New Solar Water-Splitting Reactor With Ferrite Particles in an Internally Circulating Fluidized Bed
New Solar Water-Splitting Reactor With Ferrite Particles in an Internally Circulating Fluidized Bed
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DOI：
10.1115/1.3027511
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发表时间：
2009-02-01
影响因子：
2.3
通讯作者：
Kodama, Tatsuya
中科院分区：
文献类型：
--
作者：
Gokon, Nobuyuki;Takahashi, Shingo;Kodama, Tatsuya
金属氧化物的热还原作为热化学两步水分解循环的一部分，需要开发在1000-1500摄氏度下运行的高温太阳能反应堆。通过金属氧化物颗粒的直接太阳能吸收提供了到反应位点的直接有效的热传递。本文描述了一个有窗口的小型反应堆的实验结果，该反应堆使用内循环流化床的金属氧化物颗粒在直接太阳模拟的Xe束辐照下进行反应。集中的X射线束照射直接加热金属氧化物颗粒的内循环流化床。NiFe（2）O（4）/m-ZrO（2）（氧化锆载体上的Ni-铁氧体）颗粒作为工作氧化还原材料负载，并通过集中的X射线束照射进行热还原。在单独的步骤中，热还原的样品在1000摄氏度下用蒸汽氧化回镍铁氧体。铁氧体的转换效率达到44%（+/-1.0%），这是使用反应器在1 kW的入射白炽灯功率下实现的。考察了预热温度和NiFe 2 O 4/mZrO 2颗粒尺寸对内循环流化床热还原反应器性能的影响。
The thermal reduction of metal oxides as part of a thermochemical two-step water-splitting cycle requires the development of a high-temperature solar reactor operating at 1000-1500 degrees C. Direct solar energy absorption by metal-oxide particles provides direct efficient heat transfer to the reaction site. This paper describes the experimental results of a windowed small reactor using an internally circulating fluidized bed of reacting metal-oxide particles under direct solar-simulated Xe-beam irradiation. Concentrated Xe-beam irradiation directly heats the internally circulating fluidized bed of metal-oxide particles. NiFe(2)O(4)/m-ZrO(2) (Ni-ferrite on zirconia support) particles are loaded as the working redox material and are thermally reduced by concentrated Xe-beam irradiation. In a separate step, the thermally reduced sample is oxidized back to Ni-ferrite with steam at 1000 degrees C. The conversion efficiency of ferrite reached 44% (+/- 1.0%), which was achieved using the reactor at 1 kW of incident Xe lamp power. The effects of preheating temperature and NiFe(2)O(4)/m-ZrO(2) particle size on the performance of the reactor for thermal reduction using an internally circulating fluidized bed were evaluated.