DE102014101634B4 - Aftertreatment device using liquid - Google Patents

Abstract

Aftertreatment device (1) for use in an internal combustion engine (E), comprising: gas-liquid contact means (2) mounted on the exhaust pipe (EX) of an internal combustion engine (E) in which an adsorbing liquid comes in contact with certain gas constituents; adsorbing liquid is capable of adsorbing certain gas components contained in the exhaust gas discharged from the internal combustion engine (E); andan adsorbing liquid supply device (3) which supplies the adsorbing liquid to the gas-liquid contacting means (2), the gas-liquid contact means (2) comprising a porous base body, a cylindrical casing (H) and an exhaust gas introducing means (4), the porous one Base body in the cylindrical housing (H) is housed, gas-liquid contact passages (22) are formed in the porous body, the adsorbent liquid supply device (3) is connected to an end portion of the cylindrical housing (H), to an end surface of the porous body the exhaust gas introducing means (4) supplies the exhaust gas to an end part of the porous body in the cylindrical housing (H), and the exhaust gas introducing means (4) comprises an exhaust gas introduction area (41) and an opening area (43, 46), the exhaust gas introduction area (41) comprises a chamber that exist between an end surface of the por and the opening portion (43, 46) is formed in a partition plate (42, 44), so that the exhaust gas and the adsorbent liquid form the opening portion (43, 46) of the adsorptive liquid supply passage (32) Passing through the opening portion (43), wherein the exhaust gas introducing means (4) has a double cylinder structure comprising an inner cylinder (44) and an outer cylinder (45), and the exhaust gas introducing portion (41) is formed in the inner cylinder (44), and an annular chamber (47) communicating with the exhaust pipe (EX) formed between the inner cylinder (44) and the outer cylinder (45), the opening portion (46) is formed on an inner cylinder wall serving as the partition plate (42), and the exhaust gas is introduced from an outer peripheral side of the inner cylinder (44).

Description

BACKGROUND OF THE INVENTION

Field of the invention

The present invention relates to a wet type after-treatment apparatus which uses an adsorbing liquid such as an ionic liquid capable of exhaust gas discharged from an internal combustion engine by adsorbing certain gas components such as nitrogen oxides NOx contained in the exhaust gas. and separating the determined gas constituents from the exhaust gas when the adsorbing liquid comes into contact with the exhaust gas.

Description of the Prior Art

Conventional aftertreatment devices use a catalyst capable of purifying exhaust gas discharged from an internal combustion engine by eliminating certain gas components such as nitrogen oxides contained in the exhaust gas. For example, a conventional aftertreatment device uses a selective catalytic reduction in which aqueous urea is added as a reductant into a stream of offgas. The conventional method requires that the temperature of a catalyst be increased up to its operating temperature (for example, a temperature of not lower than about 200 ° C. The catalyst can exhibit NOx purification performance at this operating temperature.) Further, for the conventional process In the conventional method, since selective catalytic reduction is performed using the heat energy of the exhaust gas, the temperature of the exhaust gas decreases when a waste heat recovery device is mounted on the exhaust pipe.

There is a proposed technique relating to a small size aftertreatment device mounted on an exhaust pipe of an internal combustion engine. The after-treatment apparatus is provided with a gas-liquid contact agent using an adsorbing liquid capable of even adsorbing NOx components contained in exhaust gas when the temperature of the exhaust gas is low. The adsorbing liquid is supplied from a storage means of the adsorbing liquid into the gas-liquid contact means, and the supplied adsorbing liquid removes NOx ingredients as certain gas components from the exhaust gas. As the adsorbing liquid capable of adsorbing NOx constituents, there are water, alkaline aqueous solutions, ionic liquids, etc. When the exhaust gas in the gas-liquid contact agent comes into contact with the adsorbing liquid, the adsorbing liquid adsorbs NOx Constituents contained in the exhaust gas, and the purified exhaust gas is discharged from the exhaust pipe of the internal combustion engine to the outside. The adsorbing liquid capable of adsorbing NOx components is regularly recovered from the liquid storage means and regenerated. The regenerated adsorbent liquid is stored in the liquid storage means and returned to the gas-liquid contact in the aftertreatment device.

For example, there is a conventional technique, the Japanese published patent JP 2002-306958 A patent disclosing a specific structure of such a gas-liquid contact agent having a gas-liquid contact plate. The gas-liquid contact plate has a plurality of rows. Both surfaces of each row have a waveform to form a recessed and projecting portion. In a structure of the gas-liquid contact plate, a plurality of opening parts are formed in each of the rows. A front surface and a rear surface of adjacent columns are opened by the opening parts. That is, the formation of the opening portions makes it possible to easily disperse the adsorbing liquid. The gas-liquid contact agent disclosed in Japanese Published Patent JP 2002-306958 A is shown, cleans carbon dioxide contained in the exhaust gas discharged from industrial plants. In the gas-liquid contact means, a plurality of gas-liquid contact plates in an adsorption tower are arranged approximately parallel to each other. An adsorbing liquid is fed from an upper side and combustion exhaust gas is supplied from a lower side of the adsorption tower. This structure allows the combustion exhaust gas to freely flow through the adsorbing liquid to come into contact with the adsorbing liquid.

The gas-liquid contacting device disclosed in Japanese Published Patent JP 2002-306958 A can be applied to a large-scale adsorption tower used for a stationary-type combustor. However, this gas-liquid contact device causes the following problem when applied to internal combustion engines used for motor vehicles.

In the structure of the gas-liquid contacting device disclosed in the published panic patent JP 2002-306958 A disclosed exhaust gas and adsorbent liquid in the tower into each other opposite directions. When the size of the gas-liquid contact device is reduced to fit a motor vehicle, the flow rate of the exhaust gas in the device increases, and as a result, it becomes difficult for the adsorbing liquid to flow down the tower. This causes the adsorbing liquid to be saturated with NOx, and as a result, an adsorption rate thereof decreases. This makes it difficult to obtain a required NOx removal performance. In addition, it takes a lot of time and it is difficult to form the gas-liquid contact plate because the gas-liquid contact plate has a complicated structure in which a plurality of recessed parts and protruding parts are formed on both surfaces thereof as described above.

In addition, the structure of the gas-liquid contacting device disclosed in the Japanese Published Patent JP 2002-306958 A is disclosed, the pressure loss of the gas-liquid contact device, since the gas-liquid contact plate has a complicated structure.

Other notable documents are the following: DE 10 2012 201 336 A1 discloses an exhaust gas purification device for an internal combustion engine for purifying nitrogen oxides in an exhaust gas discharged from an engine, US 2007 0 169 467 A1 discloses an SCR silencer comprising: an SCR catalyst for selectively reducing and purifying nitrogen oxide (NOx) contained in the exhaust gas.

