KR20170013687A - Scr system - Google Patents

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KR20170013687A
KR20170013687A KR1020150106711A KR20150106711A KR20170013687A KR 20170013687 A KR20170013687 A KR 20170013687A KR 1020150106711 A KR1020150106711 A KR 1020150106711A KR 20150106711 A KR20150106711 A KR 20150106711A KR 20170013687 A KR20170013687 A KR 20170013687A
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South Korea
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urea
exhaust gas
scr
supply line
aqueous solution
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KR1020150106711A
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Korean (ko)
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민병수
정몽규
장광필
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현대중공업 주식회사
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Publication of KR20170013687A publication Critical patent/KR20170013687A/en

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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
    • 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
    • F01N2240/25—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 an ammonia generator
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • 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
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/02—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for marine vessels or naval applications
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/148—Arrangement of sensors
    • 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—

Abstract

The present invention relates to an SCR system capable of converting urea (CO(NH_2)_2) into ammonium carbamate (NH_4CO_2NH_2) by heating the urea over a predetermined temperature and spraying the ammonium carbamate. The SCR system comprises: an SCR reactor having an SCR catalyst to remove harmful components in an exhaust gas; an exhaust gas line introducing the exhaust gas in an engine to the SCR reactor; a urea supply line introducing the urea solution stored in the urea storage tank to the exhaust gas line; a heating device heating the urea solution introduced into the exhaust gas line through the urea supply line; and a spray nozzle spraying, to the SCR reactor, the ammonium carbamate (NH_4CO_2NH_2) converted from the urea solution heated by the heating device by a chemical reaction in the urea supply line. As such, the SCR system prevents generation of HNCO by heating the urea solution over a predetermined temperature, converting the urea solution into ammonium carbamate, and spraying the ammonium carbamate to the exhaust gas introduced into the SCR reactor; thereby increasing performance of the SCR catalyst and extending the service life of the SCR system.

Description

SCR 시스템{SCR SYSTEM}SCR system {SCR SYSTEM}

본 발명은 SCR 시스템에 관한 것으로서, 특히 우레아(CO(NH2)2)를 일정 온도 이상으로 가열하여 카르밤산암모늄(Ammonium Carbamate:NH4CO2NH2)으로 변환시킨 후, 분사할 수 있도록 하는 SCR 시스템에 관한 것이다.The present invention relates to an SCR system, and more particularly, to an SCR system in which urea (CO (NH 2 ) 2 ) is heated to a certain temperature or higher to convert it into ammonia carbamate (NH 4 CO 2 NH 2 ) SCR system.

일반적으로 선박에는 선박을 추진시키기 위해 프로펠러를 구동하는 메인 엔진과 선박에 탑재된 각종 장비나 의장품 등에 전원을 공급하기 위한 다수의 발전용 엔진 등이 설치되어 운영되고 있다.Generally, ships are equipped with a main engine that drives a propeller to propel a ship, and a number of power generation engines that supply power to various equipment 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. 여기서 우레아는 열분해 또는 가수분해되어 암모니아(NH3)로 변환된다.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 (NH 3 ), urea (Urea) and the like in the catalyst layer . Here, the urea is pyrolyzed or hydrolyzed and converted to ammonia (NH 3 ).

SCR 처리 과정에 대해 좀 더 살펴보면, 배기가스가 SCR 시스템의 SCR 반응기를 통과하는 과정에서 배기가스에 포함된 질소 산화물(NOx)은 SCR 반응기 내부로 주입된 암모니아(NH3) 및 촉매와 접촉하게 된다.As for the process of SCR, nitrogen oxides (NOx) contained in the exhaust gas are brought into contact with the ammonia (NH 3 ) injected into the SCR reactor and the catalyst when the exhaust gas passes through the SCR reactor of the SCR system .

암모니아(NH3) 및 촉매와 접촉한 질소 산화물(NOx)은 아래의 반응식에 의해 질소 가스(N2)와 물(H2O)로 환원반응이 발생하여 질소 산화물(NOx)이 제거된다.Ammonia (NH 3 ) and nitrogen oxide (NOx) in contact with the catalyst are reduced by nitrogen gas (N 2 ) and water (H 2 O) according to the following reaction formula to remove nitrogen oxides (NOx).

