KR101218587B1 - Exhaust gas reduction apparatus comprising electric heating type foam filter - Google Patents

Abstract

PURPOSE: A smoke reducing device with an electrically heating foam filter is provided to maintain the temperature of a catalyst over activation temperature. CONSTITUTION: A smoke reducing device(100) with an electrically heating foam filter comprises an insulating body(111), a heating foam filter(130), and a collecting foam filter(150). Exhaust gas discharged from an internal combustion engine flows in and out of the insulating body. The exhaust gas is discharged to the outside through a plurality of exhaust holes. Harmful matters in the exhaust gas discharged through the exhaust holes are converted into harmless matters by a catalytic action. A surface of the heating foam filter is coated with a catalyst, and the catalyst is heated by electricity. The collecting foam filter collects particle matters in the exhaust gas discharged through the heating foam filter.

Description

Soot reduction device including electric heating foam filter {EXHAUST GAS REDUCTION APPARATUS COMPRISING ELECTRIC HEATING TYPE FOAM FILTER}

The present invention relates to a smoke reduction device, and more particularly, to a smoke reduction device comprising an electric heating type filter.

In an internal combustion engine, incomplete combustion of the fuel occurs due to inconsistency in the ratio of air and fuel, unevenness of the air fuel mixer, and structural problems in the combustion chamber when the fuel is combusted. Contains several hazardous substances.

Therefore, research on an apparatus or method for removing these harmful substances is actively progressing. In particular, in the diesel engine vehicle, an exhaust gas filtration device or a post-treatment device such as a diesel particulate filter (DPF) device or a diesel oxidation catalyst (DOC) device is used.

The catalyst for reducing smoke is based on the fact that harmful substances in exhaust gases emitted from internal combustion engines are converted into harmless substances by oxidation or reduction of the catalyst. In order for the catalyst to function, a temperature above the catalyst activation temperature is required, and this temperature is generally referred to as a reaction start temperature. In the catalyst, the reaction does not occur at all when the ambient temperature is lower than the reaction start temperature, and as the temperature increases above the reaction start temperature, the reaction rate increases, and the reaction rate reaches a maximum at a specific temperature, and then the reaction rate decreases.

However, the composition and temperature of the exhaust gas discharged from the internal combustion engine change depending on the operating conditions. In the idling or low load region, the exhaust gas temperature is lower than the reaction start temperature of the catalyst, so the exhaust gas is not purified and is mostly discharged into the atmosphere. There is an outgoing issue. Therefore, in the case of a vehicle internal combustion engine, although exhaust gas is intensively discharged for a predetermined time from the start, the catalyst reaction does not occur because the catalyst reaction start temperature is lowered. Since the amount of exhaust gas is smaller than the amount of exhaust gas, there is a problem that smoke reduction is inefficient.

Embodiments of the present invention to provide a soot reduction device that can maintain the catalyst above the activation temperature irrespective of the exhaust gas temperature.

According to an aspect of the present invention, a smoke reduction device for reducing the exhaust gas of the internal combustion engine, the exhaust body discharged from the internal combustion engine inlet and outflow; A foam filter for heating that is formed on an outer surface of the insulating body and generates heat by electricity; And a collection foam filter for accommodating the heating foam filter therein.

In this case, the insulating body may be characterized in that it comprises a flange portion formed on at least one end.

On the other hand, the heating foam filter may be made of a metal selected from aluminum, silver, nickel, copper, iron, titanium, palladium, chromium and alloys thereof.

In addition, the heating foam filter is coated with a catalyst, the catalyst may be characterized in that selected from platinum, rhodium, palladium and combinations thereof.

On the other hand, the insulating body is formed in the form of a hollow tube, the heating foam filter may be attached to spirally wound around the insulating body.

In addition, a plurality of grooves may be formed in the insulating body, and the heating foam filter may be fitted into the grooves.

In addition, the heating foam filter may be attached to the plurality of spaced apart at predetermined intervals in the longitudinal direction of the insulating body.

In addition, the heating foam filter may be provided with at least one contact portion, it may be characterized in that it is energized through the contact portion.

According to another aspect of the present invention, a smoke reduction device for reducing the exhaust gas of the internal combustion engine, the exhaust gas discharged from the internal combustion engine inlet and outflow; A heating foam filter disposed in the insulation body in a direction perpendicular to the flow direction of the exhaust gas and generating heat by electricity; And a soot filtration filter disposed behind the heating foam filter.

In this case, the heating foam filter may be made of a metal selected from aluminum, silver, nickel, copper, iron, titanium, palladium, chromium and alloys thereof.

In addition, the heating foam filter is coated with a catalyst, the catalyst may be characterized in that selected from platinum, rhodium, palladium and combinations thereof.

