KR102122849B1 - Selective catalytic reduction(SCR) device for vehicles - Google Patents

Abstract

The present invention relates to a selective catalytic reduction (SCR) device, and more specifically, to an SCR device in which a diesel oxidation catalyst (DOC), a mixer, and a selective catalytic reduction (SCR) catalyst of the SCR device are designed in module units and adopt an intermediate pipe for installation, and thus can be installed in a confined space. By manufacturing and applying the intermediate pipe in a curved or straight shape, a proper intermediate pipe can be provided for a vehicle where the intermediate pipe is to be installed and also used as a mixer. It is possible to improve mixing effects by installing the mixer at the rear end of an injector, making a mixing blade in the mixer overlap the rear end of the injector, and installing an additional mixing blade at the rear end of a mixer line. By selecting a coupling between diesel oxidation catalyst (DOC) canning and the intermediate pipe, the mixer and the intermediate pipe, and the mixer and SCR catalyst canning from a flange insert type, a clam type, a pin type, and a wire type and applying the same, the diversity of coupling can be achieved. In addition, it is possible to improve nitrogen oxides (NO_X) reduction performance in an operating range of lower temperature exhaust gas by using an SCR catalyst which shows high nitrogen oxide (NO_X) reduction performance at a low temperature through the improvement of a catalyst loading amount and component. Moreover, there is an effect that a filter for removing diesel particulate matter (DPF) can be installed at the front or rear end of the SCR catalyst.

Description

Selective catalytic reduction (SCR) device for vehicles}

The present invention is a selective reduction catalyst (SCR) of the diesel oxidation catalyst (DOC), a mixer (MIXER), a selective reduction catalyst (SCR) is designed and installed in a module unit by applying an intermediate pipe, so it can be installed in a confined space And, by manufacturing and applying the intermediate pipe in a bent or straight form, it can be provided according to the vehicle to be mounted, as well as the intermediate pipe can act as a mixer, the mixer is installed at the rear end of the injector and the mixer By mixing the inner mixing blade at the rear end of the injector and additionally installing the mixing blade at the end of the mixer line, the mixing effect can be improved, and between the diesel oxidation catalyst (DOC) canning and the intermediate pipe, the mixer ( MIXER) and the middle pipe, and the combination between the mixer (MIXER) and the selective reduction catalyst (SCR) canning can be applied by selecting from the flange insertion type, clamp type, pin type, and wire type, to provide variety of coupling. , Improves the reduction performance of nitrogen oxides (NO _X ) in the operating region with low exhaust gas temperature by using a selective reduction catalyst (SCR) with high performance of reducing nitrogen oxides (NO _X ) at low temperatures through improvement of the catalyst loading amount and components. , Diesel particulate matter removal filter (DPF) device is a technology for a selective reduction catalyst (SCR) device for a vehicle that can be installed in the front or rear end of the selective reduction catalyst (SCR).

1 shows an exhaust system of a conventional vehicle, and the exhaust gas discharged when the engine E is operated passes through the catalytic device 10, and components harmful to the human body, such as carbon monoxide and nitrogen compounds, are purified.

Subsequently, in the auxiliary silencer 20 attached to the rear end of the catalytic device 10, the primary sound absorbing action of the exhaust gas is performed, so that the rough sound in the high frequency band is primarily reduced, and the exhaust gas passing through the auxiliary silencer 20 is It flows into the main silencer 30 through the exhaust pipe 40.

The address silencer 30 is a main part that determines noise reduction of exhaust gas.

The conventional exhaust system as described above is an exhaust system mounted on a vehicle that mainly uses a catalyst device of the integrated type close-coupled catalytic converter (CCC) type, and the immobilization efficiency for more conforming to the strict regulatory standards of automobile exhaust gas. The catalytic device, the WCC (Warming-Up Catalytic Converter) type catalytic device and the UCC (Underbody Catalytic Converter) catalytic device, are used together in the exhaust system. Compared to the environment, there is a need to improve the back pressure generated from two catalyst devices of the WCC catalyst device and the UCC catalyst device.

In addition, in automobiles, more than 95% are gaseous substances that are burned as gas discharged through exhaust pipes, and most of the fossil fuels we use today are mixtures of various types of HC, and these HCs are required for complete combustion. It must be combined with oxygen to produce only water vapor and carbon dioxide.

