KR20200058966A - Selective catalytic reduction system - Google Patents

Abstract

Embodiments of the present invention relate to a selective catalytic reduction system which can thermally decompose a reducing agent effectively and can selectively reduce nitrogen oxides included in exhaust gas with the reducing agent. The selective catalytic reduction system, which selectively reduces nitrogen oxides included in exhaust gas discharged from an engine, includes: an exhaust receiver storing the exhaust gas discharged from the engine; a supercharging unit installed in the rear of the exhaust receiver and rotated by the exhaust gas discharged from the engine; and a reducing agent supply unit arranged in front of the supercharging unit and supplying a reducing agent to the exhaust gas.

Description

Selective catalytic reduction system {SELECTIVE CATALYTIC REDUCTION SYSTEM}

An embodiment of the present invention relates to a selective catalytic reduction system, and more particularly, to a selective catalytic reduction system capable of selectively reducing nitrogen oxides contained in exhaust gas.

In general, a selective catalytic reduction system selectively reduces nitrogen oxides contained in exhaust gas generated during combustion of an engine. Such a selective catalytic reduction system can be operated according to the navigation area of the vessel is installed.

When the reducing agent supplied to the selective catalytic reduction system is urea, it must be supplied by decomposing with ammonia for its effective reduction of nitrogen oxides.

In this case, a separate configuration such as a heating device for thermally decomposing a reducing agent is added, and there is a problem in that a separate space for installing it on the selective catalytic reduction system must be provided. That is, the configuration of a heat source for thermally decomposing a reducing agent and its installation space are required for a selective catalytic reduction system.

Therefore, as the installation space of the selective catalytic reduction system is increased and a separate configuration is added, there is a problem in that additional facilities for supplying fuel to maintain it are additionally installed.

Embodiments of the present invention provides a selective catalytic reduction system capable of effectively thermally decomposing a reducing agent and selectively reducing nitrogen oxides contained in exhaust gas by receiving it.

According to an embodiment of the present invention, a selective catalytic reduction system for selectively reducing nitrogen oxides contained in exhaust gas discharged from an engine is installed in an exhaust receiver in which exhaust gas discharged from the engine is stored, and behind the exhaust receiver It includes a supercharging part which is rotated by the exhaust gas discharged from the engine, and a reducing agent supply part which is disposed in front of the supercharging part to supply a reducing agent to the exhaust gas.

In addition, the above-described selective catalytic reduction system is installed between the exhaust receiver and the supercharging section, a front flow path guiding the movement of exhaust gas, a rear flow path installed at the rear of the turbocharging section to guide the movement of exhaust gas, and the It is disposed on the rear flow path, and may further include a reactor in which a selective reduction catalyst is installed.

In addition, the reducing agent supply unit may be installed on the front flow path.

Alternatively, the reducing agent supply unit may be installed on one side of the exhaust receiver.

In addition, the selective catalytic reduction system described above may further include a filter member installed on the front flow path in front of the supercharging portion and filtering foreign substances contained in exhaust gas passing through the front flow path.

Alternatively, the selective catalytic reduction system described above may further include a hydrolysis catalyst installed on the front flow path in front of the supercharging portion, and hydrolyzing the reducing agent passing through the front flow path.

Alternatively, the supercharging part of the selective catalytic reduction system described above includes a plurality of superchargers, and is disposed between the reductant and the plurality of superchargers to distribute and supply exhaust gas mixed with a reducing agent to the plurality of superchargers, and It may further include a confluence flow passage disposed between the plurality of superchargers and the reactor to guide the exhaust gas mixed with the reducing agent passing through the plurality of superchargers to be supplied to the reactor.

Alternatively, the supercharging part includes a plurality of superchargers, and the front flow passage is formed in plural between the exhaust receiver and the plurality of superchargers, and is disposed between the plurality of superchargers and the reactor to pass through the plurality of superchargers. It may further include a confluence flow path for guiding the mixed exhaust gas is supplied to the reactor.

Alternatively, the selective catalytic reduction system described above may further include a reductant bypass flow path that guides the movement of exhaust gas by bypassing the reductant supply portion on the front flow path.

In addition, the above-described selective catalytic reduction system bypasses the reactor and guides the reactor to be moved to the front of the reactor by bypassing the reactor, a bypass heating member installed on the reactor bypass channel, and the reactor bypass A blower installed on the flow path may be further included.

In addition, the selective catalytic reduction system described above may further include an exhaust gas heating member that heats the exhaust gas flowing into the reactor.

Alternatively, the selective catalytic reduction system for selectively reducing nitrogen oxides contained in the exhaust gas discharged from the engine includes an exhaust receiver in which the exhaust gas discharged from the engine is stored, and an exhaust receiver installed at the rear of the exhaust receiver and discharged from the engine A supercharging unit including a plurality of superchargers rotated by gas, a reducing agent supply unit for injecting a reducing agent into the exhaust gas that has passed through the exhaust receiver, a rear flow channel installed behind the supercharging unit to guide movement of the exhaust gas, A distribution flow path disposed on the rear flow path, the reactor having a selective reduction catalyst installed therein, and a distribution flow path disposed between the reducing agent supply unit and the plurality of superchargers to distribute and supply exhaust gas mixed with the reducing agent to the plurality of superchargers, And it is disposed between the plurality of superchargers and the reactor, and includes a confluence flow path for guiding the exhaust gas mixed with the reducing agent passing through the plurality of superchargers to be supplied to the reactor.

Alternatively, a selective catalytic reduction system for selectively reducing nitrogen oxides contained in exhaust gas is rotated by an exhaust receiver in which exhaust gas discharged from the engine is stored, and an exhaust gas installed behind the exhaust receiver and discharged from the engine A turbocharger including a plurality of superchargers, a rear flow passage installed at the rear of the supercharger to guide the movement of exhaust gas, a reactor disposed on the rear flow passage and having a selective reduction catalyst installed therein, and the exhaust receiver A first front flow path disposed between any one of the plurality of superchargers and guiding the movement of the exhaust gas passing through the exhaust receiver, and disposed between the exhaust receiver and the other one of the plurality of superchargers to pass through the exhaust receiver A second front flow path guiding the movement of one exhaust gas, a reducing agent supply unit disposed on any one of the first front flow path or the second front flow path to inject a reducing agent to the exhaust gas, and the plurality of turbochargers and the reactor And a confluence flow passage disposed between and guiding the exhaust gas mixed with the reducing agent passing through the plurality of superchargers to be supplied to the reactor.