In addition, the heating foam filter may be provided with at least one contact portion, it may be characterized in that it is energized through the contact portion.

In embodiments of the present invention, by arranging a heating foam filter that generates heat by electricity in the smoke reduction device, the catalyst may be maintained above the activation temperature regardless of the exhaust gas temperature.

Therefore, it is possible to effectively reduce the harmful substances in the exhaust gas regardless of the operating conditions of the internal combustion engine.

1 is an exploded view schematically showing a smoke reduction device according to an embodiment of the present invention.
Figure 2 is a perspective view of the smoke reduction device of FIG.
3 is a cross-sectional view of the smoke reduction device of FIG.
FIG. 4 is a view schematically illustrating a smoke reduction device in which a heating foam filter is disposed in another form in FIG. 1.
5 is a view schematically showing a smoke reduction device according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail.

1 is an exploded view schematically showing a smoke reduction device 100 according to an embodiment of the present invention, FIG. 2 is a perspective view of the smoke reduction device 100 of FIG. 1, and FIG. 3 is a smoke reduction device of FIG. 2. 100 is a cross-sectional view.

1 to 3, the smoke reduction device 100 serves to reduce the exhaust gas of the internal combustion engine, it may be connected to the engine exhaust pipe (not shown) of the internal combustion engine. Alternatively, the smoke reduction device 100 may be disposed in an aftertreatment device (not shown) connected to the engine exhaust pipe of the internal combustion engine.

The smoke reduction device 100 includes an insulation body 110, a heating foam filter 130, and a collecting foam filter 150.

The insulation body 110 forms the body of the smoke reduction device 100, and exhaust gas discharged from the internal combustion engine is introduced into and discharged from the inside. Specifically, the exhaust gas discharged from the internal combustion engine may be introduced into one end of the insulating body 110 and discharged into the other end. In addition, the insulating body 110 is formed with a plurality of discharge holes (not shown) in the body so that the exhaust gas is discharged to the outside while passing through the inside. The discharge hole is sufficient as long as the exhaust gas can be discharged, and the size and shape are not limited.

The insulating body 110 may be formed using a plastic or ceramic having heat resistance and insulating properties, and the plastic or ceramic material is not limited to a specific material.

The size or shape of the insulating body 110 is not limited. For example, the insulating body 110 may be formed in a size that can be connected to the engine exhaust pipe of the internal combustion engine or a size that can be disposed inside the aftertreatment device connected to the engine exhaust pipe of the internal combustion engine. In addition, the insulating body 110 may be formed in a hollow tube shape, but is not limited thereto. However, for convenience of description, the following description will focus on the case where the insulating body 110 is formed in a hollow tube shape.

The insulating body 110 may include a flange portion 111. The flange part 111 may serve to fix the insulating body 111 to a portion where the smoke reducing device 100 is disposed, and the heating foam filter 130 and the collecting material formed on the insulating body 111. The foam filter 150 may serve to prevent the foam filter 150 from being pushed forward or backward.

The flange portion 111 may be formed at at least one end of the insulating body 110. For example, the flange portion 111 may be formed at the front end or the rear end of the insulating body 110, and may be formed at both the front end and the rear end. However, for convenience of description, hereinafter, the flange 111 will be described based on the case formed at the front end of the insulating body 110. 1 and 2 also show a case in which the flange portion 111 is formed at the front end (left side) of the insulating body 110.

The heating foam filter 130 is formed on the outer surface of the insulating body 110 and may generate heat by electricity. The heating foam filter 130 is made of a metal, and the metal is not limited. For example, the heating foam filter 130 may be made of a metal selected from aluminum, silver, nickel, copper, iron, titanium, palladium, chromium, and alloys thereof.

The heating foam filter 130 may be coated with a catalyst. The catalyst serves to convert some of the carbon monoxide, hydrocarbons and nitrogen oxides contained in the exhaust gas into harmless carbon dioxide, moisture, nitrogen, and the like. Such a catalyst may be an oxidation catalyst or a reduction catalyst, and the kind thereof is not limited. For example, the catalyst may include platinum, rhodium, palladium, or a combination thereof, but is not limited thereto.

The size or shape of the heating foam filter 130 is not limited. For example, the heating foam filter 130 may be manufactured in a sheet form, or may be manufactured in a band form. In addition, the heating foam filter 130 may be manufactured in the form of a plurality of bands, in which case each band may be formed to have a uniform width and thickness.

When the heating foam filter 130 is manufactured in a sheet form, the heating foam filter 130 may be disposed to surround the surface of the insulating body 110. On the other hand, when the heating foam filter 130 is manufactured in the form of a band, the heating foam filter 130 may be arranged to surround the surface of the insulating body 110 with a plurality of bands.

