KR102432547B1 - Selective catalytic reuction system - Google Patents

Abstract

The present invention relates to a selective catalytic reduction system, wherein the selective catalytic reduction system according to an embodiment of the present invention is connected to a plurality of power generators, respectively, and exhaust containing nitrogen oxides (NOx) discharged from the plurality of power generators A plurality of exhaust passages for moving gas, a plurality of reactors each provided for each of the plurality of exhaust passages and provided with a catalyst for reducing nitrogen oxide contained in the exhaust gas, and a plurality of each branched from the plurality of exhaust passages a branch pipe, an integrated heating device connected to the plurality of branch pipes to increase a temperature of a portion of the exhaust gas moving along the plurality of branch pipes, and a portion of the exhaust gas heated by the integrated heating device and a plurality of distribution pipes respectively connecting the integrated heating device and the plurality of exhaust passages to join the plurality of exhaust passages in front of the reactor.

Description

Selective catalytic reduction system {SELECTIVE CATALYTIC REUCTION SYSTEM}

The present invention relates to a selective catalytic reduction system for reducing nitrogen oxides contained in exhaust gas using a selective catalytic reduction reaction.

In general, power devices used in ships, etc. include a diesel engine that generates power, a turbocharger that supplies scavenging air to the diesel engine, and a selective catalytic reduction that reduces nitrogen oxides contained in exhaust gas emitted from the diesel engine. (selective catalytic reduction, SCR) systems, and the like.

The selective catalytic reduction system reacts nitrogen oxides and reducing agents contained in the exhaust gas while passing the exhaust gas and the reducing agent together through a reactor in which the catalyst is installed to reduce the nitrogen and water vapor.

When this selective catalytic reduction system is used in ships, its performance and operation are required so that the emission of nitrogen oxides (NOx) emitted from marine diesel engines can satisfy the International Air Pollution Prevention Third Regulation (IMO Tier-III). is becoming

In addition, the selective catalytic reduction system mainly uses a high-temperature active catalyst having an activation temperature within the range of 250 degrees Celsius to 350 degrees Celsius in consideration of economic efficiency and radiation regulation. Here, the activation temperature refers to a temperature at which the catalyst can stably reduce nitrogen oxides without being poisoned.

However, when the catalyst reacts outside the active temperature range, the catalyst is poisoned and the activity of the catalyst is continuously reduced. In particular, when exhaust gas having a relatively low temperature of less than 250 degrees Celsius is introduced into a reactor in which a high-temperature active catalyst is installed, sulfur oxides (SOx) in the exhaust gas and ammonia (NH ₄ ) as a reducing agent react to generate catalyst poisoning substances. do. The catalyst poisoning material may include at least one of ammonium sulfate ((NH4) ₂ SO ₄ ) and ammonium bisulfate (NH ₄ HSO ₄ ).

These catalyst poisoning substances are adsorbed to the catalyst to reduce the activity of the catalyst. Therefore, in order to increase the efficiency of the catalyst and to minimize the loss due to maintenance, it is required to maintain the temperature of the catalyst within the active temperature range.

In addition, the selective catalytic reduction system uses urea or ammonia (NH ₃ ) as a reducing agent for reducing nitrogen oxides.

However, when urea is directly injected into the exhaust gas having a temperature of less than 250 degrees Celsius, biuret, cyanuric acid, melamine, and ammeline, etc. are generated as urea is decomposed. There is a problem in that the nozzle is clogged by by-products or the flow of exhaust gas is obstructed.

Accordingly, when urea is injected into the exhaust gas, it is required to maintain the temperature of the exhaust gas at a temperature suitable for urea to be decomposed.

In addition, in addition to the two-stroke low-speed diesel engine, which is the main power source for propulsion, a four-stroke medium-speed diesel engine used for power generation or as an auxiliary power source is also used for medium-to-large ships. That is, a plurality of engines are often used as power units in ships.

However, there is a problem in that it is not easy or requires a lot of cost to maintain the temperature of each exhaust gas discharged from the plurality of engines at a temperature suitable for decomposition of urea or within an active temperature range so that the catalyst is not poisoned.

An embodiment of the present invention provides a selective catalytic reduction system capable of increasing the temperature of the exhaust gas discharged from each of a plurality of power generating devices or maintaining the exhaust gas flowing into the reactor at a preset temperature.

