KR20060102003A - Exhaust gas purification apparatus for invehicle using diesel fuel - Google Patents

Abstract

The present invention relates to a soot purification device for a diesel vehicle. By providing a soot adsorber between exhaust pipes at the tip of a diesel oxidation catalyst device, it is possible to adsorb soot in low and low temperature sections where natural regeneration is difficult, regardless of the conditions of small or large vehicles. In addition, it regenerates the soot adsorbed in the high speed and high temperature range where natural regeneration is desired, and activates the oxidation catalyst function in the rear stage. In order to provide an exhaust gas purification device for a diesel vehicle that can efficiently increase the technical configuration, an exhaust manifold connected through a plurality of cylinders configured in the diesel engine, and an exhaust pipe connected to the exhaust manifold and extended rear Is connected to each other between the exhaust pipe, the diesel oxidation catalyst device is provided sequentially, air resonance And a muffler comprising: a hollow case provided between exhaust pipes at the tip of the diesel oxidation catalyst device, and a soot adsorber capable of adsorbing and oxidizing soot discharged from the engine. It is characterized by.

Soot adsorber, suction / exhaust member, wire mesh, suction / exhaust hole.

Description

Exhaust Gas Purification Apparatus for Invehicle using Diesel Fuel}

1 is a schematic configuration diagram of a diesel particulate smoke purifying apparatus according to the prior art,

2 is a schematic configuration diagram of a diesel particulate purification apparatus according to the present invention,

Figure 3 is a schematic perspective view showing a soot adsorber according to the present invention,

4 is a front view showing a soot adsorber according to the present invention;

Figure 5 is a schematic side cross-sectional view showing a soot adsorber according to the present invention.

*** Explanation of symbols for main parts of drawing ***

10: soot purifier,

30: exhaust manifold,

40: exhaust pipe,

50: case,

60: soot adsorber,

61: wire mesh,

62: suction member,

62a: intake air,

63: discharge member,

63a: vent hole,

70: diesel oxidation catalyst device,

80: air resonator,

90: Muffler.

The present invention relates to a soot purification apparatus for a diesel vehicle, and more particularly, by installing a soot absorber between exhaust pipes at the tip of a diesel oxidation catalyst device, soot in low and low temperature ranges where natural regeneration is difficult regardless of the conditions of small or large vehicles. Can be easily adsorbed and naturally regenerates the soot adsorbed in the high speed and high temperature ranges where natural regeneration is desired, thereby activating the oxidation catalyst function of the latter stage, as well as expanding the performance of the soot purifier and the application range of the DPF system. The present invention relates to a diesel vehicle soot purifying apparatus capable of efficiently reducing back pressure and increasing power and fuel efficiency.

In general, diesel engines using diesel as a raw material have good thermal efficiency and low fuel cost, and thus are mainly used in vehicles or devices requiring large force such as trucks.

However, since diesel engines have good thermal efficiency and emit large amounts of particulate pollutants such as smoke, there is a problem in that they are not free from regulations on air pollution in recent years.

Exhaust gases of diesel vehicles include carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOx), sulfur oxides and particulate matter (Particulate Matter, PM). Particularly, the particulate matter increases the generation of suspended dust. It is becoming a major cause of air pollution.

Accordingly, in recent years, as the demand for a pleasant environment of humans and the environmental regulations of each country are combined, regulations on the air pollutants contained in the exhaust gas are increasingly severe, and various exhaust gas filtration methods have been studied as a countermeasure.

In other words, engine technology and pre-treatment technology have been developed as a technology for reducing pollutants in the engine itself, but as the exhaust regulations are strengthened, only the harmful gas reduction technology in the engine has a limit to satisfy regulations. Application of aftertreatment technology to treat already burned exhaust gases has become inevitable.

Examples of post-treatment technologies for diesel vehicles include oxidation catalysts, nitrogen oxide catalysts, and soot filtration devices. Among them, the particulate matter reduction technology, which is approaching the most efficient and practical use, is a diesel particulate filter filter (DPF). to be.

Such a soot filtration device collects particulate matter discharged from a diesel engine with a filter, burns it (hereinafter referred to as regeneration), and collects particulate matter and continues to use it. It is very excellent in terms of durability, but durability and economy are acting as obstacles to practical use.

Recycling particulate matter of diesel cars is a passive type in which regeneration is performed only by exhaust gas without supplying a separate heat source, and a forced regeneration method in which a particulate material is combusted by forcibly supplying a heat source chemically or electrically ( Active type).

Here, the natural regeneration method is a fuel additive, platinum, etc. to lower the regeneration temperature of particulate matter by mixing metal materials such as iron (Fe), cerium (Ce), copper (Cu), platinum (Pt) and the like. The catalyst filter (Catalyst filter trap) for burning particulate matter by coating the noble metal of the filter on the surface of the filter, and the catalyst-trap combinations (catalyst-trap combinations) to install the catalyst in the front, and the filter in the rear.

