JP2016089838A - Exhaust gas catalytic converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a novel exhaust gas catalytic converter.SOLUTION: An exhaust gas catalytic converter 10 has an interface module 11 comprising an inflow port 14 for exhaust gas to be purified and an outflow port 15 for purified exhaust gas, a direction change module 12 changing a direction of exhaust gas to be purified, and exhaust gas purification modules 13 containing a catalyst bodies 27 through which exhaust gas flows for exhaust gas purification. The interface module 11 comprises a radially outer flow channel 16 connected to the inflow port 14 and a radially inner flow channel 17 connected to the outflow port 15. The exhaust gas purification module 13 comprises a radially outer flow channel 20 communicating with the flow channel 16 and a radially inner flow channel 21 communicating with the flow channel 17. The catalyst bodies 27 are provided in the radially inner flow channel 21 of the exhaust gas purification module 13. The direction changing module 12 changes the direction of a flow from the flow channel 20 of the adjacent exhaust gas purification module 13 to the flow channel 21.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an exhaust gas catalytic converter.

  For example, exhaust gas purification using an exhaust gas catalytic converter is increasingly used in large engines such as marine engines. In the past, exhaust gas catalytic converters have been assemblies that are individually adapted to each internal combustion engine. There is a need for an exhaust gas catalytic converter that is not particularly adapted to certain internal combustion engines, but that can be used in combination with different internal combustion engines.

  From the above, the object of the present invention is to make a new type exhaust gas catalytic converter.

  This object is solved by the exhaust gas catalytic converter according to claim 1. According to the invention, the exhaust gas catalytic converter comprises an interface module comprising an inlet for the exhaust gas to be purified and an outlet for the purified exhaust gas; a direction used to redirect the exhaust gas to be purified A conversion module; and at least one exhaust gas purification module provided between the interface module and the direction change module, which houses a catalytic converter body through which the exhaust gas flows in order to purify the exhaust gas. The interface module includes a radially outer flow path through which the exhaust gas to be cleaned flows and is connected to the inlet, and a radially inner flow path through which the purified exhaust gas flows and is connected to the outlet. The exhaust gas purification module has a radius of the interface module A radially outer channel that is aligned with or in communication with the outer channel and a radially inner channel that is aligned with or in communication with the radially inner channel of the interface module. The catalyst body is provided in the radially inner flow path of the exhaust gas purification module; the direction changing module is disposed radially from the radially outer flow path of the exhaust gas purification module adjacent to the exhaust gas purification module. Turn the flow into the flow path.

  The present invention proposes an exhaust gas catalytic converter of modular design comprising an interface module, a direction change module and at least one exhaust gas purification module. Depending on the number of exhaust gas purification modules used, the exhaust gas catalytic converter can be adapted to the respective internal combustion engine. The interface module is used to connect the exhaust gas catalytic converter to each internal combustion engine.

  According to an advantageous further development, the plurality of exhaust gas purification modules are provided between the interface module and the direction change module and are arranged in series in a stack, so that the same exhaust gas is provided. Exhaust gases flow through the catalyst bodies of different exhaust gas purification modules mounted on the purification module in front and back in series. Thereby, an effective multistage exhaust gas purification that can be adapted to each internal combustion engine is possible.

  According to a further advantageous development, the inlet of the interface module and the outlet of the interface module can be connected via a bypass, the bypass valve being integrated in the bypass, the bypass valve being open In, the inlet and outlet are connected, and in the closed state, the inlet and outlet are disconnected. Preferably, a valve is incorporated in the inlet of the interface module, which disconnects the inlet of the interface module from the radially outer flow path of the interface module when the valve is closed and the bypass is open. Thereby, if necessary, it is possible to carry the exhaust gas past the exhaust gas catalytic converter via a bypass. The exhaust gas catalytic converter can be completely disconnected from the exhaust gas stream by means of a valve arranged at the inlet.

  According to a further advantageous development, the interface module further comprises a metering device for ammonia or ammonia precursor material, through which the ammonia or ammonia precursor material is passed to the exhaust gas to be cleaned. Can be introduced. Preferably, ammonia or ammonia precursor material can be introduced into the flow path radially outward of the interface module via the metering device of the interface module. An SCR exhaust catalytic converter that can be adapted to different internal combustion engines can thereby be made available.

