KR20160012612A - Apparatus for controlling temperature of exhaust gas and supplying of reducing agent in selective catalytic reduction system - Google Patents

Apparatus for controlling temperature of exhaust gas and supplying of reducing agent in selective catalytic reduction system Download PDF

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KR20160012612A
KR20160012612A KR1020140094253A KR20140094253A KR20160012612A KR 20160012612 A KR20160012612 A KR 20160012612A KR 1020140094253 A KR1020140094253 A KR 1020140094253A KR 20140094253 A KR20140094253 A KR 20140094253A KR 20160012612 A KR20160012612 A KR 20160012612A
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South Korea
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exhaust gas
reducing agent
temperature
scr reactor
amount
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KR1020140094253A
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Korean (ko)
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김규종
양희성
김현수
김태현
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현대중공업 주식회사
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Publication of KR20160012612A publication Critical patent/KR20160012612A/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
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/04—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
    • 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
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • 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
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The present invention relates to an apparatus for controlling the temperature of exhaust gas and the supply of a reducing agent in an SCR system, capable of constantly maintaining the temperature of exhaust gas received from an SCR reactor, optimizing the amount of a reducing agent received to the SCR reactor, and improving the efficiency of the exhaust gas of an nitrogenous compound. The apparatus for controlling the temperature of exhaust gas and the supply of a reducing agent in an SCR system according to the present invention comprises: an SCR reactor, a reducing agent supply device, a temperature sensor, a nitrogenous compound detecting sensor, a heat exchanger, and a control unit. The SCR reactor provides a space for performing a reduction reaction between the nitrogenous compound and the reducing agent in the exhaust gas. The reducing agent supply device supplies the reducing agent to the SCR reactor. The temperature sensor measures the temperature of the exhaust gas inputted to the SCR reactor. The nitrogenous compound detecting sensor detects the amount of the nitrogenous compound included in the exhaust gas exhausted from the SCR reactor. The heat exchange is positioned in the front end of the SCR reactor, increases/decreases the temperature of the exhaust gas exhausted from an engine based on a reference temperature. The control unit controls the heat exchanger so that the exhaust gas exhausted through the heat exchanger can have the reference temperature, and controls the amount of the reducing agent supplied to the SCR reactor from the reducing agent supply device.

Description

SCR 시스템의 배기가스 온도 및 환원제 공급량 제어장치{Apparatus for controlling temperature of exhaust gas and supplying of reducing agent in selective catalytic reduction system}TECHNICAL FIELD The present invention relates to an exhaust gas temperature control apparatus and an exhaust gas recirculation control apparatus,

본 발명은 SCR 시스템의 배기가스 온도 및 환원제 공급량 제어장치에 관한 것으로서, 보다 상세하게는 SCR 반응기에 유입되는 배기가스의 온도를 일정하게 유지시켜 SCR 반응기에 공급되는 환원제의 양을 최적화함과 함께 질소산화물 환원반응 효율을 향상시킬 수 있는 SCR 시스템의 배기가스 온도 및 환원제 공급량 제어장치에 관한 것이다.
More particularly, the present invention relates to an apparatus for controlling exhaust gas temperature and reducing agent supply amount in an SCR system, and more particularly, to an apparatus for controlling an exhaust gas temperature and a reducing agent supply amount of an SCR system by optimizing the amount of reducing agent supplied to the SCR reactor, And an apparatus for controlling exhaust gas temperature and reducing agent supply amount in an SCR system capable of improving the efficiency of oxide reduction reaction.

선박에서 배출되는 배기가스에 포함되어 있는 질소산화물(NOx) 및 황산화물은 국제해사기구(IMO, International Maritime Organization)에 의해 배출규제를 받고 있는 대표적인 대기오염물질이다. Nitrogen oxides (NO x ) and sulfur oxides contained in the exhaust gas from ships are representative air pollutants subject to emission regulation by the International Maritime Organization (IMO).