According to embodiments of the present invention, the selective catalytic reduction system can effectively supply a reducing agent thermally decomposed with the thermal energy of the exhaust gas to remove nitrogen oxides contained in the exhaust gas.

1 shows a selective catalytic reduction system according to a first embodiment of the present invention.
2 shows a selective catalytic reduction system according to a second embodiment of the present invention.
3 shows a selective catalytic reduction system according to a third embodiment of the present invention.
4 shows a selective catalytic reduction system according to a fourth embodiment of the present invention.
5 shows a selective catalytic reduction system according to a fifth embodiment of the present invention.
6 shows a selective catalytic reduction system according to a sixth embodiment of the present invention.
7 shows a selective catalytic reduction system according to a seventh embodiment of the present invention.
8 shows a selective catalytic reduction system according to an eighth embodiment of the present invention.
9 shows a selective catalytic reduction system according to a ninth embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily practice. The present invention can be implemented in many different forms and is not limited to the embodiments described herein.

It is noted that the drawings are schematic and not drawn to scale. The relative dimensions and proportions of the parts in the figures are shown exaggerated or reduced in size for clarity and convenience in the drawings, and any dimensions are merely illustrative and not limiting. And the same reference numerals are used to indicate similar features to the same structural elements or parts appearing in more than one drawing.

The embodiments of the present invention specifically represent ideal embodiments of the present invention. As a result, various variations of the illustration are expected. Therefore, the embodiment is not limited to a specific form of the illustrated area, and includes, for example, modification of the form by manufacturing.

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

The selective catalytic reduction system 101 selectively reduces nitrogen oxides contained in exhaust gas discharged from the engine 10. The selective catalytic reduction system 101 includes an exhaust receiver 100, a supercharging unit 200, and a reducing agent supply unit 300, as shown in FIG.

In the exhaust receiver 100, exhaust gas discharged from the engine 10 is stored. Specifically, the exhaust gas generated according to the combustion of the fuel supplied to the engine 10 passes through the exhaust receiver 100.

The supercharger 200 is installed at the rear of the exhaust receiver 100 and is rotated by exhaust gas discharged from the engine 10. In addition, the turbocharger 200 may be rotated by exhaust gas to supply compressed air necessary for combustion of the engine 10. Specifically, the turbocharger 200 may include a turbine 211 rotated by exhaust gas and a compressor 212 rotated by rotation of the turbine 211 to compress outside air and supplied to the engine 10. .

The reducing agent supply unit 300 is disposed in front of the supercharging unit 200 to supply the reducing agent to exhaust gas. The reducing agent supplied from the reducing agent supply unit 300 may be sprayed to the front of the charging unit 200 to be effectively thermally decomposed by exhaust gas having a relatively higher temperature than the exhaust gas behind the charging unit 200.

Specifically, the reducing agent supply unit 300 may be installed on the exhaust receiver 100 and the supercharging unit 200 to inject the reducing agent into the exhaust gas supplied to the turbine 211 of the supercharging unit 200.

For example, the reducing agent supply unit 300 may include a reducing agent injection line 320 and a pyrolysis chamber 310. The reducing agent supply unit 300 may supply the externally stored reducing agent to the pyrolysis chamber 310. The pyrolysis chamber 310 is installed at a position where the exhaust gas passes in front of the supercharging unit 200 to thermally decompose the reducing agent injected from the reducing agent injection line 320 by the exhaust gas.

When the reducing agent injected from the reducing agent injection line 320 is urea, it may be thermally decomposed with ammonia in the pyrolysis chamber 310 and mixed with exhaust gas.

For example, the temperature of the exhaust gas in front of the turbocharger 200 may be in the range of 280 degrees (° C) to 450 degrees (° C). In addition, the pressure of the exhaust gas in front of the supercharger 200 is 1.1 to 5.0 bar Abs. High pressure can be maintained. That is, the reducing agent supply unit 300 may supply a reducing agent to the exhaust gas having such a temperature range and pressure so that thermal decomposition thereof is achieved. In other words, the environment of the exhaust gas through which the reducing agent supply unit 300 sprays the reducing agent is as described above.

By such a configuration, the selective catalytic reduction system 101 according to the first embodiment of the present invention can supply a reducing agent to the exhaust gas in front of the supercharger 200, so that the thermal energy of the exhaust gas is thermally decomposed by the reducing agent injected. It can be used as required energy.

In addition, the selective catalytic reduction system 101 according to the first embodiment of the present invention may further include a front flow path 400, a rear flow path 600, and a reactor 500.

The front flow path 400 may be installed between the exhaust receiver 100 and the supercharging unit 200 to guide the exhaust gas stored in the exhaust receiver 100 to pass through. Specifically, the front flow path 400 is disposed between the exhaust receiver 100 and the turbine 212 of the supercharging unit 200 to guide the exhaust gas passing through the exhaust receiver 100 to be moved to the turbine 212. Can be. That is, the front flow path 400 may guide a large amount of exhaust gas that has passed through the exhaust receiver 100 to be moved to the turbine 212 of the supercharger 200.

The rear flow path 600 is installed at the rear of the supercharger 200 to guide the movement of the exhaust gas. Specifically, the rear flow path 600 may guide the exhaust gas passing through the turbine 211 of the supercharger 200 to be discharged.

The reactor 500 may have a selective reduction catalyst 510 installed therein. In addition, the exhaust gas mixed with the reducing agent passing through the reactor 500 passes through the selective reduction catalyst 510, and nitrogen oxides contained in the exhaust gas can be decomposed into water (or water vapor) and nitrogen and discharged to the outside. .

That is, the reactor 500 may allow the exhaust gas passing through the rear flow passage 600 to pass through the selective reduction catalyst 510 disposed therein and to selectively reduce nitrogen oxides. Therefore, the exhaust gas mixed with the reducing agent that has passed through the reactor 500 can be discharged to the outside by decomposing nitrogen oxides into water (or water vapor) and nitrogen.

In addition, the reducing agent supply unit 300 of the selective catalytic reduction system 101 according to the first embodiment of the present invention may be installed on the front flow path 400.

The reducing agent supply unit 300 is installed on the front flow path 400, so that the reducing agent can be effectively injected with exhaust gas before being supplied to the turbine 212 of the supercharging unit 200. Specifically, the thermal decomposition chamber 310 of the reducing agent supply unit 300 is installed on the front flow path 400 to thermally decompose the reducing agent injected by the exhaust gas relatively higher than the exhaust gas passing through the supercharging unit 200. have.

In addition, the selective catalytic reduction system 101 according to the first embodiment of the present invention may further include a filter member 810.

