Construction And Optimization Of The Coupling System Of Hydrogen Storage In Liquid Form By Catalysis And Hydrogen Fuel Cell

As a secondary energy source,hydrogen has many advantages such as clean,high efficiency and renewable.However,high-pressure hydrogen storage has disadvantages such as low volume energy storage density,expensive,and difficulty in transportation.Therefore,the study of hydrogen storage carriers is of great research significance in effective utilization of hydrogen energy.This paper focuses on the hydrogen dehydrogenation process of the storage liquid and the power generation process of the fuel cell,and aims the design and development of coupling system for hydrogen storage liquid catalytic dehydrogenation and hydrogen fuel cell.A miniature hydrogen storage liquid catalytic hydrogen supply system and a k W-level fuel cell system were set up.The research content of this paper are as follows:Firstly,cyclohexane-benzene was selected as the hydrogen storage and release system of liquid organic hydrogen carriers.The system was designed and built for the small-scale hydrogen storage liquid catalytic dehydrogenation scenario,the operation and dynamic response characteristics of the system were tested to find the best operating conditions of the system.The dehydrogenation experiments showed that the conversion rate of cyclohexane dehydrogenation reached 99.82%at 360°C and 1.5 h^-1liquid hourly space velocity,and the conversion of cyclohexane could remain stable for a long time.The total concentration of cyclohexane and benzene after gas-liquid separation was less than 2%at the best operating condition,and the methane content was less than 200 ppm,so that the product of dehydrogenation met the hydrogen standard for hydrogen fuel cells.Secondly,for the scenario of large-scale power supply by fuel cells,this paper proposed a scheme of hydrogen production by ammonia decomposition to supply fuel cells.In order to provide the operating conditions for the fuel cell stack,a k W-level fuel cell system for energy supply by ammonia decomposition was designed and built,and a monitoring program for this system was established.The experiment results indicated that the fuel cell system met the operating requirements of the fuel cell stack,and the stack discharged stably at different current densities,its maximum power reached3.2 k W.We combined the ammonia decomposition reactor with a hydrogen fuel cell,the experiment results showed that the hydrogen production from ammonia decomposition can reached a power which is similar to the condition of supplying pure hydrogen,which verified the feasibility of the ammonia-powered fuel cell system.