KR20160110001A - Scr system and control method thereof - Google Patents

Scr system and control method thereof Download PDF

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KR20160110001A
KR20160110001A KR1020150086418A KR20150086418A KR20160110001A KR 20160110001 A KR20160110001 A KR 20160110001A KR 1020150086418 A KR1020150086418 A KR 1020150086418A KR 20150086418 A KR20150086418 A KR 20150086418A KR 20160110001 A KR20160110001 A KR 20160110001A
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exhaust gas
line
scr reactor
temperature
recycle
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KR102204687B1 (en
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이정일
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현대중공업 주식회사
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    • 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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/14—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a fuel burner
    • 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
    • F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses
    • F01N2340/06—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses characterised by the arrangement of the exhaust apparatus relative to the turbine of a turbocharger
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1404—Exhaust gas temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y02T10/24—
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

The present invention relates to an SCR system in which exhaust gas discharged from an SCR reactor is re-circulated to be used for urea hydrolysis, and a method thereof. According to the present invention, the SCR system comprises: an SCR reactor in which an SCR catalyst for removing a harmful ingredient from exhaust gas coming out of a turbocharger (T/C); a first exhaust gas line for inducing the exhaust gas discharged from the T/C to the SCR reactor; a second exhaust gas line installed in the rear end of the SCR reactor to discharge exhaust gas; a bypass line whose one end is connected to the first exhaust gas line and the other end is connected to the second exhaust gas line; a re-circulation line whose one end is connected to the second exhaust gas line and the other end is connected to the bypass line; a heating device for heating the exhaust gas flowing in the re-circulation line; a urea injection device for injecting urea to the exhaust gas which is re-circulated; and a control unit for re-circulating the exhaust gas discharged from the SCR reactor to the SCR reactor again through the re-circulation line and the bypass line, and driving the heating device and the urea injection device. According to the present invention, a pipe line is connected to re-circulate exhaust gas discharged from an SCR reactor through a bypass line to the SCR reactor again. As a urea injection nozzle is installed in the pipe line to perform urea hydrolysis without a separate urea hydrolysis chamber. Therefore, a structure can be simplified.

Description

SCR 시스템 및 그 제어 방법{SCR SYSTEM AND CONTROL METHOD THEREOF}[0001] SCR SYSTEM AND CONTROL METHOD THEREOF [0002]

본 발명은 SCR 시스템 및 그 제어 방법에 관한 것으로서, 특히 SCR 반응기에서 배출되는 배기가스를 재순환하여 우레아 가수분해에 이용할 수 있도록 하는 SCR 시스템 및 그 제어 방법에 관한 것이다.The present invention relates to an SCR system and a control method thereof, and more particularly, to an SCR system and a control method thereof, in which the exhaust gas discharged from an SCR reactor can be recycled and used for urea hydrolysis.

일반적으로 선박에는 선박을 추진시키기 위해 프로펠러를 구동하는 메인 엔진과 선박에 탑재된 각종 장비나 의장품 등에 전원을 공급하기 위한 보조 동력 시스템인 보조 엔진이 설치되어 운영되고 있다.Generally, a ship is equipped with a main engine that drives the propeller to propel the ship, and an auxiliary engine that is an auxiliary power system for supplying power to various equipments and equipment mounted on the ship.

이러한 선박 엔진에서 연소 후 배출되는 배기가스에는 다수의 부유성 미립자와 질소 산화물인 NOx, 황산화물인 SOx 등의 유해성 물질이 포함되어 있다.The exhaust gas discharged after combustion in such a marine engine contains a large number of floating fine particles, NOx which is nitrogen oxide, and SOx which is sulfur oxides.

따라서 엔진의 배기 라인에는 매연 여과 장치(DPF:Diesel Particulate Filter), 선택적 촉매 환원 장치(SCR:Selective Catalytic Reduction), 스크러버(Scrubber, SOx 제거) 등을 설치하여 배기가스 내의 유해 성분을 제거하고 있다.Therefore, the exhaust line of the engine is provided with a diesel particulate filter (DPF), a selective catalytic reduction (SCR), and a scrubber (SOx removal) to remove harmful components in the exhaust gas.

이 중에서 SCR 시스템은 배기가스 내의 질소 산화물(NOx)을 촉매(Catalyst) 층에서 암모니아(NH3), 우레아(Urea) 등의 환원제와의 화학적 반응을 통해 인체에 무해한 물과 질소로 분해한 후 배출시키는 장치이다.Among them, the SCR system decomposes nitrogen oxide (NOx) in the exhaust gas into harmless water and nitrogen through a chemical reaction with a reducing agent such as ammonia (NH3) and urea in the catalyst layer, Device.

여기서 SCR 촉매(Catalyst)는 압출 혹은 금속성 코팅이 형성된 다공질 촉매 필터로 이루어진 것으로서, 배기 라인에 설치된 SCR 반응기 내에 한 개 또는 두 개가 연속 설치되어 배기가스 내의 유해 성분을 제거하게 된다.Here, the SCR catalyst is made of a porous catalyst filter formed with extrusion or metallic coating. One or two SCR reactors installed in the exhaust line are continuously installed to remove harmful components in the exhaust gas.

