KR20130016581A - Scr reactor in ship or marin structure - Google Patents

Abstract

PURPOSE: An SCR(Selective Catalytic Reduction) reactor of a ship or a marine structure is provided to increase space operability, to omit elements and components which are used for protecting and insulating an external by-pass pipe, and to minimize the pressure loss of an exhaust pipe. CONSTITUTION: An SCR reactor of a ship or a marine structure includes a housing(10) inside which a main exhaust path and a by-pass path. The main exhaust path is placed between the inlet and the outlet of the housing. A catalyst for reaction with an exhaust gas is placed inside the main exhaust path. The by-pass path diverts exhaust gas which flows in the inlet so that the exhaust gas cannot pass through the main exhaust path, and sends the exhaust gas to the outlet. A first path change unit(16a) and a second path changing unit(16b) are respectively installed at the inlet and the outlet so that one of the main exhaust path and the by-pass path can be selectively connected to the inlet and the outlet. The by-pass path is restrictively formed inside a by-pass pipe of which the inlet end and the outlet end are connected to the inlet and the outlet by the first path change unit and the second path changing unit, and the main exhaust path is restrictively formed outside a by-pass pipe.

Description

SCR REACTOR IN SHIP OR MARIN STRUCTURE}

The present invention relates to an SCR reactor used to reduce nitrogen oxides (NOx) in exhaust gas in a ship or offshore structure, and more particularly, an SCR reactor of a ship or offshore structure including a bypass passage to bypass the exhaust gas. It is about.

SCR is used to reduce NOx, ie NOx, in the exhaust gas generated during operation of a ship or offshore structure. For example, SCR is used to remove NOx generated in a ship's engine or boiler. The SCR exhaust gas purifying apparatus is a NOx abatement apparatus using a selective catalytic reduction method, and is configured to react NOx with a reducing agent while simultaneously reducing exhaust gas and a reducing agent in a catalyst to reduce treatment with nitrogen and water vapor.

In marine structures such as ships, SCR reactors are installed as part of the exhaust gas purification system to reduce NOx in accordance with environmental regulations. In the case of ships, since the area where the operation is unnecessary is larger than the area where the SCR reactor should be operated, an additional exhaust gas bypass pipe is additionally installed outside the SCR reactor to prevent unnecessary use of the SCR reactor.

1 is a view showing a conventional SCR reactor installed in a ship or the like and the bypass pipe is coupled to the outside.

Referring to FIG. 1, a conventional SCR reactor includes a housing 1 in which a catalyst (not shown) is embedded. The housing 1 comprises an inlet 1a and an outlet 1b having a relatively very small cross-sectional area. The bypass tube 3 is located outside the housing 1, and both ends of the bypass tube 3 are connected to the inlet 1a and the outlet 1b of the housing 1, respectively. Each of the inlet and outlet 1b of the housing has an inlet opening and closing unit 2a and a outlet opening and closing unit, such as a damper or valve, so that exhaust gas can be selectively entered and exited into the housing 1 in which the catalyst is embedded. (2b) is installed. In the state where the inlet opening / closing unit 2a and the outlet opening / closing unit 2b open the inlet 1a and the outlet 1b, the exhaust gas is inside the SCR reactor, more specifically, the catalyst-embedded housing 1 ), In the process occurs a catalytic reaction to reduce NOx through a catalytic reaction.

When the operation of the SCR reactor is unnecessary, each of the inlet opening and closing unit 2a and the outlet opening and closing unit 2b closes the inlet 1a and the outlet 1b of the housing 1, whereby the exhaust gas is discharged from the SCR reactor. It does not pass through the inside of the housing 1 and flows bypass the SCR reactor through the bypass pipe 3.

However, in the conventional case, when the SCR reactor is installed, a separate bypass pipe 3 must be provided on the outside of the housing 1, and thus, additional installation space must be secured and the installation space can be bypassed. Careful consideration should be given in terms of back pressure loss, flow rate reduction, soot congestion, etc., and additional elements and components for warming and protecting the bypass tube 3 outside of the housing 1 must be consumed.

Accordingly, one problem to be solved by the present invention is to integrate the bypass passage of the exhaust gas into the housing of the SCR reactor, thereby improving space operability and eliminating elements and components that have been used to protect and insulate the external bypass pipe. It is to provide an economical and stable SCR reactor for ships or offshore structures.

According to an aspect of the present invention there is provided an SCR reactor comprising a housing in which a catalyst is embedded and installed in a ship or offshore structure. The SCR reactor is located between the inlet and the outlet of the housing, the main exhaust passage in which the catalyst for the reaction with the exhaust gas is located; A bypass passage is provided inside the housing to bypass exhaust gas entering the inlet without passing through the main exhaust passage to the outlet.

According to one embodiment, a first path changing unit and a second path changing unit installed at the inlet and the outlet to selectively connect one of the main exhaust passage and the bypass passage to the inlet and the outlet. .

According to one embodiment, the bypass passage is formed in the interior of the bypass pipe is connected to the inlet and the outlet is connected to the inlet and the outlet by the first path changing unit and the second path changing unit, The main exhaust passage is limitedly formed outside the bypass pipe.

According to one embodiment, the bypass tube is located in the center of the housing and the main exhaust passage is positioned to surround the bypass tube in the housing.

According to the present invention, the bypass passage of the exhaust gas is integrated inside the housing of the SCR reactor, thereby improving space operability and eliminating the existing elements and components that have been used for external bypass pipe protection and insulation. More economical. In addition, by placing the exhaust gas bypass passage in the center of the housing of the SCR reactor, it is possible to significantly reduce the installation space and minimize the pressure loss of the exhaust pipe.

