KR101591190B1 - Exhaust gas purification device - Google Patents

Exhaust gas purification device Download PDF

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Publication number
KR101591190B1
KR101591190B1 KR1020140097177A KR20140097177A KR101591190B1 KR 101591190 B1 KR101591190 B1 KR 101591190B1 KR 1020140097177 A KR1020140097177 A KR 1020140097177A KR 20140097177 A KR20140097177 A KR 20140097177A KR 101591190 B1 KR101591190 B1 KR 101591190B1
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South Korea
Prior art keywords
exhaust gas
reactor
pipe
circulation pipe
catalyst
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KR1020140097177A
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Korean (ko)
Inventor
황진우
이주희
김종훈
김은택
이재문
Original Assignee
두산엔진주식회사
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Priority to KR1020140097177A priority Critical patent/KR101591190B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Toxicology (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

An embodiment of the present invention relates to an exhaust gas purifying device. The exhaust gas purifying device for purifying exhaust gas discharged from an engine comprises: a main pipe through which exhaust gas discharged from the engine passes; a reactor which has a catalyst inside and which is placed on the main pipe; a circulating pipe for branching a part of the exhaust gas passing through the main pipe to guide the exhaust gas to flow back into the main pipe; a connecting pipe for connecting the main pipe in front of the reactor and the circulating pipe; and an opening valve installed on the connecting pipe to shield the connecting pipe. The opening valve opens the connecting pipe for a part of the exhaust gas in front of the reactor to circumvent the catalyst along the circulating pipe when the pressure of the exhaust gas in front of the reactor exceeds the preset reference pressure value. The opening valve closes the connecting pipe for a part of the exhaust gas which has passed through the catalyst to flow back into the main pipe in front of the reactor along the circulating pipe when the pressure of the exhaust gas in front of the reactor is lower than the preset reference pressure value.

Description

[0001] EXHAUST GAS PURIFICATION DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust purification apparatus, and more particularly to an exhaust purification apparatus that can be installed in a narrow space.

BACKGROUND ART [0002] Generally, an exhaust purification apparatus is an apparatus for reducing nitrogen oxides contained in exhaust gas generated in a power system using an internal combustion engine such as a diesel engine.

The exhaust purification apparatus injects a reducing agent into the exhaust gas, and the exhaust gas mixed with the injected reducing agent and the exhaust gas passes through the catalyst of the reactor, and the nitrogen oxide contained in the exhaust gas is decomposed into nitrogen and steam and discharged to the outside.

Therefore, the nitrogen oxides contained in the exhaust gas of the exhaust purification apparatus are decomposed into nitrogen and water vapor, and the purified exhaust gas is discharged to the outside.

Further, when the exhaust gas passing through the catalyst is partially bypassed and the urea water is decomposed into ammonia, the circulation pipe is installed so as to bypass the reactor. Therefore, there is a problem that a large space is required to install such an exhaust purification apparatus.

In addition, when the exhaust purification apparatus purifies nitrogen oxides contained in the exhaust gas, soot and foreign substances are stuck in the flow path formed in the catalyst, thereby causing catalyst clogging which interferes with the flow of exhaust gas passing through the flow path, And the maintenance of the exhaust purification apparatus are frequently caused.

The embodiment of the present invention provides an exhaust purification apparatus which can be installed effectively even in a narrow space.

According to an embodiment of the present invention, an exhaust purifying apparatus for purifying exhaust gas discharged from an engine includes a main pipe through which exhaust gas discharged from the engine passes, a reactor disposed inside the main pipe, A circulation pipe for branching a part of the exhaust gas passing through the main pipe and guiding the part of the exhaust gas to be re-introduced into the main pipe, a connection pipe for connecting the main pipe and the circulation pipe in front of the reactor, Wherein the exhaust gas pressure in the front of the reactor exceeds a predetermined reference pressure value, and a part of the exhaust gas in front of the reactor is supplied to the catalyst through the circulation pipe, And the exhaust gas pressure in front of the reactor is lower than a preset reference Ryeokgap the connecting pipe so that the material flows into the main pipe of the reactor thereby closing the front part of the exhaust gas passing through the catalyst along the circulation pipe is less than.

