CN217270403U - An engine exhaust aftertreatment device - Google Patents

Abstract

The utility model discloses an engine exhaust post-treatment device, two DOC oxidation catalytic converters are arranged in parallel in the box body of the engine exhaust post-treatment device, and the air outlet ends of the two DOC oxidation catalytic converters are connected with a DPF diesel engine particle catcher along the direction of air flow; the inside mixer and two SCR catalytic converters that set up in parallel that still are provided with of box, and the end of giving vent to anger of two DPF diesel engine particle trappers is linked together with the inlet end of mixer, and the end of giving vent to anger of mixer all is linked together with the inlet end of two SCR catalytic converters. The exhaust gas discharged by the engine firstly enters two groups of DOC oxidation catalytic converters and DPF diesel particulate traps which are arranged in parallel, then enters two groups of SCR catalytic converters which are arranged in parallel after being mixed by a mixer, and finally is discharged out of a box body of the post-treatment device. The utility model discloses an engine exhaust apparatus can realize ultralow backpressure, reduces the exhaust resistance, and oil consumption reduction improves the thermal efficiency of engine.

Description

An engine exhaust aftertreatment device

technical field

The utility model relates to the technical field of engine parts, in particular to an engine exhaust aftertreatment device.

Background technique

Traditional post-processing boxes currently have box-type, U-shaped, in-line barrel-type and other structures.

In-line barrel type aftertreatment box: the shape of the aftertreatment package presents a "one" shape, the back pressure is high, and the mixer in the aftertreatment package is compact. It is mainly used in light-duty 4L and below diesel National VI engines.

U-shaped post-processing box: The shape and structure of the post-processing package is similar to the letter U. At present, it is mainly used for self-unloading, stirring, traction and other vehicle applications, and the back pressure is lower than that of the in-line structure.

Traditional box-type after-treatment box: The shape and structure are square, mainly used for tractors, trucks and other purposes, and the back pressure is lower than that of the U-shaped structure.

None of the above after-treatment boxes can meet the requirements of ultra-low back pressure. For heavy-duty engines of 13L and above, the back pressure at the calibration point is required to be below 14kpa. The above-mentioned after-treatment boxes cannot meet the requirements, and the exhaust resistance is large, the fuel consumption is high, and the thermal efficiency is high. Low.

SUMMARY OF THE INVENTION

In order to overcome the above defects, the technical problem solved by the present invention is to provide an engine exhaust after-treatment device, which can realize ultra-low back pressure of the engine exhaust after-treatment system, reduce exhaust resistance, reduce fuel consumption, and improve engine exhaust thermal efficiency.

In order to solve the above technical problems, an engine exhaust after-treatment device of the present invention includes a box body, and two DOC oxidation catalysts are arranged in parallel inside the box body, and along the direction of gas flow, two DOC oxidation catalysts The outlet ends of the catalytic converters are all connected with DPF diesel particulate traps; a mixer and two SCR catalytic converters arranged in parallel are also arranged inside the box, and the outlet ends of the two DPF diesel particulate traps are connected to the The inlet end of the mixer is in communication, and the outlet end of the mixer is in communication with the inlet ends of the two SCR catalytic converters.

Further, the box body includes a casing with two ends open, and the two ends of the casing are respectively provided with a first end plate and a second end plate.

Further, the intake ends of the two DOC oxidation catalysts are mounted on the first end plate, and the exhaust ends of the two DPF diesel particulate traps are mounted on the second end plate.

Further, the inlet end of the mixer is installed on the second end plate, the air outlet ends of the two SCR catalytic converters are connected to the second end plate, and the interior of the housing is provided with a mounting plate. plate, the outlet end of the mixer is installed on the installation plate, the air inlet ends of the two SCR catalytic converters are installed on the installation plate, the air duct is installed on the installation plate, the guide The flow hood and the mounting plate form a flow guide cavity, and the gas outlet end of the mixer and the gas outlet ends of the two SCR catalytic converters are all communicated with the flow guide cavity.

Further, a first end cover is provided on the first end plate, the first end cover and the first end plate form an intake cavity, and the intake ends of the two DOC oxidation catalysts are both connected to the other end plates. The air intake chambers are communicated with each other.