질소산화물을 제거하기 위해 선박에는 통상, 선택적촉매환원 장치(selective catalytic reduction system)(이하, SCR 장치라 함)가 구비된다. SCR 장치는 촉매가 내장된 SCR 반응기, SCR 반응기 내에 요소수(尿素水)와 같은 환원제를 공급하는 환원제 공급장치를 구비한다. In order to remove nitrogen oxide, a ship is usually equipped with a selective catalytic reduction system (hereinafter referred to as SCR device). The SCR apparatus includes a SCR reactor having a catalyst and a reducing agent supply unit for supplying a reducing agent such as urea water into the SCR reactor.

SCR 장치에 의한 질소산화물 제거는 다음과 같은 과정으로 진행된다. 엔진의 배기가스가 SCR 반응기에 유입되는 상태에서 SCR 반응기 내에 환원제가 공급되면, 환원제가 배기가스와 섞여 촉매를 통과하게 되며 촉매를 통과하는 과정에서 환원제로부터 가수분해된 암모니아가 배기가스 내의 질소산화물(NOx)과 반응하여 질소산화물(NOx)이 질소(N2)와 수증기로 환원된다. The removal of nitrogen oxide by the SCR apparatus proceeds as follows. When the reducing agent is supplied to the SCR reactor while the exhaust gas of the engine is flowing into the SCR reactor, the reducing agent is mixed with the exhaust gas and passes through the catalyst. During the passage through the catalyst, ammonia hydrolyzed from the reducing agent is converted into nitrogen oxides NO x ) is reduced to nitrogen (N 2 ) and water vapor by reacting with NO x .

종래의 SCR 장치의 경우, 미리 설정된 일정량의 환원제가 지속적으로 SCR 반응기에 공급하도록 설계되어 있어 환원제가 낭비되는 문제점이 있었으며, 이를 해결하기 위해 본 출원인은 한국특허출원 2013-147577호를 통해 배기가스 내의 질소산화물(NOx)의 양에 따라 환원제를 선택적으로 공급하는 기술을 제시한 바 있다. In the case of the conventional SCR apparatus, a predetermined amount of the reducing agent is designed to continuously supply to the SCR reactor, and thus a reducing agent is wasted. In order to solve this problem, the present applicant has proposed Korean Patent Application No. 2013-147577 A technique of selectively supplying a reducing agent according to the amount of nitrogen oxides (NO x ) has been proposed.

한편, 엔진으로부터 배출되어 SCR 장치에 유입되는 배기가스는 엔진 부하에 따라 그 온도가 다양하게 변화한다. 배기가스 내의 질소산화물(NOx)의 양이 동일하더라도 배기가스의 온도가 변화되면 SCR 장치에 의한 질소산화물 환원반응에 영향을 미치게 된다. On the other hand, the temperature of the exhaust gas discharged from the engine and flowing into the SCR device varies in accordance with the engine load. Even if the amount of nitrogen oxides (NO x ) in the exhaust gas is the same, a change in the temperature of the exhaust gas affects the nitrogen oxide reduction reaction by the SCR device.

한국특허출원 2013-147577호Korean Patent Application No. 2013-147577

본 발명은 상기와 같은 문제점을 해결하기 위해 안출한 것으로서, SCR 반응기에 유입되는 배기가스의 온도를 일정하게 유지시켜 SCR 반응기에 공급되는 환원제의 양을 최적화함과 함께 질소산화물 환원반응 효율을 향상시킬 수 있는 SCR 시스템의 배기가스 온도 및 환원제 공급량 제어장치를 제공하는데 그 목적이 있다.
SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to optimize the amount of the reducing agent supplied to the SCR reactor by maintaining the temperature of the exhaust gas flowing into the SCR reactor constant, And an exhaust gas temperature of the SCR system and a reducing agent supply amount control device.