N02+NO+2NH3 --> 2N2+3H2ONO 2 + NO + 2NH 3 - > 2N 2 + 3H 2 O

4NO+4NH3+O2 --> 4N2+6H2O4NO + 4NH 3 + O 2 -> 4N 2 + 6H 2 O

2NO2+4NH3+O2 --> 3N2+6H2O2NO 2 + 4NH 3 + O 2 -> 3N 2 + 6H 2 O

도 1은 종래 기술에 따른 SCR 시스템을 개략적으로 보인 도면이다.1 is a schematic view of a conventional SCR system.

도 1에 도시하는 바와 같이 종래에는 우레아 분사 장치(5)가 SCR 반응기(1)로 유입되는 배기가스에 우레아를 분사하여 주입한다.1, the urea injection device 5 injects urea into the exhaust gas flowing into the SCR reactor 1 and injects it.

우레아 분사 장치(5)에서 분사된 우레아는 배기가스와 혼합되어 SCR 반응기(1)로 공급된다.The urea injected from the urea injector 5 is mixed with the exhaust gas and supplied to the SCR reactor 1.

배기가스 라인(3)을 통해 유입되는 고온의 배기가스와 만난 우레아는 열분해되어 암모니아(NH3)로 변환되는데, 이때 온도가 적절하지 않으면 HNCO가 생성되기도 한다.The urea that is in contact with the hot exhaust gas flowing through the exhaust gas line 3 is pyrolyzed and converted into ammonia (NH 3 ). If the temperature is not proper, HNCO is generated.

HNCO는 산화성이 강한 물질로 배관 등에 부식을 일으키고, SCR 촉매에 달라붙어 SCR 촉매의 작용을 방해하는 등의 문제점을 일으킨다.HNCO is a highly oxidative substance, which causes corrosion in piping and the like, and adheres to the SCR catalyst, thereby causing problems such as hindering the action of the SCR catalyst.

한국공개특허공보 제10-2010-0069761호(공개일 2010.06.25.)Korean Patent Publication No. 10-2010-0069761 (published on June 25, 2010)

본 발명은 전술한 문제점을 해결하기 위해 안출된 것으로서, 우레아 수용액을 일정 온도 이상으로 가열하여 카르밤산암모늄으로 변환시킨 후, 이를 SCR 반응기로 유입되는 배기가스에 분사함으로써, HNCO의 생성을 방지할 수 있도록 하는 SCR 시스템을 제공함에 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the above problems, and it is an object of the present invention to provide a method for preventing the formation of HNCO by heating an aqueous urea solution to a temperature higher than a certain temperature and converting it into ammonium carbamic acid and injecting it into an exhaust gas flowing into an SCR reactor The present invention provides an SCR system in which

전술한 목적을 달성하기 위한 본 발명의 일 실시예에 따른 SCR 시스템은, 배기가스 내의 유해 성분을 제거하는 SCR 촉매가 설치된 SCR 반응기; 엔진의 배기가스를 상기 SCR 반응기로 유도하는 배기가스 라인; 우레아 저장 탱크에 저장되어 있는 우레아 수용액을 상기 배기가스 라인으로 유도하는 우레아 공급 라인; 상기 우레아 공급 라인을 통해 상기 배기가스 라인으로 유도되는 우레아 수용액을 가열하는 가열 장치; 및 상기 가열 장치에 의해 가열된 우레아 수용액이 상기 우레아 공급 라인에서 화학 반응을 일으켜 변환된 카르밤산암모늄(Ammonium Carbamate:NH4CO2NH2)을 상기 SCR 반응기로 유입되는 배기가스에 분사하는 분사 노즐;을 포함하여 이루어지는 것이 바람직하다.According to an aspect of the present invention, there is provided an SCR system including an SCR reactor equipped with an SCR catalyst for removing harmful components in an exhaust gas; An exhaust line for leading the exhaust gas of the engine to the SCR reactor; A urea supply line for leading the urea aqueous solution stored in the urea storage tank to the exhaust gas line; A heating device for heating the urea aqueous solution led to the exhaust gas line through the urea supply line; And an injection nozzle for injecting ammonia carbamate (NH 4 CO 2 NH 2 ) converted into an urea aqueous solution heated by the heating device by a chemical reaction in the urea supply line into an exhaust gas flowing into the SCR reactor ; And the like.

