JP7033000B2 - Exhaust gas aftertreatment system and internal combustion engine - Google Patents

Description

The present invention relates to an exhaust gas aftertreatment system for an internal combustion engine. The present invention also relates to an internal combustion engine including an exhaust gas aftertreatment system.

During a combustion process in a stationary internal combustion engine used, for example in a power plant, and in a combustion process in a non-stationary internal combustion engine used, for example, in a ship, nitrogen oxides are produced, and the nitrogen oxides are typically coal, hard. It occurs when burning fossil fuels containing sulfur, such as coal, brown coal, crude oil, heavy oil, or diesel fuel. Therefore, such an internal combustion engine is provided with an exhaust gas aftertreatment system, and the exhaust gas aftertreatment system functions to purify, particularly denitrify, the exhaust gas emitted from the internal combustion engine.

In order to reduce nitrogen oxides in exhaust gas, so-called SCR catalytic converters are first used in exhaust gas aftertreatment systems known in practice. In the SCR catalytic converter, selective catalytic reduction of nitrogen oxides is carried out, and ammonia (NH ₃ ) is required as a reducing agent for the reduction of nitrogen oxides. For this purpose, ammonia, or an ammonia precursor such as urea, is introduced into the exhaust gas as a liquid upstream of the SCR catalytic converter, and the ammonia or ammonia precursor is mixed with the exhaust gas upstream of the SCR catalytic converter. For this reason, in practice, a mixing path is provided between the introduction of ammonia or ammonia precursor and the SCR catalytic converter.

Exhaust gas aftertreatment known from practice, and exhaust gas aftertreatment, especially reduction of nitrogen oxides, can already be successful using an exhaust gas aftertreatment system including an SCR catalytic converter. There is a need to further improve the system. In particular, there is a demand for efficient exhaust gas aftertreatment in a compact configuration type of such an exhaust gas aftertreatment system.

In view of the above points, it is an object of the present invention to create a new type exhaust gas aftertreatment system for an internal combustion engine and an internal combustion engine provided with such an exhaust gas aftertreatment system.

The above problem is solved by the exhaust gas aftertreatment system of the internal combustion engine according to claim 1. The exhaust gas aftertreatment system according to the present invention preferably has a plurality of blowout devices provided inside the reactor chamber, the blowout device is useful for purifying the SCR catalytic converter, and the blowout device is a SCR catalytic converter. A medium for purifying the SCR catalytic converter can be supplied from a common accumulator extending in a circular shape or a polygonal shape around the circumference and the blowout device. The present invention is based on the recognition that, for example, the SCR catalytic converter of an exhaust gas aftertreatment system of an internal combustion engine operated by heavy oil or residual oil is prone to blockage. That is, in the exhaust gas of such an internal combustion engine, the proportion of ash or soot is high, and the ash or soot may precipitate in the region of the SCR catalytic converter, causing clogging of the SCR catalytic converter. As a countermeasure against this, a blowout device that serves to remove ash and soot from the SCR catalytic converter is provided.

In the prior art, the blowout device is continuously connected to the pressure conduit, and different pressure conditions are formed when the blowout device is activated, depending on the position of the individual blowout device in the supplying compressed air system. This is due to the different volume of gas and the magnitude of the travel length in front of different blowout devices, which results in different pressure reductions and / or different pressure rises in the case of different pressure reductions and / or reverse waves. As a result, significantly different purification actions are realized via the blowout device.

On the other hand, in the present invention, the medium for purifying the SCR catalytic converter can be uniformly supplied to the blowout device from a common annular or polygonal accumulator. Due to this symmetrical configuration, the pressure reduction and rise are approximately the same for all blowout devices, whereby the blowout device achieves the same purification action. This is particularly advantageous for removing ash and soot from the SCR catalytic converter.

Preferably, a supply conduit extends from a common accumulator to the individual blowout devices, and the individual blowout devices can be supplied with a medium for purifying the SCR catalytic converter through the supply conduits. Preferably, each supply conduit is provided with a switchable valve. A medium for easily and reliably purifying the SCR catalytic converter for all blowout devices, starting from a common circular or polygonal accumulator and through a supply conduit extending to the individual blowout devices. Can be supplied, and also can be supplied while ensuring that the pressure reduction is uniform within the individual blowout device regions.

