Study on Heat Storage Performance of Various Mixture Combinations of Stones, Sand, and Thermal Oil

LI Lingxu; CHEN Longxiang; YE Kai

doi:10.12096/j.2096-4528.pgt.24055

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Study on Heat Storage Performance of Various Mixture Combinations of Stones, Sand, and Thermal Oil

Energy Storage | 更新时间：2026-06-29

- Study on Heat Storage Performance of Various Mixture Combinations of Stones, Sand, and Thermal Oil
- Power Generation Technology Vol. 46, Issue 6, Pages: 1192-1199(2025)
- 作者机构：
  
  1.福州大学先进制造学院，福建省泉州市 362251
  2.中国科学院海西研究院泉州装备制造研究中心，福建省泉州市 362000
  3.中国科学院大学福建学院，福建省泉州市 350000
- 作者简介：
- 基金信息：
  
  Science and Technology Plan of Fujian Province(2021H0045);Science and Technology Plan of Quanzhou City(2022C019R)
- DOI：10.12096/j.2096-4528.pgt.24055
  CLC： TK 02
- Received：02 September 2024，
  
  Revised：2024-11-18，
  
  Published：31 December 2025
- 稿件说明：
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李凌旭,陈龙祥,叶楷.基于石块-沙子-导热油的多种组合混合储热性能研究[J].发电技术,2025,46(06):1192-1199.

LI Lingxu,CHEN Longxiang,YE Kai.Study on Heat Storage Performance of Various Mixture Combinations of Stones, Sand, and Thermal Oil[J].Power Generation Technology,2025,46(06):1192-1199.
李凌旭,陈龙祥,叶楷.基于石块-沙子-导热油的多种组合混合储热性能研究[J].发电技术,2025,46(06):1192-1199. DOI： 10.12096/j.2096-4528.pgt.24055.

LI Lingxu,CHEN Longxiang,YE Kai.Study on Heat Storage Performance of Various Mixture Combinations of Stones, Sand, and Thermal Oil[J].Power Generation Technology,2025,46(06):1192-1199. DOI： 10.12096/j.2096-4528.pgt.24055.

摘要

目的

传统的混凝土储热系统易在循环储热过程中开裂，导致整体储热量储热功率急剧下降，严重影响系统寿命，增加储热成本。为此，提出了一种石块、沙子和导热油多元混合的储热方式。

方法

采用计算流体动力学(computational fluid dynamics，CFD)仿真技术，针对不同储热介质的储热过程进行模拟研究。

结果

与未开裂混凝土相比，开裂混凝土储热量下降了23.1%。相同储热条件下，粗沙储热效果优于细沙。粗沙与导热油混合的储热量比开裂混凝土储热量高7.2%，而以沙子-石块-导热油混合作为储热介质的储热量比开裂混凝土的储热量高20.5%。放出热量略低于储存热量，开裂混凝土的放热量比未开裂混凝土放热量低21.7%，比沙子-石块-导热油混合作为储热介质的放热量低18.86%。通过对成本计算，石块混合沙子和导热油作为储热介质的储热系统，具有更高储热量的同时，固定成本和后期维护成本较低。

结论

这种多元混合储热方式能有效避免混凝土开裂问题，提高储热效率和降低成本，对于推动储热技术的发展和应用具有重要意义。

Abstract

Objectives

Traditional concrete thermal energy storage systems are prone to cracking during cyclic heat storage processes

leading to a sharp decline in overall heat storage capacity and power

which severely affects system lifespan and increases heat storage costs. To mitigate these issues

a multi-component mixed heat storage method incorporating stones

sand

and thermal oil is proposed.

Methods

Utilizing computational fluid dynamics (CFD) simulation technology

the heat storage processes of different heat storage media are simulated and investigated.

Results

Cracked concrete experiences a 23.1% reduction in heat storage capacity compared to uncracked concrete. Under the same heat storage conditions

coarse sand demonstrates better heat storage performance than fine sand. The mixture of coarse sand and thermal oil exhibits a 7.2% higher heat storage capacity than that of cracked concrete. Furthermore

the mixture of sand

stones

and thermal oil increases heat storage capacity by 20.5% relative to cracked concrete used as heat storage medium. The released heat is slightly lower than the stored heat. The heat released by cracked concrete is 21.7% lower than that of uncracked concrete and 18.86% lower than that of the mixture of sand

stones

and thermal oil used as the heat storage medium. Cost calculations further reveal that the thermal energy storage system using the mixture of stones

sand

and thermal oil as the storage medium achieves higher heat storage capacity while resulting in lower fixed and maintenance costs.

Conclusions

This multi-component mixed heat storage method can effectively address concrete cracking issues

enhance heat storage efficiency

and reduce costs

which is of great significance for advancing the development and application of heat storage technologies.

关键词

Keywords

references

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