However, even if the engine's operating condition is optimal combustion at the current level of technology, the mixture cannot be completely combusted, so the exhaust gas must contain harmful substances.

When the gasoline engine is operated under the load medium speed among these harmful substances, most of the exhaust gas is nitrogen (71%), carbon dioxide gas (18.1%), water vapor (9.2%), and the harmful substances are about 1% of the total exhaust gas. , The harmful substances included here are mainly carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx).

Oxidation catalysts, which reduce CO and HC by oxidation reactions, have been used in the early stages to reduce exhaust gases in vehicles.

On the other hand, the harmful emissions of diesel vehicles are composed of CO, HC, NO _X and PM, and since diesel engines are burned under conditions of lean air-fuel ratio due to their combustion characteristics, they have less emission of unburned products, CO and HC, than gasoline engines. However, a relatively large amount of NO _X is discharged due to the high compression ratio, and particulate matter (PM) is generated due to the diesel fuel injection characteristics.

In order to reduce the exhaust gas of diesel engines in accordance with the exhaust gas regulation, harmful emissions emitted from diesel engines have been lowered by using EGR systems and common rails (DOC, PMC).

However, in order to satisfy the increasingly stringent emission regulations, it is essential to apply a post-treatment device for reducing NO _X emissions.

Figure 2 shows the exhaust system of a conventional diesel engine vehicle, while the exhaust gas discharged during the operation of the engine E passes through the diesel particulate matter filter (PMC) 50, the particulate matter is purified and additional nitrogen oxides ( NO _X ) It is necessary to improve the reduction performance.

Therefore, when the diesel oxidation catalyst (DOC), mixer (MIXER), and selective reduction catalyst (SCR) of the selective reduction catalyst (SCR) device are designed and mounted in a module unit, intermediate piping can be applied to install in a confined space. The intermediate pipe can be manufactured in a bent or straight form to apply to the vehicle to be mounted, as well as the intermediate pipe can act as a mixer, and the mixer can be installed at the rear end of the injector and the mixing blade in the mixer Is superimposed on the rear end of the injector, and a mixing blade is additionally installed at the end of the mixer line, so that the mixing effect can be improved, and the nitrogen oxide (NO _X ) reduction performance at low temperature is improved through the improvement of the loading amount and components of the catalyst. The use of high selective reduction catalyst (SCR) improves the reduction performance of nitrogen oxides (NO _X ) in the operating region where the exhaust gas temperature is low, and a filter (DPF) device for removing diesel particulate matter shears the selective reduction catalyst (SCR) Alternatively, there is an urgent need for the development of a selective reduction catalyst (SCR) device for a vehicle that can be installed at a rear end.

KR 10-2009-0080360 (August 28, 2009)

Therefore, the present invention was conceived to solve the above problems, and designed and installed a diesel oxidation catalyst (DOC), a mixer (MIXER), and a selective reduction catalyst (SCR) of a selective reduction catalyst (SCR) device in module units. When the intermediate pipe is applied, the object is to provide a selective reduction catalyst (SCR) device for a vehicle that can be installed in a confined space.

Another object of the present invention is to produce and apply an intermediate pipe in a bent form or a straight form, so that it can be provided according to a vehicle to be mounted, as well as a selective reduction catalyst (SCR) for a vehicle that can act as a mixer in parallel. It is intended to provide a device.

Another object of the present invention is to install the mixer at the rear end of the injector, make the mixing blade in the mixer overlap the rear end of the injector, and additionally install the mixing blade at the rear end of the mixer line, thereby improving the mixing effect. It is to provide a selective reduction catalyst (SCR) device for a vehicle.

Another object of the present invention is a flange insertion type, clamp between the diesel oxidation catalyst (DOC) canning and the intermediate pipe, between the mixer (MIXER) and the intermediate pipe, and between the mixer (MIXER) and the selective reduction catalyst (SCR) canning. It is to provide a selective reduction catalyst (SCR) device for a vehicle that can provide a variety of bonding by selecting and applying a form, a pin form, or a wire form.

Another object of the invention is the nitrogen oxide (NO _X) reduction performance is high selective reduction catalyst by using (SCR) of nitrogen in the low exhaust gas temperature operating range oxides (NO _X) at a low temperature by improving catalysts Loading amount and ingredient It is to provide a selective reduction catalyst (SCR) device for a vehicle to improve the reduction performance.