According to one advantageous evolutionary configuration, a common accumulator extends outside the reactor chamber around the reactor chamber, with individual supply conduits starting from the accumulator and penetrating the walls of the reactor chamber. It extends to the blowing device. When a common accumulator also extends around the reactor chamber, the accumulator is located outside the original reactor chamber, at which time the supply conduit extends through the walls of the reactor chamber. , Thereby supplying a medium for purifying the SCR catalytic converter to the blowout device provided in the reactor chamber.

According to one advantageous evolutionary configuration, the common accumulator, in a circumferentially closed state, extends around the SCR catalytic converter, and preferably around the blowout device located in the reactor chamber. The common accumulator is preferably formed as a circular or polygonal tube, which is closed in the circumferential direction, around the SCR catalytic converter, around the blowout device located in the reactor chamber. , And preferably in a circumferentially closed state, extending around the reactor chamber. Through a pressure accumulator that is closed in the circumferential direction, that is, uninterrupted in any circumferential position, all blowout devices are particularly advantageously supplied with a medium for purifying the SCR catalytic converter.

The internal combustion engine according to the present invention is defined in claim 9.

Suitable evolutionary configurations of the invention are described in the dependent claims and the detailed description below. The embodiments of the present invention will be described in more detail with reference to the drawings, but the present invention is not limited to the embodiments. The drawings show the following.

It is a schematic perspective view of the internal combustion engine provided with the exhaust gas aftertreatment system which concerns on this invention. It is a figure which shows the detail of the exhaust gas aftertreatment system of FIG. It is a figure which shows the detail of the exhaust gas aftertreatment system which concerns on this invention. It is a figure which shows the detail of the change form of the exhaust gas aftertreatment system which concerns on this invention.

The present invention relates to an exhaust gas aftertreatment system for an internal combustion engine, for example a stationary internal combustion engine in a power plant, or a non-stationary internal combustion engine used in a ship. In particular, the exhaust gas aftertreatment system is used in a diesel internal combustion engine for ships operated by heavy oil.

FIG. 1 shows a structure including an internal combustion engine 1 including an exhaust gas turbine supercharging system 2 and an exhaust gas aftertreatment system 3. The internal combustion engine 1 may be a non-stationary internal combustion engine or a stationary internal combustion engine, and may be a marine internal combustion engine particularly operated in a non-stationary manner. The exhaust gas discharged from the cylinder of the internal combustion engine 1 is used in the exhaust gas supercharging system 2, whereby mechanical energy for compressing the supercharged air to be supplied to the internal combustion engine 1 is obtained from the thermal energy of the exhaust gas.

FIG. 1 shows an internal combustion engine 1 including an exhaust gas turbine supercharging system 2 in this way, and the exhaust gas turbine supercharging system has a plurality of turbochargers, that is, a first high-pressure side turbocharger 4 and a second low-pressure side. Includes turbocharger 5 and. The exhaust gas discharged from the cylinder of the internal combustion engine 1 first flows through the high-pressure turbine 6 of the first turbocharger 1, expands in the high-pressure turbine, and the energy obtained at this time is the high pressure of the first turbocharger 4. Used in the compressor, thereby compressing the supercharged air. A second turbocharger 5 is provided downstream of the first turbocharger 4 in the flow direction of the exhaust gas, and the high-pressure turbine 6 of the first turbocharger 4 has already passed through the second turbocharger. The exhaust gas flowing through the turbocharger 5 is guided, that is, guided through the low pressure turbine 7 of the second turbocharger 5. In the low pressure turbine 7 of the second turbocharger 5, the exhaust gas is further expanded, and the energy obtained at this time is used in the low pressure compressor of the second turbocharger 5, thereby supplying the cylinder of the internal combustion engine 1 as well. Compress the supercharged air that should be.