기존의 대형엔진용 SCR 시스템은 ABS(Ammonium Bisulfate:NH4HSO4) 생성 방지, 분해 및 NOx 제거를 위하여 연료 중 황 함량에 따라 250℃ 이상의 고온이 필요함에 따라 엔진 튜닝을 통해 배기가스 온도를 높이거나, 배기가스 온도가 250~500℃인 엔진 T/C(Turbo Charger) 전단에 설치된다.Conventional large-scale engine SCR systems require a high temperature of 250 ° C or higher depending on the sulfur content of the fuel to prevent the formation of ABS (Ammonium Bisulfate: NH4HSO4), decompose and remove NOx, (Turbo Charger) with a gas temperature of 250 to 500 ° C.

이와 같이 SCR 시스템이 T/C 전단에 설치되는 경우 SCR 시스템으로 유입되는 배기가스의 압력이 높기 때문에 고압 SCR 시스템이라 불린다.Thus, when the SCR system is installed at the front of the T / C, it is called a high-pressure SCR system because the pressure of the exhaust gas flowing into the SCR system is high.

그러나 SCR 시스템을 T/C 전단에 설치하게 되면, 협소한 엔진룸으로 인하여 SCR 시스템의 배치에 어려움이 있다.However, when the SCR system is installed in front of the T / C, it is difficult to arrange the SCR system due to the narrow engine room.

이러한 문제점을 해결하기 위해 배기가스 온도가 150~300℃이며, 압력은 대기압 수준인 T/C 후단에 SCR 시스템을 설치할 수 있다.To solve this problem, the SCR system can be installed at the exhaust gas temperature of 150 to 300 ° C. and the pressure at the atmospheric pressure T / C downstream.

SCR 시스템을 T/C 후단에 설치하게 되면, 엔진룸 외부에 SCR 시스템을 설치할 수 있게 됨에 따라 SCR 시스템을 공간 제약 없이 자유로이 배치할 수 있게 된다.When the SCR system is installed at the rear end of the T / C, the SCR system can be installed outside the engine room, so that the SCR system can be freely placed without any restriction on the space.

그러나 SCR 시스템을 T/C 후단에 설치하게 되면, 배기가스의 낮은 온도로 인하여 NOx 제거 성능의 확보가 어렵고, ABS 분해 제거 및 안정적인 환원제 분해 공급 등에 문제가 발생한다.However, if the SCR system is installed at the downstream end of the T / C, it is difficult to secure the NOx removal performance due to the low temperature of the exhaust gas, and problems such as ABS decomposition removal and stable decomposition and supply of the reducing agent occur.

즉 SCR 시스템이 배기가스 내의 질소 산화물(NOx)을 제거할 때 생성되는 ABS는 특정 온도(예를 들어, 340도) 이상에서는 기체 상태가 되지만, 특정 온도 이하에서는 액체 상태가 되어 SCR 촉매에 달라붙게 되면서, SCR 촉매 표면의 활성점을 덮어버려 SCR 촉매의 성능이 저하되는 문제점이 있다.That is, ABS generated when the SCR system removes nitrogen oxides (NOx) in the exhaust gas becomes a gaseous state at a certain temperature (for example, 340 degrees) or more, but becomes liquid at a certain temperature or lower, There is a problem that the performance of the SCR catalyst is deteriorated by covering the active sites of the SCR catalyst surface.

그리고 SCR 시스템이 T/C 전단에 설치되는 경우에는 SCR 시스템으로 유입되는 배기가스의 온도가 최소 330℃ 이상으로 환원제 분해에 큰 문제가 없다. 그러나 SCR 시스템이 T/C 후단에 설치되는 경우에는 SCR 시스템으로 유입되는 배기가스의 온도가 250℃로 낮아 엔진을 튜닝하여 배기가스 온도를 280~350℃로 올리거나, 환원제인 우레아 수용액 분해를 위한 별도의 장치 즉, 우레아 가수분해 장치를 필요로 하게 된다.When the SCR system is installed at the front side of the T / C, the temperature of the exhaust gas flowing into the SCR system is at least 330 ° C or more, and there is no significant problem in decomposing the reducing agent. However, when the SCR system is installed at the rear end of the T / C, the temperature of the exhaust gas flowing into the SCR system is as low as 250 ° C. Thus, the engine is tuned to increase the exhaust gas temperature to 280 to 350 ° C., A separate apparatus, that is, a urea hydrolysis apparatus, is required.

한국공개특허공보 제10-2014-0000556호(공개일 2014.01.03.)Korean Patent Laid-Open Publication No. 10-2014-0000556 (Publication date 2014.01.03.)

본 발명은 전술한 문제점을 해결하기 위해 안출된 것으로서, SCR 반응기에서 배출되는 배기가스가 바이패스 라인을 통해 다시 SCR 반응기로 재순환되도록 배관 라인을 연결하고, 이 배관 라인에 우레아 분사 노즐을 설치하여, 별도의 우레아 가수분해 챔버 없이 우레아 가수분해를 수행할 수 있도록 하는 SCR 시스템 및 그 제어 방법을 제공함에 그 목적이 있다.The present invention has been conceived to solve the above-described problems, and it is an object of the present invention to provide an exhaust gas purifying apparatus, which connects a piping line so that exhaust gas discharged from an SCR reactor is recycled back to an SCR reactor through a bypass line, An SCR system capable of performing urea hydrolysis without a separate urea hydrolysis chamber, and a control method thereof.

본 발명의 다른 목적은 재순환되는 배기가스가 가열 장치로 주입되는 연소 공기와 열교환시켜 가열 장치의 연료 소모량을 최소화할 수 있도록 함에 있다.Another object of the present invention is to minimize the amount of fuel consumed by the heating apparatus by exchanging the recirculated exhaust gas with the combustion air injected into the heating apparatus.

