KR20210067455A - Selective catalytic reduction system - Google Patents

Abstract

The present invention relates to a selective catalytic reduction system. According to an embodiment of the present invention, the selective catalytic reduction system includes: a first support; a second support that is detachably coupled to the top, bottom, or side of the first support to form a multi-stage structure; a reactor unit that is supported by the first support and reacts nitrogen oxides contained in exhaust gas with a reducing agent to reduce nitrogen oxides; and a reducing agent supply unit that is supported by the second support to be detachably connected to the reactor unit, and decomposes the reducing agent to supply the reducing agent to the reactor unit.

Description

Selective Catalytic Reduction System {SELECTIVE CATALYTIC REDUCTION SYSTEM}

The present invention relates to a selective catalytic reduction system, and more particularly, to a selective catalytic reduction reactor for reducing nitrogen oxides (NOx) contained in exhaust gas through a selective catalytic reduction reaction.

As industrialization progresses rapidly, the use of various fossil fuels such as petroleum and coal has increased. As a result, various harmful gases emitted during the combustion of fossil fuels cause serious air pollution. Typical examples include smog and acid rain.

The main culprits of air pollution include sulfur oxides (SOx) and nitrogen oxides (NOx) in exhaust gases emitted from engines of vehicles and ships, thermal power plants, factories, and the like.

In recent years, with the increasing awareness of environmental conservation, emission regulations for these sulfur oxides and nitrogen oxides have been introduced.

In particular, there is a selective catalytic reduction (SCR) system as a representative facility for reducing nitrogen oxides. 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, the emission of nitrogen oxides (NOx) emitted from marine diesel engines is the 3rd International Air Pollution Prevention Regulation (IMO Tier-III) regulated by the International Maritime Organization. Therefore, an effective operation method along with a low-cost and high-efficiency denitrification facility is required.

On the other hand, due to the limited space of the ship, the selective catalytic reduction system used in the ship is required to simplify.

However, in the conventional selective reduction system, a burner, a blower, a decomposition chamber, a urea supply device, etc. are each independently installed separately from a reactor equipped with a catalyst, making efficient space utilization more difficult.

In addition, the conventional selective reduction system further includes a reducing agent injection unit for injecting a reducing agent into the exhaust gas discharged from the engine and moving to the reactor along the exhaust flow path, and a mixer (mixer) for mixing the injected reducing agent with the exhaust gas, etc. have. And since the reducing agent injected through the reducing agent injection unit must be sufficiently mixed with the exhaust gas, a residence time is required for mixing with the exhaust gas from the point where the reducing agent is injected before reaching the reactor where the catalyst is installed. And in order to secure such a residence time, the exhaust passage from the point where the reducing agent is injected to the reactor is required to have a minimum length. Thus, forming the length of the exhaust passage to be long greatly reduces the ease of installation according to the spatial limitation when the selective catalytic reduction system is installed in a ship.

In addition, when the selective catalytic reduction system is not in operation, the exhaust gas should be separately installed as a bypass flow path for bypassing and moving the catalyst installed reactor.

As described above, as the overall configuration of the selective reduction system becomes complicated, there is a problem in that it is not easy to optimally install the selective catalytic reduction system to maximize the efficiency of the selective catalytic reduction system in a limited space such as a ship. In addition, there is a problem that maintenance becomes difficult by installing a selective catalytic reduction system having a complicated structure in a narrow space.

An embodiment of the present invention provides a selective catalytic reduction system that improves the ease of installation and maintenance by uniting various components by use while simplifying the configuration.

According to an embodiment of the present invention, the selective catalytic reduction system is a first support and a second support that is detachably coupled to the upper, lower, or side of the first support to form a multi-stage structure, and to the first support A reactor unit that is supported and reacts nitrogen oxides contained in the exhaust gas with a reducing agent to reduce nitrogen oxides, and is supported on the second support and is separably connected to the reactor unit, and decomposes and generates a reducing agent and supplies it to the reactor unit and a reducing agent supply unit.

The reducing agent supply unit may be separable from the reactor unit supported on the first support together with the second support.

The reactor unit includes a main body having a main body outlet formed at one end and an opening at the other side thereof, and integrally coupled to the other side of the main body having the opening to communicate with the interior of the main body through the opening at one end. A bypass portion having an inlet and a bypass outlet formed at the other end thereof, and a catalyst disposed between the opening and the main body outlet in the reactor body.