In addition to the exhaust gas supercharging system 2 having two turbochargers 4 and 5, the internal combustion engine 1 includes an exhaust gas aftertreatment system 3, which is an SCR exhaust gas aftertreatment system. The SCR exhaust gas aftertreatment system 3 is preferably interposed between the high pressure turbine 6 of the first compressor 5 and the low pressure turbine 7 of the second turbocharger 5, and thus the high pressure turbine of the first turbocharger 4. The exhaust gas exiting 6 can be guided first through the SCR exhaust gas aftertreatment system 3 before the exhaust gas reaches the region of the low pressure turbine 7 of the second turbocharger 5.

FIG. 1 shows an exhaust gas supply conduit 8, through which the exhaust gas is discharged to an SCR catalytic converter 9 provided in the reactor chamber 10 starting from the high-pressure turbine 6 of the first turbocharger 4. Can be guided towards.

FIG. 1 also shows an exhaust gas discharge conduit 11, which serves to discharge exhaust gas from the SCR catalytic converter 9 toward the low pressure turbine 7 of the second turbocharger 5. The exhaust gas flows from the low pressure turbine 7 to the outside through the conduit 21 in particular.

The exhaust gas supply conduit 8 leading to the reactor chamber 10 and leading to the SCR catalytic converter 9 arranged in the reactor chamber 10 and the exhaust gas exhaust conduit 11 exiting the reactor chamber 10 and exiting from the SCR catalytic converter 9 are bypassed. It is connected via 12, and the blocking organ 13 is incorporated in the bypass. When the blocking organ 13 is closed, the bypass 12 is closed so that no exhaust gas can flow through the bypass. On the other hand, when the blocking organ 13 is open, the exhaust gas can flow through the bypass 12 and pass through the reactor chamber 10 and thus through the SCR catalytic converter 9 arranged in the reactor chamber 10. Can flow. FIG. 2 shows the flow of exhaust gas passing through the exhaust gas aftertreatment system 3 when the bypass 12 is closed via the blocking organ 13 by the arrow 14, and the exhaust gas supply conduit 8 is on the downstream side from FIG. The end 15 of the exhaust gas is found to have an outlet in the reactor chamber 10 and the exhaust gas diverts the flow within the region of the end 15 of the exhaust gas supply conduit 8 at approximately 180 ° or approximately 180 °. The exhaust gas is being guided via the SCR catalytic converter 9 after the flow is redirected.

An introduction device 16 is arranged in the exhaust gas supply conduit 8 of the exhaust gas aftertreatment system 3, and a reducing agent, particularly ammonia or an ammonia precursor, can be introduced into the exhaust gas flow through the introduction device, and the ammonia or the ammonia precursor can be introduced. The material is required to deterministically replace the nitrogen oxides in the exhaust gas within the region of the SCR catalytic converter 9. The introduction device 16 of the exhaust gas aftertreatment system 3 may be preferably an injection nozzle, and ammonia or an ammonia precursor is injected into the exhaust gas flow inside the exhaust gas supply conduit 8 through the injection nozzle. FIG. 2 reveals that the cone 17 injects the reducing agent into the exhaust gas flow in the region of the exhaust gas supply conduit 8.

The path of the exhaust gas aftertreatment system 3 downstream of the introduction device 16 and upstream of the SCR catalytic converter 9 when viewed in the flow direction of the exhaust gas is referred to as a mixing path. In particular, the exhaust gas supply conduit 8 downstream of the introduction device 16 provides a mixing path 18 in which the exhaust gas can be mixed with the reducing agent upstream of the SCR catalytic converter 9.

The exhaust gas supply conduit 8 has an outlet in the reactor chamber 10 by a downstream end 15. A baffle element 20 is provided for the downstream end 15 of the exhaust gas supply conduit 8, and the baffle element can be repositioned with respect to the downstream end 15 of the exhaust gas supply conduit 8. In the embodiment shown in the figure, the baffle element 20 can be linearly repositioned with respect to the end 15 of the exhaust gas supply conduit 8 having an outlet in the reactor chamber 10. The baffle element 20 can be repositioned with respect to the downstream end 15 of the exhaust gas supply conduit 8 so that the exhaust gas supply conduit 8 is blocked at the downstream end 15 or the exhaust gas supply conduit is downstream. Open at the end 15. When the baffle element 20 shuts off the exhaust gas supply conduit 8 at the downstream end 15, the blocking organ 13 of the bypass 12 is preferably open so that the exhaust gas is in that case the SCR catalytic converter 9 or the SCR catalyst. It completely passes through the reactor chamber 10 that receives the converter 9. When the baffle element 20 opens the downstream end 15 of the exhaust gas supply conduit 8, the blocking organ 13 of the bypass 12 is either completely closed or at least partially open. good.

