KR19990032042A - Soot emission reduction device of internal combustion engine - Google Patents

Abstract

It is an object of the present invention to provide a smoke emission reduction device having a structure that can greatly increase the combustion efficiency of the soot particles contained in the exhaust gas discharged from the internal combustion engine.

To this end, the present invention is a smoke emission reduction device for burning the exhaust particles in the exhaust gas discharged from the internal combustion engine by a plurality of heated combustion mesh to discharge the exhaust gas from the internal combustion engine,

It is characterized in that it comprises a vortex generator having a plurality of guide vanes for guiding the flow of exhaust gas flowing in a straight line along the exhaust system spirally along the outer surface of the combustion wire mesh.

Description

Soot emission reduction device of internal combustion engine

The present invention relates to a smoke emission reduction device of an internal combustion engine that burns and removes soot contained in exhaust gas discharged from an internal combustion engine.

Exhaust gases emitted from internal combustion engines powered by the combustion of fuels such as gasoline and diesel oil contain harmful components such as CO, HC, NOx and soot (unburned soot particles). Causes pollution and harms the human body.

For this reason, a catalytic converter is installed in the exhaust pipe or in the exhaust manifold to purify the exhaust gas.

As the catalytic converter, a pellet type in which a catalyzing substance is attached to granular alumina having a diameter of 2 to 4 mm called pellets or a monolith type in which a catalyzing substance is attached to lattice alumina is usually used. By using a noble metal such as this to cause a catalytic reaction, CO, HC, and NOx, which are harmful component gases in the exhaust gas, are oxidized and reduced to harmless CO ₂ , H ₂ O, and N _{2, respectively} . Soot particles in the combustion state are discharged as they are, or stuck to the lattice-like alumina surface, so that the emission is partially suppressed.

As the soot particles adhere to the lattice-like alumina surface of the catalytic converter, it is possible to expect the effect of reducing soot emissions to a certain extent. In order to cause engine failure, a secondary combustion device is usually installed in front of the catalytic converter to burn off soot particles separately.

However, the combustion treatment method of injecting a small amount of fuel into the exhaust pipe and burning it by exhaust gas heat to burn off soot particles has a problem in that its structure is complicated, its installation cost is excessive, and its economic efficiency is low. As shown in FIG. A soot discharge reducer 51 having a plurality of wire meshes 50 is attached to the exhaust manifold to reduce soot emissions.

The smoke exhaust reducer 51 of the illustrated wire mesh structure is applied to an internal combustion engine that is generalized to a burner and the like, soot particles exhausted by exhausting the wire mesh 50 to be red by heat of exhaust gas at a high temperature (usually 400 ° C. to 900 ° C.). When they hit the surface of the wire mesh 50, the secondary combustion by the heat is brought to reduce the emissions of soot particles.

However, according to the above structure, the installation cost is very low and widely used. However, since the width × length of the mesh body is larger than 1 mm x 1 mm, the soot particles are very small, so that the amount of soot particles passes through the wire mesh without being hit by the surface of the mesh. The problem of poor efficiency remains a disadvantage.

Therefore, the present invention has been proposed in view of the above problems, and its object is to

It is to provide a smoke emission reduction device having a structure that can greatly increase the combustion efficiency of the soot particles contained in the exhaust gas discharged from the internal combustion engine.

The present invention to achieve the above object

In the exhaust emission reduction device which is mounted on the exhaust system and burns soot particles in the exhaust gas discharged from the internal combustion engine by means of a plurality of heated combustion meshes.

It characterized in that it comprises a vortex generator having a plurality of guide wings for guiding the flow of exhaust gas flowing in a straight line along the exhaust system in a spiral along the outer surface of the combustion wire mesh.

According to the above structure, the exhaust gas flowing in a straight line through the exhaust system does not pass through the mesh body of the wire mesh (square hole formed by the wire) as it is, and is spirally similarly along the outer surface of the conical wire mesh according to the guidance of the plurality of guide vanes. Since the contact rate is greatly improved by the collision between the surface of the combustion wire mesh and the soot particles contained in the exhaust gas, the soot particles are completely burned.

1 is a longitudinal sectional view showing a smoke emission reduction apparatus of an internal combustion engine according to the present invention.

Figure 2 is an exploded perspective view of the exhaust emissions reduction device of the internal combustion engine according to the present invention.

3 is a plan view of the vortex generator of the present invention.

Figure 4 is a view showing the formation of the guide blade of the present invention vortex generator.

5 is a front sectional view showing a first combusted wire mesh of the present invention.

6 is a plan view of a bypass vortex generator mounted at the tip of the bypass tube.

7 is an enlarged view of a portion of the combustion mesh.

8 is a perspective view showing a conventional smoke emission reducing device.

