Research On Solid Oxide Fuel Cell Based On Methanol Reforming

Solid oxide fuel cell(SOFC)is a kind of fuel cell with the highest comprehensive thermal efficiency and power generation efficiency.Its high reaction temperature can be used to make full use of fuel.Moreover,the fuel selection range of solid oxide fuel cell is wide.The solid oxide YSZ was used as the electrolyte,which was not limited by the weak carbon resistance of noble metal catalysts..Methanol steam reforming is a mature hydrogen production process,but rarely used in SOFC stack power generation system.In view of the above research direction,the system research after the coupling of reforming hydrogen production unit and reactor unit is particularly important.It is very important to understand the operating state,electrical output,attenuation mechanism and rate of SOFC under reforming condition.The main research results and contents of this paper are as follows :(1)In this paper,the basic performance of SOFC stack was characterized,and the relationship between the open circuit voltage and the change of hydrogen concentration in the reduction process was analyzed.The basic performance parameters of 36 SOFC stacks were characterized,and the rated power was 1000 W.The 36 stack modules were monitored and analyzed,and the effects of different experimental parameters on the stack performance were tested.The influence of temperature on the performance of the three small reactors was carried out,and the relationship between temperature and current density was also analyzed.The dynamic losses of the stack at different current densities are analyzed.The thermal cycle and long-term experiments under high current density conditions were carried out on the later three small reactors,and the attenuation rate after thermal cycle of the reactor foundation was analyzed and calculated.(2)The effects of temperature,water-alcohol ratio and pressure on the hydrogen production by steam reforming of methanol were analyzed and simulated.At the same time,the multi-physical field simulation of the reformer,the key component of the system,was carried out,and the next experiment was improved.Experiments show that the water-alcohol ratio is an important factor affecting the reforming effect,and the optimal water-alcohol ratio is selected.The hydrogen production effect under different reaction pressure was studied,and the multi-physical field simulation distribution of the reformer was simulated and analyzed.(3)The hydrogen production unit of reforming was coupled with the SOFC cell unit in series,and the high-temperature tail gas was used for heat transfer utilization of reforming to realize the cascade utilization of energy.Set reforming conditions,so that the system can be stable operation,stable reactor power output.Under the same water-alcohol ratio,the effect of different reforming temperatures on the performance of methanol reforming SOFC system and its influencing principle were studied.According to the change trend of the output unit of the system electrical performance before and after the thermal cycle of the system,the analysis and summary are carried out,and the attenuation rate is estimated.In the later stage,the result feedback analysis of the stack module is carried out by disassembly.Based on the existing solid oxide fuel cells,a 1000 W methanol reforming SOFC system was designed and tested.Combining the methanol reforming hydrogen production system with SOFC power generation,the interaction mechanism between the hydrogen production system and the SOFC stack after coupling studied through experiments,which provides data basis and practical guidance for subsequent theoretical analysis and experimental research..