WO2014084541A1

WO2014084541A1 - Communal denitrification system for multiple engines

Info

Publication number: WO2014084541A1
Application number: PCT/KR2013/010536
Authority: WO
Inventors: 이수태; 송옥렬; 송민제
Original assignee: 주식회사 파나시아
Priority date: 2012-11-27
Filing date: 2013-11-20
Publication date: 2014-06-05
Also published as: KR101335308B1

Abstract

The present invention relates to a selective catalytic reduction (SCR) denitrification system for denitrifying exhaust gas, and more specifically, to a communal denitrification system for multiple engines, wherein exhaust gas of multiple exhaust pipes is denitrified communally by using a communal reactor body which connects the multiple exhaust pipes guiding the exhaust gas discharged from the multiple engines, respectively, thereby minimizing a space occupied by a reactor (denitrification system) and preventing back pressure in the communal reactor body for connecting the multiple exhaust pipes as one through a separation plate which partitions and isolates the inside of the communal reactor body for connecting the multiple exhaust pipes as one so as to prevent the exhaust gas entering from each exhaust pipe from mixing with the exhaust gas of another exhaust pipe or flowing into the other exhaust pipes.

Description

Joint denitrification system for multiple engines

The present invention relates to an SCR denitrification system for denitrification of exhaust gas, and more particularly, exhaust gas of a plurality of exhaust pipes by using a joint reaction body which connects a plurality of exhaust pipes inducing exhaust gas respectively discharged from a plurality of engines into one. By enclosing the gas and jointly denitrifying, the space occupied by the reactor (denitrification system) can be minimized, and the exhaust gas flowing from each exhaust pipe is mixed with the exhaust gas of the other exhaust pipe inside the common reaction body that connects the multiple exhaust pipes together. A separator that separates and prevents flow to other exhaust pipes prevents back pressure from forming inside the joint reaction body that connects multiple exhaust pipes into one, and lengthens them in the vertical length direction to induce exhaust gas in the vertical direction. Prolonged front, rear, left and right Engine damage due to backflow of exhaust gas through back pressure through a backflow prevention valve that minimizes the space occupied by the denitrification system by allowing exhaust pipes to be connected to the exhaust pipe and prevents backflow of exhaust gas to the areas where each exhaust pipe is connected to the joint reaction body. It relates to a joint denitrification system for a number of engines that can prevent.

Emissions from the combustion of fossil fuels from engines to obtain heat sources and power inevitably contain nitrogen oxides (NOx), which have been found to cause light smog, acid rain and respiratory diseases. It is seriously pointed out. Therefore, recently, NOx emission control has been strengthened, and in response to this, NOx removal technology has been utilized in various exhaust gases. Among them, SCR (Selective Catalytic) using ammonia as a reducing agent is particularly used. Reduction (selective reduction catalyst) technology has been applied in various ways.

Referring to FIG. 1, the SCR denitrification system uses a spray nozzle with a reducing agent, urea water (which becomes ammonia when urea water is vaporized), used to denitrify nitrogen oxides (NOx) in the exhaust gas discharged from the engine 91. 951) is introduced into the reactor 94 containing the SCR catalyst 944 by injecting the mixed gas in which the exhaust gas and the reducing agent are mixed into the mixing chamber 93 through the exhaust gas and the reducing agent in the reactor 94. As the mixed gas passes through the SCR catalyst 944, it denitrates (denitrates) the nitrogen oxide (NOx) component contained in the exhaust gas to obtain an optimum denitrification efficiency and to reduce environmental pollution caused by nitrogen oxide (NOx) component or ammonia. It adopts the structure which prevents efficiently.

However, since the conventional SCR denitrification system only takes an independent structure in which the exhaust gas discharged from one engine is connected to and treated with one reactor 94, it is necessary to treat the exhaust gas emitted from a plurality of engines. In the case of installing the SCR denitrification system, as illustrated in FIG. 2, the exhaust pipe 92 through which the exhaust gas discharged from one engine 91 flows is connected to one reactor 94 to denitrify and discharge the other engine. The exhaust pipe 92 through which the exhaust gas discharged from the 91 flows is arranged in parallel with the number of the engines 91 so that the exhaust pipe 92 connected to the other reactor 94 to be denitrated and discharged is installed. As the number of systems increases, the installed space (the occupied space) becomes large. However, the installation space of the denitrification system can be minimized, especially when the SCR denitrification system for treating the exhaust gas from several engines is to be installed, especially in places where the space for the installation of the SCR denitrification system, such as ships, is restricted. There is a growing need for more structure.