The reactor unit is installed inside the bypass unit adjacent to the opening of the main body, and a guide vane for diffusing and moving the exhaust gas so that the exhaust gas flowing into the interior of the main body through the opening evenly contacts the catalyst. ) may be further included.

The reactor unit may further include a reducing agent injection unit coupled to the inlet for spraying the reducing agent supplied from the reducing agent supply unit. In addition, the reducing agent injected from the reducing agent injection unit may be mixed with the exhaust gas inside the bypass unit and then introduced into the reactor body through the opening.

When the reducing agent injection unit injects the reducing agent, the exhaust gas introduced into the bypass unit through the inlet may be discharged to the main body outlet through the catalyst after moving to the reactor body through the opening. And when the reducing agent injection unit does not inject the reducing agent, the exhaust gas introduced into the bypass unit through the inlet may be discharged to the bypass outlet.

The reducing agent supply unit includes a recirculation flow path having both ends separably connected to the rear end of the main body of the reactor unit and the reducing agent injection unit, a flow meter installed on the recirculation flow path, a blower installed on the recirculation flow path, and the recirculation It may include a burner installed on the flow passage, a decomposition chamber installed on the recirculation passage, and a urea supply unit for supplying urea to the decomposition chamber.

And the flowmeter is installed furthest from the reactor unit, the decomposition chamber is disposed between the flowmeter and the reactor unit, the blower blows the exhaust gas passing through the flowmeter in the direction of the reactor unit, and the blower The blown exhaust gas may be heated by the burner to move toward the decomposition chamber, and the urea supply unit may be disposed adjacent to the decomposition chamber.

In addition, the reducing agent supply unit includes a recirculation passage connecting the rear end of the main body of the reactor unit and the reducing agent injection unit, a flow meter installed on the recirculation passage, a hot air fan installed on the recirculation passage, and decomposition installed on the recirculation passage It may include a chamber, and a urea supply unit for supplying urea to the decomposition chamber.

According to an embodiment of the present invention, the selective catalytic reduction system can improve the ease of installation and maintenance by uniting various components for each purpose while simplifying the configuration.

1 is a perspective view showing a selective catalytic reduction system according to a first embodiment of the present invention.
Figure 2 is a plan view showing the internal structure of the reactor unit of the selective catalytic reduction system of Figure 1;
Figure 3 is a front view showing the reducing agent supply unit used in the selective catalytic reduction system according to the second embodiment of the present invention.
4 is a front view showing a hot air blower and a decomposition chamber used in the selective catalytic reduction system according to the 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 in other embodiments, only configurations different from those of the first embodiment will be described. .

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. In addition, the same reference numerals are used to indicate like features to 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 system 101 according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2 .

The selective catalytic reduction system 101 according to the first embodiment of the present invention is used to reduce nitrogen oxides (NOx) contained in the exhaust gas discharged from the power unit. For example, the power unit may be a diesel engine used as a main power source for supplying propulsion to a ship. Also, the diesel engine may be a two-stroke low-speed diesel engine for marine use.

However, the first embodiment of the present invention is not limited to the above. The power unit 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 device.

The exhaust gas containing nitrogen oxides (NOx) discharged from the power unit moves through the exhaust passage. That is, the exhaust passage is connected to the exhaust port of the diesel engine, which is a power device, to discharge the exhaust gas of the diesel engine and may be connected to the selective catalytic reduction system 101 .

1 and 2, the selective catalytic reduction system 101 according to the first embodiment of the present invention is a first support 210, a second support 220, a reactor unit 301, and a reducing agent a supply unit 401 .

The first support 210 accommodates and supports the reactor unit 301 to be described later. That is, the first support 210 and the reactor unit 301 may be combined and formed integrally.

The second support 220 is detachably coupled to the upper, lower, or side of the first support 210 to receive and support the reducing agent supply unit 401 to be described later. That is, the second support 220 and the reducing agent supply unit 401 may be combined and formed integrally.

That is, after installing the reactor unit 301 on the first support 210 , and installing the reducing agent supply unit 401 on the second support 220 , the second support 220 is attached to the first support 210 . In this way, the selective catalytic reduction system 101 can be completed. Here, the first supporter 210 and the second supporter 220 may include a main frame and a sub-frame coupled to the main frame to support the respective components, respectively.

