阅读说明：本技术 用于排气后处理的装置 (device for exhaust gas aftertreatment ) 是由 B·范登赫维尔 R·弗里奇 B·P·卡波里 于 2019-06-06 设计创作，主要内容包括：本发明涉及一种用于排气后处理的装置(1),该装置包括第一催化转化器设备(2)和沿排气的流动方向(17、18)上邻接第一催化转化器设备(2)的第二催化转化器设备(3),第一和第二催化转化器设备以空间上彼此邻接的方式布置。第一催化转化器设备(2)包括第一流道(11)和第二流道(12),并且第一催化转化器设备(2)被配置为在第一流动方向(17)上引导排气经过第一流道(11),然后在与第一流动方向相反的第二流动方向(18)上引导排气经过第二流道(12)。第二催化转化器设备(3)包括第三流道(13),第二流道(12)在空间上和流体上布置在第一流道(11)与第三流道(13)之间,并且第二催化转化器设备(3)被配置为在排气已离开第二流道(12)之后在与第二流动方向相反的第三流动方向(19)上引导排气经过第三流道(13)。第二流道(12)包括用于喷射还原剂的装置(8)。(The invention relates to an arrangement (1) for the aftertreatment of exhaust gases, comprising a first catalytic converter device (2) and a second catalytic converter device (3) adjoining the first catalytic converter device (2) in the flow direction (17, 18) of the exhaust gases, the first and second catalytic converter devices being arranged in a spatially adjoining manner to one another. The first catalytic converter device (2) comprises a first flow channel (11) and a second flow channel (12), and the first catalytic converter device (2) is configured to direct exhaust gas through the first flow channel (11) in a first flow direction (17) and then through the second flow channel (12) in a second flow direction (18) opposite to the first flow direction. The second catalytic converter device (3) comprises a third flow channel (13), the second flow channel (12) being spatially and fluidly arranged between the first flow channel (11) and the third flow channel (13), and the second catalytic converter device (3) is configured to guide exhaust gas through the third flow channel (13) in a third flow direction (19) opposite to the second flow direction after the exhaust gas has left the second flow channel (12). The second flow channel (12) comprises means (8) for injecting a reducing agent.)

1. An arrangement (1) for exhaust gas aftertreatment, comprising a first catalytic converter device (2) and a second catalytic converter device (3) adjoining the first catalytic converter device (2) in a flow direction (17, 18) of the exhaust gas, the first and second catalytic converter devices being arranged in a spatially adjoining manner to each other, the first catalytic converter device (2) comprising a first flow channel (11) and a second flow channel (12), and the first catalytic converter device (2) being configured to guide the exhaust gas through the first flow channel (11) in a first flow direction (17) and then through the second flow channel (12) in a second flow direction (18) opposite to the first flow direction, the second catalytic converter device (3) comprising a third flow channel (13), the first catalytic converter device (13) comprising a first flow channel (11) and a second flow channel (12), the second flow channel (13) of the first catalytic converter device (2) being spatially and fluidly arranged between the first flow channel (11) and the third flow channel (13), and the second catalytic converter device (3) being configured to guide exhaust gases through the third flow channel (13) in a third flow direction (19) opposite to the second flow direction after the exhaust gases have left the second flow channel (12),

wherein the content of the first and second substances,

The second flow channel (12) of the first catalytic converter device (2) comprises means (8) for injecting a reducing agent.

2. The device (1) as claimed in claim 1,

Wherein the content of the first and second substances,

The second flow channel (12) of the first catalytic converter device (2) comprises means (9) for mixing a reducing agent and exhaust gases.

3. The device (1) of claim 1 or claim 2,

wherein the content of the first and second substances,

The first flow channel (11) comprises an exhaust gas outlet (25), the third flow channel (12) comprises an exhaust gas inlet (6), and the second flow channel (12) comprises a first end (10) and a second end (20), the first end (10) being arranged at the exhaust gas outlet (25) of the first flow channel (11), the second end (20) being arranged at the exhaust gas inlet (6) of the third flow channel (13), and the means for injecting (8) and/or the means for mixing (9) being arranged at the first end (10) of the second flow channel (12) or at the second end (20) of the second flow channel (12).