  Preferred further developments of the invention result from the dependent claims and the following description. Exemplary embodiments of the present invention are described in more detail using the figures, but are not limited thereto. The following is shown in the figure.

1 is a perspective view of an exhaust gas catalytic converter according to the present invention. 1 is a front view of an exhaust gas catalytic converter according to the present invention. 1 is a side view of an exhaust gas catalytic converter according to the present invention. FIG. 4 is a cross-sectional view of FIG. 3. 1 is a top view of an exhaust gas catalytic converter according to the present invention. It is a perspective view of the exhaust gas purification module of the exhaust gas catalytic converter according to the present invention.

  The present invention relates to an exhaust gas catalytic converter, and in particular to an SCR exhaust gas catalytic converter for a marine internal combustion engine, preferably driven by diesel fuel or heavy oil.

  The exhaust gas catalytic converter 10 according to the present invention includes at least three modules, that is, an interface module 11, a direction changing module 12, and at least one exhaust gas purification module 13 provided between the interface module 11 and the direction changing module 12. With. In the preferred exemplary embodiment shown, a plurality or two exhaust gas purification modules 13 are arranged between the interface module 11 and the direction change module 12 in series in a stack and back and forth or above and below each other. Alternatively, adjacent to each other, the interface module 11 and the direction changing module 12 are provided.

  The interface module 11 is used to connect the exhaust gas catalytic converter 10 to an internal combustion engine and includes an inlet 14 for exhaust gas to be purified and an outlet 15 for purified exhaust gas. In this case, the interface module 11 includes a radially outer channel 16 (see FIG. 4) and a radially inner channel 17. The exhaust gas 16 to be purified flows through the radially outer flow path 16 and is connected to the inlet 14. On the other hand, in the radially inner flow path 17, the purified exhaust gas flows and is connected to the outlet 15. In this case, the interface module 11 comprises a double wall structure of an outer wall 18 and an inner wall 19, the radially outer flow path 16 is defined radially outward by the outer wall 18 and radially inner by the inner wall 19, The radially inner flow path 17 is defined radially outward by the inner wall 19 of the interface module 11.

  Similarly, the exhaust gas purification module 13 includes a double wall structure having a radially outer flow path 20 and a radially inner flow path 21. A radially outer flow path 20 of each exhaust gas purification module 13 is defined radially outward by an outer wall 22 of each exhaust gas purification module 13, and radially defined by an inner wall 23 of each exhaust gas purification module 13. Yes. The radially inner flow paths 21 of the respective exhaust gas purification modules 13 are demarcated radially outward by the respective inner walls 23 of the respective exhaust gas purification modules 13.

  The radially outer flow path 20 of the exhaust gas purification module 13 is aligned with and in communication with the radially outer flow path 16 of the interface module 11, and therefore, starting from the interface module 11, the direction of the turning module 12 Together, a radially outer flow path for the exhaust gas to be purified is formed.

  The radially inner flow path 21 of the exhaust gas purification module 13 is aligned with and in communication with the radially inner flow path 17 of the interface module 11, and therefore, starting from the turning module 12, the direction of the interface module 11. To form together a radially inner flow path for the purified exhaust gas.

  The direction changing module 12 provided in a cascade or stack on the side opposite to the interface module 11 is for changing the direction of the exhaust gas to be purified from the radially outer flow path to the radially inner flow path. The direction change module 12 is used to change the flow from the flow path 20 outside the exhaust gas purification module 13 directly adjacent to the direction change module 12 to the flow path 21 inside the exhaust gas purification module 13.

  The direction changing module 12 includes an outer wall 24 and a bottom wall 25, and a direction changing body 26 that is directed inward toward the adjacent exhaust gas purification module 13 is formed in the region of the bottom wall 25. The diverter 26 is used to redirect the flow.

  In any case, the adjacent module of the interface module 11, the adjacent module of the direction changing module 12, and the adjacent module of the exhaust gas purification module 13 disposed between the interface module 11 and the direction changing module 12 are adjacent to each other. The flanges 34 are connected to each other.

