KR20180057638A - Swirl-mixed exhaust gas post-treatment box and system - Google Patents

Abstract

A post-treatment box for treating engine exhaust gas includes first to third chambers, an exhaust gas inlet member and a process fluid inlet member for introducing an exhaust gas stream and an exhaust gas treatment fluid to the first chamber, respectively, and a second chamber And opens into the third chamber. The exhaust gas inlet member is disposed in an orientation such that swirl motion of the exhaust gas stream is generated within the first chamber and the process fluid inlet member is disposed in an orientation such that the process fluid flows into the swirl exhaust gas stream and is mixed therein. The exhaust aftertreatment system includes such a post-treatment box and a treatment fluid injection device.

Description

Swirl-mixed exhaust gas post-treatment box and system

The present invention relates to a post-treatment system for treating exhaust gas discharged from an engine, particularly a diesel engine.

The exhaust gas of the engine contains harmful components. In order to reduce the emission amount of the harmful components in the exhaust gas, on the one hand, an appropriate aftertreatment technique is required to continuously improve and improve the engine technology to suppress the generation of harmful components, and on the other hand, .

For example, selective catalytic reduction (SCR) can be used to reduce the amount of nitrogen oxides (NOx) in the exhaust of diesel engines by more than 50%. A typical SCR module injects a urea aqueous solution into a hot exhaust gas. The urea solution is atomized and evaporated in the exhaust gas stream to produce NH ₃ , which can be used as a reactant. NH ₃ reacts with oxygen and nitrogen oxides with the aid of a catalyst to form harmless carbon dioxide, nitrogen, and water.

According to the prior art, the SCR module is generally assembled to the exhaust pipe of the engine. To increase the rate of evaporation of the urea solution, a static mixer can be placed in the exhaust. The urea solution collides with the static mixer and thereby decomposes to a smaller size that can evaporate faster than the droplets of the urea solution. The static mixer can also generate turbulence in the exhaust tube of a mixture of smaller urea solution droplets and exhaust gases, which in turn leads to rapid evaporation of the urea solution. In order for the urea solution to fully evaporate and react with the nitrogen oxides, the SCR module should be mounted in a sufficiently long position to the tip of the exhaust pipe. This requires a large mounting space.

Boxed SCR modules with reduced length have been developed in recent years. The urea solution and the exhaust gas are mixed in the boxed SCR module along a path that changes several times. However, there is still room for simultaneously optimizing the size and blend of the boxed SCR module.

It is an object of the present invention to provide an exhaust gas aftertreatment system for engine exhaust with reduced size and increased mixing.

To this end, in one aspect, the present invention provides a post-treatment box for treating engine exhaust gas, comprising:

Defining a first chamber, a second chamber beneath the first chamber, and a third chamber beside the second chamber, wherein the second chamber is separated from the first chamber by a separation plate having an opening, and the third chamber is separated from the second chamber by a second A casing separate from the chamber but still in fluid communication with the second chamber;

An exhaust gas inlet member and a process fluid inlet member mounted in the casing for introducing an exhaust gas stream and an exhaust gas treatment fluid into the first chamber, respectively; And

A tubular processing auxiliary element extending through the second chamber and opening into the third chamber;

The exhaust gas inlet member is disposed in an orientation such that swirl motion of the exhaust gas stream is generated within the first chamber;

Processing fluid inlet member is disposed in an orientation such that the exhaust gas treating fluid flows into the swirl exhaust gas stream and is mixed therein.

According to a possible embodiment of the invention, the treatment fluid inflow member defines a spray direction for the first chamber at its opening, the spray direction being directed in a first direction perpendicular to the flow direction of the exhaust gas in front of the treatment fluid inflow member And a second direction component along the flow direction of the exhaust gas in front of the treatment fluid inflow member.

According to a possible embodiment of the present invention, the exhaust gas swirls in the first chamber in multiple layers, and the treatment fluid inflow member is located at a level to face the upper layers of the swirl flow, especially the uppermost layer.