4. The device (1) according to any one of claims 1 to 3,

Wherein the content of the first and second substances,

The third flow channel (13) comprises an exhaust gas inlet (6) and an exhaust gas outlet (7), the exhaust gas inlet (6) being arranged vertically above the exhaust gas outlet (7), and the means for injecting (8) and/or the means for mixing (9) being arranged vertically above the exhaust gas inlet (6) of the third flow channel (13).

5. The device (1) according to any one of claims 1 to 4,

Wherein the content of the first and second substances,

The first flow channel (11) comprises a central axis (14) and/or the second flow channel (12) comprises a central axis (15) and/or the third flow channel (13) comprises a central axis (16), and these central axes each comprise an angle of 0 to 45 degrees.

6. The device (1) according to any one of claims 1 to 5,

Wherein the content of the first and second substances,

The first flow direction (17) and the second flow direction (18) and/or the second flow direction (18) and the third flow direction (19) comprise an angle of 135 to 225 degrees.

7. The device (1) according to any one of claims 1 to 6,

Wherein the content of the first and second substances,

At least one of the catalytic converter devices (2, 3) comprises a diesel particulate filter and/or an SCR catalytic converter and/or a lean NOx trap.

8. The device (1) according to any one of claims 1 to 7,

Wherein the content of the first and second substances,

The second flow channel (12) radially surrounds the first flow channel (11).

9. method of operating a device (1) for the aftertreatment of exhaust gases according to one of claims 1 to 8,

Wherein the content of the first and second substances,

The exhaust gas is conducted into the first flow channel (11) of the first catalytic converter device (2), a reducing agent is injected into the exhaust gas leaving the first flow channel (11) in the region of the second flow channel (12) by means of the means for injecting (8), and the exhaust gas is then conducted into the second catalytic converter device (3).

10. the method of claim 9, wherein the first and second light sources are selected from the group consisting of a red light source, a green light source, and a blue light source,

Wherein the content of the first and second substances,

The exhaust gas is mixed with the injected reducing agent by means (9) for mixing.

11. A motor vehicle (45) comprising an arrangement (1) for exhaust gas aftertreatment according to any one of claims 1 to 8.

Technical Field

The invention relates to a device for exhaust gas aftertreatment, a method for operating a device for exhaust gas aftertreatment and a motor vehicle.

Background

the efficiency of the exhaust gas aftertreatment system is substantially limited, since the exhaust gas flowing into the region of the exhaust gas system arranged downstream of the exhaust gas aftertreatment device still contains unutilized thermal energy. Exhaust aftertreatment systems often require a certain minimum temperature, the so-called light-off temperature, for conversion of the exhaust gas, which further limits efficiency.

furthermore, it is increasingly challenging to install an internal combustion engine in the engine compartment of a motor vehicle. The reason for this is the increasing number of additional components, each with its specific dimensions, which must be assembled with the internal combustion engine. Internal combustion engines in common use today, for example, require components such as turbochargers, exhaust aftertreatment systems, high and low pressure exhaust gas recirculation systems, charge air coolers, heating systems, high temperature-based and low temperature-based cooling systems, etc., for use in core engines, and also for use in various components, various pumps (e.g., oil pumps, fuel pumps, coolant pumps, vacuum pumps), and drive systems. With the demand for ever-improving engine performance and increasingly stringent requirements in terms of emissions, there is a trend toward additional components that are required to occupy increasing space in the engine compartment. In this case, the size of the exhaust aftertreatment system is of particular relevance.