※ Explanation of code for main part of drawing

1,2,3,4,5,6,7: Combustion wire mesh 8: Vortex generator

9: circular hole 10: flange

11: guide wing 12: central protrusion

13: incision line 14: air passage

15 hole 16: bypass tube

17: Vortex generator for bypass 18: Guide wing

19: air passage 20: rear outlet

21: bypass hole 22: vortex generator

23: bypass hole 25: flange

26: preheated wire mesh 27, 28: fixed flange

29: exhaust manifold 30: exhaust pipe

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

The exhaust emission reduction device of the present invention, denoted by reference numeral A in FIG. 1, includes a plurality of combustion wire meshes (1) (2) (3) (4) (5) (6) (7) and a vortex generator (8). Although the contours of the combustion wire meshes 1 to 7 are shown in cross-section with a thickness in order to avoid the complexity, the actual shape thereof is shown in the parts exploded perspective view of FIG.

The number of installations of the combustion wire meshes 1 to 7 is not particularly limited, but if the number of the combustion wire meshes 1 to 7 is too high, the number of combustion wire meshes 1 to 7 is preferably increased, so that the back pressure is increased. Of the second burned wire mesh (2), the third burned wire mesh (3), the fourth burned wire mesh (4), the fifth burned wire mesh (5), the sixth burned wire mesh (6) and the seventh burned wire mesh (7). It is composed of dogs, and their shape is raised so as to protrude convexly from the center to form a substantially conical shape.

Each of the combustion wire meshes are made by weaving steel wires such as 0.3 mm to 0.8 mm in length and width, and the horizontal length of the mesh body (hole) formed by the wire is (0.5 to 1.3) mm × (0.5 to 1.3) mm. The shape of the mesh hole is a quadrilateral or rhombus.

The vortex generator 8 covers the outer side of the first burned wire mesh 1 having the circular hole 9 formed in the apex, that is, the front close to the engine side.

The overall shape of the vortex generator 8 is a hat shape and is composed of a flange 10 of a flat plate and a central protrusion 12 having a plurality of guide vanes 11.

The guide blade 11 is formed by drawing a processing to draw a central portion of the plate like a mountain peak, and then made into a hat shape and then cut the projected portion radially from the center portion and then twist the plate between the incision line 13 , Air passage hole 14 is formed between the twisted guide blades (11). The air passage hole 14 formed between the guide vanes 11 is helically guided so that the exhaust gas having a property of flowing in the straight line inside the exhaust system flows on the outer surface of the first combustion wire mesh 1.

A hole 15 is formed in the protruding center apex of the vortex generator 8, and the bypass pipe 16 is mounted in the hole 15.

The bypass pipe 16 has a funnel-shaped cross section, and a bypass vortex generator 17 for exhaust gas is provided at the front end thereof.

The basic configuration and principle of the bypass vortex generator 17 are also the same as those of the vortex generator 8 described above, and the disc member is radially cut to open one side of the guide blade 18 at an oblique angle to open the air passage hole. 19, exhaust gas passing through the air passage hole 19 passes through the bypass pipe 16 while spirally turning.

The first combustion wire mesh (1) conical shape is installed in the rear (term of definition: the front means the side closer to the engine, the rear means the side away from the engine, the rear means the lower side based on the condition shown in Figure 1). The apex portion 2a of the second combusted wire mesh 2 is located near the rear end outlet 20 of the bypass pipe 16, and the exhaust gas is not smooth and the exhaust gas is easily discharged when excessive back pressure is applied. A plurality of bypass holes 21 are formed in the second burned wire mesh 2.

The third and fourth burned wire meshes 3 and 4 are arranged one after the other, and the basic shape is similar to the first burned wire mesh 1 with holes 9.

A vortex generator 22 having the same structure as the vortex generator 8 is located behind the fourth burned wire mesh 4, and a sixth burned wire mesh 6 is provided to the rear thereof, and a rear vortex generator 22 is provided. And the fifth burned wire mesh 5 are interposed between the sixth burned wire mesh 6 and the sixth burned wire mesh 6.

The central portion 5a of the fifth burned wire mesh 5 positioned behind the central hole 15 of the rear side vortex generator 22 protrudes convexly toward the central hole 15 and is provided in the outer peripheral side of the central portion 5a. Of the bypass holes 23 are drilled.

And the seventh combustion wire mesh 7 with a flange 24 is provided so as to surround the rear, and the preheated wire mesh 26 with the flange 25 is located in front of the front vortex generator 8.

After assembling the combustion wire meshes 1 to 7 and the preheated wire meshes 26 in order, the flanges 10, 10, 24, and 25 are combined to be fixed by the front and rear fixing flanges 27 and 28. Assemble

The present invention having such a configuration is used by inserting the exhaust system, particularly the connection between the exhaust manifold 29 and the flanges 31 and 32 of the exhaust pipe 30.

Hereinafter, the soot combustion process according to the present invention will be described.

When the engine is driven and the high-temperature exhaust gas is discharged through the exhaust system (exhaust manifold, exhaust pipe), the preheated wire mesh 26 and the respective combustion wire meshes 1 to 7 are heated and heated red by the exhaust gas heat.

The exhaust gas first passes through the preheated wire mesh 26 while flowing in a straight line through the exhaust manifold 29, and in the process, the particulate matter in the exhaust gas is heated to a state in which combustion can easily occur.