According to a possible embodiment of the present invention, the exhaust gas inlet member and the process fluid inlet member are disposed adjacent to each other, each having a substantially horizontal central axis, and the separator plate is also substantially horizontal.

According to a possible embodiment of the invention, the opening is a circular hole, and the central axis of the exhaust gas inflow member is offset from the center of the opening in the radial direction of the opening.

According to an embodiment of the present invention, both the exhaust gas inflow member and the process fluid inflow member are disposed adjacent to the upper wall of the casing.

According to a possible embodiment of the present invention, the target component comprises NOx, the exhaust gas treating fluid is an aqueous urea solution, and the treatment auxiliary component is a selective catalytic reduction converter in which the catalyst is disposed.

According to a possible embodiment of the invention, the third chamber is separated from the second chamber by an additional separator plate, the additional separator plate having a perforation for forming fluid communication between the third chamber and the second chamber do.

According to a possible embodiment of the invention, the third chamber is arranged next to both the first and second chambers and is separated from the first and second chambers by a further separating plate, And a second portion separating the third chamber from the second chamber and the second portion forming a fluid communication between the third chamber and the second chamber, Lt; / RTI >

According to a possible embodiment of the invention, the separation plate is perpendicular to and connected to the additional separation plate, wherein the first and second portions of the additional separation plate are separated by a connection between the separation plate and the additional separation plate.

According to a possible embodiment of the invention, the additional separating plate is further formed with a first mounting hole in which a part of the processing auxiliary element is supported, and the wall portion of the casing is provided with a second mounting It is formed with a ball.

According to a possible embodiment of the invention, the post-treatment box further comprises a discharge port member connected to the other part of the processing auxiliary element, and a discharge pipe connected to the discharge port member and arranged obliquely from the central axis of the processing auxiliary element .

According to a possible embodiment of the present invention, the post-treatment box further comprises a target component sensor mounted on the discharge port member for sensing the concentration of the target component in the discharge port member.

According to a possible embodiment of the invention, the post-treatment box further comprises a temperature sensor for sensing the temperature of the incoming exhaust gas in the first chamber.

According to a possible embodiment of the invention, the post-treatment box further comprises at least one flow deflector disposed in the first chamber for directing the exhaust gas to form a swirl flow.

In another aspect, the present invention provides an exhaust aftertreatment system comprising a post-treatment box as described above and a treatment fluid injection device that is assembled in a post-treatment box through a treatment fluid inflow member.

According to a possible embodiment of the invention, the treatment fluid injection device comprises a treatment fluid administration module.

According to the present invention, the box design for the exhaust after treatment system is dense. On the other hand, the mixing degree of the exhaust gas treating fluid and the exhaust gas is increased by the swirl motion.

The foregoing and other aspects of the invention will be more fully understood and appreciated from the following detailed description, when read in conjunction with the drawings.
1 is a front cross-sectional view of a post-treatment box according to an embodiment of the present invention.
2 is a partial cutaway plan view of the post-treatment box.
3 is a right side view of the post-treatment box.
4 is a front view of the vertical separation plate of the post-treatment box.
5 is a plan view schematically illustrating the flow of exhaust gas in the swirl mixing chamber of the post-treatment box.
6 is a plan view schematically illustrating the flow of the exhaust gas treating fluid in the swirl mixing chamber.
7 is a vertical view schematically showing the flow of a mixture of exhaust gas and exhaust gas treating fluid in a post-treatment box.

The present invention generally relates to an exhaust gas aftertreatment system for engine exhaust, wherein the exhaust gas aftertreatment system is configured to inject an exhaust gas treatment fluid into the exhaust gas stream, such that the exhaust gas treatment fluid is mixed with the exhaust gas , And acts on the exhaust gas to reduce the amount of at least one target (possibly harmful) component in the exhaust gas.