According to an embodiment of the present invention, the selective catalytic reduction system is connected to a plurality of power generating devices, respectively, a plurality of exhaust passages for moving the exhaust gas containing nitrogen oxides (NOx) discharged from the plurality of power generating devices; a plurality of reactors each installed in each of the plurality of exhaust passages and provided with a catalyst for reducing nitrogen oxides contained in the exhaust gas; a plurality of branch pipes respectively branched from the plurality of exhaust passages; An integrated heating device connected to increase the temperature of a part of the exhaust gas that has moved along the plurality of branch pipes, and a part of the exhaust gas heated by the integrated heating device to the plurality of exhaust passages in front of the plurality of reactors and a plurality of distribution pipes respectively connecting the integrated heating device and the plurality of exhaust passages to merge.

The plurality of branch pipes may be respectively branched from the plurality of exhaust passages in front of the plurality of reactors.

The plurality of power generating devices may include an engine and a supercharger, and each of the plurality of branch pipes may branch a portion of the exhaust gas passing through the supercharger.

In addition, the plurality of power generating devices may include an engine and a supercharger, and the plurality of branch pipes may each branch off a portion of the exhaust gas before passing through the supercharger.

In addition, the plurality of branch pipes may be respectively branched from the plurality of exhaust passages at the rear of the plurality of reactors.

In the selective catalytic reduction system described above, a region of the exhaust passage connected to the distribution pipe may be formed in a hollow cylindrical shape, and an end of the distribution pipe may be connected in an eccentric direction from the center of the exhaust passage.

An end of the distribution pipe may be connected to the exhaust passage in a direction crossing the longitudinal direction of the exhaust passage or may be connected to be inclined in a direction in which the exhaust gas moves along the exhaust passage.

According to an embodiment of the present invention, the selective catalytic reduction system may increase the temperature of the exhaust gas discharged from each of the plurality of power generating devices or maintain the exhaust gas flowing into the reactor at a preset temperature.

1 is a block diagram of a selective catalytic reduction system according to a first embodiment of the present invention.
2 and 3 are cross-sectional views illustrating a state in which the exhaust passage and the distribution pipe of FIG. 1 are connected.
4 is a block diagram of a selective catalytic reduction system according to a second embodiment of the present invention.
5 is a block diagram of a selective catalytic reduction system according to a third embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In addition, in various embodiments, components having the same configuration are typically described in the first embodiment using the same reference numerals, and only configurations different from those of the first embodiment will be described in other embodiments.

It is noted that the drawings are schematic and not drawn to scale. Relative dimensions and proportions of parts in the drawings are shown exaggerated or reduced in size for clarity and convenience in the drawings, and any dimensions are illustrative only and not limiting. And the same reference numerals are used to denote like features for the same structure, element, or part appearing in two or more drawings.

The embodiment of the present invention specifically represents an ideal embodiment of the present invention. As a result, various modifications of the diagram are expected. Accordingly, the embodiment is not limited to a specific shape of the illustrated area, and includes, for example, a shape modification by manufacturing.

Hereinafter, a selective catalytic reduction (SCR) system 101 according to a first embodiment of the present invention will be described with reference to FIG. 1 .

The selective catalytic reduction reaction system 101 according to the first embodiment of the present invention reduces nitrogen oxides (NOx) contained in the exhaust gas discharged from the power generating device.

In addition, the selective catalytic reduction reaction system 101 according to the first embodiment of the present invention is connected to each of a plurality of power generators to reduce nitrogen oxides (NOx) contained in the exhaust gas discharged from the plurality of power generators. can And the plurality of power generating devices may include the diesel engine 200 .

Specifically, in the first embodiment of the present invention, a plurality of power generating devices include a two-stroke low-speed diesel engine 200 used as a main power source for supplying propulsion to a ship or vehicle, and a four-line used for power generation or as an auxiliary power source. It may include one or more of the medium speed diesel engines 200 .

However, the first embodiment of the present invention is not limited thereto. The power generating device may be an internal combustion engine for a plant or an engine for a vehicle. That is, various types of engines known to those of ordinary skill in the art may be used as the power generating device.

Also, the power generating device may further include a supercharger 250 . The supercharger 250 is connected to the exhaust port of the diesel engine 200 to rotate the turbine at the pressure of the exhaust gas of the diesel engine 200 to compress and supply new external air to the diesel engine 200 . Accordingly, the efficiency of the diesel engine 200 equipped with the supercharger 250 is improved. However, the supercharger 250 may be omitted if necessary, and may be installed in various positions as known to those of ordinary skill in the art without being limited to the position shown in FIG. 1 .