본 발명의 또 다른 목적은 재순환 배관 라인 내의 온도를 우레아 가수분해에 적합한 온도로 조절할 수 있도록 함에 있다.It is a further object of the present invention to enable the temperature in the recycle line to be adjusted to a temperature suitable for urea hydrolysis.

전술한 목적을 달성하기 위한 본 발명의 일 실시예에 따른 SCR 시스템은, T/C(Turbo Charger)를 거쳐 나오는 배기가스 내의 유해 성분을 제거하는 SCR 촉매가 설치된 SCR 반응기; 상기 T/C에서 배출되는 배기가스를 상기 SCR 반응기로 유도하는 제1배기가스 라인; 상기 SCR 반응기 후단에 설치되어 배기가스를 배출하는 제2배기가스 라인; 일단이 상기 제1배기가스 라인에 연결되고 타단이 상기 제2배기가스 라인에 연결되는 바이패스 라인; 일단이 상기 제2배기가스 라인에 연결되고 타단이 상기 바이패스 라인에 연결되는 재순환 라인; 상기 재순환 라인으로 유입된 배기가스를 가열시키는 가열 장치; 상기 재순환되는 배기가스에 우레아를 분사하는 우레아 분사 장치; 및 상기 재순환 라인과 상기 바이패스 라인을 통해 상기 SCR 반응기에서 배출되는 배기가스를 다시 상기 SCR 반응기로 재순환시키고, 상기 가열 장치 및 우레아 분사 장치를 구동시키는 제어부;를 포함하여 이루어지는 것이 바람직하다.According to an aspect of the present invention, there is provided an SCR system comprising: an SCR reactor provided with an SCR catalyst for removing harmful components in exhaust gas passing through a turbocharger; A first exhaust gas line for leading the exhaust gas discharged from the T / C to the SCR reactor; A second exhaust gas line disposed downstream of the SCR reactor for discharging exhaust gas; A bypass line having one end connected to the first exhaust gas line and the other end connected to the second exhaust gas line; A recirculation line having one end connected to the second exhaust gas line and the other end connected to the bypass line; A heating device for heating the exhaust gas flowing into the recycle line; A urea injection device for injecting urea into the recirculated exhaust gas; And a control unit for recirculating the exhaust gas discharged from the SCR reactor to the SCR reactor through the recycle line and the bypass line and driving the heating apparatus and the urea spraying apparatus.

한편 본 발명의 일 실시예에 다른 SCR 시스템 제어 방법은, 운전 여부를 판단하는 운전 여부 판단 과정; 및 상기 운전 여부 판단결과 운전중이면, T/C에서 배출되는 배기가스가 SCR 반응기를 거쳐 배출되도록 하되, 상기 SCR 반응기에서 배출되는 배기가스를 재순환 라인 및 바이패스 라인을 통해 다시 상기 SCR 반응기로 재순환시키는 과정;을 포함하여 이루어지는 것이 바람직하다.According to another aspect of the present invention, there is provided a method for controlling an SCR system, the method comprising: The exhaust gas discharged from the SCR reactor is recycled to the SCR reactor through the recycle line and the bypass line, and the exhaust gas discharged from the SCR reactor is recycled to the SCR reactor through the recycle line and the bypass line. The method comprising:

본 발명의 SCR 시스템 및 그 제어 방법에 따르면, SCR 반응기에서 배출되는 배기가스가 바이패스 라인을 통해 다시 SCR 반응기로 재순환되도록 배관 라인을 연결하고, 이 배관 라인에 우레아 분사 노즐을 설치하여, 별도의 우레아 가수분해 챔버 없이 우레아 가수분해를 수행토록 함으로써, 구조를 단순화할 수 있게 된다.According to the SCR system and the control method of the present invention, the piping line is connected so that the exhaust gas discharged from the SCR reactor is recycled back to the SCR reactor through the bypass line, and the urea injection nozzle is installed in the pipeline, By performing urea hydrolysis without a urea hydrolysis chamber, the structure can be simplified.

또한 재순환되는 배기가스를 가열 장치로 주입되는 연소 공기와 열교환시켜 가열 장치의 연료 소모량을 최소화할 수 있게 된다.Also, the exhaust gas recirculated is heat-exchanged with the combustion air injected into the heating device, so that the fuel consumption of the heating device can be minimized.

또한 재순환 배관 라인 내의 온도를 우레아 가수분해에 적합한 온도로 조절할 수 있게 된다.In addition, the temperature in the recycle line can be adjusted to a temperature suitable for urea hydrolysis.

도 1은 본 발명의 일 실시예에 따른 SCR 시스템의 구성을 개략적으로 보인 도면이다.
도 2는 본 발명의 일 실시예에 따른 SCR 시스템 제어 방법을 설명하기 위한 처리도이다.FIG. 1 is a schematic view illustrating a configuration of an SCR system according to an embodiment of the present invention. Referring to FIG.
2 is a process chart for explaining a SCR system control method according to an embodiment of the present invention.

이하에서는 첨부한 도면을 참조하여 본 발명의 바람직한 실시예에 따른 SCR 시스템 및 그 제어 방법에 대해서 상세하게 설명한다.Hereinafter, an SCR system and a control method thereof according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명의 일 실시예에 따른 SCR 시스템의 구성을 개략적으로 보인 도면이다.FIG. 1 is a schematic view illustrating a configuration of an SCR system according to an embodiment of the present invention. Referring to FIG.