Further, a second end cap is provided on the second end plate, and a urea nozzle is provided on the second end cap.

Further, the second end cover and the second end plate form the urea injection chamber, and the inlet end of the mixer and the outlet ends of the two DPF diesel particulate traps are both injected with the urea. cavity is connected.

Further, a third end cover is provided on the second end plate, the third end cover and the second end plate form an exhaust cavity, and the outlet ends of the two SCR catalytic converters are both connected to the The exhaust chamber is connected.

Further, the first end cap and the second end cap are both heart-shaped structures.

Further, the casing is of a split structure, and the casing includes an upper casing and a lower casing that are detachably connected; the lower casing is fixedly connected to the first end plate and the second end plate .

After the above technical solution is adopted, the beneficial effect of the present invention is that two DOC oxidation catalysts are arranged in parallel inside the box of the engine exhaust aftertreatment device. Both are connected with DPF diesel particulate traps; a mixer and two SCR catalytic converters arranged in parallel are also arranged inside the box, and the outlet ends of the two DPF diesel particulate traps are communicated with the intake end of the mixer. The outlet end of the SCR is communicated with the intake end of the two SCR catalytic converters. The exhaust gas from the engine first enters the two groups of DOC oxidation catalysts and DPF diesel particulate traps arranged in parallel, and then enters the two groups of SCR catalytic converters arranged in parallel after being mixed by the mixer, and finally exits the box of the aftertreatment device. The engine exhaust device of the utility model can realize ultra-low back pressure, reduce exhaust resistance, reduce fuel consumption and improve the thermal efficiency of the engine.

Description of drawings

1 is a perspective view of an engine exhaust aftertreatment device of the present invention;

Fig. 2 is a perspective view of another angle of an engine exhaust aftertreatment device of the present invention;

3 is an exploded view of an engine exhaust aftertreatment device of the present invention;

4 is a schematic structural diagram of an engine exhaust aftertreatment device of the present invention;

Fig. 5 is the sectional view at A-A place in Fig. 4;

Fig. 6 is the sectional view at B-B place in Fig. 4;

Fig. 7 is the sectional view at C-C place in Fig. 4;

In the figure, 1. the upper casing; 2. the lower casing; 31, the first DOC oxidation catalyst; 32, the second DOC oxidation catalyst; 41, the first DPF diesel particulate trap; 42, the second DPF diesel particulate Trap; 51, first SCR catalytic converter; 52, second SCR catalytic converter; 6, mixer; 7, first end plate; 8, second end plate; 9, first end cap; 10, first end plate Two end caps; 11, shroud; 12, third end cap; 13, mounting plate; 14, urea nozzle; 151, guide tube one; 152, guide tube two.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

1, 2, and 3 together, an engine exhaust aftertreatment device includes a box body, and two DOC oxidation catalysts are arranged in parallel inside the box body. The outlet ends of the DOC oxidation catalysts are all connected with DPF diesel particulate traps. The DOC oxidation catalyst is connected with the DPF diesel particulate trap through a clamp. A mixer and two SCR catalytic converters arranged in parallel are also arranged inside the box. The outlet ends of the two DPF diesel particulate traps are connected to the inlet end of the mixer, and the outlet end of the mixer is connected to the two SCR catalytic converters. The inlet ends of the converters are all connected.

1 , 4 , 5 , 6 , and 7 together, the box body includes a casing with open ends at both ends, and the two ends of the casing are respectively connected with a first end plate 7 and a second end plate 8 . The casing is preferably a split structure, and the casing includes an upper casing 1 and a lower casing 2 that are detachably connected, and the lower casing 2 is fixedly connected to the first end plate 7 and the second end plate 8 . The upper shell 1 and the lower shell 2 include a three-layer structure. The specific structure of the upper shell 1 and the lower shell 2 is that the inner and outer metal layers are provided with an intermediate thermal insulation layer, and the thermal insulation layer is made of thermal insulation cotton.