SUMMARY

It is therefore desirable to provide an after-treatment apparatus using an adsorbing liquid which has a high adsorption rate and a low pressure loss. The adsorbent liquid is capable of adsorbing certain gas constituents contained in the exhaust gas discharged from an internal combustion engine with high efficiency by bringing the adsorbing liquid into contact with the exhaust gas and removing the specific gas constituents from the exhaust gas to purify the exhaust gas. Further, the processing apparatus has a miniaturized size to fit motor vehicles and is manufactured at a low manufacturing cost.

An exemplary embodiment provides an aftertreatment device for an internal combustion engine that includes a gas-liquid contactor and an adsorptive fluid delivery device. The gas-liquid contact means is mounted on an exhaust pipe of an internal combustion engine. In the gas-liquid contactor, an adsorbing liquid capable of adsorbing a certain gas component contained in the exhaust gas discharged from the internal combustion engine comes in contact with the specific gas component. The adsorbing liquid supply means supplies the adsorbing liquid to the gas-liquid contact agent. In the aftertreatment device, the gas-liquid contact means comprises a porous body, a cylindrical housing, and an exhaust gas introducing means. The porous body is housed in the cylindrical housing. Gas-liquid contact passages are formed in the porous body. The adsorption liquid supply device is connected to an end portion of the cylindrical housing so as to face an end surface of the porous base body. The exhaust gas introducing means supplies the exhaust gas to an end surface of the porous body in the cylindrical housing. The exhaust gas introduction means comprises an exhaust gas introduction device and an opening region. The exhaust gas introduction device has a chamber formed between an end surface of the porous base body and a supply region of the adsorbing liquid of the adsorptive liquid supply device. The opening portion is formed in a partition plate so that the exhaust gas and the adsorbing liquid pass through the opening portion.

In the present invention, the exhaust gas introducing means has a double cylinder structure comprising an inner cylinder and an outer cylinder. The exhaust gas introduction device is formed in the inner cylinder. An annular chamber communicating with the exhaust passage is formed between the inner cylinder and the outer cylinder. The opening area ( 46 ) is formed on an inner cylinder wall serving as the partition plate. The exhaust gas is introduced from an outer peripheral side of the inner cylinder.

According to another aspect of the present disclosure, the partition plate includes a plurality of through holes and is disposed on an upstream side of a supply portion of the adsorptive liquid supply device inside the cylindrical housing of the exhaust gas introduction means. The exhaust gas is introduced into the exhaust gas introducing device from the upstream side.

According to another aspect of the present invention, the porous base body is a honeycomb structural body in which a plurality of gas-liquid contact plates are stacked to form the gas-liquid contact passages. A plurality of through holes are formed in the gas-liquid contact plates to communicate with the adjacent ones Gas-liquid contact passages through which pass through the exhaust gas and the adsorbent liquid.

According to another aspect of the present invention, the through holes in the gas-liquid contact plates arranged in the porous body are formed by cutting the gas-liquid contact plates. The number of through holes formed in an upstream region of the gas-liquid contact plates is higher than the number of through-holes formed in a downstream region of the gas-liquid contact plates.

According to another embodiment of the present invention, the through holes are formed only in an upstream portion of the gas-liquid contact plates disposed in the porous body by cutting the gas-liquid contact plates.

According to another embodiment of the present invention, the adsorbing liquid is an ionic liquid having a higher viscosity than water, and the adsorbing liquid maintains its liquid state under the operating conditions of the aftertreatment device.

In another aspect of the present invention, the particular gas constituents are nitrogen oxide components contained in the exhaust gas.

In the aftertreatment device according to the present invention, the exhaust gas and the adsorbent liquid together in the same direction pass through the gas-liquid contact passages formed in the porous body of the honeycomb structural body, and the adsorbing liquid adsorbs certain gas components contained in the exhaust gas to the To clean exhaust gas. The exhaust gas introducing device is disposed between an injector as an outlet portion of the adsorption liquid supplying device and an end surface of the porous base body. Since the exhaust gas introduction device is separated from the exhaust passage by the partition plate, it is possible to supply exhaust gas to the inside of the porous base body through the opening holes formed in the opening portion of the partition plate without turbulence of the exhaust gas and the adsorbing liquid sprayed by the injector , to cause. This makes it possible to uniformly supply the sprayed adsorbing liquid into the entire end surface of the porous body in the honeycomb body of the gas-liquid contact agent. In addition, the exhaust gas and the adsorbing liquid may be spread on the surfaces of the walls of the gas-liquid contact passages arranged in the porous base body in the honeycomb structural body. The adsorbing liquid adsorbs with high efficiency certain gas components contained in the exhaust gas. Finally, the purified exhaust gas is expelled from the aftertreatment device.

Accordingly, in this structure, the aftertreatment device according to the present invention comes into contact with the exhaust gas with ionic liquid as the adsorbing liquid that contacts the exhaust gas with high efficiency along the surfaces of the walls of the gas-liquid contact passages in the porous base body such as the honeycomb structural body NOx components, to adsorb and remove. This makes it possible to provide the after-treatment apparatus having a small size with high efficiency and to apply the after-treatment apparatus of the present invention to internal combustion engines for motor vehicles where exhaust gas flows at a high speed. Moreover, the aftertreatment device of the present invention, since it does not require a complicated structure of the surfaces of the walls of the gas-liquid contact passages, can be manufactured at a low cost.

