CN102309921B - 废气处理系统及废气处理方法 - Google Patents
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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
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
- F01N3/0885—Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
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- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- 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
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0842—Nitrogen oxides
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- 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
- F01N2240/30—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a fuel reformer
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- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/05—Systems for adding substances into exhaust
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- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- 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
- F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
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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
- 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
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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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0421—Methods of control or diagnosing using an increment counter when a predetermined event occurs
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0422—Methods of control or diagnosing measuring the elapsed time
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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
- 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
- F01N2900/10—Parameters used for exhaust control or diagnosing said parameters being related to the vehicle or its components
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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
- 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
- F01N2900/10—Parameters used for exhaust control or diagnosing said parameters being related to the vehicle or its components
- F01N2900/102—Travelling distance
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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
- 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
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1602—Temperature of exhaust gas apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- 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
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- 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
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Exhaust Gas After Treatment (AREA)
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Abstract
本发明涉及一种废气处理系统及废气处理方法,所述方法可包括:如果前/后温差ΔT小于预定温差X,通过将催化剂的温度提高到预定值来对催化剂脱硫,同时喷射还原剂;确定在脱硫之后行驶距离、燃料消耗量或行驶时间是否超过第一参考值;通过检测燃料量来确定是否补充燃料;以及确定是否补充高硫燃料,如果第一参考值没有超过预定值,则补充燃料,并且在喷射还原剂的过程中温差ΔT小于预定温差X。因此,当执行氮氧化合物净化模式以消除氮氧化合物时,根据催化剂前后之间的温差来执行脱硫控制,如果重复执行异常脱硫控制,则确定补充高硫燃料。进一步,该方法使车辆驾驶员有效地确定是否补充高硫燃料并引导车辆驾驶员在其他时间不补充高硫燃料。
Description
相关申请交叉引用
本申请要求于2010年7月8日向韩国知识产权局提交的韩国专利申请No.10-2010-0065899的优先权及利益,为了全部目的,该申请的全部内容以引用方式结合在此。
技术领域
本发明涉及一种废气处理系统(exhaust gas processing system)及其控制方法,该废气处理系统设置有用于消除废气中的氮氧化合物的氮氧化合物净化催化剂。
背景技术
在使用柴油的系统中,废气处理的主要目的是减少颗粒物质以及消除氮氧化合物。
应用柴油机颗粒过滤器(DPF)以减少颗粒物质,并且应用氮氧化合物净化催化剂(LNT)以减少氮氧化合物。
柴油机颗粒过滤器和氮氧化合物净化催化剂被废气中包含的硫(S)污染,因此会有其性能退化的问题,次喷射系统用于通过提高过滤器的温度来对过滤器脱硫。
同时,在补充了高硫燃料的情况中,柴油机颗粒过滤器或氮氧化合物净化催化剂频繁地再生,从而降低其耐久性,或者频繁脱硫会有燃料消耗增加的问题。
在背景技术部分所公开的信息只是为了增强对本发明的一般背景的理解,并不表示或者以任何形式暗示此信息形成本领域技术人员已经公知的现有技术。
发明内容
本发明致力于提供一种废气处理方法,其优点是提高布置在排气管上的待被脱硫的催化剂(例如柴油机颗粒过滤器或氮氧化合物净化催化剂)的耐久性,并且通知补充高硫燃料从而降低燃料消耗。
根据本发明的废气处理方法可以包括:如果前/后温差ΔT小于预定温差X,通过将催化剂的温度提高到预定值来对催化剂脱硫,同时喷射还原剂;确定脱硫之后的行驶距离、燃料消耗量或行驶时间是否超过第一参考值;通过检测燃料量确定是否补充燃料;以及确定是否补充高硫燃料,如果第一参考值没有超过预定值,则补充燃料,并且在喷射还原剂的过程中温差ΔT小于预定温差X(if the first referencevalue does not exceed a predetermined value,the fuel is replenished,andthe temperature difference ΔT is less than the predetermined temperaturedifference X during injection of the reducing agent)。
所述废气处理方法可以进一步包括:不规则地对催化剂脱硫,在确定是否补充高硫燃料之后,如果第一参考值没有超过预定值,则补充燃料,以及温差ΔT小于预定温差X;对不规则脱硫的次数计数,如果计数大于预定值则发出补充高硫燃料的警报。
如上所述,在根据本发明的废气处理方法中,在执行氮氧化合物净化模式以便消除氮氧化合物时,根据催化剂前后之间的温差来执行脱硫控制,如果重复执行异常脱硫控制,则确定补充高硫燃料。
因此,本发明的方法可以使车辆驾驶员有效地确定是否补充高硫燃料,并且引导车辆驾驶员在其他时间不补充高硫燃料。
本发明的方法和设备具有其他的特征和优点,其从所附的附图以及本发明的如下具体实施方式中将变得明显或更详细的给出,附图和说明书一起用于解释本发明的某些原理。
附图说明
图1为根据本发明的示例性废气处理系统的示意图。
图2的曲线图显示在根据本发明的废气处理系统中,示例性的催化剂前/后温差和还原剂喷射量。
图3为显示根据本发明的示例性废气处理方法的流程图。
具体实施方式
现在详细参考本发明的各实施方式,其示例显示在附图中并描述如下。虽然本发明结合示例性实施方式描述,但是应理解本说明书不意指将本发明限制为那些示例性实施方式。而是相反,本发明意指不仅覆盖示例性实施方式,还覆盖各种改变、修改、等价物和其他实施方式,其可以包括在如权利要求所限定的本发明的精神和范围内。
参照图1,废气处理系统包括:发动机100,喷油嘴(injector)150,柴油裂化器120,柴油机颗粒过滤器130,氮氧化合物净化催化剂140,第一氧传感器OS1,第二氧传感器OS2,第四温度传感器TS4,第五温度传感器TS5,第六温度传感器TS6,第七温度传感器TS7,以及控制部110。
柴油裂化器(DFC)120,柴油机颗粒过滤器(DPF)130以及氮氧化合物净化催化剂140顺序布置在排气管上,喷油嘴150布置在柴油裂化器120的上游侧,第一氧传感器OS1布置在喷油嘴150的上游侧。进一步,第二氧传感器OS2布置在氮氧化合物净化催化剂140的下游侧。
第四温度传感器TS4布置在喷油嘴150和柴油裂化器120之间,第五温度传感器TS5布置在柴油裂化器120和柴油机颗粒过滤器130之间。
第六温度传感器TS6布置在柴油机颗粒过滤器130和氮氧化合物净化催化剂140之间,第七温度传感器TS7布置在氮氧化合物净化催化剂140和第二氧传感器OS2之间。
控制部110电连接到检测部并接收检测部检测的信号,检测部包括第一氧传感器OS1、喷油嘴150、第四温度传感器TS4、第五温度传感器TS5、第六温度传感器TS6、第七温度传感器TS7和第二氧传感器OS2。
控制部110确定再生(regenerate)柴油裂化器120、柴油机颗粒过滤器130、或者氮氧化合物净化催化剂140的定时,并且控制喷油嘴150喷射还原剂。