  Each exhaust gas purification module 13 houses a plurality of ceramic catalyst bodies 27 in the regions of the respective flow paths 21 on the radially inner side, and the exhaust gas flows through the ceramic catalyst bodies 27 for exhaust gas purification. These catalyst bodies 27 are also called honeycombs, and each has a plurality of passages through which exhaust gas flows for purification of exhaust gas. In this case, the exhaust gas flows through the catalyst bodies 27 of the exhaust gas purification modules 13 in parallel. On the other hand, the exhaust gas to be washed continuously passes through the catalyst bodies 27 of adjacent or different exhaust gas purification modules 13 or It flows through in series.

  Therefore, each exhaust gas purification module 13 of the exhaust gas catalytic converter 10 forms an exhaust gas purification stage. The number of exhaust gas purification stages can be determined by the number of exhaust gas purification modules 13 arranged in a stack and provided between the interface module 11 and the direction change module 12, so that the exhaust gas catalytic converter 10 can be easily It can be adapted to an internal combustion engine.

  In the preferred exemplary embodiment shown, the inlet 14 of the interface module 11 and the outlet 15 of the interface module 11 can be connected via a bypass 28 and a bypass valve 29 is incorporated in the bypass 28. If the bypass valve 29 is opened by the bypass 28, the exhaust gas can be transported past the exhaust gas catalytic converter 10.

  The actuator 30 can be used to switch the bypass valve 29 between an open state and a closed state, and in particular when the bypass valve 29 is open, the inlet 14 and the outlet 15 are connected. On the other hand, particularly when the bypass valve 29 is closed, the bypass valve 29 disconnects the inlet 14 and the outlet 15 from each other.

  In the illustrated exemplary embodiment, valve 31 is further incorporated into inlet 14 downstream of the branch of bypass 28 and can be switched between an open state and a closed state via actuator 32. . When the bypass 28 is opened and the exhaust gas is carried past the exhaust gas catalytic converter 10, it is completely possible that the exhaust gas flows into the flow path 16 radially outside the interface module 11 of the exhaust gas catalytic converter 10 through the inlet 14. To prevent, the valve 31 can be closed while the bypass valve 28 remains open.

  Preferably, the exhaust gas catalytic converter 10 according to the present invention is an SCR catalytic converter. In this case, the interface module 11 further includes a metering device 33 for ammonia or an ammonia precursor material, and the ammonia or ammonia precursor material is converted into the exhaust gas to be purified through the metering device 33, that is, the interface module 11. Can be introduced into the flow path 16 on the radially outer side. As a result, the exhaust gas to be purified and ammonia or the ammonia precursor substance are already mixed in the flow path 16 on the radially outer side of the interface module 11, and the exhaust gas and ammonia or the ammonia precursor substance are combined with the exhaust gas purification module 13. Exhaust gas purification module, which flows through the radially outer flow path 20 and is turned together in the area of the direction change module 12 and subsequently disposed in the radial inner flow path 21 of the exhaust gas purification module 13. It flows through the thirteen catalyst bodies 27. The purified exhaust gas exits from the radially inner flow path 17 of the interface module 11 and is discharged from the exhaust gas catalytic converter 10 through the outlet 15.

  In the exemplary embodiment shown, the inlet 14 for the exhaust gas to be purified and the metering device 33 for ammonia or ammonia precursor material are each directed to the flow path 16 radially outside the interface module 11. Open in the radial direction. Here, the metering device 33 for ammonia or ammonia precursor material is provided approximately diametrically opposite the inlet 14 in the exemplary embodiment shown.

  Although the exact arrangement of the inlet 14 and metering device 33 relative to the outer wall 18 and their exact arrangement can be changed, the ammonia or ammonia precursor material has already been exhausted in the flow path 16 radially outward of the interface module 11. Designed for optimal mixing with.

  For example, in an internal combustion engine such as a marine diesel engine, such an exhaust gas catalytic converter 10 is preferably used for each cylinder row.

  Obviously, a module configuration for two cylinder rows is also possible within the scope of the invention.

