KR101613796B1 - Selective catalytic reuction system - Google Patents

Abstract

The embodiments of the present invention relate to a selective catalytic reduction system which comprises: an exhaust line through which exhaust gas passes; a reactor placed on the exhaust line to have a catalyst installed inside; a fluid input unit to let a heated fluid flow into the catalyst; and an opening and closing flow-uniforming unit installed in the front and rear of the catalyst to make the flow of exhaust gas uniform. During operation of exhaust purification, the opening and closing flow-uniforming unit makes the exhaust gas passing through the reactor have a uniform flow. During operation of catalyst regeneration, the opening and closing flow-uniforming unit divides the reactor, where the catalyst is installed, to increase the temperature of the catalyst by the heated fluid supplied from the fluid input unit.

Description

{SELECTIVE CATALYTIC REUCTION 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 effectively regenerating a poisoned catalyst.

Generally, the selective catalytic reduction system reduces nitrogen oxides (hereinafter referred to as " NOx ") contained in the exhaust gas of an engine to purify the exhaust gas discharged from the engine and discharge the exhaust gas to the outside.

Specifically, the selective catalytic reduction system injects a reducing agent such as Urea into the exhaust gas to reduce the NOx contained in the exhaust gas, and the exhaust gas mixed with the reducing agent passes through the catalyst and contains nitrogen and water vapor (or water) .

Therefore, the exhaust gas passing through the selective catalytic reduction system is decomposed into nitrogen and water vapor and is discharged to the outside.

However, the catalyst of the selective catalytic reduction system can be poisoned by the adsorption of a reducing agent (Ammonium bi-Sulfate) produced by reacting with a sulfur component in the exhaust gas. That is, such poisoning of the catalyst lowers the activity of the catalyst, thereby deteriorating the overall purification efficiency of the selective catalytic reduction system.

In the case of a conventional selective catalytic reduction system, the catalyst is directly heated to solve the poisoning of the catalyst, or the entire reactor is heated. However, when the catalyst is directly heated, it is difficult to solve the uniform poisoning throughout the catalyst area, and there arises a problem due to thermal cracking outside the catalyst due to direct heating.

In addition, when the temperature of the entire reactor is elevated, the problem of direct heating of the catalyst can be solved. However, since the entire area of the reactor without the catalyst is heated, a large amount of heat energy is consumed.

An embodiment of the present invention provides a selective catalytic reduction system capable of effectively regenerating a catalyst installed inside a reactor.

According to an embodiment of the present invention, a selective catalytic reduction system includes an exhaust line through which exhaust gas passes, a reactor disposed on the exhaust line and provided with a catalyst therein, a fluid inlet for introducing the heated fluid into the catalyst, And an open / close rectifying unit disposed at the front of the catalyst and behind the catalyst to uniformize the flow of the exhaust gas. When the exhaust purification operation is performed, the open / close rectifying unit rectifies the exhaust gas passing through the reactor, The open / close rectifying section divides the reactor provided with the catalyst and raises the temperature of the catalyst by the heated fluid supplied from the fluid inlet.

The fluid inlet may include a branch line for partially branching the exhaust gas that has passed through the catalyst and re-entering the catalyst in front of the catalyst, an inlet valve for controlling the exhaust gas flowing into the branch line, A blower, a heating member installed on the branch line for heating exhaust gas passing through the branch line, and a discharge valve for controlling an exhaust gas flowing back through the branch line to the front of the catalyst have.

In addition, the selective catalytic reduction system may open the inlet valve and the discharge valve when the catalyst regeneration operation is performed, operate the blower and the heating member, close the inlet valve and the discharge valve when the exhaust purification operation is performed And a controller for stopping the operation of the blower and the heating member.

The open / close rectifying part includes a plurality of guide members which rotate in a direction intersecting the exhaust gas inside the reactor when the catalyst regeneration operation is performed, and one end portion of the guide member cross each other to seal one region of the reactor provided with the catalyst .

