储能科学与技术 ›› 2020, Vol. 9 ›› Issue (4): 1074-1081.doi: 10.19799/j.cnki.2095-4239.2020.0067

• 储能材料与器件 • 上一篇    下一篇

储释冷循环对岩石材料性能的影响

李国跃1,2(), 林曦鹏1,3, 王亮1,2,3, 王艺斐1,3, 彭珑1,3, 陈海生1,2,3(), 谢宁宁4   

  1. 1.中国科学院工程热物理研究所，北京 100190
    2.中国科学院大学，北京 100049
    3.中国科学院清洁能源创新研究院，辽宁 大连 116023
    4.国家能源大规模物理储能技术（毕节）研发中心，贵州 毕节 551700
  • 收稿日期:2020-02-12 修回日期:2020-02-24 出版日期:2020-07-05 发布日期:2020-06-30
  • 通讯作者: 陈海生 E-mail:liguoyue@iet.cn;chen_hs@mail.etp.ac.cn
  • 作者简介:李国跃（1994—），男，硕士研究生，主要研究方向为蓄冷蓄热，E-mail：liguoyue@iet.cn
  • 基金资助:
    国家自然科学基金(51906246);国家重点研发计划项目(2018YFB0905500);贵州省科技基金计划项目([2017]1162)

Effects of the charge-discharge cold cycles on performance of the rock materials

LI"Guoyue1,2(), LIN"Xipeng1,3, WANG"Liang1,2,3, WANG"Yifei1,3, PENG"Long1,3, CHEN"Haisheng1,2,3(), XIE"Ningning4   

  1. 1.Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2.University of Chinese Academy of Sciences, Beijing 100049, China
    3.Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
    4.National Energy Large Scale Physical Energy Storage Technologies Research and Development Center(Bijie), Bijie 551700, Guizhou, China
  • Received:2020-02-12 Revised:2020-02-24 Online:2020-07-05 Published:2020-06-30
  • Contact: Haisheng CHEN E-mail:liguoyue@iet.cn;chen_hs@mail.etp.ac.cn

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摘要：

天然岩石作为深冷储能材料具有适宜温度范围宽、成本低和材料易得等优点，其在深冷温区的热物性和循环稳定性是影响蓄冷单元性能的关键。本文为探究储/释冷循环对岩石深冷储能材料性能的影响，建立了深冷储/释循环实验台，研究了千次储/释冷循环对大理石、花岗岩、石灰岩和玄武岩四种岩石的热物性和强度的影响。实验结果表明，在千次储/释冷循环前后，大理石、玄武岩和石灰岩的外观均无发生明显变化，而花岗岩会存在少量的裂纹和脱落。循环储/释冷千次对岩石的密度、导热系数和比热容均无明显的影响。大理石和玄武岩的抗压强度随着循环次数的增加而基本不变；花岗岩和石灰岩的抗压强度随着循环次数的增加而有较大的提高。基于实验结果获得了在深冷至常温区间内四种岩石材料的导热系数和比热容随温度变化的关系式。对比分析表明，四种岩石的体积储能密度存在较大差异，石灰岩的体积储能密度最大，而花岗岩的最小。本研究将为深冷储能单元及系统的研发提供重要基础数据。

关键词: 填充床, 深冷蓄冷, 储释循环, 热物性, 储能

Abstract:

Natural rocks are cryogenic energy storage materials and exhibit a wide suitable temperature range, low cost, and easy availability. Their thermophysical properties and cycle stabilities in cryogenic temperature regions are key factors that affect the performance of the cold storage units. An experimental bench of automatic charge and discharge was designed and constructed to explore the effects of the charge-discharge cold cycles on the properties of the cryogenic energy storage materials. The effects of 1000 charge-discharge cold cycles on the thermophysical properties and strengths of four types of natural rocks (i.e., marble, granite, limestone, and basalt) are studied. Results show that the appearance of marble, basalt, and limestone before and after the charge-discharge cold cycles remains unchanged. However, granite shows some cracks and peelings. The density, thermal conductivity, and specific heat of the rocks were not significantly affected after 1,000 charge-discharge cold cycles. The compressive strengths of marble and basalt are unchanged, and the compressive strengths of granite and limestone are observed to significantly improve. Based on the experimental results, the relations between the thermal conductivity and specific heat of four rock materials and the temperatures in the cryogenic interval from cryogenic to normal temperatures were obtained. Comparative analysis shows that the volume energy storage densities of the four types of rock exhibit a considerable difference. Limestone has the largest volume energy storage density, whereas granite has the smallest volume energy storage density. This research will provide important basic data for developing cryogenic energy storage units and systems.

Key words: packed bed, cryogenic cold storage, charge-discharge cycle, thermal physical properties, energy storage

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