KR20150100221A - SCR chamber with mixer - Google Patents

Abstract

The present invention relates to an SCR chamber installed in an engine exhaust line and, more specifically, to an SCR chamber integrated with a mixer, which comprises: a chamber housing forming a specific space inside; at least one catalytic end comprised of a plurality of catalysts and installed inside the chamber housing so that the exhaust gas can pass through; a mixing pipe connected to the engine exhaust line to provide an introduction path having a specific length inside the chamber housing; and an exhaust outlet discharging the exhaust gas, which passes through the catalytic end, to the outside of the chamber housing. The present invention ensures to make better use of a space and to have simplicities in assembly and disassembly of the SCR chamber by the mixing pipe which mixes urea solution and exhaust gas being built inside the chamber housing and also by shortening the length of the pipe.

Description

SCR chamber with mixer

The present invention relates to an SCR chamber installed in an engine exhaust line. More specifically, a mixing pipe for mixing a urea water and an exhaust gas is integrally installed in an ESR chamber, The present invention relates to a mixer-integrated ESR chamber capable of improving the space utilization by securing a sufficient length as well as reducing an external pipe length.

Generally, ships are equipped with a main engine that drives a propeller to propel a ship, and a number of power generation engines that supply power to various equipment and equipment mounted on the ship.

The exhaust gas discharged after combustion in such a marine engine contains harmful gaseous substances such as a large number of floating fine particles, NOx which is a nitrogen oxide, and SOx which is sulfur oxide.

In order to reduce the emission of such pollutants, emission regulations are regulated by environmental regulations around the world.

In the case of engines, selective catalytic reduction (SCR), which removes nitrogen oxides, to reduce sulfur oxides Scrubber (removing the SOx), removing particulate matter Diesel Particulate Filter (DPF), etc. are installed to cope with environmental regulations.

Among these, nitrogen oxides are reduced Selective Catalytic Reduction (SCR) (NOx) in the exhaust gas is reduced to nitrogen and water harmless to the human body by using extrusion or metallic coating catalyst. Ammonia (NH3) or urea (Urea) is used as a reducing agent.

Hereinafter, a conventional SIS chamber will be briefly described with reference to FIG.

1 is a schematic view of a conventional engine exhaust line equipped with a conventional SIS chamber.

As shown in the figure, a mixer line 210 and an SCR chamber 250 are continuously installed in the exhaust line 150 of the engine 100.

The mixer line 210 is a hollow tubular body installed between the exhaust line 150 and the ESC chamber 250 so that the number of urea (Urea) introduced into the exhaust line 150 is uniformly mixed with the exhaust gas. .

Therefore, the exhaust gas and the urea water are mixed while passing through the mixer line 210, and the urea water is converted into ammonia (NH3) and introduced into the SO2 chamber 250. [

 The ammonia introduced into the SO 2 chamber 250 reacts with the nitrogen oxides (NOx) in the exhaust gas by the catalyst while passing through the reaction zone (catalyst layer) composed of a plurality of catalysts, thereby reducing the nitrogen oxides to nitrogen and water.

The catalyst generally has a plurality of open cells of a predetermined length, such as a honeycomb type or a mesh type, so that the exhaust gas can pass therethrough.

Therefore, the exhaust gas passes through the cell and undergoes a catalytic reaction, whereby the nitrogen oxides are reduced to nitrogen and water.

However, in the conventional ESC chamber as described above, a mixer line for mixing the exhaust gas and the urea water is required. At this time, the mixer line has a certain time and temperature condition for uniform mixing and reaction of the exhaust gas and urea water It must be installed to have a predetermined length.

Therefore, since the external piping is inevitably lengthened for installing the mixer line, it is difficult to secure the installation space due to the spatial limitation of the engine room, and space utilization is remarkably deteriorated.

In order to solve such a problem, conventionally, a propeller or a plurality of vanes is installed in a mixer line to induce rapid mixing of exhaust gas and urea water, thereby minimizing the length of the mixer line However, in this case as well A minimum length for converting urea into ammonia is required, and there is also a problem such as an increase in production cost, a complicated structure of the mixer, and uncomfortable maintenance.

Korean Patent Registration No. 10-0844750 (Jul. 1, 2008)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mixing tube in an essil chamber which can effectively mix exhaust gas and urea by securing a sufficient length of a mixing tube, , And also to provide a mixer-integrated ESR chamber in which the ESR chamber is compactly integrated with a mixer so that a separate space for installing the mixer is not required.