In addition, the reactor may include a first flow path connecting the main pipe in front of the reactor and a main pipe in the rear of the reactor, and a second flow path connecting the first flow path and the circulation pipe .

The exhaust purification apparatus may further include a flow rate detecting unit installed inside the second flow path and detecting a flow velocity of the exhaust gas passing through the second flow path.

Alternatively, the exhaust purification apparatus may include a first opening / closing valve installed in a main pipe in front of the reactor to open / close a flow of exhaust gas flowing into the reactor, and a second opening / closing valve installed in a main pipe in the rear of the reactor, Wherein one end of the circulation pipe is connected to the main pipe between the first opening / closing valve and the front of the reactor, and the other end of the circulation pipe is connected to the main opening of the second opening / And one region of the circulation pipe may be installed adjacent to the reactor so as to be heated by thermal energy of the exhaust gas passing through the reactor.

The exhaust purification apparatus may further include a flow rate detector disposed in a region of the circulation pipe to detect a flow rate of the exhaust gas passing through the circulation pipe.

The exhaust purification apparatus may further include a blower installed on the circulation pipe for introducing the exhaust gas passed through the catalyst into the front of the reactor, an exhaust gas passage through which the urea water UREA is supplied, And a control unit for controlling the flow rate of the exhaust gas to be supplied to the urea-decomposing chamber according to the flow rate information of the exhaust gas detected by the flow rate detecting unit, And a control unit for controlling the display unit.

According to the embodiments of the present invention, the exhaust purification apparatus can be effectively installed even in a narrow space.

1 is a view showing a state in which an on-off valve of an exhaust purifying apparatus according to the first embodiment of the present invention is closed.
2 is a view showing a state in which the opening and closing valve of the exhaust purifying apparatus according to the first embodiment of the present invention is opened.
3 is a view showing a state in which the opening and closing valve of the exhaust purification apparatus according to the second embodiment of the present invention is closed.
4 is a view showing a state in which the opening and closing valve of the exhaust purification apparatus according to the second embodiment of the present invention is opened.

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.

In addition, in the various embodiments, elements having the same configuration are represented by the same reference symbols in the first embodiment, and in the other second embodiment, only the configurations different from those of the first embodiment are described .

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, an exhaust purification apparatus 101 according to a first embodiment of the present invention will be described with reference to Figs. 1 and 2. Fig.

The exhaust purification apparatus 101 purifies the exhaust gas discharged from the engine 10. Specifically, the exhaust purification apparatus 101 can remove nitrogen oxides (hereinafter referred to as " NOx ") contained in the exhaust gas discharged from the engine 10 and discharge it to the outside.

That is, the exhaust purification apparatus 101 can purify the exhaust gas discharged from the engine 10 and discharge it to the outside.

1, an exhaust purification apparatus 101 according to a first embodiment of the present invention includes a main pipe 100, a reactor 200 provided with a catalyst 210, a circulation pipe 300, A connection pipe 400, and an opening / closing valve 410.

The exhaust gas discharged from the engine 10 passes through the main pipe 100. That is, the main piping 100 guides the exhaust gas discharged from the engine 10 to pass through the main piping 100.

In the reactor 200, a catalyst 210 is installed. Specifically, catalyst 210 may be a selective reduction catalyst to help remove NOx contained in the exhaust gas. For example, a plurality of catalysts 210 may be installed inside the reactor 200.

Further, the reactor 200 is installed on the main piping 100. Specifically, the main piping 100 in front of the reactor 200 guides the flow of exhaust gas into the reactor 200, and the main piping 100 in the rear of the reactor 200 is connected to the exhaust gas passing through the reactor 200 Guide it to the outside.