However, if a plurality of exhaust pipes are connected to one reactor at the same time by simply increasing the capacity of the reactor, various other problems may occur due to the formation of back pressure in the reactor due to loads of different engines.

The present invention has been made to solve the above problems,

It is an object of the present invention to minimize the space occupied by tying exhaust gases from a plurality of exhaust pipes by jointly denitrifying them using a joint reaction body that connects a plurality of exhaust pipes inducing exhaust gas discharged from a plurality of engines into one. It is to provide a joint denitrification system for many engines.

Another object of the present invention is that the exhaust gas flowing from each exhaust pipe is mixed with the exhaust gas of the other exhaust pipe or flows into the other exhaust pipe inside the joint reaction main body which connects the multiple exhaust pipes which respectively induce exhaust gas discharged from the multiple engines into one. It is to provide a joint denitrification system for a number of engines that can fundamentally prevent the formation of back pressure in the joint reaction body that connects a plurality of exhaust pipes through a separator that separates them.

Still another object of the present invention is that the separator isolating the interior of the joint reaction body is extended in the vertical longitudinal direction to guide the exhaust gas flowing from each exhaust pipe in the vertical direction, so that the exhaust pipe in the front, rear, left and right of the joint reaction body It provides a joint denitrification system for a number of engines that can be connected to minimize the space taken by the denitrification system.

Still another object of the present invention is to provide a plurality of engines capable of preventing engine damage caused by backflow of exhaust gas through back pressure through a backflow prevention valve that prevents backflow of exhaust gas at a portion where the respective exhaust pipes are connected in the joint reaction body. It is to provide a joint denitrification system.

Still another object of the present invention may further include a rupture plate that is opened upon occurrence of a reverse flow of exhaust gas above a predetermined pressure on each line of a plurality of exhaust pipes to prevent backflow of the exhaust gas, thereby preventing engine damage due to the reverse flow of exhaust gas. It is to provide a joint denitrification system for many engines.

Joint denitrification system for a number of engines for achieving the above object of the present invention includes the following configuration.

The joint denitrification system for a plurality of engines according to an embodiment of the present invention includes: a joint reaction body connected with a plurality of exhaust pipes for inducing exhaust gases respectively discharged from the plurality of engines; A separator for separating and separating the inside of the joint reaction body by the number of connected exhaust pipes so that the exhaust gas introduced from each exhaust pipe in the joint reaction body does not mix with the exhaust gas of the other exhaust pipe or flow to the other exhaust pipe; An SCR catalyst installed separately in each compartment separated by the separator; It includes a plurality of outlets for discharging the exhaust gas denitrified by the SCR catalyst; to prevent the formation of back pressure through the isolation structure while minimizing the space occupied by bundling the exhaust gas of the plurality of exhaust pipes and jointly denitrification It features.

According to another embodiment of the present invention, in the joint denitrification system for a plurality of engines according to the present invention, further comprising a non-return valve for preventing backflow of exhaust gas at a portion where the respective exhaust pipes are connected in the joint reaction body. It features.

According to another embodiment of the present invention, in the joint denitrification system for a plurality of engines according to the present invention, the separator extends in the vertical lengthwise direction to guide the exhaust gas flowing from each exhaust pipe in the vertical direction. By partitioning the interior of the joint reaction main body, exhaust pipes can be connected to the front, rear, left and right sides of the joint reaction main body, and the space occupied by the denitrification system can be minimized.

According to another embodiment of the present invention, in the joint denitrification system for a plurality of engines according to the present invention, on each line of the exhaust pipes, a rupture plate is opened to prevent the reverse flow of exhaust gas by opening when a reverse flow of the exhaust gas exceeds a predetermined pressure. It is characterized by including.

The present invention can obtain the following effects by the configuration, combination, and use relationship described above with the present embodiment.

