KR102371619B1 - Exhaust gas aftertreatement apparatus - Google Patents

Abstract

An exhaust gas aftertreatment apparatus according to the present invention includes a plurality of aftertreatment components connected to an exhaust manifold of an engine; and a common housing enclosing the plurality of post-processing components, wherein the common housing has an inner cavity accommodating the plurality of post-processing components, wherein a volume of the inner cavity is greater than a volume of the plurality of post-processing components can be formed.

Description

Exhaust gas aftertreatment device {EXHAUST GAS AFTERTREATEMENT APPARATUS}

The present invention relates to an exhaust gas after-treatment device, and more particularly, as a plurality of aftertreatment components are housed by a common housing, insulation or heat retention for each post-treatment component is greatly improved. It relates to an improved exhaust gas after-treatment device.

The internal combustion engine generates exhaust gas as a product of fuel combustion, and the exhaust gas includes unburned fuel, particulate matter such as chute, and harmful gas such as carbon monoxide or nitrogen oxide. In order to meet emission regulations of the exhaust gas, the exhaust gas needs to be purified before it is released into the atmosphere.

An internal combustion engine includes an exhaust gas aftertreatment system for removing or reducing harmful gases, particulate matter, and the like in exhaust gas. The exhaust gas aftertreatment system includes an oxidation catalyst such as Diesel Oxidation Catalyst (DOC), a soot filter such as a Diesel Particulate Filter (DPF) or a Catalyed Diesel Particulate Filter (CDPF), and one or more aftertreatment components such as Selective Catalytic Reduction (SCR). aftertreatment component).

The oxidation catalyst oxidizes soluble organic matter (SOF) among carbon monoxide (CO), hydrocarbon (HC), and particulate matter (PM) in exhaust gas to purify it into carbon dioxide (CO ₂ ) and water (H ₂ 0), which are harmless to the human body. is composed A mixture of noble metals (Pt, Pd, Rh) is applied to the surface of the DOC in a uniform thickness, and the carrier is mainly made of cordierite, and the cross section of the carrier has more than 60 micropores per cm 2 .

The soot filter may be configured to physically collect and burn PM (particulate matter) in the exhaust gas to remove it, reduce the collected PM by oxidation reaction with nitrogen dioxide (NO ₂ ), and engine wear present in the exhaust gas in addition to PM. It plays a role in filtering solid components such as scraps and metal components in engine oil. The soot filter is configured to perform a regeneration process that burns the captured PM so that the filter can capture the PM again. The regeneration method of the soot filter includes an electric heater method, a burner regeneration method, a fuel additive method, a catalyst coating method, a high voltage plasma method, and the like.

SCR is an SCR catalyst that converts harmless N ₂ and H ₂ O by using urea as a reducing agent to remove NOx in exhaust gas, a reducing agent tank accommodating the reducing agent, and a reducing agent from the reducing agent tank upstream of the SCR catalyst It has a dosing unit that is injected to the side.

Meanwhile, in order to maintain the ambient temperature of each post-treatment component, such as an oxidation catalyst, a soot filter, and an SCR, at a constant temperature, an insulating material is individually mounted on the outer surface of each post-treatment component. For example, the ambient temperature of the oxidation catalyst, soot filter, etc. needs to be maintained at 450 ~ 550 ℃, SCR needs to maintain the ambient temperature of 180 ~ 250 ℃.

However, when the external air temperature of the vehicle is lowered to about -20°C, such as in winter, the catalyst activation temperature of each post-treatment component may be lowered as the ambient temperature of each post-treatment component is lowered. Purification efficiency may be reduced. Accordingly, conventionally, a structure for increasing the ambient temperature of each post-treatment component by applying a heating unit such as an electric heater or a burner or by additionally burning fuel is applied. As a result, the fuel efficiency of the vehicle deteriorated.

In this way, the exhaust gas after-treatment system is greatly affected by the vehicle's external air temperature, so the purification efficiency of each post-treatment component may be lowered, and it also responds appropriately to EURO 6D regulations that apply PEMS (Portable Emissions Measurement Systems). You may not be able to

In addition, it is configured to raise the temperature of a heat exchanger of an external system using a heat source of the exhaust gas after-treatment system, such as an exhaust boiler of a waste heat recovery system (WHR system). However, each post-treatment component has a disadvantage in that it is not possible to effectively increase the temperature of the heat exchangers of other systems due to the influence of the external temperature of the vehicle.