Further, the catalyst of the selective catalytic reduction system may further include a first catalyst and a second catalyst located behind the first catalyst, wherein the exhaust gas before being introduced into the reactor is passed through the first catalyst A bypass line that can be fed forward of the second catalyst, and a bypass valve that opens and closes the exhaust gas flowing into the bypass line.

According to the embodiment of the present invention, the selective catalytic reduction system can effectively regenerate the catalyst installed inside the reactor.

1 is a configuration diagram illustrating an exhaust purifying operation of a selective catalytic reduction system according to an embodiment of the present invention.
2 is a view illustrating a catalyst regeneration operation of the selective catalytic reduction system according to an embodiment of the present invention.
FIG. 3 is a configuration diagram illustrating a catalyst regeneration operation of a partial catalyst of the selective catalytic reduction system according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

The drawings are schematic and illustrate that they are not drawn to scale. The relative dimensions and ratios of the parts in the figures are exaggerated or reduced in size for clarity and convenience in the figures, and any dimensions are merely illustrative and not restrictive. And to the same structural elements or parts appearing in more than one drawing, the same reference numerals are used to denote similar features.

The embodiments of the present invention specifically illustrate ideal embodiments of the present invention. As a result, various variations of the illustration are expected. Thus, the embodiment is not limited to any particular form of the depicted area, but includes modifications of the form, for example, by manufacture.

Hereinafter, a selective catalytic reduction system 101 according to an embodiment of the present invention will be described with reference to FIGS.

1, the selective catalytic reduction system 101 according to an embodiment of the present invention includes an exhaust line 200 through which an exhaust gas passes, a reactor 300 in which a catalyst 310 is installed, (400), and an open / close rectifier (500).

An engine (not shown) burns diesel fuel to produce power and exhausts the exhaust gas by this combustion. The exhaust gas emitted by the engine contains nitrogen oxides (hereinafter referred to as NOx).

The exhaust line 200 is connected to the engine so that the exhaust gas discharged from the engine passes through.

The reactor 300 is disposed on the exhaust line 200. In addition, a catalyst 310 is installed in the reactor 300. Specifically, the catalyst 310 can be a selective reduction catalyst through a catalyst carrier, which is made using materials known to those skilled in the art, such as zeolite, vanadium, or platinum .

The fluid inlet 400 introduces the heated fluid into the catalyst 310 installed inside the reactor 300. The heated fluid supplied through the fluid inlet portion 400 can raise the temperature of the catalyst 310 and burn the poisoned substance poisoned by the catalyst 310 to regenerate the catalyst 310.

The opening and closing rectifying part 500 is installed in front of the catalyst 310 and behind the catalyst 310 to make the flow of the exhaust gas uniform. Specifically, the open / close rectifying unit 500 is installed in front of the catalyst 310 installed inside the reactor 300 and behind the catalyst 310, respectively.

The open / close rectifying part 500 uniformly flows the flow of the exhaust gas flowing into the catalyst 310, so that the exhaust gas effectively passes through the flow path formed in the catalyst 310.

That is, the opening and closing rectifying part 500 may rectify the flow of the exhaust gas before passing through the catalyst 310 to allow the rectified exhaust gas to pass through the catalyst 310.

2, the opening and closing rectifying part 500 can selectively partition a region inside the reactor 300 in which the catalyst 310 is installed. That is, the open / close rectifying part 500 is opened and the exhaust gas flowing into the catalyst 310 can be rectified, or the catalyst 310 installed between the open / close rectifying part 500 can be partitioned.

Specifically, the selective catalytic reduction system 101 may further include a reducing agent injection member 600. The reducing agent injection member 600 injects a reducing agent such as urea (Urea) or ammonia to selectively reduce the NOx contained in the exhaust gas.

That is, the reducing agent injection member 600 injects the reducing agent into the exhaust gas passing through the exhaust line 200, and the exhaust gas mixed with the reducing agent can be introduced into the reactor 300.