In the first embodiment of the present invention, the exhaust gas discharged by the diesel engine 200 has a temperature within the range of 250 degrees Celsius to 500 degrees Celsius, and the temperature of the exhaust gas may be lowered through the supercharger 250 . For example, the exhaust gas passing through the supercharger 250 may have a temperature lowered to 150 degrees Celsius or more and less than 250 degrees Celsius.

As shown in Figure 1, the selective catalytic reduction (SCR) system 101 according to the first embodiment of the present invention is a plurality of exhaust passages 610, a plurality of reactors 300, a plurality of It includes an engine 670 , an integrated heating device 400 , and a plurality of distribution tubes 680 .

In addition, the selective catalytic reduction system 101 according to the first embodiment of the present invention may further include a reducing agent supply unit 500 and a mixing member (550).

The plurality of exhaust passages 610 are respectively connected to the diesel engines 200 of the plurality of power generating devices to move and discharge the exhaust gas containing nitrogen oxides (NOx) discharged from the plurality of diesel engines 200 . Specifically, the plurality of exhaust passages 610 are respectively connected to the exhaust port of the diesel engine 200 to discharge the exhaust gas of the diesel engine 200 .

In addition, when the power generating device includes the supercharger 250 , the exhaust flow path 610 may sequentially connect the diesel engine 200 , the supercharger 250 , and the reactor 300 to be described later. That is, the exhaust gas of the diesel engine 200 moves along the exhaust passage 610 and flows into the reactor 300 .

The plurality of reactors 300 are respectively installed for each of the plurality of exhaust passages 610 . In addition, each of the plurality of reactors 300 includes a catalyst 350 for reducing nitrogen oxides (NOx) contained in exhaust gas discharged from the diesel engine 200 . The catalyst 350 promotes a reaction between nitrogen oxides (NOx) and a reducing agent contained in exhaust gas to reduce nitrogen oxides (NOx) into nitrogen and water vapor.

In addition, in the first embodiment of the present invention, the catalyst 350 installed inside the reactor 300 may be arranged in a multi-layer structure based on the movement direction of the exhaust gas. That is, the catalyst 350 may be provided in the form of a plurality of catalyst modules, and the plurality of catalyst modules may be disposed along the movement direction of the exhaust gas.

The catalyst 350 may be made of various materials known to those skilled in the art, such as zeolite, vanadium, and platinum. For example, the catalyst 350 may have an activation temperature within the range of 250 degrees Celsius to 350 degrees Celsius. Here, the activation temperature refers to a temperature at which the catalyst 350 can stably reduce nitrogen oxides without being poisoned. When the catalyst 350 reacts in an environment outside the active temperature range, the catalyst 350 is poisoned and the efficiency is lowered.

For example, when a reduction reaction to reduce nitrogen oxides contained in exhaust gas occurs at a relatively low temperature of 150 degrees Celsius or more and less than 250 degrees Celsius, sulfur oxides (SOx) and ammonia (NH ₃ ) in the exhaust gas react Thus, a catalyst poisoning substance is produced.

Specifically, the poisoning material for poisoning the catalyst 350 may include at least one of ammonium sulfate ((NH ₄ ) ₂ SO ₄ ) and ammonium bisulfate (NH ₄ HSO ₄ ). This catalyst poisoning material is adsorbed to the catalyst 350 to reduce the activity of the catalyst 350 . Since the catalyst poisoning material is decomposed at a relatively high temperature, that is, at a temperature in the range of 350 degrees Celsius to 450 degrees Celsius, the catalyst 350 in the reactor 300 may be heated to regenerate the poisoned catalyst 350 .

As the reducing agent, ammonia (NH ₃ ) or urea (urea, CO(NH ₂ ) ₂ ) may be used. When urea is used as a reducing agent, urea (urea, CO(NH ₂ ) ₂ ) is hydrolyzed or pyrolyzed to produce ammonia (NH ₃ ) and isocyanic acid (HNCO). And isocyanic acid (HNCO) is again decomposed into ammonia (NH ₃ ) and carbon dioxide (CO ₂ ). In this way, urea is decomposed to finally produce ammonia. And ammonia (NH ₃ ) serves as a final reducing agent that directly reacts with nitrogen oxides. That is, urea (urea, CO(NH ₂ ) ₂ ) and isocyanic acid (HNCO) correspond to the reducing agent precursor.

