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ca6dl2 scr催化转化器结构可行性研究,ca6dl2 scr催化转化器结构可行性研究19700字47页摘要目前在商用车满足更严格的排放法规的技术路线中，目前国际上普遍采用如下的两种技术路线：一是通过燃烧系统优化降低机内颗粒物的生成，然后采用选择性催化还原（scr）后处理器技术降低nox的排放；二是通过废弃再循环（egr）降低机内nox生成量，然后采用颗粒物后...
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CA6DL2 SCR催化转化器结构可行性研究
19700字 47页
摘要
目前在商用车满足更严格的排放法规的技术路线中，目前国际上普遍采用如下的两种技术路线：一是通过燃烧系统优化降低机内颗粒物的生成，然后采用选择性催化还原（SCR）后处理器技术降低NOx的排放；二是通过废弃再循环（EGR）降低机内NOx生成量，然后采用颗粒物后处理技术降低颗粒物排放。
由于我国排放法规体系等效采用欧洲法规体系，考虑到我国的国情和技术的移植便利性，我国各主要整车厂和柴油机企业也倾向于采用SCR技术作为满足未来更严格排放要求的主要技术措施。目前，虽然国内几家主要车用柴油机企业已经在柴油机领域开展了SCR技术的研究，但基本上以国外技术引进应用为主，核心技术仍主要掌握在国外相关厂家手中，这成为我国该技术推广和应用的主要瓶颈，而我国随着道路运输的快速增长，车用柴油机需求量也正在迅速增加，其污染物的治理刻不容缓，急需成本低廉、性能高效的SCR排气后处理技术和装置。因此，有关SCR技术的国产化研究日益紧迫，对于SCR技术从催化剂性能研究、催化转化器优化设计到尿素喷射系统的控制策略的研究与应用、OBD系统的开发和标定，再到整个系统在整车上的集成和匹配应用的研究非常必要。
本文简单介绍CA6DL2（8.6L）SCR催化转化器的结构，详细地对相关的试验验证SCR催化转化器结构的合理性做了说明。研究结果对满足国Ⅳ排放的商用柴油机具有一定的参考价值，对我国降低商用柴油机排放、减少大气污染具有现实的社会意义。
关键词：车用柴油机；选择性催化还原；试验验证
ABSTRACT
In all the technology routes studied by diesel engine manufacturers to deal with more stringent emission regulations two methods are concluded ,which one is reducing NOx emissions with SCR(Selective Catalytic Reduction)technology on the basis of combustion optimization for diesel engines to reduce PM ,and the other to debase NOx emissions with EGR(Exhaust Gas Recirculation)and PM with DPF.
Due to our emission standard system is equivalent to the Europe standard system, in view of China’s conditions and the convenience of technology explanting, manufacturers of vehicle and diesel engine are inclined to adopting the SCR technology as the major technology to meet the more stringent exhaust emission standards in future .However, the study about Urea-SCR technology is not self-dependent currently in our country although the native manufacturers have been starting the application in SCR technology on heavy-duty diesel engines .Due to the key technology and patents for SCR system which are held by manufacturers abroad ,they have been becoming the bottle-neck of the SCR technology extending and application in China .With the diesel vehicles are increasing significantly in our country ,it is very urgent to reduce the pollutants from vehicles , and it has a rapidly increasing demand of the advanced SCR catalysts .Therefore ,it is urgent for the domestic research of the relative SCR technology and is necessary to have a totally understand of them to prepare for the further study and domestically manufacture . So, it is more and more necessary to research the SCR technology, from the catalyst, the catalyst box design , the urea dosing control strategy and the OBD system, to the entire system in the vehicle integrating and matching.
The paper simply introduces the structure of CA6DL2（8.6L）the SCR catalytic converter , but the detail of relevant test the rationality of the structure of SCR catalytic converter .The results of the study on four commercial diesel engine emissions to meet countries have a certain reference value ,to our country commercial diesel engine emissions reduction ,to reduce atmospheric pollution has realistic social significance.
