云遮挡条件下熔融盐吸热管防护的数值模拟

doi:10.11930/j.issn.1004-9649.201903071

中国电力 ›› 2020, Vol. 53 ›› Issue (11): 220-226.DOI: 10.11930/j.issn.1004-9649.201903071

云遮挡条件下熔融盐吸热管防护的数值模拟

冯蕾^1,2, 肖刚², 郭磊², 杨承刚³, 廖海燕¹

1. 神华国华(北京)电力研究院有限公司，北京 100024;
2. 浙江大学热能工程研究所，浙江杭州 310027;
3. 生态环境部核与辐射安全中心，北京 102400

收稿日期:2019-03-10 修回日期:2019-09-20 出版日期:2020-11-05 发布日期:2020-11-05
作者简介:冯蕾（1984—），女，博士，从事光热太阳能发电技术研究，E-mail：16810122@chnenergy.com.cn;杨承刚(1987—)，男，通信作者，硕士，工程师，从事进口民用核安全设备技术审评及大型电站新型高效多联供技术研究，E-mail：yangchenggang007@126.com。

Numerical Simulations on the Protection of the Molten Salt Thermal Tube under Cloud Occlusion

FENG Lei^1,2, XIAO Gang², GUO Lei², YANG Chenggang³, LIAO Haiyan¹

1. Shenhua Guohua (Beijing) Electric Power Research Institute Co., Ltd., Beijing 100024, China;
2. Institute of Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China;
3. Nuclear and Radiation Safety Centre MEE, Beijing 102400, China

Received:2019-03-10 Revised:2019-09-20 Online:2020-11-05 Published:2020-11-05

摘要/Abstract

摘要： 基于吸热器单管模型，采用Fluent数值软件模拟研究云遮挡发生时及防护后，不同热流密度、熔融盐流速、表面对流换热系数吸热管温降特性的影响。研究结果表明：辐射热流密度对于熔盐吸热管壁面温度降低至接近凝固点的时间影响有限；对流换热系数越大越容易出现熔盐凝固；熔盐进口流速越低，熔盐出口温度降低至接近凝固点的时间越长；单根吸热管壁面温度下降至熔盐最低使用温度时间约为20 s，采用加装防护装置及降低熔盐进口流速相结合的防护策略，可将其时间延长近6倍，最长延缓至143 s。

关键词: 吸热管, 熔融盐, 温降特性, 云遮挡

Abstract: Based on the single tube model of the receiver, the temperature drop characteristics of the endothermic tube such as the heat flux, molten salt flow rate and surface convection heat transfer coefficient were studied through numerical simulations on the scenarios under cloud occlusion before and after protection schemes implemented. The results exhibit limited impacts of radiation heat flux density on the elapsed time for temperature at the molten salt outlet to decrease to close to the solidification point. Moreover, the greater the convection heat transfer coefficient, the more likely the molten salt solidification may appear; while the lower the molten salt inlet velocity, the longer time it will take for the molten salt outlet temperature to drop close to the solidification point. Without the protective device, the time taken to reach the freezing temperature of the molten salt at the outlet is about 20 seconds. The scheme of adding the protective device and reducing the inlet velocity of molten salt can be applied to extend the time by almost six times, or as much as 130 seconds. Thereby system security can be greatly improved.

Key words: absorber tube, molten salt, temperature drop characteristic, cloud occlusion

冯蕾, 肖刚, 郭磊, 杨承刚, 廖海燕. 云遮挡条件下熔融盐吸热管防护的数值模拟[J]. 中国电力, 2020, 53(11): 220-226.

FENG Lei, XIAO Gang, GUO Lei, YANG Chenggang, LIAO Haiyan. Numerical Simulations on the Protection of the Molten Salt Thermal Tube under Cloud Occlusion[J]. Electric Power, 2020, 53(11): 220-226.

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云遮挡条件下熔融盐吸热管防护的数值模拟

Numerical Simulations on the Protection of the Molten Salt Thermal Tube under Cloud Occlusion

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