In Figure 1, for convenience of explanation, a portion of the first support 210 and the second support 220 is expressed as a dotted line so that the reactor unit 301 and the reducing agent supply unit 401 are exposed.

The reactor unit 301 is supported on the first support 210 and reacts nitrogen oxides contained in the exhaust gas with a reducing agent to reduce nitrogen oxides. Specifically, the reactor unit 301 may include a body part 310 , a bypass part 340 , a catalyst 350 , a guide vane 343 , and a reducing agent injection part 360 .

The main body 310 has a main body outlet 319 formed at one end and an opening 314 is formed at the other side thereof. And the main body 310 may be formed in various types of container shapes.

The bypass part 340 is integrally coupled to the other side of the body part 310 in which the opening 314 is formed and communicates with the interior of the body part 310 through the opening 314 . In addition, an inlet 341 is formed at one end of the bypass unit 340 and a bypass outlet 349 is formed at the other end.

The inlet 341 , the main body outlet 319 , and the bypass outlet 349 are respectively connected to an exhaust flow path (not shown). That is, the exhaust gas discharged from the engine moves along the exhaust passage and flows into the selective catalytic reduction system 101 through the inlet 341 , and then is discharged through the main body outlet 319 or the bypass outlet 349 .

The catalyst 350 is disposed in the interior of the body portion 310 between the opening 314 and the body outlet 319 . The catalyst 350 may be disposed in the form of a module, and a plurality of catalyst modules may be loaded in a direction crossing the movement direction of the exhaust gas inside the body part 300 to form a plurality of catalyst layers. The plurality of catalyst layers may be arranged to be spaced apart from each other based on the direction in which the exhaust gas moves within the main body 310 .

In addition, the plurality of catalyst modules may be formed in a hexahedron. For example, the plurality of catalyst modules may be a cuboid or a cube. When the catalyst module is formed as a cuboid or cube as described above, it is easy to load the catalyst module, as well as easy replacement and transport of the catalyst module, and the efficiency of the catalyst 350 included in the catalyst module can be maximized.

In addition, 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 200 degrees Celsius to 500 degrees Celsius. Here, the activation temperature refers to a temperature at which the catalyst 350 can stably reduce nitrogen oxides without being poisoned. If the catalyst 350 reacts 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) of exhaust gas and ammonia (NH ₃ ) as a reducing agent reacts to form a catalyst poisoning substance. 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 within the range of 350 degrees Celsius to 450 degrees Celsius, the catalyst 350 in the reactor may be heated to regenerate the poisoned catalyst 350 .

_{In addition, ammonia (NH 3} ) is used as a reducing agent that directly reacts with nitrogen oxides in the catalyst 350, but it is common to use a stable aqueous urea solution because ammonia itself is not easy to store and transport as a contaminant. That is, urea, which is a reducing agent precursor, is stored, transported, and supplied in the form of an aqueous solution. Urea (urea, CO(NH ₂ ) ₂ ) aqueous solution 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 ).} That is, urea is decomposed in the decomposition chamber 450 of the reducing agent supply unit 401 to be described later to generate ammonia, which is a reducing agent that reacts with nitrogen oxides.

The guide vane 343 is installed inside the bypass unit 340 adjacent to the opening 314 of the main body 310 and exhaust gas flowing into the main body 310 through the opening 314 . The exhaust gas may be diffusely moved so that the gas is in contact with the catalyst 350 evenly. To this end, a plurality of guide vanes 343 may be set at various angles. That is, the exhaust gas flowing into the body part 310 through the opening 314 is diffused by the guide vanes 343 to evenly contact the catalyst 350 installed inside the body part 310 .

The reducing agent injection unit 360 is coupled to the inlet 341 to inject the reducing agent supplied from the reducing agent supply unit 401 to be described later. And the reducing agent injected from the reducing agent injection unit 360 is mixed with the exhaust gas inside the bypass unit 340 and then introduced into the body unit 310 through the opening 314 .

As such, in the first embodiment of the present invention, the reducing agent may be mixed with the exhaust gas in the bypass portion 340 integrally formed with the body portion 310 . That is, the bypass unit 340 may perform two roles of moving the exhaust gas without going through the catalyst 350 or mixing the reducing agent with the exhaust gas.

