CN107091138A - 发动机废气的scr后处理 - Google Patents

发动机废气的scr后处理 Download PDF

Info

Publication number
CN107091138A
CN107091138A CN201710086415.9A CN201710086415A CN107091138A CN 107091138 A CN107091138 A CN 107091138A CN 201710086415 A CN201710086415 A CN 201710086415A CN 107091138 A CN107091138 A CN 107091138A
Authority
CN
China
Prior art keywords
def
treatment system
engine exhaust
engine
metering
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.)
Pending
Application number
CN201710086415.9A
Other languages
English (en)
Inventor
N·辛格
D·W·高斯比
B·J·阿德尔曼
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 CN107091138A publication Critical patent/CN107091138A/zh
Pending legal-status Critical Current

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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • F01N3/2026—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect
    • 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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust 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
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/027—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic heating means
    • 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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • 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
    • 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
    • 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
    • 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

Landscapes

  • 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

在小于和大于DEF计量阈值温度的发动机废气温度下将还原剂计量到SCR催化器上游的发动机废气后处理系统中，以使催化器有效还原NOx而不会在小于DEF计量阈值温度的发动机废气温度下产生会损害后处理系统有效性的不希望的反应产物。

Description

发动机废气的SCR后处理
技术领域
本申请要求2016年2月17日提交的美国临时专利申请序列号第62/296,302号的优先权。该申请全文以参见的方式纳入本文。
本公开涉及在内燃机中通过烃燃料的燃烧产生的废气的后处理，具体是通过选择性催化还原对发动机废气中的氮氧化物(NOx)的催化还原。
背景技术
选择性催化还原(SCR)是用于还原发动机废气中的NOx的已知技术。目前制造的由内燃机(例如柴油发动机)推进并且使用SCR作为废气后处理策略的一部分的车辆携带柴油机废气流体(DEF)的机载源，DEF从其被计量以控制量进入SCR催化器上游的发动机废气系统。DEF是标准化的尿素水溶液，其包含32.5％尿素和67.5％去离子水。使用DEF的发动机废气的SCR后处理的化学是有据可查的。当DEF被引入足够高温的发动机废气中时，水蒸发并且尿素分解以产生氨。在催化剂存在下进行的反应将NOx还原为氮气、二氧化碳和水。
发明内容
某些机动车辆有时可以以使得使用DEF用于发动机废气的SCR后处理的方式运行是不希望的。当不使用SCR后处理时，废气中的NOx大部分保持未处理，因此从尾管流出并进入周围大气。
可以发生这种情况的一个示例是在废气温度保持低于DEF计量阈值的同时在冷起动之后的发动机的操作期间，这设定将DEF引入后处理系统中的最小温度要求。在允许将DEF引入后处理系统中之前要求废气温度达到剂量阈值温度避免DEF中的尿素的不完全水解。尿素的不完全水解产生除氮、 二氧化碳和水以外的反应产物，这将损害后处理系统。通过这种反应产物堵塞后处理系统是在相当短的时间内通过机动车辆的重复冷启动操作可能发生的一个已知的示例。
本公开涉及用于在机动车辆的冷启动操作期间实现发动机废气的有效SCR后处理的解决方案，使得在冷起动操作期间可以比在当前时间在机动车辆中显著更早地处理NOx，其使用DEF用于NOx的选择性催化还原。
本发明的总体方面涉及一种内燃机，包括：发动机废气后处理系统，包括：用于通过选择性催化还原来还原发动机废气中的NOx的催化器，还原剂源，以及控制器，所述控制器通过在小于DEF计量阈值温度的废气温度下沉积和收集在后处理系统的部件上而在小于和大于所述DEF计量阈值温度的发动机废气温度下将还原剂计量到所述催化器上游的所述后处理系统中，以使所述催化器有效地还原NOx，而不产生会损害后处理系统的有效性的反应产物。
另一个一般方面涉及一种用于通过选择性催化还原来减少通过发动机废气后处理系统的发动机废气流中的NOx的方法。
该方法包括在小于和大于所述DEF计量阈值温度的发动机废气温度下而将还原剂计量到所述催化器上游的后处理系统中，以在小于和大于所述DEF计量阈值温度的发动机废气温度下使所述催化器有效地还原NOx，而不会通过在小于DEF计量阈值温度的发动机废气温度下沉积和收集在后处理系统的部件上而产生会损害后处理系统的有效性的反应产物。
