Experimental And Numerical Simulation Of Marine Methane Reformer

With the increasing requirement of environmental protection,the development of new energy ships is particularly important because of the large energy consumption for waterway transport.Fuel cell shows a potential application,due to its high efficiency,low emission,low noise,flexible arrangement and so on,in replacement of traditional power plant in submarine,liquefied natural gas ship and scientific research ship and the like.As the feed gas for fuel cell,hydrogen has the disadvantage in bulk storage.It is necessary to solve the fuel storage problem to commercialize fuel cell ship.As a usual cargo in commercial ship,natural gas is abundant and easy to store.For this reason,it is a practical way to produce hydrogen in situ via methane steam reforming.However,the equipment used in industry for methane steam reforming is too large to be suitable for direct marine applications although easy to control and has a high hydrogen production efficiency.Therefore,the design of marine compact reformer becomes a key problem to be solved urgently in the shipping industry.The micro-channel bidirectional coupling compact methane-reformer can meet the equipment requirements of the offshore environment,so it eould provide a feasible ehoice for marine use.The present research on methane steam reforming mainly focuses on the preparation and optimization of catalysts to improve the methane conversion rate,carbon monoxide selectivity,carbon deposition resistance and other important properties.Based on these studies,the work of this paper mainly includes:(1)The experimental platform of methane steam reforming reaction was designed and constructed.(2)Ni/CeO2,Mg-Ni/CeO2 and Sr-Ni/CeO2 catalyst were prepared by the equal volume impregnation method and the distributed impregnation method.The catalyst performance was characterized and analyzed(3)The methane steam reforming experiment was carried out.The catalytic activity of the prepared catalyst was investigated.The characterization results and the carbon deposition resistance of the catalyst were obtained.The optimum activity components and additives were obtained under certain working conditions.The loading amount,at this time,the methane conversion rate was 74.9%,the hydrogen production rate was 182.3%,and the CO selectivity was 20.6%.(4)The conditions of working conditions were changed.The effects of reaction temperature,volumetric space velocity and water-carbon ratio on methane steam reforming reaction were investigated,and the optimal working conditions were obtained.The reaction temperature was 700?.The water-carbon ratio is 3:1 and the airspeed is 1000h-1.(5)COMSOL was used to establish a 3d coupling model for the methane reformer.The influence of reaction conditions on the change of components in the microchannel and the performance of the reformer was analyzed.