상기의 목적을 달성하기 위한 본 발명에 따른 SCR 시스템의 배기가스 온도 및 환원제 공급량 제어장치는 배기가스 내의 질소산화물과 환원제의 환원반응이 진행되는 공간을 제공하는 SCR 반응기와, 상기 SCR 반응기에 환원제를 공급하는 환원제 공급장치와, 상기 SCR 반응기에 유입되는 배기가스의 온도를 측정하는 온도센서와, 상기 SCR 반응기로부터 배출되는 배기가스에 포함되어 있는 질소산화물의 양을 검출하는 질소산화물 검출센서와, 상기 SCR 반응기의 전단에 구비되어, 엔진으로부터 배출되는 배기가스의 온도를 기준온도로 상승시키거나 냉각시키는 역할을 하는 열교환기 및 상기 열교환기를 통해 배출되는 배기가스가 기준온도를 갖도록 상기 열교환기를 제어함과 함께 상기 환원제 공급장치로부터 상기 SCR 반응기로 공급되는 환원제의 양을 제어하는 제어수단을 포함하여 이루어지는 것을 특징으로 한다. In order to accomplish the above object, the apparatus for controlling the exhaust gas temperature and the reducing agent supply amount in the SCR system according to the present invention comprises a SCR reactor for providing a space in which a reduction reaction of nitrogen oxide and reducing agent in exhaust gas proceeds, A nitrogen oxide detection sensor for detecting an amount of nitrogen oxide contained in the exhaust gas discharged from the SCR reactor; and a nitrogen oxide sensor for detecting the amount of nitrogen oxide contained in the exhaust gas discharged from the SCR reactor, A heat exchanger provided at a front end of the SCR reactor and serving to raise or lower the temperature of the exhaust gas discharged from the engine to a reference temperature and an exhaust gas discharged through the heat exchanger to control the heat exchanger to have a reference temperature, And the amount of the reducing agent supplied from the reducing agent supply device to the SCR reactor And characterized by comprising control means for.

상기 제어수단은 상기 온도센서에 의해 검출된 배기가스의 온도와 기준온도를 비교하고, 측정된 배기가스 온도가 기준온도에서 벗어나면 상기 열교환기로부터 배출되는 배기가스의 온도가 기준온도에 부합되도록 상기 열교환기를 제어한다. Wherein the control means compares the temperature of the exhaust gas detected by the temperature sensor with a reference temperature, and when the measured exhaust gas temperature deviates from the reference temperature, the temperature of the exhaust gas discharged from the heat exchanger Controls the heat exchanger.

또한, 상기 제어수단은 기준온도를 갖는 배기가스가 SCR 반응기에 유입되는 상태에서, 상기 질소산화물 검출센서로부터 검출된 질소산화물 정량정보에 기반하여, 검출된 질소산화물 정량정보에 대응되는 환원제의 양이 상기 SCR 반응기에 공급되도록 상기 환원제 공급장치를 제어하며, 상기 제어수단은 기준온도 하에서의 질소산화물의 양에 따른 환원제 공급량 정보를 저장한다. The control means may control the amount of the reducing agent corresponding to the detected nitrogen oxide quantitative information based on the nitrogen oxide quantitative information detected from the nitrogen oxide detecting sensor in a state where the exhaust gas having the reference temperature flows into the SCR reactor And controls the reducing agent supply device to be supplied to the SCR reactor, and the control means stores the reducing agent supply amount information according to the amount of nitrogen oxide under the reference temperature.

상기 SCR 반응기에 유입되는 배기가스의 기준온도는 280∼320℃로 제어될 수 있다.
The reference temperature of the exhaust gas flowing into the SCR reactor may be controlled to 280 to 320 캜.

본 발명에 따른 SCR 시스템의 배기가스 온도 및 환원제 공급량 제어장치는 다음과 같은 효과가 있다. The apparatus for controlling exhaust gas temperature and reducing agent supply amount in the SCR system according to the present invention has the following effects.

SCR 반응기에 유입되는 배기가스의 온도를 질소산화물의 환원반응 효율이 최대화되는 최적 온도로 제어하고, 이와 같은 상태에서 SCR 반응기로부터 배출되는 질소산화물의 양에 따라 환원제 공급량을 제어함을 통해, SCR 반응기의 환원반응 효율을 향상시킴과 함께 환원제 공급량을 최적화할 수 있게 된다.
The temperature of the exhaust gas flowing into the SCR reactor is controlled to the optimum temperature at which the reduction efficiency of the nitrogen oxide is maximized and the amount of the reducing agent supplied is controlled according to the amount of nitrogen oxide discharged from the SCR reactor in this state, The reduction reaction efficiency of the reducing agent can be improved and the amount of the reducing agent supplied can be optimized.