In addition, the forced regeneration method collects particulate matter through a filtration filter and then directly burns the particulate matter through a burner or an electric heater or heats it to a temperature at which it can be burned. Due to severe failure and high price, the commercialization is delayed.

In the particulate matter purification apparatus for a diesel vehicle described later in the present specification, an example of a natural regeneration method of a diesel oxidation catalyst device will be briefly described, but it can be applied to a configuration for a forced regeneration method.

As illustrated in FIG. 1, the exhaust gas purifying apparatus 110 for a diesel vehicle according to the related art includes an exhaust manifold 130 connected through a plurality of cylinders configured in the diesel engine 120, and the exhaust manifold ( 130 is connected to the exhaust pipe 140 is extended to the rear, the diesel oxidation catalyst device 170, the air resonator (Resonator, 180) and the muffler (Muffler, 190) which are connected sequentially provided between each of the exhaust pipe (140) Consists of

Hereinafter, a brief description will be given of the movement path of the soot according to the configuration of the soot purification apparatus 110 for diesel vehicles.

First, the soot discharged from the exhaust manifold 130 moves through the hollow exhaust pipe 140. The exhaust pipe 140 extends along the length direction and filters soot while passing through the diesel oxidation catalyst device 170 installed therebetween.

Here, the diesel oxidation catalyst device 170 includes a filtration filter for collecting particulate matter contained in the exhaust gas therein.

Then, the soot filtered out of the diesel oxidation catalyst device 170 is moved through the interior of the exhaust pipe 140 is extended and passes through an air resonator (Resonator, 180). The air resonator 180 is a device for reducing the noise generated when the air intake, serves to block the noise at low speed and acceleration. Subsequently, the smoke that has passed through the air resonator 180 is discharged to the outside through the muffler 190 which is moved along the exhaust pipe and finally makes noise dispersion.

In general, the conventional diesel vehicle soot purifying apparatus 110, in the case of large vehicles, the exhaust gas temperature is high, the continuous regeneration can be performed by a natural regeneration method using a catalyst or additive, so that a separate heat source supply is not required, The soot post-treatment device, that is, the DPF system is applied. In addition, in the case of small vehicles, since the exhaust gas temperature is about 100 ° C. lower than that of the heavy vehicle, it is not possible to continuously reproduce the fuel without an additional auxiliary heat source.

In particular, the DPF system is difficult to apply due to the low exhaust gas temperature to be applied to small vehicles, and the scope of application is limited in large vehicles. The oxidation catalyst device is applied to small vehicles, but the reduction efficiency of smoke is quite significant. The efficiency was dependent on the condition of the vehicle and the exhaust conditions.

That is, these problems are difficult to form the conditions necessary for the natural oxidation of the smoke, there is a problem that it is difficult to apply the expensive device to the small vehicle, the purification of the smoke sufficiently in each given operating conditions.

The present invention has been made to solve the above problems, by providing a soot adsorber between the exhaust pipe of the diesel oxidation catalyst device end so that the adsorption of soot in the low and low temperature section is difficult to natural regeneration regardless of the conditions of small or large vehicles. Easily and naturally regenerates the soot adsorbed in the high-speed and high-temperature sections where natural regeneration is desired, thereby activating the oxidation catalyst function in the rear stage, as well as reducing the back pressure of the engine by expanding the performance of the soot purifier and DPF system. The purpose is to increase the output and fuel economy efficiently.

According to the exhaust gas purifying apparatus for diesel vehicles of the present invention devised to achieve the object as described above, an exhaust manifold connected through a plurality of cylinders configured in the diesel engine, and an exhaust pipe connected to the exhaust manifold and extended backward; In the exhaust gas purification device for a diesel vehicle comprising a diesel oxidation catalyst device, an air resonator and a muffler connected to each other between the exhaust pipes sequentially, the exhaust gas is disposed between exhaust pipes at the tip of the diesel oxidation catalyst device. A case is installed, and the inside of the case is equipped with a soot adsorber capable of absorbing and oxidizing soot discharged from the engine.

The soot adsorber has a cylindrical shape and extends in the longitudinal direction to form a plurality of lattice shapes, a disk-shaped suction member provided to correspond to one end of the wire mesh, and the wire mesh. The other end includes a discharge member provided in the same shape as the suction member.

In addition, the wire mesh, it is preferable that the coating is formed of a stainless steel (Steainless Steel) material having an adhesive.

In addition, the suction and discharge members are provided with a plurality of suction and exhaust holes at regular intervals or at regular intervals in a central portion and radially.

In addition, the suction and exhaust holes of the suction and discharge members are variable in their positions and shapes.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic configuration diagram of a diesel particulate purification apparatus according to the present invention, Figure 3 is a schematic perspective view showing a soot adsorber according to the present invention, Figure 4 is a front view showing a soot adsorber according to the present invention, Figure 5 Is a schematic side cross-sectional view showing a soot adsorber according to the present invention.