Another object of the present invention is to provide a selective reduction catalyst (SCR) device for a vehicle in which a diesel particulate filter (DPF) device can be installed at the front or rear end of a selective reduction catalyst (SCR).

A selective reduction catalyst (SCR) device for a vehicle according to an exemplary embodiment of the present invention for achieving the above object is 150 to 300°C in the exhaust gas when the exhaust gas combusted from the engine E enters the exhaust pipe through the exhaust manifold. Diesel oxidation catalyst (DOC) that reduces carbon monoxide (CO) and hydrocarbon (HC) by catalytic reaction through high heat, burns particulate matter (PM), and increases the proportion of nitrogen dioxide (NO ₂ ) in exhaust gas Diesel oxidation catalyst (DOC) canning comprising a; A coupling member that combines the diesel oxidation catalyst (DOC) canning and the first intermediate pipe, and selects one of a flange insertion type, a clamp type, a pin type, and a wire type; A first intermediate pipe coupled by a coupling member coupling the first intermediate pipe, serving as a mixer, and having a bent shape or a straight shape suitable for a vehicle to be mounted; A urea injector mounted between the first intermediate pipe and the front end of the first mixer, and spraying a urea urea aqueous solution; Mounted at the rear end of the urea injector, the aqueous solution of urea sprayed from the urea injector is vaporized with ammonia to be mixed, and the shape of the blade mounted in the first mixer is a square plate bending or arc shape, and the blade is the first mixer The front end of the four blades consisting of a single set is mounted overlapping two, the rear end of the first mixer is equipped with four blades consisting of one set, one is mounted, or the front end or rear end of the first mixer blade A first mixer (MIXER) in which one of six pieces is selected from one set to improve the mixing effect; A coupling member that combines the first mixer (MIXER) and the second intermediate pipe, and selects one of a flange insertion type, a clamp type, a pin type, and a wire type; A second intermediate pipe coupled by a coupling member coupling the second intermediate pipe, serving as a mixer, and having a bent shape or a straight shape suitable for a vehicle to be mounted; It is mounted on the rear end portion of the second intermediate pipe, and the urea aqueous solution injected from the urea injector is vaporized with ammonia to be mixed again, and the shape of the blade mounted in the second mixer is a square plate bend or arc shape, In the front end of the second mixer, two blades of four blades are configured as one set, or two blades of four blades of one set are mounted at the rear end of the second mixer, or the second mixer. A second mixer (MIXER) for improving mixing effect by selecting one of six blades consisting of one set at the front end or the rear end of the blade; A coupling member which combines the second mixer (MIXER) and selective reduction catalyst (SCR) canning, and selects one of a flange insertion type, a clamp type, a pin type, and a wire type; The selective reduction catalyst (SCR) is combined by a coupling member that combines canning, and when the urea aqueous solution is sprayed onto the exhaust pipe, the aqueous urea solution is decomposed into ammonia at high temperature, and then ammonia and nitrogen oxides (NO _X ) react and react with nitrogen oxides (NO _X ) contains a selective reduction catalyst (SCR) to reduce, and the catalyst included in the selective reduction catalyst (SCR) canning is V ₂ O ₅ -Al ₂ O ₃ , V ₂ O ₅ -SiO ₂ -TiO ₂ , V Metal oxide catalyst selected from ₂ O ₅ -WO ₃ -TiO ₂ , Fe ₂ O ₃ -TiO ₂ , CuO-TiO ₂ or selective reduction catalyst (SCR) which is a Zeolite-based catalyst selected from Y-type Zeolite, Mordenite, ZSM-5 ) Canning; Characterized in that it includes.

In the present invention, the selective reduction catalyst (SCR) canning is connected by a third intermediate pipe, and the particulate reduction material (PM) is collected from the exhaust gas that has passed through the selective reduction catalyst (SCR) canning to collect particulate matter. When (PM) accumulates a predetermined amount, a filter for removing particulate matter (DPF) that regenerates and regenerates particulate matter (PM) by being selected from exhaust fumes, additives, and a separate heating device; Characterized in that it further comprises.

In the present invention, the coupling member is characterized in that it comprises selecting any one of a flange insertion form, clamp form, pin form, iron wire form.

In the present invention, the first intermediate pipe and the second intermediate pipe are characterized in that they include a bent shape or a straight shape to fit the vehicle to be mounted.