When the baffle element 20 opens the downstream end 15 of the exhaust gas supply conduit 8, the relative position of the baffle element 20 with respect to the downstream end 15 of the exhaust gas supply conduit 8 is particularly the exhaust gas mass passing through the exhaust gas supply conduit 8. It depends on the flow rate and / or on the exhaust gas temperature of the exhaust gas in the exhaust gas supply conduit 8 and / or on the amount of reducing agent introduced into the exhaust gas stream via the introduction device 16.

A further action of the baffle element 20 when the downstream end 15 of the exhaust gas supply conduit 8 is open is that, in some cases, when a liquid reducing agent droplet is present in the exhaust gas flow, the droplet is the baffle element. It is to reach 20 and be captured and atomized in its place thereby preventing such droplets of liquid reducing agent from reaching the region of the SCR catalytic converter 9. When the downstream end 15 is open, the baffle element 20 is relative to the downstream end 15 of the exhaust gas supply conduit 8 in particular within the region of the downstream end 15 of the exhaust gas supply conduit 8. So, the exhaust gas that is redirected in the region of the baffle element 20 is relatively strong to be guided or deflected towards the radially inner section of the SCR catalytic converter 9, or is radially outer. It can be relatively strong or set to be guided or deflected towards the section.

The baffle element 20 is preferably curved while forming a flow guide for the exhaust gas on the surface 20a facing the exhaust gas supply conduit 8, and is preferably curved in a bell shape. That is, the surface 20a of the baffle element 20 facing the downstream end 15 of the exhaust gas supply conduit 8 supplies exhaust gas in the radial inner portion of the baffle element 20 rather than in the radial outer portion of the baffle element. It has a small distance to the downstream end 15 of the conduit 8. Therefore, the baffle element 20 recedes or curves in the center of the surface 20a toward the downstream end portion 15 of the exhaust gas supply conduit 8 in the direction opposite to the flow direction of the exhaust gas.

As described above, the exhaust gas supply conduit 8 has an outlet in the reactor chamber 10 by the downstream end 15, and the reactor chamber 10 receives the SCR catalytic converter 9. According to FIG. 2, at this time, the exhaust gas supply conduit 8 penetrates the lower surface 22 of the reactor chamber 10, and the downstream end portion 15 of the exhaust gas supply conduit is terminated adjacent to the upper surface 23 of the reactor chamber 10 and has already been completed. As mentioned, the exhaust gas exiting the exhaust gas supply conduit at the downstream end 15 is turned 180 ° before the exhaust gas subsequently flows through the SCR catalytic converter 9.

The exhaust gas aftertreatment system 3 has a plurality of blowing devices 24, and the blowing device is preferably provided inside the reactor chamber 10 in which the SCR catalytic converter 9 is received, and is implemented as, for example, an air nozzle. At this time, each of the blowing devices 24 helps to purify the SCR catalytic converter 9 with respect to the soot particles and ash particles deposited on the SCR catalytic converter, thereby avoiding clogging of the SCR catalytic converter 9. The blowout device 24 is provided in a common accumulator 25. The accumulator may be provided around the reactor chamber 10 as shown in this figure and FIG. 3, and may be provided below or above the reactor, although not shown in this figure. In this case, the diameter of the accumulator ring 25 can be reduced, resulting in an overall diameter of the reactor 10 and accumulator ring 25 being reduced. At this time, the pressure vessel ring 25 may be implemented so that the diameter of the pressure vessel ring does not become larger than the diameter of the reactor 10, including the heat insulating portion of the reactor which is particularly required. This eliminates the need for additional configuration space for the pressure vessel ring in terms of diameter. In that case, the supply 26 to the blowout device 24 is done in a meaningful way from above or below through the bottom surface 22 or top surface 23 of the reactor housing, thereby preventing the diameter from expanding. At this time, the pressure vessel ring 25 is advantageously provided parallel to the plane formed by the catalytic converter 9.