The two DOC oxidation catalysts are the first DOC oxidation catalyst 31 and the second DOC oxidation catalyst 32 respectively, and the intake ends of the first DOC oxidation catalyst 31 and the second DOC oxidation catalyst 32 are installed on the first end plate 7 Above, in order to facilitate the entry of gas into the first DOC oxidation catalyst 31 and the second DOC oxidation catalyst 32, a conical guide tube 151 is installed at the intake end of the first DOC oxidation catalyst 31, and the first DOC oxidation catalyst The oxidation catalyst 31 is installed on the first end plate 7 through the guide tube one 151, and a conical guide tube two 152 is installed at the intake end of the second DOC oxidation catalyst 32, and the second DOC oxidation catalyst 32 passes through The second guide tube 152 is installed on the first end plate 7 . The two DPF diesel particulate traps are the first DPF diesel particulate trap 41 and the second DPF diesel particulate trap 42 respectively, and the outlet ends of the first DPF diesel particulate trap 41 and the second DPF diesel particulate trap 42 are both installed on the on the second end plate 8 .

The two SCR catalytic converters are a first SCR catalytic converter 51 and a second SCR catalytic converter 52, respectively. A mounting plate 13 is provided inside the casing, the intake end of the mixer 6 is mounted on the second end plate 8, and the exhaust ends of the first SCR catalytic converter 51 and the second SCR catalytic converter 52 are both connected to the second end plate 8. On the end plate 8, the outlet end of the mixer 6 is mounted on the mounting plate 13, and the intake ends of the first SCR catalytic converter 51 and the second SCR catalytic converter 52 are both mounted on the mounting plate 13, on the mounting plate 13 A shroud 11 is installed. The shroud 11 and the mounting plate 13 form a duct chamber. The outlet end of the mixer 6, the outlet ends of the first SCR catalytic converter 51 and the second SCR catalytic converter 52 are all connected to the duct chamber. connected.

A first end cover 9 is provided on the first end plate 7, the first end cover 9 and the first end plate 7 form an air intake cavity, and an air intake hole is provided on the first end cover 9, and the first DOC oxidation catalyst The intake ends of 31 and the second DOC oxidation catalyst 32 are both communicated with the intake cavity.

A second end cap 10 is provided on the second end plate 8 , and a urea nozzle 14 is provided on the second end cap 10 .

The second end cap 10 and the second end plate 8 form a urea injection chamber, and the urea nozzle 14 injects urea into the urea injection chamber. The intake end of the mixer 6, the first DPF diesel particulate trap 41, and the exhaust end of the second DPF diesel particulate trap 42 are all communicated with the urea injection chamber.

The second end plate 8 is also provided with a third end cover 12 . The third end cover 12 and the second end plate 8 form an exhaust cavity. The third end cover 12 is provided with an exhaust hole. The first SCR catalytic converter 51 and the outlet end of the second SCR catalytic converter 52 are both communicated with the exhaust chamber.

Both the first end cap 9 and the second end cap 10 have a heart-shaped structure.

The engine exhaust aftertreatment device of the present invention further comprises a temperature sensor, a nitrogen and oxygen sensor, a differential pressure sensor, a PM sensor and the like.

The process of using the engine exhaust aftertreatment device of the present invention to process the engine exhaust is described in detail below:

The gas enters into the intake cavity through the air inlet hole on the first end cover 9, passes through the first guide tube 151 and the second guide tube 152, and passes through the first DOC oxidation catalyst 31 and the second DOC oxidation catalyst 32. The intake end enters the first DOC oxidation catalyst 31 and the second DOC oxidation catalyst 32 respectively. Then, the gas in the first DOC oxidation catalyst 31 enters the first DPF diesel particulate trap 41, and the gas in the second DOC oxidation catalyst 32 enters the second DPF diesel particulate trap 42, and passes through the first DPF diesel particulate trap 42. The outlet ends of the DPF diesel particulate trap 41 and the second DPF diesel particulate trap 42 enter the urea injection chamber, and together with the urea injected by the urea nozzle 14 into the urea injection chamber, enter the mixer through the intake end of the mixer 6 6, after being fully mixed by the mixer 6, it enters the interior of the guide cavity through the outlet end of the mixer 6. Then, it enters the first SCR catalytic converter 51 and the second SCR catalytic converter 52 through the intake ends of the first SCR catalytic converter 51 and the second SCR catalytic converter 52 respectively, and passes through the first SCR catalytic converter The gas outlet end of 51 and the gas outlet end of the second SCR catalytic converter 52 enter the exhaust cavity, and are finally discharged through the exhaust hole on the third end cover 12 .