In the present invention, the shape of the blade mounted in the first mixer and the second mixer is characterized in that it comprises a rectangular plate bent or arc shape.

In the present invention, the blade is configured such that two blades are formed of one set at the front end of the first mixer and the second mixer, and four blades are provided at the rear ends of the first mixer and the second mixer. It is characterized in that it comprises a set of one is mounted, the first mixer and the second mixer is equipped with one blade is composed of one set of six blades to improve the mixing effect.

In the present invention, the catalyst included in the selective reduction catalyst (SCR) canning is V ₂ O ₅ -Al ₂ O ₃ , V ₂ O ₅ -SiO ₂ -TiO ₂ , V ₂ O ₅ -WO ₃ -TiO ₂ , Fe ₂ O ₃ -TiO ₂ , CuO-TiO ₂ , or a metal oxide catalyst selected from Y-type Zeolite, Mordenite, or ZSM-5.

As described above, the present invention, a selective reduction catalyst (SCR) device for a vehicle has the following effects.

First, the present invention is installed in a confined space by applying intermediate piping when designing and mounting a diesel oxidation catalyst (DOC), a mixer (MIXER), and a selective reduction catalyst (SCR) of a selective reduction catalyst (SCR) device in module units. Is possible.

Second, according to the present invention, the intermediate pipe can be provided in a bent form or in a straight line, so that it can be provided according to the vehicle to be mounted, and the intermediate pipe can also act as a mixer.

Third, the present invention can improve the mixing effect by installing the mixer at the rear end of the injector, allowing the mixing blade in the mixer to overlap the rear end of the injector, and additionally installing the mixing blade at the end of the mixer line.

Fourth, the present invention is a flange insertion type, clamp type coupling between a diesel oxidation catalyst (DOC) canning and an intermediate pipe, between a mixer (MIXER) and an intermediate pipe, and between a mixer (MIXER) and a selective reduction catalyst (SCR) canning. , By selecting and applying from a pin form or a wire form, diversity of bonds can be provided.

Fifth, the present invention uses a selective reduction catalyst (SCR) with a high performance of reducing nitrogen oxides (NO _X ) at low temperatures through improvement of the catalyst loading amount and components to reduce nitrogen oxides (NO _X ) in the operating region where the exhaust gas temperature is low. Improves performance.

Sixth, in the present invention, a diesel particulate filter (DPF) device may be installed at the front end or the rear end of a selective reduction catalyst (SCR).

1 is a view showing the configuration of an exhaust system including a conventional catalyst device.
2 is a view showing an exhaust system of a conventional diesel engine vehicle.
Figure 3 is a view showing for explaining the configuration of a selective reduction catalyst (SCR) device for a vehicle according to an embodiment of the present invention.
Figure 4 is a view showing for explaining the configuration of a selective reduction catalyst (SCR) device for a vehicle according to another embodiment of the present invention.
5(a) to 5(f) are views for explaining the shape of a blade mounted to a mixer during the construction of a selective reduction catalyst (SCR) device for a vehicle according to an embodiment or another embodiment of the present invention.
6 (a) to 6 (c) is a configuration of a selective reduction catalyst (SCR) device for a vehicle according to an embodiment of the present invention, the mixer (MIXER) front and rear blades and the mixer (MIXER) vortex shape inside Picture drawing shown to explain.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. In the description of the present invention, when it is determined that a detailed description of a related known technology or configuration may unnecessarily obscure the subject matter of the present invention, the detailed The description will be omitted, and the terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or practice, so the definition of the present invention is a selective reduction catalyst (SCR) device for a vehicle. It should be made based on the contents described throughout this specification.

Hereinafter, a selective reduction catalyst (SCR) device for a vehicle according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a view showing to explain the configuration of a vehicle selective reduction catalyst (SCR) device according to an embodiment of the present invention, Figure 4 is a selective reduction catalyst (SCR) device for a vehicle according to another embodiment of the present invention 5(a) to 5(f) are blades mounted to a mixer during the configuration of a selective reduction catalyst (SCR) device for a vehicle according to an embodiment or another embodiment of the present invention. Figure 6 (a) to 6 (c) is a view showing for explaining the shape of a mixer (MIXER) front and rear blades of the configuration of the selective reduction catalyst (SCR) device for a vehicle according to an embodiment of the present invention It is a picture drawing to explain the shape of the vortex inside the MIXER.

