Housing of a stationary exhaust gas aftertreatment unit, stationary exhaust gas aftertreatment unit, cogeneration unit and use of the housing

Abstract

The invention relates to a housing (1) of a stationary exhaust gas aftertreatment unit (2), the housing comprising: at least one central holding region (3) formed by a frame (4) made of interconnected pipes (5) and a cover (6), wherein the frame (4) forms feet (7) on which the housing (1) can be set down; and also a first flow tank (8) and a second flow tank (9), one on each side of the central holding region (3), which are designed with a curved tank plate (10, 23) and receive a longitudinally open flow pipe (11, 12), wherein a first flow pipe (11) has at least one first flow pipe outlet (13) which faces away from the central holding region (3) and the second flow pipe (12) has at least one second flow pipe outlet (14).

Description

[0001] Housing of a stationary exhaust gas aftertreatment unit, stationary exhaust gas aftertreatment unit, combined heat and power plant and use of the housing

[0002] The invention comprises a housing for a stationary exhaust aftertreatment unit, a stationary exhaust aftertreatment unit, a combined heat and power plant and a use of the housing.

[0003] Stationary exhaust aftertreatment units comprise devices that are permanently installed and operated, i.e., stationary, in a building or fixed on the ground. They are not, for example, integrated into a mobile vehicle or similar. These stationary exhaust aftertreatment units can treat exhaust gases from stationary combustion processes or systems. Stationary exhaust aftertreatment units are used particularly in combined heat and power plants (CHP plants) to treat their exhaust gases and minimize environmental pollution from direct combustion emissions.

[0004] Housings for such stationary exhaust aftertreatment units include inlets and outlets for exhaust streams, as well as areas in which exhaust aftertreatment components are arranged, through which the exhaust gases are routed. A multitude of requirements are placed on the housings and the exhaust aftertreatment units themselves.

[0005] In steady-state combustion processes, high loads are continuously operated to generate the most efficient and sustained power output possible, resulting in a constant power delivery. Exhaust aftertreatment processes can also be optimized under such continuous loads. With such continuous loads, the exhaust aftertreatment components require regular maintenance. In particular, catalysts and catalyst carriers are used, which must be replaced or maintained continuously depending on the extent and duration of the load. Due to the high throughput, large catalysts are used, which require considerable effort to remove or reinstall during replacement or maintenance.

[0006] It is also advantageous to use exhaust systems with minimal losses in stationary combustion processes, because large volumes of exhaust gas flow through the stationary exhaust aftertreatment units. In particular, it is beneficial if a low pressure drop can be achieved in the stationary exhaust aftertreatment units.

[0007] Furthermore, requirements for low noise levels, efficient or uniform catalytic conversion, robust installation, weather resistance and / or a compact design must be met under these high continuous loads.

[0008] Based on this, the object of the invention is to at least partially solve the problems described with reference to the prior art. In particular, it aims to provide a method for maintaining exhaust gas purification components of stationary exhaust aftertreatment units without significant effort. Furthermore, it proposes methods for the particularly efficient and / or extensive catalytic conversion of exhaust gas by a stationary exhaust aftertreatment unit over a long, maintenance-free period. Finally, it aims to present a robust and cost-effective design for an exhaust aftertreatment unit.

[0009] This problem is solved by the features of the independent claims. Further advantageous embodiments of the invention are specified in the dependent claims. It should be noted that features listed individually in the claims can be combined with one another in any technologically meaningful way and define further embodiments of the invention. Furthermore, the features specified in the claims are further specified and explained in the description, which also presents further preferred embodiments of the invention.

[0010] This is achieved by a housing of a stationary exhaust aftertreatment unit, which includes at least one central receiving area formed by a frame of interconnected pipes and a cover, the frame forming feet on which the housing can be placed, and which further includes a first flow tray and a second flow tray, each of which is arranged laterally on the central receiving area, which are designed with a curved tray sheet and accommodate a flow pipe, wherein a first flow pipe has at least one first flow pipe outlet pointing away from the central receiving area and the second flow pipe has at least one second flow pipe outlet.