In the context of this disclosure, the engine may be an internal combustion engine using any type of fuel, such as diesel, gasoline, and natural gas. The target component in the exhaust gas to be reduced may be any component that the exhaust gas treatment fluid can act on. The exhaust gas treatment fluid may be any fluid that may act on the target component to be reduced, for example, by physical and / or chemical reactions. The exhaust gas treating fluid may be in the form of a liquid, a gas, or a mixture thereof, for example, a solution of a solute in a solvent. To achieve or enhance the action of the exhaust gas treatment fluid on the target component, a processing aid element may be provided. The processing aid may provide physical and / or chemical ancillary functions to the mixture of exhaust gas treatment fluids and exhaust gases. For example, the processing aid may be a catalyst, a heating element, a radiation emitter, or the like.

Embodiments of the exhaust aftertreatment system of the present invention primarily include a treatment fluid injector and a post-treatment box. The treatment fluid injector injects the exhaust gas treatment fluid into the post-treatment box, whereby the exhaust gas treatment fluid is mixed with the exhaust gas.

In certain embodiments of the present invention, the exhaust gas treating fluid comprises a reactant capable of chemically reacting with the exhaust gas. In this case, the treatment fluid injector may be a reagent dosing module that injects the reagent into the post-treatment box in a metered manner, so that the reagent is mixed with the exhaust gas, It happens.

More particular embodiments of the exhaust aftertreatment system of the present invention will be described with reference to the drawings. In this embodiment, the exhaust aftertreatment system is configured to reduce nitrogen oxides in the exhaust gas discharged from the engine, particularly the diesel engine. However, it should be understood that the scope of the present invention also encompasses applications for reducing other target components in the exhaust gas discharged from other types of engines.

Figures 1 to 3 illustrate a post-treatment box of the exhaust aftertreatment system of the present invention. The post-treatment box is configured to define an interior space surrounded by the walls, namely the top wall 1a, the bottom wall 1b, the right wall 1c, the left wall 1d, the front wall 1e, and the rear wall 1f And a substantially rectangular parallelepiped casing 1 formed by panels such as metal panels welded to each other. The casing 1 defines a length in the X direction between the right side wall 1c and the left side wall 1d and defines a width in the Y direction between the front wall 1e and the rear wall 1f, 1a and the lower wall 1b in the Z direction. As shown, the X and Y axes are horizontal and the Z axis is vertical. The upper wall 1a, the lower wall 1b and the right wall 1c are substantially flat while the left wall 1d, the front wall 1e and the rear wall 1f bulge outward slightly. Preferably, the front wall 1e and the rear wall 1f each have substantially the same curvature through their length in the X direction.

The internal space is divided into a swirl mixing chamber (first chamber 2), an SCR converter chamber (second chamber 3), and a selective catalytic reduction (SCR) inlet chamber (first chamber 2) by a horizontal separator plate 5 and a vertical separator plate 6 Third chamber 4).

The separation plate 6 extends in the Y-Z plane and is sealingly connected to the top wall 1a and the bottom wall 1b and the front wall 1e and the rear wall 1f. The separation plate 5 extends in the X-Y plane and is connected to the front wall 1e and the rear wall 1f, the right wall 1c, and the separation plate 6.

The separator plate 5 is substantially rectangular with a circular through-hole 7 at the center. At least one rib 8 may be formed around the through hole 7 to increase the strength of the separator plate 5. [ The ribs 8, which are preferably upwardly convex, may form a continuous circle around the through hole 7 or may be in the form of a collection of discrete arcuate segments. In order to prevent any deposition on the region between the ribs 8 and the periphery of the separator plate 5, small holes may be formed in this area through the separator plate 5. Alternatively, there are small gaps between the separator plate 5 and the edges of the front wall 1e and the rear wall 1f, the right wall 1c, and the separator plate 6.

In the illustrated embodiment, the swirl mixing chamber 2, the SCR converter chamber 3, and the SCR inlet chamber 4 each have a substantially rectangular shape in plan view. However, they may each have a different shape, such as circular or elliptical, and may be defined by suitable walls other than those shown.