According to an aspect of the present invention, there is provided an ESR chamber in an engine exhaust line for removing nitrogen oxide contained in an engine exhaust gas,

At least one catalytic stage installed in the chamber housing for allowing the exhaust gas to pass therethrough and composed of a plurality of catalysts, A mixing pipe connected to the engine exhaust line and provided with an inflow path of a predetermined length in the chamber housing so that the exhaust gas can pass through the inflow path and then pass through the catalyst end; And an exhaust port for exhausting one exhaust gas to the outside of the chamber housing.

Wherein the mixing pipe is installed through the catalyst end.

Meanwhile, the chamber housing is provided with a partition wall such that an inner region thereof is separated into a reaction region in which the mixing pipe and the catalyst end are installed, and the partition wall includes a communication path connecting the inlet passage and the reaction region.

Further, the chamber housing may be provided with a support for supporting a front portion and a rear portion of the catalyst end.

In this case, it is preferable that the support is provided with a radial structure or a lattice structure in which a plurality of supports are spaced apart and installed radially.

The support may be a mesh structure or a wire mesh structure.

As described above, according to the present invention, it is possible to uniformly mix the exhaust gas and the urea water by securing a sufficient length of the mixing pipe, thereby improving the efficiency of the SIS chamber. Further, In addition, it is not necessary to secure a separate space for installing the mixer, which can improve the space utilization of the engine room.

1 is a schematic view of a general engine exhaust line equipped with a conventional SIS chamber,
FIG. 2 is a perspective view of a mixer-integrated SIS chamber according to an embodiment of the present invention, FIG.
Fig. 3 is a central sectional view of Fig. 2,
4 is a perspective view of one embodiment of a support and a catalyst end provided in the present invention,
5 is an operational explanatory view of the mixer-integrated SIS chamber of the present invention,
6 is a perspective view of a mixer-integrated SIS chamber of another embodiment of the present invention,
7 is an operational explanatory view of the embodiment of Fig.

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

FIG. 2 is a perspective view of an SIS chamber with a mixer according to an embodiment of the present invention. FIG. 3 is a sectional view of the SIS chamber of FIG. 2. FIG. 4 is a cross- FIG.

The SCR chamber integrated with the mixer of the present invention serves to remove NOx, which is nitrogen oxide contained in the exhaust gas, through a catalytic reaction.

That is, the SCR chamber uses ammonia (NH3) or urea as a reducing agent to reduce nitrogen oxides (NOx) in the exhaust gas to nitrogen and water, and to discharge the nitrogen oxides (NOx).

Therefore, the mixer-integrated ESC chamber of the present invention is connected to the exhaust line 150 of the engine 100 in the form of one unit so that exhaust gas can pass therethrough. As shown in FIG. 2, the chamber housing 10, A catalyst end 30, a mixing pipe 50, and an exhaust port 70.

Here, the chamber housing 10 is formed in a cylindrical shape with an empty interior so as to form a certain space therein, and an opening is formed on the upper surface of the chamber housing 10 so that the mixing pipe 50 described below can be coupled therethrough.

At this time, the upper surface of the chamber housing 10 may have a dome shape or an inclined surface may be formed along the periphery of the opening.

On the other hand, an exhaust port (70) is installed on the upper surface of the chamber housing (10) so as to protrude to the outside.

The exhaust port 70 discharges the exhaust gas that has passed through the catalyst end 30 in the chamber housing 10 to the outside, and is connected to a separate exhaust pipe (not shown).

The exhaust port 70 may be installed at various positions capable of discharging the exhaust gas passing through the catalyst stage 30 as well as the upper portion of the chamber housing 10.

Here, the chamber housing 10 is not limited to the cylindrical shape as shown in the drawings, but may be formed in various shapes such as a rectangular shape in consideration of the size and characteristics of the engine 100.

The catalyst stage 30 is installed inside the chamber housing 10 and is composed of a plurality of catalysts 35 so that nitrogen oxides (NOx) react with ammonia (NH3) and are converted into nitrogen and water.

That is, the catalyst stage 30 Through the catalytic reaction, ammonia (NH3) is used as a reducing agent so that nitrogen oxides (NOx) in the exhaust gas are reduced to harmless nitrogen and water.