Here, FIG. 3 shows a suitable orientation of the blowout device 24, and the blowout device is preferably such that a turbulent flow or a vortex flow is generated inside the reactor chamber 10 and also crosses a once-through direction or an exhaust gas flow direction. Oriented to the surface of the extending SCR catalytic converter 9. It may be particularly effective to remove soot particles and ash particles from the SCR catalytic converter 9 by such turbulence or eddy current. Here, FIG. 3 shows that the reactor chamber 10 in which the SCR catalytic converter 9 is received preferably has a circular wall portion 19 in cross section, which is a lower surface 22 and an upper surface 23 of the reactor chamber 10. It extends in between. By combining the orientation of the blowout device 24 with such a wall portion 19, turbulence or eddy currents can be formed in particular advantage.

The blowing device 24 shown in FIG. 3 can be supplied with a medium for purifying the SCR catalytic converter 9 from a pressure accumulator 25 common to all blowing devices 24, and all blowing devices 24 can be supplied with a medium for purifying the SCR catalytic converter 9. On the other hand, in the embodiment of FIG. 3, the common accumulator 25 extends in a circular shape or a ring shape around the SCR catalytic converter 9 and around the blowout device 24. At this time, in the embodiment of FIG. 3, the accumulator 25 is arranged outside the reactor chamber 10, so that in FIG. 3, the common accumulator 25 is also circular or circular around the reactor chamber 10. It extends in a ring shape. As already mentioned for FIG. 1, the accumulator 25 may be located above or below the reactor chamber 10, which may reduce the diameter of the accumulator ring 25.

Each of the blowout devices 24 may be supplied with a medium for purifying the SCR catalytic converter 9 via a supply conduit 26 starting from a common accumulator 25, and in the embodiment of FIG. 3, individual supplies. The conduit 26 originates from a common accumulator 25 and is directed towards the individual blowout devices 24, thereby extending into the reactor chamber 10 and penetrating the wall 19 of the reactor chamber 10.

Although not shown in FIG. 3, it is also possible to arrange the accumulator 25 inside the reactor chamber 10, in which case the supply conduit 26 extending from the accumulator 25 to the blowout device 24 is in the reactor chamber 10. There is no need to penetrate the wall portion 19.

As can be seen from FIG. 3, each supply conduit 26 is provided with a switchable valve 27. A medium for purifying the SCR catalytic converter 9 may be individually supplied to each of the blowout devices 24 via each of the switchable valves 27. At this time, by appropriately operating the valve 27, it is possible to simultaneously supply all the blowing devices 24 with a medium for purifying the SCR catalytic converter 9. Unlike this, the valves 27 whose operation can be controlled are opened continuously in a timely manner, whereby only one of the blowing devices 24 is always supplied with a medium for purifying the SCR catalytic converter 9. It is also possible to do.

In the embodiment shown in FIG. 3, the common accumulator 25 is formed as a closed circular accumulator in the form of a circular or ring-shaped tube, and at this time, the closed accumulator 25 orbits the accumulator 25. It means that it is completely orbiting when viewed in the direction or circumferential direction, and is therefore not interrupted in the orbital or circumferential direction. Therefore, the accumulator is completely filled with a medium for purifying the SCR catalytic converter 9 when viewed in the circumferential direction or the circumferential direction, and the medium is freely placed inside the accumulator 25 in the circumferential direction or the circumferential direction. Can flow.

FIG. 3 further shows a connecting conduit 28 for the accumulator 25 that is common to all blowout devices 24, and the accumulator 25 is provided with a medium for purifying the SCR catalytic converter 9 via the connecting conduit. The medium can be supplied starting from the source for the purpose.