The present invention has the effect of minimizing the space occupied by bundling the exhaust gases of a plurality of exhaust pipes jointly by denitrification by using a joint reaction body that connects a plurality of exhaust pipes inducing exhaust gas discharged from a plurality of engines into one. Have

The present invention is to separate the compartment so that the exhaust gas flowing from each exhaust pipe does not mix with the exhaust gas of the other exhaust pipe or flow into the other exhaust pipe inside the joint reaction body which connects the plurality of exhaust pipes respectively inducing exhaust gas discharged from the multiple engines into one. It is possible to fundamentally prevent the formation of back pressure in the joint reaction body that connects a plurality of exhaust pipes through a separator.

The present invention is such that the separator isolating the interior of the joint reaction body is extended in the vertical longitudinal direction to guide the exhaust gas flowing from each exhaust pipe in the vertical direction, so that the exhaust pipe can be connected in front, rear, left and right of the joint reaction body. It has the effect of minimizing the space occupied by the denitrification system.

The present invention has an effect that can prevent the engine damage due to the back flow of the exhaust gas through the back pressure through the back flow prevention valve to prevent the back flow of the exhaust gas to the site where the respective exhaust pipes are connected in the joint reaction body.

The present invention further includes a rupture plate that is opened upon occurrence of a reverse flow of exhaust gas above a predetermined pressure on each line of the plurality of exhaust pipes to prevent the reverse flow of exhaust gas, thereby preventing the engine damage due to the reverse flow of exhaust gas.

Figure 1 is a schematic diagram showing the structure of a conventional SCR denitrification system

2 is an installation diagram of an SCR denitrification system installed to process exhaust gas from a plurality of conventional engines.

3 is an installation diagram of a joint denitrification system for multiple engines according to an embodiment of the present invention.

4 is a cross-sectional plan view of the co-reaction main body of FIG.

5 is a cross-sectional view taken along the line AA ′ of FIG. 4;

FIG. 6 is a cross-sectional view taken along the line BB ′ in FIG. 4.

7 is a reference diagram illustrating a process in which the rupture plate is operated.

Hereinafter, preferred embodiments of a joint denitrification system for a plurality of engines according to the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

3 to 7, a joint SCR (Selective Catalytic Reduction) method for a plurality of exhaust pipes 12 according to an embodiment of the present invention for treating exhaust gases emitted from a plurality of engines 11. The denitrification system includes a common reaction body 15 to which a plurality of exhaust pipes 12 for inducing exhaust gas respectively discharged from the plurality of engines 11 are connected; An exhaust pipe connected inside the joint reaction body 15 such that the exhaust gas flowing from each exhaust pipe 12 in the joint reaction body 15 does not mix with the exhaust gas of the other exhaust pipe 12 or flow to the other exhaust pipe 12. A separator 153 which is partitioned and separated by the number of 12); An SCR catalyst 154 separately installed in each compartment separated by the separator 153; Including a plurality of outlets 152 for discharging the exhaust gas denitrified by the SCR catalyst 154, including the exhaust gas of the plurality of exhaust pipes 12 to bundle and denitrification jointly to minimize the space occupied It is characterized by preventing the formation of back pressure through the structure.