도 1에서 배기가스 리시버(15)는 엔진(10)에서 배출되는 배기가스를 받아 T/C(Turbo Charger)(20)로 공급한다. 1, an exhaust gas receiver 15 receives exhaust gas discharged from an engine 10 and supplies the exhaust gas to a turbocharger 20.

SCR 반응기(25)는 T/C(20)를 거쳐 나오는 배기가스 내의 유해 성분을 제거하는 SCR 촉매가 설치된다.The SCR reactor 25 is provided with an SCR catalyst for removing harmful components in the exhaust gas passing through the T / C 20. [

제1배기가스 라인(30)은 T/C(20)에서 배출되는 배기가스를 SCR 반응기(25)로 유도한다.The first exhaust gas line 30 leads the exhaust gas discharged from the T / C 20 to the SCR reactor 25.

제1배기 밸브(35)는 제1배기가스 라인(30)에 설치되며, 제어부(115)의 제어 하에 개폐된다.The first exhaust valve 35 is installed in the first exhaust gas line 30 and is opened and closed under the control of the control unit 115.

제2배기가스 라인(40)은 SCR 반응기(25) 후단에 설치되어 배기가스를 배출한다.The second exhaust gas line 40 is installed at the downstream end of the SCR reactor 25 to exhaust the exhaust gas.

제2배기 밸브(45)는 제2배기가스 라인(40)에 설치되며, 제어부(115)의 제어 하에 개폐된다.The second exhaust valve 45 is installed in the second exhaust gas line 40 and is opened and closed under the control of the control unit 115.

바이패스 라인(50)은 일단이 제1배기가스 라인(30)에 연결되고 타단이 제2배기가스 라인(40)에 연결되어, T/C(20)에서 배출되는 배기가스를 SCR 반응기(25)를 거치지 않고 바이패스시켜 배출시킨다.The bypass line 50 is connected to the first exhaust gas line 30 at one end and connected to the second exhaust gas line 40 at the other end so that the exhaust gas discharged from the T / C 20 is supplied to the SCR reactor 25 ) Without passing through.

전술한 바이패스 라인(50)은 일단이 제1배기가스 라인(30)에 연결되는 제1바이패스 라인(51) 및 일단이 제2배기가스 라인(40)에 연결되고, 타단이 제1바이패스 라인(51)의 타단과 연결되는 제2바이패스 라인(55)을 포함하여 이루어질 수 있다.The bypass line 50 includes a first bypass line 51 having one end connected to the first exhaust gas line 30 and one end connected to the second exhaust gas line 40, And a second bypass line 55 connected to the other end of the pass line 51.

바이패스 밸브(60)는 바이패스 라인(50)에 설치되며, 제어부(115)의 제어 하에 개폐된다.The bypass valve 60 is installed in the bypass line 50 and is opened and closed under the control of the control unit 115.

전술한 바이패스 밸브(60)는 제1바이패스 라인(51)에 설치되는 제1바이패스 밸브(61) 및 제2바이패스 라인(55)에 설치되는 제2바이패스 밸브(65)를 포함하여 이루어질 수 있다.Described bypass valve 60 includes a first bypass valve 61 provided in the first bypass line 51 and a second bypass valve 65 provided in the second bypass line 55 .

재순환 라인(70)은 일단이 제2배기가스 라인(40)에 연결되고 타단이 바이패스 라인(50)에 연결되어, SCR 반응기(25)에서 배출되는 배기가스를 바이패스 라인(50)을 통해 다시 SCR 반응기(25)로 재순환시킨다.The recirculation line 70 is connected at one end to the second exhaust gas line 40 and at the other end to the bypass line 50 so that the exhaust gas discharged from the SCR reactor 25 flows through the bypass line 50 And recycled back to the SCR reactor 25.

전술한 재순환 라인(70)은 일단이 제2배기가스 라인(40)에 연결되는 제1재순환 라인(71) 및 일단이 바이패스 라인(50)에 연결되고, 타단이 가열 장치(100)에 연결되며, 타단 측에 제1재순환 라인(71)의 타단이 연결되는 제2재순환 라인(75)을 포함하여 이루어질 수 있다.The recirculation line 70 is connected to a first recirculation line 71 having one end connected to the second exhaust gas line 40 and one end connected to the bypass line 50 and the other end connected to the heating device 100 And a second recirculation line 75 connecting the other end of the first recirculation line 71 to the other end.

재순환 밸브(80)는 재순환 라인(70)에 설치되며, 제어부(115)의 제어 하에 개폐된다.The recirculation valve 80 is installed in the recirculation line 70 and is opened and closed under the control of the control unit 115.

전술한 재순환 밸브(80)는 제1재순환 라인(71)에 설치되는 제1재순환 밸브(81) 및 제2재순환 라인(75)에 설치되는 제2재순환 밸브(85)를 포함하여 이루어질 수 있다.Described recirculation valve 80 may include a first recirculation valve 81 installed in the first recirculation line 71 and a second recirculation valve 85 installed in the second recirculation line 75.

재순환 블로워(90)는 제1재순환 라인(71)에 설치되며, 제어부(115)의 제어 하에 구동된다.The recycle blower 90 is installed in the first recycle line 71 and is driven under the control of the control unit 115.