Key words: heavy-duty diesel engines; selective catalytic reduction; test
目录
第一章 绪论 5
1.1 研究背景 5
1.2 降低柴油机排气污染物的技术途径 7
1.3 当前柴油机排气污染物控制的主要技术路线 9
1.4 SCR技术的发展和研究现状 11
1.4.1 SCR技术的介绍 11
1.4.2 SCR技术国外研究及应用现状 12
1.4.3 SCR技术国内研究及应用现状 12
1.5 课题的提出和内容 13
1.6 本章小结 14
第二章 SCR催化转化器结构设计概述 15
2.1 SCR催化转化器的优化设计计算思路 15
2.2 SCR催化转化器结构设计及优化方案 16
2.3 CA6DL2 SCR催化转化器的结构介绍 17
2.3.1 SCR催化转化器箱式结构 17
2.3.2 SCR 催化转化器筒式结构 18
2.4 衬垫的介绍和特性 18
2.4.1 衬垫的介绍 18
2.4.2 衬垫的特性 20
2.5 本章小结 21
第三章 CA6DL2 SCR催化转化器结构合理性试验验证 22
3.1 背压试验 22
3.1.1 柴油机排气背压对性能的影响 22
3.1.2 试验目的 23
3.1.3研究对象 23
3.1.4 试验装置 23
3.1.5 CFD计算分析及试验数据对比分析 24
3.1.6 结论 30
3.2轴向推力试验 31
3.2.1试验的目的 31
3.2.2试验装置 31
3.2.3试验规范 32
3.2.4研究对象 32
3.2.5设计目标 33
3.2.6试验结果与分析 33
3.2.7试验结论 35
3.3振动试验 35
3.3.1试验目的 35
3.3.2试验装置 36
3.3.3试验规范 36
3.3.4研究对象 38
3.3.5设计目标 39
3.3.6振动试验工装夹具 40
3.3.7试验结果与分析 41
3.3.8试验结论 42
3.4本章小结 43
第四章 全文总结和工作展望 44
4.1全文总结 44
4.2工作展望 45
参考文献 46
致谢 47
19700字 47页
摘要
目前在商用车满足更严格的排放法规的技术路线中，目前国际上普遍采用如下的两种技术路线：一是通过燃烧系统优化降低机内颗粒物的生成，然后采用选择性催化还原（SCR）后处理器技术降低NOx的排放；二是通过废弃再循环（EGR）降低机内NOx生成量，然后采用颗粒物后处理技术降低颗粒物排放。
由于我国排放法规体系等效采用欧洲法规体系，考虑到我国的国情和技术的移植便利性，我国各主要整车厂和柴油机企业也倾向于采用SCR技术作为满足未来更严格排放要求的主要技术措施。目前，虽然国内几家主要车用柴油机企业已经在柴油机领域开展了SCR技术的研究，但基本上以国外技术引进应用为主，核心技术仍主要掌握在国外相关厂家手中，这成为我国该技术推广和应用的主要瓶颈，而我国随着道路运输的快速增长，车用柴油机需求量也正在迅速增加，其污染物的治理刻不容缓，急需成本低廉、性能高效的SCR排气后处理技术和装置。因此，有关SCR技术的国产化研究日益紧迫，对于SCR技术从催化剂性能研究、催化转化器优化设计到尿素喷射系统的控制策略的研究与应用、OBD系统的开发和标定，再到整个系统在整车上的集成和匹配应用的研究非常必要。
本文简单介绍CA6DL2（8.6L）SCR催化转化器的结构，详细地对相关的试验验证SCR催化转化器结构的合理性做了说明。研究结果对满足国Ⅳ排放的商用柴油机具有一定的参考价值，对我国降低商用柴油机排放、减少大气污染具有现实的社会意义。
关键词：车用柴油机；选择性催化还原；试验验证
ABSTRACT
In all the technology routes studied by diesel engine manufacturers to deal with more stringent emission regulations two methods are concluded ,which one is reducing NOx emissions with SCR(Selective Catalytic Reduction)technology on the basis of combustion optimization for diesel engines to reduce PM ,and the other to debase NOx emissions with EGR(Exhaust Gas Recirculation)and PM with DPF.