As shown in FIG. 1, when the exhaust purification operation is performed, the open / close rectifying unit 500 is opened to rectify the exhaust gas passing through the reactor 300 so that the rectified exhaust gas passes through the catalyst 310. That is, when the exhaust purification operation is performed, the reducing agent injection member 600 injects the reducing agent into the exhaust gas, and the exhaust gas mixed with the reducing agent passes through the opening and closing rectifying section 500 and is rectified and can pass through the catalyst 310.

When the catalyst regeneration operation is performed, the open / close rectifying unit 500 closes the front and rear sides of the catalyst 310 to partition a region where the catalyst 310 is installed inside the reactor 300, The temperature of the catalyst 310 can be raised by the fluid. That is, when one area inside the reactor 300 in which the catalyst 310 is installed is partitioned by the open / close rectifying part 500, the heated fluid is supplied from the fluid inlet part 400 to the divided area, ). ≪ / RTI >

Therefore, in the selective catalytic reduction system 101 according to the embodiment of the present invention, when the catalyst 310 is installed in the region where the catalyst 310 inside the reactor 300 is installed, And the catalyst 310 is heated by supplying the fluid heated through the fluid inlet 400 to regenerate the catalyst 310. That is, the selective catalytic reduction system 101 according to an embodiment of the present invention not only raises the temperature of the entire region of the reactor 300 but also divides a region where the catalyst 310 inside the reactor 300 is installed, The temperature of the catalyst 310 can be raised and the catalyst 310 can be effectively regenerated even with a small heat source.

The fluid inlet 400 of the selective catalytic reduction system 101 according to an embodiment of the present invention includes a branch line 410, an inlet valve 420, a blower 430, a heating member 440 ), And a discharge valve (450).

The branch line 410 may divide a part of the exhaust gas that has passed through the catalyst 310 and re-introduce the exhaust gas to the front of the catalyst 310. One end of the branch line 410 is connected to the reactor 300 between the rear of the catalyst 310 and the opening and closing rectifier 500 disposed behind the catalyst 310. The other end of the branch line 410 is connected to the catalyst 300, The reactor 300 may be connected between the front of the catalyst 310 and the open / close rectifier 500 installed in front of the catalyst 310.

That is, the branch line 410 may guide a portion of the purified exhaust gas that has passed through the catalyst 310 to be reintroduced to the front of the catalyst 310.

The inlet valve 420 may be installed on the branch line 410 to open and close the exhaust gas passing through the catalyst 310 into the branch line 410.

The blower 430 is installed on the branch line 410 and can circulate the exhaust gas passing through the region where the catalyst 310 partitioned by the opening and closing rectifying section 500 is installed and the branch line 410.

That is, the blower 430 circulates the fluid so that the exhaust gas passing through the area where the catalyst 310 partitioned by the opening and closing rectifying part 500 is installed and the branch line 410 is circulated.

The heating member 440 may be installed on the branch line 410 to raise the temperature of the exhaust gas passing through the branch line 410. Specifically, the heating member 440 may raise the temperature of the exhaust gas passing through the branch line 410 so that the heated fluid flows into the front of the catalyst 310 through the branch line 410. That is, the heating member 440 can heat the exhaust gas passing through the branch line 410 as much as necessary for regeneration of the catalyst 310.

Further, the heating member 440 may be configured to be able to heat various types of exhaust gas such as a burner and an electric heater.

The discharge valve 450 is capable of opening and closing the discharge of the exhaust gas re-flowing to the front of the catalyst 310 through the branch line 410. Specifically, the discharge valve 450 can control the flow of the exhaust gas heated by the heating member 440 toward the front of the catalyst 310 along the branch line 410.

Accordingly, the fluid inflow part 400 branches a part of the exhaust gas passed through the catalyst 310 and raises the temperature to the heating member 440, and then the fluid heated through the blower 430 flows toward the front of the catalyst 310 So that the catalyst 310 can be regenerated.