[0011] The housing can include exhaust aftertreatment equipment. It is possible for the housing to be installed or set up inside a building or enclosure, such as a container. The housing can also be used freestanding without an enclosure. The stationary exhaust aftertreatment unit can be used for stationary combustion processes or systems. For example, exhaust gases from stationary combustion engines can be treated or converted in the stationary exhaust aftertreatment unit. In particular, it is possible to use the stationary exhaust aftertreatment unit for cleaning / converting exhaust gases from a combined heat and power plant. The exhaust aftertreatment system can include several identical or different components / devices to implement various exhaust aftertreatment processes. In particular, catalysts or other components can be integrated into the exhaust aftertreatment unit.Catalyst carrier bodies are incorporated, through which the exhaust gases are catalytically converted, thus reducing pollutant levels in the exhaust gases.

[0012] The central receiving area can accommodate exhaust aftertreatment devices. Exhaust gases can be passed through the central receiving area and, if necessary, temporarily accumulated there for aftertreatment. Exhaust aftertreatment devices can be arranged within the central receiving area so that they are permeable to the exhaust gases. Preferably, the central receiving area has a square, rectangular, or angular cross-section. The central receiving area can be shaped as a rectangular prism or cuboid. Plate-shaped exhaust gas cleaning devices can be arranged side by side within the central receiving area. Exhaust gases can flow through the central receiving area, passing through the plate-shaped exhaust gas cleaning devices sequentially.The central recording area, for example, has a volume of 1 m³. 3 up to 4 m 3 [cubic meters],

[0013] The central intake area is defined by a framework of interconnected pipes and a cover. Specifically, the framework is at least partially formed by horizontal and vertical pipes (e.g., like the struts of a truss or three-dimensional frame) joined together. The shape of the pipes can be selected appropriately, and semi-open profile pipes or similar designs may also be used. The cover can be permanently or reversibly fixed to the framework and close the gaps, thus creating a gas-tight flow channel through the central intake area with a predetermined flow direction. The cover is specifically designed and positioned so that the exhaust gases can only follow a predetermined flow path. This prevents exhaust gases from escaping uncontrollably from the central intake area.

[0014] The housing pipes can be welded, plugged and / or screwed together, so that they can support the entire housing, especially including the exhaust aftertreatment equipment.

[0015] The frame's preferably four feet can be formed by pipe ends extending below the central receiving area and supporting the entire housing. This allows the housing to be placed on the feet.

[0016] The pipes can form a stable central pipe structure (framework) that provides the system's main strength. This allows the housing to be lifted completely and stably by the pipe structure during transport. The frame can also provide options for attaching components such as doors, flow chambers, etc.

[0017] The frame with its pipes allows for simpler pre-assembly and a modular design. It also contributes to a low weight while maintaining high stability of the housing. The housing can be transported pre-assembled, enabling easy on-site assembly. Furthermore, the modular design of the frame allows existing housings to be expanded or enlarged should the need arise for additional stationary exhaust aftertreatment units or a larger volume of exhaust gas. Thus, the housing can be scaled.

[0018] The first and second flow trays can be attached to or (removably) mounted on the central receiving area. It is possible for the first flow tray to be mounted on one (first lateral) side of the central receiving area and the second flow tray on the opposite (second lateral) side of the central receiving area. The first and second flow trays can also be designed and / or mounted as mirror images. Preferably, the first and second flow trays can be attached to the central receiving area in such a way that the housing as a whole is in equilibrium. The frame can have areas where the flow trays can be attached (gas-tight in the connection area), in particular with screw connections.

[0019] In particular, at least one of the flow trays at the central receiving area of ​​the housing can be designed such that it completely covers a lateral extension of the central receiving area or is flush with it. It is possible that exhaust gases are first directed from the first flow tray into the central receiving area and then from the central receiving area into the second flow tray.

[0020] Each flow tray encloses (adjacent to the central intake area) a volume of, for example, 0.2 m³. 3 up to 0.6 m 3 [cubic meters]. The curved trough plates can each have a semicircular shape to deflect exhaust gas flows with as little turbulence as possible when approached radially by the exhaust gases. It is possible that the trough plates form curved lateral ends of the housing. The trough plates can be bent sheets.