The filter member 810 may filter foreign substances contained in exhaust gas supplied to the supercharging unit 200. Specifically, the filter member 810 can effectively prevent the soot or foreign matter contained in the exhaust gas from being moved to the supercharging unit 200.

In addition, the filter member 810 may be installed on the front flow path 400. Specifically, the filter member 810 is installed on the front flow path 400 behind the reducing agent supply unit 300 to filter foreign matter contained in the exhaust gas passing through it.

Then, the filter member 810 is detachably coupled to the front flow path 400, so that the filter member 810 can be selectively replaced by an operator. Accordingly, the operator can replace the filter member 810 from the front flow path 400 based on a certain maintenance cycle or an error according to a decrease in life measured by a separate sensor.

As an example, the filter member 810 is that when the injection amount of the reducing agent is excessively supplied from the reducing agent supply unit 300, it is not possible to effectively decompose it in the thermal decomposition chamber 310 so that the residual solid reducing material or the like is supplied to the supercharging unit 200. It can be effectively prevented.

In addition, the selective catalytic reduction system 101 according to the first embodiment of the present invention may further include a hydrolysis catalyst 830.

The hydrolysis catalyst 830 may be installed in front of the supercharger 200. Further, the hydrolysis catalyst 830 may allow the exhaust gas mixed with the reducing agent to pass through it and hydrolyze.

The hydrolysis catalyst 830 may be installed on the front flow path 400 and detachably coupled to the front flow path 400. That is, the operator can exchange the hydrolysis catalyst 830 by detaching it from the front channel 400.

In addition, when the hydrolysis catalyst 830 serves as the filter member 810 described above at the same time, it can filter foreign substances supplied to the supercharger 200, and further improve the efficiency of reducing agent decomposition.

That is, the selective catalytic reduction system 101 according to the first embodiment of the present invention may include any one or more of the filter member 810 or the hydrolysis catalyst 830.

In addition, the selective catalytic reduction system 101 according to the first embodiment of the present invention may further include a reactor bypass channel 710, a bypass heating member 730, and a blower 720.

The reactor bypass channel 710 may guide a portion of the exhaust gas behind the reactor 500 to be moved to the front of the reactor 500 by bypassing the reactor 500. Specifically, one end of the reactor bypass channel 710 may be connected to the rear channel 600 of the rear of the reactor 500, and the other end of the reactor bypass channel 710 may be connected to the rear channel 600 of the front of the reactor 500. have.

The reactor bypass flow path 710 may guide a portion of the exhaust gas having reduced nitrogen oxide passing through the reactor 500 to be supplied to the front of the reactor 500.

The bypass heating member 730 may be installed on the reactor bypass flow passage 710 to heat the exhaust gas passing through the reactor bypass flow passage 710 to be supplied to the front of the reactor 500.

The blower 720 may be installed on the reactor bypass channel 710. The blower 720 may control the flow of the fluid so that a part of the exhaust gas that has passed through the reactor 500 flows into the reactor bypass channel 710.

Specifically, the bypass heating member 730 and the blower 720 are controlled by a control unit, and may be operated for regeneration of the selective reduction catalyst 510 installed inside the reactor 500. Therefore, the selective catalytic reduction system 101 includes a reactor bypass flow path 710, a bypass heating member 730, and a blower 720, thereby raising and supplying the exhaust gas that has passed through the reactor 500 to supply the reactor 500 ) It is possible to effectively regenerate the selective reduction catalyst 510 installed therein.

Hereinafter, the selective catalytic reduction system 102 according to the second embodiment of the present invention will be described.

As shown in FIG. 2, the selective catalytic reduction system 102 includes an exhaust receiver 100, a reducing agent supply unit 300, and a supercharging unit (100) included in the selective catalytic reduction system 101 according to the first embodiment described above. 200), a reactor 500, a front flow path 400, and a rear flow path 600.

In addition, the selective catalytic reduction system 102 according to the second embodiment of the present invention, as shown in Figure 2, may further include an exhaust gas heating member 740.

The exhaust gas heating member 740 may heat up the exhaust gas flowing into the reactor 500. Specifically, the exhaust gas heating member 740 is operated by the control unit and may supply thermal energy for regeneration of the selective reduction catalyst 510 installed inside the reactor 500. That is, the exhaust gas heating member 740 may heat the rear flow path 600 in front of the reactor 500 so that the exhaust gas passing through it is heated and supplied to the reactor 500.

In addition, the selective catalytic reduction system 102 according to the second embodiment of the present invention may include a filter member 810 or a hydrolysis catalyst () that the selective catalytic reduction system 101 according to the first embodiment described above may include. 830) may be further included.

Hereinafter, the selective catalytic reduction system 103 according to the third embodiment of the present invention will be described with reference to FIG. 3.

The selective catalytic reduction system 103 according to the third embodiment of the present invention includes an exhaust receiver 100, a reducing agent supply unit 300, a supercharging unit 200, and a reactor including the selective catalytic reduction system 101 described above ( 500), the front flow path 400 and the rear flow path 600.

In the selective catalytic reduction system 103 according to the third embodiment of the present invention, as shown in FIG. 3, a reducing agent supply unit 300 may be installed on one side of the exhaust receiver 100.

The reducing agent supply unit 300 is installed on one side of the exhaust receiver 100, so that the reducing agent is thermally decomposed by the high-temperature exhaust gas of the exhaust receiver 100. Specifically, the pyrolysis chamber 310 of the reducing agent supply unit 300 may be installed on one side of the exhaust receiver 100. Therefore, the reducing agent injected into the thermal decomposition chamber 310 is a thermal energy of the exhaust gas stored in the exhaust receiver 100 passes through the thermal decomposition chamber 310 and the thermal energy of the exhaust gas stored in the exhaust receiver 100 Pyrolysis chamber 310 ).

In addition, exhaust gas that has passed through the pyrolysis chamber 310 installed on one side of the exhaust receiver 100 may be supplied to the supercharging unit 200 through the front flow path 400. That is, the front flow path 400 is disposed between the pyrolysis chamber 310 and the turbocharger 200, and guides the exhaust gas passing through the pyrolysis chamber 310 to be supplied to the turbocharger 200.

In addition, the selective catalytic reduction system 103 according to the third embodiment of the present invention may include a filter member 810 or a hydrolysis catalyst () that the selective catalytic reduction system 101 according to the first embodiment described above may include. 830), bypass piping, bypass heating member 730, and may further include a blower (720).