본 발명의 SCR 시스템에 따르면, 우레아 수용액을 일정 온도 이상으로 가열하여 카르밤산암모늄으로 변환시킨 후, 이를 SCR 반응기로 유입되는 배기가스에 분사함으로써, HNCO의 생성을 방지할 수 있게 된다.According to the SCR system of the present invention, it is possible to prevent the formation of HNCO by heating the urea aqueous solution to a temperature higher than a certain temperature and converting it into ammonium carbamic acid and injecting it into the exhaust gas flowing into the SCR reactor.

또한 HNCO의 생성을 방지하여 SCR 촉매의 성능을 향상시키고, SCR 시스템의 수명을 연장시킬 수 있게 된다.In addition, it is possible to prevent the production of HNCO, thereby improving the performance of the SCR catalyst and extending the life of the SCR system.

도 1은 종래 기술에 따른 SCR 시스템을 개략적으로 보인 도면이다.
도 2는 본 발명의 일 실시예에 따른 SCR 시스템을 개략적으로 보인 도면이다.1 is a schematic view of a conventional SCR system.
2 is a schematic diagram of an SCR system according to an embodiment of the present invention.

이하에서는 첨부한 도면을 참조하여 본 발명의 바람직한 실시예에 따른 SCR 시스템에 대해서 상세하게 설명한다.Hereinafter, an SCR system according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

본 발명에 따른 SCR 시스템은 우레아 수용액을 분사하기 전에 일정 온도 이상으로 가열하여 화학 반응을 일으켜 우레아 수용액을 카르밤산암모늄(NH4CO2NH2)으로 변환시킨 후, 이를 SCR 반응기로 유입되는 배기가스에 분사하여 HNCO의 생성을 방지토록 하는 것이다.In the SCR system according to the present invention, before the urea aqueous solution is injected, the urea aqueous solution is heated to a predetermined temperature or higher to cause a chemical reaction to convert the urea aqueous solution into ammonium carbamate (NH 4 CO 2 NH 2 ) So as to prevent the generation of HNCO.

여기서 우레아 수용액을 카르밤산암모늄으로 변환시키기 위해서는 온도 조건이 맞아야 하는데, 우레아 수용액이 카르밤산암모늄으로 변환되기 위해서는 반응기 내의 온도가 일정 온도 예를 들어, 150℃ 이상을 유지해야 한다. 그리고 반응기 내의 온도가 일정 온도 이상을 유지하더라도 우레아 수용액이 카르밤산암모늄으로 변환되기 위해서는 반응 속도가 느려 일정 시간이 소요되므로, 우레아 수용액이 반응기 내에서 일정 시간 예를 들어, 5분 이상 체류해야 한다.In order to convert the urea aqueous solution into ammonium carbamate, the temperature condition must be satisfied. In order for the urea aqueous solution to be converted to ammonium carbamate, the temperature in the reactor must be maintained at a certain temperature, for example, 150 ° C or more. Also, even if the temperature in the reactor is maintained at a predetermined temperature or higher, the urea aqueous solution needs to stay in the reactor for a certain period of time, for example, for 5 minutes or more because the reaction rate is slow and takes a certain time for the urea aqueous solution to be converted to ammonium carbamate.

도 2는 본 발명의 일 실시예에 따른 SCR 시스템을 개략적으로 보인 도면이다.2 is a schematic diagram of an SCR system according to an embodiment of the present invention.

도 2에서 SCR 반응기(10)는 배기가스 내의 유해 성분을 제거하는 SCR 촉매(20)가 설치된다.2, the SCR reactor 10 is provided with an SCR catalyst 20 for removing harmful components in the exhaust gas.

배기가스 라인(30)은 엔진(미도시)의 배기가스를 SCR 반응기(10)로 유도한다.The exhaust line 30 leads the exhaust of the engine (not shown) to the SCR reactor 10.

우레아 저장 탱크(40)는 우레아 수용액을 저장한다.The urea storage tank 40 stores an aqueous urea solution.

우레아 공급 펌프(미도시)는 우레아 저장 탱크(40)에 저장되어 있는 우레아 수용액이 우레아 공급 라인(50)으로 공급되도록 펌핑한다.A urea feed pump (not shown) pumps the urea aqueous solution stored in the urea storage tank 40 to the urea feed line 50.

우레아 공급 라인(50)은 우레아 저장 탱크(40)에 저장되어 있는 우레아 수용액을 배기가스 라인(30)으로 유도한다.The urea feed line 50 directs the urea aqueous solution stored in the urea storage tank 40 to the exhaust gas line 30.