A substantially tubular SCR converter 9 is disposed in the SCR converter chamber 3 and extends into the SCR inlet chamber 4. [

As shown in Fig. 4, the separation plate 6 has upper and lower portions divided by a connection line, and the separation plate 5 is connected to the separation plate 6 along the connection line. The lower portion is formed with a mounting hole 10 and a plurality of perforations 11 around the mounting hole 10. The perforations 11 may be in the form of holes, slits, slots or any other suitable form. The upper portion has no holes or perforations and separates the swirl mixing chamber 2 relative to the SCR inlet chamber 4 in a substantially sealed manner.

The right side wall 1c is formed with a similar mounting hole aligned with the mounting hole 10. The SCR converter 9 is inserted through two mounting holes and is fixed thereto so that the SCR converter 9 is supported by the right side wall 1c and the separator plate 6 and the center axis of the SCR converter 9 is X Direction. The two mounting holes have substantially the same inner diameter as the outer diameter of the corresponding portion of the SCR converter 9. [ The SCR converter 9 is sealed to the right side wall 1c in the mounting hole. In order to increase the support strength, the right side wall 1c and the separation plate 6 may be respectively formed with flanges at the edges around the mounting holes.

In the X direction, the SCR converter 9 extends through the entire SCR converter chamber 3 and extends to a predetermined length into the SCR inlet chamber 4 at the inner axial end (inlet end). The outflow end portion of the SCR converter 9 is disposed in the right wall 1c or exposed to the outside of the right wall 1c by a small length and the hollow hemispherical outlet opening member 12 is connected to the SCR converter 9). The discharge pipe (13) is connected to the lower portion of the discharge port end member (12). The discharge tube 13 has a central axis that intersects the center axis of the SCR converter 9, but is deflected from it in both the Y and Z directions as shown in Figs. Fluid communication is formed between the SCR converter 9, the discharge port member 12, and the discharge pipe 13.

A catalyst 9a for the SCR reaction is disposed in the SCR converter 9. [ The catalyst 9a starts at the inner axial end of the SCR converter 9 and extends therein in the X direction. Preferably, the catalyst 9a does not reach the outer axial end of the SCR converter 9. The catalyst 9a may be in the form of several tubular segments.

The exhaust gas inflow member 14 is mounted to the front wall 1e to be in fluid communication with the swirl mixing chamber 2 for introducing the exhaust gas stream into the swirl mixing chamber 2 as shown in Figures 2 and 3, do. The mounting position of the exhaust gas inflow member 14 is in the corner area of the front wall 1e between the top wall 1a and the right wall 1c.

The exhaust gas inlet member 14 is disposed horizontally, preferably with a central axis extending substantially in the Y direction so that the exhaust gas stream flows mainly into the swirl mixing chamber 2 in the Y direction. Alternatively, the center axis of the exhaust gas inflow member 14 may be slightly obliquely upward or downward from the Y direction.

The center axis of the exhaust gas inflow member 14 is offset from the center axis of the through hole 7 in the X direction.

By arranging the exhaust gas inflow member 14 in this manner, the exhaust gas flows primarily in the Y direction first when the exhaust gas flows into the outlet member 12 through the exhaust gas, and then flows into the rear wall 1f, 6, and the front wall 1e, and are turned in order. Thus, swirl flow of the exhaust gas is generated in the swirl mixing chamber 2, as schematically indicated by arrows in Figs. 5 and 7. The swirl flow is substantially around the vertical swath axis O passing through the center point of the through-hole 7. As shown in FIG. 7, the exhaust gas swirls in the swirl mixing chamber 2 in multiple layers (multiple turns).

The treatment fluid inflow member 15 is mounted on the right wall 1c so as to be in fluid communication with the swirl mixing chamber 2 to inject an aqueous urea solution (exhaust gas treatment fluid) such as AdBlue into the swirl mixing chamber 2. The mounting position of the treatment fluid inflow member 15 is in the edge area of the right side wall 1c between the top wall 1a and the front wall 1e near the exhaust gas inflow member 14. [ The central axis of the treatment fluid inflow member 15 which is preferably horizontal is higher than the center axis of the discharge pipe 13 so that the opening of the treatment fluid inflow member 15 in the swirl mixing chamber 2, (Rotations), in particular the top layer (rotation).