In the first embodiment of the present invention, when the reducing agent injection unit 360 injects the reducing agent, the exhaust gas introduced into the bypass unit 340 through the inlet 341 is the reducing agent injection unit in the bypass unit 340 . 360 is mixed with the sprayed reducing agent, and then moves to the main body 310 through the opening 314 and then is discharged to the main body outlet 319 through the catalyst 350 .

And, when the reducing agent injection unit 360 does not inject the reducing agent, the exhaust gas introduced into the bypass unit 340 through the inlet 341 is discharged directly to the bypass outlet 349 without going through the catalyst 350 . do. At this time, the reducing agent injection unit 360 does not spray the reducing agent.

As such, the bypass unit 340 integrally formed with the main body 310 becomes a space for mixing the exhaust gas and the reducing agent when the reducing agent is injected from the reducing agent injection unit 360, and when the reducing agent is not injected, the catalyst ( 350) to bypass the exhaust gas.

Meanwhile, although not shown, the flow of exhaust gas includes a main valve installed in the main exhaust pipe connecting the body outlet 319 and the exhaust flow path, and a bypass valve installed in the bypass outlet pipe connecting the bypass outlet 349 and the exhaust flow path. can be switched by opening and closing the For example, when the main valve is opened and the bypass valve is closed, the exhaust gas flowing into the bypass unit 340 through the inlet 341 moves to the body unit 310 through the opening 314 and then the catalyst 350 ) through the main body outlet 319 is discharged. And when the main valve is closed and the bypass valve is opened, the exhaust gas flowing into the bypass unit 340 through the inlet 341 is directly discharged to the bypass outlet 349 without passing through the catalyst 350 .

The reducing agent supply unit 401 decomposes the reducing agent and supplies it to the reducing agent injection unit 460 of the reactor unit 301 . And the reducing agent supply unit 401 is supported on the second support 220 and is detachably connected to the reactor unit 301 .

Specifically, the reducing agent supply unit 401 may include a recirculation flow path 480 , a flow meter 410 , a blower 420 , a burner 440 , a decomposition chamber 450 , and a urea supply unit 460 .

Both ends of the recirculation flow path 480 are detachably connected to the rear end of the main body 410 of the reactor unit 301 and the reducing agent injection unit 360, respectively. The exhaust gas is moved from the rear end of the main body 310 of the reactor unit 301 in the direction of the reducing agent injection unit 360 along the recirculation passage 480 by the blower 420 to be described later.

In addition, when the first support 210 and the second support 220 are separated, both ends of the recirculation passage 480 are separated from the rear end of the main body 310 of the reactor unit 301 and the reducing agent injection part 360 . Thereby, the reducing agent supply unit 401 and the reactor unit 301 can also be separated.

The blower 420 is installed on the recirculation flow path 480 to suck the exhaust gas from the rear end of the main body 310 of the reactor unit 301 to provide power to move the exhaust gas in the direction of the reducing agent injection unit 360. .

The burner 440 may increase the temperature of the exhaust gas moving along the recirculation passage 480 . For example, the burner 440 may be an oil burner or a plasma burner.

The decomposition chamber 450 is installed on the recirculation passage 480 to thermally decompose or hydrolyze urea with thermal energy of the exhaust gas heated by the burner 440 to generate ammonia as a reducing agent.

The urea supply unit 460 supplies urea to the decomposition chamber 450 . At this time, urea may be supplied in the form of an aqueous solution.

The flow meter 410 measures the flow rate of the exhaust gas moving along the recirculation flow path 480 . The total heat flow rate supplied to the decomposition chamber 450 may be calculated based on the flow rate of the exhaust gas measured by the flow meter 410 and the temperature of the exhaust gas heated by the burner 440 . That is, it can be determined whether the thermal energy required for decomposition of the reducing agent is sufficiently supplied to the decomposition chamber 450 . When the load of the engine is changed or the type of fuel supplied to the engine is changed, the concentration of nitrogen oxides contained in the exhaust gas is also changed, so the amount of urea supplied by the urea supply unit 460 is also changed. Therefore, since the total thermal energy required for decomposition of urea also varies, it is necessary to determine whether an appropriate flow rate of exhaust gas is supplied to the decomposition chamber 450 through the flow meter 410 . In addition, the flow rate of the fluid supplied to the reducing agent injection unit 360 through the flow rate of the exhaust gas measured by the flow meter 410 can also be grasped.

As described above, the reducing agent supply unit 401 may be coupled to be detachably installed from the reactor unit 301 supported on the first support 210 together with the second support 220 .

By such a configuration, the selective catalytic reduction system 101 according to the first embodiment of the present invention can improve the easiness of installation and maintenance by uniting various configurations for each purpose while simplifying the configuration.

Specifically, the selective catalytic reduction system 101 according to the first embodiment of the present invention is installed in such a way that the reactor unit 301 is installed in the installation space and each component of the reducing agent supply unit 401 is separately installed. Rather, the reactor unit 301 in the space where the reactor unit 301 and the reducing agent supply unit 401 are installed on the first support 210 and the second support 220, respectively, and the selective catalytic reduction system 101 is installed. It may be installed in such a way as to couple the second support 220 for supporting the reducing agent supply unit 401 to the first support 210 for supporting the.

In addition, according to the first embodiment of the present invention, the overall configuration of the selective catalytic reduction system 101 can be simplified by using the bypass unit 340 of the reactor unit 301 as a space for mixing the reducing agent and the exhaust gas. have.

In addition, the exhaust gas introduced into the inlet 341 connected to one end of the bypass unit 340 moves in the direction of the other end inside the bypass unit 340 and then passes through the guide vane 343 and the opening 314 . It is introduced into the interior of the main body 310 via As such, since the movement direction is switched when the exhaust gas moves from the bypass unit 340 to the body unit 310 , the exhaust gas and the reducing agent can be mixed more effectively. Accordingly, a mixer for mixing the exhaust gas and the reducing agent may be omitted.

In addition, according to the first embodiment of the present invention, the reducing agent injection unit 360 and the bypass unit 340 needlessly in order to secure a residence time for the reducing agent injected from the reducing agent injection unit 360 to be mixed with the exhaust gas. There is no need to shape the exhaust passage between the long, and the reducing agent injection unit 360 may be installed in a position close to the bypass unit 340 formed integrally with the main body 310. Installation of the reducing agent injection unit 360 freedom increases. Therefore, the position of the reducing agent injection unit 360 can be freely set according to the size and shape of the space in which the selective catalytic reduction system 101 is to be installed.

Hereinafter, a selective catalytic reduction system 102 according to a second embodiment of the present invention will be described with reference to FIG. 3 . 3 shows only the reducing agent supply unit 402 of the selective catalytic reduction system 102, and the reactor unit 301 is the same as in the first embodiment.

As shown in FIG. 3, in the selective catalytic reduction system 102 according to the second embodiment of the present invention, exhaust gas moving along the recirculation flow path 480 by optimizing the arrangement of each component of the reducing agent supply unit 402 flow can be smoothed and operational efficiency can be improved.

Specifically, in the second embodiment of the present invention, the flow meter 410 is installed furthest from the reactor unit 301 , and the decomposition chamber 450 is disposed between the flow meter and the reactor unit 301 .

In addition, the blower 420 blows the exhaust gas that has passed through the flow meter 410 in the reactor unit 301 direction, and the exhaust gas blown by the blower 420 is heated by the burner 440 to the decomposition chamber 450 direction. will move to And the exhaust gas discharged from the decomposition chamber 450 is moved to the reducing agent injection unit 360 (shown in FIG. 1) of the reactor unit 301 together with the reducing agent.

According to the arrangement as described above, in the selective catalytic reduction system 102 according to the second embodiment of the present invention, a portion of the recirculation flow path 480 is formed in a spiral shape to minimize the overall length and smooth flow of exhaust gas. can induce Specifically, the recirculation flow path 480 may be formed in a swirl shape in a section connecting the flow meter 410 , the blower 420 , the burner 440 , and the decomposition chamber 450 .

In addition, the urea supply unit 460 may be disposed adjacent to the decomposition chamber 450 to minimize a line for supplying urea to the decomposition chamber 450 .

