论文部分内容阅读
分析碟式太阳能接收器特点及运行条件,由聚焦后太阳能的特点决定了接收器工作温度范围700~850℃,焦平面处热流密度30~75 W/cm2。针对接收器目前存在受热面热流量和温度分布不均等问题,将高温热管引入接收器中。高温热管具有极高的传热性能和良好的等温性能,将其用于碟式太阳能接收器中可解决现行接收器受热不均、局部过热等问题。结合碟式太阳能接收器自身特点,从热管内部工质传输系数,工质热物理性能,不同工质高温热管的启动性能以及传热功率等角度分析用于接收器中高温热管常用碱金属工质锂、钠、钾、钠钾合金等。综合考虑以上因素,得出适用于碟式太阳能接收器高温热管工质为钠。
Analyzing the characteristics and operating conditions of the dish solar receiver, the operating temperature range of the receiver is 700-850 ° C and the heat flux density is 30-75 W / cm2 at the focal plane due to the characteristics of the focused solar energy. Aiming at the problem that the receiver has the heat flux and the temperature distribution in the heating surface, the high temperature heat pipe is introduced into the receiver. High-temperature heat pipe with high heat transfer properties and good isothermal properties, which will be used in dish solar receivers can solve the current receiver uneven heating, local overheating and other issues. Combined with the characteristics of the dish solar receiver, this paper analyzes the common alkali metal working fluid used in the high-temperature heat pipe of the receiver from the aspects of the transmission coefficient of the working fluid inside the heat pipe, the thermal physical properties of the working fluid, the starting performance of the high temperature heat-conducting pipe with different working fluids and the heat transfer power, Lithium, sodium, potassium, sodium and potassium alloy. Taking all the above factors into consideration, it is concluded that the high-temperature heat pipe refrigerant suitable for dish solar receivers is sodium.