开式自然循环系统运行特性分析

Study on Operating Characteristics of Flashing Driving Natural Circulation System

提出开式自然循环冷却系统概念,编制相应的计算程序对该系统的启动、运行特性进行模拟计算,分析闪蒸现象对系统运行特性的影响。分析结果表明:在给定换热器外部换热系数及主流温度工况下,常压运行的开式自然循环系统启动快速,具有较强的自然循环能力;闪蒸现象是主导该开式自然循环系统运行的关键因素;在一定参数范围内,该系统对布置高差的影响不敏感。

We deal with a proposed natural circulation system under atmospheric pressure. The codes are developed by us for the purpose of analyzing the performance of the system. The startup, operating process are simulated through the codes. Furthermore, the influence of flashing on the system behaviors is studied. The results show that the system can build up natural circulation quite quickly from beginning during startup phase and can provide reliable natural circulation capacity for long time. It can also be concluded that the flashing of the water is dominant for the system in long run. The sensitive analysis also proves the height difference between heat sink and heat source plays a very little role on the performance of the system.