In the smoke purification apparatus for a diesel vehicle according to the present invention, as shown in Figure 2 is connected to the exhaust manifold 30 and the exhaust manifold 30 connected through a plurality of cylinders configured in the diesel engine 20 Since the diesel oxidation catalyst device 70, the air resonator 80, the muffler 90, and the like, which are sequentially connected to each other between the exhaust pipe 40 and the exhaust pipe 40 extending backward, are the same as in the related art, Detailed description of the configuration will be omitted.

The particulate matter purification apparatus for a diesel vehicle according to the present invention is provided with a hollow case 50 between exhaust pipes 40 at the tip of the diesel oxidation catalyst device 70, and includes a soot absorber 60 therein. Doing.

As shown in FIGS. 3 to 5, the soot adsorber 60 includes a wire mesh 61, a suction member 62, and a discharge member 63.

The wire mesh 61 is cylindrical and extends in the longitudinal direction to form a plurality of grids. In particular, the wire mesh 61 is preferably formed of a coating of a stainless steel material having a tacky.

At one end and the other end of the wire mesh 61, disc-shaped suction / discharge members 62 and 63 are provided to correspond in the same shape.

The suction and discharge members 62 and 63 are provided with a plurality of regular or irregular suction and exhaust holes 62a and 63a which are spaced apart at predetermined intervals from the center portion and radially. That is, the intake / exhaust holes 62a, 63a formed in the intake / discharge members 62, 63 can be variously changed according to their position and shape.

In addition, although not shown in the drawings in another embodiment, when the front of the inlet and outlet of the wire mesh 61 is opened, the flow resistance of the smoke is reduced to reduce the back pressure of the engine.

Hereinafter, the purifying action of the soot adsorber 60 in the soot purification apparatus 10 for diesel vehicles according to the present invention will be described.

First, the exhaust gas discharged from the exhaust manifold 30 moves through the hollow exhaust pipe 40 extending along the longitudinal direction.

Then, the soot is preferentially passed through the soot adsorber 60 provided in the hollow case 50. Here, the soot is introduced through the intake hole (62a) of the suction member 62 provided on one side of the soot adsorber (60).

The soot flowing through the intake hole 62a is adsorbed by the wire mesh 61 having a lattice shape at a low temperature and a low speed, and naturally regenerates and purifies the soot adsorbed at a high temperature and a high speed.

Alternatively, the soot is adsorbed at the same time as the natural regeneration is carried out through the exhaust hole (63a) of the discharge member 63 provided on the other side of the soot adsorber 60 is moved through the communicating exhaust pipe (40). The soot thus moved is partially filtered by the diesel oxidation catalyst device 70 and finally discharged to the outside through the muffler 90 while passing through the air resonator 80.

Although the preferred embodiments of the present invention have been described above, the scope of the present invention is not limited to such specific embodiments, and those skilled in the art may appropriately change within the scope described in the claims of the present invention. This will be possible.

As described above, according to the soot purification apparatus for diesel vehicles according to the present invention, a soot adsorber is installed between exhaust pipes at the tip of the diesel oxidation catalyst device, so that a low speed and low temperature section is difficult to regenerate naturally regardless of the conditions of a small or large vehicle. Adsorbs soot in the high speed and high temperature range where natural regeneration is desired, activates the oxidation catalyst function in the rear stage, and expands the performance of the soot purifier and the application range of the DPF system. It has the effect of reducing and efficiently raising the output and fuel economy.

Claims (5)

An exhaust manifold 30 connected through a plurality of cylinders configured in the diesel engine 20, an exhaust pipe 40 connected to the exhaust manifold 30 to be extended rearward, and connected between the exhaust pipes 40, respectively. In the diesel vehicle soot purifying apparatus (10) comprising a diesel oxidation catalyst device (70), an air resonator (80) and a muffler (90), which are sequentially provided, A hollow case 50 is installed between the exhaust pipes 40 at the tip of the diesel oxidation catalyst device 70, and a soot absorber 60 capable of absorbing and oxidizing soot discharged from the engine is provided inside the case 50. A soot purification device for a diesel vehicle, characterized in that it is equipped with mounting. The method of claim 1, The soot adsorber 60 is cylindrical and extends in the longitudinal direction to form a plurality of lattice-shaped wire meshes 61, and a disc-shaped suction member 62 provided to correspond to one end of the wire mesh 61. The other end of the wire mesh 61, the exhaust gas purification device for a diesel vehicle, characterized in that it comprises a discharge member (63) provided in the same shape as the suction member (62). The method of claim 2, The wire mesh 61 is a soot purification device for diesel vehicles, characterized in that the coating is formed of a sticky stainless steel (Steainless Steel) material. The method of claim 3, The suction / discharge member (62, 63) is a soot and exhaust gas purification device for diesel vehicles, characterized in that a plurality of regular or irregular inlet and exhaust holes (62a, 63a) spaced at predetermined intervals in the center and radial. The method of claim 4, wherein The intake and exhaust holes (62a, 63a) of the intake and exhaust member (62, 63) is a soot purification apparatus for diesel vehicles, characterized in that the position and shape can be varied in various ways.

Images