The circulation pipe 300 branches a part of the exhaust gas passing through the main pipe 100 and re-flows into the main pipe 100 again. Particularly, the circulation pipe 300 allows part of the exhaust gas passing through the main pipe 100 to bypass the catalyst 210 and to flow into the main pipe 100 again.

The connection pipe 400 connects between the main pipe 100 and the circulation pipe 300. Specifically, the connection pipe 400 connects the main pipe 100 and the circulation pipe 300 in front of the reactor 200 to connect the exhaust gas passing through the main pipe 100 in front of the reactor 200 to the circulation pipe 300).

The on-off valve 410 may be installed on the connection pipe 400 to shield the connection pipe 400. Specifically, when the exhaust gas pressure in front of the reactor 200 exceeds a predetermined reference pressure value, the opening / closing valve 410 opens the connection pipe 400 to partially discharge the exhaust gas in front of the reactor 200, Can be introduced into the main pipe 100 by bypassing the catalyst 210 through the pipe 300.

That is, when soot or foreign substances are trapped in the flow path formed in the catalyst 210, the exhaust gas pressure in front of the reactor 200 may exceed the preset reference pressure value. At this time, the open / close valve 410 opens the connection pipe 400, so that some of the exhaust gas in front of the reactor 200 bypasses the catalyst 210 and can be discharged through the main pipe 100, The life of the exhaust purification apparatus 101 can be improved.

That is, when the open / close valve 410 opens the connection pipe 400, a part of the exhaust gas in front of the reactor 200 is bypassed and the pressure in front of the reactor 200 can be reduced.

The opening and closing valve 410 closes the connection pipe 400 when the exhaust gas pressure in front of the reactor 200 is less than a preset reference pressure value and a part of the exhaust gas that has passed through the catalyst 210 flows through the circulation pipe 300 And may be re-introduced to the front of the reactor 200.

That is, the purified exhaust gas passing through the catalyst 210 can be moved along the circulation pipe 300 and re-introduced to the front of the reactor 200.

Therefore, the predetermined reference pressure value may be a reference value that can determine clogging of the catalyst 210, and may be a predetermined pressure value by a test value.

Particularly, when the connection pipe 400 is opened by the opening / closing valve 410, a part of the exhaust gas in front of the reactor 200 bypasses the catalyst 210 and flows through the main pipe 100 at the rear of the reactor 200 To the outside. At this time, the remainder of the exhaust gas in front of the reactor 200 can pass through the catalyst 210 installed in the reactor 200.

Part of the exhaust gas that has passed through the catalyst 210 passes through the circulation pipe 300 and flows through the main pipe 100 in front of the reactor 200 when the connection pipe 400 is closed by the opening / closing valve 410. And can pass through the catalyst 210. At this time, the remainder of the exhaust gas that has passed through the catalyst 210 of the reactor 200 may be discharged to the outside through the main pipe 100 at the rear of the reactor 200.

That is, when the connection pipe 400 is opened by the opening / closing valve 410, the circulation pipe 300 can guide a part of the exhaust gas in front of the reactor 200 to bypass the catalyst 210. When the connection pipe 400 is closed by the opening / closing valve 410, the circulation pipe 300 passes part of the exhaust gas behind the reactor 200 to the main pipe 100 in front of the reactor 200 So that it can be guided to re-enter.

For example, the on-off valve 410 may be a flap valve or a check valve that opens in one direction. Accordingly, the on-off valve 410 is not controlled by a separate sensor but can open the connection pipe 400 when the mechanical pressure exceeds a preset reference pressure value.

In addition, the reactor 200 according to the first embodiment of the present invention may include a first flow path 205 and a second flow path 220 formed therein.

The first flow path 205 may connect the main piping 100 in front of the reactor 200 and the main piping 100 in the rear of the reactor 200. Also, a catalyst 210 may be installed on the first flow path 205.

