Development Study on Solar Hydrogen Production with Concentrated-Solar-Beam Reactive Ceramics

在ni -铁氧体（反应陶瓷）释放o2太阳能反应器的研制中，通过在1473 ~ 1773k之间的温度波动，可以成功地重复进行两步水裂解。针对锌铁氧体体系，基于回收ZnO+Fe3O4粉末混合物的概念，设计了一种新型太阳能反应器，并制作了实用的高温热测试仪器，以提高锌铁氧体体系的反应性。通过实验发现，采用zn -铁氧体体系的太阳能反应器可以在1573K左右的温度下进行o2释放过程。同时，设计制作了圆筒式旋转反应器，利用红外成像炉可连续重复o2释放和h2生成步骤。实验结果表明，筒式旋转反应器在两步水分解工艺中具有较高的效率。对塔式太阳能聚光电站的光学系统进行了设计，发现在高太阳角度下，即使至少需要2700聚光，也可以达到3000聚光，以满足2000聚光的实际要求。吸热反应进行时，2000kW/m2的束流通量消耗6.22mol/m2的YSZ01NF，说明双管式太阳能反应器（圆柱形旋转反应器）的固体反应床厚度为几cm。因此，将新开发的YSZ01 NF反应陶瓷与双联式太阳能反应器相结合，通过太阳能/化学能转换，充分利用高太阳束流，实现太阳能制氢。

In the development of solar reactor for O2-releasing with Ni-ferrite (reactive ceramics), the two-step water splitting can be successfully proceeded repeatedly by temperature swing between 1473-1773K. For the Zn-ferrite system, a new solar reactor is designed based on the concept of recovering the powder mixture of ZnO+Fe3O4, and fabricated the practical testing instrument with a high temperature heat, for enhancing the reactivity of the Zn-ferrite system.With this experiment, it was found that the solar reactor adopting the Zn-ferrite system can be developed for proceeding the O2-releasing process at the temperature around 1573K. Also, the cylindrical rotary reactor was newly designed and fabricated, with which the O2-releasing and H2-generation steps can be continuously repeated using infra red imaging furnace. It was confirmed that the cylindrical rotary reactor can work with a high efficiency for the two step water splitting process.The optical system of the tower solar concentration plant was designed, and it was found that 3000 concentration can be obtained at the high solar angle, even though 2700 concentration is at least required, for the practical requirement of 2000 solar concentration.When the endothermic reaction proceeds, 6.22mol/m2 of YSZ01NF is consumed for 2000kW/m2 of the beam flux, indicating that the thickness of the solid reaction bed is several cm for the dual type solar reactor (cylindrical rotary reactor). Thus, combining the newly developed reactive ceramics of YSZ01 NF and the dual type solar reactor, the solar hydrogen production can be realized by making the best use of a high solar beam flux through the solar/chemical energy conversion.