KR102204687B1 - Scr system and control method thereof - Google Patents

Scr system and control method thereof Download PDF

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KR102204687B1
KR102204687B1 KR1020150086418A KR20150086418A KR102204687B1 KR 102204687 B1 KR102204687 B1 KR 102204687B1 KR 1020150086418 A KR1020150086418 A KR 1020150086418A KR 20150086418 A KR20150086418 A KR 20150086418A KR 102204687 B1 KR102204687 B1 KR 102204687B1
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exhaust gas
line
scr reactor
recirculation
scr
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KR20160110001A (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
    • 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

본 발명은 SCR 반응기에서 배출되는 배기가스를 재순환하여 우레아 가수분해에 이용할 수 있도록 하는 SCR 시스템 및 그 제어 방법에 관한 것이다.
이를 위해, 본 발명은 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.
이에 따라, 본 발명은 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.The present invention relates to an SCR system and a control method for recirculating exhaust gas discharged from an SCR reactor to be used for urea hydrolysis.
To this end, the present invention is a SCR reactor installed with an SCR catalyst for removing harmful components in the exhaust gas through a T/C (Turbo Charger); A first exhaust gas line for guiding the exhaust gas discharged from the T/C to the SCR reactor; A second exhaust gas line installed at the rear end of the SCR reactor to discharge 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 recycling 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 exhaust gas introduced into the recirculation line; A urea injection device for injecting urea into the recycled exhaust gas; And a control unit for recirculating exhaust gas discharged from the SCR reactor through the recirculation line and the bypass line back to the SCR reactor, and driving the heating device and the urea injection device.
Accordingly, the present invention connects the piping line so that the exhaust gas discharged from the SCR reactor is recirculated back to the SCR reactor through the bypass line, and installs a urea injection nozzle in this piping line, so that urea without a separate urea hydrolysis chamber By allowing hydrolysis to be carried out, the structure can be simplified.

Description

SCR 시스템 및 그 제어 방법{SCR SYSTEM AND CONTROL METHOD THEREOF}SCR system and its control method {SCR SYSTEM AND CONTROL METHOD THEREOF}

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 method for controlling the same, and more particularly, to an SCR system and a control method for recirculating exhaust gas discharged from the SCR reactor to be 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.In general, a main engine that drives a propeller to propel a ship and an auxiliary engine, which is an auxiliary power system for supplying power to various equipment or equipment mounted on the ship, are installed and operated in a ship.

이러한 선박 엔진에서 연소 후 배출되는 배기가스에는 다수의 부유성 미립자와 질소 산화물인 NOx, 황산화물인 SOx 등의 유해성 물질이 포함되어 있다.Exhaust gas emitted after combustion from such a ship engine contains a number of suspended particulates and harmful substances such as NOx as nitrogen oxide and SOx as sulfur oxide.

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 equipped with a diesel particulate filter (DPF), a selective catalytic reduction device (SCR), a scrubber (SOx removal), etc. 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 oxides (NOx) in exhaust gas into water and nitrogen that are harmless to the human body through a chemical reaction with reducing agents such as ammonia (NH3) and urea in the catalyst layer, and then discharges them. 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 composed of a porous catalyst filter on which extrusion or metallic coating is formed, and one or two are continuously installed in the SCR reactor installed in the exhaust line 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.Existing SCR systems for large engines require a high temperature of 250°C or higher depending on the sulfur content in the fuel to prevent ABS (Ammonium Bisulfate: NH4HSO4) formation, decomposition and NOx removal, and increase the exhaust gas temperature through engine tuning or exhaust. It is installed in front of the engine T/C (Turbo Charger) where the gas temperature is 250~500℃.

이와 같이 SCR 시스템이 T/C 전단에 설치되는 경우 SCR 시스템으로 유입되는 배기가스의 압력이 높기 때문에 고압 SCR 시스템이라 불린다.In this way, when the SCR system is installed in 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, if 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.In order to solve this problem, the exhaust gas temperature is 150~300℃, and the SCR system can be installed at the rear end of the T/C, which is at the atmospheric pressure level.

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.If the SCR system is installed at the rear end of the T/C, it is possible to install the SCR system outside the engine room, so that the SCR system can be freely arranged without space restrictions.

