基于氧化铈还原-氧化循环的两级热化学分水反应器的数值和实验研究

IF 9.9 1区工程技术 Q1 ENERGY & FUELS

Energy Conversion and Management Pub Date : 2024-11-15 DOI:10.1016/j.enconman.2024.119217

Paula Rojas, Nicolás Alegría, Mario Toledo

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引用次数: 0

摘要

气候变化表明，有必要使全球能源结构去碳化，而绿色氢气已成为一种前景广阔的替代燃料。在此框架下，本研究探讨了利用抛物面接收器和光伏加热器加热的两级热化学分水反应器生产绿色氢气的问题。研究提出了一个数学模型，用于模拟由多孔氧化铈介质组成的太阳能反应堆的还原-氧化过程。实验和数值热曲线显示出良好的一致性，还原阶段温度较高（1100 K），氧化阶段温度较低（860-715 K）。在实验和数值测试中，绿色氢气产量的最大值分别接近 100 ppm 和 2000 μmolH2O/gCeO2。结论是，光伏加热器比太阳能浓缩加热器更适用，通过延长还原-氧化阶段的停留时间，可以提高绿色氢气产量。

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Numerical and experimental investigation of a two-stage thermochemical water-splitting reactor based on a cerium oxide reduction–oxidation cycle

Climate change has made clear the need to decarbonize the global energy matrix, and green hydrogen has emerged as a promising alternative fuel. In this framework, this work investigates the green hydrogen production by means of a two-stage thermochemical water-splitting reactor heated by both a parabolic dish receiver and a photovoltaic heater. A mathematical model is proposed to simulate reduction–oxidation process for the solar-powered reactor composed of a porous cerium oxide medium. Experimental and numerical thermal profiles show good agreement, with a high temperature in the reduction stage (>1100 K) and a lower temperature in the oxidation stage (860–715 K). Green hydrogen productions show maximum values close to 100 ppm and 2000

μ m o l_{H_{2} O} / g_{C e O_{2}}

, for experimental and numerical tests, respectively. It is concluded that the photovoltaic heater is more relevant than the solar concentration heater, and that green hydrogen production could be improved by allowing longer residence times for the reduction–oxidation stages.

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来源期刊

Energy Conversion and Management 工程技术-力学

CiteScore

19.00

自引率

11.50%

发文量

1304

审稿时长

17 days

期刊介绍： The journal Energy Conversion and Management provides a forum for publishing original contributions and comprehensive technical review articles of interdisciplinary and original research on all important energy topics. The topics considered include energy generation, utilization, conversion, storage, transmission, conservation, management and sustainability. These topics typically involve various types of energy such as mechanical, thermal, nuclear, chemical, electromagnetic, magnetic and electric. These energy types cover all known energy resources, including renewable resources (e.g., solar, bio, hydro, wind, geothermal and ocean energy), fossil fuels and nuclear resources.