快堆电厂旁路系统建模与仿真
2017-08-24祁琳王晓坤杨晓燕赵守智
祁琳++王晓坤++杨晓燕++赵守智
摘 要:该文以示范快堆电厂的旁路系统为研究对象,按汽轮机100%甩负荷、反应堆不停堆和安全阀不动作的要求,设计了100%MCR的汽轮机旁路系统,建立了旁路系统仿真模型,并且利用设计数据对仿真模型进行了验证。在各个快速甩负荷工况下,该模型的计算结果均与预期相符,该模型能够很好地反映旁路系统的工作过程。该模型作为快堆核电站全工况机理仿真模型的一个重要组成部分,为机组启、停和特殊变工况的模拟研究奠定了基础。
关键词:示范快堆 旁路系统 快速甩负荷 仿真
中图分类号:TM621 文献标识码:A 文章编号:1674-098X(2017)05(c)-0008-03
Modeling and Simulation of Bypass System in Fast Reactor Power Plant
Qi Lin Wang Xiaokun Yang Xiaoyan Zhao Shouzhi
(China Institute of Atomic Energy, Beijing, 102413, China)
Abstract: The research object of this paper is the bypass system of China Demonstration Fast Reactor. In this paper, 100% MCR steam turbine bypass system is designed according to the requirement of 100% cut back of the steam turbine, non-stop reactor and non-operation of the safety valve. A bypass system simulation model is established, and the simulation model was validated by design data. Under the conditions of fast cut back, the calculated results of this model are in line with the pre-judgment, so the model can reflect the working process of the bypass system very well. This model is an important part of the whole working condition mechanism simulation model of the fast reactor nuclear power plant, which lays the foundation for the simulation study of the unit start up, shutdown and special variable conditions.
Key Words: China Demonstration Fast Reactor; Bypass system;Fast Cut Back; Simulation
旁路系统作为汽轮机启停阶段工作的重要辅助装置,其工作性能的优劣直接关系到系统的安全运行,因此对旁路系统展开仿真建模,深入研究其工作特性有着重要的意义[1]。
在快堆电站中,反应堆对负荷的适应性跟不上汽轮机对负荷的适应性。当电网需要核电厂大幅度降负荷时,汽轮机能够很快关闭调节阀,降低输出功率,但是反应堆不能大幅降功率,蒸汽发生器的热功率也不会大幅度变化,因而在核岛和常规岛之间产生了一个功率差,蒸汽发生器二次侧加热的蒸汽流量大于汽轮机输入的蒸汽流量。汽轮机旁路系统的功能就是提供一个人工负荷[2],平衡核岛和常规岛之间的功率差,将多余蒸汽排向凝汽器、除氧器或大气,保证反应堆安全运行。
中国示范快堆是一台热功率为600 MW的快中子反应堆,由于其三回路汽轮机负荷变化的速率往往比二回路大,所以快堆電厂对旁路系统的要求比火电厂高,其旁路系统与常规火电厂的旁路设置有所不同。……