list of figures

• 1 eine Ansicht ist, die eine Gesamtstruktur einer Nachbehandlungsvorrichtung vom Nass-Typ nach einer ersten beispielhaften Ausführungsform zur Verwendung in Verbrennungsmotoren darstellt;
• 2 eine schematische perspektivische Ansicht ist, die eine Struktur eines NOx-Adsorptionsbereichs als ein Gas-Flüssigkeitskontaktmittel in einer Nachbehandlungsvorrichtung vom Nass-Typ nach der ersten beispielhaften Ausführungsform, die in 1 dargestellt ist, darstellt;
• 3 eine Ansicht ist, die eine Gesamtstruktur eines Verbrennungsmotorsystems darstellt, das an einem Motorfahrzeug montiert ist, woran die Nachbehandlungsvorrichtung vom Nass-Typ nach der ersten beispielhaften Ausführungsform montiert ist;
• 4 eine Ansicht ist, die eine detaillierte Struktur eines Beispiels eines Abgaseinbringungsmittels in der Nachbehandlungsvorrichtung vom Nass-Typ nach der ersten beispielhaften Ausführungsform darstellt, die 1 dargestellt ist;
• 5 eine Ansicht ist, die eine detaillierte Struktur eines Beispieles des Abgaseinbringungsmittels in der Nachbehandlungsvorrichtung vom Nass-Typ nach einer zweiten beispielhaften Ausführungsform der vorliegenden Erfindung darstellt;
• 6 eine Ansicht ist, die einen Querschnitt eines großen Teils eines Beispiels des Abgaseinbringungsmittels der Nachbehandlungsvorrichtung vom Nass-Typ nach einer dritten beispielhaften Ausführungsform der vorliegenden Erfindung darstellt, der eine detaillierte Struktur umfasst;
• 7A eine Ansicht ist, die einen teilweisen Querschnitt erster Gas-Flüssigkeitskontaktplatten mit einer Wellenform darstellt, die in einem Wabenstrukturkörper des NOx-Adsorptionsbereichs in der Nachbehandlungsvorrichtung vom Nass-Typ nach der vierten beispielhaften Ausführungsform der vorliegenden Erfindung angeordnet sind;
• 7B eine Ansicht ist, die einen teilweisen Querschnitt erster Gas-Flüssigkeitskontaktplatten mit anderer Struktur darstellt, die im Wabenstrukturkörper des NOx-Adsorptionsbereichs in der Nachbehandlungsvorrichtung vom Nass-Typ nach der vierten beispielhaften Ausführungsform der vorliegenden Erfindung angeordnet sind;
• 8 eine Ansicht ist, die einen teilweisen Querschnitt der ersten Gas-Flüssigkeitskontaktplatte mit Wellenform darstellt, die im Wabenstrukturkörper des NOx-Adsorptionsbereichs in der Nachbehandlungsvorrichtung vom Nass-Typ nach der fünften beispielhaften Ausführungsform nach der vorliegenden Erfindung angeordnet ist; und
• 9 eine Ansicht ist, die einen teilweisen Querschnitt der ersten Gas-Flüssigkeitskontaktplatte mit Wellenform darstellt, die im Wabenstrukturkörper des NOx-Adsorptionsbereichs in der Nachbehandlungsvorrichtung vom Nass-Typ nach einer sechsten beispielhaften Ausführungsform nach der vorliegenden Erfindung angeordnet ist.

A preferred non-limiting embodiment of the present invention will be described by way of example with reference to the accompanying drawings, in which:

• 1 FIG. 11 is a view illustrating an overall structure of a wet type after-treatment apparatus according to a first exemplary embodiment for use in internal combustion engines; FIG.
• 2 FIG. 12 is a schematic perspective view showing a structure of a NOx adsorption area as a gas-liquid contact agent in an after-treatment apparatus of FIG Wet type according to the first exemplary embodiment, which in 1 is shown;
• 3 FIG. 11 is a view illustrating an overall structure of an engine system mounted on a motor vehicle on which the wet type after-treatment apparatus according to the first exemplary embodiment is mounted; FIG.
• 4 FIG. 11 is a view illustrating a detailed structure of an example of an exhaust gas introduction means in the wet type after-treatment apparatus according to the first exemplary embodiment, which is shown in FIG 1 is shown;
• 5 Fig. 13 is a view illustrating a detailed structure of an example of the exhaust gas introduction means in the wet type after-treatment apparatus according to a second exemplary embodiment of the present invention;
• 6 Fig. 12 is a view illustrating a cross section of a large part of an example of the exhaust gas introducing means of the wet type after-treatment apparatus according to a third exemplary embodiment of the present invention, which comprises a detailed structure;
• 7A FIG. 12 is a view showing a partial cross section of first gas-liquid contact plates having a waveform disposed in a honeycomb structural body of the NOx adsorption region in the wet type after-treatment apparatus according to the fourth exemplary embodiment of the present invention; FIG.
• 7B FIG. 12 is a view illustrating a partial cross section of first gas-liquid contact plates of a different structure disposed in the honeycomb structural body of the NOx adsorption region in the wet type after-treatment apparatus according to the fourth exemplary embodiment of the present invention; FIG.
• 8th FIG. 12 is a view showing a partial cross section of the first waveform waveguide gas-liquid contact plate disposed in the honeycomb structural body of the NOx adsorption area in the wet type after-treatment apparatus according to the fifth exemplary embodiment of the present invention; FIG. and
• 9 FIG. 12 is a view showing a partial cross section of the first waveform waveguide gas-liquid contact plate disposed in the honeycomb structural body of the NOx adsorption area in the wet type after-treatment apparatus according to a sixth exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings. In the following description of the various embodiments, like reference numerals or numerals designate like or equivalent components throughout the several diagrams.

There will now be an aftertreatment device according to a first exemplary embodiment with reference to FIG 1 to 4 described.

1 FIG. 14 is a view illustrating an overall structure of the after-treatment apparatus according to the first exemplary embodiment mounted on an engine E. As shown in FIG. 2 FIG. 12 is a schematic perspective view showing a structure of a NOx (nitrogen oxide) adsorption region. FIG 2 in the aftertreatment device described in 1 is shown. 3 FIG. 10 is a view illustrating an overall structure of an internal combustion engine system provided with an engine E mounted on a motor vehicle (not shown) to which the wet type after-treatment apparatus according to the first exemplary embodiment is mounted. Hereinafter, the after-treatment device according to the first exemplary embodiment will be described as a wet-type after-treatment device 1 described.

As in 3 As shown, the after-treatment apparatus mounted in an exhaust passage or on an exhaust pipe EX of the engine E uses liquid to remove certain gas components contained in exhaust gas flowing through the exhaust pipe EX. The internal combustion engine E is a diesel engine with a turbocharger. A diesel particulate filter (DPF) 101 and an exhaust heat recovery device 102 are mounted on the exhaust pipe EX. The wet type post-treatment device 1 According to the first exemplary embodiment, at the exhaust pipe EX on a downstream side of the DPF 101 and the exhaust heat recovery device 102 assembled. In particular, the aftertreatment device uses wet type 1 According to the first exemplary embodiment, nitrogen oxide (NOx) liquid capable of adsorbing NOx constituents as certain gas constituents contained in the exhaust gas and removing the NOx constituents from the exhaust gas.

The internal combustion engine E is provided with a turbocharger, which is a compressor 103 and an exhaust gas turbine 104 includes. Air is sucked through an inlet IN1 of a suction pipe IN into the interior of the suction pipe. The intake air is passed through the compressor 103 compressed. The high-temperature compressed air is passed through an intercooler 106 cooled, which is mounted on the intake line IN. The cooled air passes through each of the ports of an intake manifold 107 sucked into a combustion chamber of the internal combustion engine E. Be in the combustion chamber of the engine E. the sucked air and fuel are mixed and combustion of the mixture is performed. The engine E generates a force around a rotation shaft 108 of the internal combustion engine E to set in rotation.

