Research On Key Technology Of Ship Exhaust Catalytic Purification For Inland Water Ships

In order to save costs,the inland river ships which are mainly operated by individuals usually use inferior fuel oil,resulting in serious pollution of inland river shipping lines.At present,there are three ways to solve the problem of pollution from inland ships,including organic pre purification,internal purification and after machine purification.However,using the improvement of fuel quality and simple internal purification,the exhaust emission of ships can not be solved thoroughly.After the treatment of the tail gas,the most effective way to solve the pollution of the ship's tail gas is to be carried out.At present,the main post-processing technologies include exhaust gas recirculation technology?EGR?,nitrogen oxide storage reduction?NSR?and selective catalytic reduction?SCR?.The most promising technology is selective catalytic reduction?SCR?,and CO as a reducing agent and selective catalytic oxidation of NOx has attracted much attention.In order to achieve the purpose of simultaneous removal of CO and NO,it is suitable for the catalytic purification of inland ships,and it is very important to catalyze the catalyst with good activity and low cost.Therefore,the relevant research work has been carried out in this paper.In this paper,the related work and conclusions are as follows:?1?research on the discharge characteristics of inland river ships.The relationship between the emissions of main pollutants and load of exhaust gas is analyzed by simulating the different loads of inland river ships by changing the load of diesel engine.The emission of particles in low speed diesel engine increases with the increase of load.The emission of high speed diesel particulate matter increases and then decreases with the increase of load,and the emission of high speed diesel engine is obviously higher than that of low speed diesel engine.The amount of NOx emission increases with the increase of load,and the rate of change is greater.At the same time,with the increase of engine speed,the emission of NOx increases first and then decreases.The emission of hydrocarbons increases with the increase of load.HC emissions first decrease and then increase,and the HC emissions of low speed diesel engines are higher than those of high speed diesel engines.With the increase of load,the CO emissions first decrease and then increase.The load tends to be stable between 50%-75%.When the load changes at 75%,the CO emissions fluctuate greatly.?2?preparation of Pt/Ni-gamma Al₂O₃ bimetallic catalyst and determination of its catalytic activity.The accuracy of MIL-53?Al?and?-Al₂O₃ was confirmed by X ray diffraction?XRD?and Fu Liye transform infrared spectroscopy?FT-IR?.Through BET characterization,the catalyst has high specific surface area and catalyst pore has certain scalability.Pt/Ni bimetallic supported?-Al₂O₃ catalyst has good catalytic activity for the catalytic oxidation of CO.The Pt/Ni-?-Al₂O₃ catalyst for Pt/Ni=1:2,1:1,2:1 is completely converted at the temperature of 190,190,and 150.Pt/Ni bimetallic supported?-Al₂O₃ catalyst has good catalytic activity for CO reduction of NO.The Pt/Ni-?-Al₂O₃ catalyst for Pt/Ni=1:2,1:1,2:1 is completely converted at 450?,400?,and 350?,and the conversion rate is above 90%at 350?.?3?the preparation and catalytic activity of CuO,ZnO and Cu-Zn-O metal oxides and their composite oxides.Pure oxides of CuO and ZnO contain CuO and ZnO phases.The five kinds of catalysts are all "layered",pure CuO is made up of regular rhomboid "lamellar",pure ZnO is a "terraced" structure accumulated by irregular "lamellar".With the increase of CuO content,the morphology of "lamellar" is closer to diamond or square.The higher the ZnO content is,the higher the specific surface area of the oxide is.ZnO,CuO,CuO-ZnO-1/4,CuO-ZnO-1/1 and CuO-ZnO-4/1 oxide catalyzed the conversion of CO at 350?,175?,250?,200?,175?,respectively.ZnO,CuO-ZnO-1/4,CuO-ZnO-1/1oxides catalyze the conversion of NO over 90%at 350?,400?,and 400?,respectively,and CuO and CuO-ZnO-4/1 have no catalytic activity.