Also, the housing of the reactor 300 may be made of, for example, stainless steel having excellent heat resistance.

The reducing agent supply unit 500 is installed for each of the plurality of exhaust passages (610). At this time, the reducing agent supply unit 500 is installed on the exhaust passage in front of the reactor (300). In this specification, the front means an upstream direction based on the movement direction of the exhaust gas, and the rear means a downstream direction based on the movement direction of the exhaust gas.

And the reducing agent supply unit 500 injects the reducing agent precursor urea (urea, CO (NH ₂ ) ₂ ) to the exhaust gas moving along the exhaust flow path (610). After the urea supplied by the reducing agent supply unit 500 is injected into the exhaust gas, it is decomposed into ammonia by the thermal energy of the exhaust gas.

The reducing agent supply unit 500 may supply an appropriate amount of urea in consideration of the reducing agent demand varying according to the load of the diesel engine 200 .

In addition, although not shown, the reducing agent supply unit 500 may include various configurations known to those skilled in the art, such as a storage tank, a compressed air supply device for spraying, and the like.

The mixing member 550 may be installed on the exhaust passage 610 between the reducing agent supply unit 500 and the reactor 300 . The mixing member 550 allows the reducing agent or reducing agent precursor injected from the reducing agent supply unit 500 to be effectively mixed with the exhaust gas before flowing into the reactor 300 .

The plurality of branch pipes 670 are respectively branched from the plurality of exhaust passages 610 .

In the first embodiment of the present invention, the plurality of branch pipes 670 are respectively branched from the plurality of exhaust passages 610 in front of the plurality of reactors 300 . And the plurality of branch pipes 670 each branch off a portion of the exhaust gas that has passed through the supercharger 250 .

The integrated heating device 400 is connected to the plurality of branch pipes 670 to increase the temperature of the exhaust gas moved along the plurality of branch pipes 670 .

According to the first embodiment of the present invention, one integrated heating device 400 is connected to a plurality of branch pipes 670 . That is, the exhaust gas each discharged from the diesel engine 200 of the plurality of power generating devices may be heated through one integrated heating device 400 .

In the first embodiment of the present invention, the thermal energy supplied by the integrated heating device 400 is urea (urea, CO(NH ₂ ) ₂ ), which is a reducing agent precursor sprayed by the reducing agent supply unit 500 to the exhaust passage 610 ) Decomposes It can be used to produce ammonia as a reducing agent.

The reducing agent precursor urea (urea, CO(NH ₂ ) ₂ ) is hydrolyzed or pyrolyzed by the thermal energy supplied by the integrated heating device 400 to produce ammonia (NH ₃ ) and isocyanic acid (HNCO). . And isocyanic acid (HNCO) is again decomposed into ammonia (NH ₃ ) and carbon dioxide (CO ₂ ). That is, when urea is decomposed, ammonia may be finally produced.

Meanwhile, in the first embodiment of the present invention, the integrated heating device 400 is not operated when the exhaust gas discharged from the diesel engine 200 of the plurality of power generating devices has a temperature sufficient to decompose urea.

That is, the integrated heating device 400 is operated when the temperature of the exhaust gas discharged from the diesel engine 200 of the plurality of power generating devices is less than an appropriate temperature required to decompose urea and urea (urea, CO (NH ₂ ) ₂ ) It decomposes and supplies the amount of heat required to produce ammonia, a reducing agent.

In addition, according to the first embodiment of the present invention, if necessary, the integrated heating device 400 may be used for regeneration or preheating of the catalyst 350 installed in the reactor 300 .

As such, the integrated heating device 400 may increase the temperature of the exhaust gas discharged from the diesel engine 200 of the plurality of power generating devices, or maintain the exhaust gas flowing into the reactor at a preset temperature. Here, the preset temperature may be a temperature suitable for hydrolysis or thermal decomposition of urea, a reducing agent precursor, or a temperature capable of regenerating the catalyst installed in the reactor 300 .

Specifically, the integrated heating device 400 may include a heating unit 410 and a blowing unit 420 .

When the heating unit 410 is operated, the exhaust gas moving along the branch flow path 670 is heated to increase the temperature. For example, the heating unit 410 may be an oil burner or a plasma burner. That is, in the first embodiment of the present invention, oxygen may be required to operate the heating unit 410 .