  The radially outer flow path 16 of the interface module 11 and the radially outer flow path 20 of the exhaust gas purification module 13 are the radially inner flow path 17 of the interface module 11 and the radially inner flow path of the exhaust gas purification module 13. The radially outer flow path 16 flows in the opposite direction to the radially inner flow path 17. The direction changing module 12 is used to change the flow from the radially outer flow path 20 of the exhaust gas module 13 directly adjacent to the radially inner flow path 21 of the exhaust gas module 13.

  A dust collector not shown may be incorporated in the turning module 12 to capture contaminants contained in the exhaust gas.

DESCRIPTION OF SYMBOLS 10 Exhaust gas catalytic converter 11 Interface module 12 Direction change module 13 Exhaust gas purification module 14 Inlet 15 Outlet 16 Channel 17 Channel 18 Outer wall 19 Inner wall 20 Channel 21 Channel 22 Outer wall 23 Inner wall 24 Outer wall 25 Bottom wall 26 Direction change device 27 Catalytic converter body 28 Bypass 29 Bypass valve 30 Actuator 31 Valve 32 Actuator 33 Metering device 34 Flange

Claims (8)

Exhaust gas catalytic converter (10), in particular an SCR exhaust gas catalytic converter for an internal combustion engine,
An interface module (11) comprising an inlet (14) for the exhaust gas to be purified and an outlet (15) for the purified exhaust gas;
A redirection module (12) used to redirect the exhaust gas to be purified;
At least one exhaust gas purification module (13) provided between the interface module (11) and the direction changing module (12), which houses a catalyst body (27) through which the exhaust gas flows to purify the exhaust gas; ,
Have
The interface module (11) includes a radially outer flow path (16) through which exhaust gas to be purified flows and is connected to the inlet (14), and a flow of purified exhaust gas through the outlet ( 15) a radially inner flow path (17) connected to
The exhaust gas purification module (13) or each exhaust gas purification module (13) is aligned with or communicates with the radially outer flow path (16) of the interface module (11). ) And a radially inner flow path (21) that is aligned with or communicates with the radially inner flow path (17) of the interface module (11), and the exhaust gas purification module (13) ) Or the catalyst body (27) is provided in the radially inner flow path (21) of each exhaust gas purification module (13),
The direction changing module (12) is arranged such that the radially inner flow path (21) of the exhaust gas purification module (13) from the radially outer flow path (20) of the exhaust gas purification module (13) adjacent thereto. An exhaust gas catalytic converter characterized by redirecting the flow to   The exhaust gas catalytic converter according to claim 1, wherein the exhaust gas purification module (13) or each exhaust gas purification module (13) contains a plurality of catalyst bodies (27) through which exhaust gas flows in parallel.   A stack is formed between the interface module (11) and the direction changing module (12) so that the exhaust gas flows back and forth through the catalyst bodies (27) of different exhaust gas purification modules (13) in series. The exhaust gas catalytic converter according to claim 1 or 2, wherein a plurality of exhaust gas purification modules (13) arranged in series in front and back are provided.   The exhaust gas catalytic converter according to any one of claims 1 to 3, wherein the direction change module (12) includes a direction change body (26) on a bottom wall (25).   The inlet (14) of the interface module (11) and the outlet (15) of the interface module (11) can be connected via a bypass (28), and in the bypass (28) A bypass valve (29) is incorporated, and the bypass valve (29) connects the inlet (14) and the outlet (15) in the open state, and in the closed state, the inlet (14) and the outlet (15). The exhaust gas catalytic converter according to any one of claims 1 to 4, wherein the connection to (15) is released.   If the valve (31) is incorporated in the inlet (14) of the interface module (11), and the valve (31) is closed and the bypass (28) is open, the interface module (11) 6. The exhaust gas catalytic converter according to claim 5, wherein the inflow port is disconnected from the radially outer flow path of the interface module. 11.   The interface module (11) further comprises a metering device (33) for ammonia or ammonia precursor material, through which the ammonia or ammonia precursor material is converted into exhaust gas to be purified. The exhaust gas catalytic converter according to any one of claims 1 to 6, wherein the exhaust gas catalytic converter can be introduced.   Ammonia or an ammonia precursor substance can be introduced into the radially outer flow path (16) of the interface module (11) via the metering device (33) of the interface module (11). The exhaust gas catalytic converter according to claim 7.

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