Alternatively, the selective catalytic reduction system 103 according to the third embodiment of the present invention further includes an exhaust gas heating member 740 that may be included in the selective catalytic reduction system 102 according to the second embodiment described above. can do.

Hereinafter, the selective catalytic reduction system 104 according to the fourth embodiment of the present invention will be described with reference to FIG. 4.

The selective catalytic reduction system 104 according to the fourth embodiment of the present invention includes the exhaust receiver 100 and the reducing agent supply unit 300 and the supercharging unit 200 included in the selective catalytic reduction system 101 of the present invention described above. And a reactor 500, a front flow path 400, and a rear flow path 600.

As shown in FIG. 4, the supercharging unit 200 of the selective catalytic reduction system 101 according to the fourth embodiment of the present invention may include a plurality of superchargers 210 and 220.

The plurality of superchargers 210 and 220 may include a plurality of superchargers 210 and 220 including turbines 211 and 221 and compressors 212 and 222. That is, a plurality of superchargers 210 and 220 are installed between the reducing agent supply unit 300 and the reactor 500 so that the exhaust gas passing through each turbine 211 and 221 is supplied to the reactor 500 through the rear flow path 600. can do.

The supercharger 200 may include a first supercharger 210 and a second supercharger 220. The first supercharger 210 may include a first turbine 211 and a first compressor 212. The second supercharger 220 may include a second turbine 221 and a second compressor 222.

In addition, the selective catalytic reduction system 104 according to the fourth embodiment of the present invention may further include a distribution channel 420 and a confluence channel 650.

The distribution flow path 420 may be disposed between the reducing agent supply unit 300 and the plurality of superchargers 210 and 220. In addition, the distribution flow path 420 may guide the exhaust gas in which the reducing agent is mixed to be distributed to the plurality of superchargers 210 and 220.

In addition, one end of the distribution flow path 420 may be connected to the front flow path 400. The other end of the distribution flow path 420 is disposed in the same manner as the number of turbines 211 and 221 included in the plurality of turbochargers 210 and 220, and the exhaust gas passing through the front flow path 400 is transferred to each turbine 211 and 221. You can be guided to supply.

Specifically, the distribution flow path 420 may be connected to the front flow path 400 and the first turbine 211 and the second turbine 221. That is, one end of the distribution channel 420 is connected to the front channel 400, and the other end of the distribution channel 420 is connected to the first turbine 211 and the second turbine 221 to pass through the front channel 400. One exhaust gas may be guided to pass through the first turbine 211 and the second turbine 221 and flow into the rear flow path 600.

Therefore, the exhaust gas passing through the front flow path 400 by the distribution flow path 420 is uniformly distributed to the plurality of superchargers 210 and 220, and surging caused by excessive supply of exhaust gas to one of the plurality of superchargers 210 and 220 (Surging) can be effectively prevented.

The confluence flow path 650 may be disposed between the plurality of superchargers 210 and 220 and the reactor 500. In addition, the confluence flow path 650 may guide the exhaust gas mixed with the reducing agent passing through the plurality of superchargers 210 and 220 to be supplied to the reactor 500.

Specifically, one end of the confluence flow path 650 is disposed equal to the number of turbines 211 and 221 included in the plurality of superchargers 210 and 220, connected to the first turbine 211 and the second turbine 221, and confluence flow path The other end of 650 may be connected to the rear flow path 600. Therefore, it is possible to guide the exhaust gas mixed with the reducing agent passing through the first turbine 211 and the second turbine 221 to be supplied to the reactor 500.

In addition, the selective catalytic reduction system 104 according to the fourth embodiment of the present invention may include a filter member 810 or a hydrolysis catalyst () that the selective catalytic reduction system 101 according to the first embodiment described above may include. 830), bypass piping, bypass heating member 730, and may further include a blower (720).

Alternatively, the selective catalytic reduction system 104 according to the fourth embodiment of the present invention further includes an exhaust gas heating member 740 that can be included in the selective catalytic reduction system 102 according to the second embodiment described above. can do.

Hereinafter, the selective catalytic reduction system 105 according to the fifth embodiment of the present invention. The selective catalytic reduction system 105 according to the fifth embodiment of the present invention includes the exhaust receiver 100 and the reducing agent supply unit 300 included in the selective catalytic reduction system 101 according to the first embodiment of the present invention described above. And a supercharger 200, a reactor 500, a front flow path 400, and a rear flow path 600.

As shown in FIG. 5, the supercharging unit 200 of the selective catalytic reduction system 105 according to the fifth embodiment of the present invention may include a plurality of superchargers 210, 220 and 230.

The plurality of superchargers 210, 220, and 230 may include a plurality of superchargers 210, 220, and 230 including turbines 211, 221, and compressors 212, 222, and 232. That is, a plurality of superchargers 210, 220, and 230 are installed between the reducing agent supply unit 300 and the reactor 500 so that the exhaust gas passing through each turbine 211, 221, 231 is supplied to the reactor 500 through the rear flow path 600. can do.

The supercharger 200 may include a first supercharger 210 and a second supercharger 220. The first supercharger 210 may include a first turbine 211 and a first compressor 212. The second supercharger 220 may include a second turbine 221 and a second compressor 222. The third turbocharger 230 may include a third turbine 231 and a third compressor 232.

In addition, the selective catalytic reduction system 105 according to the fifth embodiment of the present invention may further include a distribution channel 420 and a confluence channel 650.

The distribution flow path 420 may be disposed between the reducing agent supply unit 300 and the plurality of superchargers 210, 220, and 230. In addition, the distribution flow path 420 may guide the exhaust gas in which the reducing agent is mixed to be distributed to the plurality of superchargers 210, 220, and 230.

In addition, one end of the distribution flow path 420 may be connected to the front flow path 400. The other end of the distribution flow path 420 is disposed in the same manner as the number of turbines 211, 221 and 231 included in the plurality of superchargers 210, 220, and 230, and exhaust gas passing through the front flow path 400 to each turbine 211, 221, 231. You can be guided to supply.

Specifically, the distribution flow path 420 may be connected to the front flow path 400, the first turbine 211, the second turbine 221, and the third turbine 231. That is, one end of the distribution flow path 420 is connected to the front flow path 400, and the other end of the distribution flow path 420 is connected to the first turbine 211, the second turbine 221, and the third turbine 231. The exhaust gas passing through the front flow path 400 may be guided to flow into the rear flow path 600 through the first turbine 211, the second turbine 221, and the third turbine 231.