[0021] Each flow tube is housed within a flow tray, allowing exhaust gases from an internal combustion engine to enter the first flow tray via a first flow tube and exit the second flow tray via a second flow tube. The flow tubes can serve as inlets and outlets for the exhaust gases to the housing. The flow tubes may incorporate devices for distributing the exhaust gases within the flow trays. The flow tube can be a single piece. It can extend into the flow tray over 40% to 80%, or specifically over 50% and possibly only up to 70% of its axial length, so that, for example, only a pipe stub (at the front) protrudes. The flow tube can run straight along an axis. The flow tubes may be identical in design, but possibly oriented differently relative to the central receiving area.The flow tubes can be arranged essentially parallel to each other and to the lateral sides of the central receiving area.

[0022] The first outlet of the first flow pipe, pointing away from the central receiving area, can be a device for distributing the exhaust gases in the first flow basin. The exhaust gases can initially flow axially in the first flow pipe, then be deflected (approximately 90°) and directed from the first flow pipe through the first outlet into the first flow basin, specifically so that they flow (directly or approximately radially) towards the curved basin sheet. Within the flow basin, the exhaust gases can be guided in such a way that, after impacting the curved basin sheet (around the flow pipe), they are redirected and enter the central receiving area. In particular, the following flow pattern is established on the inlet side:

[0023] a flow through the first flow tube parallel to the side of the central recording area,

[0024] then a flow running away from or against the side of the central intake area through the first flow tube outlet towards the outer first trough plate of the first flow trough, then a wall flow (backwards) along the first trough plate, past or around the first flow tube towards the central intake area, and

[0025] - Outflow from the first flow tray and inflow into the central intake area.

[0026] Simulations and measurements have shown that this method achieves a particularly uniform flow distribution of the exhaust gas and the flow onto the central intake area. It has also been shown that this method allows for a particularly low pressure loss.

[0027] Consequently, a flow pattern is established here in which the exhaust gas is very effectively distributed from the rounded pipe into the angular or rectangular cross-section of the central receiving area. Such a deflection of the exhaust gases has proven particularly advantageous for a uniform distribution within the central receiving area, ensuring that the exhaust gas purification components located therein are completely permeable to flow.

[0028] The second flow pipe outlet of the second flow pipe can be a device for receiving the exhaust gases in the second flow trough.

[0029] It is possible that the second flow pipe outlet is also oriented not towards the central receiving area, but (in the opposite direction) towards the curved trough plate. In this case, the exhaust gases from the central receiving area can be split, flowing over the second flow pipe onto the curved trough plate of the second flow trough, and then directed into the second flow pipe outlet. The exhaust gases can be directed in such a way that, after impacting the curved trough plate, they are diverted and enter the second flow pipe. This variant can be advantageous if mixing of the exiting exhaust gases is desired, for example, to compensate for temperature differences resulting from the catalytic reaction and / or to promote secondary reactions.

[0030] However, it is also possible that the second flow pipe outlet is oriented towards the central intake area, thus allowing the exhaust gases to flow (directly or essentially straight) from the central intake area into the second flow pipe. This variant can be advantageous if a particularly low pressure loss flow is desired.

[0031] It is possible that at least one of the trough plates is circularly curved over an angular range (in the circumferential direction of the flow trough) of 120° to 180°. It is possible that the exhaust gas flows are deflected with minimal turbulence after exiting the flow pipe outlet. It is possible that both trough plates are essentially identical in design.

[0032] The outlet of the flow pipe can extend over an angular range of 120° to 180° of the respective flow pipe. The outlet can be designed as a recess in the pipe wall, extending, for example, over at least 70%, preferably at least 95%, of the length of the flow pipe within the flow tray. Preferably, a single outlet is provided for each flow pipe. The outlet of the flow pipe can be oriented so that it is perfectly aligned with, or even spanned by, the curvature of the flow tray's sheet metal. This ensures that all exhaust gas exiting the flow pipe is directed onto the curved section of the flow tray.It is possible that 40% to 80%, preferably 50% to 70%, of the pipe surface of the respective flow tube is open through the pipe wall recess of the flow tube outlet, thus forming a flowable opening. Depending on its orientation, the second flow tube outlet may extend towards or away from the central receiving area. The angle of the opening may be larger, smaller, or the same as that of the first flow tube outlet. In most applications, the angle should not exceed 270°. In particular, it is possible to select a larger angle than that of the first flow tube outlet if the second flow tube outlet is directly exposed to the flow from the central receiving area.