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

4 shows only the hot air blower 430 and the decomposition chamber 450 in the selective catalytic reduction system 103 . In the third embodiment of the present invention, the hot air blower 430 replaces the blower 420 and the burner 440 of the first embodiment. That is, the third embodiment of the present invention is the same as the first embodiment except that the hot air fan 430 is used instead of the blower 420 and the burner 440 .

Specifically, the hot air blower 430 may include a blower 432 and a heating unit 434 therein. And the heating unit 434 may be a heater.

By this configuration, in the selective catalytic reduction system 103 according to the third embodiment of the present invention, one hot air blower 430 replaces the blower 420 and the burner 440 of the first embodiment, so that the overall configuration is further improved can be simplified.

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, 102, 103: selective catalytic reduction system
210: first support
220: second support
301: reactor unit
310: body part
314: opening
319: body outlet
340: bypass unit
341: inlet
349: bypass outlet
343: guide vane
360: reducing agent injection unit
401, 402: reducing agent supply unit
410: flow meter
420: blower
430: hot air blower
440: burner
450: decomposition chamber
460: urea supply
480: recirculation flow path

Claims (9)

a first support;
a second support detachably coupled to an upper portion, a lower portion, or a side portion of the first supporter to form a multi-stage structure;
a reactor unit supported on the first support and reacting nitrogen oxides contained in exhaust gas with a reducing agent to reduce nitrogen oxides; and
A reducing agent supply unit supported by the second support and detachably connected to the reactor unit, decomposing a reducing agent and supplying it to the reactor unit
A selective catalytic reduction system comprising a. According to claim 1,
The reducing agent supply unit is a selective catalytic reduction system, characterized in that separable from the reactor unit supported on the first support together with the second support. According to claim 1,
The reactor unit is
a body portion having a main body outlet formed at one end and an opening formed at the other side thereof;
a bypass part integrally coupled to the other side of the body part having the opening and communicating with the inside of the body part through the opening, an inlet at one end and a bypass outlet at the other end; and
a catalyst disposed between the opening and the body outlet in the interior of the reactor body
characterized by comprising 4. The method of claim 3,
The reactor unit is installed inside the bypass unit adjacent to the opening of the main body, and is a guide vane for diffusing and moving the exhaust gas so that the exhaust gas flowing into the body through the opening evenly contacts the catalyst ) Selective catalytic reduction reactor, characterized in that it further comprises. 4. The method of claim 3,
The reactor unit further comprises a reducing agent injection unit coupled to the inlet to spray the reducing agent supplied from the reducing agent supply unit,
Selective catalytic reduction reactor, characterized in that the reducing agent injected from the reducing agent injection unit is mixed with the exhaust gas inside the bypass unit and then introduced into the reactor body through the opening. 6. The method of claim 5,
When the reducing agent injecting unit injects the reducing agent, the exhaust gas introduced into the bypass unit through the inlet moves to the reactor body through the opening and then is discharged to the main body outlet through the catalyst,
Selective catalytic reduction reactor, characterized in that when the reducing agent injection unit does not inject the reducing agent, the exhaust gas introduced into the bypass unit through the inlet is discharged to the bypass outlet. 6. The method of claim 5,
The reducing agent supply unit,
a recirculation passage having both ends separably connected to the rear end of the main body of the reactor unit and the reducing agent injection unit;
a flow meter installed on the recirculation passage;
a blower installed on the recirculation passage;
a burner installed on the recirculation passage;
a decomposition chamber installed on the recirculation passage; and
A urea supply unit for supplying urea to the decomposition chamber
A selective catalytic reduction system comprising a. 8. The method of claim 7,
The flow meter is installed at the farthest from the reactor unit,
the decomposition chamber is disposed between the flow meter and the reactor unit;
The blower blows the exhaust gas that has passed through the flow meter in the direction of the reactor unit,
The exhaust gas blown by the blower is heated by the burner and moves toward the decomposition chamber,
The selective catalytic reduction system, characterized in that the urea supply is arranged adjacent to the decomposition chamber. 6. The method of claim 5,
The reducing agent supply unit,
a recirculation passage connecting the rear end of the main body of the reactor unit and the reducing agent injection unit;
a flow meter installed on the recirculation passage;
a hot air fan installed on the recirculation passage;
a decomposition chamber installed on the recirculation passage; and
A urea supply unit for supplying urea to the decomposition chamber
A selective catalytic reduction system comprising a.

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