The second flow path 220 may connect the first flow path 205 and the circulation pipe 300. Specifically, the second flow path 220 can guide the exhaust gas, which has passed through the first flow path 205, to flow into the circulation pipe 300. In addition, the catalyst 210 is not installed in the second flow path 220.

Therefore, a part of the purified exhaust gas passing through the catalyst 210 may move along the second flow path 220 and may be introduced into the circulation pipe 300.

When the open / close valve 410 opens the connection pipe 400, a part of the exhaust gas in front of the reactor 200 moves along the circulation pipe 300 and flows into the first flow path 205 of the reactor 200 And can be discharged to the outside along the main pipe 100 at the rear of the reactor 200 through the second flow path 220 while bypassing the installed catalyst 210.

Therefore, the exhaust gas traveling along the circulation pipe 300 by the second flow path 220 bypasses the catalyst 210 and can be discharged to the outside through the main pipe 100 at the rear of the reactor 200.

Particularly, a partition wall 230 is provided in the reactor 200 to partition the first flow path 205 in which the catalyst 210 is installed and the second flow path 220 in which the catalyst 210 is not installed. One side of the partition 230 may be open to allow the first flow path 205 and the second flow path 220 to communicate with each other. That is, the partition 230 may be elongated in one direction along the direction of the exhaust gas passing through the reactor 200.

Therefore, since the first flow path 205 and the second flow path 220 are formed in the reactor 200, the restriction of the installation space of the exhaust purification apparatus 101 according to the first embodiment of the present invention can be reduced .

That is, the exhaust purification apparatus 101 according to the embodiment of the present invention can be effectively installed in a narrow area.

The first flow path 205 and the second flow path 220 may be formed in the reactor 200 so that the exhaust gas flowing back into the main piping 100 in front of the reactor 200 along the circulation piping 300 The temperature of the gas can be effectively kept warm.

Specifically, when the circulating pipe 300, through which a part of the exhaust gas having passed through the catalyst 210 flows, is installed to bypass the reactor 200 as in the prior art, the exhaust gas flowing along the circulating pipe 300 The exhaust purifying apparatus 101 of the first embodiment of the present invention can prevent heat loss by the first flow path 205 and the second flow path 220 formed in the reactor 200 .

The flow rate detector 500 may be installed on the second flow path 220 of the exhaust purification apparatus 101 according to the first embodiment of the present invention.

The flow rate detector 500 can detect the flow rate of the exhaust gas passing through the second flow path 220. Specifically, the flow rate detector 500 can detect the flow rate of the exhaust gas passing through the circulation pipe 300 by detecting the flow rate of the exhaust gas passing through the second flow path 220.

For example, the flow rate detector 500 may be installed in an orifice type.

In addition, the flow rate detector 500 according to the first embodiment of the present invention can be compactly installed on the second flow path 220.

Specifically, in order to install the orifice type flow rate detector 500, a straight pipe having a predetermined length or more should be formed. However, the second flow path 220 according to the first embodiment of the present invention is formed into a straight pipe So that the flow rate detector 500 can be installed effectively.

The exhaust purification apparatus 101 according to the first embodiment of the present invention may further include a blower 310, a urea water decomposition chamber 330, and a control unit 600.

The blower 310 is installed on the circulation pipe 300 and can control the flow of the fluid so that the exhaust gas passing through the circulation pipe 300 is moved to the main pipe 100 in front of the reactor 200. Particularly, when the blower 310 is operated, a part of the exhaust gas that has passed through the catalyst 210 flows into the circulation pipe 300 and can be supplied again to the main pipe 100 in front of the reactor 200.

The urea water decomposition chamber 330 is installed on the circulation pipe 300 and can supply the urea water by the exhaust heat of the exhaust gas flowing into the circulation pipe 300 and decompose it into ammonia.

That is, the urea water decomposition chamber 330 can decompose the urea water supplied to the exhaust heat of the exhaust gas flowing into the circulation pipe 300 into ammonia.

