摘要
固态电制热储热系统是一种新兴电力系统大容量调峰技术,研究电热元件与储热体间的传热匹配特性和热控制方法,对提升电储热系统的可靠性和强化传热具有重要意义。该文通过建立传热速率平衡方程,利用数值模拟的方法对电储热系统各设计参数与传热匹配的交互特性进行分析,并利用级贡献率、毕渥数和傅里叶数等传热匹配性能评价指标对传热匹配效果进行量化比较。结果表明,储热单元温度与加热功率线性正相关,与孔占比和循环风速指数型负相关,降低加热功率、提高孔占比和循环风速能改善储热体均热性,提高孔占比能,增加储热深度。经实验证明,通过多参数协同优化设计和前馈补偿控制,可以实现较好的传热匹配效果,为固态电制热储热系统的优化和热控制提供了方法。
The solid-state electric heating thermal storage system is an emerging large-capacity peak shaving technology in power system. Studying its heat transfer matching characteristic and heat control method is of great significance for improving reliability and heat transfer. In this paper, by establishing the heat transfer rate balance equation and using numerical simulation method, the correlation between the design parameters of heat storage system and heat transfer matching is analyzed. And through the heat transfer matching performance evaluation criteria such as the step contribution degree, the Biot number and the Fourier number, the heat transfer matching optimization design effect is quantified and compared. The results show that the temperature of the thermal storage unit increases linearly with the increase of electric heating power, decreases exponentially with the increase of hole ratio and circulating wind speed. Reducing the electric heating power, increasing the hole ratio and circulating wind speed can enhanced the soaking heat, and increasing the hole ratio can improve the thermal storage degree. The experimental verification proves that through the multi-parameter collaborative optimization and the feedforward compensation control, better heat transfer matching can be achieved.
作者
邢作霞
樊金鹏
陈雷
葛维春
齐凤升
Xing Zuoxia;Fan Jinpeng;Chen Lei;Ge Weichun;Qi Fengsheng(College of Electrical Engineering Shenyang University of Technology,Shenyang 110870,China;State Grid Liaoning Electric Power Co.Ltd,Shenyang 110004,China;School of Metallurgy Northeastern University,Shenyang 110819,China)
出处
《电工技术学报》
EI
CSCD
北大核心
2020年第11期2439-2447,共9页
Transactions of China Electrotechnical Society
基金
国家科技支撑计划(2015BAA01B00)
国家电网公司科技项目(2018YF-14)资助。
关键词
固态电制热储热
传热匹配
性能评价指标
热控制
Solid-state electric heating thermal storage
heat transfer matching
performance evalu ation criteria
heat control