The confluence flow path 650 may be disposed between the plurality of superchargers 210, 220, and 230 and the reactor 500. In addition, the confluence flow path 650 may guide the exhaust gas mixed with the reducing agent that has passed through the plurality of superchargers 210, 220, and 230 to be supplied to the reactor 500.

Specifically, one end of the confluence channel 650 is disposed to be the same as the number of turbines 211, 221 and 231 included in the plurality of superchargers 210, 220, and 230, and thus the first turbine 211, the second turbine 221, and the third turbine ( 231), the other end of the confluence flow path 650 may be connected to the rear flow path 600. Therefore, it is possible to guide the exhaust gas mixed with the reducing agent that has passed through the first turbine 211, the second turbine 221, and the third turbine 231 to be supplied to the reactor 500.

In addition, the selective catalytic reduction system 105 according to the fifth embodiment of the present invention may include a filter member 810 or a hydrolysis catalyst () that the selective catalytic reduction system 101 according to the first embodiment described above may include. 830), bypass piping, bypass heating member 730, and may further include a blower (720).

Alternatively, the selective catalytic reduction system 105 according to the fifth embodiment of the present invention further includes an exhaust gas heating member 740 that can be included in the selective catalytic reduction system 102 according to the second embodiment described above. can do.

Hereinafter, the selective catalytic reduction system 106 according to the sixth embodiment of the present invention will be described.

The selective catalytic reduction system 106 according to the sixth embodiment of the present invention includes the exhaust receiver 100 and the front flow path 400 included in the selective catalytic reduction system 101 according to the first embodiment of the present invention described above. It may include a supercharging part 200, a rear flow path 600, a reducing agent supply part 300, and a reactor 500.

As illustrated in FIG. 6, the supercharging unit 200 of the selective catalytic reduction system 106 according to the sixth embodiment of the present invention includes a plurality of superchargers 210 and 220 and a plurality of front flow paths 400. Can be.

The supercharger 200 may include a plurality of superchargers 210 and 220. In one example, the turbocharger 200 includes a first turbocharger 210 including a first turbine 211 and a first compressor 212 and a second turbine 221 and a second compressor 222 including the second compressor 222. It may include a supercharger 220.

The front flow path 400 may be disposed in plurality between the exhaust receiver 100 and the plurality of superchargers 210 and 220. The number of front flow paths 400 may be the same as the number of the plurality of superchargers 210 and 220. That is, the plurality of front flow paths 400 may supply exhaust gas stored in the exhaust receiver 100 to the plurality of superchargers 210 and 220, respectively. In other words, the plurality of front flow paths 400 may guide the exhaust gas stored in the exhaust receiver 100 to be divided and supplied to the plurality of superchargers 210 and 220.

As an example, the front flow path 400 may include a first front flow path 411 and a second front flow path 412.

That is, one side of the first front flow path 411 may be connected to the exhaust receiver 100, and the other side of the first front flow path 411 may be connected to the first turbine 211.

In addition, one side of the second front flow path 412 may be connected to the exhaust receiver 100, and the other side of the second front flow path 412 may be connected to the second turbine 221.

And the reducing agent supply unit 300 of the selective catalytic reduction system 106 according to the sixth embodiment of the present invention may be installed on either the first front flow path 411 or the second front flow path 412.

That is, the selective catalytic reduction system 106 according to the sixth embodiment of the present invention includes a first front flow path 411 and a second front flow path 412, so that the exhaust receivers ( 100) can supply the exhaust gas stored.

In addition, the selective catalytic reduction system 106 according to the sixth embodiment of the present invention may further include a confluence channel 650.

The confluence flow path 650 is disposed between the plurality of superchargers 210 and 220 and the reactor 500 to guide the exhaust gas mixed with the reducing agent passing through the plurality of superchargers 210 and 220 to the reactor 500. . Specifically, one side of the confluence flow path 650 may be connected to the first turbine 211 and the second turbine 221, respectively, and the other side of the confluence flow path 650 may be connected to the rear flow path 600. Accordingly, the confluence flow path 650 may guide the exhaust gas in which the reducing agent passed through the first turbine 211 and the second turbine 221 is mixed to be supplied to the reactor 500.

In addition, the selective catalytic reduction system 106 according to the sixth embodiment of the present invention may include a filter member 810 or a hydrolysis catalyst (which may be included in the selective catalytic reduction system 101 according to the first embodiment described above) 830), bypass piping, bypass heating member 730, and may further include a blower (720).

Alternatively, the selective catalytic reduction system 106 according to the sixth embodiment of the present invention further includes an exhaust gas heating member 740 that can be included in the selective catalytic reduction system 102 according to the second embodiment described above. can do.

Hereinafter, the selective catalytic reduction system 107 according to the seventh embodiment of the present invention will be described.

The selective catalytic reduction system 107 according to the seventh embodiment of the present invention includes the exhaust receiver 100 and the front flow path 400 included in the selective catalytic reduction system 101 according to the first embodiment of the present invention described above. It may include a supercharging part 200, a rear flow path 600, a reducing agent supply part 300, and a reactor 500.

As shown in FIG. 7, the supercharging part 200 of the selective catalytic reduction system 107 according to the seventh embodiment of the present invention includes a plurality of superchargers 210, 220 and 230 and a plurality of front flow paths 400. Can be.

The supercharger 200 may include a plurality of superchargers 210, 220, and 230. For example, the turbocharger 200 includes a first turbocharger 210 including a first turbine 211 and a first compressor 212, a second turbine 221 and a second compressor 222. A turbocharger 220 and a third turbocharger 230 including a third turbine 231 and a third compressor 232 may be included.

The front flow path 400 may be disposed in plurality between the exhaust receiver 100 and the plurality of superchargers 210, 220, and 230. The number of front flow paths 400 may be the same as the number of the plurality of superchargers 210, 220, and 230. That is, the plurality of front flow paths 400 may supply exhaust gas stored in the exhaust receiver 100 to the plurality of superchargers 210, 220, and 230, respectively. In other words, the plurality of front flow paths 400 may guide the exhaust gas stored in the exhaust receiver 100 to be divided and supplied to the plurality of superchargers 210, 220, and 230.

As an example, the front flow path 400 may include a first front flow path 411, a second front flow path 412, and a third front flow path 413.

That is, one side of the first front flow path 411 may be connected to the exhaust receiver 100, and the other side of the first front flow path 411 may be connected to the first turbine 211. One side of the second front flow path 412 may be connected to the exhaust receiver 100, and the other side of the second front flow path 412 may be connected to the second turbine 221. One side of the third front flow path 413 may be connected to the exhaust receiver 100, and the other side of the third front flow path 413 may be connected to the third turbine 231. Specifically, the first front flow path 411, the second front flow path 412, and the third front flow path 413 may be spaced apart from each other.