Wherein the catalyst stage 30 is generally comprised of a plurality of extruded or metallic coating catalysts 35.

As shown in FIGS. 3 and 4, the catalyst 35 constituting the catalyst stage 30 may be formed in the form of an open cell having a predetermined length formed by a mesh type or the like so that the exhaust gas can pass therethrough. And is composed of a plurality of closely packed structures along the longitudinal direction.

At this time, the nitrogen oxide in the exhaust gas is reduced to nitrogen and water through the catalyst 35 while passing through the catalyst 35.

Here, the catalyst stage 30 is a region in which a catalyst applied to a general selective catalytic reduction (SCR) is installed.

Therefore, the catalyst stage 30 may be provided in a cylindrical or square shape having a predetermined thickness, in which a plurality of catalysts 35 in the form of hollow cells are densely installed in the interior of the chamber housing 10 according to the shape of the chamber housing 10, At least one catalyst stage (30) is installed inside the catalyst stage (10).

At this time, it is preferable that the catalyst end 30 is installed to be spaced apart by a certain distance.

Accordingly, the chamber housing 10 includes two catalyst stages 30 in which a plurality of catalysts 35 are installed in the form of a module, as shown in the figure, so that the interior of the chamber housing 10 is divided into a plurality of reaction zones It can be constituted by two stages.

Here, the catalyst end 30 may be installed in the chamber housing 10 in various shapes and numbers corresponding to the size, length, or shape of the chamber housing 10.

Meanwhile, a mixing pipe 50 is installed inside the chamber housing 10.

The mixing pipe 50 is provided in the form of a hollow pipe or a square pipe to secure a time for converting urea water (urea) injected into the exhaust gas passing through the inside into ammonia, A device such as a vane, a mixer or the like may be provided inside so that the ammonia can be evenly mixed with the exhaust gas.

The upper end of the mixing pipe 50 is connected to the exhaust line 150 of the engine 100 and is configured to sequentially penetrate through the opening provided in the upper surface portion of the chamber housing 10 and the catalyst end 30 .

At this time, the lower end of the mixing pipe 50 is connected to the catalyst stage 30 so that the introduced exhaust gas flows to the catalyst stage 30. [ And is spaced apart from the bottom surface 15 of the chamber housing 10 by a predetermined distance.

On the other hand, the chamber housing 10 is provided with a plurality of supports 20.

The support 20 serves to fix the mixing pipe 50 and to support the catalyst end 30. The support 20 is provided so as to be coupled to the mixing pipe 50. As shown in Figures 3 and 4, Are disposed on the front and rear surfaces of the catalyst stage 30, respectively.

Here, the support 20 may have a radial structure in which a plurality of supports 25 are radially provided between two annular support frames 21 and 23 of different diameters.

Therefore, the support 20 is coupled to the mixing pipe 50 and is installed so as to be in close contact with the front surface and the rear surface of the catalyst stage 30, thereby supporting the catalyst stage 30. [

Here, the support 20 is not limited to a radial frame structure as shown, but may be provided in various forms such as a mesh structure or a wire mesh structure capable of minimizing disturbance to the flow of a lattice structure or an exhaust gas .

Therefore, the mixer-integrated ESC chamber of the present invention is provided with the mixing pipe 50 penetrating the center portion of the chamber housing 10 and at least one catalyst end 30 being integrally installed in the mixing pipe 50 And the catalyst stage 30 are integrated into the chamber housing 10 so that they can be easily attached to and detached from the exhaust line 150.

Hereinafter, the operation of the mixer integrated SIS chamber of the present invention will be described in detail with reference to FIG.

5 is an explanatory view for explaining the operation of the S mix chamber with integrated mixer of the present invention.

5, the upper end of the mixing pipe 50 is connected to the exhaust line 150 so that the exhaust gas can pass therethrough.

At this time, the exhaust line 150 is provided with a charging port 160 for charging urea water.

Accordingly, the exhaust gas mixes with the urea water introduced from the inlet 160 and enters the mixing pipe 50 as shown by an arrow, and moves downward.

At this time, since the mixing pipe 50 can secure a sufficient length, the urea water is uniformly mixed with the exhaust gas in the process of moving the mixing pipe 50 and converted into ammonia.

On the other hand, the exhaust gas and the ammonia collide with the bottom surface 15 of the chamber housing 10 while escaping from the lower end of the mixing pipe 50 as shown by the arrow, ) Sequentially.

