太阳能热发电站中熔融盐冻堵管道的熔化过程
发布时间：2018-11-22 11:46
【摘要】：熔融盐工质沸点高、低蒸汽压及良好的传热储热特性使塔式电站是最具商业前景的太阳能热发电技术之一.但是熔融盐的凝固点高,导致采用熔融盐作为吸热传热工质的太阳能热发电站中有可能发生熔融盐在管道内凝固,使得冻堵管道的解冻成为一个棘手的问题.在利用电伴热熔化管道内熔融盐的过程中,最关键的问题在于熔融盐的固液相变,本文利用焓法模拟了水平管道内熔融盐的熔化过程,发现由于自然对流的存在使得先熔化的熔融盐聚集到管道的上端.研究发现,电伴热的安装位置影响熔化过程的不均匀性以及管内熔融盐完全熔化所需时间.电伴热功率与完全熔化所需的时间呈非线性关系.随着电伴热功率的逐渐增大,缩短熔融盐完全熔化所需时间的效果减弱.
[Abstract]:The high boiling point, low vapor pressure and good heat transfer and storage characteristics of molten salt make tower power station one of the most promising solar thermal power generation technologies. However, the high solidification point of molten salt leads to the possibility of solidification of molten salt in the pipeline by using molten salt as the working medium for endothermic heat transfer, which makes the thawing of frozen and blocked pipeline a thorny problem. In the process of melting the molten salt in the tube by electric tracing, the most important problem lies in the solid-liquid phase transition of the molten salt. In this paper, the melting process of the molten salt in the horizontal pipe is simulated by the enthalpy method. It is found that due to the existence of natural convection, the molten salt first melts to the upper end of the pipeline. It is found that the installation position of electric tracing heat affects the inhomogeneity of melting process and the time required for the complete melting of molten salt in the tube. There is a nonlinear relationship between the power of electric heating and the time required for complete melting. With the increasing of electric tracing power, the effect of shortening the time required for the complete melting of molten salt is weakened.
【作者单位】： 中国科学院电工研究所中国科学院太阳能热利用及光伏系统重点实验室;中国科学院大学;华北电力大学能源动力与机械工程学院;
【基金】：国家自然科学基金(51522602) 北京市自然科学基金(3164052)资助
【分类号】：TM615
[Abstract]:The high boiling point, low vapor pressure and good heat transfer and storage characteristics of molten salt make tower power station one of the most promising solar thermal power generation technologies. However, the high solidification point of molten salt leads to the possibility of solidification of molten salt in the pipeline by using molten salt as the working medium for endothermic heat transfer, which makes the thawing of frozen and blocked pipeline a thorny problem. In the process of melting the molten salt in the tube by electric tracing, the most important problem lies in the solid-liquid phase transition of the molten salt. In this paper, the melting process of the molten salt in the horizontal pipe is simulated by the enthalpy method. It is found that due to the existence of natural convection, the molten salt first melts to the upper end of the pipeline. It is found that the installation position of electric tracing heat affects the inhomogeneity of melting process and the time required for the complete melting of molten salt in the tube. There is a nonlinear relationship between the power of electric heating and the time required for complete melting. With the increasing of electric tracing power, the effect of shortening the time required for the complete melting of molten salt is weakened.
【作者单位】： 中国科学院电工研究所中国科学院太阳能热利用及光伏系统重点实验室;中国科学院大学;华北电力大学能源动力与机械工程学院;
【基金】：国家自然科学基金(51522602) 北京市自然科学基金(3164052)资助
【分类号】：TM615
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8 К К.莫罗，
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