As previously described in the prior art, SCR (Selective Catalytic Reduction) denitrification systems using urea (ammonia) as a reductant, particularly for the removal of NOx from exhaust gases, are discharged from the engine 91. In order to denitrify the nitrogen oxides (NOx) in the exhaust gas, a reducing agent, that is, urea water (which becomes ammonia when urea water is vaporized) is injected through the injection nozzle 951 to denitrate NOx in the exhaust gas. After the mixed gas is mixed, the mixed gas is introduced into the reactor 94 including the SCR catalyst 944, and the mixed gas in which the exhaust gas and the reducing agent are mixed in the reactor 94 is the SCR catalyst ( While passing through 944, denitrification (denitrification reaction) of nitrogen oxide (NOx) contained in the exhaust gas achieves optimum denitrification efficiency and effectively prevents environmental pollution caused by nitrogen oxide (NOx) component or ammonia. It has adopted a structure. However, since the conventional SCR denitrification system has an independent structure in which the exhaust gas discharged from one engine 91 is connected to and treated with one reactor 94, the exhaust gas discharged from a plurality of engines is removed. Even when the SCR denitrification system is installed for treatment, as illustrated in FIG. 2, the exhaust pipe 92 through which the exhaust gas discharged from one engine 91 flows is connected to one reactor 94 to denitrify and discharged. The exhaust pipe 92 through which the exhaust gas discharged from the other engine 91 flows is arranged in parallel with the number of engines 91 so as to be arranged in parallel with the number of the engines 91 so as to be connected to the other reactor 94 for denitrification and installation. Due to the increase in the space (charged space) that is directly proportional to the number of SCR denitrification systems, in particular, it is subject to spatial constraints on the installation site of the SCR denitrification system, such as ships. There is a problem that can not be installed in place. In addition, a structure in which a plurality of exhaust pipes are connected to one reactor at the same time by simply increasing the capacity of the reactor may be considered. Various other problems may be caused by the formation of back pressure in the reactor due to loads of different engines. Back pressure in the reactor may cause the exhaust gas to flow back to the engine, causing problems in the engine, and the like.

Therefore, the joint denitrification system for a plurality of engines according to the present invention uses a plurality of joint reaction bodies 15 which connect a plurality of exhaust pipes 12 which lead exhaust gases respectively discharged from the plurality of engines 11 into one. By enclosing the exhaust gas of the exhaust pipe 12 in a joint denitrification process, the space occupied can be minimized, and the inside of the common reaction body 15 through which the plurality of exhaust pipes 12 are connected together is separated from each exhaust pipe 12. Co-reaction main body 15 connecting the plurality of exhaust pipes 12 together through a separator 153 which separates and separates the incoming exhaust gas from the exhaust gas of the other exhaust pipe 12 or flows into the other exhaust pipe 12. It is possible to fundamentally prevent the formation of back pressure in the interior.

Unlike the related art, the co-reaction main body 15 connects a plurality of exhaust pipes 12 into one and causes denitrification reaction by contacting the SCR catalyst 253 installed therein with the exhaust gas introduced from the various exhaust pipes 12 inside. It is the part that forms the overall skeleton of the reactor that allows oxides to be removed. In particular, the co-reaction base 15 used in the present invention forms a plurality of inlet 151 in one co-reaction base 15 and a plurality of exhaust pipes 12 for exhausting the exhaust gas from the engine 11 By connecting them to each inlet 151, structurally solve the problem (see Fig. 2) that takes up a lot of space generated by having to install a number of reactors individually according to the number of engines as in the prior art, As shown in FIG. 3, the exhaust gas flowing from the plurality of exhaust pipes 12 can be treated with only the space occupied by the joint reaction body 15. As such, if the area occupied by the reactor used in the denitrification system can be reduced, the flexibility of the denitrification system installation can be exerted, especially in places where many places are restricted in the installation place such as ships. Installation or dismantling also has the advantage of being easy.

The separator 153 has a joint reaction body such that the exhaust gas flowing from each exhaust pipe 12 in the joint reaction body 15 does not mix with the exhaust gas of the other exhaust pipe 12 or flow to the other exhaust pipe 12. 15) It is the structure which isolates and divides the inside as many as the number of the exhaust pipe 12 connected.

As mentioned above, a simple structure in which a large number of exhaust pipes of several engines are connected to the reactor by simply increasing the capacity of the conventional reactor (that is, increasing the volume of the reactor), in the reactor at this time, Of the exhaust gases from each of the exhaust pipes, and the pressure of the exhaust gases from each exhaust pipe into the reactor is different depending on the load of the engines connected to the exhaust pipes. If it is relatively weak compared to other engines, the pressure of the exhaust gas from the exhaust pipe connected to the specific engine in which the load is weak compared to the pressure in the reactor (that is, the back pressure) is lowered. To reverse the load to the engine, It can cause problems.