Thus, the catalyst 35 reacts ammonia with nitrogen oxides in the exhaust gas, and the ammonia reacts with the nitrogen oxides as a reducing agent, thereby converting the nitrogen oxides into nitrogen and water.

The exhaust gas is exhausted to the outside of the chamber housing 10 through the exhaust port 70 after completing the reaction while passing through the catalyst stage 30 as described above.

Hereinafter, another embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 6 is a perspective view of a mixer-integrated SIS chamber of another embodiment of the present invention, and FIG. 7 is an explanatory view of the operation of the embodiment of FIG.

6 shows a state in which the front part is separated for convenience of explanation.

As shown, the chamber housing 300 can be manufactured in the form of a rectangular box, and partition walls 315 are installed therein.

The partition wall 315 separates the interior of the chamber housing 300 into a mixing pipe 350 providing an exhaust gas inflow passage 357 and a reaction zone 335 in which a plurality of catalyst stages 330 are spaced apart.

The partition wall 315 is formed such that the front end thereof is spaced from the bottom surface of the chamber housing 300 by a predetermined distance so that the communication passage 317 is formed so that the exhaust gas passing through the inlet passage 357 of the mixing pipe 350 flows into the reaction zone (335).

While the catalyst stages 330 may be spaced apart from one another along the reaction zone 335.

Here, a support 320 is installed on the front and rear surfaces of the catalyst stage 330.

The support 320 may be provided in various structures as in the embodiment of FIG.

A connection port 355 to be connected to the engine exhaust line is provided on the mixing pipe 350 of the chamber housing 300 and an exhaust port 370 is provided on the reaction zone 335.

6, the exhaust gas flowing into the mixing pipe 350 flows through the communication path 317 to the catalyst stage 330 installed in the reaction zone 335, as shown in FIG. And then discharged to the outside through the exhaust port 370. [

The mixing chamber 350 and the reaction zone 335 and the catalyst stage 330 are also connected to the chamber housing 300. The chamber housing 300 is not limited to the rectangular box shape, And a semi-cylindrical structure corresponding to the shape of the cylinder.

Accordingly, the present invention can provide a sufficient mixing length without installing a separate mixer line in the exhaust line 150 by integrally integrating the mixing pipes 30, 350 for mixing the exhaust gas and the urea water into the chamber housings 10, Thus, the exhaust gas and urea water can be effectively mixed with each other, and it is easy to install and dismantle, and it is not necessary to secure a separate space for installation, and space utilization can be improved.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities.

Description of the Related Art [0002]
10,300: chamber housing 15: bottom surface
20,320: Support 21,23: Support frame
25: support stand 30,330: catalyst stage
35: Catalyst 50, 350: Mixing tube
70,370: exhaust port 100: engine
150: exhaust line 160; Inlet
210: Mixer line 250: Essil chamber
315: partition wall 317:
335: reaction zone 355:
357: Inflow path

Claims (6)

An essil chamber (100) installed in an engine exhaust line (100) for removing nitrogen oxides contained in engine exhaust gas,
The S-
A chamber housing defining a predetermined space therein;
At least one catalytic converter installed in the chamber housing for allowing the exhaust gas to pass therethrough, the catalytic converter being composed of a plurality of catalysts;
A mixing pipe connected to the engine exhaust line and provided in the chamber housing to provide an inflow path of a predetermined length so that the exhaust gas can pass through the inflow path and then pass through the catalyst end; And
An exhaust port for exhausting the exhaust gas passed through the catalyst end to the outside of the chamber housing;
Wherein the mixer-integrated SIS chamber is made of a metal. The method according to claim 1,
Wherein the mixing pipe is installed through the catalyst end. The method according to claim 1,
Wherein the chamber housing is provided with a partition wall such that an inner region of the chamber housing is separated into a reaction region in which the mixing pipe and the catalyst end are installed, and the partition wall has a communication path connecting the inlet passage and the reaction region. Integrated ES chamber. 4. The method according to any one of claims 1 to 3,
Wherein the chamber housing is provided with a support for supporting a front portion and a rear portion of the catalyst end, respectively. 5. The method of claim 4,
Wherein the support is provided with a radial structure or a lattice structure in which a plurality of supports are spaced apart and radially installed. 5. The method of claim 4,
Wherein the support comprises a mesh structure or a wire mesh structure.

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