The soot particles of the preheated exhaust gas do not pass straight through the front vortex generator 8, but pass through the air passage hole 14 according to the guide blades 11 twisted at an angle, and thus the air passage hole. Air passing through (14) flows helically along the conical outer surface of the first burned wire mesh (1).

Therefore, when looking at the first combustion wire mesh 1 in the exhaust gas flow direction, the mesh body 35 which is a hole (a quadrangular or rhombus hole) formed between the iron wires 33 and 34 is not visible.

This is an important feature of the present invention means that the soot particles entering the first combustion wire mesh (1) can not escape through the mesh body space 35 as it is forced to hit the wire mesh as a possibility of combustion of the soot particles Greatly improved.

A large amount of the soot particles contained in the exhaust gas is hit by the first combustion mesh 1 and burned first, and the remaining unburned particulates pass through the second, third and fourth combustion meshes 2-4. Secondary combustion.

The exhaust gas passing through the fourth combustion mesh 4 loses its spiral turning force and tries to flow in a straight line due to the exhaust gas pressure. However, the inner surface of the sixth combustion mesh 6 is opened by the vortex generator 22 at the rear thereof. It is induced to flow along, and the residual soot particles are also burned while passing through the sixth and sixth combustion meshes (6) and the seventh combustion meshes (7), and discharged to the outside through the exhaust pipe (30), thereby greatly increasing the atmospheric emissions of the particulates. Can be reduced.

On the other hand, when the back pressure is increased by these wire meshes 1 to 7 and 26 and the vortex generators 8 and 22 to make it difficult to smoothly discharge the exhaust gas, the exhaust gas is discharged through the center portion of the apparatus along the bypass pipe 16. In this case, the bypass pipe 16 is spirally rotated by the guide vane 18 of the bypass vortex generator 17 to pass through the outlet 20, and the second combustion wire mesh 2 It passes through the outer circumferential surface of the protruding portion 2b, which does not pass through the vertex portion 2a in a spiral manner, so that the combustion effect of the soot particles is increased, and the exhaust gas having a high back pressure causes the bypass hole 21 to pass through. Go backward through.

At this time, the collision effect with the exhaust gas flowing through the first combustion wire mesh (1) is increased by the contact effect with the third combustion wire mesh (3) is further increased, the exhaust gas discharged through the central passage 36 is again made Combustion of the soot particles occurs while hitting the protrusions 5a of the five combusted wire mesh 5 and is discharged backward through the bypass hole 23.

The present invention as described above provides a vortex generator before and after the combustion wire mesh installed in the exhaust system so that the soot particles in the exhaust gas hit the combustion, the flow direction is changed when the exhaust gas flowing in a straight line passes through the vortex generator to the outside of the combustion wire mesh By guiding the spiral vortex flow to flow along the surface, soot particles collide with the combustion wire mesh to greatly increase the efficiency of combustion, thereby preventing environmental pollution.

Claims (7)

In the exhaust emission reduction device which is mounted on the exhaust system and burns soot particles in the exhaust gas discharged from the internal combustion engine by means of a plurality of heated combustion meshes. And a vortex generator having a plurality of guide vanes for guiding the flow of exhaust gas flowing in a straight line along the exhaust system to flow helically along the outer surface of the combustion wire mesh. The method of claim 1, The vortex generator has a cap shape consisting of a flange and a protrusion that rises toward the center of the flange, and the guide blade radially cuts the protruding portion and twists the cut sheet portion in one direction to induce the flow of exhaust gas in a spiral manner. Soot emission reduction device of an internal combustion engine, characterized in that to form an air passing hole. The method of claim 2, The exhaust gas passing through the vortex generator is induced to flow along the outer surface of the first combustion wire mesh of the conical shape, and guides the exhaust gas to be smoothly discharged when the back pressure is excessively increased in the center of the vortex generator and the first combustion wire mesh. The exhaust emission reduction device of the internal combustion engine, characterized in that the bypass pipe is installed. The method of claim 3, wherein In front of the bypass pipe is provided with a vortex generator to guide the exhaust gas into the spiral, The second combustion wire mesh of the conical shape is arranged behind the first combustion wire mesh, the apex of the second combustion wire mesh is located near the rear end discharge port of the bypass pipe, characterized in that a plurality of bypass holes are formed Soot emission reduction device. The method of claim 4, wherein A vortex generator for guiding the flow of exhaust gas helically behind the second combusted wire mesh and a sixth conical six meshed wire mesh are provided so that the exhaust gas passing through the vortex generator flows along the inner surface of the sixth combusted wire mesh. Soot emission reduction device of the internal combustion engine, characterized in that induced by. The method of claim 5, An apparatus for reducing exhaust emissions of an internal combustion engine, characterized in that at least one combustion wire mesh is provided between the second combustion wire mesh and the vortex generator installed at the rear side thereof, and the rear vortex generator and the sixth combustion mesh. . The method of claim 1, And a preheated wire mesh for preheating the exhaust gas in order to promote combustion of the soot particles in front of the front side vortex generator.