上述发明内容通过参考作为本公开的一部分的以下附图在下面的具体实施方式中给出的公开内容的进一步细节。
附图说明
图1是机动车辆中的内燃机的废气后处理系统的第一实施例的示意图。
图2是用于解释后处理系统的操作的曲线图。
图3是机动车辆中的内燃机的废气后处理系统的第二实施例的示意图。
图4是图3的一部分的分解立体图。
图5是机动车辆中的内燃机的废气后处理系统的第三实施例的示意图。
具体实施方式
图1示意性地示出具有发动机废气后处理系统的第一实施例12的内燃机10。发动机10代表推进机动车辆例如像公共汽车或货车的商用职业车辆的柴油发动机。
来自发动机废气歧管14的发动机废气在通过后处理系统12的废气流动路径的入口16处进入后处理系统12，并沿着流动路径流动以在出口18处离开，该出口18通向尾管(未示出)。在沿着流动路径通过期间，发动机废气通过一个或多个处理元件，其中一个是通过选择性催化还原(SCR)还原发动机废气中的NOx的催化器20。在催化器20存在的化学还原NOx的还原剂通过位于催化器20上游的喷射器22引入到废气流动路径中。喷射器22是喷射器/混合器组件的一部分，其还包括在喷射器22下游的混合器24，用于促进还原剂与废气的混合，以在混合物沿催化器20的表面通过之前适当地分配。
后处理系统12可包含的其它废气处理元件包括柴油机氧化催化器(DOC)和柴油颗粒过滤器(DPF)中的一个或两者，其在图1中由附图标记26表示为仅DOC、仅DPF、或者DPF和DOC两者。
控制器28根据各种废气参数(例如NOx、温度和压力)控制还原剂到废气流动路径中的引入，用于控制从出口18出来的废气中的NOx浓度。这些参数由后处理系统12中各个位置处的各传感器测量。NOx传感器30、32分别位于入口16和出口18附近。各温度传感器34、36位于催化器20之前和之后，压力传感器38、40也如此。温度传感器42位于入口16附近。
当发动机10是用于推进机动车辆的发动机时，用于后处理系统12的还原剂从机动车辆机载的氨存储箱44和柴油机废气流体(DEF)存储箱46提供。每种还原剂从后处理系统12中的相应储存箱通过相应的计量阀48、50输送，计量阀48、50由控制器28控制以计量控制量的还原剂到喷射器22。每种还原剂的使用取决于废气温度，并且计量的还原剂的量取决于废气中的NOx 浓度。氨可以以已知的方式储存在储存箱44内，并作为由喷射器22喷入的气体释放。DEF作为尿素溶液储存在储存箱46内，如前面提到的那样。
如先前所解释的，当废气温度小于DEF计量阈值温度时，例如当发动机在冷启动之后加热时，不使用DEF作为还原剂，因为其与未充分加热的废气的反应产生反应产物，该反应产物可以沉积在后处理系统中并积聚到堵塞系统的点。换句话说，尿素不完全水解。在发动机10的冷启动操作期间未处理废气的NOx导致离开废气歧管14的“发动机排出”废气通过后处理系统12并通过出口16进入周围环境。
通过计量从车载氨存储箱44到喷射器22的氨，当废气温度小于DEF计量阈值温度时，可以对废气进行NOx处理。一旦废气温度变得大于DEF计量阈值温度，就停止使用氨，并且通过DEF计量阀50计量来自储箱46的DEF，而不产生导致堵塞的不期望的产物。这样，控制器28在小于和大于DEF计量阈值温度的发动机废气温度下而将还原剂计量到后处理系统12中，以使催化器20有效地还原NOx，而不会通过在小于DEF计量阈值温度的废气温度下沉积和收集在后处理系统的部件上而产生损害后处理系统12的有效性的反应产物。
图2示出了职业车辆中的发动机的冷起动操作的示例。当车辆以频繁的起动和停止操作时，与在没有任何停止的情况下操作相比，发动机需要较长的时间来加热到正常操作温度。在图2的底部的迹线52表示作为时间函数的车辆速度。迹线52包括峰值54和谷值56的序列，谷值56表示车辆停止，发动机处于运行或关闭状态。迹线58表示废气温度。水平线60表示DEF计量阈值温度。迹线58和线60示出在该示例中在发动机冷启动之后约1000秒内不应计量DEF。
图3示意性地示出具有发动机废气后处理系统的第二实施例62的内燃机10。图3中与图1中已经描述的部件共同的部件在两图中由相同的附图标记标示。后处理系统62与后处理系统12的不同之处在于省略了氨存储箱44和氨计量阀46，并且在喷射器22的下游，在废气流动路径中在混合器24和催化器20之间的位置增加电加热器64，从而位于催化器20的上游和喷射器22的下游。
图4示出加热器64的细节。在功能实施例中，加热器64可以具有其自身的壳体，该壳体包括内覆盖件66和外覆盖件68，而不是如图3中示意性地示出的那样放置。当覆盖件66、68装配在一起时，电加热元件70被支承在加热器壳体内。来自混合器24的废气和DEF的混合物通过入口进入加热器壳体，并通过出口离开壳体到达催化器20。商业电加热器的实例是由大陆电气公司(Continental Emitec GmbH)出售的商标为的EMICAT的电加热器。
电加热器64的操作由控制器28通过位于加热器外壳外部的继电器(未示出)控制。来自继电器的电导体通过配件72进入加热器壳体以与加热元件70连接。
加热器64用于加热通过后处理系统62的发动机废气，使得废气流到达DEF计量阈值温度60比如果进入后处理系统62的入口16的废气的温度仅是用于确定何时DEF注入可以启动的温度时显著更快。这在图2中图示地证实，迹线74示出了在该示例中早680秒达到DEF计量阈值60。
加热元件70包括发动机废气流过的表面，并且其可选地包含用于通过选择性催化还原来还原发动机废气中的NOx的催化涂层。包含催化涂层的加热元件的表面的表面积小于发动机废气在流经加热器64之后所流过的催化器20的表面积。因为加热器的催化涂层的表面积为小于催化器20的表面积，加热器可用于提供额外的NOx还原而不增加催化器20的表面积。
图5示意性地示出具有发动机废气后处理系统的第三实施例76的内燃机10。图5中与图1和3中已经描述的部件共同的部件在两图中由相同的附图标记标示。后处理系统76与后处理系统76的不同之处仅在于，电加热器64重新定位在由附图标记26表示的元件之前。
加热器64的这种放置允许废气流过一个或多个元件26以更快地加热它或它们，并且该考虑在一些后处理策略中可能是有用的，即使其意味着催化器20不被同样快速加热。图5还示出了在涡轮增压型发动机10中直接来自涡轮增压器78的出口的废气。
图2示出了作为在150℃和200℃之间的范围内的恒定温度的DEF计量温度(线60)。线60的位置旨在表示温度或温度范围，该温度或温度范围将发生尿素的完全水解的较高温度区域与在尿素的完全水解是有问题的较 低温度区域分界。相信在这时，190℃和200℃之间的温度范围可以提供适当的分界。