가열 장치(100)는 제2재순환 라인(75)의 타단에 연결되어 있으며, 연소 공기 공급기(미도시)로부터 공급받은 연소 공기를 가열시켜 제2재순환 라인(75)에 주입하여, 제2재순환 라인(75)을 통해 SCR 반응기(25)로 재순환되는 배기가스를 가열시킨다.The heating device 100 is connected to the other end of the second recirculation line 75. The heating device 100 heats the combustion air supplied from the combustion air supplier (not shown) and injects it into the second recirculation line 75, (75) to the exhaust gas recirculated to the SCR reactor (25).

열교환 챔버(95)는 재순환 블로워(90)와 가열 장치(100) 사이에 설치되며, 가열 장치(100)로 공급되는 상온의 연소 공기를 SCR 반응기(25)에서 배출되는 배기가스(예를 들어, 250℃)와 열교환시켜 공급함으로써, 가열 장치(100)에서 사용되는 연소 연료를 절감시킬 수 있도록 한다.The heat exchange chamber 95 is provided between the recirculation blower 90 and the heating device 100 and supplies the combustion air at room temperature supplied to the heating device 100 to the exhaust gas discharged from the SCR reactor 25 250 deg. C), thereby reducing the amount of combustion fuel used in the heating apparatus 100.

열교환 챔버(95)에서 배기가스와 연소 공기간의 열교환이 이루어지므로, 열교환 챔버(95)를 통과한 후의 배기가스 온도는 열교환 챔버(95)를 통과하기 전보다 낮아지게 된다.The temperature of the exhaust gas after passing through the heat exchange chamber 95 becomes lower than that before the exhaust gas passes through the heat exchange chamber 95 since the heat exchange is performed between the exhaust gas and the combustion air in the heat exchange chamber 95.

이와 같이 온도가 낮아진 배기가스는 제2재순환 라인(75)으로 유입되고, 제2재순환 라인(75)으로 유입된 배기가스는 가열 장치(100)에서 배출되는 공기(대략 1,600℃~1,700℃)와 혼합되어 제2재순환 라인(75)을 통해 SCR 반응기(25)로 재순환되는 배기가스의 온도를 우레아 가수분해에 적당한 온도(예를 들어, 500℃~550℃)로 낮춘다.The exhaust gas whose temperature has been lowered as described above flows into the second recycle line 75 and the exhaust gas flowing into the second recycle line 75 flows through the air discharged from the heating device 100 (approximately 1,600 ° C to 1,700 ° C) The temperature of the exhaust gas mixed and recycled to the SCR reactor 25 through the second recycle line 75 is lowered to a temperature suitable for urea hydrolysis (for example, 500 ° C to 550 ° C).

온도 측정 수단(105)은 가열 장치(100)와 우레아 분사 장치(110) 사이에 설치되어 재순환되는 배기가스의 온도를 측정하고, 측정된 온도를 제어부(115)로 인가한다.The temperature measuring means 105 measures the temperature of exhaust gas recirculated between the heating device 100 and the urea injector 110 and applies the measured temperature to the control portion 115.

우레아 분사 장치(110)는 제2재순환 라인(75) 또는 제1바이패스 라인(51)에 설치되며, 재순환되는 배기가스에 우레아를 분사한다. 즉 제어부(115)의 제어 하에 제2재순환 라인(75) 또는 제1바이패스 라인(51) 내에 우레아를 분사한다.The urea injector 110 is installed in the second recycle line 75 or the first bypass line 51 and injects urea into the recirculated exhaust gas. That is, under the control of the control unit 115, the urea is injected into the second recirculation line 75 or the first bypass line 51.

제어부(115)는 SCR 반응기(25) 운전시, 제1, 2재순환 밸브(80) 및 제1바이패스 밸브(61)를 개방하고, 가열 장치(100) 및 우레아 분사 장치(110)를 구동시킨다.The control unit 115 opens the first and second recirculation valves 80 and the first bypass valve 61 and drives the heating device 100 and the urea injection device 110 during the operation of the SCR reactor 25 .

또한 온도 측정 수단(105)을 통해 측정된 온도에 의거하여 재순환 블로워(90)의 회전 속도를 제어한다.And also controls the rotational speed of the recirculation blower 90 based on the temperature measured by the temperature measuring means 105.

즉 온도 측정 수단(105)을 통해 측정된 온도가 우레아 가수분해 적정 온도 최대 임계값 이상이면, 재순환 블로워(90)의 회전 속도를 높여 재순환 라인(70)으로 유입되는 배기가스량을 늘림으로써, SCR 반응기(25)로 재순환되는 배기가스의 온도를 낮춰 우레아 가수분해에 적당한 온도(예를 들어, 500℃~550℃)가 되도록 한다.That is, if the temperature measured by the temperature measuring means 105 is equal to or higher than the urea hydrolysis proper temperature maximum threshold value, by increasing the rotation speed of the recycle blower 90 and increasing the amount of exhaust gas flowing into the recycle line 70, (For example, 500 ° C to 550 ° C) suitable for urea hydrolysis by lowering the temperature of the exhaust gas recirculated to the exhaust gas recirculation pipe 25.

그리고 온도 측정 수단(105)을 통해 측정된 온도가 우레아 가수분해 적정 온도 최소 임계값 이하이면, 재순환 블로워(90)의 회전 속도를 낮춰 재순환 라인(70)으로 유입되는 배기가스량을 줄임으로써, SCR 반응기(25)로 재순환되는 배기가스의 온도를 높여 우레아 가수분해에 적당한 온도(예를 들어, 500℃~550℃)가 되도록 한다.If the temperature measured by the temperature measuring means 105 is lower than the urea hydrolysis proper temperature minimum threshold value, the rotation speed of the recycle blower 90 is lowered to reduce the amount of exhaust gas flowing into the recycle line 70, (For example, 500 ° C to 550 ° C) suitable for urea hydrolysis by raising the temperature of the exhaust gas recirculated to the exhaust gas recirculation pipe 25.