And the reducing agent supply unit 300 of the selective catalytic reduction system 107 according to the seventh embodiment of the present invention may be installed on any one of the first front flow path 411 to the third front flow path 413.

That is, the selective catalytic reduction system 107 according to the seventh embodiment of the present invention includes a first front flow path 411, a second front flow path 412, and a third front flow path 413, thereby providing a plurality of superchargers. The exhaust gas stored in the exhaust receiver 100 can be effectively supplied to the (210, 220, 230).

In addition, the selective catalytic reduction system 107 according to the seventh embodiment of the present invention may further include a confluence channel 650.

The confluence flow path 650 is disposed between the plurality of superchargers 210, 220 and 230 and the reactor 500, and guides the exhaust gas mixed with the reducing agent passing through the plurality of superchargers 210, 220 and 230 to be supplied to the reactor 500. . Specifically, one side of the confluence flow path 650 may be connected to the first turbine 211 to the third turbine 231, respectively, and the other side of the confluence flow path 650 may be connected to the rear flow path 600. Accordingly, the confluence flow path 650 may guide the exhaust gas mixed with the reducing agent passing through the first turbine 211 to the third turbine 231 to be supplied to the reactor 500.

In addition, the selective catalytic reduction system 107 according to the seventh embodiment of the present invention may include a filter member 810 or a hydrolysis catalyst () that the selective catalytic reduction system 101 according to the first embodiment described above may include. 830), bypass piping, bypass heating member 730, and may further include a blower (720).

Alternatively, the selective catalytic reduction system 107 according to the seventh embodiment of the present invention further includes an exhaust gas heating member 740 that can be included in the selective catalytic reduction system 102 according to the second embodiment described above. can do.

Hereinafter, the selective catalytic reduction system 108 according to the eighth embodiment of the present invention will be described with reference to FIG. 8.

The selective catalytic reduction system 108 according to the eighth embodiment of the present invention includes the exhaust receiver 100 and the front flow path 400 included in the selective catalytic reduction system 101 according to the first embodiment of the present invention described above. It may include a supercharging part 200, a rear flow path 600, a reducing agent supply part 300, and a reactor 500.

8, the selective catalytic reduction system 108 according to the eighth embodiment of the present invention may further include a reducing agent bypass flow path 660.

The reducing agent bypass channel 660 may guide the exhaust gas that has passed through the exhaust receiver 100 to be supplied to the supercharging unit 200 by bypassing the reducing agent supply unit 300. Specifically, one end of the reducing agent bypass flow passage 660 is connected to the front flow passage 400 between the exhaust receiver 100 and the reducing agent supply part 300, and the other end of the reducing agent bypass flow passage 660 is supercharged with the reducing agent supply part 300 It may be connected to the front flow path 400 between the parts 200.

The exhaust gas passing through the reducing agent bypass flow path 660 may be guided to the supercharger 200 in a state in which the reducing agent is not injected.

In addition, the selective catalytic reduction system 108 according to the eighth embodiment of the present invention may further include a front valve 910, a rear valve 920, a bypass valve 930, and a control unit 900.

The front valve 910 may be disposed on the front flow path 400 between one end of the reducing agent bypass flow path 660 and the pyrolysis chamber 310 of the reducing agent supply part 300. The front valve 910 may control the flow of exhaust gas supplied to the pyrolysis chamber 310.

The rear valve 920 may be disposed on the front flow path 400 between the pyrolysis chamber 310 and the other end of the reducing agent bypass flow path 660. The rear valve 920 may control the flow of exhaust gas through which the exhaust gas that has passed through the pyrolysis chamber 310 is supplied to the supercharger 200.

The bypass valve 930 may be installed on the reducing agent bypass channel 660. The bypass valve 930 may control the flow of exhaust gas passing through the reducing agent bypass channel 660.

The control unit 900 may control opening and closing of the front valve 910, the rear valve 920, and the bypass valve 930. In addition, the control unit 900 may control the reducing agent supply unit 300.

In one example, when a ship equipped with a selective catalytic reduction system 108 is sailing through an exhaust gas emission control area, the control unit 900 opens the front valve 910 and the rear valve 920, and closes the bypass valve 930. , The reducing agent supply unit 300 may be operated. At this time, the reducing agent injected into the thermal decomposition chamber 310 is thermally decomposed and mixed with exhaust gas passing through the front flow path 400 in front of the supercharging unit 200 to be supplied to the supercharging unit 200.

Alternatively, when a ship equipped with a selective catalytic reduction system 108 is sailing through an exhaust gas emission non-regulated area, the control unit 900 closes the front valve 910 and the rear valve 920, and opens the bypass valve 930. , The reducing agent supply unit 300 may stop the operation. At this time, the exhaust gas stored in the exhaust receiver 100 may be supplied to the supercharger 200 by bypassing the reducing agent supply unit 300. That is, the exhaust gas supplied to the turbocharger 200 and the selective catalytic reduction reactor 500 may be supplied without a reducing agent.

In addition, the selective catalytic reduction system 108 according to the eighth embodiment of the present invention may include a filter member 810 or a hydrolysis catalyst () that the selective catalytic reduction system 101 according to the first embodiment described above may include. 830), bypass piping, bypass heating member 730, and may further include a blower (720).

Alternatively, the selective catalytic reduction system 108 according to the eighth embodiment of the present invention further includes an exhaust gas heating member 740 that can be included in the selective catalytic reduction system 102 according to the second embodiment described above. can do.

Hereinafter, the selective catalytic reduction system 109 according to the ninth embodiment of the present invention will be described. The selective catalytic reduction system 109 according to the ninth embodiment of the present invention includes the exhaust receiver 100 and the front flow path 400 included in the selective catalytic reduction system 101 according to the first embodiment of the present invention described above. It may include a supercharging part 200, a rear flow path 600, a reducing agent supply part 300, and a reactor 500.

9, the selective catalytic reduction system 109 according to the ninth embodiment of the present invention may further include a reducing agent bypass flow path 660.

The reducing agent bypass channel 660 may guide the exhaust gas that has passed through the exhaust receiver 100 to be supplied to the supercharging unit 200 by bypassing the reducing agent supply unit 300. Specifically, one end of the reducing agent bypass flow passage 660 is connected to the front flow passage 400 between the exhaust receiver 100 and the reducing agent supply part 300, and the other end of the reducing agent bypass flow passage 660 is supercharged with the reducing agent supply part 300 It may be connected to the front flow path 400 between the parts 200.