After combustion, the exhaust gas is expelled from the combustion chamber of the engine E into an exhaust manifold. The exhaust gas turbine 104 is set in rotation by the exhaust gas. The compressor 103 that with the exhaust gas turbine 104 is connected, compressed air and the exhaust gas is discharged into the exhaust pipe EX. If the exhaust gas is the DPF 101 passing through a catalyst mounted on the exhaust pipe EX, particulate matter (PM) contained in the exhaust gas is filtered and held. At the same time, the exhaust gas is purified by an oxidation catalyst that removes hydrocarbon (HC) and carbon monoxide (CO) from the exhaust gas. The DPF 101 has a plurality of cells formed by partition walls. The surfaces of the partition walls are coated with the oxidation catalyst. After the cleaning operation, the exhaust gas passes through the exhaust heat recovery device 102. The exhaust heat recovery device 102 Under ordinary conditions, the exhaust gas cools down to a temperature range of 100 ° C to 180 ° C.

The DPF 101 is a filter made of ceramics having the porous partition walls forming the cells. That is, the DPF 101 is a well-known exhaust filter of the Wall-Flow type. The exhaust heat recovery device is a known Rankine cycle device. For example, the heat energy generated when the exhaust heat recovery device evaporates 102 the exhaust gas cools down, a coolant. Since the vaporized coolant has a high pressure and causes the gas turbine to rotate, an electric generator such as an alternator directly connected to the gas turbine generates electric power. A battery (omitted in the figures) is charged with the electric current generated by the electric generator.

The cooled exhaust gas is introduced into the wet type after-treatment device 1 brought in. When the NOx components contained in the exhaust gas come into contact with the NOx absorbing liquid, the NOx adsorbing liquid absorbs the BOx components. That is, PM, HC, CO and NOx are exhausted by the DPF 101 and the wet-type after-treatment device 1 removed previously described. The purified exhaust gas is discharged to the outside through an outlet EX1 of the exhaust pipe EX. An ozone supplying device (not shown) is on an upstream side of the wet type after-treatment device 1 and a chemical reaction between NOx contained in exhaust gas and ozone supplied from the ozone supplying device to convert NOx to nitric acid (HNO ₃ ) or a precursor such as N ₂ O ₅ of nitric acid (HNO ₃ ) is performed. As shown in the specification, NOx components include nitrogen oxides such as NO, NO _2, and compounds such as HNO ₃ and N ₂ O ₅ .

An air flow sensor 1 is disposed on a downstream side just after the inlet IN1 of the intake pipe IN in an intake system. Further, a throttle opening rate sensor S2 arranged in the intake system, the opening rate of an intake throttle 110 detected. Further, an intake air pressure sensor S3 in the intake system in a common area of the Ansaugluftkrümmers 107 arranged. An engine speed sensor S4 is near the output shaft 108 arranged the internal combustion engine E. A temperature sensor S5 is on a downstream side of the DPF 101 arranged to detect the temperature of the exhaust gas. Further, an accelerator opening rate sensor S6 (Not shown) mounted on the intake system to detect an opening rate of the accelerator pedal (not shown). Each of these sensors S1 to S6 converts its detection results into detection signals. The electrical detection signals are from each of these sensors S1 to S6 through transmission lines to an electrical control unit (ECU) 111 transmitted.

Next, a structure of the wet type after-treatment apparatus will be described 1 described according to the first exemplary embodiment.

As in 1 As shown, the aftertreatment device is of the wet type 1 arranged in the exhaust pipe EX. The wet type post-treatment device 1 indicates the NOx adsorption area 2 and a supply device of the adsorbing liquid 3 on. The NOx adsorption area 2 acts as a gas-liquid contactant. The supply area of the adsorbing liquid 3 introduces NOx adsorbing liquid into the NOx adsorption area 2 to. The NOx adsorption area 2 takes a honeycomb structural body 23 which has a porous body in a housing H having a cylindrical shape (referred to as the cylindrical housing H).

The NOx adsorption area 2 has a structure in which a plurality of gas-liquid contact plates 21 is stacked. A plurality of gas-liquid contact passageways 22 is between the gas-liquid contact plates 21 formed adjacent to each other, so that the gas-liquid contact passages along a vertical direction of the gas-liquid contact plates 21 are formed, that is, the gas-liquid contact passages 22 extend from a lower side to an upper side of the gas-liquid contact plates 21 , An injection device 31 is arranged on an upper side of the cylindrical housing H, so that the injection device 31 the honeycomb structural body 32 faces at a predetermined distance. The injector 31 acts as the feeder 3 the adsorbing liquid. An exhaust gas introduction means 4 is at an upper side of the honeycomb structural body 23 and an adsorbent liquid recovery device is disposed on an underside of the honeycomb structural body 23 arranged.

As in 2 shown, includes each of the gas-liquid contact plates 21 a first gas-liquid contact plate 21a in waveform and a second gas-liquid contact plate 21b in plate form. That is, the gas-liquid contact plates 21 have a structure in which the first gas-liquid contact plates 21a and the second gas-liquid contact plates 21b the honeycomb structural body 23 form and alternately along a horizontal direction of the honeycomb structural body 23 are arranged. Usually, each of the first gas-liquid contact plates 21a and the second gas-liquid contact plates 21b made of a metal plate such as a stainless steel having corrosion resistance. A majority of the gas-liquid contact passageways 22 is the distance of the waveform of the first gas-liquid contact plate 21a in the honeycomb structural body 23 educated. Both surfaces of the first gas-liquid contact plate 21a and the second gas-liquid contact plate 21b serve as the gas-liquid contact surface. When caused to flow down along the gas-liquid contacting surface, the adsorbing liquid comes into contact with the exhaust gas entering the gas-liquid contact passages 22 is introduced.

As in 1 That is, an inner surface of an upper end portion of the cylindrical housing H serves as an exhaust gas introduction portion 41 the exhaust gas introduction means 4 , The exhaust gas is connected from the exhaust pipe EX, which is connected to an opening portion formed on the top of the cylindrical housing H, through the exhaust gas introducing portion 41 in the NOx adsorption area 2 brought in.

The adsorbing liquid supply device 3 is the upper end surface (as a surface) of the honeycomb structural body 23 over a room as an exhaust gas introduction area 41 across from. A nozzle 32 the injector 31 in the adsorbing liquid supply device 3 the adsorbing liquid flows through a fluid supply line 33 is promoted to the honeycomb body 23 on. The adsorbing liquid and the exhaust gas flow together in the same direction (in a vertical direction in FIG 1 is shown) inside the NOx adsorbing area 2 to the bottom of the cylindrical housing H. A gas-liquid separation area 51 in the adsorbent liquid recovery means 5 separates the adsorbing liquid from the exhaust gas.