In addition, the central axis of the treatment fluid inflow member 15 is diagonally deflected from the X direction so as to face the opposite direction of the front wall 1e, so that the urea solution is directed in the flow direction of the exhaust gas in front of the treatment fluid inflow member 15 And is injected into the swirl mixing chamber 2 in the direction of injection having direction components perpendicular to the direction of flow of the exhaust gas.

The exhaust gas inflow member 14 and the process fluid inflow member 15 may be disposed on other positions or other walls of the post-processing box.

By arranging the treatment fluid inflow member 15 in this manner, the urea solution is injected into the discharge port member 12 in an oblique direction with respect to the flow direction of the opposite exhaust gas. As shown schematically by the broken line in Fig. 6, due to the influence of flowing exhaust gas, the droplet of the urea solution is substantially in the region defined between the treatment liquid inflow member 15 and the separation plate 6 and the rear wall 1f Lt; / RTI > Upon collision with the separator plate 6 and the rear wall 1f, some droplets of the urea solution will be broken down into smaller droplets, which will be included in the swirling flow of the exhaust gas, mixed therein and evaporated. The swirl motion in the swirl mixing chamber 2 contributes to an increase in the mixing degree of the treating agent in the exhaust gas. Another portion of the droplet may form a liquid film on the separator plate 6 and the rear wall 1f, which will rapidly evaporate at the high temperature caused by the exhaust gas. The urea solution evaporates and NH ₃ is generated.

To facilitate formation of the swirl motion, flow deflectors may be disposed in the swirl mixing chamber 2.

A temperature sensor may be disposed within the wall of the post-processing box to sense the temperature of the incoming exhaust gas. The temperature can be used to determine and control the metered amount of urea solution.

As shown in FIG. 7, the mixture of NH ₃ and exhaust gas is swirled in the swirl mixing chamber 2 in a multilayered manner, and then flows downward through the through holes 7 of the separator plate 5 in the lowest layer of the swirl flow, Into the SCR converter chamber 3. In the downward flow, there is almost no liquid droplet of urea solution. In the SCR converter chamber 3, the mixture flows around the SCR converter 9 substantially in the X direction toward the bottom of the separator plate 6. Next, the mixture passes through the perforations 11 of the separator plate 6 and enters the SCR inlet chamber 4. In the SCR inlet chamber 4, the mixture is reversed in direction and flows into the SCR converter 9.

In the flow path of the mixture from the swirl mixing chamber 2 to the SCR converter 9, the mixture changes direction several times. Thanks to the swirl motion and subsequent change of direction, the NH ₃ is completely mixed with the exhaust gas to a very high degree. In the SCR converter 9, the homogeneous mixture flows in the X direction, and with the aid of the catalyst 9a, a selective catalytic reduction reaction takes place between NH ₃ and nitrogen oxide and oxygen in the exhaust gas to form carbon dioxide, nitrogen, and water , Which will be discharged from the SCR converter 9 through the discharge pipe 13.

Note that in the illustrated embodiment, the SCR inlet chamber 4 is disposed next to both the swirl mixing chamber 2 and the SCR converter chamber 3. However, in a variation not shown, the SCR inlet chamber 4 may be disposed only on the side of the SCR converter chamber 3. In this case, the separator 6 separates only the SCR inlet chamber 4 and the SCR converter chamber 3, so that it is formed only by the lower portion of the separator plate 6 described above. The space above the SCR inlet chamber 4 can be used to dispose of other components, even the exhaust gas inlet member 14. In another variant, the SCR inlet chamber 4 is arranged next to a part of the entire swirl mixing chamber 2 and the SCR converter chamber 3.

The exhaust aftertreatment system includes a treatment fluid supply module (e.g., a treatment fluid supply module) that can be integrated into the post-treatment box via the treatment fluid inflow member 15 to supply the urea solution to the swirl mixing chamber 2 in a metered manner ).