Claims (8)

1.一种用于通过选择性催化还原减少通过发动机废气后处理系统的发动机废气流中的NOx的方法，所述方法包括:
在小于和大于DEF计量阈值温度的发动机废气温度下将还原剂计量到所述催化器上游的后处理系统中，以在小于和大于所述DEF计量阈值温度的发动机废气温度下使所述催化器有效地还原NOx，而不会通过在小于DEF计量阈值温度的废气温度下沉积和收集在后处理系统的部件上而产生会损害后处理系统的有效性的反应产物。
2.如权利要求1所述的方法，其特征在于，将还原剂计量到催化器上游的后处理系统中包括将柴油机废气流体(DEF)计量到通过所述后处理系统的发动机废气流中，并且在催化器上游操作电加热器，以在发动机废气具有小于DEF计量阈值温度的温度时加热发动机废气。
3.如权利要求2所述的方法，其特征在于，计量DEF进入所述后处理系统包括在加热器上游的位置处将DEF引入通过所述后处理系统的发动机废气流中。
4.如权利要求3所述的方法，其特征在于，包括通过流过加热器表面发动机废气流的选择性催化还原来还原发动机废气中的NOx，所述加热器包含用于通过选择性催化还原来还原发动机废气中的NOx的催化剂涂层。
5.如权利要求4所述的方法，其特征在于，包括通过流过加热器表面的发动机废气流的选择性催化还原来还原发动机废气中的NOx，所述加热器包含用于通过选择性催化还原还原发动机废气中NOx的催化剂涂层，并且其表面积小于发动机废气在已经流过加热器之后所流过的催化器的表面积。
6.如权利要求2所述的方法，其特征在于，还包括在所述加热器下游的位置将DEF引入通过所述后处理系统的发动机废气流。
7.如权利要求1所述的方法，其特征在于，在小于和大于DEF计量阈值温度的发动机废气温度下，将还原剂计量到催化器上游的后处理系统中包括在小于DEF计量阈值温度的发动机废气温度下将来自氨源的氨而不是来自DEF源的DEF计量到所述后处理系统中，并且在大于DEF计量阈值温度的发动机废气温度下将来自DEF源的DEF而不是来自氨源的氨计量到所述后处理系统。
8.如权利要求7所述的方法，其特征在于，包括控制氨计量阀并控制DEF计量阀，控制所述氨计量阀以在小于所述DEF计量阈值温度的发动机废气温度下将氨计量到所述后处理系统中，控制所述DEF计量阀以在大于所述DEF计量阈值温度的发动机废气温度下将DEF计量到所述后处理系统中。
CN201710086415.9A 2016-02-17 2017-02-17 发动机废气的scr后处理 Pending CN107091138A (zh)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201662296302P 2016-02-17 2016-02-17
US62/296,302 2016-02-17
US15/298,438 2016-10-20
US15/298,438 US20170234189A1 (en) 2016-02-17 2016-10-20 Scr after-treatment of engine exhaust gas