In connection with the aftertreatment of the exhaust gases of motor vehicles, attempts have been made to arrange the respective catalytic converters in a manner that is as space-saving as possible. For this purpose, flow channels with recirculation zones are usually provided. Thus, the exhaust gas flows first in a first flow direction and then turns to a second flow direction opposite the first flow direction. In this way, in compact catalytic converter applications, at least two catalytic converter units or substrates are arranged alongside one another in the most compact space.

the limited storage space and the size of the components mean that it is necessary to mount the exhaust aftertreatment components in such a way that more and more bends are required in the flow path. Furthermore, the catalytic converters must be positioned so that their function is not impaired. For example, the mainly vertical arrangement of a catalytic converter for selective catalytic reduction (SCR catalytic converter) or a corresponding filter (SCRF-selective catalytic conversion filter), through which the flow passes from the bottom upwards, may be susceptible to the formation of deposits (such as ash, soot and converted urea by-products) in its inlet region due to gravity.

Exhaust gas aftertreatment units with a recirculation zone are described, for example, in documents US 8,978,366B 2 and US 2017/218824.

disclosure of Invention

It is an object of the present invention to provide an advantageous device for exhaust gas aftertreatment which reduces the above-mentioned difficulties in connection with a small storage space.

this object is achieved by an apparatus for exhaust-gas aftertreatment according to the invention, a method for operating an apparatus for exhaust-gas aftertreatment according to the invention and a motor vehicle according to the invention. The preferred embodiments comprise further advantageous embodiments of the invention.

The arrangement according to the invention for exhaust gas aftertreatment comprises a first catalytic converter device and a second catalytic converter device adjoining the first catalytic converter device in the flow direction of the exhaust gas. The first catalytic converter device and the second catalytic converter device are arranged in a spatially adjacent manner to each other, for example side by side to each other. The first catalytic converter device includes a first flow passage and a second flow passage. The first catalytic converter device is configured to direct exhaust gas through the first flow passage in a first direction and then through the second flow passage in a second flow direction opposite the first direction. The second catalytic converter apparatus includes a third flow passage. The second flow passage of the first catalytic converter device is spatially and fluidly arranged between the first flow passage of the first catalytic converter device and the third flow passage of the second catalytic converter device. The second catalytic converter device is configured to direct exhaust gas through the second catalytic converter device in a third flow direction opposite the second flow direction after the exhaust gas has left the second flow passage of the first catalytic converter device. For example, the third flow direction may be parallel to the first flow direction.

The arrangement according to the invention for exhaust gas aftertreatment is characterized in that the second flow channel of the first catalytic converter device comprises means for injecting a reducing agent, such as urea or ammonia. The second flow channel of the first catalytic converter device preferably also comprises means for mixing the reducing agent with the exhaust gases. This can be achieved in one device for spraying and for mixing. Thus, a single device for spraying and mixing may be provided.

the device according to the invention has the following advantages: the means for injecting, in particular the means for injecting and/or the means for mixing, may be arranged at a position in the area of the second flow channel which reduces or prevents the formation of deposits of, for example, ash, soot and converted urea species on the walls of the first flow channel and/or the third flow channel. In this respect, the arrangement may in particular be provided in such a way that the effect of gravity is advantageously utilized.

In a preferred variant, the first flow passage comprises an exhaust gas outlet and the third flow passage comprises an exhaust gas inlet. The second flow passage includes a first end and a second end. In this case, the first end portion is disposed at the exhaust gas outlet of the first flow passage, and the second end portion is disposed at the exhaust gas inlet of the third flow passage. In this variant, the means for injecting and/or the means for mixing may be arranged at the first end of the second flow channel or the second end of the second flow channel or at another location of the second flow channel. The arrangement at the second end of the second flow channel, in particular at the exhaust gas inlet of the third flow channel, has the advantage that substances capable of causing deposits are guided through the third flow channel to the exhaust gas outlet of the second catalytic converter device.

The third flow passage advantageously comprises an exhaust gas inlet and an exhaust gas outlet, the exhaust gas inlet being arranged vertically above the exhaust gas outlet. The means for injecting and/or the means for mixing are advantageously arranged vertically above the exhaust gas inlet of the third flow channel. In this embodiment variant, the formation of deposits is minimized by using gravity.

from the viewpoint of efficient use of the available storage space, it may be advantageous in certain configurations for the means for injecting and/or the means for mixing to be arranged at the first end of the second flow channel, in particular at the exhaust gas outlet of the first flow channel.