[0033] It is possible that the pipe wall recess of the flow pipe outlet serves to positively influence the deflection of the gases in order to improve the flow distribution in the flow trough. In particular, the Uniformity Index (Ui) can be improved. Such an index can be measured, for example, at the first flow pipe outlet. Here, it is checked how much of the exhaust gas flowing into the first flow pipe reaches the central receiving area evenly distributed. Thus, it is measured how highly the exhaust gas is distributed across a cross-sectional area of ​​the central receiving area at its inlet. The Uniformity Index (Ui) is measured as a percentage. It is preferred that a Ui of up to 100% be achieved, so that as much of the central receiving area as possible is covered. Measurements have shown that with the embodiment proposed here, a Ui of more than 70% and, in particular, of 80% to 90% can be achieved.In particular, it is possible to influence the Uniformity Index by using different geometries for the flow pipe outlet.

[0034] It is possible that the first flow pipe outlet and / or the second flow pipe outlet is each designed as a (single) rectangular pipe wall recess.

[0035] It is possible that a flow pipe outlet is interrupted by webs (pipe webs) that run circumferentially and / or longitudinally (parallel to the exhaust gas inlet or outlet). It is possible that the flow pipe outlet is divided into separate outlet areas by these webs. It is possible that at least one of the outlet areas is not rectangular, but, for example, round, oval, teardrop-shaped, etc.

[0036] It is possible that the outlet areas in the longitudinal direction of the flow pipe have different shapes and / or that an outlet area in the longitudinal direction has a tapered opening cross-section.

[0037] In particular, measurements have shown that by means of such adjustments to the shape and position of the outlet areas at the first flow pipe outlet, the Ui can be increased from 87% to 90%.

[0038] It is possible that the second flow tube has two opposing second flow tube outlets, namely one towards the central intake area and one away from the central intake area.

[0039] It is possible that the second flow pipe outlet is arranged perpendicular to the longitudinal direction, in particular as an end-face opening of a flow pipe stub. The flow pipe stub with an end-face opening as the second flow pipe outlet has, in particular, a length that is at most 30% of the length of the first flow pipe in the opposite flow trough.

[0040] It is possible that the central intake area has a (non-circular or, in particular, rectangular) opening cross-section to the flow troughs on each side. It is possible that the flow troughs are directly connected to one side of the central intake area. The central intake area can form the opening cross-section over an entire side profile that is formed or framed by the tubes of the frame.

[0041] It is possible for the curved first trough plate to cover the (adjacent) first flow pipe outlet at a constant distance. It is also possible for the distance from the outlet of the first flow pipe to the curved first trough plate to be the same for the exhaust gases. This can be achieved by ensuring that the first flow pipe and the curved first trough plate have the same curvature. It has been shown that this prevents turbulence in the exhaust gas. The flow of the exhaust gas from the first flow pipe to the opening cross-section of the central receiving area can thus be advantageously influenced and controlled.

[0042] It is possible that the curved second tray sheet covers the second flow pipe outlet or the second flow pipe at a constant distance.

[0043] It is possible for the flow tubes to be fixed in the flow trays by means of two mounting collars attached to the frame, forming a fixed-loose mounting. In particular, the flow tubes can be inserted into mounting collars spaced apart and aligned parallel to each other within the flow trays. It has been shown that this method allows the flow tubes to be attached to the flow trays more stably and with greater precision, even under high thermal stress.

[0044] The receiving collar can also be designed as a (straight) sheet metal piece with an opening, the opening essentially corresponding to the contour of the flow tube. The receiving collar can have a straight base edge that can be flush with the frame or a pipe of the frame. Opposite this, the receiving collar can have a curved head that allows for flush (inside) contact with the curved trough sheet. The receiving collar can be detachably and / or materially bonded and / or gas-tightly connected to the frame and the trough sheet. The two receiving collars of a flow trough can form a (front and / or rear) frontal closure of the flow trough.