도 2는 본 발명의 일 실시예에 따른 SCR 시스템 제어 방법을 설명하기 위한 처리도이다.2 is a process chart for explaining a SCR system control method according to an embodiment of the present invention.

우선 제어부(115)는 SCR 반응기(25) 운전 여부에 따라 SCR 반응기(25) 운전시에는 제1배기 밸브(35), 제2배기 밸브(45)는 개방하고, 제2바이패스 밸브(65)는 폐쇄하여 T/C(20)에서 배출되는 배기가스가 SCR 반응기(25)를 거친 후 배출되도록 한다(S10, S12).The control unit 115 opens the first exhaust valve 35 and the second exhaust valve 45 while the second bypass valve 65 is closed during the operation of the SCR reactor 25 depending on whether the SCR reactor 25 is operated, So that the exhaust gas discharged from the T / C 20 is exhausted after passing through the SCR reactor 25 (S10, S12).

그리고 제어부(115)는 제1, 2재순환 밸브(80:81, 85), 제1바이패스 밸브(61)를 개방하여, SCR 반응기(25)에서 배출되는 배기가스가 다시 SCR 반응기(25)로 유입되도록 재순환시킨다(S14).The control unit 115 opens the first and second recirculation valves 80 and 81 and the first bypass valve 61 so that the exhaust gas discharged from the SCR reactor 25 is returned to the SCR reactor 25 (S14).

상기한 과정 S14를 통해 제1, 2재순환 밸브(80:81, 85), 제1바이패스 밸브(61)를 개방할 때, 제어부(115)는 재순환 블로워(90), 가열 장치(100), 우레아 분사 장치(110)를 구동시키는 것이 바람직하다.The control unit 115 controls the recirculation blower 90, the heating device 100, and the second bypass valve 61 when the first and second recirculation valves 80, 81, 85 and the first bypass valve 61 are opened through the above- It is preferable to drive the urea injection device 110. [

이후 제어부(115)는 온도 측정 수단(105)을 통해 재순환되는 배기가스의 온도를 측정하고(S16), 측정된 온도에 의거하여 재순환 블로워(90)의 회전 속도를 제어한다.Thereafter, the control unit 115 measures the temperature of the exhaust gas recirculated through the temperature measuring unit 105 (S16), and controls the rotation speed of the recycle blower 90 based on the measured temperature.

즉 측정된 온도가 우레아 가수분해 적정 온도 최대 임계값 이상이면, 재순환 블로워(90)의 회전 속도를 높여 재순환 라인(70)으로 유입되는 배기가스량을 늘림으로써, SCR 반응기(25)로 재순환되는 배기가스의 온도가 우레아 가수분해에 적당한 온도(예를 들어, 500℃~550℃)로 낮아지도록 한다(S18, S20).The amount of exhaust gas flowing into the recycle line 70 is increased by increasing the rotation speed of the recycle blower 90 so that the amount of exhaust gas recirculated to the SCR reactor 25 is increased (For example, 500 ° C to 550 ° C) suitable for urea hydrolysis (S18, S20).

그리고 측정된 온도가 우레아 가수분해 적정 온도 최소 임계값 이하이면, 재순환 블로워(90)의 회전 속도를 낮춰 재순환 라인(70)으로 유입되는 배기가스량을 줄임으로써, SCR 반응기(25)로 재순환되는 배기가스의 온도가 우레아 가수분해에 적당한 온도(예를 들어, 500℃~550℃)로 높아지도록 한다(S22, S24).When the measured temperature is lower than the urea hydrolysis proper temperature minimum threshold, the exhaust gas recirculated to the SCR reactor 25 is reduced by reducing the rotational speed of the recycle blower 90 and reducing the amount of exhaust gas flowing into the recycle line 70 (For example, 500 ° C to 550 ° C) suitable for urea hydrolysis (S22, S24).

한편 제어부(115)는 SCR 반응기(25) 비운전시에는 제1배기 밸브(35), 제2배기 밸브(45)는 폐쇄하고, 제1, 2바이패스 밸브(60:61, 65)는 개방하여 T/C(20)에서 배출되는 배기가스가 SCR 반응기(25)를 거치지 않고 바로 배출되도록 한다(S26).On the other hand, the control unit 115 closes the first exhaust valve 35 and the second exhaust valve 45 and releases the first and second bypass valves 60, 61 and 65 when the SCR reactor 25 is not emptied The exhaust gas discharged from the T / C 20 is discharged immediately without passing through the SCR reactor 25 (S26).

그리고 제1, 2재순환 밸브(80:81, 85)는 폐쇄하여 SCR 반응기(25)에서 배출되는 배기가스가 다시 SCR 반응기(25)로 재순환되지 않도록 차단한다(S28).The first and second recirculation valves 80, 81 and 85 are closed to block the exhaust gas discharged from the SCR reactor 25 from being recirculated back to the SCR reactor 25 (S28).

상기한 과정 S28을 통해 제1, 2재순환 밸브(80:81, 85)를 폐쇄할 때, 제어부(115)는 재순환 블로워(90), 가열 장치(100), 우레아 분사 장치(110)의 구동도 정지시키는 것이 바람직하다.When the first and second recirculation valves 80, 81 and 85 are closed through the above-described process S28, the control unit 115 controls the operation of the recycle blower 90, the heating device 100, and the urea injector 110 It is preferable to stop the operation.