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 rear end of the T/C, it is difficult to secure NOx removal performance due to the low temperature of the exhaust gas, and problems such as ABS decomposition and removal and stable reducing agent decomposition and supply may 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, when the SCR system removes nitrogen oxides (NOx) in the exhaust gas, the ABS produced becomes a gaseous state above a certain temperature (for example, 340 degrees Celsius), but becomes a liquid state below a certain temperature and adheres to the SCR catalyst. As a result, there is a problem in that the performance of the SCR catalyst is deteriorated by covering the active point on the surface of the SCR catalyst.

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.And when the SCR system is installed in front of the T/C, the temperature of the exhaust gas flowing into the SCR system is at least 330°C or higher, so there is no big problem in decomposing the reducing agent. However, if the SCR system is installed at the rear of the T/C, the temperature of the exhaust gas flowing into the SCR system is lowered to 250℃, so the engine is tuned to raise the temperature of the exhaust gas to 280~350℃, or to decompose the urea solution as a reducing agent. A separate device, ie a urea hydrolysis device, is required.

한국공개특허공보 제10-2014-0000556호(공개일 2014.01.03.)Korean Patent Publication No. 10-2014-0000556 (published on 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 was conceived to solve the above-described problem, by connecting a piping line so that the exhaust gas discharged from the SCR reactor is recirculated back to the SCR reactor through a bypass line, and installing a urea injection nozzle in the piping line, An object thereof is to provide 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 fuel consumption of the heating device by exchanging the recirculated exhaust gas with combustion air injected into the heating device.

본 발명의 또 다른 목적은 재순환 배관 라인 내의 온도를 우레아 가수분해에 적합한 온도로 조절할 수 있도록 함에 있다.Another object of the present invention is to be able to adjust the temperature in the recirculation piping line 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.The SCR system according to an embodiment of the present invention for achieving the above object includes: an SCR reactor installed with an SCR catalyst for removing harmful components in exhaust gas from T/C (Turbo Charger); A first exhaust gas line for guiding the exhaust gas discharged from the T/C to the SCR reactor; A second exhaust gas line installed at a rear end of the SCR reactor to discharge 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 recycle 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 introduced into the recirculation line; A urea injection device for injecting urea into the recycled exhaust gas; And a control unit for recirculating exhaust gas discharged from the SCR reactor through the recirculation line and the bypass line back to the SCR reactor, and driving the heating device and the urea injection device.

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.On the other hand, the SCR system control method according to an embodiment of the present invention includes an operation determination process of determining whether to operate; And when the operation is in operation, the exhaust gas discharged from the T/C is discharged through the SCR reactor, and the exhaust gas discharged from the SCR reactor is recirculated to the SCR reactor through a recirculation line and a bypass line. It is preferable to include;

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 its control method of the present invention, a piping line is connected so that exhaust gas discharged from the SCR reactor is recirculated back to the SCR reactor through a bypass line, and a urea injection nozzle is installed in the piping line. By allowing urea hydrolysis to be performed without a urea hydrolysis chamber, it is possible to simplify the structure.

또한 재순환되는 배기가스를 가열 장치로 주입되는 연소 공기와 열교환시켜 가열 장치의 연료 소모량을 최소화할 수 있게 된다.In addition, it is possible to minimize the fuel consumption of the heating device by exchanging the recirculated exhaust gas with combustion air injected into the heating device.

또한 재순환 배관 라인 내의 온도를 우레아 가수분해에 적합한 온도로 조절할 수 있게 된다.In addition, the temperature in the recirculation piping 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.1 is a view schematically showing the configuration of an SCR system according to an embodiment of the present invention.
2 is a processing diagram for explaining an 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.1 is a view schematically showing the configuration of an SCR system according to an embodiment of the present invention.

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

SCR 반응기(25)는 T/C(20)를 거쳐 나오는 배기가스 내의 유해 성분을 제거하는 SCR 촉매가 설치된다.The SCR reactor 25 is installed with an SCR catalyst that removes harmful components in the exhaust gas emitted 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 guides 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 controller 115.

제2배기가스 라인(40)은 SCR 반응기(25) 후단에 설치되어 배기가스를 배출한다.The second exhaust gas line 40 is installed at the rear end of the SCR reactor 25 to discharge 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 controller 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 has one end connected to the first exhaust gas line 30 and the other end connected to the second exhaust gas line 40, so that the exhaust gas discharged from the T/C 20 is transferred to the SCR reactor 25 ), bypass and discharge.

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 above-described bypass line 50 has 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 the other end A second bypass line 55 connected to the other end of the pass line 51 may be included.