[0045] In particular, if additional pipes for incoming or outgoing exhaust gas are attached to the flow pipes (adjacent to the outside), such loads can be better distributed and, in particular, evenly transferred to or absorbed by the stable pipe structure of the central receiving area. It is possible to compensate for thermally induced expansion or contraction of the flow pipes during operation. Such changes (especially in the longitudinal direction of the flow pipes) can be compensated for by having fixed and floating bearings in the flow pipes. This means that the flow pipes are not completely rigidly attached to the housing. In particular, one part of each flow pipe can be firmly and directly connected to the frame by a receiving collar. Another part of each flow pipe can simply be inserted into and held in place by the respective flow tray.Thus, the flow pipe is preferably only indirectly, and not rigidly, attached to the frame at a bearing section. The flow pipes preferably have at least one fastening point that allows for adjustments to the external dimensions of the flow pipes.

[0046] It is possible for both flow tubes to project out of the flow troughs and include a connection flange. The connection flange can comprise an end-facing, radially projecting, circumferential pipe section, preferably formed integrally with the flow tube. It is possible for the connection flanges to project outwards at a distance from a front end of the flow troughs with the flow tubes. This provides a mounting point for exhaust pipes through which exhaust gases can be routed to and from the housing.

[0047] It is possible that the flow trays are oriented such that the flow pipes are parallel to a (horizontal) plane formed by the feet. It is also possible that the flow trays are oriented such that the flow pipes are perpendicular to the plane formed by the feet. Preferably, the flow pipes are oriented so that they point away from the feet. A connection flange can be designed such that externally attached exhaust pipes can be fastened via screw, plug, clamp connections, etc. It is possible that the connection flange provides connection points for exhaust pipes so that the exhaust pipes can be attached to it interchangeably. It is possible that the housings or individual parts of one or more housings can be arranged according to a modular principle.The central mounting area can be designed to offer standardized connection options for flow trays and other attachments. It is possible for the central mounting area of ​​the housing to represent a basic module of a modular system, making the system expandable, scalable, and adaptable.

[0048] It is possible to provide several central receiving areas that are arranged adjacent to each other and interconnected. For example, an existing housing can be expanded if there is a higher demand. In this way, one or more additional central receiving areas can be integrated into the existing housing between the (two) flow trays. Central receiving areas can be connected to each other directly or via connecting pieces (detachably).

[0049] The multiple central intake areas can be combined in such a way that the exhaust gas flows through them serially and / or (divided) separately in parallel.

[0050] In a serial arrangement, several central recording areas are provided in a row one behind the other and in the direction of flow between the two (individual) flow trays.

[0051] In a parallel arrangement, several central receiving areas are provided next to each other and perpendicular to the flow direction between the two (individual) flow troughs.

[0052] Both arrangements can also be combined, for example.

[0053] Particularly when a parallel arrangement is provided, it is preferred that a single (first, possibly also a second) flow tube and optionally also a single (first, possibly also a second) flow tray extend over a plurality, in particular all, of adjacent central receiving areas. This enables a central inflow, division of the flow over the receiving areas, separate catalytic treatment, and subsequent central outflow.

[0054] Particularly when a parallel arrangement is provided, it is preferred that a single (first, and optionally also second) flow tube extends over a plurality, in particular all, of adjacent flow trays and over a plurality, in particular all, of adjacent central receiving areas. It is possible that the single flow tube has a plurality of flow tube outlets, with at least one outlet projecting into each flow tray. This allows for a central inflow via separate receiving areas, distribution of the flow across the receiving areas, separate catalytic treatment, and subsequent central outflow.

[0055] A stationary exhaust aftertreatment unit contributes to solving the problem. This unit comprises a housing in which a plurality of plug-in frames are inserted in the central receiving area, each frame itself comprising at least one honeycomb structure. The central receiving area or frame can include plug-in, guide, or locking elements into which the plug-in frames can be inserted. Preferably, the plug-in frames are rectangular or square frames in which honeycomb structures with a plurality of small channels through which the exhaust gas can flow can be arranged. It is possible for the honeycomb structures to be coated with catalytic material. It is preferred that the honeycomb structures are formed with stacked or folded, at least partially corrugated, metal foils or thin sheets.