본 발명의 SCR 시스템 및 그 제어 방법은 전술한 실시예에 국한되지 않고 본 발명의 기술 사상이 허용하는 범위 내에서 다양하게 변형하여 실시할 수 있다.The SCR system and the control method thereof according to the present invention are not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea of the present invention.

10. 엔진, 15. 배기가스 리시버,
20. T/C, 25. SCR 반응기,
30. 제1배기가스 라인, 35. 제1배기 밸브,
40. 제2배기가스 라인, 45. 제2배기 밸브,
50. 바이패스 라인, 51. 제1바이패스 라인,
55. 제2바이패스 라인, 60. 바이패스 밸브,
61. 제1바이패스 밸브, 65. 제2바이패스 밸브,
70. 재순환 라인, 71. 제1재순환 라인,
75. 제2재순환 라인, 80. 재순환 밸브,
81. 제1재순환 밸브, 85. 제2재순환 밸브,
90. 재순환 블로워, 95. 열교환 챔버,
100. 가열 장치, 105. 온도 측정 수단,
110. 우레아 분사 장치, 115. 제어부10. Engine, 15. Exhaust gas receiver,
20. T / C, 25. SCR reactor,
30. A first exhaust line, 35. A first exhaust valve,
40. Second exhaust line, 45. Second exhaust valve,
50. Bypass line, 51. First bypass line,
55. Second bypass line, 60. Bypass valve,
61. A first bypass valve, 65. A second bypass valve,
70. Recirculation line, 71. First recirculation line,
75. Second recirculation line, 80. Recirculation valve,
81. First recirculation valve, 85. Second recirculation valve,
90. Recirculation blower, 95. Heat exchange chamber,
100. Heating device, 105. Temperature measuring means,
110. Urethane spraying apparatus, 115. Control unit

Claims (10)