FIG. 4 shows one variation of the exhaust gas aftertreatment system. In the exhaust gas aftertreatment system, the SCR catalytic converter 9 is arranged in the catalytic converter chamber 10, and the wall portion 19 of the catalyst chamber has a circular contour in a cross section. It does not have, but rather has a polygonal shape, and in particular, has a rectangular shape as shown in the embodiment of FIG. In this case as well, a plurality of blowing devices 24 are provided, and the blowing device is useful for purifying the SCR catalytic converter 9, and the blowing device 24 also starts from the common accumulator 25 and reaches the blowing device 24. A medium for purifying the SCR catalytic converter 9 can be supplied by using the switchable valve 27 provided in the supply conduit 26 via the supply conduit 26 which is open and branched from the common accumulator 25. Is. The accumulator 25, which is common in the embodiment of FIG. 4, has a polygonal contour like the wall portion 19 of the reactor chamber 10, that is, is assembled from a plurality of tube segments as a polygonal tube. The tube extends around the SCR catalytic converter 9 and around the blowout device 24, especially around the reactor chamber 10. Here, in the embodiment of FIG. 4, the blowing device 24 is not arranged inside the reactor chamber 10, but rather only the injection opening of the blowing device 24 has an outlet in the region of the wall portion 19 of the reactor chamber 10. As a result, the blowing device 24 can blow out a medium for purifying the SCR catalytic converter 9 through the SCR catalytic converter 9.

The length of the supply conduit 26 is up to 1.5 m, preferably up to 1 m, particularly preferably up to 0.5 m.

Ash and soot are removed from the upstream end face of the SCR catalytic converter 9 in the flow direction of the exhaust gas through the blowout device 24, so that the blowout direction of the blowout device 24 is the exhaust gas passing through the SCR catalytic converter 9. It is provided almost perpendicular to the flow direction.

The accumulator 25 shown in FIG. 4 is also formed to provide a flow path for a medium for purifying the SCR catalytic converter 9, which is preferably closed in a direction orbiting the reactor chamber 10. The flow path is therefore uninterrupted at any position so that the medium can flow freely within the accumulator 25 or be distributed unimpeded.

In a preferred configuration of the exhaust gas aftertreatment system, the accumulator 25 common to the blowout device 24 has a predetermined accumulator volume, and the following conditional expression is preferably applied to the accumulator volume.

[Number 1]
V = K ^* (273 + T) / (273 ^* Δp)

In the above equation, V is the value of the accumulator volume expressed in liters, K is the value between 200 and 6000, and T is the value of the temperature of the blowout medium expressed in ° C. Δp. Is the value of the pressure difference between the pressure in the accumulator 25 and the pressure in the reactor chamber 10 expressed by bar.

When the accumulator 25 has such an accumulator volume, the blowout device 24 may be particularly preferably supplied with a medium for purifying the SCR catalytic converter, thereby effectively removing soot and ash from the SCR catalytic converter 9. do.

In the internal combustion engine 1 of FIG. 1, the exhaust gas aftertreatment system 3 is arranged above the exhaust gas supercharging system 2 in an upright state. Access to the cylinder of the internal combustion engine 1 is free, but access to the turbochargers 4 and 5 is restricted. However, the reactor chamber 10 can be easily removed when the necessary maintenance work is performed on the turbochargers 4 and 6.

Unlike the configuration in which the exhaust gas aftertreatment system 3 is vertically arranged above the exhaust gas supercharging system 2 shown in FIG. 1, the exhaust gas aftertreatment system 3 is tilted by 90 ° so as to be adjacent to the exhaust gas supercharging system 2. It is possible to construct it horizontally, but in such a horizontal configuration, the length of the structure increases. However, in that case, the internal combustion engine 1 and the exhaust gas supercharging system 2 do not need to be removed from the reactor chamber 10 at the time of maintenance work, and can be used without limitation.