Due to our emission standard system is equivalent to the Europe standard system, in view of China’s conditions and the convenience of technology explanting, manufacturers of vehicle and diesel engine are inclined to adopting the SCR technology as the major technology to meet the more stringent exhaust emission standards in future .However, the study about Urea-SCR technology is not self-dependent currently in our country although the native manufacturers have been starting the application in SCR technology on heavy-duty diesel engines .Due to the key technology and patents for SCR system which are held by manufacturers abroad ,they have been becoming the bottle-neck of the SCR technology extending and application in China .With the diesel vehicles are increasing significantly in our country ,it is very urgent to reduce the pollutants from vehicles , and it has a rapidly increasing demand of the advanced SCR catalysts .Therefore ,it is urgent for the domestic research of the relative SCR technology and is necessary to have a totally understand of them to prepare for the further study and domestically manufacture . So, it is more and more necessary to research the SCR technology, from the catalyst, the catalyst box design , the urea dosing control strategy and the OBD system, to the entire system in the vehicle integrating and matching.
The paper simply introduces the structure of CA6DL2（8.6L）the SCR catalytic converter , but the detail of relevant test the rationality of the structure of SCR catalytic converter .The results of the study on four commercial diesel engine emissions to meet countries have a certain reference value ,to our country commercial diesel engine emissions reduction ,to reduce atmospheric pollution has realistic social significance.
Key words: heavy-duty diesel engines; selective catalytic reduction; test
目录
第一章 绪论 5
1.1 研究背景 5
1.2 降低柴油机排气污染物的技术途径 7
1.3 当前柴油机排气污染物控制的主要技术路线 9
1.4 SCR技术的发展和研究现状 11
1.4.1 SCR技术的介绍 11
1.4.2 SCR技术国外研究及应用现状 12
1.4.3 SCR技术国内研究及应用现状 12
1.5 课题的提出和内容 13
1.6 本章小结 14
第二章 SCR催化转化器结构设计概述 15
2.1 SCR催化转化器的优化设计计算思路 15
2.2 SCR催化转化器结构设计及优化方案 16
2.3 CA6DL2 SCR催化转化器的结构介绍 17
2.3.1 SCR催化转化器箱式结构 17
2.3.2 SCR 催化转化器筒式结构 18
2.4 衬垫的介绍和特性 18
2.4.1 衬垫的介绍 18
2.4.2 衬垫的特性 20
2.5 本章小结 21
第三章 CA6DL2 SCR催化转化器结构合理性试验验证 22
3.1 背压试验 22
3.1.1 柴油机排气背压对性能的影响 22
3.1.2 试验目的 23
3.1.3研究对象 23
3.1.4 试验装置 23
3.1.5 CFD计算分析及试验数据对比分析 24
3.1.6 结论 30
3.2轴向推力试验 31
3.2.1试验的目的 31
3.2.2试验装置 31
3.2.3试验规范 32
3.2.4研究对象 32
3.2.5设计目标 33
3.2.6试验结果与分析 33
3.2.7试验结论 35
3.3振动试验 35
3.3.1试验目的 35
3.3.2试验装置 36
3.3.3试验规范 36
3.3.4研究对象 38
3.3.5设计目标 39
3.3.6振动试验工装夹具 40
3.3.7试验结果与分析 41
3.3.8试验结论 42
3.4本章小结 43
第四章 全文总结和工作展望 44
4.1全文总结 44
4.2工作展望 45
参考文献 46
致谢 47