도 1은 본 발명의 일 실시예에 따른 SCR 시스템의 배기가스 온도 및 환원제 공급량 제어장치의 구성도.
도 2는 SCR 장치에서의 반응온도에 따른 질소산화물 제거효율을 나타낸 그래프. 1 is a configuration diagram of an exhaust gas temperature and reducing agent supply amount control apparatus of an SCR system according to an embodiment of the present invention;
2 is a graph showing the removal efficiency of nitrogen oxide according to the reaction temperature in the SCR apparatus.

본 발명은 SCR 반응기에 투입되는 환원제의 양을 최적화하는 기술을 제시한다. SCR 반응기에 투입되는 환원제 공급량의 최적화는 1) SCR 반응기로부터 배출되는 질소산화물의 양과 2) SCR 반응기에 유입되는 배기가스의 온도가 고려되어야 한다. The present invention provides a technique for optimizing the amount of reducing agent introduced into an SCR reactor. Optimization of the amount of reducing agent fed into the SCR reactor should take into account 1) the amount of nitrogen oxides discharged from the SCR reactor and 2) the temperature of the exhaust gas entering the SCR reactor.

SCR 반응기로부터 배출되는 질소산화물의 양에 따라 SCR 반응기에 투입되는 환원제의 양을 선택적으로 조절해야 하며, 이와 함께 SCR 반응기 내에서의 질소산화물 환원반응을 일정하게 유지시키기 위해서는 SCR 반응기 내에 유입되는 배기가스의 온도를 최적 온도로 일정하게 유지시켜야 한다. SCR 반응기 내에서의 질소산화물 환원반응은 온도에 따라 반응효율이 변동되는 특성이 있다. 도 2를 참조하면, SCR 장치에서의 배기가스의 온도에 따른 질소산화물 제거효율은 촉매의 특성 및 종류에 따라 다소 차이는 있으나, 280∼320℃의 반응온도에서 95% 이상의 제거효율을 나타낸다. The amount of reducing agent to be supplied to the SCR reactor must be selectively controlled according to the amount of nitrogen oxides discharged from the SCR reactor. In addition, in order to maintain the nitrogen oxide reduction reaction in the SCR reactor constantly, Should be kept constant at the optimum temperature. The NOx reduction reaction in the SCR reactor is characterized in that the reaction efficiency varies depending on the temperature. Referring to FIG. 2, the removal efficiency of nitrogen oxides according to the temperature of the exhaust gas in the SCR apparatus is more than 95% at a reaction temperature of 280 to 320 ° C, depending on the characteristics and kinds of catalysts.

이에, 본 발명은 SCR 반응기에 유입되는 배기가스의 온도를 최적 온도로 제어하여 질소산화물 환원반응 효율을 최대화시키고, 이와 같은 상태에서 SCR 반응기로부터 배출되는 질소산화물의 양을 검출하고 해당 질소산화물의 양에 대응하여 환원제 공급량을 결정하는 기술을 제시한다. 이하, 도면을 참조하여 본 발명의 일 실시예에 따른 SCR 시스템의 배기가스 온도 및 환원제 공급량 제어장치를 상세히 설명하기로 한다. Therefore, the present invention maximizes the efficiency of the nitrogen oxide reduction reaction by controlling the temperature of the exhaust gas flowing into the SCR reactor to an optimum temperature, detects the amount of nitrogen oxide discharged from the SCR reactor in such a state, The amount of reducing agent supplied is determined. Hereinafter, an apparatus for controlling exhaust gas temperature and reducing agent supply amount in an SCR system according to an embodiment of the present invention will be described in detail with reference to the drawings.

도 1을 참조하면, 본 발명의 일 실시예에 따른 SCR 시스템의 배기가스 온도 및 환원제 공급량 제어장치는 SCR 반응기(120), 환원제 공급장치(130), 온도센서(141), 질소산화물 검출센서(142), 열교환기(110) 및 제어수단(150)을 포함하여 구성된다. 1, an exhaust gas temperature and reducing agent supply amount control apparatus of an SCR system according to an embodiment of the present invention includes an SCR reactor 120, a reducing agent supply unit 130, a temperature sensor 141, a nitrogen oxide detection sensor 142, a heat exchanger 110, and a control means 150.