1 Internal combustion engine 2 Exhaust gas supercharging system 3 Exhaust gas aftertreatment system 4 Turbocharger 5 Turbocharger 6 High pressure turbine 7 Low pressure turbine 8 Exhaust gas supply conduit 9 SCR catalytic converter 10 Reactor room 11 Exhaust gas exhaust conduit 12 Bypass 13 Blocking organ 14 Exhaust gas guide 15 end Part 16 Introducing device 17 Injection cone 18 Mixing path 19 Wall part 20 Baffle element 21 Conduit 22 Face 23 Face 24 Blow-out device 25 Accumulator 26 Supply conduit 27 Valve 28 Connection conduit

Claims (10)

The exhaust gas aftertreatment system (3) of the internal combustion engine, that is, the SCR exhaust gas aftertreatment system of the internal combustion engine.
The SCR catalytic converter (9) received in the reactor chamber (10) and
An exhaust gas supply conduit (8) leading to the reactor chamber (10) and also to the SCR catalytic converter (9).
An exhaust gas discharge conduit (11) leading from the reactor chamber (10) and away from the SCR catalytic converter (9).
In an exhaust gas aftertreatment system, which is arranged in the exhaust gas supply conduit (8) and includes an introduction device (16) for introducing a reducing agent into the exhaust gas.
A plurality of blowing devices (24) that contribute to purifying the SCR catalytic converter (9), and
A common accumulator (25) for the blowout device (24), the accumulator is formed in a circular shape or a polygonal shape, and the blowout device (24) starts from the common accumulator (25). , A pressure accumulator capable of supplying a medium for purifying the SCR catalytic converter (9), and
In the SCR exhaust gas aftertreatment system provided with
The blowout device (24) provided in the accumulator (25) is oriented toward the SCR catalytic converter (9) so as to generate a turbulent flow or a vortex flow inside the reactor chamber (10). An exhaust gas aftertreatment system characterized by being The common accumulator (25) extends outside the reactor chamber (10) around the reactor chamber (10), or is provided below or above the reactor chamber (10). The exhaust gas aftertreatment system according to claim 1. Starting from the common accumulator (25), a supply conduit (26) exits to each blowout device (24), and the SCR catalyst is connected to the individual blowout device (24) via the supply conduit. Claim 1 or 2 characterized in that the medium for purifying the converter (9) can be supplied and the individual supply conduits (26) are provided with a switchable valve (27). Exhaust gas aftertreatment system described in. Each supply conduit (26) starts from the accumulator (25) arranged outside the reactor chamber (10), penetrates the wall portion of the reactor chamber (10), and penetrates the reactor chamber (10). Claim 2 is characterized in that a switchable valve (27) is provided in each supply conduit (26) extending to the individual blowing device (24) provided in 10). Or the exhaust gas aftertreatment system according to claim 3, which is subordinate to claim 2. Claim 1 is characterized in that the common accumulator (25) extends around the reactor chamber (10) and / or around the blowout device (24) in a state of being closed in the circumferential direction. The exhaust gas aftertreatment system according to any one of 4 to 4. The exhaust gas according to any one of claims 1 to 4, wherein the common accumulator (25) is attached to the lower surface (22) or the upper surface (23) of the reactor chamber (10). Post-processing system. The supply conduit (26) to the blowout device (24) is performed from the common accumulator (25) via the lower surface (22) or the upper surface (23) of the reactor chamber (10). The exhaust gas aftertreatment system according to claim 6. The common accumulator (25) is formed as a circular or polygonal tube, and the tube is in a closed state around the reactor chamber (10) and around the blowout device (24). The exhaust gas aftertreatment system according to any one of claims 1 to 7, wherein the exhaust gas aftertreatment system is characterized in that it extends to. The common accumulator (25) has an accumulator volume, and for the accumulator volume, the following formula V = K * (273 + T) / (273 * Δp).
Is true,
In the above equation, V is the value of the accumulator volume expressed in liters, K is a value between 200 and 6000, and T is the value of the temperature of the blowout medium in ° C. , Δp is any one of claims 1 to 8, wherein the value of the pressure difference between the pressure in the accumulator (25) and the pressure in the reactor chamber (10) is expressed by bar. The exhaust gas aftertreatment system described in item 1. An internal combustion engine provided with the exhaust gas aftertreatment system (3) according to any one of claims 1 to 9, wherein the internal combustion engine includes a first turbocharger (4) including a high-pressure turbine (6). It has a multi-stage exhaust gas supercharging system (2) including a second turbocharger (5) including a low pressure turbine (7), and the exhaust gas aftertreatment system (3) is the high pressure turbine (6) and the above. An internal combustion engine characterized by being interposed between low-pressure turbines (7).

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