The exhaust gas passing through the reducing agent bypass flow path 660 may be guided to the supercharger 200 in a state in which the reducing agent is not injected.

In addition, the selective catalytic reduction system 109 according to the ninth embodiment of the present invention may further include a front valve 910, a three-way valve 940, and a control unit 900, as shown in FIG. have.

The front valve 910 may be disposed on the front flow path 400 between one end of the reducing agent bypass flow path 660 and the pyrolysis chamber 310 of the reducing agent supply part 300. The front valve 910 may control the flow of exhaust gas supplied to the pyrolysis chamber 310.

The three-way valve 940 may be disposed on the other end of the reducing agent bypass flow passage 660 and the front flow passage 400. The three-way valve 940 is a flow of exhaust gas through which the exhaust gas passing through the pyrolysis chamber 310 is supplied to the turbocharger 200 and exhaust gas that has passed through the reducing agent bypass flow passage 660 is supplied to the turbocharger 200. You can control things selectively.

The control unit 900 may control the opening and closing of the front valve 910 and the three-way valve 940 and the operation of the reducing agent supply unit 300.

In one example, when a ship equipped with a selective catalytic reduction system 109 sails through an exhaust gas emission control region, the control unit 900 opens the front valve 910, and the three-way valve 940 opens the pyrolysis chamber 310 and the supercharging unit. It is controlled to communicate with the 200 and close the reducing agent bypass flow passage 660, and operate the reducing agent supply unit 300. At this time, the reducing agent injected into the thermal decomposition chamber 310 is thermally decomposed and mixed with exhaust gas passing through the front flow path 400 in front of the supercharging unit 200 to be supplied to the supercharging unit 200.

Alternatively, when a ship equipped with a selective catalytic reduction system 109 sails through an exhaust gas emission non-regulated area, the control unit 900 closes the front valve 910, and the three-way valve 940 supercharges the pyrolysis chamber 310. The communication between the parts 200 is restricted, the reducing agent bypass flow passage 660 and the supercharging part 200 are controlled to communicate, and the reducing agent supply part 300 can be stopped. At this time, the exhaust gas stored in the exhaust receiver 100 may be supplied to the supercharger 200 by bypassing the reducing agent supply unit 300. That is, the exhaust gas supplied to the turbocharger 200 and the selective catalytic reduction reactor 500 may be supplied without a reducing agent.

In addition, the selective catalytic reduction system 109 according to the ninth embodiment of the present invention may include a filter member 810 or a hydrolysis catalyst () that the selective catalytic reduction system 101 according to the first embodiment described above may include. 830), bypass piping, bypass heating member 730, and may further include a blower (720).

Alternatively, the selective catalytic reduction system 109 according to the ninth embodiment of the present invention further includes an exhaust gas heating member 740 that may be included in the selective catalytic reduction system 102 according to the second embodiment described above. can do.

In addition, the selective catalytic reduction systems (101, 102, 104, 105, 106, 107, 108, 109) according to embodiments of the present invention may further include a turbocharger bypass flow path (850).

The turbocharger bypass flow path 850 may have one end connected to the exhaust receiver 100 and the other end connected to the rear flow path 600 or the confluence flow path 650 behind the turbocharger 200. The supercharger bypass flow passage 850 bypasses the supercharger 200 and supplies a portion of the exhaust gas stored in the exhaust receiver 100 to the reactor 500 to control the temperature of the exhaust gas.

Alternatively, the selective catalytic reduction system 103 according to the third embodiments of the present invention may further include a turbocharger bypass channel 850.

The turbocharger bypass flow passage 850 may have one end connected to the pyrolysis chamber 310 of the reducing agent supply part 300, and the other end connected to the rear flow passage 600 or the confluence flow passage 650 behind the supercharger 200. The turbocharger bypass flow passage 850 is stored in the exhaust receiver 100, and a part of the exhaust gas that has passed through the reducing agent pyrolysis chamber 310 bypasses the supercharger 200 and supplies it to the reactor 500 to control the exhaust gas temperature. Can be adjusted.

Hereinafter, an operation process of the selective catalytic reduction system 101 according to the first embodiment of the present invention will be described with reference to FIG. 1.

When the ship on which the selective catalytic reduction system 101 is installed sails through an exhaust gas emission control area, the control unit 900 operates the reducing agent supply unit 300. In addition, the operation of the bypass heating member 730 and the blower 720 is stopped.

The exhaust gas containing nitrogen oxides generated by combustion of fuel in the engine 10 is stored in the exhaust receiver 100. In addition, the exhaust gas stored in the exhaust receiver 100 may be delivered to the passage supercharging unit 200 through the front flow path 400. At this time, the reducing agent is supplied from the reducing agent supply line 320 to the thermal decomposition chamber 310 installed on the front flow path 400, and the reducing agent may be thermally decomposed by the thermal energy of the exhaust gas passing through the thermal decomposition chamber 310.

The exhaust gas mixed with the thermally decomposed reducing agent may be supplied to the turbine 211 of the supercharger 200 after passing through the filter member 810 or the hydrolysis catalyst 830. The turbine 211 is rotated by the exhaust gas, and the exhaust gas mixed with the reducing agent that has passed through the turbine 211 may flow through the front flow path 400 to the reactor 500.

The exhaust gas flowing into the reactor 500 passes through the selective reduction catalyst 510 installed inside the reactor 500 and is decomposed into water (or water vapor) and nitrogen and can be discharged to the outside. That is, nitrogen oxides contained in the exhaust gas passing through the reactor 500 may be reduced and discharged.

Alternatively, when a ship in which the selective catalytic reduction system 101 is installed sails an exhaust gas emission non-regulated area, the control unit 900 may stop the reducing agent supply unit 300. Accordingly, when the ship sails through the exhaust gas emission non-regulated area, the exhaust gas that has passed through the reactor 500 may still contain nitrogen oxides and be discharged.

In addition, when the ship on which the selective catalytic reduction system 101 is installed sails or anchors an exhaust gas emission non-regulated area, the control unit 900 may operate the bypass heating member 730 and the blower 720.

At this time, the exhaust gas passing through the reactor 500 heated by the bypass heating member 730 toward the front of the reactor 500 may be supplied to the front of the reactor 500. That is, the exhaust gas heated by the flow of the fluid generated by the operation of the blower 720 may be supplied to the front of the reactor 500. Accordingly, the selective reduction catalyst 510 installed inside the reactor 500 can effectively prevent poisoning by sulfuric acid generated by mixing condensate and residual exhaust gas formed according to the low temperature of the reactor 500. That is, the control unit 900 can supply the heated exhaust gas inside the reactor 500, and can effectively prevent poisoning of the selective reduction catalyst 510.

