太陽能熱發(fā)電站中熔融鹽凍堵管道的熔化過程
發(fā)布時間：2018-11-22 11:46
【摘要】：熔融鹽工質(zhì)沸點高、低蒸汽壓及良好的傳熱儲熱特性使塔式電站是最具商業(yè)前景的太陽能熱發(fā)電技術(shù)之一.但是熔融鹽的凝固點高,導(dǎo)致采用熔融鹽作為吸熱傳熱工質(zhì)的太陽能熱發(fā)電站中有可能發(fā)生熔融鹽在管道內(nèi)凝固,使得凍堵管道的解凍成為一個棘手的問題.在利用電伴熱熔化管道內(nèi)熔融鹽的過程中,最關(guān)鍵的問題在于熔融鹽的固液相變,本文利用焓法模擬了水平管道內(nèi)熔融鹽的熔化過程,發(fā)現(xiàn)由于自然對流的存在使得先熔化的熔融鹽聚集到管道的上端.研究發(fā)現(xiàn),電伴熱的安裝位置影響熔化過程的不均勻性以及管內(nèi)熔融鹽完全熔化所需時間.電伴熱功率與完全熔化所需的時間呈非線性關(guān)系.隨著電伴熱功率的逐漸增大,縮短熔融鹽完全熔化所需時間的效果減弱.
[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.
【作者單位】： 中國科學(xué)院電工研究所中國科學(xué)院太陽能熱利用及光伏系統(tǒng)重點實驗室;中國科學(xué)院大學(xué);華北電力大學(xué)能源動力與機械工程學(xué)院;
【基金】：國家自然科學(xué)基金(51522602) 北京市自然科學(xué)基金(3164052)資助
【分類號】：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.
【作者單位】： 中國科學(xué)院電工研究所中國科學(xué)院太陽能熱利用及光伏系統(tǒng)重點實驗室;中國科學(xué)院大學(xué);華北電力大學(xué)能源動力與機械工程學(xué)院;
【基金】：國家自然科學(xué)基金(51522602) 北京市自然科學(xué)基金(3164052)資助
【分類號】：TM615
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8 К К.莫羅，
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