CN112780394A - 非道路国四柴油发动机尾气后处理总成装置 - Google Patents
非道路国四柴油发动机尾气后处理总成装置 Download PDFInfo
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Abstract
本发明公开了一种非道路国四柴油发动机尾气后处理总成装置,包括:DOC总成、DPF总成、SCR总成、第一温度传感器、第二温度传感器、第三温度传感器以及尿素喷射模块。DOC总成的一端用以与发动机排气管连通。DPF总成的一端与DOC总成的另一端固定连通。SCR总成的一端与DPF总成的另一端固定连通。第一温度传感器设置于DOC总成的一端上。第二温度传感器设置于DOC总成的另一端上。第三温度传感器设置于SCR总成的一端上。尿素喷射模块设置于SCR总成上。发动机排气管中的尾气依次通过DOC总成、DPF总成及SCR总成。本发明的非道路国四柴油发动机尾气后处理总成装置,结构简单合理,降低了标定模型的复杂程度和标定工作量,且处理后的尾气满足国四排放标准。
Description
技术领域
本发明是关于柴油发动机技术领域,特别是关于一种非道路国四柴油发动机尾气后处理总成装置。
背景技术
柴油机DOC-DPF-SCR总成即氧化催化器、柴油颗粒捕集器及选择性催化还原系统的集合,用于对柴油机的尾气进行处理。
但现有的总成装置测点数据较多,虽然提高了模型计算的精度,但导致标定模型复杂,标定工作量大,且现有的总成装置结构强度较低,而装配部位的精度要求较高。
公开于该背景技术部分的信息仅仅旨在增加对本发明的总体背景的理解,而不应当被视为承认或以任何形式暗示该信息构成已为本领域一般技术人员所公知的现有技术。
发明内容
本发明的目的在于提供一种非道路国四柴油发动机尾气后处理总成装置,其结构简单合理,降低了标定模型的复杂程度和标定工作量,且处理后的尾气满足国四排放标准。
为实现上述目的,本发明提供了一种非道路国四柴油发动机尾气后处理总成装置,包括:DOC总成(氧化催化器)、DPF总成(柴油颗粒捕集器)、SCR总成(选择性催化还原系统)、第一温度传感器、第二温度传感器、第三温度传感器以及尿素喷射模块。DOC总成的一端用以与发动机排气管连通。DPF总成的一端与DOC总成的另一端固定连通。SCR总成的一端与DPF总成的另一端固定连通。第一温度传感器设置于DOC总成的一端上。第二温度传感器设置于DOC总成的另一端上。第三温度传感器设置于SCR总成的一端上。尿素喷射模块设置于SCR总成上。发动机排气管中的尾气依次通过DOC总成、DPF总成及SCR总成。
在本发明的一实施方式中,非道路国四柴油发动机尾气后处理总成装置还包括氮氧传感器,设置于SCR总成的另一端上。
在本发明的一实施方式中,第一温度传感器和第二温度传感器分别用以检测DOC总成两端的温度。
在本发明的一实施方式中,第三温度传感器用以检测SCR总成的一端的温度。
在本发明的一实施方式中,非道路国四柴油发动机尾气后处理总成装置还包括压差传感器,设置于DPF总成上,且压差传感器用以检测DPF总成两端的压差。
在本发明的一实施方式中,尿素喷射模块包括喷嘴及尿素混合器。
在本发明的一实施方式中,DOC总成、DPF总成及SCR总成呈一字型结构。
与现有技术相比,根据本发明的非道路国四柴油发动机尾气后处理总成装置,结构简单合理,降低了标定模型的复杂程度和标定工作量,且处理后的尾气满足国四排放标准。
附图说明
图1是根据本发明一实施方式的非道路国四柴油发动机尾气后处理总成装置的主视结构示意图;
图2是根据本发明另一实施方式的非道路国四柴油发动机尾气后处理总成装置的主视结构示意图。
主要附图标记说明:
1-DOC总成,2-DPF总成,3-SCR总成,4-第一温度传感器,5-第二温度传感器,6-第三温度传感器,7-尿素喷射模块,71-喷嘴,72-尿素混合器,8-氮氧传感器,9-压差传感器,10-发动机排气管。
具体实施方式
下面结合附图,对本发明的具体实施方式进行详细描述,但应当理解本发明的保护范围并不受具体实施方式的限制。
除非另有其它明确表示,否则在整个说明书和权利要求书中,术语“包括”或其变换如“包含”或“包括有”等等将被理解为包括所陈述的元件或组成部分,而并未排除其它元件或其它组成部分。
图1是根据本发明一实施方式的非道路国四柴油发动机尾气后处理总成装置的主视结构示意图。如图1所示,根据本发明优选实施方式的一种非道路国四柴油发动机尾气后处理总成装置,包括:DOC总成1、DPF总成2、SCR总成3、第一温度传感器4、第二温度传感器5、第三温度传感器6以及尿素喷射模块7。DOC总成1的一端用以与发动机排气管连通。DPF总成2的一端与DOC总成1的另一端固定连通。SCR总成3的一端与DPF总成2的另一端固定连通。第一温度传感器4设置于DOC总成1的一端上。第二温度传感器5设置于DOC总成1的另一端上。第三温度传感器6设置于SCR总成3的一端上。尿素喷射模块7设置于SCR总成3上。发动机排气管中的尾气依次通过DOC总成1、DPF总成2及SCR总成3。
