EXPERIMENTAL STUDY ON START-UP AND OPERATION CHARACTERISTICS OF SEPARATE HEAT PIPE SYSTEM UNDER LOW PARAMETERS

抄録

The main function of the passive residual heat removal system of swimming pool-type low-temperature heating reactor (SPLTHR) is to discharge the residual heat generated by the core in a passive way after the shutdown and the failure of the cooling system of the pool water, so as to stabilize the temperature of the pool water below a certain temperature to achieve Long-term cooling of the core. Due to its passive characteristics, small heat transfer temperature difference, and long heat transfer distance, the separated heat pipe can efficiently discharge the residual heat of SPLTHR. At present, many scholars at home and abroad have carried out extensive research on passive separation heat pipe of spent fuel pool and containment vessel, but there are few experimental studies related to separation heat pipe applied to SPLTHR. In this research, a thermal-hydraulic test rig was set up to simulate the reactor pool and the separated heat pipe system. By changing initial vacuum degree of the system, the heat exchange rate under different working conditions was obtained. The influence of initial vacuum degree on system start-up and heat transfer is analyzed. The results show that the initial vacuum degree of the system will have a great influence on the heat transfer effect of the system due to non-condensable gas in the loop, and will also affect the start-up time and the temperature of the pool water at the start-up. When the initial vacuum degree is high, the flow rate will fluctuate after the system starts.