[0056] It is possible for a single honeycomb core to be arranged in a frame. It is also possible for several square or rectangular honeycomb cores to be arranged in a single frame.

[0057] It is possible that slots are provided in the central receiving area so that the plug-in frames can be inserted into them. It is possible that the plug-in frames can be locked in the slots, so that the honeycomb structures containing the catalytic material are securely fixed during operation. It is possible that the honeycomb structures are sealed against leakage. Preferably, the slots seal the circumferential gaps between the plug-in frames, so that the exhaust gases in the central receiving area can only flow through the honeycomb structures.

[0058] The frames can be positioned via the slots and are easy to replace. Individual frames, along with the honeycomb cores they contain, can be pulled out and replaced.

[0059] It is possible to replace the plug-in frames via a door, flap, or similar feature in the housing or the cover of the central receiving area. Preferably, the door, flap, or similar feature has at least one sealing strip to compensate for thermal expansion.

[0060] It is possible for the housing to incorporate or be thermally coupled to a device, allowing waste heat from the exhaust gases or the catalytic reaction to be utilized in the central receiving area. In particular, it is possible to provide at least one heat exchanger mounted on or (externally) to the housing, enabling the waste heat generated by the flow of exhaust gas to be utilized in the adjacent heat exchanger.

[0061] A combined heat and power plant, comprising the stationary exhaust gas aftertreatment unit described here, contributes in particular to solving the problem, wherein an exhaust gas inflow is connected to the first flow pipe and an exhaust gas outflow to the second flow pipe.

[0062] The proposed housing or stationary exhaust aftertreatment unit further contributes to solving the problem by ensuring a uniform flow distribution and / or efficient catalytic treatment of exhaust gases, particularly in combined heat and power (CHP) plants. A CHP plant is understood to be, in particular, a system consisting essentially of a combustion unit, a (synchronous) generator, and a heat exchanger. The generator, driven by the combustion unit, produces, for example, three-phase alternating current that can be fed into a (public) grid. The combustion unit (and here, in particular, the exhaust aftertreatment unit) releases heat, which is dissipated in the so-called "internal cooling circuit." 1Heat can be successively extracted, particularly from the lubricating oil, engine coolant, and / or exhaust gas, and transferred to a heating system via a heat exchanger. Such a system is also known as a combined heat and power (CHP) system because it utilizes both the mechanical energy (power) generated by the combustion engine and the thermal energy (heat) released when driving the generator.

[0063] The stationary exhaust gas aftertreatment unit, the combined heat and power plant, and the use of the housing offer particular advantages and / or mitigation of the aforementioned problems. The specific advantages and design features described for the housing are applicable and transferable to the described stationary exhaust gas aftertreatment unit, the combined heat and power plant, and vice versa.

[0064] The invention and its technical context are explained in more detail below with reference to six figures. The illustrations are schematic and not intended to demonstrate scale relationships. The explanations relating to individual details of the figures can be extracted and freely combined with information from the preceding description, unless a person skilled in the art would necessarily conclude otherwise, or such a combination is explicitly excluded. The figures schematically show:

[0065] Fig. 1: a representation of a housing of a stationary exhaust aftertreatment unit,

[0066] Fig. 2: a detailed view of a plug-in frame,

[0067] Fig. 3: Sectional view of the housing of the stationary exhaust aftertreatment unit, Fig. 4: a flow diagram of an exhaust gas stream through the housing of the stationary exhaust aftertreatment unit, Fig. 5: a flow diagram of an exhaust gas stream through the housing of the stationary exhaust aftertreatment unit and Fig. 6: a view of the housing of the stationary exhaust aftertreatment unit.

[0068] Fig. 1 shows a representation of a housing 1 of a stationary exhaust aftertreatment unit 2. The housing 1 has a central receiving area 3, which is enclosed by a frame 4 made of pipes 5. The frame 4 also has feet 7 on which the housing 1 stands. The housing 1 is enclosed by a cover 6. For clarity, part of the cover 6 is not shown (in particular, an upper cover and a front cover).