The selective reduction catalyst (SCR) device for the present inventors includes an engine (E), an exhaust manifold (100), a diesel oxidation catalyst (DOC) canning (200), a first intermediate pipe (300), a second intermediate pipe (310), Coupling member 400, first mixer (MIXER) 500, second mixer (MIXER) 510, blade 520, urea injector 600, selective reduction catalyst (SCR) canning 700, diesel particulate And a filter for removing substances (DPF) 800.

3 to 6 (c), the present invention, the selective reduction catalyst (SCR) device for a vehicle is exhaust gas from the engine (E) when the exhaust gas enters the exhaust pipe through the exhaust manifold (100) from the exhaust gas Diesel oxidation that reduces carbon monoxide (CO) and hydrocarbon (HC) by catalytic reaction through high heat of 150 to 300℃, burns particulate matter (PM), and increases the proportion of nitrogen dioxide (NO ₂ ) in exhaust gas A diesel oxidation catalyst (DOC) canning 200 including a catalyst (DOC); A coupling member 400 for coupling the diesel oxidation catalyst (DOC) canning 200 and the first intermediate pipe 300; A first intermediate pipe 300 coupled by a coupling member 400 coupling the first intermediate pipe 300, and performing a role of a mixer; A urea injector 600 mounted between the first intermediate pipe 300 and the front end of the first mixer 500 and spraying a urea urea aqueous solution; A first mixer (MIXER) 500 mounted at a rear end of the urea injector 600 and allowing urea aqueous solution injected from the urea injector 600 to be vaporized and mixed with ammonia; A coupling member 400 for coupling the first mixer (MIXER) 500 and the second intermediate pipe 310; A second intermediate pipe 310 coupled by a coupling member 400 for coupling the second intermediate pipe 300, and serving as a mixer; A second mixer (MIXER) 510 mounted on the rear end portion of the second intermediate pipe 310 and mixing again when urea aqueous solution injected from the urea injector 600 is vaporized into ammonia; A coupling member 400 for coupling the second mixer (MIXER) 510 and a selective reduction catalyst (SCR) canning 700; The selective reduction catalyst (SCR) is combined by a coupling member 400 that combines the canning 700, and when the urea aqueous solution is sprayed into the exhaust pipe, ammonia and nitrogen oxides (NO _X ) are decomposed after the urea aqueous solution is decomposed into ammonia at high temperature. It has a selective reduction catalyst (SCR) canning 700 including a selective reduction catalyst (SCR) that reacts to reduce nitrogen oxides (NO _X ), by the selective reduction catalyst (SCR) canning and the third intermediate piping. Connected, and collects particulate matter (PM) remaining in the exhaust gas that has passed through the selective reduction catalyst (SCR) canning, and when a certain amount of particulate matter (PM) accumulates, it is selected from exhaust gas, additives, and a separate heating device. It further comprises a filter for removing particulate matter (DPF) 800 for regeneration by reburning particulate matter (PM).

When describing the functions of each technical means constituting the present invention the selective reduction catalyst (SCR) device for a vehicle is as follows.

The diesel oxidation catalyst (DOC) canning 200 is carbon monoxide through a high temperature of 150 to 300 ℃ in the exhaust gas when the exhaust gas combusted from the engine (E) enters the exhaust pipe through the exhaust manifold (100) It includes a diesel oxidation catalyst (DOC) that reduces (CO) and hydrocarbon (HC) by catalytic reaction, burns particulate matter (PM), and increases the proportion of nitrogen dioxide (NO ₂ ) in the exhaust gas.

The coupling member 400 is to combine the diesel oxidation catalyst (DOC) canning 200 and the first intermediate pipe 300. Here, the coupling member 400 is most preferably a flange insertion form, but a clamp form, a pin form, and a wire form can also be applied.

The first intermediate pipe 300 is coupled by the coupling member 400 and serves as a mixer. Here, the first intermediate pipe 300 is a bent form or a straight form to fit the vehicle to be mounted.

The urea injector 600 is mounted between the first intermediate pipe 300 and the front end of the first mixer 500 to spray an urea urea aqueous solution.

The first mixer (MIXER) 500 is mounted on the rear end of the urea injector 600, and the urea aqueous solution injected from the urea injector 600 is vaporized with ammonia to be mixed. Here, the shape of the blade 520 mounted in the first mixer 500 is in the form of a square plate bent or arc.

