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非能动余热排出系统是200MW低温供热堆重要的安全保障系统,其启动方式对整个系统运行过程和效率产生重要影响。通过建立合适数学物理模型,编制计算机程序仿真模拟零流量和微流量两种启动,选择高精度Gear算法,研究启动方式对整个系统运行过程影响,掌握其稳态和瞬态工况下的热工水力特性,就瞬态变化过程做出比较分析。微流量启动使余热排出系统参数波动变大,达到稳定过程的时间变长。冬季选择微流量,保持管内流动,可以防冻;夏天选择零流量,可以提高系统敏感性和响应速度。根据不同环境,选择适当启动方式。仿真对系统实际的设计和操作都有重要意义。
Passive residual heat removal system is an important safety guarantee system of 200MW low temperature heating reactor, and its start-up mode has a significant impact on the whole system operation process and efficiency. Through the establishment of a suitable mathematical physics model, the computer program was simulated to simulate two kinds of start-up of zero flow and micro flow. The high-precision Gear algorithm was chosen to study the influence of start-up mode on the whole system operation and to master the thermal work under steady-state and transient conditions Hydraulic characteristics of the transient changes in the process to make a comparative analysis. Micro-flow start to exhaust heat system parameters become more volatile, to stabilize the process of longer time. Select the micro-flow in winter to keep the tube flow, you can frost-resistant; the summer choose zero flow, can improve system sensitivity and response speed. Depending on the environment, choose the appropriate way to start. Simulation of the actual system design and operation are of great significance.