The fluid inlet 400 according to an embodiment of the present invention can use the energy required for regeneration of the catalyst 310 by branching a part of the exhaust gas that has passed through the catalyst 310, The heat energy can be efficiently reduced as compared with the case where the heat energy is applied.

That is, the fluid inflow part 400 according to an embodiment of the present invention can effectively supply the heated fluid to the catalyst 310 installed in a large facility such as a ship and a plant, 440) can be efficiently reduced.

In addition, the selective catalytic reduction system 101 according to an embodiment of the present invention may further include a control unit 700.

The control unit 700 can operate the inlet valve 420, the discharge valve 450, the blower 430, and the heating member 440.

The control unit 700 can control the inlet valve 420, the discharge valve 450, the blower 430, and the heating member 440 according to the exhaust purification operation and the catalyst regeneration operation.

Specifically, the separation of the exhaust purifying operation and the catalyst regeneration operation of the selective catalytic reduction system 101 is performed by the corresponding technology such as the temperature of the catalyst, the NOx concentration contained in the exhaust gas passing through the catalyst, the load of the engine, And can be operated by the control unit 700 on the basis of a point in time when a catalyst regeneration known to a person in the field is required.

The control unit 700 closes the inlet valve 420 and the discharge valve 450 to close the catalyst 310 when the opening and closing rectifying unit 500 is in the exhaust purifying operation to uniformize the flow of the exhaust gas flowing into the catalyst 310. [ The inflow of the fluid flowing forward is blocked, and the operation of the blower 430 and the heating member 440 is stopped.

The control unit 700 opens the inlet valve 420 and the discharge valve 450 and opens the blower 450. When the opening and closing rectifier 500 is in the catalyst regeneration operation for partitioning one region of the reactor 300 in which the catalyst 310 is installed, 430 and the heating member 440 are operated to heat a part of the exhaust gas passing through the catalyst 310 to flow the heated fluid to the front of the catalyst 310 to effectively regenerate the catalyst 310.

The opening and closing rectifying section 500 may be operated manually by a user or may be controlled by the control section 700 using a separate power source such as a motor not shown.

Also, the open / close rectification part 500 of the selective catalytic reduction system 101 according to an embodiment of the present invention may include a plurality of guide members 511.

The plurality of guide members 511 are arranged in a direction intersecting with one direction through which the exhaust gas passes through the reactor 300 and can be rotatably supported by the reactor 300.

The plurality of guide members 511 can be rotated in the direction intersecting the exhaust gas inside the reactor 300 when the catalyst regeneration operation is performed to partition a region where the catalyst 310 inside the reactor 300 is installed. One end of the plurality of guide members 511 overlaps with each other to seal one region of the reactor 300 in which the catalyst 310 is provided.

That is, when the exhaust purification operation is performed, the open / close rectifying unit 500 rectifies the exhaust gas flowing into the catalyst 310. In the catalyst regeneration operation, the opening and closing rectifying unit 500 rotates in the direction crossing the exhaust gas, It is possible to effectively seal one region of the light emitting device 300.

The catalyst 310 of the selective catalytic reduction system 101 according to an embodiment of the present invention includes a first catalyst 311 and a second catalyst 312 and includes a bypass line 800 and a bypass valve 810).

The first catalyst 311 may be installed in the reactor 300 and the second catalyst 312 may be installed inside the reactor 300 located behind the first catalyst 311.

In addition, when a plurality of catalysts 310 are formed, the open / close rectifying part 500 may be installed to separately partition a region where the first catalyst 311 and the second catalyst 312 are installed.