The NOx sensor boss 16 for mounting the NOx sensor is mounted on the discharge port fitting member 12. [ The NOx sensor boss 16 is preferably located at a position remote from the discharge pipe 13. The NOx sensor can be mounted to the NOx sensor boss 16, the sensing end of which extends into the interior space of the outlet port member 12 to sense the concentration of residual nitrogen oxides in the treated exhaust gas. The concentration of the residual nitrogen oxides in the treated exhaust gas will be used as an indicator for evaluating the performance of the exhaust gas aftertreatment system and some parameters of the aftertreatment box can be adjusted to optimize performance. These parameters are especially:

 The inner diameter of the exhaust gas inflow member 14;

 The shape and size of the swirl mixing chamber 2, in particular the length, width and height of the swirl mixing chamber 2 when it is rectangular;

 The diameter of the through hole 7 of the horizontal separator plate 5;

 The orientation and position of the treatment fluid inflow member (15) relative to the exhaust gas inflow member (14);

 A type of treatment fluid administration module (e.g., using various types of injectors); And

 The eccentricity of the exhaust gas inflow member (14) with respect to the center of the through hole (7).

Various configurations and applications of post-treatment boxes and exhaust aftertreatment systems can be considered by those skilled in the art.

In the post-treatment box of the present invention, the use of the swirl mixing chamber 2 therein eliminates the need for long exhaust pipes (up to 1000 mm unnecessary) for mixing and evaporating the urea solution with the exhaust gas stream.

The SCR converter chamber 3 is also disposed directly below the swirl mixing chamber 2 and the SCR inlet chamber 4 is connected to the side of the SCR converter chamber 3 or to the side of the swirl mixing chamber 2 and the SCR converter chamber 3, Are disposed next to both, thereby forming a dense post-treatment box with a smaller size. The post-treatment box can be easily applied in various types of vehicles or machines equipped with an internal combustion engine.

In addition, the urea solution is completely evaporated before it enters the SCR converter 9 and is mixed in the exhaust gas, so that the selective catalytic reduction reaction in the SCR converter 9 can take place effectively. Therefore, the size, weight, and cost of the SCR converter 9 and the catalyst 9a can be reduced while ensuring the same or better performance. The size of the post-treatment box, especially the swirl mixing chamber 2, depends mainly on the exhaust gas mass flow rate and the desired degree of mixing. The post-treatment box may have a much smaller size than the tube required to mix similar exhaust gas mass flow rates.

In addition, the reagent dosing module may be integrated into the post-treatment box, so that it is not necessary to consider the mounting location of the dosing module on the long exhaust duct.

Further, even if the advanced mixing concept is applied by the swirl mixing chamber 2 in the post-treatment box, and thus there is crystallization in the swirl mixing chamber 2, there is no risk of shutoff of the exhaust pipe.

In addition, the temperature sensor can be placed in the optimal position on the post-treatment box to provide a more accurate upstream temperature of the exhaust gas, leading to more accurate SCR calibration and a reduction in urea consumption.

In addition, the swirl mixing chamber 2 is integrally formed directly in the post-treatment box, thereby eliminating the operation of mounting a separate static mixer in the exhaust pipe according to the prior art.

Although specific implementations have been described, these implementations are provided by way of example only and are not intended to limit the scope of the present invention. The appended claims and the equivalents are intended to cover all modifications, substitutions and alterations that fall within the spirit and scope of the invention.