상기 SCR 반응기(120)는 배기가스 내의 질소산화물과 환원제에 의한 환원반응이 진행되는 공간을 제공하며, SCR 반응기(120) 내에는 환원반응을 촉진하는 촉매가 구비된다. 상기 환원제 공급장치(130)는 상기 SCR 반응기(120) 내에 우레아(urea) 등의 환원제를 공급하는 역할을 한다. The SCR reactor 120 provides a space in which the reduction reaction by the reducing agent with the nitrogen oxide in the exhaust gas proceeds, and a catalyst for promoting the reduction reaction is provided in the SCR reactor 120. The reducing agent supply device 130 serves to supply a reducing agent such as urea into the SCR reactor 120.

상기 온도센서(141)는 상기 SCR 반응기(120)에 유입되는 배기가스의 온도를 측정하는 역할을 하며, 상기 질소산화물 검출센서(142)는 상기 SCR 반응기(120)로부터 배출되는 배기가스에 포함되어 있는 질소산화물의 양을 검출하는 역할을 한다. The temperature sensor 141 measures the temperature of the exhaust gas flowing into the SCR reactor 120 and the nitrogen oxide detection sensor 142 is included in the exhaust gas discharged from the SCR reactor 120 And also serves to detect the amount of nitrogen oxides present.

상기 열교환기(110)는 상기 SCR 반응기(120)의 전단에 구비되어, 엔진(10)으로부터 배출되는 배기가스의 온도를 기준온도로 상승시키거나 냉각시키는 역할을 한다. 상기 열교환기(110)의 열교환 매체는 물, 스팀, 유기랭킨사이클(ORC) 발전에 사용되는 유기용매, 초임계이산화탄소 발전에 사용되는 이산화탄소 중 어느 하나일 수 있다. The heat exchanger 110 is installed at a front end of the SCR reactor 120 to raise or lower the temperature of the exhaust gas discharged from the engine 10 to a reference temperature. The heat exchange medium of the heat exchanger 110 may be any one of water, steam, organic solvent used for organic Rankine cycle (ORC) power generation, and carbon dioxide used for supercritical carbon dioxide power generation.

이에 따라, 상기 SCR 반응기(120)에는 기준온도로 설정된 배기가스가 유입된다. 상기 기준온도로 함은 SCR 반응기(120) 내에서의 질소산화물과 환원제의 환원반응시 환원반응의 효율이 최대화되는 지점의 온도를 일컬으며, 기준온도는 280∼320℃로 제어되어야 한다. 배기가스의 온도가 280℃ 미만이면 질소산화물이 증가되며, 배기가스의 온도가 320℃를 넘게 되면 질소 및 수증기의 포화에 의해 환원반응의 효율이 떨어지게 된다. Accordingly, the exhaust gas set to the reference temperature flows into the SCR reactor 120. The reference temperature refers to the temperature at which the efficiency of the reduction reaction is maximized in the reduction reaction of the nitrogen oxide and the reducing agent in the SCR reactor 120, and the reference temperature should be controlled to 280 to 320 ° C. When the temperature of the exhaust gas is less than 280 ° C, the amount of nitrogen oxides increases. When the temperature of the exhaust gas exceeds 320 ° C, the efficiency of the reduction reaction is lowered due to saturation of nitrogen and water vapor.

상기 제어수단(150)은 상기 열교환기(110)를 통해 배출되는 배기가스가 기준온도 범위의 온도를 갖도록 상기 열교환기(110)를 제어함과 함께 상기 환원제 공급장치(130)로부터 상기 SCR 반응기(120)로 공급되는 환원제의 양을 제어하는 역할을 한다. The control means 150 controls the heat exchanger 110 so that the exhaust gas discharged through the heat exchanger 110 has a temperature within a reference temperature range and the reducing agent supply device 130 supplies the exhaust gas to the SCR reactor 120 of the reaction system.