The blower 420 may control the flow rate and flow rate of the exhaust gas heated by the heating unit 410 .

In addition, although not shown, when oxygen is required for operation of the heating unit 410 , the outdoor air supply unit may supply oxygen. In this case, the outdoor air supply unit may supply air sufficient to supply oxygen necessary for the heating unit 410 to burn fuel. The outdoor air supply unit may include an outdoor air supply passage for injecting external air, an outdoor air supply valve for opening and closing the outdoor air supply passage, or an outdoor air supply pump.

The plurality of distribution pipes 680 respectively connect the integrated heating device 400 and the plurality of exhaust flow paths 610 such that the exhaust gas heated by the integrated heating device 400 rejoins the plurality of exhaust flow paths 610 . . At this time, the plurality of distribution pipes 680 are respectively connected to the plurality of exhaust passages 610 in front of the plurality of reactors 300 . As such, the exhaust gas heated by the integrated heating device 400 is mixed with the exhaust gas flowing through the exhaust passage 610 to increase the overall temperature of the exhaust gas directed to the reactor.

And according to the first embodiment of the present invention, as shown in FIG. 2 , a region of the exhaust passage 610 connected to the distribution pipe 680 is formed in a hollow cylindrical shape, and the end of the distribution pipe 680 is It is connected in an eccentric direction from the center of the exhaust passage 610 .

Accordingly, the heated exhaust gas introduced into the exhaust passage 610 through the distribution pipe 680 forms a swirling flow in the exhaust passage 610 and is effectively mixed with the existing exhaust gas flowing through the exhaust passage 610 .

That is, according to the first embodiment of the present invention, the distribution pipe 680 may improve the mixing efficiency of the exhaust gas together with the above-described mixing member 550 .

In addition, the end of the distribution pipe 680 may be connected to the exhaust passage 610 in a direction crossing the longitudinal direction of the exhaust passage 610 or may be connected to be inclined in a direction in which the exhaust gas moves along the exhaust passage 610 . In this case, the angle θ at which the end of the distribution pipe 680 is inclinedly connected to the exhaust passage 610 may have an angle within the range of 0 degrees to 60 degrees.

Accordingly, the exhaust gas heated through the integrated heating device 400 may be effectively mixed with the exhaust gas moving along the exhaust flow path 610 .

By this configuration, the selective catalytic reduction system 101 according to the first embodiment of the present invention raises the temperature of the exhaust gas discharged from each of the plurality of power generating devices or the exhaust gas flowing into the reactor 300 It can be maintained at a preset temperature. Here, the preset temperature may be a temperature suitable for hydrolysis or thermal decomposition of urea, a reducing agent precursor, or a temperature capable of regenerating the catalyst 350 installed in the reactor 300 .

Specifically, by using the integrated heating device 400 to simultaneously increase the temperature of the exhaust gas discharged from a plurality of power generating devices or to maintain the exhaust gas flowing into the reactor 300 at a preset temperature, the reducing agent supplied from the supply unit It is possible to stably decompose urea, a reducing agent precursor, to produce ammonia, which is a reducing agent.

In addition, according to the first embodiment of the present invention, since the integrated heating device 400 is used, the overall installation and maintenance cost of the selective catalytic reduction system 101 is reduced and effective operation is possible.

In addition, since the end of the distribution pipe 680 is eccentrically connected to the exhaust flow path 610 and the heated exhaust gas introduced into the exhaust flow path 610 from the distribution pipe 680 generates a swirling flow, the reducing agent supply unit 500 It is possible to improve the mixing efficiency of the reducing agent supplied from the exhaust gas.

Hereinafter, a selective catalytic reduction reaction system 102 according to a second embodiment of the present invention will be described with reference to FIG.

4, in the selective catalytic reduction system 102 according to the second embodiment of the present invention, a plurality of branch pipes 670 are respectively branched from a plurality of exhaust passages 610, in which case a plurality of branch pipes 670 each branch off a portion of the exhaust gas before passing through the supercharger 250 .

That is, the selective catalytic reduction system 102 according to the second embodiment of the present invention is the same as the first embodiment except for the point at which the plurality of branch pipes 670 branch from the plurality of exhaust passages 610, respectively.