It is also possible to manufacture the heating foam filter 130 in the form of a long strip. In this case, the heating foam filter 130 may be attached to spirally surround the circumference of the insulating body 110 as shown in FIG. 1. At this time, a known adhesive or the like can be used for the attachment.

In addition, it is also possible to form the groove 113 on the surface of the insulating body 110 for the placement of the heating foam filter 130. For example, the groove 113 may be formed in a portion where the heating foam filter 130 is disposed on the insulating body 110, and the heating foam filter 130 may be fitted into the groove 113. .

In addition, it is also possible to form the heating foam filter 130 by laminating on the surface of the insulating body (110). For example, the heating foam filter 130 may be primarily wrapped and disposed on the surface of the insulating body 110, and the other heating foam filter 130 may be secondly wrapped and disposed thereon. That is, the heating foam filter 130 may be disposed in any form on the insulating body 110.

On the other hand, the heating foam filter 130 may be provided with at least one contact portion 131. The contact unit 131 may serve to supply electricity to the heating foam filter 130 by connecting the heating foam filter 130 and a power supply (not shown).

Accordingly, the heating foam filter 130 may generate heat by being supplied with electricity through the contact portion 131, and the temperature rises to the catalyst activation temperature regardless of the operating conditions of the internal combustion engine or the temperature of the exhaust gas due to the heat generation. This is possible. Alternatively, a known reducing agent or additive may be added for a more smooth catalytic reaction, and at this time, the temperature may be increased by using the heating foam filter 130 for evaporation of the reducing agent or additive.

The contact portion 131 may be formed at one end of the heating foam filter 130, and in the case where there are a plurality of heating foam filters 130, the contact portion 131 is formed for each heating foam filter 130. It is also possible. In the case where the heating foam filter 130 and the contact portion 131 are plural, it is possible to heat the plurality of heating foam filters 130 in a specific order.

In this regard, FIG. 4 is a view schematically illustrating a smoke reduction device 100 in which the heating foam filter 130 is disposed in another form in FIG. 1.

Referring to FIG. 4, the heating foam filter 130 may be formed in a band shape, and a plurality of such band-shaped heating foam filters 130 may be attached to the insulating body 110 in the length direction. At this time, each heating foam filter 130 may be formed to have the same width and length, it is possible to be attached to the insulating body 110 at a predetermined interval spaced apart. In addition, a contact portion 131 may be formed at one end of each heating foam filter 130. At this time, each contact portion 131 may be connected to the electric line separately or connected to the electric line while the two or more contact portion 131 is connected. Therefore, the heating order or form of the heating foam filter 130 may vary according to the arrangement and the connection state of the contact portion 131.

The collecting foam filter 150 accommodates the heating foam filter 130 therein and serves to capture particulate matter contained in the exhaust gas passing through the heating foam filter 130. For example, the collecting foam filter 150 may be formed in the form of a hollow tube, and may be combined to accommodate an insulating body 110 having the heating foam filter 130 formed therein. In this case, the collecting foam filter 150 may be fixedly disposed by blocking one end by the flange portion 111 formed on the insulating body 110.

On the other hand, the collecting foam filter 150 may be made of a metal, the metal is not limited. For example, the collecting foam filter 150 may be made of a metal selected from aluminum, silver, nickel, copper, iron, titanium, palladium, chromium, and alloys thereof. The collecting foam filter 150 may use a known metal foam filter.

Hereinafter, a smoke reduction device according to another embodiment of the present invention will be described.

5 is a view schematically showing a smoke reduction device 200 according to another embodiment of the present invention. For convenience of explanation, description will be made mainly on the parts that differ from the above-described embodiment.

Referring to FIG. 5, the smoke reduction device 200 according to another embodiment of the present invention includes an insulation body 210, a heating foam filter 230, and a smoke filtering filter 250.

The insulating body 210 forms the body of the smoke reduction device 100, and exhaust gas discharged from the internal combustion engine flows into and out of the internal combustion engine. The insulating body 210 is disposed inside the aftertreatment device connected to the engine exhaust pipe of the internal combustion engine or the size that can be connected to the engine exhaust pipe of the internal combustion engine. As such, since the insulating body 210 is the same as or similar to the above-described embodiment, redundant description will be omitted.

The heating foam filter 230 and the soot filtration filter 250 are disposed in the insulating body 210.

The heating foam filter 230 is disposed in the insulating body 210 in a direction perpendicular to the exhaust gas flow direction, and may generate heat by electricity. Here, the exhaust gas flow direction means a transverse direction. Therefore, the heating foam filter 230 may be disposed in the longitudinal direction. Here, the transverse direction and the longitudinal direction should be understood as a concept including a predetermined direction error.

