移動擋板對熔鹽蓄熱特性的模擬研究

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中圖分類號：TK513.5 文獻(xiàn)標(biāo)志碼：A

Simulation study on heat storage characteristics of molten salt by moving baffle

AO Xuelian， ZHU Zhiwei， ZHOU Ruirui （SchoolofEnergyandPower Engineering， UniversityofShanghai forScienceandTechnology，Shanghai 2Oo093，China）

Abstract： In order to optimize the heat storage performance of the single-tank molten salt heat storage system， the influence law of setting moving baffles in the storage tank on the heat storage process was discussed. The influence of the moving bafle on the heat transfer of molten salt flow in the tank was studied by numerical simulation method. The dynamic movement of the bafle was simulated based on the dynamic grid and grid adaptive technology. The heat storage processes before and after the settig of the baffle were compared， and the influence of the moving baffle on the heat transfer of the heat storage fluid flow was analyzed. On this basis， the influence of the moving speed and size of the moving baffle on the heat storage performance of the system was further discussed. The results show that the moving baffle can promote the flow heat transfer of molten salt and enhance the heat storage capacity of the tank compared with the case without baffle. The size of the baffle has a litle effect on the heat storage process， while the moving speed of the baffle has a significant effect on it. Within the range of parameters studied， the thermal storage time of the system can be reduced by up to 17.65% with the addition of the baffle， and the thermal storage efficiency can be increased by up to 11.65% . Further results found that the heat transfer of molten salt can be promoted when the moving bafle is always above the thermocline， while it is weakened when it is below the thermocline. Therefore， setting up moving bales in the storage tank is an effective way to improve the performance ofthe molten salt heat storage system. The speed of the baffles and their positional relationship with the thermocline are the key factors affecting the heat storage efficiency.

Keywords： heat storage of molten salt; dynamic grid; moving baffles; thermal performance

儲能技術(shù)是解決可再生能源間歇性和不穩(wěn)定性問題的關(guān)鍵技術(shù)之一，有助于實現(xiàn)能源供需平衡，提高能源利用效率[1-5]。（剩余12456字）