The ammonia that has passed through the urea water decomposition chamber 330 moves along with the exhaust gas along the circulation pipe 300 and may be supplied to the main pipe 100 in front of the reactor 200 and may be introduced into the reactor 200 .

Thus, exhaust gas mixed with ammonia flows into the reactor 200, which passes through the catalyst 210 and the NOx contained in the exhaust gas can be decomposed into nitrogen and water vapor.

The control unit 600 detects the flow rate information of the exhaust gas flowing through the second flow path 220 detected by the flow rate detector 500 and controls the rotation speed of the blower 310 to control the flow rate of the exhaust gas flowing through the circulation pipe 300 Can be controlled.

In addition, the exhaust purification apparatus 101 according to the first embodiment of the present invention may further include a heating unit 320.

The heating unit 320 may be installed on the circulation pipe 300 between the urea water decomposition chamber 330 and the blower 310 to raise the temperature of the exhaust gas passing through the circulation pipe 300.

Specifically, the heating unit 320 can increase the temperature of the exhaust gas flowing into the elliptical water-decomposing chamber 330, effectively decomposing urea water into ammonia in the elliptic water-decomposing chamber 330.

In addition, the operation of the heating unit 320 can be controlled by the control unit 600.

Specifically, the exhaust purification apparatus 101 according to the first embodiment of the present invention includes a branch piping 150, a first on-off valve 110, a second on-off valve 120, and a third on- ).

The branch piping 150 can guide the exhaust gas branched from the main piping 100 and passing through the main piping 100 to bypass the reactor 200. [

That is, the exhaust gas that has passed through the branch piping 150 can be discharged to the outside without being purified.

The third on-off valve 130 is installed on the branch pipe 150 and can shield the exhaust gas flowing into the branch pipe 150.

The first opening and closing valve 110 may be installed in the main pipe 100 in front of the reactor 200 to shield the exhaust gas flowing into the reactor 200.

The second on-off valve 120 may be installed in the main pipe 100 at the rear of the reactor 200 to shield the exhaust gas passing through the reactor 200.

The first opening / closing valve 110, the second opening / closing valve 120, and the third opening / closing valve 130 may be controlled by the controller 600.

Specifically, when the power system such as a ship having the exhaust purification apparatus 101 does not need purification of exhaust gas, the control unit 600 opens the third on-off valve 130 to open the branch pipe 150, The opening / closing valve 110 may be closed to shut off the exhaust gas flowing into the reactor 200.

At this time, the controller 600 may close the third on-off valve 130.

When the power system having the exhaust purification apparatus 101 needs to purify the exhaust gas, the control unit 600 closes the third on-off valve 130 to close the branch pipe 150 and the first on- So that the exhaust gas discharged from the engine 10 can be introduced into the reactor 200.

At this time, the control unit 600 may open the third opening / closing valve 130 so that the purified exhaust gas passing through the reactor 200 may be discharged to the outside through the main pipe 100 at the rear of the reactor 200.

The exhaust purification apparatus 101 according to the first embodiment of the present invention re-inflows the exhaust gas that has passed through the catalyst 210 by using the on-off valve 410 and the circulation pipe 300, When the catalyst 210 is clogged, the exhaust gas in front of the reactor 200 bypasses the catalyst 210 and is effectively discharged to the main pipe 100 at the rear of the reactor 200 .

The exhaust purification apparatus 101 includes a first flow path 205 and a second flow path 220 formed therein and an exhaust gas flowing into the circulation pipe 300 from the inflow or recycling pipe 300 flows through the second flow path 300, It is possible to reduce the installation space limitation of the exhaust purification device 101 and improve the installation degree of the exhaust purification device 101. [

Hereinafter, an exhaust purification apparatus 102 according to a second embodiment of the present invention will be described with reference to Figs. 3 to 4. Fig.

The exhaust purification apparatus 102 according to the second embodiment of the present invention is different from the exhaust purification apparatus 102 according to the second embodiment except for the installation position of the circulation pipe 300 of the exhaust purification apparatus 101 of the first embodiment and the installation position of the flow rate detection unit 500 The configuration may be equally included.