In connection with the present invention, mutually opposite flow running directions mean that the respective flow channels each comprise a central axis comprising an angle of 135 degrees (135 °) to 180 degrees (180 °), or 0 degrees (0 °) to 45 degrees (45 °). In an advantageous variant, the first flow channel comprises a central axis and/or the second flow channel comprises a central axis and/or the third flow channel comprises a central axis. These central axes may each comprise an angle of 0 degrees (0 °) to 45 degrees (45 °), preferably an angle of 0 degrees (0 °) to 20 degrees (20 °).

The first flow direction and the second flow direction and/or the second flow direction and the third flow direction may include an angle of 135 degrees to 225 degrees. In each case, the central axis may determine the direction of flow in the respective flow channel. For example, a central axis of a first flow passage may determine a first flow direction, a central axis of a second flow passage may determine a second flow direction, and a central axis of a third flow passage may determine a third flow direction.

at least one of the catalytic converter devices may comprise an SCR catalytic converter (e.g. an SCR filter) and/or a Lean NOx Trap (LNT) and/or a diesel particulate filter. Preferably, the first catalytic converter device comprises a lean NOx trap and the second catalytic converter device comprises an SCR catalytic converter.

In a preferred variant, the first catalytic converter device and the second catalytic converter device are arranged in a common housing. The first catalytic converter device may comprise a central axis and the second catalytic converter device may comprise a central axis, which central axes may be parallel to each other. In another variation, the first flow passage of the first catalytic converter apparatus may include a central axis, and the second flow passage may be disposed radially outward of the first flow passage. The second flow channel may in particular radially surround the first flow channel. The advantage of this is that the first flow channel is insulated by the second flow channel.

The device according to the invention is preferably configured for aftertreatment of the exhaust gases of an internal combustion engine, in particular of a motor vehicle. A supercharger (e.g., a turbocharger) and/or an evaporator may be disposed upstream of the first catalytic converter device.

In the context of the method according to the invention for operating an arrangement for exhaust gas aftertreatment as described above, exhaust gas (for example exhaust gas of an internal combustion engine) is guided into a first flow channel of a first catalytic converter device. The reducing agent is injected into the exhaust gas leaving the first flow channel at an exhaust gas outlet in the region of the second flow channel by means for injecting the reducing agent. The exhaust gas is then directed to a second catalytic converter device. In the context of this method, the exhaust gas can be mixed with the injected reducing agent by means of a device for mixing. The method according to the invention has the advantages already described in connection with the device according to the invention. In particular, the formation of undesirable deposits is reduced or avoided by this method.

The motor vehicle according to the invention comprises an arrangement for exhaust gas aftertreatment according to the invention as described above. Which has the characteristics and advantages already mentioned in the relevant part. The motor vehicle may be a passenger car, a truck or a motorcycle.

Drawings

The invention is explained in more detail below on the basis of exemplary embodiments and with reference to the drawings. While the present invention has been particularly shown and described with reference to preferred exemplary embodiments thereof, the present invention is not limited to the disclosed examples, and other variations may be inferred from these examples by those skilled in the art without departing from the scope of the present invention.

fig. 1 schematically shows an arrangement for exhaust gas aftertreatment according to the invention.

Fig. 2 schematically shows a further variant of the device for exhaust gas aftertreatment according to the invention.

Fig. 3 schematically shows a motor vehicle according to the invention.

Detailed Description

fig. 1 and 2 show two variants of a device 1 for exhaust gas aftertreatment according to the invention. The arrangement 1 for exhaust gas aftertreatment according to the invention comprises a first catalytic converter device 2 and a second catalytic converter device 3. The first catalytic converter device 2 comprises an exhaust gas inlet 4 and an exhaust gas outlet 5. The second catalytic converter device 3 comprises an exhaust gas inlet 6 and an exhaust gas outlet 7, which exhaust gas inlet 6 is connected to the exhaust gas outlet 5 of the first catalytic converter device. The exhaust gas inlet 6 of the second catalytic converter device is preferably arranged above the exhaust gas outlet 7 of the second catalytic converter device in the vertical direction.

