【作者】 李全；

【导师】 肖友洪； 周伟中；

【作者基本信息】 哈尔滨工程大学 ， 工程硕士（专业学位）， 2021， 硕士

【摘要】 随着近些年来船舶保有量的增加以及船舶发动机功率的增大,船舶排放污染物造成的环境污染越加严重。鉴于此,世界各国及组织制定了更加严格的船舶柴油机污染物排放控制法规,对各污染物的排放进行了限制。船舶发动机舱的空间条件成为制约多种类排气后处理技术协同作用的主要限制因素,针对多污染物的一体化排放控制技术是急需解决的问题,本文主要研究内容如下。利用AVL fire与AVL boost软件对DOC+CDPF反应器简化模型进行三维及一维仿真计算。通过三维仿真计算对反应器内的流场及催化剂前颗粒物分布状态进行研究,通过一维仿真计算对DOC的催化氧化反应及CDPF载体的压力损失和连续再生反应进行研究,并与实验结果进行对比验证。利用AVL fire与AVL boost软件进行SCR后处理系统的三维及一维仿真计算。通过三维仿真计算的方式对反应器内部流场、催化剂前还原剂的分布状态进行分析,通过一维仿真计算对SCR催化剂的选择性催化还原反应进行研究,并与实验结果进行对比验证。通过分析实验可行性确定DOC+CDPF+SCR为本文所采用的柴油机排放后处理技术路线,将前文所用反应器串联后进行了台架实验。简化结构后进行一维仿真计算,研究其中SCR催化剂上选择性催化还原反应与前文的区别,并以实验结果进行对比验证;其次通过三维与一维仿真计算的方式对SCRF催化剂进行了研究,分析了反应器内部流场及还原剂、颗粒物分布情况和选择性催化还原反应的进行情况,并对其优劣性进行分析,并与实验结果进行对比验证。最后将DOC、CDPF、SCR进行集成一体化设计,对其结构进行优化,通过三维仿真计算的方式对其内部流场、SCR催化剂前还原剂及DPF催化剂载体前颗粒物分布情况进行分析。更多还原

【Abstract】 With the increase of ship’s in possession and engine power in recent years,the environmental pollution caused by ship emission pollutants is more and more serious.Given this,Countries and organizations around the world have formulated much more stringenter regulations on pollutant emission control of marine diesel engines,which limitted the emission of various pollutants.The space condition of marine engine room is the main limiting factor restricting the synergy of multiple exhaust aftertreatment technology,therefore,the integrated emission control technology for multiple pollutants is an urgent problem to be solved.The main contents of this thesis were as follows:The simplified model of DOC+CDPF reactor was perform 3D and 1D simulating calculation through AVL fire and AVL boost software.Through three-dimensional simulating calculation,the flow field in the reactor and the particle distribution state before the catalyst were studied.The catalytic oxidation reaction of DOC,the pressure loss of the CDPF carrier and its continuous regeneration reaction were studied by the one-dimensional simulating calculation.And both of which were Compared and verified with the experimental results.The SCR aftertreatment system was perform 3D and 1D simulating calculation through AVL fire and AVL boost software.The flow field inside the reactor and the distribution of the reducing agent before the catalyst were analyzed through three-dimensional simulating calculation,and the selective catalytic reduction reaction of the SCR catalyst was studied through one-dimensional simulation calculation.both of which were Compared and verified with the experimental results.By analyzing the feasibility of experiment,adopt DOC+CDPF+SCR as the technical route of diesel engine emission aftertreatment,A bench experiment was performed connecting the reactors used previously in series.One-dimensional simulating calculation was carried out to study the differences between the selective catalytic reduction reaction on the SCR catalyst and the above,then Compared and verified with the experimental results.Secondly,the SCRF catalyst was studied by three-dimensional and one-dimensional simulating calculation,the flow field,reducing agent distribution,particle distribution and selective catalytic reduction reaction state were analyzed.Its advantages and disadvantages were analyzed and compared with the experimental results.Final,the integrated design of the DOC、CDPF、SCR was carried out,and optimized the structure furtherly.The internal flow field,reducing agent before SCR catalyst and particle distribution before DPF catalyst carrier were analyzed by three-dimensional simulation.更多还原