CN101994553B - 尿素喷射控制方法 - Google Patents

尿素喷射控制方法 Download PDF

Info

Publication number
CN101994553B
CN101994553B CN201010257239.9A CN201010257239A CN101994553B CN 101994553 B CN101994553 B CN 101994553B CN 201010257239 A CN201010257239 A CN 201010257239A CN 101994553 B CN101994553 B CN 101994553B
Authority
CN
China
Prior art keywords
urea
flow
spray
control system
flexible
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201010257239.9A
Other languages
English (en)
Other versions
CN101994553A (zh
Inventor
V·司脱特斯
S·C·怀亚特
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Engine Intellectual Property Co LLC
Original Assignee
International Engine Intellectual Property Co LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Engine Intellectual Property Co LLC filed Critical International Engine Intellectual Property Co LLC
Publication of CN101994553A publication Critical patent/CN101994553A/zh
Application granted granted Critical
Publication of CN101994553B publication Critical patent/CN101994553B/zh
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • 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
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1812—Flow rate
    • 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

Landscapes

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

Abstract

一种尿素喷射控制系统(10)，用于具有与SCR催化剂(18)流体连通的尾气管线(16)以及将尿素喷射入尾气管线的尿素喷射器(14)的运载工具，所述尿素喷射控制系统(10)包括用于控制尿素喷射器处的尿素喷射流量的控制器(12)。控制器(12)将优选尿素流量(20)与通过可变通流量计算器确定的可变通的尿素流量(22)进行比较。控制器(12)选择优选尿素流量(20)和可变通的尿素流量(22)中的最小值，并控制尿素喷射器(14)在所述最小值下喷射尿素。