In addition, the blade 520 is mounted on the front end of the first mixer 500 such that two blades 520 are composed of one set, and two are overlapped (FIG. 5(b)), or the first mixer 500 One of the four blades 520 is composed of one set at the rear end (FIG. 5(a) and FIG. 5(c)), or the blade 520 at the front end or rear end of the first mixer 500. The dog is composed of one set is selected from among the one mounted (Fig. 5(d) to Fig. 5(f)) to improve the mixing effect.

The coupling member 400 is to combine the first mixer (MIXER) 500 and the second intermediate pipe 310. Here, the coupling member 400 is most preferably a flange insertion form, but a clamp form, a pin form, and a wire form can also be applied.

The second intermediate pipe 310 is coupled by the coupling member 400 and serves as a mixer. Here, the second intermediate pipe 310 is in a bent shape or a straight shape to fit the vehicle to be mounted.

The second mixer (MIXER) 510 is mounted on the rear end portion of the second intermediate pipe 310, and the urea aqueous solution injected from the urea injector 600 is vaporized with ammonia to be mixed again. Here, the shape of the blade 520 mounted in the second mixer 510 is a square plate bent or arc shape.

In addition, the blade 520 is mounted on the front end of the second mixer 510 so that the two blades 520 are configured as one set, two of which overlap (FIG. 5(b)), or the second mixer 510. One of the four blades 520 is composed of one set at the rear end (FIG. 5(a) and FIG. 5(c)), or the blade 520 at the front end or rear end of the second mixer 510. The dog is composed of one set is selected from among the one mounted (Fig. 5(d) to Fig. 5(f)) to improve the mixing effect.

The coupling member 400 is to combine the second mixer (MIXER) 510 and a selective reduction catalyst (SCR) canning 700. Here, the coupling member 400 is most preferably a flange insertion form, but a clamp form, a pin form, and a wire form can also be applied.

The selective catalytic reduction (SCR) canning 700 is coupled by the coupling member 400, and when urea (urea aqueous solution) is injected into the exhaust pipe, urea is decomposed into ammonia at high temperature, and then ammonia and nitrogen oxides It includes a selective reduction catalyst (SCR) that (NO _X ) reacts to reduce nitrogen oxides (NO _X ). Here, the catalyst included in the selective reduction catalyst (SCR) canning 700 is V ₂ O ₅ -Al ₂ O ₃ , V ₂ O ₅ -SiO ₂ -TiO ₂ , V ₂ O ₅ -WO ₃ -TiO ₂ , It is a metal oxide catalyst selected from Fe ₂ O ₃ -TiO ₂ and CuO-TiO ₂ or a zeolite-based catalyst selected from Y-type Zeolite, Mordenite and ZSM-5.

FIG. 4 is a form in which a diesel particulate removal filter (DPF) 800 is further coupled to a vehicle selective reduction catalyst (SCR) device as illustrated in FIG. 3, and the diesel particulate removal filter (Diesel Particulate Filter: DPF) 800 is connected by the selective reduction catalyst (SCR) canning 700 and the third intermediate pipe 320, and exhausts passing through the selective reduction catalyst (SCR) canning 700 The particulate matter (PM) remaining in the gas is collected, and when the predetermined amount of particulate matter (PM) accumulates, it is selected from soot exhaust gas, additives, and a separate heating device to regenerate and regenerate the particulate matter (PM). Here, as a method of reducing particulate matter (PM), the use of a diesel particulate matter removal filter (DPF), which is a soot reduction device, is most effective, and the principle of the diesel particulate matter removal filter (DPF) is soot filtration installed in an exhaust pipe. It consists of the process of collecting soot and PM in the filter of the device and the regeneration process of burning the collected soot.

In addition, the diesel particulate filter (DPF) device can be installed in the front or rear end of the selective reduction catalyst (SCR).

6(a) to 6(c), the mixer (MIXER) front and rear blades (FIG. 6(a) and FIG. 6(b)) 520 and the mixer (MIXER) are swirled in the shape. (Fig. 6(c)).

As described above, the selective reduction catalyst (SCR) device for a vehicle can be applied to a vehicle having a diesel engine, and thus, its application is wide.

The present invention is not limited to the above embodiments, and various modifications and changes can be made without departing from the technical spirit of the present invention, and it will be understood by anyone having ordinary skill in the art.