구체적으로, 상기 제어수단(150)은 상기 온도센서(141)에 의해 검출된 배기가스의 온도와 기준온도를 비교하고, 측정된 배기가스 온도가 기준온도에서 벗어나면 상기 열교환기(110)로부터 배출되는 배기가스의 온도가 기준온도에 부합되도록 상기 열교환기(110)를 제어하는 역할을 한다. 상기 제어수단(150)의 제어에 따라 상기 열교환기(110) 내의 배기가스는 가열 또는 냉각될 수 있다. 이와 함께, 상기 제어수단(150)은 기준온도를 갖는 배기가스가 SCR 반응기(120)에 유입되는 상태에서, 상기 질소산화물 검출센서(142)로부터 검출된 질소산화물 정량정보에 기반하여 검출된 질소산화물 정량정보에 대응되는 환원제의 양이 상기 SCR 반응기(120)에 공급되도록 상기 환원제 공급장치(130)를 제어하는 역할을 한다. 상기 제어수단(150) 내에는 기준온도 하에서의 질소산화물의 양에 따른 환원제 공급량 정보가 저장될 수 있으며, 이에 근거하여 검출된 질소산화물 정량정보에 따라 환원제 공급량이 결정될 수 있다.
Specifically, the control unit 150 compares the temperature of the exhaust gas detected by the temperature sensor 141 with the reference temperature. When the measured exhaust gas temperature deviates from the reference temperature, the control unit 150 exhausts the exhaust gas from the heat exchanger 110 And controls the heat exchanger 110 so that the temperature of the exhaust gas becomes equal to the reference temperature. The exhaust gas in the heat exchanger (110) can be heated or cooled under the control of the control means (150). In addition, the control unit 150 controls the amount of nitrogen oxides (NOx) detected based on the nitrogen oxide quantitative information detected from the nitrogen oxide detecting sensor 142 in a state where the exhaust gas having the reference temperature flows into the SCR reactor 120 And controls the reducing agent supply device 130 so that the amount of the reducing agent corresponding to the quantitative information is supplied to the SCR reactor 120. In the control unit 150, the amount of the reducing agent supply amount may be stored according to the amount of the nitrogen oxide under the reference temperature, and the amount of the reducing agent supplied may be determined according to the detected nitrogen oxide quantitative information.

10 : 엔진 110 : 열교환기
120 : SCR 반응기 130 : 환원제 공급장치
141 : 온도센서 142 : 질소산화물 검출센서
150 : 제어수단10: engine 110: heat exchanger
120: SCR reactor 130: Reducing agent supply device
141: Temperature sensor 142: Nitrogen oxide detection sensor
150: control means

Claims (4)