Since the heating foam filter 230 is the same as or similar to the above-described embodiment, redundant description of the heating foam filter 230 will be omitted.

The heating foam filter 230 may be manufactured in a sheet form, and in this case, a plurality of sheet layers may be formed and disposed inside the insulating body 210 (see enlarged view of FIG. 5). In addition, when the sheet-shaped ceramic oxidation catalyst (not shown) is disposed inside the insulating body 210, the heating foam filter 230 may be disposed in front of the ceramic oxidation catalyst.

On the other hand, the heating foam filter 230 may be provided with at least one contact portion 231. Since the contact portion 231 is the same as or similar to the above-described embodiment, redundant description will be omitted.

The soot filtration filter 250 is disposed behind the heating foam filter 230 and serves to capture particulate matter included in the exhaust gas passing through the heating foam filter 230. The soot filtration filter 250 is formed in the same or similar to the collecting foam filter 150 of the above-described embodiment may be disposed inside the insulating body 210, or a known metal foam filter or ceramic filter may be used. have.

As described above, in the embodiments of the present invention, by arranging a heating foam filter that generates heat by electricity in the smoke reduction device, the catalyst may be maintained above the activation temperature regardless of the exhaust gas temperature. Therefore, it is possible to effectively reduce the harmful substances in the exhaust gas regardless of the operating conditions of the internal combustion engine.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention as set forth in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.

100: soot reduction device 110: insulated body
111: flange 113: groove
130: foam filter for heating 131: contact portion
150: collecting foam filter
200: Soot reduction device 210: Insulation body
230: foam filter for heating 231: contact portion
250: soot filtration filter

Claims (12)

In the smoke reduction device for reducing the exhaust gas of the internal combustion engine,
An insulated body through which exhaust gas discharged from an internal combustion engine flows in and out, wherein the exhaust gas passes through the interior and has a plurality of discharge holes discharged to the outside;
The metal is formed on the outer surface of the insulating body, the catalyst is coated on the surface to generate the catalyst by electricity to convert the harmful substances of the exhaust gas passing through the discharge hole into a harmless substance by the catalytic action Foam filter for heating; And
And a collecting foam filter for accommodating the particulate matter contained in the exhaust gas passing through the heating foam filter by accommodating the heating foam filter therein. The method according to claim 1,
The insulation body, smoke reduction device, characterized in that it comprises a flange portion formed on at least one end. The method according to claim 1,
The heating foam filter is a smoke reduction device, characterized in that made of a metal selected from aluminum, silver, nickel, copper, iron, titanium, palladium, chromium and alloys thereof. The method according to claim 3,
The catalyst is a smoke reduction device, characterized in that selected from platinum, rhodium, palladium and combinations thereof. The method according to any one of claims 1 to 4,
The insulating body is formed in the form of a hollow tube,
And the heating foam filter is attached to spirally wrap the circumference of the insulating body. The method according to any one of claims 1 to 4,
A plurality of grooves are formed in the insulating body,
Soot reduction device, characterized in that the heating foam filter is fitted into the groove. The method according to any one of claims 1 to 4,
The heating foam filter is a smoke reduction device, characterized in that a plurality of the spaced in the longitudinal direction of the insulating body is attached to be spaced apart at a predetermined interval. The method according to any one of claims 1 to 4,
The heating foam filter is provided with at least one contact portion, and the smoke reduction device, characterized in that the current is supplied through the contact portion. In the smoke reduction device for reducing the exhaust gas of the internal combustion engine,
An insulated body through which exhaust gas discharged from an internal combustion engine flows in and out, wherein the exhaust gas passes through the interior and has a plurality of discharge holes discharged to the outside;
It is made of a metal material disposed in the direction perpendicular to the flow direction of the exhaust gas inside the insulating body, the surface is coated with a catalyst to generate the harmful substances of the exhaust gas passing through the discharge hole by generating the catalyst by electricity A heating foam filter for converting to a harmless substance by catalysis; And
And a soot filtration filter which is disposed behind the heating foam filter and traps particulate matter contained in the exhaust gas passing through the heating foam filter. The method according to claim 9,
The heating foam filter is a smoke reduction device, characterized in that made of a metal selected from aluminum, silver, nickel, copper, iron, titanium, palladium, chromium and alloys thereof. The method of claim 10,
The catalyst is a smoke reduction device, characterized in that selected from platinum, rhodium, palladium and combinations thereof. The method according to any one of claims 9 to 11,
The heating foam filter is provided with at least one contact portion, and the smoke reduction device, characterized in that the current is supplied through the contact portion.

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