E: Engine 100: Exhaust manifold
200: diesel oxidation catalyst (DOC) canning 300: first intermediate piping
310: second intermediate pipe 320: third intermediate pipe
400: coupling member 500: first mixer
510: second mixer 520: blade
600: urea injector 700: selective reduction catalyst (SCR) canning
800: diesel particulate matter removal filter (DPF)

Claims (7)

In a selective reduction catalyst (SCR) device for a vehicle,
When the exhaust gas combusted from the engine (E) enters the exhaust pipe through the exhaust manifold, carbon monoxide (CO) and hydrocarbon (HC) are reduced by catalytic reaction through high heat of 150 to 300° C. in the exhaust gas, thereby reducing particulate matter. A diesel oxidation catalyst (DOC) canning that includes a diesel oxidation catalyst (DOC) that burns (PM) and increases the proportion of nitrogen dioxide (NO ₂ ) in the exhaust gas;
A coupling member that combines the diesel oxidation catalyst (DOC) canning and the first intermediate pipe, and selects one of a flange insertion type, a clamp type, a pin type, and a wire type;
A first intermediate pipe coupled by a coupling member coupling the first intermediate pipe, serving as a mixer, and having a bent shape or a straight shape suitable for a vehicle to be mounted;
A urea injector mounted between the first intermediate pipe and the front end of the first mixer, and spraying a urea urea aqueous solution;
Mounted at the rear end of the urea injector, the aqueous solution of urea sprayed from the urea injector is vaporized with ammonia to be mixed, and the shape of the blade mounted in the first mixer is a square plate bending or arc shape, and the blade is the first mixer The front end of the four blades consisting of a single set is mounted overlapping two, the rear end of the first mixer is equipped with four blades consisting of one set, one is mounted, or the front end or rear end of the first mixer blade A first mixer (MIXER) in which one consisting of one set of six is selected from one mounted to improve a mixing effect;
A coupling member that combines the first mixer (MIXER) and the second intermediate pipe, and selects one of a flange insertion type, a clamp type, a pin type, and a wire type;
A second intermediate pipe coupled by a coupling member for joining the second intermediate pipe, serving as a mixer, and having a bent shape or a straight shape suitable for a vehicle to be mounted;
It is mounted on the rear end portion of the second intermediate pipe, and the urea aqueous solution injected from the urea injector is vaporized with ammonia to be mixed again, and the shape of the blade mounted in the second mixer is a square plate bending or arc shape, The blade is mounted on the front end of the second mixer with two blades consisting of one set, or two blades are mounted on the rear end of the second mixer, or one with four blades consisting of one set, or the second mixer. A second mixer (MIXER) for improving mixing effect by selecting one of six blades consisting of one set at the front end or the rear end thereof;
A coupling member that combines the second mixer (MIXER) and selective reduction catalyst (SCR) canning and selects one of a flange insertion type, a clamp type, a pin type, and a wire type;
The selective reduction catalyst (SCR) is combined by a coupling member that combines canning, and when the urea aqueous solution is sprayed into the exhaust pipe, the aqueous urea solution is decomposed into ammonia at high temperature, and then ammonia and nitrogen oxides (NO _X ) react to nitrogen oxides (NO _X ) includes a selective reduction catalyst (SCR) to reduce, and the catalyst included in the selective reduction catalyst (SCR) canning is V ₂ O ₅ -Al ₂ O ₃ , V ₂ O ₅ -SiO ₂ -TiO ₂ , V Metal oxide catalyst selected from ₂ O ₅ -WO ₃ -TiO ₂ , Fe ₂ O ₃ -TiO ₂ , CuO-TiO ₂ or selective reduction catalyst (SCR) which is a Zeolite-based catalyst selected from Y-type Zeolite, Mordenite, ZSM-5 ) Canning; Selective reduction catalyst (SCR) device for a vehicle, characterized in that it comprises a. According to claim 1,
Connected by the selective reduction catalyst (SCR) canning and a third intermediate pipe, the particulate matter (PM) is collected by collecting the particulate matter (PM) remaining in the exhaust gas that has passed through the selective reduction catalyst (SCR) canning. A diesel particulate filter (DPF) for removing particulate matter (PMF) that regenerates and regenerates particulate matter (PM) as selected from exhaust fumes, additives and separate heating devices when accumulated; Vehicle selective reduction catalyst (SCR) device characterized in that it further comprises.
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