1 is a view for explaining the SCR reactor that was conventionally installed on a ship or offshore structure.
Figure 2 is a perspective view of the SCR reactor of the ship or offshore structure according to an embodiment of the present invention.
3 (a) and 3 (b) are diagrams for explaining a state in which a catalytic reaction occurs in an SCR reactor according to an embodiment of the present invention, and a state in which exhaust gas is exhausted through a bypass passage without a catalytic reaction, respectively; field.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the same reference numerals denote the same components, and the width, length, thickness, etc. of the components may be exaggerated for convenience.

2 is a perspective view showing an SCR reactor of a ship or offshore structure according to an embodiment of the present invention. In FIG. 2, important parts of the parts not exposed to the outside are indicated by dotted lines, and elements that need to be distinguished from some other elements are marked by hatching.

2, an SCR reactor according to an embodiment of the present invention includes a housing 10 in which a catalyst (not shown) is embedded. In the drawings, the inlet 11a and outlet 11b of the exhaust gas having a relatively small cross-sectional area are formed in each of the lower center of the housing 10 and the upper center of the housing 10. Although not shown, each of the inlet 11a and the outlet 11b is connected to the exhaust gas pipe outside the housing 10.

In addition, the SCR reactor includes a bypass tube 14 installed or formed to penetrate the center of the housing 10. The housing 10 includes an SCR catalyst (not shown) in the outer space of the bypass pipe 14. That is, the outer space of the bypass pipe 14 in the housing 10 is the main exhaust passage for the SCR catalytic reaction as the exhaust gas flows, and the space defined inside the bypass pipe 14 is the SCR catalytic reaction. If not necessary, the exhaust gas is diverted away from the main exhaust passage to become a bypass passage of the exhaust gas flowing without catalytic reaction.

The SCR reactor may include a first path changing unit configured to change or switch the flow of exhaust gas into one of a bypass passage defined to the inside of the bypass pipe 14 and a main exhaust passage defined to the outside of the bypass pipe 14. 16a) and second path change unit 16b. Each of the first path changing unit 16a and the second path changing unit 16b may be a combination of a plurality of dampers, a plurality of passage openers or a plurality of open / close valves.

The inlet end of the bypass pipe 14 is connected to the exhaust gas inlet 11a of the housing 10 by the first path changing unit 16a, and the outlet end of the bypass pipe 14 is It is connected to the exhaust gas outlet 11b of the housing 10. The exhaust gas flowing into the housing of the SCR reactor by the path change (or switching) of the first change unit 16a and the second change unit 16b is bypassed in the bypass pipe 14. It flows through the passage or through the main exhaust passage outside the bypass pipe 14.

(A) and (b) of FIG. 3 respectively show a state in which the operation of the SCR reactor is performed, that is, a state in which the SCR catalyst reaction is performed, and a state in which the SCR reactor is not operated, that is, a state in which the exhaust gas is discharged without the SCR catalyst reaction. Shows each.

Referring to FIG. 3A, the first path changing unit 16a and the second path changing unit 16b are formed of the main exhaust passage 10a defined outside the bypass pipe 14 in the housing 10. While the inlet end and the outlet end are opened, the inlet end and the outlet end of the bypass passage 14a defined inside the bypass pipe 14 in the housing 10 are closed. In the state shown in FIG. 3A, since the exhaust gas flows through the main exhaust passage 10a in which the catalyst 17 is located, a catalytic reaction to reduce NOx occurs.

Referring to FIG. 3B, the first path changing unit 16a and the second path changing unit 16b are formed of the bypass passage 14a defined inside the bypass pipe 14 in the housing 10. While the inlet end and the outlet end are opened, the inlet end and the outlet end of the main exhaust passage 10a defined outside the bypass pipe 14 in the housing 10 are closed. In the state shown in FIG. 3B, the exhaust gas passes through the bypass passage 14a without the catalyst 17, but does not pass through the main exhaust passage 10a with the catalyst 17. No reaction takes place.

Although the bypass passage is integrated in the housing, the formation of the bypass tube passing along the outer wall of the housing may also be considered, but this may cause a large pressure loss due to rapid flow path change.

10: housing 10a: main exhaust passage
11a: entrance 11b: exit
14: bypass tube 14a: bypass passage
16a: first path changing unit 16b: second path changing unit
17: catalyst

Claims (4)

In the SCR reactor including a housing in which the catalyst is embedded and installed in a ship or offshore structure,
A main exhaust passage located between the inlet and the outlet of the housing and having a catalyst for reaction with the exhaust gas;
Bypass the exhaust gas entering the inlet not to pass through the main exhaust passage to the exit
SCR reactor of the ship or offshore structure, characterized in that included in the housing. 2. The apparatus of claim 1, further comprising a first route change unit and a second route change unit installed at the inlet and the outlet to selectively connect one of the main exhaust passage and the bypass passage to the inlet and the outlet. SCR reactor of a ship or offshore structure. 3. The bypass passage of claim 2, wherein an inlet end and an outlet end are limitedly formed in a bypass pipe connected to the inlet and the outlet by the first path changing unit and the second path changing unit. SCR reactor of the ship or offshore structure, characterized in that the main exhaust passage is limited to the outside of the pass pipe. 4. The SCR reactor of claim 3 wherein the bypass pipe is located in the center of the housing and the main exhaust passage is positioned to surround the bypass pipe within the housing.

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