混合加热反应器内Ca（OH）2/CaO热化学储能体系实验

doi:10.19799/j.cnki.2095-4239.2022.0450

摘要/Abstract

摘要：

热化学储能(thermochemical energy storage，TCES)技术是未来可再生能源社会最具前景的技术之一。Ca(OH)₂/CaO TCES体系因其储能密度较高、环境友好、廉价等特点受到人们的广泛关注。本工作建立了一个直接与间接混合加热的固定床反应器实验平台，进行了空气氛围下的储/释热实验，探究了混合加热反应器内的储热特性与限制因素，并在此基础上探究了在反应器尺度改善循环性能的可行方案。实验研究表明，采用直接与间接混合加热的方式，使得反应呈现向心推进与逐层推进相结合的形式，增进了储能反应的速率；反应性能随着循环次数增多逐渐下降，5次循环后的储能反应最大转化率降低了5.6%，10次循环相较于5次循环的反应最大转化率降低了3.8%。TG实验与粒径测试结果表明，空气中CO₂是造成循环性能下降的主要因素；提高脱水温度可以有效恢复循环性能，650 ℃时所提供的过余温度可以有效降低反应物中CaCO₃的含量。

关键词: 热化学储能, Ca(OH)₂/CaO, 反应器, 实验研究

Abstract:

Thermochemical energy storage (TCES) technology holds promise for a civilization that wants to run solely on renewable sources. The Ca(OH)₂/CaO TCES system based on calcium looping has attracted a lot of attention due to its high energy storage density, prolonged energy storage period, and environmental friendliness. An experimental platform of direct and indirect mixed heating fixed-bed reactors was established in this study. A typical heat storage/release experiment under an air atmosphere was carried out in order to investigate the mixed heating reactor's heat storage characteristics and limiting constraints. In light of this, on this basis, a workable plan to enhance the cycling performance at the reactor scale was investigated. The experimental investigation of heat storage demonstrates that the combination of centripetal and layer-by-layer advancements can be achieved by using direct and indirect mixed heating, which accelerates the rate of energy storage response. The heat storage and release continuous trials show that the conversion rate of energy storage reaction drops by 5.6% after five cycles, and the maximum conversion rate of ten cycles decreases by 3.8% compared with five cycles. The reaction performance gradually declines with more cycles. TG and particle size test findings indicate that the CO₂ of air is the primary cause of the decline in cycling performance. The reaction performance recovery experiment in the energy storage stage demonstrates that raising the dehydration temperature can successfully restore the cycle performance, and the excess temperature provided at 650 ℃ can successfully lower the content of CaCO₃ in the reactant.

Key words: thermochemical energy storage, Ca(OH)₂/CaO, reactor, experiment research

中图分类号:

O 642.3

张志浩, 靳晓刚, 包恒兴, 凌祥. 混合加热反应器内Ca（OH）₂/CaO热化学储能体系实验[J]. 储能科学与技术, 2023, 12(1): 227-235.

Zhihao ZHANG, Xiaogang JIN, Hengxing BAO, Xiang LING. Experimental study of Ca（OH）₂/CaO thermochemical energy storage in a mixed heating reactor[J]. Energy Storage Science and Technology, 2023, 12(1): 227-235.

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仪器	型号	参数
NI数据采集仪	NI PXle-1071
温湿度传感器	TESTO-6681	0～100%RH； ±0.1%
压力表	95-11-417	0～0.16 MPa
压差变送器	EJA110A	0～15 kPa； ±0.065%
热电偶	WRNK-191	0～1000 ℃； ±1 ℃
涡街流量计	DY015-EALSR4-4D/SY/QCR/Z	0～40 m³/h； ±1%
CO₂浓度(体积分数)检测仪	MOT500-CO₂-B-IR	0～30%；±1%

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混合加热反应器内Ca（OH）₂/CaO热化学储能体系实验

Experimental study of Ca（OH）₂/CaO thermochemical energy storage in a mixed heating reactor

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