전술한 우레아 공급 라인(50)은 우레아 수용액이 카르밤산암모늄으로 변환되기 위해 필요한 최소 반응 시간(예를 들어, 5분) 이상 체류할 수 있도록 충분히 길게 형성되는 것이 바람직하다.The urea supply line 50 described above is preferably formed to be sufficiently long so that the urea aqueous solution can stay for a minimum reaction time (for example, 5 minutes) necessary for conversion to ammonium carbamic acid.

가열 장치(70)는 우레아 공급 라인(50)을 통해 배기가스 라인(30)으로 유도되는 우레아 수용액을 가열한다.The heating device 70 heats the urea aqueous solution led to the exhaust gas line 30 through the urea feed line 50.

전술한 가열 장치(70)는 우레아 공급 라인(50)의 외주면을 감싸는 히터 자켓, 히터 코일 등으로 구현될 수 있다.The heating device 70 may be implemented by a heater jacket, a heater coil, or the like that surrounds the outer peripheral surface of the urea supply line 50.

또한 가열 장치(70)는 우레아 공급 라인(50) 전체를 감싸도록 설치되는 것이 바람직하다.The heating device 70 is preferably installed to surround the entire urea supply line 50.

분사 노즐(60)은 가열 장치(70)에 의해 가열된 우레아 수용액이 우레아 공급 라인(50)에서 화학 반응을 일으켜 변환된 카르밤산암모늄을 SCR 반응기(10)로 유입되는 배기가스에 분사한다.The urea aqueous solution heated by the heating device 70 causes a chemical reaction in the urea feed line 50 to inject the converted ammonium carbamate into the exhaust gas flowing into the SCR reactor 10.

온도 측정 수단(80)은 우레아 공급 라인(50)에 설치되어 온도를 측정하고, 측정된 온도 값을 제어부(90)로 실시간 인가한다.The temperature measuring means 80 is installed in the urea supply line 50 to measure the temperature and apply the measured temperature value to the control unit 90 in real time.

제어부(90)는 SCR 시스템 운전시 온도 측정 수단(80)을 통해 측정된 온도가 기설정된 온도(예를 들어, 150℃) 이하이면, 가열 장치(70)를 제어하여 우레아 공급 라인(50) 내의 온도를 우레아 수용액이 카르밤산암모늄으로 변환되기 위해 필요한 최소 온도(예를 들어, 150℃) 이상으로 유지시킨다.The control unit 90 controls the heating device 70 so that the temperature of the inside of the urea supply line 50 is maintained at a predetermined temperature (for example, 150 캜) The temperature is maintained above the minimum temperature (e.g., 150 < 0 > C) necessary for the aqueous urea solution to be converted to ammonium carbamic acid.

이상에서 살펴본 바와 같은 구성의 본 발명에 따른 SCR 시스템의 동작에 대해 살펴보면 다음과 같다.Hereinafter, the operation of the SCR system according to the present invention will be described.

우선 SCR 시스템이 운전중이면, 제어부(90)는 가열 장치(70)를 구동시켜 우레아 공급 라인(50)을 통해 배기가스 라인(30)으로 유도되는 우레아 수용액을 가열한다.First, when the SCR system is in operation, the control unit 90 drives the heating device 70 to heat the urea aqueous solution led to the exhaust gas line 30 through the urea supply line 50.

여기서 제어부(90)는 온도 측정 수단(80)을 통해 실시간 인가되는 우레아 공급 라인(50) 내의 온도가 기설정된 온도 즉, 우레아 수용액이 카르밤산암모늄으로 변환되기 위해 필요한 최소 온도(예를 들어, 150℃) 이하이면, 가열 장치(70)를 제어하여 우레아 공급 라인(50) 내의 온도를 기설정된 온도(예를 들어, 150℃) 이상으로 유지시킨다.The control unit 90 controls the temperature of the urea feed line 50 to be supplied in real time via the temperature measuring means 80 to a predetermined temperature, that is, the minimum temperature required for the urea aqueous solution to be converted to ammonium carbamate ° C.), the heating device 70 is controlled to maintain the temperature in the urea supply line 50 at a predetermined temperature (for example, 150 ° C.) or higher.