By this configuration, the selective catalytic reduction system 102 according to the second embodiment of the present invention also raises the temperature of the exhaust gas discharged from each of the plurality of power generating devices or reduces the exhaust gas flowing into the reactor 300 . It can be maintained at a preset temperature.

In particular, according to the second embodiment of the present invention, since a part of the exhaust gas before passing through the supercharger 250 is branched, the exhaust gas moving along the plurality of branch pipes 670 is relatively compared to the first embodiment. have a high temperature.

Therefore, according to the second embodiment of the present invention, the operation of the integrated heating device 400 can be relatively minimized compared to the first embodiment. That is, it is possible to reduce additional fuel consumption according to the operation of the integrated heating device 400 .

Hereinafter, a selective catalytic reduction reaction system 103 according to a third embodiment of the present invention will be described with reference to FIG. 5 .

As shown in Figure 5, in the selective catalytic reduction system 103 according to the third embodiment of the present invention, the plurality of branch pipes 670 are from the plurality of exhaust passages 610 in the rear of the plurality of reactors (300). each branched

That is, the selective catalytic reduction system 103 according to the third embodiment of the present invention is the same as the first embodiment except for the point at which the plurality of branch pipes 670 branch from the plurality of exhaust passages 610, respectively.

By such a configuration, the selective catalytic reduction system 103 according to the third embodiment of the present invention also raises the temperature of the exhaust gas discharged from each of the plurality of power generating devices or reduces the exhaust gas flowing into the reactor to a preset temperature. can be maintained as

In particular, according to the third embodiment of the present invention, since a part of the exhaust gas that has passed through the reactor 300 is branched, thermal energy of the exhaust gas that has passed through the reactor 300 can be recovered. That is, in the third embodiment, waste heat can be recovered and recycled.

Therefore, according to the third embodiment of the present invention, compared to the first embodiment, it is possible to minimize wasted thermal energy.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential features thereof. will be.

Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims, the meaning and scope of the claims, and All changes or modifications derived from the equivalent concept should be construed as being included in the scope of the present invention.

101: selective catalytic reduction system
200: diesel engine
250: supercharger
300: reactor
350: catalyst
400: integrated heating device
410: heating unit
420: blower
500: reducing agent supply unit
550: mixing member
610: exhaust flow path
670: branch pipe
680: distribution pipe

Claims (7)

a plurality of exhaust passages respectively connected to a plurality of power generators to move exhaust gas containing nitrogen oxides (NOx) discharged from the plurality of power generators;
a plurality of reactors installed in each of the plurality of exhaust passages and provided with a catalyst for reducing nitrogen oxides contained in the exhaust gas;
a plurality of branch pipes each branched from the plurality of exhaust passages;
an integrated heating device connected to the plurality of branch pipes to increase the temperature of a portion of the exhaust gas that has moved along the plurality of branch pipes; and
A plurality of distribution pipes respectively connecting the integrated heating device and the plurality of exhaust passages so that a part of the exhaust gas heated by the integrated heating apparatus joins the plurality of exhaust passages in front of the plurality of reactors
A selective catalytic reduction system comprising a. According to claim 1,
The plurality of branch pipes are selectively catalytic reduction system, characterized in that each branched from the plurality of exhaust passages in front of the plurality of reactors. 3. The method of claim 2,
The plurality of power generating devices include an engine and a supercharger,
Selective catalytic reduction system, characterized in that the plurality of branch pipes branch a portion of the exhaust gas that has passed through the supercharger, respectively. 3. The method of claim 2,
The plurality of power generating devices include an engine and a supercharger,
Selective catalytic reduction system, characterized in that each of the plurality of branch pipes branch off a portion of the exhaust gas before passing through the supercharger. According to claim 1,
The plurality of branch pipes are selectively catalytic reduction system, characterized in that each branched from the plurality of exhaust passages behind the plurality of reactors. 6. The method according to any one of claims 1 to 5,
One region of the exhaust passage connected to the distribution pipe is formed in a hollow cylindrical shape,
The end of the distribution pipe is a selective catalytic reduction system, characterized in that connected in an eccentric direction from the center of the exhaust passage. 7. The method of claim 6,
The end of the distribution pipe is connected to the exhaust passage in a direction crossing the longitudinal direction of the exhaust passage or is connected to the exhaust gas along the exhaust passage to be inclined in a direction in which the exhaust gas moves. Selective catalytic reduction system.

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