3, the circulation pipe 300 of the exhaust purification apparatus 102 according to the second embodiment of the present invention has one end connected to the main pipe 100 in front of the reactor 200, The main pipe 100 may be connected to the main pipe 100 at a rear side of the main body 200.

One end of the circulation pipe 300 is connected to the main pipe 100 between the first opening and closing valve 110 and the front of the reactor 200 and the other end is connected to the main pipe 100 ).

In addition, one region between one end and the other end of the circulation pipe 300 may be disposed adjacent to the reactor 200. That is, one region of the circulation pipe 300 is disposed adjacent to the reactor 200 so that the exhaust gas passing through one region of the circulation pipe 300 is heated by the exhaust heat of the exhaust gas passing through the reactor 200 .

In addition, since one area of the circulation pipe 300 can be disposed adjacent to the reactor 200, the exhaust purification apparatus 102 according to the second embodiment of the present invention can have a freedom of installation space.

The other end of the circulation pipe 300 according to the second embodiment of the present invention can be formed behind the second opening and closing valve 120 so that the exhaust gas of the exhaust purification apparatus 101 A part of the exhaust gas in front of the reactor 200 flows through the connecting pipe 400 and the circulating pipe 300 and flows into the reactor 200 when the second open / close valve 120, which may occur during the gas purge operation, And can be guided to the main pipe 100 at the rear and discharged to the outside.

That is, not only the clogging of the catalyst 210 but also the opening / closing valve 410 is opened when the second on-off valve 120 fails, and a part of the exhaust gas in front of the reactor 200 flows through the connecting pipe 400 and the circulating pipe 300 and may be discharged to the main piping 100 at the rear of the reactor 200.

Accordingly, the other end of the circulation pipe 300 according to the second embodiment of the present invention can be formed at the rear of the second on-off valve 120, It is possible to prevent the damage of the catalyst 210 due to the high pressure state in the inside of the exhaust purification device 102 and the life of the exhaust purification device 102.

The flow rate detector 500 of the exhaust purifier 102 according to the second embodiment of the present invention may be installed in one area of the circulation pipe 300.

The flow rate detector 500 may be of the orifice type according to the first embodiment described above. Specifically, one region of the circulation pipe 300 may be formed to be long in one direction along the longitudinal direction of the reactor 200, and may be installed adjacent to the reactor 200.

Therefore, the orifice type flow rate detector 500 can be effectively installed in one region of the circulation pipe 300 formed in one direction along the longitudinal direction of the reactor 200.

According to the above construction, the opening / closing valve 410 of the exhaust purifying apparatus 102 according to the second embodiment of the present invention is configured such that the exhaust gas pressure in front of the reactor 200, A part of the exhaust gas in front of the reactor 200 communicates with one region of the connection pipe 400 and the circulation pipe 300 and flows through the main pipe (100).

Therefore, the life of the exhaust purification apparatus 101 can be effectively improved by the installation position of the opening / closing valve 410 and the circulation pipe 300.

One region of the circulation pipe 300 is installed adjacent to the reactor 200 so that the exhaust gas passing through one region of the circulation pipe 300 can be heated by the exhaust heat of the exhaust gas passing through the reactor 200 So that the exhaust purification apparatus 102 can be compactly installed.

That is, the predetermined reference pressure value at which the opening / closing valve 410 of the second embodiment is opened may be set to a reference pressure value considering clogging of the catalyst 210 and malfunction of the second opening / closing valve 120.

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.