한편 본 발명의 다른 실시예에서 제어부(90)는 우레아 공급 라인(50) 내에서 우레아 수용액이 카르밤산암모늄으로 변환될 수 있도록 하기 위해, 우레아 수용액이 일정 시간(예를 들어, 5분) 이상 우레아 공급 라인(50) 내에서 체류할 수 있도록 우레아 공급 라인(50)을 통해 배기가스 라인(30)으로 유도되는 우레아 수용액의 유속을 느리게 조절할 수도 있다.In another embodiment of the present invention, in order to enable the urea aqueous solution to be converted into ammonium carbamate in the urea feed line 50, the urea aqueous solution may contain urea aqueous solution for a predetermined time (for example, 5 minutes) The flow rate of the urea aqueous solution led to the exhaust gas line 30 through the urea feed line 50 may be adjusted to allow it to stay in the feed line 50.

이상에서 살펴본 바와 같이 본 발명에서는 우레아 수용액을 분사하기 전에 우레아 수용을 일정 온도 이상으로 가열하여 카르밤산암모늄으로 변환시킨 후, 이 카르밤산암모늄을 SCR 반응기(10)로 유입되는 배기가스에 분사한다.As described above, in the present invention, before the urea aqueous solution is injected, the urea aqueous solution is heated to a temperature higher than a certain temperature to convert it into ammonium carbamic acid, and the ammonium carbamic acid is injected into the exhaust gas flowing into the SCR reactor 10.

이와 같이 SCR 반응기(10)로 유입되는 배기가스에 분사되는 카르밤산암모늄은 HNCO와 암모니아를 생성하는 우레아 수용액과는 달리 2개의 암모니아 분자를 생성한다. 따라서 HNCO의 생성을 방지할 수 있게 된다.Thus, the ammonium carbamate injected into the exhaust gas flowing into the SCR reactor 10 generates two ammonia molecules unlike the urea aqueous solution which generates HNCO and ammonia. Therefore, it is possible to prevent the generation of HNCO.

본 발명의 SCR 시스템은 전술한 실시예에 국한되지 않고 본 발명의 기술 사상이 허용하는 범위 내에서 다양하게 변형하여 실시할 수 있다.The SCR system of the present invention is not limited to the above-described embodiments, and can be variously modified within the scope of the technical idea of the present invention.

10. SCR 반응기, 20. SCR 촉매,
30. 배기가스 라인, 40. 우레아 저장 탱크,
50. 우레아 공급 라인, 60. 분사 노즐,
70. 가열 장치, 80. 온도 측정 수단,
90. 제어부10. SCR reactor, 20. SCR catalyst,
30. Exhaust gas line, 40. Urea storage tank,
50. Urea supply line, 60. Injection nozzle,
70. Heating device, 80. Temperature measuring means,
90. Control unit

Claims (4)