The first catalytic converter device 2 includes a first flow passage 11 and a second flow passage 12. The second catalytic converter device 3 comprises a third flow channel 13. The second flow passage 12 is arranged downstream of the first flow passage 11. The third flow channel 13 is arranged downstream of the second flow channel 12. The second flow channel 12 is at least partially spatially arranged between the first flow channel 11 and the third flow channel 13. The second flow channel has a first end 10 and a second end 20. Furthermore, the first flow channel 11 comprises an exhaust gas outlet 25 at which the first end 10 of the second flow channel 12 is arranged. The second end 20 of the second flow passage 12 is arranged at the exhaust gas inlet 6 of the third flow passage 13.

The second flow path comprises means 28 for injecting a reducing agent. Furthermore, the flow channel may comprise means 29 for mixing the injected reducing agent with the exhaust gases. In the variant shown in fig. 1, means 8 for injecting a reducing agent and means 9 for mixing the injected reducing agent with the exhaust gases are arranged at the second end 20. An advantage of this arrangement is that substances which are likely to form deposits on the walls are guided by gravity to the exhaust gas outlet 7 of the second catalytic converter device, thus at least reducing the formation of deposits. In the variant shown in fig. 2, means 8 for injecting a reducing agent and means 9 for mixing the injected reducing agent with the exhaust gas are arranged at the first end 10. This has advantages in connection with arrangements in a limited storage space.

the first flow channel 11 includes a central axis 14. The second flow passage 12 includes a central axis 15. The third flow channel 13 includes a central axis 16. In the variant shown, the central axes 14, 15 and 16 are arranged parallel to one another. In the illustrated variant, the second flow channel 12 is arranged radially outside the first flow channel 11. These central axes simultaneously determine the flow direction in the respective flow channels.

Exhaust gas flows through the first flow passage 11 in the flow direction 17. The flow direction 17 is parallel to the central axis 14. The exhaust gas then flows through the second flow passage 12 in the flow direction 18. In this case, the flow direction 18 is parallel to the central axis 15 and opposite to the flow direction 17. In other words, in the variant shown, the flow directions 17 and 18 comprise an angle of 180 °. After having left the second flow channel 12, the exhaust gas flows through the third flow channel 13 in the flow direction 19. In this case, the flow direction 19 is parallel to the central axis 16 and opposite to the flow direction 18. Thus, in the variant shown, the flow directions 18 and 19 comprise an angle of 180 °. Furthermore, in the variant shown, the flow directions 17 and 19 are parallel to one another. Configurations other than this are also possible. It is thus possible for the flow directions 17 and 18 and/or the flow directions 18 and 19 to comprise an angle of between 135 ° and 180 ° in each case.

In the shown variant, the first catalytic converter device 2 may comprise a lean NOx trap and the second catalytic converter device 3 may comprise an SCR filter. Furthermore, in the variant shown, a turbocharger 21 with a compressor 22 and a turbine 23, and an evaporator 24 are arranged upstream of the device 1 for exhaust gas aftertreatment.

In fig. 1 and 2, the central axes 14, 15 and 16 are all arranged vertically. Thus, the flow directions 17 and 19 face the direction of gravity. Different arrangements are also possible.

fig. 3 schematically shows a motor vehicle 45 according to the invention. As mentioned before, the motor vehicle comprises a device 1 for exhaust aftertreatment according to the invention.

List of reference numerals

Device for exhaust gas aftertreatment

2 first catalytic converter device

3 second catalytic converter device

4 exhaust inlet

5 exhaust outlet

6 exhaust inlet

7 exhaust outlet

8 device for injecting a reducing agent

9 device for mixing reducing agent and exhaust gas

10 first end part

11 first flow channel

12 second flow channel

13 third flow channel

14 central axis

15 central axis

16 central axis

17 direction of flow

18 direction of flow

19 direction of flow

20 second end portion

21 turbo charger

22 compressor

23 turbine

24 evaporator

25 exhaust outlet

45 motor vehicle