The NOx adsorbing liquid is capable of adsorbing NOx components contained in the exhaust gas. The NOx adsorbing liquid has a viscosity higher than that of water. It is possible to use any liquid as the NOx adsorbing liquid as long as the liquid does not have a viscosity greater than that of water and maintains its liquid state in the environment of use. It is preferable to use an ionic liquid capable of adsorbing NOx components such as NOx and HNO ₃ , for example, an ionic liquid comprising carboxylate. It is more preferable to combine at least one or more of an alkylcarboxylic acid ion and its derivatives, wherein an anion of carboxylate is represented by C _n H _{2n + 1} COO ^- (n is an integer of 1 to 10) to produce the adsorbing liquid having the desired adsorptivity and viscosity.

Since the ionic liquid is not vaporized at a high temperature, it is possible to prevent from the ionic liquid in the exhaust gas introduction region 41 be fine particles and prevent the fine particles of ionic liquid in the exhaust gas introduction area 41 hover. Since a viscosity of such ionic liquid is relatively large, the ionic liquid expands inside the exhaust gas introduction region 41 with an injection angle, the shape of the nozzle 32 the injector 31 equivalent.

The NOx adsorbing liquid as an ionic liquid slowly flows the surfaces of the gas-liquid contact passages 22 to the bottom of the honeycomb structural body 23 down while in contact with NOx components contained in the exhaust gas. The NOx adsorbing liquid chemically adsorbs NOx components contained in the exhaust gas, and the adsorbing state of the NOx adsorbing liquid is stably maintained. It is therefore not necessary to use the wet-type after-treatment device 1 to install any cooling device capable of cooling the NOx adsorbing liquid. Therefore, it is possible to perform a simple recovery of the NOx adsorbing liquid, that is, simply adsorbing the NOx Liquid from NOx adsorption area 2 catch. This enables the entire structure of the wet type after-treatment device 1 to miniaturize.

The trapped adsorbing liquid is passed through a fluid line 52 aligned with the lower area of the gas-liquid separation area 51 is returned to a tank of adsorbing liquid T. The exhaust gas, which is separated from the adsorbent liquid, is introduced into the exhaust pipe EX, with side portion of the gas-liquid separation region 51 connected, ejected. The adsorbing liquid tank T is connected to the liquid conveying pipe via a pump P 33 connected. A circulation path is defined by the tank of the adsorbing liquid T, the pump P, the gas-liquid separation area 51 in recovering agent for the adsorbing liquid 5 and the fluid line 52 educated.

The honeycomb structural body 23 as the NOx adsorption area 2 has a plurality of through holes 24 (or open holes). The through holes 24 are in each of the gas-liquid contact plates 21 formed so that the through holes 24 the gas-liquid contact plates 21 break through. The adjacent gas-liquid contact passages 22 passing through the gas-liquid contact plates 21 are formed over the through holes 24 in connection. That is, both surfaces of the gas-liquid contact plate 21 stand through the through holes 24 in connection. At this time, if the nozzle 32 the injector 31 the adsorbent liquid into the exhaust gas introduction region 41 the exhaust gas introduction means 4 injecting, the adsorbing liquid is sprayed in a radial direction and reaches the upper end surface of the honeycomb structural body 23 , The sprayed adsorbent liquid expands through the through-holes 24 on both surfaces of the gas-liquid contact plates 21 , As in 1 shown are the through holes 24 at least in the upstream side of the honeycomb structural body 23 educated. This makes it possible to effectively distribute the adsorbing liquid and the NOx adsorption area 2 to produce with a simple structure.

4 FIG. 12 is a cross-sectional view showing a detailed structure of an example of the exhaust gas introduction means. FIG 4 in the wet type post-treatment device 1 according to the first exemplary embodiment, the in 1 is shown. In particular, presents 4 a detailed structure of the exhaust gas introduction means 4 that is in 1 is shown. In the first exemplary embodiment, the exhaust gas from the adsorbing liquid supply device 3 supplied from the top to the bottom. That is, the adsorbing liquid and the exhaust gas are conveyed in the same direction. A subdivision plate 42 is disposed at the top of the cylindrical housing H to the exhaust passage from the exhaust gas introduction region 41 the exhaust gas introduction means 4 to separate. The subdivision plate 42 has an opening area 43 formed by a plurality of opening holes formed in both surfaces thereof. The exhaust gas is passing through the opening area 43 having the opening holes, inside the exhaust gas introduction area 41 the exhaust gas introduction means 4 promoted. The front area of the nozzle 32 the injector 31 is at the same height of the surface of the subdivision plate 42 arranged or stands from the partition plate 42 down to the injection of the adsorbent liquid into the exhaust gas introduction region 41 the exhaust gas introduction means 4 to transport. The opening area 43 has the opening holes evenly on the entire surface of the partition plate 42 are formed to smooth the exhaust gas without increasing a pressure loss in the Abgaseinbringungungsbereich 41 contribute.

When the exhaust gas is introduced from the top of the cylindrical housing H and a large amount of exhaust gas in the exhaust gas introduction region 41 is introduced, there is a possibility that a collision between the exhaust gas and the sprayed adsorbent liquid is caused and turbulence of the exhaust gas and the sprayed adsorbent liquid is generated. However, in the structure of the wet type after-treatment apparatus according to the first exemplary embodiment, since the presence of the partition plate 42 the flow of exhaust gas weakens, the exhaust evenly through the opening area 43 with the opening holes in the exhaust gas introduction area 14 brought in. This allows the exhaust gas to be uniform and uniform in the exhaust gas introduction area 41 the exhaust gas introduction means 4 without impeding the flow of exhaust gas and causing any swirling of the sprayed adsorbing liquid and the exhaust gas. The adsorbing liquid adsorbs NOx constituents contained in the exhaust gas while the mixture of the sprayed adsorbing liquid and the exhaust gas inside the gas-liquid contact passages 22 placed between the gas-liquid contact plates 21 NOx adsorbing area 2 are formed, flows down.

Second embodiment of the invention

A wet type aftertreatment device according to a second exemplary embodiment Embodiment is with reference to 5 described.

5 FIG. 12 is a view illustrating a detailed structure of an example of the exhaust gas introduction means in the wet type after-treatment apparatus according to the second exemplary embodiment. FIG.

As in 5 That is, the exhaust passage is shown as the exhaust pipe EX on the side of the adsorptive liquid supply device 3 arranged in a direction perpendicular to a conveying direction of the adsorbing liquid, so that the exhaust gas from the side of the adsorbing liquid supplying device 3 is encouraged. Thereafter, the flow direction of the exhaust gas is deflected to the conveying direction of the adsorbing liquid. That is, the flow of the exhaust gas is redirected in the same direction to promote the adsorbing liquid.