배기가스 내의 유해 성분을 제거하는 SCR 촉매가 설치된 SCR 반응기;
엔진의 배기가스를 상기 SCR 반응기로 유도하는 배기가스 라인;
우레아 저장 탱크에 저장되어 있는 우레아 수용액을 상기 배기가스 라인으로 유도하는 우레아 공급 라인;
상기 우레아 공급 라인을 통해 상기 배기가스 라인으로 유도되는 우레아 수용액을 가열하는 가열 장치; 및
상기 가열 장치에 의해 가열된 우레아 수용액이 상기 우레아 공급 라인에서 화학 반응을 일으켜 변환된 카르밤산암모늄(Ammonium Carbamate:NH4CO2NH2)을 상기 SCR 반응기로 유입되는 배기가스에 분사하는 분사 노즐;을 포함하여 이루어지는 SCR 시스템.An SCR reactor provided with an SCR catalyst for removing harmful components in the exhaust gas;
An exhaust line for leading the exhaust gas of the engine to the SCR reactor;
A urea supply line for leading the urea aqueous solution stored in the urea storage tank to the exhaust gas line;
A heating device for heating the urea aqueous solution led to the exhaust gas line through the urea supply line; And
A spray nozzle for spraying a urea aqueous solution heated by the heating device into an exhaust gas flowing into the SCR reactor, the ammonia carbamate (NH 4 CO 2 NH 2 ) converted by causing a chemical reaction in the urea supply line; And the SCR system. 제 1항에 있어서,
상기 우레아 공급 라인에 설치되어 온도를 측정하는 온도 측정 수단; 및
SCR 시스템 운전시 상기 온도 측정 수단을 통해 측정된 온도가 기설정된 온도 이하이면, 상기 가열 장치를 제어하여 상기 우레아 공급 라인 내의 온도를 상기 우레아 수용액이 카르밤산암모늄으로 변환되기 위해 필요한 최소 온도 이상으로 유지시키는 제어부;를 더 포함하여 이루어지는 SCR 시스템.The method according to claim 1,
Temperature measuring means installed on the urea supply line for measuring the temperature; And
When the temperature measured by the temperature measuring means is lower than a predetermined temperature during operation of the SCR system, the heating device is controlled to maintain the temperature in the urea supply line at or above a minimum temperature necessary for converting the urea aqueous solution into ammonium carbamic acid The SCR system comprising: 제 1항 또는 제 2항에 있어서,
상기 가열 장치는,
상기 우레아 공급 라인 전체를 감싸도록 설치되는 것을 특징으로 하는 SCR 시스템.3. The method according to claim 1 or 2,
The heating device includes:
Wherein the SCR system is installed so as to surround the entire urea supply line. 제 1항 또는 제 2항에 있어서,
상기 우레아 공급 라인은,
상기 우레아 수용액이 카르밤산암모늄(Ammonium Carbamate:NH4CO2NH2)으로 변환되기 위해 필요한 최소 반응 시간 이상 체류할 수 있는 길이로 형성되는 것을 특징으로 하는 SCR 시스템.3. The method according to claim 1 or 2,
The urea supply line
Wherein the urea aqueous solution is formed to have a length capable of staying for a minimum reaction time necessary for conversion to ammonium carbamate (NH 4 CO 2 NH 2 ).
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US10718245B2 (en) 2018-06-13 2020-07-21 Deere & Company Exhaust gas treatment system and method having improved low temperature performance
EP3581772A1 (en) * 2018-06-13 2019-12-18 Deere & Company Exhaust gas treatment system and method having improved low temperature performance
EP3581773A1 (en) * 2018-06-13 2019-12-18 Deere & Company Exhaust gas treatment system and method having improved low temperature performance
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EP3650666A1 (en) * 2018-11-08 2020-05-13 Faurecia Emissions Control Technologies, USA, LLC Automotive exhaust aftertreatment system having onboard ammonia reactor with hybrid heating
US10683787B2 (en) 2018-11-08 2020-06-16 Faurecia Emissions Control Technologies, Usa, Llc Automotive exhaust aftertreatment system having onboard ammonia reactor with hybrid heating
US10767529B2 (en) 2018-11-08 2020-09-08 Faurecia Emissions Control Technologies, Usa, Llc Automotive exhaust aftertreatment system having onboard ammonia reactor with heated doser
US10876454B2 (en) 2018-11-08 2020-12-29 Faurecia Emissions Control Technologies, Usa, Llc Automotive exhaust aftertreatment system with multi-reductant injection and doser controls
WO2021054538A1 (en) * 2019-09-17 2021-03-25 대영씨엔이(주) System and method for injecting reducing agent in selective catalytic reduction reaction
US11193413B2 (en) 2019-12-12 2021-12-07 Faurecia Emissions Control Technologies, Usa, Llc Exhaust aftertreatment system with virtual temperature determination and control
US11319853B2 (en) 2020-03-31 2022-05-03 Faurecia Emissions Control Technologies, Usa, Llc Automotive exhaust aftertreatment system with doser
US11022014B1 (en) 2020-04-28 2021-06-01 Faurecia Emissions Control Technologies, Usa, Llc Exhaust aftertreatment system with heated flash-boiling doser
US11092054B1 (en) 2020-04-29 2021-08-17 Faurecia Emissions Control Technologies, Usa, Llc Flash-boiling doser with thermal transfer helix
US11511239B2 (en) 2020-04-29 2022-11-29 Faurecia Emissions Control Technologies, Usa, Llc Heated flash-boiling doser with integrated helix
CN111686582A (en) * 2020-05-11 2020-09-22 江苏龙蟠科技股份有限公司 Anti-scaling urea solution for vehicles and preparation method thereof
US11384667B2 (en) 2020-05-29 2022-07-12 Faurecia Emissions Control Technologies, Usa, Llc Exhaust aftertreatment system with heated dosing control
US11225894B1 (en) 2020-06-30 2022-01-18 Faurecia Emissions Control Technologies, Usa, Llc Exhaust aftertreatment system with thermally controlled reagent doser

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