Description

尿素喷射控制方法
技术领域
本发明总地涉及SCR系统，更具体地涉及用于将尿素喷射入SCR系统的控制方法。
背景技术
通常，尿素选择性催化还原系统(尿素SCR系统)用来还原来自内燃机的氮氧化物。尿素SCR系统依赖于将32.5％亲水尿素溶液喷射入SCR催化剂上游的运载工具尾气管线中。在SCR催化剂中，尿素分解，而从催化剂中排出的是N2、H2O和CO2。
在喷射时，尿素溶液温度一般接近室温并较佳地低于60℃。SCR反应需要气态氨。为了生产气态氨，必须将喷射入的尿素溶液较佳地加热至150℃，以使水蒸发并使剩下的固态尿素分解为氨和异氰酸。如果蒸发和分解不彻底，由于没有充分可用的还原剂，SCR催化剂性能降低。此外，尿素的固态沉淀物可能形成在尾气管道内，这可能造成SCR系统的彻底失效。
蒸发和分解所需的热量是通过尾气提供的。在低尾气温度下，可用热量对尿素溶液的彻底蒸发和分解来说可能是不足的。
当前，SCR系统受到施加硬性温度极限的策略控制。如果尾气温度低于设定极限，典型为150-250℃，则尿素喷射停止。如果气体温度高于设定极限，则通过基于尾气中的NOx流量、SCR催化剂的性能特征以及SCR催化剂的氨储藏能力的控制策略来确定尿素喷射速度。
然而，设置硬性温度极限是不理想的。如果温度极限设置地太低，可能导致糟糕的蒸发和沉淀产生。如果温度极限设定地太高，则控制系统就不能利用可用于SCR反应的完整温度范围，当温度总体太低且频繁地低于预设极限时，对过渡工况而言能够利用SCR反应可用的完整温度范围是尤其重要的。这种操作的一个例子是时走时停或城市交通工具驱动循环。
发明内容
具有与SCR催化剂流体连通的尾气管线以及将尿素喷射入尾气管线的尿素喷射器的运载工具的尿素喷射控制系统包括用于控制尿素喷射器处的尿素喷射流量的控制器。控制器将优选尿素流量与通过可变通流量计算器确定的可变通尿素流量进行比较。控制器选择优选尿素流量和可变通尿素流量中的最小值，并控制尿素喷射器以该最小值来喷射尿素。
附图说明
图1是将尿素喷射入SCR系统的控制方法的示意图。
具体实施方式
参见图1，对最大容许尿素溶液喷射速率(Furea_max)的可变通极限根据尾气流量(Fexh)和温度(Texh)限制尿素给药速率，该限制规则是凭经验确定的。当前可变通极限与现有技术的硬性极限相反，在现有技术中尿素喷射当尾气温度不落在温度极限内时停止。
在尿素喷射控制系统10中，控制器12控制尿素喷射器14处的尿素流量，尿素喷射器14将尿素喷射入运载工具的尾气管16而在SCR催化剂18的上游分解。控制器12具有优选值20和可变通值计算器22。优选值20是通过优选SCR催化剂性能所需的氨浓度确定的，并可包括例如特定SCR系统的NOx流量、NOx转换要求、SCR动力、氨储藏状态和/或氨储藏需求之类的因素。典型地，优选值20不将尿素溶液蒸发和尿素分解的条件考虑在内。
可变通值计算器22接收尾气流量(Fexh)和温度(Texh)的输入值。在某些场合下，例如移动运载工具配有内燃机的场合，尾气流量测量值不可得，而是可从进气流量和燃料流量的值计算出，或使用来自内燃机控制单元的其它可用参数计算出。例如，氧浓度数据可通过一个或多个氧传感器或NOx传感器获得，其中一个传感器一般位于SCR催化剂18的上游并用来对SCR控制器12作前反馈，而另一传感器位于尾管中并用来反馈入SCR控制器12。燃料流量数据可用来计算尾气流量。
接着，使用下面公式计算最大容许尿素流量Furea_max：
Furea_max＝A*Fexh(Texh-Tmin)
其中，Furea_max＝尿素溶液流量
Fexh＝尾气流量
Texh＝尾气温度
Tmin＝截止温度
A＝系数
系数A和Tmin可针对给定的SCR系统配置凭经验确定或校正。预期经验校正可能需要将特定SCR系统的独特参数考虑在内，例如热损耗、尿素溅射参数、发生尿素溶液喷射的SCR系统部分的几何形状、蒸发率以及发生尾气流的分解与混合的SCRF系统部分的几何形状。
系数A和Tmin也可从如下的基础热力学关系中得到。当喷射入SCR催化剂18上游的运载工具尾气管线时，尿素为32.5％亲水溶液。喷射的尿素溶液比尾气的温度(Texh)更低，因此能量从尾气转移至尿素溶液。作为能量转移的结果，尾气的温度(Texh)降低。所转移的能量用来加热尿素溶液、使水蒸发、使尿素蒸发并分解尿素：(NH2)2CO→NH3+HNCO。还假设HNCO水解缓慢，并且它对能量平衡的影响可忽略不计。
在最终平衡状态下，全部组成部分具有相同的温度，并且最终温度必须确保尿素的蒸发和分解。另外，尿素分解开始的理论值是132.7℃，并且尿素分解在大约130-180℃的范围内时——较佳在大约150℃时——最大。由于对管壁的热损耗，可能需要安全余量。因此，推荐的尿素给药速率(Furea)必须导致总是≥150℃的最终混合物温度(Tmin)，这样就可提供高于132.7℃的理论值的安全因素。
尿素溶液的最大流量(Furea_max)可使用如下简化方程从尾气流和尾气温度值的任意给定组合的能量平衡中计算得到：
Furea_max＝0.388Fexh(Texh-Tmin)
其中Furea_max＝尿素溶液流量，克/小时
Fexh＝尾气流量，千克/小时
Texh＝尾气温度，℃
Tmin＝截止温度，℃
应当理解，不同系数值工作在不同的单元。另外，更精确的分析可能导致略为不同的值，不是正好为0.388，而是较佳地在大约0.35至0.45的范围内。考虑到在任何情形下，用在运载工具中的系数应当使用试验数据凭经验调整和校正。
在计算出Furea_max后，在选择器24将流至尾气管16的尿素流量(Furea)选择为Furea_max和优选流量(Foptimum)的最小值。控制器12控制尿素喷射器14以在由选择器24确定的流量(Furea)下喷射尿素。如此，喷射流量(Furea)通过控制系统10针确定为对SCR催化剂性能最优的。
当前控制系统10对尿素喷射速率(Furea)进行微调。这种微调导致更好地利用仅将有限量的尿素安全喷射入的温度范围，并有助于防止尾气系统中不合需的尿素沉淀。所提出的本发明可用作附加于任何已知尿素喷射方法的安全装置并可实现在任何产业标准控制器中。
本发明可以其它具体形式体现而不脱离其精神或实质特征。所描述的实施例无论怎样都应当认为仅是示例性而非限定性的。因此，本发明的范围由所附权利要求书而不是前面的说明书指出。落在权利要求书的含义和等效范围的所有变化均涵盖在其范围内。