As in 5 That is, in the structure of the wet type after-treatment apparatus according to the second exemplary embodiment, the upper part of the cylindrical housing H has a double-cylinder structure formed by an inner cylinder 44 and an outer cylinder 45 is formed. The exhaust gas introduction area 41 is formed so that it extends from the cylindrical housing H inside the cylinder 44 extends. The exhaust passage as the exhaust pipe EX is with a side part of the outer cylinder 45 connected. The upper end of the inner cylinder 44 is open. That is, as in 5 shown, is the upper surface of the inner cylinder 44 from the outer cylinder 45 separated by a predetermined gap to an opening area 46 to form, which has an annular gap. The injector 31 is at the upper end surface of the outer cylinder 45 mounted so that the nozzle 32 the injector 31 the upper part of the outer cylinder 45 penetrates and from the inner surface of the upper part of the outer cylinder 45 protrudes to the nozzle 32 opposite the exhaust gas introduction area 41 to expose.

If it is in a ring shaped chamber 47 is introduced, between the outer cylinder 45 and the inner cylinder 44 is formed, the flow direction of the exhaust gas to an upper direction along the outer surface of the inner cylinder 44 distracted, as with the arrows in 5 shown. The exhaust gas reaches the opening area 46 , the annular gap formed at the top of the inner cylinder 44 having. Further, the flow direction of the exhaust gas into the interior of the inner cylinder 44 deflected so that the exhaust gas from the outer peripheral side of the exhaust gas introduction region 41 into the exhaust gas introduction area 41 is diverted. Accordingly, this structure makes it possible to introduce the exhaust gas substantially uniformly into the entire exhaust gas introduction region without causing turbulence of the adsorbent liquid passing through the injector 31 injected and sprayed. The sprayed exhaust gas flows in the same direction to the honeycomb body 23 , The second exemplary embodiment illustrates the structure in which the opening area 46 having the annular gap in the entire upper portion of the inner cylinder 44 is trained. However, the concept of the present invention is not limited by this. Instead of making the opening area 46 having the annular gap, it is possible to open the opening area 43 to form a plurality of the opening holes (see 4 ), which in the upper region of the inner cylinder 44 are formed, so that the opening holes in the opening area 43 the upper area of the inner cylinder 44 penetrate.

Third exemplary embodiment

The wet type after-treatment apparatus according to a third exemplary embodiment will be described with reference to FIG 6 described.

6 FIG. 14 is a view illustrating a cross section of a main part including a detailed structure of an example of the exhaust gas introducing means of the wet type after-treatment apparatus according to a third exemplary embodiment. As in 6 1, the wet type after-treatment apparatus according to the third exemplary embodiment has a structure including a combination of the NOx adsorption area shown in FIG 2 in 1 is shown, the adsorbing liquid supply device 3 , in the 1 is shown and the in 5 illustrated exhaust gas introduction means 4 is.

In particular, the inner cylinder serve 44 and the outer cylinder 45 as partition walls, around the exhaust gas introduction area 41 to build. That is, the inner cylinder 44 and the outer cylinder 45 have flanges 442 and 452 each formed on the lower surface in an outward radial direction of the inner cylinder 44 and the outer cylinder 45 protrude. The flange 442 of the inner cylinder 44 is on the flange 452 of the outer cylinder 45 attached to the inner cylinder 44 and the outer cylinder 45 assemble. In addition, the adsorbing liquid supply device 3 an injector housing 33H on, which has a cylindrical shape. The injector housing 33H houses the injector 31 , As in 6 shown has the outer cylinder 45 also a flange 451 on, from a peripheral part of the upper opening area, on the upper end side of the outer cylinder 45 is formed, protrudes outward. The flange 331 of the injector housing 33H is on the flange 451 of the outer cylinder 45 attached to the exhaust gas introduction area 41 to build. The outer cylinder 45 has a reduced diameter portion at the upper opening side thereof to fit and with a predetermined gap in the top of the inner cylinder 44 to fit. As in 6 shown, the inner cylinder 44 also a flange 441 at the top thereof projecting in an outward radial direction. The inner cylinder 44 is with a predetermined gap between the upper end portion of the outer cylinder and the inside of the upper end portion of the outer cylinder 45 in the outer cylinder 45 inserted and attached to it.

This structure forms the annular shaped chamber 47 between the inner cylinder 44 and the outer cylinder 45 and an annular gap as the opening portion 46 at the upper end of the inner cylinder 44 and the outer cylinder 45 , An exhaust inlet 453 is at the base area of the outer cylinder 45 educated. The exhaust inlet 453 communicates with the exhaust pipe EX, so that the exhaust gas enters the inside of the annular chamber 47 between the inner cylinder 44 and the outer cylinder 45 is introduced. As in 6 shown sprays the exhaust gas into the interior of the annular chamber 47 was introduced, to the top of the annular chamber 47 and goes through the opening area 46 , The exhaust gas is then from the outer peripheral side of the exhaust gas introduction region 41 into the exhaust gas introduction area 41 brought in.

The inner peripheral surface of the inner cylinder 44 that the exhaust gas introduction area 41 in the upper end portion has a chamfer, that is, a tapered surface, a diameter thereof gradually to the exhaust gas introduction region 41 increases. Since, by forming the tapered surface in the upper end region of the inner cylinder 44 a relatively large chamber at the outer peripheral portion of the exhaust gas introducing portion 41 This makes it possible to prevent the occurrence of turbulence of the sprayed adsorbing liquid coming from the nozzle 32 the injector 31 into the exhaust gas introduction area 41 is injected. Therefore, it is for the structure of the exhaust gas introduction area 41 possible, it the injector 31 to allow to have a relatively large injection angle, and the adsorbent liquid on the entire honeycomb structural body 23 to spray. This allows the sprayed adsorbent liquid to be uniform to the gas-liquid contact passes 22 to transport between the gas-liquid contact plates 21 in the honeycomb structural body 23 are formed.

The concept of the present invention does not limit the shape of a cross section of the honeycomb structural body 23 that made the gas-liquid contact plates 21 is constructed, which are stacked. In the third exemplary embodiment, the honeycomb structural body 23 a cross section with a relatively rectangular shape with rounded corners. This structure allows the stacked arrangement of the gas-liquid contact plates 21 coming from the first gas-liquid contact plate 21a having a waveform and the second gas-liquid contact plate 21b , which has a plate shape, is made easy to manufacture. Furthermore, this allows the volume of the NOx adsorption area 2 to increase an installation area of the wet type after-treatment device. It is possible that the honeycomb structural body 23 has an approximately round cross section, as in 2 and also that it has a cross section having another shape corresponding to the installation surface of the wet type after-treatment device.