Publications (1)

Publication Number Publication Date
CN107091138A true CN107091138A (zh) 2017-08-25

Family

ID=58046557

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710086415.9A Pending CN107091138A (zh) 2016-02-17 2017-02-17 发动机废气的scr后处理

Country Status (3)

Country Link
US (1) US20170234189A1 (zh)
EP (1) EP3208438A1 (zh)
CN (1) CN107091138A (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112189083A (zh) * 2018-03-29 2021-01-05 埃米索尔公司 控制尿素混合器以减少来自燃烧发动机的NOx排放的方法和装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10961887B2 (en) * 2019-07-03 2021-03-30 Deere & Company Integrated reductant mixer and heater apparatus for exhaust treatment systems
FR3117161A1 (fr) 2020-12-04 2022-06-10 Faurecia Systemes D'echappement Dispositif de post traitement de gaz d’échappement

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK0894523T3 (da) * 1997-07-28 2004-02-09 Siemens Ag Anvendelse af en statisk mikser som katalysator til hydrolyse og anvendelse deraf i et røggasrør i et forbrændingssystem
JP2010265862A (ja) * 2009-05-18 2010-11-25 Toyota Industries Corp 排気ガス浄化装置
US20130239554A1 (en) * 2012-03-19 2013-09-19 GM Global Technology Operations LLC Exhaust gas treatment system having a solid ammonia gas producing material
US9429060B2 (en) * 2013-10-28 2016-08-30 Cummins Emission Solutions Inc. Systems and methods for control of engine NOx emissions using liquid and dry reductant sources
WO2016010558A1 (en) * 2014-07-18 2016-01-21 Cummins Emission Solutions, Inc. Exhaust after-treatment with dual closed-loop reductant dosers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112189083A (zh) * 2018-03-29 2021-01-05 埃米索尔公司 控制尿素混合器以减少来自燃烧发动机的NOx排放的方法和装置
CN112189083B (zh) * 2018-03-29 2022-02-25 埃米索尔公司 控制尿素混合器以减少来自燃烧发动机的NOx排放的方法和装置

Also Published As

Publication number Publication date
US20170234189A1 (en) 2017-08-17
EP3208438A1 (en) 2017-08-23

Similar Documents

Publication Publication Date Title
CN107091137A (zh) 发动机废气的scr后处理
EP3134624B1 (en) Exhaust treatment system and method for treatment of an exhaust stream
CN110857642B (zh) 维持高被动烟炱氧化同时使用多给料位置进行def给料
CN102400749B (zh) 排气后处理系统及操作方法
EP2843225B1 (en) Intake manifold having a mixing duct and an EGR flow measurement system integrally formed into the intake manifold
CN104395572A (zh) 排气净化装置、液体还原剂或者其前体的解冻方法
CN101769190B (zh) 还原剂喷射器的热保护系统
EP2813678B1 (en) An exhaust gas sampling device
EP2743471B1 (en) A reductant delivery system
US9945278B2 (en) Exhaust gas mixer
CN107091138A (zh) 发动机废气的scr后处理
CN111219231B (zh) 具有用于低温scr的氧化部件旁通的排气后处理系统
EP3106641B1 (en) Catalytic device detection system
US20170074140A1 (en) Gas/liquid mixing device for exhaust aftertreatment
US11585259B2 (en) Method for adjusting the loading of a particulate filter
EP3341598B1 (en) Exhaust treatment system and method for treatment of an exhaust gas stream
EP3784886B1 (en) Method and system for control of an activation of at least one liquid sensitive sensor
US11384667B2 (en) Exhaust aftertreatment system with heated dosing control
US20140360159A1 (en) Precipitation cover for an exhaust system
JP2017122396A (ja) 添加制御装置
WO2023235314A2 (en) Aftertreatment system
WO2023081168A2 (en) Exhaust gas aftertreatment system
Sharma et al. An approach to enhance selective catalytic reduction system
CN105545511A (zh) 内燃机的控制装置
SE540691C2 (sv) Avgasbehandlingssystem och förfarande för behandling av en avgasström

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20170825