Development of conversion technology for concentrated solar thermal energy to solar hydrogen using continuous two step water splitting process

在旋转式太阳能电抗器的研制中，将本项目先前制造的1^<st>型旋转式太阳能电抗器（1kW）的八步工艺改进为三步工艺。设计并制作了10kW旋转式太阳能反应器的2^<和>模型（具体为：转子直径= 50cm, To_2=1500℃，集中束流通量=2100kW/m^2, ωt=2.5 rpm）。以ni -铁氧体为反应陶瓷，在2^<和>模型上进行了性能测试，在To_2=1250℃时，释放的O_2和生成H2的蒸汽回收率达到80%。由于To_2最高温度为125℃的限制，未能实现H2的生成步骤。开发了太阳聚光系统仿真器，用于估算东京科技公司落束式太阳聚光系统（TIT-BD系统）在旋转式太阳反应器使用焦点处的实际通量大小，并开发了CG软件，用CG表达对TIT-BD系统的仿真结果。在定日镜的研制过程中，发现GPS系统作为太阳跟踪的调节系统优于三点识别系统。在ti- bd系统的开发中，进行了多环中心反射系统、空腔式熔盐接收器和横束定日镜场设计。在反应陶瓷的开发过程中，研究了YSZ与铁氧体之间的固溶体体系，发现该体系可用于旋转式太阳能反应器的两步水裂解工艺。在旋转式太阳反应器o_2释放步骤的试验中，通过对旋转式太阳反应器o_2释放步骤的陶瓷进行集中红外光束照射，发现反应陶瓷在快速升温过程中存在中间阶段。

In the development on the rotary type solar reactor, the eight-step process of the 1^<st> model of the rotary type solar reactor (1kW), which had been fabricated previously on this project, has been improved to three-step process. The 2^<nd> model of the 10kW rotary type solar reactor was designed and fabricated (the specific ; diameter of the rotor= 50cm, To_2=1500℃, concentrated beam flux=2100kW/m^2, ωt=2.5 rpm. The performance test on the 2^<nd> model was carried out using the Ni-ferrite as reactive ceramics, and 80% recovery of the released O_2 and steam for H2 generation were obtained at To_2=1250℃. The H2 generation step was not achieved because of the limitation of the maximum temperature of To_2=125O℃. The simulator for solar concentration system was developed to estimate the practical flux magnitude in the Tokyo Tech Beam-down solar concentration system (TIT-BD system) at the focus point for using the rotary type solar reactor, and the CG software was developed to express the simulation result on TIT-BD system by CG. In the development on the heliostat, GPS system as a regulation system for tracking the sun was found to be superior to the three points recognition system. In the, development on the TIT-BD system, multi-ring central reflector system, cavity type molten salt receiver, and cross-beam heliostat field design were developed.In the development of the reactive ceramics, the solid solution system between YSZ and the ferrites has been studied and was found to be used for the two-step water splitting process using rotary type solar reactor. In test of the O_2-releasing step of rotary type solar reactor, an intermediate stage of the reactive ceramics was discovered during a rapid temperature increase by the concentrated infra-red beam irradiation to the ceramics in the O_2-releasing step in the rotary type solar reactor.