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| 1 | Radiative heat transfer and thermal characteristics of Fe-based oxides coated SiC and Alumina RPC structures as integrated solar thermochemical reactor显示文摘This paper investigated radiative heat transfer and thermal characteristics of Fe-based oxides coated SiC and Alumina reticulated porous ceramic structures as integrated solar thermochemical reactor.High-flux solar radiation absorption and axial temperature distribution in the ceramic foams reactor were analyzed by adopting surface-to-surface radiation model coupled to the P1approximation for radiation heat transfer.The radiative heat transfer and thermal characteristics of different foam-type RPC structures,including SiC,CeO_2,FeAl_2O_4,NiFeAlO_4,Fe_3O_4/SiC,and NiFe_2O_4/SiC were evaluated.The mass flow rate and foam structural parameters,including the permeability,pore mean cell size,and extinction coefficients have significantly affected the axial temperature distribution,pressure drop,heat transfer,and fluid flow.Integrated porous structure to the solar receiver could maximize the incorporation of redox powder in the reacting medium,lower the pressure drop,and enhance the thermal performance of the thermochemical reacting system.SiC structure was the candidate materials in the case where more heat flux and high axial temperature distribution is needed.However,Fe-based oxide coated Al_2O_3structure could be considered regarding the heat transfer enhancement along with the catalyst activity of oxygen carriers for solar thermochemical reacting system performance. | GUENE LOUGOU Bachirou SHUAI Yong PAN RuMing CHAFFA Gédéon AHOUANNOU Clément ZHANG Hao TAN HePing | 2018 | Science China(Technological Sciences)2018，61，12： | 2 |
| 2 | Thermal characteristics and thermal stress analysis of solar thermochemical reactor under high-flux concentrated solar irradiation显示文摘Nowadays, using a solar-driven thermochemical reaction system to convert greenhouse gases into high-quality liquid fuels has been proven to be an effective way to address the growing depletion of traditional fossil fuels. However, the utilization of highlyconcentrated solar irradiation runs the high risk of reactor damage issues resulting from thermal stress concentration, which seriously threatens the security and reliability of the total reactor system. In this study, the thermal radiation distribution and thermo-mechanical process in a volumetric reactor were numerically investigated by combining Monte Carlo ray-tracing method with computational fluid dynamics method. Based on the experimental results and thermal characteristic analysis, the formation mechanism of thermal stress concentration and the strategies of improving thermal stress distribution were discussed in detail.The simulation results indicate a great possibility of reactor damage at about 1000℃ operating temperature and 9.0 k W lamp power, which is well-matched with related experimental results. The ceramic damage typically occurs at the inner edges of the through-holes, including the aperture, the gas inlet, and the thermocouple hole, then extends along the lines connecting these holes and finally causes brittle fracture. By reasonable control of the opening direction and the distance between the throughholes, the maximum compressive stress can be reduced by 21.78%. | ZHANG Hao SHUAI Yong GUENE LOUGOU Bachirou JIANG BoShu HUANG Xing | 2020 | Science China(Technological Sciences)2020，63，9： | 1 |
| 3 | CH_(4)/H_(2)O/H_(2)辅助热催化CO_(2)转化机制显示文摘随着热化学技术及相关反应机制认知的不断进步,二氧化碳回收转化为高附加值燃料或其他化工产品的清洁能源技术正逐步走向成熟。同时,因社会工业进步及人类生产活动急剧增加了大气中的二氧化碳浓度,且已远超地球正常发展的浓度阈值,这使得基于二氧化碳转化的零碳高效可再生清洁能源技术成为世界各国为应对全球能源与环境问题亟待实现的关键技术。鉴于二氧化碳热催化转化的基本原理、关键材料和反应系统的相关研究对于推动该技术的工业化进程有着至关重要的作用,本文报道了二氧化碳热催化转化机制相关的最新进展,重点阐述了对热催化过程具有辅助作用的活性气体(包括H_(2)O、CH_(4)和H_(2))在实现高水平二氧化碳回收转换与高效合成气生产方面的催化机制,其核心体现在优化的反应动力学与温和条件下的热力学优势。 | 马丹妮 颜天天 张烁 GUENE LOUGOU Bachirou 张昊 潘如明 帅永 | 2023 | 能源环境保护2023，37，6： | 0 |
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