By such a configuration, the selective catalytic reduction systems (101, 102, 103, 104, 105, 106, 107, 108, 109) according to one embodiment of the present invention can thermally decompose the reducing agent by using the thermal energy of high temperature and high pressure exhaust gas passing through the front of the supercharger 200. In addition, when a plurality of superchargers 210, 220, and 230 are included, exhaust gas stored in the exhaust receiver may be uniformly supplied to the plurality of superchargers 210, 220, and 230.

Although the embodiments of the present invention have been described 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 implemented in other specific forms without changing its technical spirit or essential features. will be.

Therefore, the embodiments described above are illustrative in all respects and should be understood as non-limiting, and the scope of the present invention is indicated by the following claims, and the meaning and scope of the claims and It should be construed that all modifications or variations derived from the equivalent concept are included in the scope of the present invention.

10: engine 100: exhaust receiver
200: supercharger 210: first supercharger
220: second supercharger 300: reducing agent supply unit
400: front flow path 500: reactor
510: selective reduction catalyst 600: rear flow path
411: first front flow path 412: second front flow path
420: Distribution Euro 650: Joining Euro
660: reducing agent bypass flow path 710: reactor bypass flow path
720: blower 730: bypass heating element
740: exhaust gas heating member
810: filter member 830: hydrolysis catalyst
101,102,103,104,105,106,107,108,109: selective catalytic reduction system

Claims (13)

In the selective catalytic reduction system for selectively reducing the nitrogen oxide contained in the exhaust gas discharged from the engine,
An exhaust receiver in which exhaust gas discharged from the engine is stored;
A supercharging unit installed at the rear of the exhaust receiver and rotated by exhaust gas discharged from the engine; And
A reducing agent supply unit disposed in front of the supercharging unit to supply a reducing agent to exhaust gas
Selective catalytic reduction system comprising a. In claim 1,
A front flow path installed between the exhaust receiver and the supercharging unit to guide movement of exhaust gas;
A rear flow passage installed at the rear of the supercharging portion to guide movement of exhaust gas; And
A reactor disposed on the rear flow path and having a selective reduction catalyst installed therein
Selective catalytic reduction system further comprising a. In claim 2,
The reducing agent supply unit,
Selective catalytic reduction system, characterized in that installed on the front flow path. In claim 1,
The reducing agent supply unit,
Selective catalytic reduction system, characterized in that installed on one side of the exhaust receiver. In claim 2,
A selective catalytic reduction system further comprising a filter member installed on the front flow path in front of the supercharging part and filtering foreign substances contained in exhaust gas passing through the front flow path. In claim 2,
A selective catalytic reduction system installed on the front flow path in front of the supercharging portion, and further comprising a hydrolysis catalyst to hydrolyze the reducing agent passing through the front flow path. In claim 2,
The supercharger includes a plurality of superchargers,
A distribution flow path disposed between the reducing agent supply unit and the plurality of superchargers and distributing and supplying exhaust gas mixed with the reducing agent to the plurality of superchargers; And
A confluence flow passage disposed between the plurality of superchargers and the reactor and guiding the exhaust gas mixed with the reducing agent passing through the plurality of superchargers to be supplied to the reactor
Selective catalytic reduction system further comprising a. In claim 2,
The supercharger includes a plurality of superchargers,
The front flow path is formed in plurality between the exhaust receiver and the plurality of superchargers,
A confluence flow passage disposed between the plurality of superchargers and the reactor and guiding the exhaust gas mixed with the reducing agent passing through the plurality of superchargers to be supplied to the reactor
Selective catalytic reduction system further comprising a. In claim 3,
A selective catalytic reduction system further comprising a reducing agent bypass channel for guiding the movement of exhaust gas by bypassing the reducing agent supply unit on the front channel. In any one of claims 2 to 9,
A reactor bypass channel for guiding a portion of the exhaust gas behind the reactor to bypass the reactor and move toward the front of the reactor;
A bypass heating member installed on the reactor bypass channel; And
Blower installed on the reactor bypass channel
Selective catalytic reduction system further comprising a. In any one of claims 2 to 9,
Selective catalytic reduction system further comprises an exhaust gas heating member for raising the temperature of the exhaust gas flowing into the reactor. In the selective catalytic reduction system for selectively reducing the nitrogen oxides contained in the exhaust gas discharged from the engine,
An exhaust receiver in which exhaust gas discharged from the engine is stored;
A supercharging unit installed at the rear of the exhaust receiver and including a plurality of superchargers rotated by exhaust gas discharged from the engine;
A reducing agent supply unit for spraying a reducing agent to the exhaust gas that has passed through the exhaust receiver;
A rear flow passage installed at the rear of the supercharging portion to guide movement of exhaust gas;
A reactor disposed on the rear channel and having a selective reduction catalyst 510 installed therein;
A distribution flow path disposed between the reducing agent supply unit and the plurality of superchargers and distributing and supplying exhaust gas mixed with the reducing agent to the plurality of superchargers; And
A confluence flow passage disposed between the plurality of superchargers and the reactor and guiding the exhaust gas mixed with the reducing agent passing through the plurality of superchargers to be supplied to the reactor
Selective catalytic reduction system comprising a. In the selective catalytic reduction system for selectively reducing the nitrogen oxides contained in the exhaust gas discharged from the engine,
An exhaust receiver in which exhaust gas discharged from the engine is stored;
A supercharging unit installed at the rear of the exhaust receiver and including a plurality of superchargers rotated by exhaust gas discharged from the engine;
A rear flow passage installed at the rear of the supercharging portion to guide movement of exhaust gas;
A reactor disposed on the rear channel and having a selective reduction catalyst installed therein;
A first front flow path disposed between any one of the exhaust receiver and the plurality of superchargers to guide movement of exhaust gas passing through the exhaust receiver;
A second front flow path disposed between the exhaust receiver and the other of the plurality of superchargers and guiding movement of exhaust gas passing through the exhaust receiver;
A reducing agent supply unit disposed on one of the first front flow path or the second front flow path to inject a reducing agent into the exhaust gas; And
A confluence flow passage disposed between the plurality of superchargers and the reactor and guiding the exhaust gas mixed with the reducing agent passing through the plurality of superchargers to be supplied to the reactor
Selective catalytic reduction system comprising a.

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