柴油动力机械设备尾气分析与净化专用课件.ppt

Global Leader in Emissions Control Solutions Combustion by-products（大量有毒气体和可吸入柴油微粒） NOx (oxides of nitrogen) CO (carbon monoxide) HC (hydrocarbons) THC (total hydrocarbons) NMHC (non-methane hydrocarbons) NMNEHC (non-methane, non-ethane hydrocarbons) VOCs (volatile organic compounds) CH2O (formaldehyde) SOx (oxides of sulfur) PM (diesel particulate matter) PM10 (under 10 microns) PM2.5 (under 2.5 microns) 柴油机尾气的产生 Air Fuel CxHy H2O + CO2 + N2 + excess O2 Q. 什么是催化剂 ? A. 催化剂是一种能促进和加速化学反应而本身在反应前后没有任何消耗的物质。 催化剂基本知识 催化剂作用效果对比图催化剂大大降低转化温度 催化剂载体和载体表面 CATALYST - A material that facilitates a chemical reaction but is not consumed in the process 载体蜂巢设计加表面涂层 A medium to which a catalyst may be applied The surface of a substrate/honeycomb is usually coated with a precious metal (such as Rd, Pt, Pd镭、钯、铂合金) This coating is used to promote chemical reactions at temperatures present in the exhaust The two most common materials which a catalyst may be applied to are either ceramic or metallic DCL International Inc. 上海杰凯环保科技有限公司 柴油动力机械尾气净化产品介绍 加拿大DCL国际中国总代理 始终致力于保护和改善我们呼吸环境 DCL Mission Statement 系列产品 Catalyst Elements（DOC） Packaged Catalyst and Muffler Systems Wall-Flow Particulate Filters（DPF） Flow-Through Filters（FTF） 催化转换器载体结构图 放大后珊瑚状涂层表面，增加载体表面积 合金催化剂颗粒 Substrate channel walls 直流低背压气流通道 CO O2 Substrate (ceramic or metallic) Platinum（铂合金颗粒） 氧化铝涂层 ? Al2O3 (increases surface area) CO2 废气在通道内净化原理 蜂巢单元采用薄壁金属，真空镀铜加牢固钎焊结构，8000H免维护保证 Nickel brazed FeCrAl foil Easily optimized for each application Zero risk of damage during transport or installation Lowest packaging cost Highest mechanical shock resistance 金属载体与陶瓷载体相比的优点 陶瓷载体 Less expensive to manufacture and Take longer to heat up and begin functioning compared to metallic substrates Units do not bend or flex under heavy vibration; instead it breaks or cracks 专利保护金属载体 ? Offers better durability than ceramic Generally will create a minimal backpressure and will have the longest operating life Some designs use spiral winding of