[0069] On the frame 4 of the central receiving area 3, a first flow tray 8 and a second flow tray 9 are attached laterally. Plug-in frames 18 are arranged in the central receiving area 3 and are held between frames 24. A frontal portion of the first flow pipe 11 and the second flow pipe 12, respectively, protrudes from the flow trays 8 and 9. The flow pipes 11 and 12 are each held on the frame 4 by mounting collars 16. The flow pipes 11 and 12 also each have connection flanges 17 to which exhaust pipes can be attached. The flow trays 8 and 9 are each laterally bounded by a first and second curved tray plate 10 and 23, respectively.

[0070] Fig. 2 shows a detailed view of a plug-in frame 18. The plug-in frame 18 has a honeycomb body 19 that extends over the entire cross-sectional area of ​​the plug-in frame 18. The honeycomb body 19 is held in position by the plug-in frame 18.

[0071] Fig. 3 shows a sectional view of the housing 1 of the stationary exhaust aftertreatment unit 2. It can be seen how an exhaust gas flow 21 enters the first flow trough 8 through a first flow pipe outlet 13 via a connecting flange 17 of the first flow pipe 11. In the first flow trough 8, the exhaust gas flow 21 is deflected by the first curved trough plate and flows past the first flow pipe 11 through a rectangular opening 15 into the central receiving area 3.

[0072] In the central intake area 3, the exhaust gas flows through the honeycomb structures 19 of the plug-in frames 18, which are held in the central intake area 3 by the frame 24. The frame 24 seals the transitions between the plug-in frames 18, preventing exhaust gases from escaping from the sides.

[0073] Analogous to the flow into the central receiving area 3, an exhaust gas flow 22 from the rectangular opening cross-section 15 flows through all honeycomb bodies 19 arranged one behind the other into the second flow pipe outlet 14 of the second flow pipe 12 in the second flow trough 9 (not shown here).

[0074] The exhaust gas flow 22 leaves the housing through the connection flange 17 of the second flow pipe 12.

[0075] Fig. 4 shows a flow diagram of an exhaust gas stream through the housing of the stationary exhaust gas aftertreatment unit 2. An exhaust gas inflow 21 from a combined heat and power plant 20 flows via the first flow pipe outlet 13 into the central receiving area 3 and as exhaust gas outflow 22 through the second flow pipe outlet 14 out of the central receiving area 3.

[0076] Fig. 5 shows a flow diagram of an exhaust gas stream through the housing 1 of the stationary exhaust aftertreatment unit 2, in which several (two) central intake areas 3 are connected in parallel. A (single) first flow pipe 11 projects into two first flow basins 8. The first flow pipe 11 is open to each of the first flow basins 8 via two first flow pipe outlets 13. Thus, each of the two first flow basins 8 can be supplied by the single first flow pipe 12, allowing exhaust gas to flow into the respective central intake area 3. A (single) second flow pipe 12 projects into two second flow basins 9. The second flow pipe 12 is open to each of the second flow basins 9 via two second flow pipe outlets 14.Thus, each of the two second flow trays 9 can be connected to the second flow pipe 12, allowing exhaust gas to flow out of the respective central intake area 3. This makes the exhaust aftertreatment unit 2 scalable, such that a plurality of flow trays 8, 9 can be connected by means of extended flow pipes 11, 12 with a plurality of flow pipe outlets 13, 14. Furthermore, a longitudinal direction 26 of the flow pipes 11, 12 is shown.

[0077] Fig. 6 shows a representation of the housing 1 of the stationary exhaust aftertreatment unit 2, in which an exhaust gas inflow 21 flows into the first flow basin 8 via the first flow pipe 11, and an exhaust gas outflow 22 flows out into the second flow basin 9 via the second flow pipe 12 after passing through the central receiving area 3. The figure shows in detail how the exhaust gas flows from the first flow pipe 11 into the first flow basin 8 via the first flow pipe outlet 13. The first flow pipe outlet 13 has webs 25 (formed integrally with the pipe) that extend circumferentially around the first flow pipe 11. In particular, the webs 25 separate sections of the flow pipe outlet 13. These sections of the flow pipe outlet 13 can be angular, but also, for example, round, oval, or teardrop-shaped.