Therefore, in the present invention, as shown in FIGS. 4 to 6, the space in the joint reaction body 15 to which the plurality of exhaust pipes 12 are connected is introduced from each exhaust pipe 12 by using the separator 153. In order to prevent the exhaust gas from being mixed with the exhaust gas of the other exhaust pipe 12 or flowing to the other exhaust pipe 12, the interior of the reaction chamber 15 is separated and separated by the number of connected exhaust pipes 12. As shown in FIG. 4, the co-reaction main body 15 according to the present invention has a space in which an internal space is connected to one exhaust pipe 12 by the separator 153 and another exhaust pipe 12 is connected. In this plane as well as the front, rear, left, and right of the compartment is separated, as shown in Figures 5 and 6 also in the cross-sectional view also the space in which the work exhaust pipe 12 is connected and the space where the other exhaust pipe 12 is connected is completely partitioned isolated Because of the structure, there is no fear of mixing between the exhaust gas flowing from the work exhaust pipe 12 and the exhaust gas flowing from the other exhaust pipe 12 inside the joint reaction body 15, and the work exhaust pipe 12. Even though the pressure at which the exhaust gas is introduced from the exhaust gas and the pressure at which the exhaust gas is introduced from the other exhaust pipe 12 are different from each other, there is a concern that back pressure is formed in the joint reaction body 15 due to the different pressure difference. Shut off (ie, because different pressure differences between the compartments segregated within the co-reaction body 15 can not affect each other at all), so that the exhaust gas is discharged within the co-reaction body 15 by back pressure. The possibility of backflow to the specific exhaust pipe 12 is also eliminated.

In addition, as shown in FIGS. 5 and 6, the separator 153 has a joint reaction body within the joint reaction body 15 so as to induce exhaust gas introduced from each exhaust pipe 12 in a vertical direction. 15 extends in the vertical longitudinal direction connecting the lower surface 156 and the upper surface 157 and is formed to compartmentally separate the inside of the joint reaction body 15, and the exhaust pipe 12 connected to the joint reaction body 15. Exhaust gas flowing from the γ is vertically lifted by the separator 153 and is finally discharged through the outlet 152 after nitrogen oxide is removed while contacting the SCR catalyst 154 having a layered layer disposed in the vertical direction. do. In addition, the outlet portion 152 is also in the vertical longitudinal direction connecting the lower surface 156 and the upper surface 157 of the joint reaction body 15 in the joint reaction body 15 by the separator 153. The upper surface 157 of the joint reaction body 15 is formed in a straight line so as to coincide with the flow direction of the induced exhaust gas, so that the exhaust gas is quickly discharged without stagnation in the joint reaction body 15, thereby allowing the cavity. It helps to reduce the volume in the reaction base (15). Therefore, the exhaust pipes 12 connected to the joint reaction body 15 discharge exhaust gas vertically in the joint reaction body 15, so that the exhaust pipes 12 are disposed on the front, rear, left, and right sides of the joint reaction body 15. ), So that the number of exhaust pipes 12 that can be connected per one co-reaction body 15, that is, the number of engines 11, can be increased, resulting in a greater number of engines 11 Since the exhaust gas discharged from the denitrification system can be denitrated using a single joint reaction body 15, the space occupied by the denitrification system can be minimized.

In addition, the exhaust gas introduced into the joint reaction body 15 is returned to the engine through the exhaust pipe 12 at the site where the respective exhaust pipes 12 are connected to each other in the joint reaction body 15. It may further include a non-return valve 155 to prevent the back flow. As mentioned above, when the exhaust gas discharged from the engine flows back to the engine by the back pressure generated in the denitrification system, it affects the engine and causes engine trouble. As described above, the inlet part 151 which blocks the back pressure formation through the separator 153 partitioning the inside of the joint reaction body 15 and additionally connects the joint reaction body 15 and the exhaust pipe 12. By installing a separate non-return valve (155) to the part to take a structure to block the double. The non-return valve 155 may be formed as an electronic control control valve to prevent the reverse flow by blocking the valve when the reverse flow is detected in the inlet 151 or the exhaust pipe 12.