10: engine 100: main piping
101, 102: exhaust purification apparatus 110: first opening / closing valve
120: second open / close valve 130: third open / close valve
200: reactor 205: first flow
210: Catalyst 220:
230: partition wall 300: circulation piping
310: blower 320: heating part
330: Urea water decomposition chamber 400: Connection piping
410: opening / closing valve 500: flow rate detector
600:

Claims (6)

An exhaust purification apparatus for purifying an exhaust gas discharged from an engine,
A main pipe through which exhaust gas discharged from the engine passes;
A reactor having a catalyst installed therein and located on the main pipe;
A circulation pipe for branching a part of the exhaust gas passing through the main pipe and guiding it to be re-introduced into the main pipe;
A connection pipe connecting the main pipe in front of the reactor and the circulation pipe; And
An opening / closing valve provided on the connection pipe for shielding the connection pipe;
/ RTI >
The on-
Opening the connection pipe so that a part of the exhaust gas in front of the reactor bypasses the catalyst along the circulation pipe when the exhaust gas pressure in front of the reactor exceeds a preset reference pressure value, And closes the connection pipe so that a part of the exhaust gas that has passed through the catalyst is re-introduced into the main pipe in front of the reactor along the circulation pipe when the exhaust gas temperature is less than the preset reference pressure value.
The method of claim 1,
The reactor comprises:
A first flow path connecting the main piping in front of the reactor and the main piping in the rear of the reactor, the catalyst being installed in the first flow path; And
A second flow path connecting the first flow path and the circulation pipe,
And an exhaust purifier.
3. The method of claim 2,
Further comprising: a flow rate detecting unit installed in the second flow path for detecting a flow rate of exhaust gas passing through the second flow path.
The method of claim 1,
A first opening / closing valve installed in a main pipe in front of the reactor for opening / closing a flow of exhaust gas flowing into the reactor; And
And a second on-off valve installed in a main pipe behind the reactor for opening and closing a flow of exhaust gas passing through the reactor,
Wherein one end of the circulation pipe is connected to the main pipe between the first opening and closing valve and the front of the reactor and the other end of the circulation pipe is connected to the main pipe at the rear end of the second opening and closing valve, Wherein the catalyst is installed in contact with the reactor so that the temperature of the exhaust gas is raised by thermal energy of the exhaust gas passing through the reactor.
5. The method of claim 4,
Further comprising: a flow rate detecting unit installed at one side of the circulation pipe to detect a flow velocity of the exhaust gas passing through the circulation pipe.
The method according to claim 3 or 5,
A blower installed on the circulation pipe for introducing the exhaust gas passed through the catalyst to the front of the reactor;
A urea-decomposing chamber for receiving the urea water UREA and decomposing the supplied urea water into ammonia by the thermal energy of the exhaust gas passing through the circulation pipe; And
And a controller for controlling the blower to regulate the flow rate of the exhaust gas supplied to the urea water decomposition chamber in accordance with the flow rate information of the exhaust gas detected by the flow rate detector,
Further comprising:
KR1020140097177A 2014-07-30 2014-07-30 Exhaust gas purification device KR101591190B1 (en)

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Cited By (2)

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CN108506735A (en) * 2018-06-07 2018-09-07 上海梅山工业民用工程设计研究院有限公司 A kind of coking waste gas recovery governing system
KR20190127244A (en) * 2018-05-04 2019-11-13 엠에이티플러스 주식회사 Apparatus for treating waste gas

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KR101366898B1 (en) 2012-04-24 2014-02-24 두산엔진주식회사 Selective catalytic reuction system for internal combustion engine

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KR101366898B1 (en) 2012-04-24 2014-02-24 두산엔진주식회사 Selective catalytic reuction system for internal combustion engine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190127244A (en) * 2018-05-04 2019-11-13 엠에이티플러스 주식회사 Apparatus for treating waste gas
KR102177129B1 (en) * 2018-05-04 2020-11-10 엠에이티플러스 주식회사 Apparatus for treating waste gas
CN108506735A (en) * 2018-06-07 2018-09-07 上海梅山工业民用工程设计研究院有限公司 A kind of coking waste gas recovery governing system
CN108506735B (en) * 2018-06-07 2023-06-27 上海梅山工业民用工程设计研究院有限公司 Coking waste gas recovery and treatment system

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