As such, when the ambient temperature of each post-treatment component of the exhaust gas after-treatment system cannot be stably maintained, not only the purification efficiency of each post-treatment component but also the efficiency of the heat exchanger of the external system related to the exhaust gas after-treatment system is reduced. could be

The present invention has been devised in consideration of the above points, and as a plurality of aftertreatment components are housed by a common housing, insulation or heat retention for each posttreatment component is provided. An object of the present invention is to provide an exhaust gas aftertreatment device that can be significantly improved.

Exhaust gas post-treatment device according to the present invention for achieving the above object,

a plurality of aftertreatment components coupled to an exhaust manifold of the engine; and

Including; a common housing surrounding the plurality of post-processing components;

the common housing has an interior cavity to receive the plurality of post-processing components;

A volume of the interior cavity may be formed to be greater than a volume of the plurality of post-processing components.

The common housing may include an insulating material.

The common housing may have a heat insulating layer attached to its outer surface.

The common housing may have one or more partition walls disposed in the inner cavity.

The inner cavity may be partitioned by the one or more partition walls.

The one or more partition walls may have an opening through which an exhaust pipe connecting the plurality of aftertreatment components passes.

The at least one partition wall may have a through hole formed in a portion facing the bottom of the common housing.

The common housing may have a discharge pipe connected to an upper end thereof and a discharge valve installed in an internal flow path of the discharge pipe to be openable and openable.

The discharge valve opens the internal flow path of the discharge pipe when the internal pressure of the common housing rises above a set pressure, and closes the internal flow path of the discharge pipe when the internal pressure of the common housing is below the set pressure. Can be configured .

A drain pipe may be connected to the bottom of the common housing, and a water separator for separating condensed water may be mounted to the drain pipe.

The common housing may have an introduction pipe for introducing external air into the inner cavity and an introduction pump mounted on the introduction pipe.

A bottom of the common housing may be inclined with respect to a horizontal line.

A heat exchanger of the waste heat recovery system may be disposed at one inner side of the common housing.

According to the present invention, as a plurality of aftertreatment components are housed by a common housing, thermal insulation or heat retention for each posttreatment component can be significantly improved, and through this The purification efficiency of each post-treatment component can be improved by stably maintaining the ambient temperature of the plurality of post-treatment components by the high temperature of the purified exhaust gas without being affected by the ambient temperature.

1 is an exhaust gas post-treatment device according to an embodiment of the present invention;

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Referring to FIG. 1 , an exhaust gas aftertreatment apparatus according to the present invention includes a plurality of aftertreatment components 11 and 12 connected to an exhaust manifold 1a of an engine 1 , and a plurality of aftertreatment components 11 , 12) may include a common housing 15 surrounding the.

The plurality of aftertreatment components 11 , 12 may be connected in communication with each other via exhaust pipes 13 , 14 to receive exhaust gas exhausted from the exhaust manifold 1a of the engine 1 . The plurality of aftertreatment components 11 , 12 may be configured to treat unburned fuel in the exhaust gas, particulate matter such as chute, noxious gases such as carbon monoxide or nitrogen oxides, and the like.

According to one embodiment, the plurality of after-treatment components 11 , 12 includes a first after-treatment component 11 , a first connected to an exhaust manifold 1a of the engine 1 through a first exhaust pipe 13 . It may consist of a second aftertreatment component 12 communicatively connected via a second exhaust pipe 14 to the aftertreatment component 11 .

The first after-treatment component 11 may be disposed on the downstream side of the exhaust manifold 1a of the engine 1 , whereby the first after-treatment component 11 is exhausted through the first exhaust pipe 13 . gas can be accommodated.

According to an embodiment, the first post-treatment component 11 includes an oxidation catalyst 11a such as Diesel Oxidation Catalyst (DOC), etc., a soot filter 11b such as a Diesel Particulate Filter (DPF), etc., an oxidation catalyst 11a and soot. The filter 11b may be formed of any one of an oxidation catalyst and a soot filter assembly in which the filter 11b is integrally combined. 1 illustrates a structure in which the first post-treatment component 11 is configured by an oxidation catalyst and a soot filter assembly in which an oxidation catalyst 11a and a soot filter 11b are integrally combined.

The oxidation catalyst 11a oxidizes the soluble organic material (SOF) among carbon monoxide (CO), hydrocarbon (HC), and particulate matter (PM) in the exhaust gas to carbon dioxide (CO ₂ ) and water (H ₂ 0) that are harmless to the human body. configured to purify. A mixture of noble metals (Pt, Pd, Rh) is applied to the surface of the DOC in a uniform thickness, the carrier is mainly made of cordierite, and the cross section of the carrier may have more than 60 micropores per cm 2 .

The soot filter 11b may be configured to physically collect PM (particulate matter) in the exhaust gas and burn it to remove it, and reduce the collected PM through an oxidation reaction with nitrogen dioxide (NO ₂ ), and is present in the exhaust gas in addition to PM It plays a role in filtering out solid components such as engine wear fragments and metal components in engine oil. The soot filter 11b is configured to perform a regeneration process by burning the captured PM so that the filter can collect the PM again.

According to one embodiment, the first post-processing component 11 may have a first heating device 18 disposed around it, the first heating device 18 being a heating coil which is heated as electrical energy is supplied. may be configured. The catalytic activation of the first post-treatment component 11 can be carried out quickly and efficiently by heating the first heating mechanism 18 .

According to another embodiment, the catalyst of the first post-treatment component 11 may be composed of a metal catalyst, whereby the metal catalyst is heated as electric energy is supplied to the metal catalyst, thereby catalyzing the catalyst of the first post-treatment component 11 . Activation can be done quickly and efficiently.

The second post-treatment component 12 may be disposed on the downstream side of the first post-treatment component 11 , whereby the second post-treatment component 12 is connected to the second exhaust pipe ( 14) can accommodate the exhaust gas passed through.

The second after-treatment component 12 may have an outlet 12c, and exhaust gas purified by the catalyst of the second after-treatment component 12 may be discharged through the outlet 12c.

The second post-processing component 12 may be configured with Selective Catalytic Reduction (SCR). SCR is an SCR catalyst 12a that converts harmless N ₂ and H ₂ O into harmless N 2 and H 2 O by using urea as a reducing agent for the removal of NOx in exhaust gas, a reducing agent tank (not shown) for accommodating a reducing agent, and a reducing agent tank It may have a dosing unit (12b, dosing unit) for injecting the reducing agent from the SCR catalyst (12a) to the upstream side.

According to one embodiment, the second post-processing component 12 may have a second heating device 19 disposed around it, the second heating device 19 being a heating coil that is heated as electrical energy is supplied. may be configured. Catalytic activation of the second post-treatment component 12 can be performed quickly and efficiently by heating the second heating mechanism 19 .

According to another embodiment, the catalyst of the second post-treatment component 12 may be composed of a metal catalyst, whereby the metal catalyst is heated as electric energy is supplied to the metal catalyst, thereby catalyzing the catalyst of the second post-treatment component 12 . Activation can be done quickly and efficiently.

The common housing 15 may have interior cavities 15a and 15b in which the plurality of components 11 and 12 are accommodated.

As such, as the inner cavities 15a and 15b of the common housing 15 accommodate the plurality of components 11 and 12, the common housing 15 may be configured to surround the plurality of components 11 and 12. .

The common housing 15 may be made of a heat-resistant material that can sufficiently withstand the high temperature of exhaust gas, such as heat-resistant metal, heat-resistant synthetic resin, or the like.

The common housing 15 increases the volume of the internal cavities 15a and 15b so that the exhaust gas discharged after passing through the plurality of components 11 and 12 fills the space around the plurality of components 11 and 12. It can be formed larger than the volume of (11, 12). Accordingly, the inner cavities 15a and 15b of the common housing 15 may have a free space in which the purified exhaust gas discharged after passing through the plurality of components 11 and 12 is filled.

In addition, the outlet 12c of the second component 12 may be disposed to be spaced apart from the inner surface of the common housing 15 by a predetermined interval t.

In this way, as the purified exhaust gas discharged from the exhaust port 12c of the second component 12 is filled in the inner cavities 15a and 15b of the common housing 15, the plurality of components 11 and 12 of the vehicle By raising the temperature to 100° C. or higher than the external ambient temperature, the plurality of components 11 and 12 can be effectively kept warm or insulated, thereby improving the purification efficiency of each post-treatment component.

The common housing 15 may be configured to include a heat insulating material, thereby reducing or blocking the heat source of the purified exhaust gas from being radiated to the outside of the common housing 15, so that a plurality of post-treatment components 11 and 12 It is possible to more stably secure thermal insulation or heat retention for

According to an embodiment, the common housing 15 may have a heat insulating layer 15c attached to its outer surface. The heat insulating layer 15c may be formed by coating an insulating material on the outer surface of the common housing 15 or by tapping a band of the insulating material.

According to another embodiment, the common housing 15 itself may be made of a pure heat insulating material or a material mixed with a heat insulating material.

On the other hand, the common housing 15 may be configured to separately maintain thermal insulation or heat insulation for each component 11 and 12 by partitioning the plurality of components 11 and 12 by one or more partition walls 16 .

For example, as shown in FIG. 1, a partition wall 16 may be disposed between the first component 11 and the second component 12, and the internal cavity of the common housing 15 by the partition wall 16 ( 15a and 15b may be divided into a first internal cavity 15a and a second internal cavity ratio 15c. The first component 11 may be disposed in the first internal cavity 15a, and the second component 12 may be disposed in the second internal cavity 15b.

The partition wall 16 may have an opening 16a through which the second exhaust pipe 14 connecting the first component 11 and the second component 12 passes, and the inner diameter of the opening 16a is the second exhaust pipe. By being formed to be larger than the outer diameter of the pipe 14 , a gap may be formed between the opening 16a and the second exhaust pipe 14 . Accordingly, the exhaust gas discharged from the outlet 12c of the second component 12 fills the space around the first component 11 through the gap between the opening 16a and the second exhaust pipe 14, so that the first component ( 11) heat insulation and heat insulation can be made independently with respect to the second component (12).

The partition wall 16 may have a through-hole 16b , and the through-hole 16b may be disposed to face the bottom of the common housing 15 . Accordingly, the condensed water generated in the first internal cavity 15a may move to the second internal cavity 15b through the through hole 16b.

The common housing 15 may include a discharge pipe 21 attached to an upper end thereof, and the discharge pipe 21 may be configured to communicate with the second inner cavity 15b.

The exhaust gas filled in the inner cavities 15a and 15b may be discharged to the outside of the common housing 15 through the discharge pipe 21 .

In addition, the discharge pipe 21 may have a discharge valve 22 for opening and closing the internal flow path, and the discharge valve 22 may be configured as a butterfly valve.

The discharge valve 22 opens the internal flow path of the discharge pipe 21 when the internal pressure of the common housing 15 rises above the set pressure, and when the internal pressure of the common housing 15 is below the set pressure, the discharge pipe 21 It may be configured to close the internal flow path of the. Accordingly, the internal cavity ratios 15a and 15b of the common housing 15 can maintain the set pressure.

A drain pipe 23 is connected to the bottom of the common housing 15 , and a water saperator 24 for separating condensed water may be mounted to the drain pipe 23 . The exhaust gas filled in the inner cavities 15a and 15b of the common housing 15 may generate condensed water due to the temperature difference between the inside and outside of the common housing 15, and the condensed water is separated by the water separator 24 after It may be discharged through the drain pipe 23 . 1 to 3 show a configuration in which the drain pipe 23 is connected to communicate with the second internal cavity 15b.

In addition, the common housing 15 may have an introduction pipe 25 for introducing external air into the inner cavities 15a and 15b. An introduction pump 26 for pumping external air into the inner cavities 15a and 15b of the common housing 15 may be mounted on the introduction pipe 25 . 1 to 3 show a configuration in which the introduction tube 25 is connected to communicate with the second inner cavity 15b.

In addition, as shown in FIG. 2 , the common housing 15 may be disposed to be inclined with respect to the horizontal line, and through this, the condensed water generated in the inner cavities 15a and 15b of the common housing 15 is discharged more easily. can be Alternatively, only the bottom of the common housing 15 may be inclined to facilitate discharge of the condensed water.

As shown in FIG. 3 , a heat exchanger 32 of another system using a heat source of exhaust gas may be disposed on one side of the common housing 15 .

According to an embodiment, the system using the heat source of the exhaust gas may be a waste heat recovery system 30 that recovers heat of the exhaust gas. The waste heat recovery system 30 includes a circulation path 31 through which a working fluid circulates, and the circulation path 31 heats the working fluid by waste heat (heat of exhaust gas and/or heat of EGR gas) of an internal combustion engine. and a boiler 32 for evaporating, an expansion device 33 for generating rotational energy by expanding the working fluid supplied from the boiler 32, and a condenser 34 for condensing the working fluid discharged from the expansion device 33 ) and may include a circulation pump 35 installed on the circulation path 31 to circulate the working fluid.

Accordingly, since the boiler 32 of the waste heat recovery system 30 is disposed on one side of the common housing 15 , the heat of the exhaust gas filled in the second internal cavity 15b of the common housing 15 can be effectively used.

In particular, the boiler 32 of the waste heat recovery system 30 is opposite to the outlet 12c of the second component 12 so as to directly contact the exhaust gas discharged from the outlet 12c of the second component 12 . They may be spaced apart from each other at regular intervals.

Through this, the boiler 32 of the waste heat recovery system 30 stably utilizes the heat of the exhaust gas, so that the recovery efficiency of the waste heat recovery system 30 can be constantly maintained and further improved.

According to an embodiment, as shown in FIGS. 1 to 3 , the plurality of components 11 and 12 may be connected in a line by the second exhaust pipe 14 , and the common housing 15 is arranged in a line. It can be configured to accommodate a plurality of components (11, 12).

According to another embodiment, the plurality of components 11 and 12 may not be arranged in a line but may be arranged parallel to each other, and the common housing 15 accommodates the plurality of components 11 and 12 arranged in parallel to each other. can be configured to

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains.

Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1: engine 11: first post-processing component
12: second after-treatment component 13: first exhaust pipe
14: second exhaust pipe 15: common housing
16: bulkhead 18: first heating mechanism
19: second heating mechanism 21: discharge pipe
22: discharge valve 23: drain pipe
24: water separator 25: inlet pipe
26: introduction pump 30: waste heat recovery system
31: circulation path 32: boiler
33: expansion device 34: condenser
35: circulation pump

Claims (13)

a plurality of aftertreatment components coupled to an exhaust manifold of the engine; and
Including; a common housing surrounding the plurality of post-processing components;
the common housing has an interior cavity to receive the plurality of post-processing components;
a volume of the interior cavity is formed to be greater than a volume of the plurality of post-processing components;
The plurality of after-treatment components include a first after-treatment component connected to an exhaust manifold of the engine through a first exhaust pipe, and a second after-treatment component communicatively connected to the first after-treatment component through a second exhaust pipe. includes,
An exhaust gas post-treatment device in which an outlet of the second post-treatment component is spaced apart from an inner surface of the common housing by a predetermined interval. The method according to claim 1,
The common housing is an exhaust gas post-treatment device including a heat insulating material. The method according to claim 1,
The common housing is an exhaust gas post-treatment device having a heat insulating layer attached to its outer surface. The method according to claim 1,
The common housing is an exhaust gas aftertreatment device having one or more partition walls disposed in the inner cavity. 5. The method according to claim 4,
An exhaust gas aftertreatment device in which the inner cavity is partitioned by the one or more partition walls. 6. The method of claim 5,
The at least one partition wall has an opening through which an exhaust pipe connecting the plurality of aftertreatment components passes. 6. The method of claim 5,
The at least one partition wall is an exhaust gas post-treatment device having a through hole formed in a portion facing the bottom of the common housing. The method according to claim 1,
The common housing is an exhaust gas post-treatment device having a discharge pipe connected to an upper end thereof and a discharge valve installed openly and openably in an internal flow path of the discharge pipe. 9. The method of claim 8,
The discharge valve opens the internal flow path of the discharge pipe when the internal pressure of the common housing rises above a set pressure, and closes the internal flow path of the discharge pipe when the internal pressure of the common housing is below the set pressure Exhaust gas configured to post-processing device. The method according to claim 1,
A drain pipe is connected to the bottom of the common housing, and a water separator for separating condensed water is mounted on the drain pipe. The method according to claim 1,
The common housing is an exhaust gas post-treatment device having an inlet pipe for introducing external air into the inner cavity and an inlet pump mounted on the inlet pipe. The method according to claim 1,
An exhaust gas post-treatment device in which the bottom of the common housing is inclined with respect to a horizontal line. The method according to claim 1,
An exhaust gas post-treatment device in which a heat exchanger of a waste heat recovery system is disposed on one side of the inner side of the common housing.

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