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 controller 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.The above-described bypass valve 60 includes a first bypass valve 61 installed on the first bypass line 51 and a second bypass valve 65 installed on the second bypass line 55 It can be done by doing.

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 has one end connected to the second exhaust gas line 40 and the other end connected to the bypass line 50, so that the exhaust gas discharged from the SCR reactor 25 is passed through the bypass line 50. It is 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 above-described recirculation line 70 has one end connected to the first recirculation line 71 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 recycle line 75 to which the other end of the first recycle line 71 is connected 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 controller 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.The above-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 recirculation blower 90 is installed in the first recirculation line 71 and is driven under the control of the controller 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, and heats the combustion air supplied from the combustion air supply (not shown) and injects it into the second recirculation line 75, and the second recirculation line The exhaust gas recycled to the SCR reactor 25 is heated through 75.

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 installed between the recirculation blower 90 and the heating device 100, and exhaust gas discharged from the SCR reactor 25 at room temperature combustion air supplied to the heating device 100 (for example, 250° C.) and supply by heat exchange, thereby reducing combustion fuel used in the heating device 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.Since heat exchange between the exhaust gas and the combustion air is performed in the heat exchange chamber 95, the temperature of the exhaust gas after passing through the heat exchange chamber 95 is lower than before passing through 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 is introduced into the second recirculation line 75, and the exhaust gas introduced into the second recirculation line 75 is discharged from the heating device 100 (approximately 1,600°C to 1,700°C) and 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 is installed between the heating device 100 and the urea injection device 110 to measure the temperature of the exhaust gas that is recycled, and applies the measured temperature to the control unit 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 injection device 110 is installed in the second recycle line 75 or the first bypass line 51 and injects urea into the recycled exhaust gas. That is, urea is injected into the second recycle line 75 or the first bypass line 51 under the control of the controller 115.

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.When operating the SCR reactor 25, 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. .

또한 온도 측정 수단(105)을 통해 측정된 온도에 의거하여 재순환 블로워(90)의 회전 속도를 제어한다.In addition, the rotational speed of the recirculation blower 90 is controlled based on the temperature measured through 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 through the temperature measuring means 105 is higher than the maximum threshold for the appropriate urea hydrolysis temperature, the amount of exhaust gas flowing into the recirculation line 70 is increased by increasing the rotation speed of the recirculation blower 90 Lower the temperature of the exhaust gas to be recycled to (25) so that the temperature is suitable for hydrolysis of urea (for example, 500℃~550℃).

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.And if the temperature measured through the temperature measuring means 105 is less than the minimum threshold for the appropriate urea hydrolysis temperature, the amount of exhaust gas flowing into the recirculation line 70 is reduced by lowering the rotation speed of the recirculation blower 90 Increase the temperature of the exhaust gas to be recycled to (25) so that the temperature is suitable for hydrolysis of urea (for example, 500℃~550℃).

도 2는 본 발명의 일 실시예에 따른 SCR 시스템 제어 방법을 설명하기 위한 처리도이다.2 is a processing diagram for explaining an 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).First, the controller 115 opens the first exhaust valve 35 and the second exhaust valve 45 when operating the SCR reactor 25 depending on whether the SCR reactor 25 is operated, and the second bypass valve 65 Is closed so that the exhaust gas discharged from the T/C 20 is discharged 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).And the control unit 115 opens the first and second recirculation valves 80:81, 85 and the first bypass valve 61, so that the exhaust gas discharged from the SCR reactor 25 is returned to the SCR reactor 25. It is recycled to be introduced (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.When opening the first and second recirculation valves 80:81 and 85 and the first bypass valve 61 through the above-described process S14, the control unit 115 is the recirculation blower 90, the heating device 100, 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 recycled through the temperature measuring means 105 (S16), and controls the rotation speed of the recirculation 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).That is, when the measured temperature is more than the maximum critical value for the appropriate temperature for urea hydrolysis, the amount of exhaust gas flowing into the recirculation line 70 is increased by increasing the rotation speed of the recirculation blower 90, thereby recirculating the exhaust gas to the SCR reactor 25. The temperature of urea is lowered to a suitable temperature for hydrolysis of urea (for example, 500℃~550℃) (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).And if the measured temperature is less than the minimum threshold for the appropriate urea hydrolysis temperature, the exhaust gas recycled to the SCR reactor 25 is reduced by lowering the rotation speed of the recirculation blower 90 to reduce the amount of exhaust gas flowing into the recirculation line 70. The temperature of the urea is raised to a suitable temperature (for example, 500 ℃ ~ 550 ℃) 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).Meanwhile, when the SCR reactor 25 is not operated, the control unit 115 closes the first exhaust valve 35 and the second exhaust valve 45, and opens the first and second bypass valves 60:61, 65. The exhaust gas discharged from the T/C 20 is directly discharged 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).In addition, the first and second recirculation valves 80:81 and 85 are closed so that the exhaust gas discharged from the SCR reactor 25 is not recirculated to the SCR reactor 25 again (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 closing the first and second recirculation valves 80:81, 85 through the above-described process S28, the control unit 115 also operates the recirculation blower 90, the heating device 100, and the urea injection device 110. It is desirable to stop.