Claims (15)

A post-treatment box for treating engine exhaust gas,
A second chamber 3 below the first chamber 2 and a third chamber 4 beside the second chamber 3, wherein the second chamber 3 defines a first chamber 2, a third chamber 4 below the first chamber 2, Is separated from the first chamber (2) by a separation plate (5) having an opening (7) and the third chamber (4) is separated from the second chamber (3) (1); < / RTI >
An exhaust gas inflow member (14) and a treatment fluid inflow member (15) mounted on the casing (1) for introducing an exhaust gas stream and an exhaust gas treatment fluid into the first chamber (2), respectively; And
A tubular processing auxiliary element (9) extending through said second chamber (3) and opening into said third chamber (4);
The exhaust gas inlet member (14) is arranged in an orientation such that swirl motion of the exhaust gas stream is generated in the first chamber (2);
Wherein the treatment fluid inflow member (15) is disposed in an orientation such that the exhaust gas treatment fluid flows into the swirl exhaust gas stream and is mixed therein. The method according to claim 1,
The process fluid inflow member (15) defines an injection direction for the first chamber (2) at an opening thereof, the injection direction being perpendicular to a flow direction of the exhaust gas in front of the process fluid inflow member (15) And having a first direction component and a second direction component along the flow direction of the exhaust gas in front of the treatment fluid inflow member (15). The method according to claim 1,
Wherein the exhaust gas swirls in the first chamber (2) in multiple layers and the treatment fluid inflow member (15) is located at a height to face the upper layers of the swirl flow, especially the uppermost layer. 4. The method according to any one of claims 1 to 3,
Wherein the exhaust gas inflow member (14) and the treatment fluid inflow member (15) are disposed adjacent to each other, each having a substantially horizontal central axis, and the separator plate (5) box. 5. The method of claim 4,
Wherein said opening (7) is a circular hole and said central axis of said exhaust gas inlet member (14) is offset from the center of said opening (7) in the radial direction of said opening (7). 6. The method according to any one of claims 1 to 5,
Wherein the exhaust gas inflow member (14) and the treatment fluid inflow member (15) are both disposed adjacent to the upper wall of the casing (1). 7. The method according to any one of claims 1 to 6,
Wherein the target component comprises NOx, the exhaust gas treating fluid is an aqueous urea solution, and the treatment auxiliary component (9) is an optional catalytic reduction converter in which the catalyst (9a) is disposed. 8. The method according to any one of claims 1 to 7,
The third chamber 4 is separated from the second chamber 3 by an additional separation plate 6 and the additional separation plate 6 is connected to the third chamber 4 and the second chamber 3, (11) for forming a fluid communication between the first and second fluid channels. 9. The method according to any one of claims 1 to 8,
The third chamber 4 is disposed next to both the first and second chambers 2 and 3 and is separated from the first and second chambers 2 and 3 by an additional separation plate 6 Wherein said additional separator plate (6) comprises a first part separating said third chamber (4) from said first chamber (2) in a sealing manner and a second part separating said third chamber (4) from said second chamber Wherein the second portion is formed with a perforation (11) for forming a fluid communication between the third chamber (4) and the second chamber (3), the second portion box. 10. The method of claim 9,
Wherein said separator plate (5) is perpendicular to and connected to said additional separator plate (6), said first and second portions of said additional separator plate (6) ). ≪ / RTI > 11. The method according to any one of claims 8 to 10,
Characterized in that the additional separator plate (6) is further formed with a first mounting hole (10) in which a part of the processing auxiliary element (9) is supported and the wall part of the casing (1) And the other part is formed with a second mounting hole to be supported. 12. The method of claim 11,
(12) connected to the other part of the processing auxiliary element (9), and a discharge pipe (12) connected to the discharge port member (12) and arranged obliquely from the central axis of the processing auxiliary element 13). ≪ / RTI > 13. The method of claim 12,
A target component sensor mounted on the discharge port member (12) for sensing a concentration of a target component in the discharge port member (12); And / or
Further comprising a temperature sensor for sensing the temperature of the incoming exhaust gas in the first chamber (2). 14. The method according to any one of claims 1 to 13,
Wherein the post-treatment box further comprises at least one flow deflector disposed in the first chamber (2) for directing the exhaust gas to form the swirl flow. A post-treatment box as claimed in any one of claims 1 to 14; And
And a treatment fluid dispensing device, in particular a treatment fluid dispensing module, which is assembled in the after treatment box via a treatment fluid inflow member (15).

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