在本发明的一实施方式中,非道路国四柴油发动机尾气后处理总成装置还包括氮氧传感器8,设置于SCR总成3的另一端上。第一温度传感器4和第二温度传感器5分别用以检测DOC总成1两端的温度。
在本发明的一实施方式中,第三温度传感器6用以检测SCR总成3的一端的温度。非道路国四柴油发动机尾气后处理总成装置还包括压差传感器9,设置于DPF总成2上,且压差传感器9用以检测DPF总成2两端的压差。
在本发明的一实施方式中,尿素喷射模块7包括喷嘴71及尿素混合器72。DOC总成1、DPF总成2及SCR总成3呈一字型结构。
图2是根据本发明一实施方式的非道路国四柴油发动机尾气后处理总成装置的主视结构示意图。如图2所示,DOC总成1、DPF总成2及SCR总成3呈U字型结构(U字型结构相较于图1中的一字型结构具有更好的通用性),其中进气管、DOC总成1、DPF总成2和喷嘴71在U字的一边,而SCR总成3和出气管在U字的另一边,且尿素混合器72作为U字型两边的结构连接结构,整体用支架和卡箍固定。本实施例也具有如图1所示的多个传感器,因为连接关系位置相同,所以在此不再赘述。
在实际应用中,本发明的非道路国四柴油发动机尾气后处理总成装置,在综合评估了非道路国四排放的限值要求、颗粒捕集器的过滤能力、系统标定复杂程度后,技术方案为DOC+DPF+SCR(不含ASC)。如图1所示,产品结构为低背压一字型结构,按气流顺序其结构为进气管、DOC总成1、DPF总成2、喷嘴71、尿素混合器72、SCR总成3及出气管。DOC+DPF的模块方案,保证颗粒的过滤效率不低于99%,DPF总成2中收集的颗粒以持续被动再生的方式进行反应;喷入混合器中的尿素在高温尾气中进一步混合分解成氨气(NH3),在SCR催化剂的作用下,尾气中的氮氧化合物与氨气发生反应,最终生成氮气(N2)。传感器布置方案:温度传感器×3+氮氧传感器8×1+压差传感器9×1,DOC前温度传感器(第一温度传感器4)、DOC后温度传感器(第二温度传感器5)、SCR前温度传感器(第三温度传感器6),SCR后氮氧传感器8(氮氧传感器8),DPF压差传感器9(压差传感器9)。同时,为了提高技术方案的通用性,开发了紧凑结构的U型方案,如图2所示,按气流顺序其结构同一字型结构。其中,进气管+DOC+DPF+喷嘴71在U字的一边,SCR+出气管在U字另一边,尿素混合器72作为U字两边的连接结构,整体用支架、卡箍固定。
总之,本发明的非道路国四柴油发动机尾气后处理总成装置,结构简单合理,降低了标定模型的复杂程度和标定工作量,且处理后的尾气满足国四排放标准。
前述对本发明的具体示例性实施方案的描述是为了说明和例证的目的。这些描述并非想将本发明限定为所公开的精确形式,并且很显然,根据上述教导,可以进行很多改变和变化。对示例性实施例进行选择和描述的目的在于解释本发明的特定原理及其实际应用,从而使得本领域的技术人员能够实现并利用本发明的各种不同的示例性实施方案以及各种不同的选择和改变。本发明的范围意在由权利要求书及其等同形式所限定。
Claims (7)
1.一种非道路国四柴油发动机尾气后处理总成装置,其特征在于,包括:
DOC总成,所述DOC总成的一端用以与发动机排气管连通;
DPF总成,一端与所述DOC总成的另一端固定连通;
SCR总成,一端与所述DPF总成的另一端固定连通;
第一温度传感器,设置于所述DOC总成的所述一端上;
第二温度传感器,设置于所述DOC总成的所述另一端上;
第三温度传感器,设置于所述SCR总成的所述一端上;以及
尿素喷射模块,设置于所述SCR总成上;
其中,所述发动机排气管中的尾气依次通过所述DOC总成、所述DPF总成及所述SCR总成。
2.如权利要求1所述的非道路国四柴油发动机尾气后处理总成装置,其特征在于,还包括氮氧传感器,设置于所述SCR总成的另一端上。
3.如权利要求1所述的非道路国四柴油发动机尾气后处理总成装置,其特征在于,所述第一温度传感器和所述第二温度传感器分别用以检测所述DOC总成两端的温度。
4.如权利要求1所述的非道路国四柴油发动机尾气后处理总成装置,其特征在于,所述第三温度传感器用以检测所述SCR总成的所述一端的温度。
5.如权利要求1所述的非道路国四柴油发动机尾气后处理总成装置,其特征在于,还包括压差传感器,设置于所述DPF总成上,且所述压差传感器用以检测所述DPF总成两端的压差。
6.如权利要求1所述的非道路国四柴油发动机尾气后处理总成装置,其特征在于,所述尿素喷射模块包括喷嘴及尿素混合器。
7.如权利要求1所述的非道路国四柴油发动机尾气后处理总成装置,其特征在于,所述DOC总成、所述DPF总成及所述SCR总成呈一字型结构。
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