In the third exemplary embodiment, a plurality of the through holes 24 in each of the second gas-liquid contact plates 21b formed, which have a flat shape, so that the through holes 24 the second gas-liquid contact plates 21b penetrate. That is, the through holes 24 are formed by drilling the second gas-liquid contact plates so that the through-holes 24 the gas-liquid contact passageways 22 face. For example, the through holes become 24 approximately in a semi-surface of the second gas-liquid contact plates 21b Measured from the upstream side of the NOx adsorbing region 2 educated. The exhaust gas and the adsorbent liquid flow along both surfaces of the gas-liquid contact plates 21 , This structure allows the adsorbing liquid from the upstream side of the NOx adsorbing region 2 transported on the entire surfaces of the gas-liquid contact plates 21 through the through holes 24 to expand. Further, the adsorbing liquid may appropriately contact the exhaust gas that the gas-liquid contact passages 22 passes.

Fourth exemplary embodiment

The wet type after-treatment apparatus according to a fourth exemplary embodiment will be described with reference to FIG 7A and 7B described.

7A is a view showing a partial cross-section of the first gas-liquid contact plates 21a having a waveform formed in the honeycomb structural body 23 of the NOx adsorbing area 2 of the wet type after-treatment apparatus according to the fourth exemplary embodiment. 7B is a view showing a partial cross-section of the first gas-liquid contact plates 21a which have a different structure in the honeycomb body 23 of the NOx adsorbing portion are disposed in the wet type after-treatment apparatus according to the fourth exemplary embodiment.

The wet type after-treatment apparatus according to the fourth exemplary embodiment has a structure in which a plurality of the through-holes 24 in the oblique areas of the first gas-liquid contact plate 21a is formed, which has a waveform. As in 7 shown are the through holes 24 in a surface of an inclined area near a peak of each shaft part of the first gas-liquid contact plate 21a formed in an array with regular intervals. In addition, a part of a peripheral portion of each through hole remains 24 (on a valley side of each wave part, which in 7A is shown) to a pointed part 25 to form when the first gas-liquid contact plate 21a is drilled to the through holes 24 to build. Further, the pointed parts 25 bent around the rising pointed parts 25 to build. That is, because the rising pointed parts 25 in the first gas-liquid contact plates 21a remain, it is possible to carry the distribution of the sprayed adsorbent liquid, without the first gas-liquid contact plate 21a to punch and the surface of the gas-liquid contact passages 22 to diminish.

The through holes 24 are made by simply cutting and lifting the cut parts on the slope which are on a surface of the first gas-liquid contact plate 21a is formed, which has a waveform without chips are generated. If the pointed parts 25 be formed on the slope, as on both of the surfaces of the first gas-liquid contact plate 21a is formed, which has a waveform, this structure has the disadvantage of increasing a pressure loss, since the increased number of pointed parts 25 into the gas-liquid contact passageways 22 protrudes. Accordingly, the fourth exemplary embodiment forms as in FIG 7 shown, the pointed parts 25 only on the surface of a slope of the first gas-liquid contact plate 21a that has a waveform. This structure allows the adsorbing liquid to the gas-liquid contact passageways 22 which adjoin one another, through the through holes 24 to distribute.

It is also possible to use a structure in 7B is shown, in which the through holes 24 on both surfaces of the first gas-liquid contact plate 21a are formed, so that the pointed parts 25 alternately at each shaft spacing on both surfaces of the first gas-liquid contact plate 21a are formed. That is, the through holes 24 with the pointed parts 25 are only at a slope in each of the gas-liquid contact passageways 22 trained and the pointed parts 25 are alternately on both surfaces of the first gas-liquid contact plate 21a having a waveform when a cross section of the first gas-liquid contact plate 21a that has a waveform that is in the lower side of 7B is considered.

Fifth exemplary embodiment

The wet type after-treatment apparatus according to a fifth exemplary embodiment will be described with reference to FIG 8th described.

8th is a view showing a partial cross section of the first gas-liquid contact plate 21a having a waveform formed in the honeycomb body 23 of the NOx adsorption area 2 in the wet type after-treatment apparatus according to the fifth exemplary embodiment.

In the structure of the wet type after-treatment apparatus according to the fifth exemplary embodiment disclosed in FIG 8th is shown, a formation area of the through holes differs 24 in the first gas-liquid contact plate 21a having a waveform of the formation area of the through holes 24 , in the 7 is shown.

As described above, a pressure loss in the gas-liquid contact passes increases 22 even more, the more the number of through holes 24 with the pointed parts 25 increases. Accordingly, the fifth exemplary embodiment provides a structure in which a density of the through holes 24 which are the pointed parts 25 in an upstream side of the exhaust gas is greater than in a downstream side, wherein the density of the through holes 24 a ratio of the number of through holes 24 per predetermined area. That is, a distance between the through holes 24 which are located adjacent is in the gas-liquid contact plates 21a gradually increased from the upstream side to the downstream side.

Since an ionic liquid as the adsorbing liquid has a relatively high viscosity, it is effective to have a plurality of the through holes 24 close to each other on an upstream side of the exhaust gas to the adsorbing liquid over a wide range of both surfaces of the gas-liquid contact plates 21 to distribute.

On the other hand, it is because the adsorbing liquid on both surfaces of the gas-liquid contact plates 21 in the honeycomb structural body 23 expanded, by their own weight and the flow of exhaust gas flows down downstream, possible, the number of through holes 24 in the downstream region to prevent a pressure loss of the gas-liquid contact passages 22 increases.

Sixth exemplary embodiment

The wet type after-treatment apparatus according to a sixth exemplary embodiment will be described with reference to FIG 9 described.

9 is a view showing a partial cross section of the first gas-liquid contact plate 21a having a waveform formed in the honeycomb body 23 of the NOx adsorption area 2 in the wet type after-treatment apparatus according to a sixth exemplary embodiment.

In the structure of the wet type after-treatment apparatus according to the sixth exemplary embodiment, which is shown in FIG 9 are shown, the through holes 24 which are the pointed parts 25 only in an upstream region on the surface of the first gas-liquid contact plates 21a educated. It is possible the through holes 24 to form at regular intervals only in the upstream region, or at an irregular distance, so that a distance between the through holes 24 which are disposed adjacent, in the downstream of the first gas-liquid contact plates 21a gradually increased.