Claims (8)

1.一种尿素喷射控制系统，用于与SCR催化剂流体连通的尾气管线以及用于将尿素喷射入所述尾气管线的尿素喷射器，所述尿素喷射控制系统包括：
用于控制所述尿素喷射器处的尿素喷射的流量的控制器，其中所述控制器将预确定的尿素流量与通过可变通流量计算器确定的可变通的尿素流量进行比较，所述控制器选择所述预确定的尿素流量和可变通的尿素流量的最小值，并控制所述尿素喷射器以所述最小值来喷射尿素；所述可变通流量计算器接收尾气流量和尾气温度的输入；
所述可变通流量计算器通过下面方程确定所述可变通的尿素流量：
Furea_max＝A*Fexh(Texh–Tmin)
其中，Furea_max=可变通的尿素流量，克/小时
Fexh＝尾气流量,千克/小时
Texh＝尾气温度,°C
Tmin＝截止温度,°C
A＝系数。
2.如权利要求1所述的尿素喷射控制系统，其特征在于，所述系数A在0.35和0.45之间。
3.如权利要求1所述的尿素喷射控制系统，其特征在于，Tmin在130℃-180℃的范围。
4.如前述权利要求中的任何一项所述的尿素喷射控制系统，其特征在于，所述可变通流量计算器接收进口空气流、燃料流量、氧浓度和燃料流量中的至少一个量的输入以计算尾气流量和尾气温度。
5.如权利要求1所述的尿素喷射控制系统，其特征在于，所述控制器还包括用于选择预确定的尿素流量和可变通尿素流量的最小值并控制所述尿素喷射器以所述最小值来喷射尿素的选择器。
6.一种尿素喷射控制系统，用于与SCR催化剂流体连通的尾气管线以及用于将尿素喷射入所述尾气管线的尿素喷射器，所述尿素喷射控制系统包括：
用于控制所述尿素喷射器处的尿素喷射的流量的控制器，其中所述控制器将预确定的尿素流量与通过可变通流量计算器确定的可变通的尿素流量进行比较，所述可变通流量计算器接收尾气流量和尾气温度的输入；以及
在所述控制器处的选择器，所述选择器选择预确定的尿素流量和可变通的尿素流量中的最小值，其中所述尿素喷射器由选择器作出指令来以所述最小值喷射尿素；所述可变通流量计算器通过下面方程确定可变通的尿素流量：
Furea_max＝A*Fexh(Texh－Tmin)
其中，Furea_max=可变通的尿素流量，克/小时
Fexh＝尾气流量,千克/小时
Texh＝尾气温度,°C
Tmin＝截止温度,°C
A＝系数。
7.如权利要求6所述的尿素喷射控制系统，其特征在于，所述系数A在0.35和0.45之间。
8.如权利要求6所述的尿素喷射控制系统，其特征在于，Tmin在130℃-180℃的范围内。
CN201010257239.9A 2009-08-14 2010-08-13 尿素喷射控制方法 Active CN101994553B (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/541,446 US20110036078A1 (en) 2009-08-14 2009-08-14 Method for urea injection control
US12/541,446 2009-08-14