Specifically, the open / close rectifying section 500 includes a front open / close rectifying section 510 provided in front of the first catalyst 311, a rear open / close rectifying section 520 provided at the rear of the first catalyst 311, And a rear opening and closing rectifier 520 installed at the rear of the second catalyst 312. The rear opening /

Alternatively, the open / close rectifying part 500 may include a front open / close rectifying part 510 provided in front of the first catalyst 311, a rear open / close rectifying part 520 installed at the rear of the second catalyst 312, And an intermediate open / close rectifying unit 530 installed between the second catalyst 312 and the second catalyst 312.

In the case where the catalyst 310 includes the first catalyst 311 and the second catalyst 312, a part of the exhaust gas that has passed through the first catalyst 311 is branched, And a second auxiliary branch line 412 for adhering a part of the exhaust gas that has passed through the first auxiliary branch line 411 and the second catalyst 312 into which the exhaust gas is introduced and re-introduced to the front of the second catalyst 312 .

The first auxiliary inlet valve 421 and the first auxiliary discharge valve 451 provided in the first auxiliary branch line 411 and the second auxiliary inlet valve 422 provided in the second auxiliary branch line 412, 2 auxiliary discharge valve 452, as shown in Fig.

The bypass line 800 may allow the exhaust gas before entering the reactor 300 to bypass the first catalyst 311 and feed it to the front of the second catalyst 312. Specifically, one end may be connected to the exhaust line 200, and the other end may be connected to the front of the second catalyst 312.

If there is a bypass line bypassing the unillustrated reactor 300, one end of the bypass line 800 may be connected to the bypass line and the other end may be connected to the front of the second catalyst 312.

The bypass valve 810 can open and close the exhaust gas flowing into the bypass line 800. Specifically, the bypass valve 810 can be installed on the bypass line 800 to open and close the exhaust gas flowing into the bypass line 800.

The controller 700 includes a first auxiliary inlet valve 421, a first auxiliary discharge valve 451, a second auxiliary inlet valve 422, a second auxiliary discharge valve 452, and a bypass valve 810 Can be controlled according to the regeneration necessity of the first catalyst 311 and the second catalyst 312.

Even when a plurality of catalysts 310 are installed inside the reactor 300, even if the first catalyst 311 in the inside of the reactor 300 performs the catalyst regeneration operation, the second catalyst 312 can be bypassed by the bypass valve 810 The exhaust gas flowing into the bypass line 800 opened by the bypass line 800 can be purified.

That is, the selective catalytic reduction system 101 according to an embodiment of the present invention performs a catalyst regeneration operation by partitioning only a region where a catalyst 310 requiring regeneration is installed among a plurality of catalysts 310, ) Can be used to perform the exhaust purifying operation.

Therefore, when a plurality of catalysts 310 are installed, the degree of poisoning of the first catalyst 311 installed in front of the reactor 300 is higher than that of the second catalyst 312. In this case, the selective catalytic reduction system 101 of the present invention may be configured such that even when the first catalyst 311 is being regenerated, the control unit 700 opens the bypass valve 810 so that the exhaust gas passing through the bypass line 800 The second catalyst 312 can be effectively operated.

Hereinafter, the operation of the selective catalytic reduction system 101 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG.

As shown in Fig. 1, when the exhaust purification operation is performed, the flow of the exhaust gas is made uniform in the open / close rectification part 500. [ Specifically, the exhaust gas that has passed through the open / close rectifying section 500 is supplied to the catalyst 310.

At this time, the reducing agent injection member 600 can inject the reducing agent into the exhaust gas by the control unit 700. [ That is, the exhaust gas mixed with the reducing agent can flow into the catalyst 310 by the flow of the exhaust gas by the open / close rectifying part 500.

As shown in FIG. 2, in the catalyst regeneration operation, the open / close rectification part 500 divides a region inside the reactor 300 in which the catalyst 310 is installed. Specifically, when the first catalyst 311 and the second catalyst 312 are installed, the front open / close rectifying part 510 provided at the front of the first catalyst 311 and the rear open / close rectifying part provided at the rear of the first catalyst 311, The first catalyst 311 is divided into a region inside the reactor 300 in which the first catalyst 311 is installed and the second open end of the second catalyst 312 The rear opening / closing rectifying unit 520 installed at the rear can be rotated to partition a region inside the reactor 300 in which the second catalyst 312 is installed.