[0078] 1 case

[0079] 2 stationary exhaust aftertreatment unit 3 central intake area

[0080] 4 scaffolding

[0081] 5 pipe

[0082] 6 Cover

[0083] 7 Stand

[0084] 8 first flow tray

[0085] 9 second flow tray

[0086] 10 first curved tub sheet

[0087] 11 first flow tube

[0088] 12 second flow tube

[0089] 13 first flow pipe outlet

[0090] 14 second flow pipe outlet

[0091] 15 rectangular opening cross-section

[0092] 16 mounting collars

[0093] 17 Connection flange

[0094] 18 plug-in frames

[0095] 19 honeycomb bodies

[0096] 20 Combined heat and power plants

[0097] 21 Exhaust gas inflow

[0098] 22 Exhaust gas flow

[0099] 23 second curved tub sheet

[0100] 24 frames

[0101] 25 Bridge

[0102] 26 Longitudinal direction

Claims

Claims 1. Housing (1) of a stationary exhaust aftertreatment unit (2), comprising at least one central receiving area (3) formed with a frame (4) of interconnected pipes (5) and a cover (6), wherein the frame (4) forms feet (7) on which the housing (1) can be placed, and which further comprises a first flow tray (8) and a second flow tray (9), each of which is arranged laterally on the central receiving area (3), which are designed with a curved tray plate (10, 23) and accommodate a flow pipe (11, 12), wherein a first flow pipe (11) has at least one first flow pipe outlet (13) pointing away from the central receiving area (3) and the second flow pipe (12) has at least one second flow pipe outlet (14).

2. Housing according to claim 1, wherein the trough plates (10, 23) are circularly curved at least over an angular range of 120° to 180°.

3. Housing according to claim 1 or 2, wherein the first flow tube outlet (13) extends over an angular range of 120° to 180° of the first flow tube (11).

4. Housing according to one of the preceding claims, wherein the central receiving area (3) has a rectangular opening cross-section (15) to the flow trays (8, 9).

5. Housing according to one of the preceding claims, wherein the curved first trough plate (10) covers the first flow pipe outlet (13) at a constant distance.

6. Housing according to one of the preceding claims, wherein the flow tubes (11, 12) are each fixed in the flow troughs (8, 9) by means of two receiving collars (16) which are attached to the frame (4), and a fixed-loose bearing is formed with the two receiving collars (16).

7. Housing (1) according to one of the preceding claims, wherein the flow tubes (11, 12) both project from the flow troughs (8, 9) towards the same front and comprise a connecting flange (17).

8. Housing (1) according to one of the preceding claims, wherein several central receiving areas (3) are provided which are arranged adjacent to each other and connected to each other.

9. Housing (1) according to claim 8, wherein several central receiving areas (3) are provided in a series one behind the other and in the direction of flow between the two flow trays (8, 9).

10. Housing (1) according to claim 8, wherein several central receiving areas (3) are provided next to each other and transverse to the flow direction between the two flow troughs (8, 9).

11. Housing (1) according to claim 10, wherein a single flow tube (11, 12) and a single flow tray (8, 9) extend over a plurality of adjacent central receiving areas (3).

12. Housing (1) according to claim 10, wherein a single flow tube (11, 12) extends over a plurality of adjacently arranged flow trays (8, 9) and over a plurality of adjacently arranged central receiving areas (3), wherein the single flow tube (11, 12) has several flow tube outlets (13, 14) and at least one flow tube outlet (13, 14) projects into each flow tray (8, 9).

13. Stationary exhaust aftertreatment unit (2) comprising a housing (1) according to one of the preceding claims, wherein a plurality of plug-in frames (18) are inserted in the central receiving area (3), which themselves comprise at least one honeycomb body (19).

14. Combined heat and power plant (20) comprising a stationary exhaust gas aftertreatment unit (2) according to claim 13, wherein an exhaust gas inflow (21) is connected to the first flow pipe (11) and an exhaust gas outflow (22) is connected to the second flow pipe (12).

15. Use of a housing (1) according to one of claims 1 - 12 or a stationary exhaust gas treatment unit (2) according to claim 14 for adjusting a uniform flow distribution and efficient catalytic treatment of exhaust gases, in particular in combined heat and power plants (20).

Images