The engine exhaust device of the utility model can realize ultra-low back pressure, reduce exhaust resistance, reduce fuel consumption and improve the thermal efficiency of the engine.

The technical features named with the serial numbers involved in this specification (the first DOC oxidation catalyst, the second DOC oxidation catalyst, the first DPF diesel particulate trap, the second DPF diesel particulate trap, the first SCR catalytic converter , the second SCR catalytic converter, the first end plate, the second end plate, the first end cover, the second end cover, the third end cover, the guide tube one, the guide tube two, etc.), just to distinguish each The technical features do not represent the positional relationship, installation sequence and working sequence among the technical features.

In the description of this specification, it should be understood that the orientation or positional relationship described in "internal" and the like is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or It is implied that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention.

The present utility model is not limited to the above-mentioned specific embodiments, and various transformations made by those of ordinary skill in the art from the above-mentioned concept without creative work all fall within the protection scope of the present utility model.

Claims (10)

1. The engine exhaust aftertreatment device comprises a box body and is characterized in that two DOC oxidation catalysts are arranged in the box body in parallel, and the air outlet ends of the two DOC oxidation catalysts are connected with a DPF diesel particulate trap along the flowing direction of gas; the diesel particulate filter is characterized in that a mixer and two SCR catalytic converters which are connected in parallel are further arranged in the box body, the air outlet ends of the two DPF diesel particulate traps are communicated with the air inlet end of the mixer, and the air outlet end of the mixer is communicated with the air inlet ends of the two SCR catalytic converters.

2. The engine exhaust aftertreatment device of claim 1, wherein the box comprises a housing open at both ends, the housing having a first end plate and a second end plate disposed at both ends of the housing, respectively.

3. The engine exhaust aftertreatment device of claim 2, wherein the inlet ends of two of said DOC oxidation catalysts are mounted to said first end plate and the outlet ends of two of said DPF diesel particulate traps are mounted to said second end plate.

4. The engine exhaust aftertreatment device according to claim 3, wherein an air inlet end of the mixer is mounted on the second end plate, air outlet ends of the two SCR catalytic converters are connected to the second end plate, a mounting plate is disposed inside the housing, the air outlet end of the mixer is mounted on the mounting plate, the air inlet ends of the two SCR catalytic converters are mounted on the mounting plate, a deflector is mounted on the mounting plate, the deflector and the mounting plate form a deflector cavity, and the air outlet end of the mixer and the air outlet ends of the two SCR catalytic converters are communicated with the deflector cavity.

5. The engine exhaust aftertreatment device of claim 4, wherein a first end cap is disposed on the first end plate, the first end cap and the first end plate forming an intake chamber, the intake ends of both DOC oxidation catalysts being in communication with the intake chamber.

6. The engine exhaust aftertreatment device of claim 5, wherein a second end cap is disposed on the second end plate, the second end cap having a urea nozzle disposed thereon.

7. The engine exhaust aftertreatment device of claim 6, wherein the second end cap and the second end plate form a urea injection cavity, and an inlet end of the mixer and outlet ends of the two DPF diesel particulate traps are in communication with the urea injection cavity.

8. The engine exhaust aftertreatment device of claim 7, wherein a third end cap is disposed on the second end plate, the third end cap and the second end plate form an exhaust cavity, and the exhaust ends of the two SCR catalytic converters are communicated with the exhaust cavity.

9. The engine exhaust aftertreatment device of claim 6, wherein the first end cover and the second end cover are each a heart-shaped structure.

10. The engine exhaust aftertreatment device of claim 2, wherein the housing is a split structure comprising an upper housing and a lower housing that are removably coupled; the lower shell is fixedly connected with the first end plate and the second end plate.

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