 4b, 4d 10c, 10d Exit opening in the side walls 4b, 4d 11a, 11b, 11c, 11d End faces of the side walls 4b, 4d 12 Airflow 13a, 13b, 13c, 13d Interior in the side walls 4a, 4b, 4c, 4d 14 distributors 14a, 14b, 14c Allocation section 16a, 16b, 16c Case sides of case 17 17 cases 18 Allocation mechanism 19a, 19b, 19c Slider 20a, 20b Entrance opening in housing 17 20c Exit opening in housing 17 21 Interior 22 blowers 23 air guide struts 25 hose connections 30 scaffolding L air U surroundings

Claims

[1] Fire grate (2a, 2b, 2c) for a waste incineration plant, comprising a frame (5) with side walls (4a, 4b, 4c, 4d) and torsion shafts (6a, 6b, 6c, 6d) rotatably mounted on the frame (5), which at least partially cover an inner area (5a) of the frame (5), wherein the torsion shafts (6a, 6b, 6c, 6d) are operatively connected to a grate mechanism (8) which is configured to twist the torsion shafts (6a, 6b, 6c, 6d), wherein the grate mechanism (8) is arranged on at least one of the side walls (4b, 4d) of the frame (5) and is located at least partially, preferably completely, outside the inner area (5a) of the frame (5), characterized by , that at least one of the side walls (4a, 4b, 4c, 4d) of the frame (5) is double-walled, so that an interior space (13a, 13b, 13c, 13d) is formed in the at least one side wall (4a, 4b, 4c, 4d), and the frame (5) has inlet openings (10a, 10b) and outlet openings (10c, 10d) in the at least one double-walled side wall (4a, 4b, 4c, 4d), in particular at the end faces (11a, 11b, 11c, 11d), so that an airflow (12) can flow through the respective interior space (13a, 13b, 13c, 13d) in the at least one double-walled side wall (4a, 4b, 4c, 4d). [2] Fire grate (2a, 2b, 2c) according to claim 1, characterized by , that at least the side walls (4a, 4b, 4c, 4d) of the frame (5) are double-walled, on which the grate mechanism (8) is arranged in the outer area (5b) outside the inner area (5a) of the frame (5). [3] Fire grate (2a, 2b, 2c) according to claim 1 or 2, characterized by, that the grate mechanism (8) comprises a hydraulic unit (8b) and / or connecting elements (8b, 8c), for example levers, for coupled rotation of at least two torsion shafts (6a, 6c; 6b, 6d) and / or bearings (8d) attached to the frame (5) for rotatably bearing the torsion shafts (6a, 6b, 6c, 6d) on the frame (5), wherein at least one of these elements of the grate mechanism (8) is arranged on the side walls (4a, 4b, 4c, 4d) of the frame (5) outside the inner area (5a) of the frame (5). [4] Fire grate (2a, 2b, 2c) according to any one of the preceding claims, characterized by , that the fire grate (2a, 2b, 2c) is part of a roller grate or a push grate, wherein the torsion shafts (6a, 6b, 6c, 6d) form grate rollers of the roller grate or the torsion shafts (6a, 6b, 6c, 6d) are designed to drive grate bars of the push grate, so that by twisting the torsion shafts (6a, 6b, 6c, 6d) a fuel can be transported and / or stoked. [5] Fire grate (2a, 2b, 2c) according to any one of the preceding claims, characterized by , that at least one of the inlet openings (10a, 10b) or at least one of the outlet openings (10c, 10d) is flow-connectable with a connection for connecting a blower (22) for drawing air (L) into the respective interior space (13a, 13b, 13c, 13d) of the at least one double-walled side wall (4a, 4b, 4c, 4d). [6] Fire grate (2a, 2b, 2c, 2d) according to any one of the preceding claims, characterized by , that interior spaces (13a, 13b, 13c, 13d) of different double-walled side walls (4a, 4b, 4c, 4d) are interconnected by flow. [7] Combustion unit (1) for a waste incineration plant, comprising at least a blower (22), a combustion chamber (3) and a fire grate (2a, 2b, 2c), in particular a fire grate (2a, 2b, 2c) according to one of the preceding claims, comprising at least: a frame (5) with side walls (4a, 4b, 4c, 4d) and torsion shafts (6a, 6b, 6c, 6d) rotatably mounted on the frame (5), which at least partially cover an inner area (5a) of the frame (5), wherein the torsion shafts (6a, 6b, 6c, 6d) are operatively connected to a grate mechanism (8) which is configured to twist the torsion shafts (6a, 6b, 6c, 6d), wherein the grate mechanism (8) is arranged on at least one of the side walls (4b, 4d) of the frame (5) and is located at least partially, preferably completely, outside the inner area (5a) of the frame (5), characterized by , that at least one of the side walls (4a, 4b, 4c, 4d) of the frame (5) of the fire grate (2a, 2b, 2c) is double-walled, so that an interior space (13a, 13b, 13c, 13d) is formed in the at least one side wall (4a, 4b, 4c, 4d), and the frame (5) has inlet openings (10a, 10b) and outlet openings (10c, 10d) in the at least one double-walled side wall (4a, 4b, 4c, 4d), in particular at the end faces (11a, 11b, 11c, 11d), so that an airflow (12) generated by the blower (22) can flow through the respective interior space (13a, 13b, 13c, 13d) in the at least one double-walled side wall (4a, 4b, 4c, 4d). [8] Combustion unit (1) according to claim 7, characterized by , that it continues to have a feeder (14) for feeding the fire grate (2a, 2b, 2c) with fuel, wherein the feeder (14) has a housing (17) and slides (19a, 19b, 19c) arranged in the housing (17), which are movable via a feeder mechanism (18), wherein supplied fuel can be pushed onto the fire grate (2a, 2b, 2c) via the slides (19a, 19b, 19c), wherein at least one inlet opening (20a, 20b) and one outlet opening (20c) are arranged in the housing (17), wherein the inlet openings (20a, 20b) in the housing (17) are flow-connected to the outlet openings (10c, 10d) in the frame (5) of the fire grates (2a, 2b, 2c), for example via air guide struts (23), so that the airflow (12) generated by the blower (22) from the respective interior space (13a, 13b, 13c, 13d) can be introduced into the housing (17) of the distributor (14) in the at least one double-walled side wall (4a, 4b, 4c, 4d) of the frame (5). [9] Combustion unit (1) according to claim 7 or 8, characterized by , that the blower (22) is designed to draw in air (L) at least through the respective interior space (13a, 13b, 13c, 13d) in the at least one double-walled side wall (4a, 4b, 4c, 4d) and then direct it into the combustion chamber (3). [10] Combustion unit (1) according to any one of the preceding claims 7 to 9, characterized by, that the blower (22) is part of an existing air intake system of the waste incineration plant.

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