通过CuO / Cu <sub>2</sub> O氧化还原循环进行高温热化学储热：从材料合成到填充床反应器工程和循环运行,Energy & Fuels

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通过CuO / Cu ₂ O氧化还原循环进行高温热化学储热：从材料合成到填充床反应器工程和循环运行
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-11-26 , DOI: 10.1021/acs.energyfuels.0c02572
Marco Gigantino ₁ , Sebastian Sas Brunser ₁ , Aldo Steinfeld ₁

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考虑将基于CuO / Cu ₂ O对的热化学氧化还原循环用于集中太阳能应用中的高温储热。开发了一种以氧化钇稳定的氧化锆（YSZ）为烧结抑制剂的多孔CuO基颗粒的合成方法。合成的颗粒在950至1050°C的空气中，在100个连续循环中显示出高且可逆的氧化还原转化率，并且与吸热/放热氧化还原反应相关的重量能量存储密度在470至615 kJ / kg的范围内（50至65） wt％CuO–YSZ颗粒。设计了实验室规模的填充床反应器，用于颗粒和空气/ N ₂之间的直接传热同时用作气态反应物和传热流体的流体。该反应器用于执行两组30个连续的氧化还原循环，这些循环经历温度波动（等压）或压力波动（等温）运行模式。在两种模式下均可实现稳定的充放电循环性能，在空气条件下工作时，还原/氧化起始温度（≤10°C）与放电温度在1020–1025°C范围内自稳定之间具有较窄的热滞流。

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High-Temperature Thermochemical Heat Storage via the CuO/Cu2O Redox Cycle: From Material Synthesis to Packed-Bed Reactor Engineering and Cyclic Operation

A thermochemical redox cycle based on the CuO/Cu₂O pair is considered for high-temperature heat storage in concentrated solar energy applications. A synthesis method is developed for the manufacture of porous CuO-based granules with yttria-stabilized zirconia (YSZ) as the sintering inhibitor. The synthesized granules exhibit high and reversible redox conversion over 100 consecutive cycles in air between 950 and 1050 °C and yield a gravimetric energy storage density associated with the endothermic/exothermic redox reactions in the range of 470 to 615 kJ/kg for 50 to 65 wt % CuO–YSZ granules. A lab-scale packed-bed reactor is designed for direct heat transfer between the granules and an air/N₂ flow serving simultaneously as the gaseous reactant and heat transfer fluid. The reactor is applied to perform two sets of 30 consecutive redox cycles subjected to either temperature-swing (isobaric) or pressure-swing (isothermal) operational mode. Stable charging–discharging cycling performances are achieved in both modes, with narrow thermal hysteresis between reduction/oxidation onset temperatures (≤10 °C) and self-stabilization of the discharging temperature in the range of 1020–1025 °C when operating under an air flow.

更新日期：2020-12-17

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