第一氧传感器OS1和第二氧传感器OS2检测废气中的氧浓度,控制部110基于检测到的信号确定废气的状况。
第四温度传感器TS4检测柴油裂化器120的前部废气的温度,第五温度传感器TS5检测柴油裂化器120的后部废气以及柴油机颗粒过滤器130的前部的温度。
第六温度传感器TS6检测柴油机颗粒过滤器130的后部废气以及氮氧化合物净化催化剂140的前部废气的温度,第七温度传感器TS7检测氮氧化合物净化催化剂140的后部废气的温度。
当喷油嘴150喷射还原剂时,控制部110通过温度传感器TS4,TS5,TS6,TS7检测柴油裂化器120的前/后温差,柴油机颗粒过滤器130的前/后温差,以及氮氧化合物净化催化剂140的前/后温差。
控制部110从第一氧传感器OS1和第二氧传感器OS2检测出的氧浓度检测喷射的还原剂的浓度,并控制还原剂的喷射量。
控制部110可以实现为通过预定程序操作的至少一个微处理器,预定程序可以编程为包括一组指令,所述指令执行根据在后详细描述的本发明的各实施方式的方法中的步骤。
参照图2,水平轴表示喷油嘴150喷射的还原剂的量,垂直轴表示前/后温差。催化剂可以是本发明的各实施方式中的柴油裂化器120,柴油机颗粒过滤器130或氮氧化合物净化催化剂140。
根据喷油嘴150喷射的还原剂的量,前/后温差形成规则模型,该数据事先存储在预定存储器中。同时,如果催化剂由于自身的降解没有正常执行,那么减小前/后温差。
减小温差的起因可以分为正常情况和异常情况。正常情况包括行驶距离、燃料消耗量或行驶时间超过了预定值,从而催化剂中积聚了硫的状况,异常情况包括温度传感器TS4,TS5,TS6,TS7或者喷油嘴150运行异常或故障的状况。
特别地,在柴油中包含高浓度的硫的情况下,催化剂迅速被硫污染,催化剂可能不能正常运行,当还原剂被喷射时,前/后温差由于催化剂的退化而减小。
参照图3,在S300中执行氮氧化合物净化模式以通过氮氧化合物净化催化剂140消除氮氧化合物。在氮氧化合物净化模式中燃料随着还原剂由喷油嘴150喷射,喷射的还原剂与待活化的柴油裂化器120反应。
进一步,活化的还原剂与氮氧化合物净化催化剂140反应以消除在氮氧化合物净化催化剂140中捕获的氮氧化合物。
在S312中检测存储在燃料箱中的燃料水平,确定前/后温差ΔT是否大于S310中的预定值X,如果前/后温差ΔT大于预定值X,正常运行氮氧化合物净化模式,如果温差ΔT小于预定值X,则返回到S320。
在S320执行脱硫模式以使喷油嘴150喷射更多的还原剂以提高催化剂的温度。
在S330确定在脱硫模式之后前/后温差ΔT是否超过预定值X,如果前/后温差ΔT大于预定值X,执行S300,如果前/后温差ΔT小于预定值X,执行S340。
在S340确定是否补充燃料。控制部110从燃料表检测燃料量并确定是否补充燃料。
如果不补充燃料,执行S350,确定喷油嘴150的催化剂是否正常运行,并在S360执行故障诊断。用于确定催化剂或喷油嘴150是否正常运行的方法在本发明的各实施方式中被省略。
如果补充燃料,执行S370和S380中的检查催化剂或喷油嘴150的状况。
在S380确定在脱硫之后里程(行驶距离)是否大于预定脱硫距离。可以在本发明的各实施方式的S380中确定在脱硫之后行驶时间是否大于预定脱硫时间。
可以在本发明的各实施方式的S380中确定在脱硫之后燃料消耗量而不是行驶距离(里程)是否大于预定脱硫燃料消耗量。换句话说,可以在S380确定脱硫之后的积累的里程、行驶时间或燃料消耗量是否大于预定值。
在S380中如果脱硫之后的里程、行驶时间或燃料消耗量大于预定值,则执行S320,以及如果脱硫之后的里程、行驶时间或燃料消耗量小于预定值,则执行S390。
在脱硫之后,行驶距离、行驶时间或油耗小于预定值,但是如在S330中所确定的,由于前/后温差ΔT小于预定值X,因此执行S320以异常地对催化剂脱硫,在S390中对异常脱硫的次数计数。
在S390中对异常脱硫的次数计数,如果次数为2,则确定在S400中补充高硫燃料,并通知驾驶员。
如上所述,当执行氮氧化合物净化模式以消除氮氧化合物时,根据催化剂的前/后温差来执行脱硫,在重复执行异常脱硫控制的情况中,确定补充高硫燃料。
本发明的具体示例性实施方式的前述描述是为了说明和描述目的呈现。它们不是穷尽性的或将本发明限制为公开的具体形式,显然根据上述教导可能有很多修改和变体。选择和描述示例性实施方式是为了解释本发明的某些原理及其实际应用,从而使得本领域技术人员能够实现和利用本发明的各示例性实施方式及其各种改变和修改。本发明的范围应由权利要求书及其等价物限定。
Claims (3)
1.一种废气处理方法,包括:
如果催化剂的前/后温差ΔT小于预定数值X,在喷射还原剂的同时,通过将催化剂的温度提高到温度预定值来对催化剂脱硫;
确定刚刚脱硫后催化剂的前/后温差ΔT是否大于预定数值X,如果催化剂的前/后温差ΔT没有超过预定数值X,则确定是否补充燃料;
如果补充燃料,则检测催化剂或喷油嘴的状况,确定其是否正常运行;
如果催化剂或喷油嘴正常运行,确定脱硫之后的行驶距离、燃料消耗量或行驶时间是否超过第一数值;
如果脱硫之后的行驶距离、燃料消耗量或行驶时间没有超过该第一数值,异常地对催化剂进行脱硫;
对异常脱硫的次数进行计数;以及
如果计数结果次数在2次以上,则给出补充高硫燃料的警报。
2.一种废气处理系统,包括:
催化剂,用于消除废气的颗粒物质;
检测部,其检测车辆的驱动状况,以及
控制部,其执行预定程序以根据检测部检测的驱动状况来再生催化剂,
其中预定程序包括用于执行如权利要求1所述的废气处理方法的指令。
3.根据权利要求2所述的废气处理系统,其中所述催化剂为:
消除有害材料的氧化催化剂,或
消除废气中的氮氧化合物的氮氧化合物净化催化剂。
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EP2405108A2 (en) | 2012-01-11 |
CN102309921A (zh) | 2012-01-11 |
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US20120006005A1 (en) | 2012-01-12 |
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