T/C(Turbo Charger)를 거쳐 나오는 배기가스 내의 유해 성분을 제거하는 SCR 촉매가 설치된 SCR 반응기;
상기 T/C에서 배출되는 배기가스를 상기 SCR 반응기로 유도하는 제1배기가스 라인;
상기 SCR 반응기 후단에 설치되어 배기가스를 배출하는 제2배기가스 라인;
일단이 상기 제1배기가스 라인에 연결되고 타단이 상기 제2배기가스 라인에 연결되는 바이패스 라인;
일단이 상기 제2배기가스 라인에 연결되고 타단이 상기 바이패스 라인에 연결되는 재순환 라인;
상기 재순환 라인으로 유입된 배기가스를 가열시키는 가열 장치;
상기 재순환되는 배기가스에 우레아를 분사하는 우레아 분사 장치; 및
상기 재순환 라인과 상기 바이패스 라인을 통해 상기 SCR 반응기에서 배출되는 배기가스를 다시 상기 SCR 반응기로 재순환시키고, 상기 가열 장치 및 우레아 분사 장치를 구동시키는 제어부;를 포함하여 이루어지는 SCR 시스템.An SCR reactor provided with an SCR catalyst for removing harmful components in the exhaust gas passing through a T / C (Turbo Charger);
A first exhaust gas line for leading the exhaust gas discharged from the T / C to the SCR reactor;
A second exhaust gas line disposed downstream of the SCR reactor for discharging exhaust gas;
A bypass line having one end connected to the first exhaust gas line and the other end connected to the second exhaust gas line;
A recirculation line having one end connected to the second exhaust gas line and the other end connected to the bypass line;
A heating device for heating the exhaust gas flowing into the recycle line;
A urea injection device for injecting urea into the recirculated exhaust gas; And
And a control unit for recirculating the exhaust gas discharged from the SCR reactor to the SCR reactor through the recirculation line and the bypass line to drive the heating device and the urea injection device. 제 1항에 있어서,
상기 SCR 반응기에서 배출되는 배기가스의 열로 상기 가열 장치로 유입되는 연소 공기를 가열시키는 열교환 챔버;를 더 포함하여 이루어지는 것을 특징으로 하는 SCR 시스템.The method according to claim 1,
And a heat exchange chamber for heating the combustion air flowing into the heating device by heat of the exhaust gas discharged from the SCR reactor. 제 1항 또는 제 2항에 있어서,
상기 재순환 라인에 설치되는 재순환 블로워; 및
상기 가열 장치와 상기 우레아 분사 장치 사이에 설치되어 재순환되는 배기가스의 온도를 측정하는 온도 측정 수단;을 더 포함하며,
상기 제어부는, 상기 온도 측정 수단을 통해 측정된 온도에 의거하여 상기 재순환 블로워의 회전 속도를 제어하는 것을 특징으로 하는 SCR 시스템.3. The method according to claim 1 or 2,
A recycle blower installed in the recycle line; And
And a temperature measuring means installed between the heating device and the urea injection device for measuring the temperature of the exhaust gas recirculated,
Wherein the control unit controls the rotation speed of the recirculation blower based on the temperature measured through the temperature measurement unit. 제 3항에 있어서,
상기 제어부는,
상기 온도 측정 수단을 통해 측정된 온도가 우레아 가수분해 적정 온도 최대 임계값 이상이면, 상기 재순환 블로워의 회전 속도를 높이고, 상기 온도 측정 수단을 통해 측정된 온도가 우레아 가수분해 적정 온도 최소 임계값 이하이면, 상기 재순환 블로워의 회전 속도를 낮추는 것을 특징으로 하는 SCR 시스템.The method of claim 3,
Wherein,
If the temperature measured by the temperature measuring means is higher than or equal to the urea hydrolysis proper temperature maximum threshold value, the rotation speed of the recycle blower is increased. If the temperature measured by the temperature measuring means is below the urea hydrolysis proper temperature minimum threshold value , And reduces the rotational speed of the recirculation blower. 제 3항에 있어서,
상기 바이패스 라인은,
일단이 상기 제1배기가스 라인에 연결되는 제1바이패스 라인; 및
일단이 상기 제2배기가스 라인에 연결되고, 타단이 상기 제1바이패스 라인의 타단과 연결되는 제2바이패스 라인;을 포함하고,
상기 재순환 라인은,
일단이 상기 제2배기가스 라인에 연결되는 제1재순환 라인; 및
일단이 상기 바이패스 라인에 연결되고, 타단이 상기 가열 장치에 연결되며, 타단 측에 상기 제1재순환 라인의 타단이 연결되는 제2재순환 라인;을 포함하며,
열교환 챔버와 재순환 블로워는 상기 제1재순환 라인에 설치되고, 우레아 분사 장치 및 온도 측정 수단은 상기 제2재순환 라인 또는 상기 제1바이패스 라인에 설치되는 것을 특징으로 하는 SCR 시스템.The method of claim 3,
The bypass line includes:
A first bypass line, one end of which is connected to the first exhaust gas line; And
And a second bypass line having one end connected to the second exhaust gas line and the other end connected to the other end of the first bypass line,
Wherein the recycle line comprises:
A first recirculation line having one end connected to the second exhaust gas line; And
And a second recirculation line having one end connected to the bypass line, the other end connected to the heating device, and the other end connected to the other end of the first recirculation line,
Wherein the heat exchange chamber and the recycle blower are installed in the first recycle line and the urea injection device and the temperature measurement means are installed in the second recycle line or the first bypass line. 운전 여부를 판단하는 운전 여부 판단 과정; 및
상기 운전 여부 판단결과 운전중이면, T/C에서 배출되는 배기가스가 SCR 반응기를 거쳐 배출되도록 하되, 상기 SCR 반응기에서 배출되는 배기가스를 재순환 라인 및 바이패스 라인을 통해 다시 상기 SCR 반응기로 재순환시키는 과정;을 포함하여 이루어지는 SCR 시스템 제어 방법.Determining whether the vehicle is driven or not; And
The exhaust gas discharged from the SCR reactor is recycled to the SCR reactor through the recycle line and the bypass line so that the exhaust gas discharged from the T / C is discharged through the SCR reactor A method for controlling an SCR system, comprising: 제 6항에 있어서,
상기 SCR 반응기에서 배출되는 배기가스를 상기 재순환 라인 및 상기 바이패스 라인을 통해 다시 상기 SCR 반응기로 재순환시킬 때, 상기 재순환 라인에 설치되는 재순환 블로어를 함께 구동시키는 것을 특징으로 하는 SCR 시스템 제어 방법.The method according to claim 6,
Wherein the recirculation blower installed in the recycle line is driven together when the exhaust gas discharged from the SCR reactor is recycled to the SCR reactor through the recycle line and the bypass line. 제 6항에 있어서,
온도 측정 수단을 통해 측정된 온도에 의거하여 재순환 블로워의 회전 속도를 제어하는 과정;을 더 포함하여 이루어지는 것을 특징으로 하는 SCR 시스템 제어 방법.The method according to claim 6,
And controlling the rotational speed of the recirculation blower based on the temperature measured by the temperature measuring means. 제 8항에 있어서,
상기 재순환 블로워의 회전 속도를 제어하는 과정은,
온도 측정 수단을 통해 재순환되는 배기가스의 온도를 측정하는 과정;
상기 측정된 온도가 우레아 가수분해 적정 온도 최대 임계값 이상이면, 상기 재순환 블로워의 회전 속도를 높이는 과정; 및
상기 측정된 온도가 우레아 가수분해 적정 온도 최소 임계값 이하이면, 상기 재순환 블로워의 회전 속도를 낮추는 과정;을 포함하여 이루어지는 것을 특징으로 하는 SCR 시스템 제어 방법.9. The method of claim 8,
The process of controlling the rotation speed of the recirculation blower includes:
Measuring the temperature of the exhaust gas recirculated through the temperature measuring means;
Increasing the rotational speed of the recycle blower if the measured temperature is greater than or equal to a urea hydrolysis proper temperature maximum threshold; And
And lowering the rotation speed of the recirculation blower when the measured temperature is below the urea hydrolysis proper temperature minimum threshold value. 제 6항에 있어서,
상기 운전 여부 판단결과 비운전중이면, 상기 바이패스 라인을 통해, 상기 T/C에서 배출되는 배기가스가 상기 SCR 반응기를 거치지 않고 배출되도록 하되, 상기 재순환 라인을 통해, 상기 SCR 반응기에서 배출되는 배기가스가 다시 상기 SCR 반응기로 재순환되지 않도록 차단하는 과정;을 더 포함하여 이루어지는 SCR 시스템 제어 방법.The method according to claim 6,
The exhaust gas discharged from the T / C is discharged without passing through the SCR reactor through the bypass line when the operation is determined to be non-operating, and the exhaust gas discharged from the SCR reactor through the recycle line And blocking the gas from being recirculated back to the SCR reactor.
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