고온 태양열을 이용한 열화학 사이클의 수소 생산

초록

Two-step water splitting process experiment is performed using concentrated solar radiation of dish type solar thermal system. The foam device coated with powder was used as a water splitting device and a solar thermal converter. The inner part of the reactor designed to withstand 1600℃ above and composed with alumina-oxide. The performance of device is examined by estimation of hydrogen production rate on consecutive two-step cycles. Optimum reaction temperatures of the oxygen releasing and hydrogen generation reactions with Ni-ferrite, examined with solar thermal simulator, are 1400℃ and 1100℃, respectively. And these reaction conditions are validated with solar thermal system in field. Reaction time of T-R step and W-D step were adjusted with fi디d conditions. For the 1st cycle(oxygen releasing step) time 60min at around 1400℃ of foam device temperature and 2nd cycle(hydrogen generation step)time was 30min at around 1100℃ of foam device temperature(60min and 30min are optimized reaction time in lab with solar thermal simulator and these reaction times are adjusted in this study). As a result, the after end of a 2nd cycle, the crack is created at foam device. The total volume of hydrogen production with 1st cycle is 782.87ml and 2nd cycle production is 48.71ml. The hydrogen production rate is decreased at repeated cycles. Also the ferrite conversion is decreased 87.39% to 5.44%.