Publications (2)

Publication Number Publication Date
CN101994553A CN101994553A (zh) 2011-03-30
CN101994553B true CN101994553B (zh) 2015-05-06

Family

ID=42989582

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201010257239.9A Active CN101994553B (zh) 2009-08-14 2010-08-13 尿素喷射控制方法

Country Status (5)

Country Link
US (1) US20110036078A1 (zh)
EP (1) EP2295753B1 (zh)
JP (1) JP2011038521A (zh)
CN (1) CN101994553B (zh)
BR (1) BRPI1002968A2 (zh)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2434741T3 (es) * 2009-12-23 2013-12-17 Fpt Motorenforschung Ag Método y dispositivo para controlar un convertidor catalítico SCR de un vehículo
US20140000247A1 (en) * 2011-03-14 2014-01-02 International Engine Intellectual Property Company Llc Model-based system and method for mitigating diesel emission fluid deposits
JP5698593B2 (ja) * 2011-04-21 2015-04-08 日立建機株式会社 建設機械の制御装置
GB2500194A (en) * 2012-03-12 2013-09-18 Jaguar Cars Exhaust temperature control during SCR injection events
US20140127097A1 (en) * 2012-11-02 2014-05-08 International Engine Intellectual Property Company, Llc Ammonia flow control
SE1350273A1 (sv) * 2013-03-07 2014-09-08 Scania Cv Ab Anordning och förfarande för val av maximal reduktionsmedelsdosering vid ett SCR-system för avgasrening
FR3031357B1 (fr) * 2015-01-07 2017-07-14 Peugeot Citroen Automobiles Sa Procede de traitement des oxydes d'azote issus d'un moteur a combustion interne
KR101684135B1 (ko) 2015-06-26 2016-12-08 현대자동차주식회사 Scr 시스템의 고장진단방법
CN106368772B (zh) * 2016-11-04 2019-03-01 吉林大学 Scr系统尿素喷射控制方法
US11027237B2 (en) 2019-07-19 2021-06-08 American Electric Power Company, Inc. Direct injection of aqueous urea

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6173568B1 (en) * 1997-09-16 2001-01-16 Siemens Aktiengesellschaft Method and device for operating an internal combustion engine operating with an excess of air
CN201013431Y (zh) * 2007-02-12 2008-01-30 潍柴动力股份有限公司 大排量发动机scr后处理装置
WO2008126118A1 (en) * 2007-04-12 2008-10-23 Politecnico Di Milano Apparatus and process for reducing the content of nitrogen oxides in exhaust gases of combustion systems
CN101328827A (zh) * 2003-10-02 2008-12-24 日产柴油机车工业株式会社 发动机的排气净化装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR950012137B1 (ko) * 1989-02-02 1995-10-14 닛뽄 쇼크바이 카가꾸 고오교오 가부시기가이샤 디이젤엔진 배기가스 중의 질소산화물 제거방법
US6427439B1 (en) * 2000-07-13 2002-08-06 Ford Global Technologies, Inc. Method and system for NOx reduction
US6701707B1 (en) * 2002-09-04 2004-03-09 Ford Global Technologies, Llc Exhaust emission diagnostics
US6941746B2 (en) * 2002-11-21 2005-09-13 Combustion Components Associates, Inc. Mobile diesel selective catalytic reduction systems and methods
EP1672192B1 (en) * 2004-12-18 2007-08-08 Haldor Topsoe A/S Method for controlling injection of reducing agent in exhaust gas from a combustion engine
GB0614445D0 (en) * 2006-07-20 2006-08-30 Ricardo Uk Ltd Control of selective catalytic reduction
US20080087006A1 (en) * 2006-10-11 2008-04-17 International Engine Intellectual Property Company , Llc Tailpipe exhaust gas mixer and method
US20080289320A1 (en) * 2007-05-24 2008-11-27 International Engine Intellectual Property Company, Llc Substance dispenser for treating exhaust gas and method
JP4445000B2 (ja) * 2007-11-21 2010-03-31 株式会社日本自動車部品総合研究所 排気浄化装置
US8074445B2 (en) * 2008-04-30 2011-12-13 Cummins Ip, Inc. Apparatus, system, and method for reducing NOx emissions on an SCR catalyst