To prevent a greater influence of pressure loss caused by the presence of sharp parts 25 caused, it is possible, no through holes 24 in a lower region, for example, in a lower half surface of the surface of the first gas-liquid contact plates 21a ,

It is also, as in 7A and 7B . 8th and 9 shown, possible, the through holes 24 in the first gas-liquid contact plates 21a so as to form a width of the pointed part 25 of the through hole 24 crosses at right angles to the flow direction of the exhaust gas. This structure makes it possible to easily allow the exhaust gas and the adsorbing liquid along both surfaces of the pointed parts 25 to flow, and to prevent a pressure loss from increasing.

The first exemplary embodiment to the sixth exemplary embodiment previously described the use of the honeycomb structural body 23 as a porous body disposed in the cylindrical housing H having a cylindrical shape. However, the concept of the present invention is not limited by this. For example, it is possible that the honeycomb structural body 23 has any shape as long as a plurality of the gas-liquid contact passages 22 in the honeycomb structural body 23 is formed. For example, it is possible to use a metal mold having a plurality of air holes therein with the air holes communicating with each other, or a metal porous body knitted from thin metal wires.

The wet type after-treatment apparatuses according to the first to sixth exemplary embodiments described above are small in size and can be manufactured at a low manufacturing cost and can be applied to internal combustion engines used in harsh environmental conditions, for example a high temperature and under harsh operating conditions. It is therefore preferable to mount the aftertreatment device of the present invention to internal combustion engines of motor vehicles having a narrow limited installation area for a motor. That is, it is possible to use the aftertreatment device according to the present invention on various types of internal combustion engines other than diesel engines and internal combustion engines for motor vehicles other than diesel engines. Further, it is possible to remove certain gas constituents in addition to NOx constituents contained in the exhaust gas by using various types of adsorbent liquids corresponding to these particular gas constituents.

Claims (7)

Aftertreatment device (1) for use in an internal combustion engine (E), comprising: gas-liquid contact means (2) mounted on the exhaust pipe (EX) of an internal combustion engine (E) in which an adsorbing liquid comes in contact with certain gas constituents; adsorbing liquid is capable of adsorbing certain gas components contained in the exhaust gas discharged from the internal combustion engine (E); and a supply device of the adsorbent liquid (3) which supplies the adsorbent liquid to the gas-liquid contact means (2), wherein the gas-liquid contact means (2) comprises a porous main body, a cylindrical casing (H) and an exhaust gas introducing means (4), the porous one Base body in the cylindrical housing (H) is housed, gas-liquid contact passages (22) are formed in the porous body, the adsorbent liquid supply device (3) is connected to an end portion of the cylindrical housing (H), to an end surface of the porous body the exhaust gas introducing means (4) supplies the exhaust gas to an end portion of the porous body in the cylindrical housing (H), and the exhaust gas introducing means (4) comprises an exhaust gas introduction area (41) and an opening area (43, 46), the exhaust gas introduction area (41) comprises a chamber includes, between an end surface of the por and the opening portion (43, 46) is formed in a partition plate (42, 44), so that the exhaust gas and the adsorbing liquid form the opening portion (43, 46) of the adsorbing liquid (32) of the adsorbing liquid (3) Pass through the opening portion (43), wherein the exhaust gas introducing means (4) has a double cylinder structure comprising an inner cylinder (44) and an outer cylinder (45), and the Abgaseinbringungungsbereich (41) in the inner cylinder (44) is formed, and an annular chamber (47 ), which communicates with the exhaust pipe (EX), is formed between the inner cylinder (44) and the outer cylinder (45), the opening portion (46) is formed on an inner cylinder wall serving as the partition plate (42) Exhaust gas is introduced from an outer peripheral side of the inner cylinder (44). Aftertreatment device (1) for an internal combustion engine (E) according to Claim 1 wherein the porous base body is a honeycomb structural body (23) in which a plurality of gas-liquid contact plates (21) are stacked to form the gas-liquid contact passages (22) and a plurality of through holes (24) in the gas-liquid contact plates (23). 21) is formed to communicate with the adjacent gas-liquid contact passages (22) through which the exhaust gas and the adsorbent liquid pass. Aftertreatment device (1) for an internal combustion engine (E) according to Claim 1 wherein the porous base body is a honeycomb structural body (23) in which a plurality of gas-liquid contact plates (21) are stacked to form the gas-liquid contact passages (22) and a plurality of through holes (24) in the gas-liquid contact plates (23). 21) is formed to communicate with the adjacent gas-liquid contact passages (22) through which the exhaust gas and the adsorbing liquid pass, and the gas-liquid contact plates (21) comprise a plurality of first gas-liquid contact plates (21a), having a waveform and second gas-liquid contact plates (21b) having a plate shape and the first gas-liquid contact plates (21a) and the second gas-liquid contact plates (21b) are alternately arranged in the honeycomb structural body (23) around the gas-liquid contact passages (22) and the through holes (24) in the first glass-liquid contact plates (21a) or the second gas-liquid contact plates (21b) are formed. Aftertreatment device (1) for an internal combustion engine (E) according to Claim 1 wherein the porous base body is a honeycomb structural body (23) in which a plurality of gas-liquid contact plates (21) are stacked to form the gas-liquid contact passages (22) and a plurality of through holes (24) in the gas-liquid contact plates (23). 21) is formed to communicate with the adjacent gas-liquid contact passages (22) through which the exhaust gas and the adsorbent liquid pass, and the through-holes (24) by cutting the gas-liquid contact plates (21, 21a, 21b) into the gas-liquid contact plates (21, 21a, 21b) are formed, which are arranged in the honeycomb structural body, and the number of through-holes (24), which are formed in an upstream region of the gas-liquid contact plates (21, 21a, 21b) larger is formed as the number of the through holes (24) formed in a downstream portion of the gas-liquid contact plates (21, 21a, 21b). Aftertreatment device (1) for an internal combustion engine (E) according to Claim 1 wherein the porous base body is a honeycomb structural body (23) in which a plurality of gas-liquid contact plates (21) are stacked to form the gas-liquid contact passages (22) and a plurality of through holes (24) in the gas-liquid contact plates (23). 21) is formed to communicate with the adjacent gas-liquid contact passages (22) through which the exhaust gas and the adsorbing liquid pass, and the through-holes (24) only in an upstream region of the gas-liquid contact plates (21) are arranged in the porous body, are formed by cutting the gas-liquid contact plates (21). Aftertreatment device (1) for an internal combustion engine (E) according to Claim 1 wherein the adsorbing liquid is an ionic liquid having a viscosity higher than water, and the adsorbing liquid maintains its liquid state under a use condition of the after-treatment device (1). Aftertreatment device (1) for an internal combustion engine (E) according to Claim 1 wherein the particular gas constituents are nitrogen oxide constituents contained in the exhaust gas.

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