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 its control method of the present invention are not limited to the above-described embodiments, and can be implemented with various modifications within the range allowed by 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. 1st exhaust gas line, 35. 1st exhaust valve,
40. 2nd exhaust gas line, 45. 2nd exhaust valve,
50. Bypass line, 51. First bypass line,
55. second bypass line, 60. bypass valve,
61. The first bypass valve, 65. The 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. Urea injection device, 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.SCR reactor installed with an SCR catalyst that removes harmful components in exhaust gas from T/C (Turbo Charger);
A first exhaust gas line for guiding the exhaust gas discharged from the T/C to the SCR reactor;
A second exhaust gas line installed at the rear end of the SCR reactor to discharge 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 recycle 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 exhaust gas introduced into the recirculation line;
A urea injection device for injecting urea into the recycled exhaust gas; And
SCR system comprising; a control unit for recirculating the exhaust gas discharged from the SCR reactor through the recirculation line and the bypass line back to the SCR reactor, and driving 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 of claim 1,
SCR system comprising: a heat exchange chamber for heating the combustion air introduced into the heating device with 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.The method according to claim 1 or 2,
A recirculation blower installed in the recirculation line; And
Temperature measuring means installed between the heating device and the urea injection device to measure the temperature of the exhaust gas to be recycled; further includes,
The controller is an SCR system, characterized in that to control the rotation speed of the recirculation blower based on the temperature measured by the temperature measuring means. 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,
The control unit,
If the temperature measured through the temperature measuring means is equal to or higher than the urea hydrolysis appropriate temperature maximum threshold, the rotation speed of the recycle blower is increased, and if the temperature measured through the temperature measuring means is less than or equal to the urea hydrolysis optimum temperature minimum threshold , SCR system, characterized in that lowering the rotation 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,
A first bypass line having one end connected to the first exhaust gas line; 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; and
The recirculation line,
A first recycling line having one end connected to the second exhaust gas line; And
And a second recycle line having one end connected to the bypass line, the other end connected to the heating device, and the other end of the first recycling line connected to the other end, and
A heat exchange chamber and a recirculation blower are installed in the first recirculation line, and a urea injection device and a temperature measuring means are installed in the second recirculation line or the first bypass line. SCR 반응기 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 이루어지며,
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.An operation determination process of determining whether the SCR reactor is operating; And
As a result of determining whether the operation is running, the exhaust gas discharged from the T/C is discharged through the SCR reactor, but the exhaust gas discharged from the SCR reactor is recirculated back to the SCR reactor through a recirculation line and a bypass line. Process; including,
As a result of determining whether the operation is non-operating, the exhaust gas discharged from the T/C is discharged through the bypass line without passing through the SCR reactor, but the exhaust gas discharged from the SCR reactor through the recirculation line The process of blocking the gas from being recycled back to the SCR reactor; SCR system control method further 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 블로워를 함께 구동시키는 것을 특징으로 하는 SCR 시스템 제어 방법.The method of claim 6,
When the exhaust gas discharged from the SCR reactor is recirculated back to the SCR reactor through the recirculation line and the bypass line, a recirculation blower installed in the recirculation line is driven together. 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 of claim 6,
Controlling the rotational speed of the recirculation blower based on the temperature measured through the temperature measuring means; SCR system control method comprising a further comprising. 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.The method of claim 8,
The process of controlling the rotational speed of the recirculation blower,
Measuring the temperature of the exhaust gas recycled through the temperature measuring means;
If the measured temperature is greater than or equal to a maximum critical value for an appropriate urea hydrolysis temperature, increasing the rotation speed of the recirculation blower; And
If the measured temperature is less than the minimum threshold value for the appropriate urea hydrolysis temperature, the process of lowering the rotation speed of the recycle blower; SCR system control method comprising a. 삭제delete
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