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6173568B1 (en) * 1997-09-16 2001-01-16 Siemens Aktiengesellschaft Method and device for operating an internal combustion engine operating with an excess of air
CN101328827A (zh) * 2003-10-02 2008-12-24 日产柴油机车工业株式会社 发动机的排气净化装置
CN201013431Y (zh) * 2007-02-12 2008-01-30 潍柴动力股份有限公司 大排量发动机scr后处理装置
WO2008126118A1 (en) * 2007-04-12 2008-10-23 Politecnico Di Milano Apparatus and process for reducing the content of nitrogen oxides in exhaust gases of combustion systems

Also Published As

Publication number Publication date
EP2295753A1 (en) 2011-03-16
BRPI1002968A2 (pt) 2012-04-17
CN101994553A (zh) 2011-03-30
EP2295753B1 (en) 2012-06-20
US20110036078A1 (en) 2011-02-17
JP2011038521A (ja) 2011-02-24

Similar Documents

Publication Publication Date Title
CN101994553B (zh) 尿素喷射控制方法
US7690193B2 (en) Procedure and device to control a reducing agent generation system
CN101994556B (zh) 用于控制选择性催化还原系统的系统和方法
CN101418713B (zh) 喷射还原剂的方法
CN109404108B (zh) 一种用于柴油机NOx排放值的计算方法及装置
KR101601520B1 (ko) 선택적 촉매 환원 시스템 및 선택적 촉매 환원 방법
JP7149852B2 (ja) 選択的触媒還元システム及びこれを備えた動力装置
KR101497831B1 (ko) 선택적 촉매 환원 시스템을 포함한 동력 장치
EP3341597B1 (en) Method and system for treatment of an exhaust gas stream
CN107109990B (zh) 选择性催化还原系统及包括其的动力装置
KR20180041197A (ko) 배기가스 스트림 처리를 위한 방법 및 배기 처리 시스템
US9084968B2 (en) After treatment device of engine
CN103069121B (zh) 控制引入内燃机排气管线中的还原剂量的设备和方法
KR102107910B1 (ko) 선택적 무촉매 환원 및 선택적 촉매 환원 복합 시스템
KR102367278B1 (ko) 선택적 촉매 환원 시스템
KR101662431B1 (ko) 선택적 촉매 환원 시스템을 포함한 동력 장치
KR200474568Y1 (ko) 선택적 촉매 환원 반응용 우레아 가수분해 장치
US20160281563A1 (en) Exhaust system for an internal combustion engine of a motor vehicle and method for operating an exhaust system
KR101902345B1 (ko) 선택적 촉매 환원 시스템 및 이를 포함한 동력 장치
CN111577430A (zh) 响应时间短的氨气生成计量喷射装置及喷射率控制系统
JP4959231B2 (ja) 脱硝装置および脱硝方法
KR20180024745A (ko) 환원제 공급 시스템
KR102466788B1 (ko) 선택적 촉매 환원 시스템
KR20190002846A (ko) 선택적 촉매 환원 시스템
KR101601458B1 (ko) 선택적 촉매 환원 시스템 및 선택적 촉매 환원 방법

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant