Analysis of Flowing and Heat Transfer of Commercial Molten Nitrate in Porous Foundation Material

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  • State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China

网络出版日期: 2023-11-27

基金资助

This work was supported by the National Natural Science Foundation of China (52036008).

Analysis of Flowing and Heat Transfer of Commercial Molten Nitrate in Porous Foundation Material

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  • State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China

Online published: 2023-11-27

Supported by

This work was supported by the National Natural Science Foundation of China (52036008).

摘要

熔盐储热罐的泄漏事故可能会造成太阳能光热电站的停产并带来巨大的经济损失。本文研究了商业常用熔融硝酸盐泄漏在热态多孔地基材料中的传热和流动过程。研究表明,Solar Salt(60wt% NaNO3-40wt%KNO3)、Hitec XL(7wt% NaNO3-45wt% KNO3-48wt% Ca(NO3)2) 和Hitec(7wt% NaNO3-53wt%KNO3-40wt%NaNO2)熔盐泄漏过程中地基材料的升温速率均呈现沿深度的方向先升高后降低再升高的趋势。升温速率和渗流深度随熔盐运行温度的升高而明显增加,而平均渗流宽度变化较小。受熔融盐凝固点的影响,Hitec XL和Hitec熔盐泄漏在地基材料中的升温速率和渗流深度显著大于在相同的运行温度下Solar Salt泄漏时的值。由于熔盐粘度的影响,Hitec在泄漏和渗流过程中比Hitec XL具有更高的升温速率和更大的渗流范围。该研究对于高温熔盐储罐泄漏事故的环境污染处理和泄漏检测装置的安装等工作具有指导意义。

本文引用格式

SHI Hua, ZHOU Hao, MENG Hanxiao, LV Laiquan, LIU Tianxiao, ZUO Yuhang, CEN Kefa . Analysis of Flowing and Heat Transfer of Commercial Molten Nitrate in Porous Foundation Material[J]. 热科学学报, 2023 , 32(4) : 1455 -1465 . DOI: 10.1007/s11630-023-1804-0

Abstract

The leakage accident of molten salt in the thermal storage tank will cause the shutdown and enormous economic losses of Concentrated Solar Power plants. This study investigates the heat transfer and flow characteristic of commercial molten nitrates leaking in the thermal state porous foundation material. The migration width and depth of three molten nitrates, Solar Salt (60 wt% NaNO3-40 wt%KNO3), Hitec XL (7 wt% NaNO3-45 wt% KNO3-48 wt% Ca(NO3)2) and Hitec (7 wt% NaNO3-53 wt%KNO3-40 wt%NaNO2), are obtained at different operating temperatures. Experimental results indicate that the temperature rising rate of foundation material in the nitrate leaking process has a trend of first increasing rapidly and then decreasing, and then it increases slightly as the depth increases. The temperature rising rate increases obviously with increasing operating temperature of the molten salt. With the increase of the operating temperature, the distances from the storage tank bottom to solid salt in foundation and the total migration depths both increase obviously, while the average migrating widths change slightly. At the same operating temperature, the temperature rising rate of the foundation material where Hitec XL and Hitec salt leak is significantly greater than that with Solar Salt, which is closely related to the melting points of molten salts. The migration depth of Hitec is 95.03% greater than that of Solar Salt and 19.11% larger than that of Hitec XL at the operating temperature of 300°C. Compared with Hitec XL, the leakage of Hitec with a smaller viscosity has a larger temperature rising rate and a wider and deeper transporting range during the leakage process. This work could guide the installation locations of the leak detection devices for high temperature storage tank and the environmental treatment of leaking accident.

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