배기가스 내의 질소산화물과 환원제의 환원반응이 진행되는 공간을 제공하는 SCR 반응기;
상기 SCR 반응기에 환원제를 공급하는 환원제 공급장치;
상기 SCR 반응기에 유입되는 배기가스의 온도를 측정하는 온도센서;
상기 SCR 반응기로부터 배출되는 배기가스에 포함되어 있는 질소산화물의 양을 검출하는 질소산화물 검출센서;
상기 SCR 반응기의 전단에 구비되어, 엔진으로부터 배출되는 배기가스의 온도를 기준온도로 상승시키거나 냉각시키는 역할을 하는 열교환기; 및
상기 열교환기를 통해 배출되는 배기가스가 기준온도를 갖도록 상기 열교환기를 제어함과 함께 상기 환원제 공급장치로부터 상기 SCR 반응기로 공급되는 환원제의 양을 제어하는 제어수단을 포함하여 이루어지는 것을 특징으로 하는 SCR 시스템의 배기가스 온도 및 환원제 공급량 제어장치.
An SCR reactor for providing a space in which the reduction reaction of the nitrogen oxide and the reducing agent in the exhaust gas proceeds;
A reducing agent supply device for supplying a reducing agent to the SCR reactor;
A temperature sensor for measuring the temperature of the exhaust gas flowing into the SCR reactor;
A nitrogen oxide detection sensor for detecting the amount of nitrogen oxide contained in the exhaust gas discharged from the SCR reactor;
A heat exchanger provided at a front end of the SCR reactor and serving to raise or lower the temperature of the exhaust gas discharged from the engine to a reference temperature; And
And a control means for controlling the heat exchanger so that the exhaust gas discharged through the heat exchanger has a reference temperature and controlling the amount of the reducing agent supplied from the reducing agent supply device to the SCR reactor. Apparatus for controlling exhaust gas temperature and reducing agent supply.
제 1 항에 있어서, 상기 제어수단은 상기 온도센서에 의해 검출된 배기가스의 온도와 기준온도를 비교하고, 측정된 배기가스 온도가 기준온도에서 벗어나면 상기 열교환기로부터 배출되는 배기가스의 온도가 기준온도에 부합되도록 상기 열교환기를 제어하는 것을 특징으로 하는 SCR 시스템의 배기가스 온도 및 환원제 공급량 제어장치.
The exhaust gas purification apparatus according to claim 1, wherein the control means compares the temperature of the exhaust gas detected by the temperature sensor with a reference temperature, and when the measured exhaust gas temperature deviates from the reference temperature, the temperature of the exhaust gas discharged from the heat exchanger And the heat exchanger is controlled so as to match the reference temperature.
제 1 항에 있어서, 상기 제어수단은 기준온도를 갖는 배기가스가 SCR 반응기에 유입되는 상태에서, 상기 질소산화물 검출센서로부터 검출된 질소산화물 정량정보에 기반하여, 검출된 질소산화물 정량정보에 대응되는 환원제의 양이 상기 SCR 반응기에 공급되도록 상기 환원제 공급장치를 제어하며,
상기 제어수단은 기준온도 하에서의 질소산화물의 양에 따른 환원제 공급량 정보를 저장하는 것을 특징으로 하는 SCR 시스템의 배기가스 온도 및 환원제 공급량 제어장치.
2. The exhaust gas purification apparatus according to claim 1, wherein the control means controls the amount of nitrogen oxide contained in the exhaust gas to be supplied to the SCR reactor based on the nitrogen oxide quantitative information detected from the nitrogen oxide detection sensor Controlling the reducing agent supply device so that the amount of the reducing agent is supplied to the SCR reactor,
Wherein the control means stores the reducing agent supply amount information according to the amount of nitrogen oxide under the reference temperature.
제 1 항에 있어서, 상기 SCR 반응기에 유입되는 배기가스의 기준온도는 280∼320℃로 제어되는 것을 특징으로 하는 SCR 시스템의 배기가스 온도 및 환원제 공급량 제어장치.The apparatus according to claim 1, wherein the reference temperature of the exhaust gas flowing into the SCR reactor is controlled to 280 to 320 캜.
KR1020140094253A 2014-07-24 2014-07-24 Apparatus for controlling temperature of exhaust gas and supplying of reducing agent in selective catalytic reduction system KR20160012612A (en)

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Publication number Priority date Publication date Assignee Title
KR20170110929A (en) 2016-03-24 2017-10-12 현대중공업 주식회사 Selective catalytic reduction system of low pressure and control method thereof
KR20210012210A (en) * 2019-07-24 2021-02-03 현대제철 주식회사 System of selective catalytic reduction and methods of controlling the same
KR20230039885A (en) * 2021-09-14 2023-03-22 한국생산기술연구원 Active nitrogen oxide precursor reduction system for fine dust reduction and nitrogen oxide reduction method using the same

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KR20150062676A (en) 2013-11-29 2015-06-08 현대중공업 주식회사 Apparatus and Method for Urea Provision Control in Selective Catalytic Reduction System

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KR20150062676A (en) 2013-11-29 2015-06-08 현대중공업 주식회사 Apparatus and Method for Urea Provision Control in Selective Catalytic Reduction System

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170110929A (en) 2016-03-24 2017-10-12 현대중공업 주식회사 Selective catalytic reduction system of low pressure and control method thereof
KR20210012210A (en) * 2019-07-24 2021-02-03 현대제철 주식회사 System of selective catalytic reduction and methods of controlling the same
KR20230039885A (en) * 2021-09-14 2023-03-22 한국생산기술연구원 Active nitrogen oxide precursor reduction system for fine dust reduction and nitrogen oxide reduction method using the same

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