The control unit 700 opens the first auxiliary inlet valve 421 and the first auxiliary discharge valve 451 to introduce the heated fluid into a region partitioned by the first catalyst 311 and the blower 430 And the heating member 440 are operated so that the exhaust gas having passed through the first catalyst 311 flowing into the branch line 410 through the first sub branch line 411 is heated to the front side of the first catalyst 311 It can be re-introduced.

In addition, the controller 700 opens the second auxiliary inlet valve 422 and the second auxiliary discharge valve 452 to introduce the heated fluid into a region partitioned by the second catalyst 312, The exhaust gas that has passed through the second catalyst 312 flowing into the branch line 410 through the second sub branch line 412 is heated and the second catalyst 312 is heated by operating the heating member 430 and the heating member 440, It can be re-introduced forward.

At this time, the control unit 700 stops the operation of the reducing agent injection member 600, and the exhaust gas generated when the engine is operated can be discharged to the outside through the bypass line bypassing the reactor 300 (not shown).

When the first catalyst 311 is required to regenerate the catalyst, the front open / close rectification part 510 of the first catalyst 311 and the rear open / close rectification part 520 of the first catalyst 311 are provided with the first catalyst 311 The front open and close rectification section 520 of the second catalyst 312 and the rear open and close rectification section 520 of the second catalyst 312 are opened to pass through the second catalyst 312 It is possible to rectify the flow of the exhaust gas.

At this time, the controller 700 opens the first auxiliary inlet valve 421 and the first auxiliary outlet valve 451 to introduce the heated fluid into a region partitioned by the first catalyst 311, The exhaust gas that has passed through the first catalyst 311 flowing into the branch line 410 through the first sub branch line 411 is heated and the first catalyst 311 is heated by operating the heating member 430 and the heating member 440, It can be re-introduced forward.

The control unit 700 closes the second auxiliary inlet valve 422 and the second auxiliary discharge valve 452 and opens the bypass valve 810 so that exhaust gas that has passed through the bypass line 800 is discharged to the second catalyst (312) and can pass through the second catalyst (312). At this time, the control unit 700 can operate the reducing agent injection member 600 to inject the reducing agent into the exhaust gas.

That is, the first catalyst 311 and the second catalyst 312 installed in one reactor can be divided into the open / close rectifying part 500, so that the first catalyst 311, which is required to be regenerated, 2 catalyst 312 can effectively perform the exhaust purification operation.

3, when the first catalyst 311 performs the catalyst regeneration operation and the second catalyst 312 performs the exhaust purifying operation, the front open / close rectifying section (for example, Closing rectifier 530 between the first catalyst 311 and the second catalyst 312 seals a region inside the reactor 300 in which the first catalyst 311 is installed. In addition, the rear open / close rectifying unit 520 installed at the rear of the second catalyst 312 can rectify the exhaust gas that has passed through the second catalyst 312 to reduce noise.

At this time, the controller 700 opens the first auxiliary inlet valve 421 and the first auxiliary outlet valve 451 to introduce the heated fluid into a region partitioned by the first catalyst 311, The exhaust gas that has passed through the first catalyst 311 flowing into the branch line 410 through the first sub branch line 411 is heated and the first catalyst 311 is heated by operating the heating member 430 and the heating member 440, It can be re-introduced forward.

The control unit 700 closes the second auxiliary inlet valve 422 and the second auxiliary discharge valve 452 and opens the bypass valve 810 so that exhaust gas that has passed through the bypass line 800 is discharged to the second catalyst (312) and can pass through the second catalyst (312). At this time, the control unit 700 can operate the reducing agent injection member 600 to inject the reducing agent into the exhaust gas.