In addition, as illustrated in FIG. 7, each of the exhaust pipes 12 connected to the joint reaction body 15 may be opened when the reverse flow of the exhaust gas of a predetermined pressure or more may be opened to prevent the reverse flow of the exhaust gas. It may further include. As illustrated in FIG. 7, the rupture plate 121 is installed at a specific site or branched from a specific site on the line of the exhaust pipe 12. When applied to the rupture plate 121, the rupture plate 121 is ruptured so that the exhaust gas flowing in the opposite direction to the exhaust pipe 12 due to the reverse flow is discharged to the outside air through the opening formed by the rupture of the rupture plate 121. . That is, as mentioned above, if the exhaust gas discharged from the engine flows back to the engine by the back pressure generated in the denitrification system, the engine may be affected by causing the engine trouble. When the reverse flow of the exhaust gas by the back pressure is detected in the exhaust pipe 12, the bursting plate 121 formed in the exhaust pipe 12 is ruptured so that an opening communicating with the outside in the exhaust pipe 12 is formed so that the exhaust gas flows backward. It is an additional configuration that allows the engine to be released to the outside before entering the engine to protect the engine from the backflow of exhaust gases. As illustrated in FIG. 7, the rupture plate 121 is installed in a pipe branched so as to protrude obliquely in a direction in which exhaust gas flows back from the exhaust pipe 12, that is, in a direction in which the exhaust gas flows toward the engine 11. In addition, the back pressure due to the reverse flow of the exhaust gas can be transmitted to the rupture plate 121 well, and the exhaust gas flowing back when the rupture of the rupture plate 121 is easily discharged to the outside through the opening formed by the rupture of the rupture plate 121. do.

As described above, the joint denitrification system for a plurality of engines according to the present invention uses a plurality of exhaust pipes by using a common reaction body 15 for connecting a plurality of exhaust pipes 12 for inducing exhaust gas respectively discharged from the plurality of engines. Co-reaction base unit 15 which connects a plurality of exhaust pipes 12 which induce exhaust gas discharged from a plurality of engines as one, while minimizing the space occupied by binding and exhausting the exhaust gas of (12). ) Isolating the inside of the separator plate 153 or the joint reaction body 15 to separate the exhaust gas flowing from each exhaust pipe 12 so as not to mix with the exhaust gas of the other exhaust pipe 12 or flow into the other exhaust pipe 12. The backflow prevention valve 155 which detects and blocks the reverse flow of the exhaust gas at the inlet 151, or exhaust gas of a certain degree or more on the line of each exhaust pipe 12 Back pressure formation within the joint reaction body 15 connecting the plurality of exhaust pipes 12 through the configuration of a rupture plate 121 that bursts when the pressure is generated due to the reverse flow of the exhaust gas to the outside, and the resulting exhaust gas It is to fundamentally prevent the problem caused by reverse flow.

In the above, the Applicant has described preferred embodiments of the present invention, but these embodiments are merely one embodiment for implementing the technical idea of the present invention, and any changes or modifications may be made as long as the technical idea of the present invention is implemented. Should be interpreted as being within the scope.

Claims

A joint reaction body to which a plurality of exhaust pipes for inducing exhaust gas respectively discharged from the plurality of engines are connected;

A separator for separating and separating the inside of the joint reaction body by the number of connected exhaust pipes so that the exhaust gas introduced from each exhaust pipe in the joint reaction body does not mix with the exhaust gas of the other exhaust pipe or flow to the other exhaust pipe;

An SCR catalyst installed separately in each compartment separated by the separator;

It includes a plurality of outlets for discharging the exhaust gas denitrified by the SCR catalyst; to prevent the formation of back pressure through the isolation structure while minimizing the space occupied by bundling the exhaust gas of the plurality of exhaust pipes and jointly denitrification Joint denitrification system for multiple engines characterized by.
The method of claim 1,

Joint denitrification system for a plurality of engines, characterized in that further comprising a non-return valve for preventing the back flow of exhaust gas to the portion of the joint reaction body connected to each exhaust pipe.
The method according to claim 1 or 2,

The separator plate is elongated in the vertical longitudinal direction so as to guide the exhaust gas flowing from each exhaust pipe in the vertical direction, and compartmentally isolates the inside of the joint reaction body, the exhaust pipe can be connected in front, rear, left and right of the joint reaction body. A joint denitrification system for multiple engines, characterized by minimizing the space occupied by the denitrification system.
The method of claim 3, wherein

On each line of the exhaust pipes further comprises a bursting plate which is opened in the event of a backflow of exhaust gas above a certain pressure to prevent backflow of the exhaust gas.