熔盐 - 太阳能中心 - 接收器冷冻和恢复的评估ASSESSMENT OF MOLTEN-SALT SOLAR CENNTRAL-RECEIVER FREEZE-UP AND RECOVERY EVENTS.pdfVIP

ASSESSMENT OF MOLTEN-SALTSOLAR CaNTRAL-RECEIVER FREEZE-UPAND RECOVERY EVENTS James E. Pachecoand Sam R. Dunkin Sandia National Laboratories Albuquerque, NM 87185 ABSTRACT often. Only if this failure is not detected in time and corrective action Molten salt used as a heat transfer fluid in central-receiver solar (such as manually opening the valve) is not taken will the salt trapped power plants has a high freezing point (430°F (221°C)). It is very in the associated panels freeze. Since the volume of salt increases likely during the life of the plant that the receiver will accidentally when it goes from the solid to the liquid state (approximately 4.6%), freeze up due to equipment malfunction or operator error. damage can occur to the receiver tubing if the salt is thawed in a Experiments were conducted to measure the effects of a molten salt section of tubing or piping which is constrained at both ends. receiver freeze-up and recovery event and methods to thaw the Considering the multiple drain valves in the receiver, the likelihood receiver. In addition, simulated freezdthaw experiments were that a panel could fail to drain during nightly shut down is high over conducted to determine what happens when salt freezes and is thawed the life of the receiver. In addition, a panel could freeze up during in receiver tubes and to quantify the damage caused