When the control unit 700 determines that the regeneration of the first catalyst 311 is completed, the front opening and closing rectifying unit 510 and the intermediate opening and closing rectifying unit 530, which are provided in front of the first catalyst 311, So that the flow of the exhaust gas flowing into the second catalyst 312 can be rectified. At this time, the controller 700 closes the first auxiliary inlet valve 421, the first auxiliary discharge valve 451 and the bypass valve 810, and stops the operation of the blower 430 and the heating member 440.

Therefore, not only the second catalyst 312 but also the first catalyst 311 can perform the exhaust purifying operation.

The opening and closing part 500 of the selective catalytic reduction system 101 according to an embodiment of the present invention effectively separates one region of the inside of the reactor 300 provided with the catalyst 310, So that the catalyst 310 can be effectively regenerated.

The open / close rectifying part 500 not only uniforms the flow of the exhaust gas of the fluid but also rotates in the direction intersecting with the exhaust gas inside the reactor 300 to cover an area of the reactor 300 provided with the catalyst 310 It can be effectively sealed.

That is, not only the entire region of the reactor 300 but also a region inside the reactor 300 provided with the catalyst 310 partitioned by the open / close rectifying portion 500 disposed at the front of the catalyst 310 and at the rear of the catalyst 310 The temperature of the heating member 440 can be effectively raised even with a small load and the regeneration time of the catalyst 310 and the regeneration efficiency of the catalyst 310 can be improved.

The selective catalytic reduction system 101 according to an embodiment of the present invention includes a bypass line 800 so that even when the first catalyst 311 is being regenerated, Can be purified.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. will be.

It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

101: selective catalytic reduction system 200: exhaust line
310: Catalyst 311: First catalyst
312: second catalyst 400: fluid inlet
410: branch line 420: inlet valve
430: blower 440: heating member
450: Discharge valve 700:
800: Bypass line 810: Bypass valve

Claims (5)

An exhaust line through which the exhaust gas passes;
A reactor disposed on the exhaust line and having a catalyst therein;
A fluid inlet for introducing the heated fluid into the catalyst; And
And an opening / closing rectifying unit installed inside the reactor and disposed in front of the catalyst and behind the catalyst to uniform the flow of the exhaust gas,
/ RTI >
Closing rectification section rectifies the exhaust gas passing through the reactor, and when the catalyst regeneration operation is performed, the open / close rectification section divides the inside of the reactor in which the catalyst is installed, and supplies the heated fluid, supplied from the fluid inflow section, Wherein the temperature of the catalyst is raised by the catalytic reduction catalyst. The method of claim 1,
The fluid inlet
A branch line for partially branching the exhaust gas that has passed through the catalyst and re-introducing the exhaust gas to the front of the catalyst;
An inflow valve for controlling the exhaust gas flowing into the branch line;
A blower disposed on the branch line;
A heating member installed on the branch line to heat the exhaust gas passing through the branch line; And
A discharge valve for controlling the exhaust gas flowing back through the branch line to the front of the catalyst,
≪ / RTI > 3. The method of claim 2,
Wherein the blower and the heating member are operated by opening the inlet valve and the discharge valve when the catalyst regeneration operation is performed, closing the inlet valve and the discharge valve when the exhaust purification operation is performed, and operating the blower and the heating member Further comprising a control unit for stopping the catalytic converter. The method of claim 1,
The open /
And a plurality of guide members pivoting in a direction crossing the exhaust gas in the reactor when the catalyst regeneration operation is performed, and one end of the guide member crossing each other to seal one region of the reactor in which the catalyst is installed. 5. The method according to any one of claims 1 to 4,
Wherein the catalyst further comprises a first catalyst and a second catalyst located behind the first catalyst,
A bypass line through which exhaust gas before entering the reactor can be supplied to the front of the second catalyst while bypassing the first catalyst; And
A bypass valve for opening / closing the exhaust gas flowing into the bypass line
≪ / RTI >

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