“华龙一号”核电WCW瞬态运行对凝汽器影响特性分析  

Analysis on the influence of WCW transient operation to condenser in the HPR1000

作　　者：吴鹏 李钊同 邢丹 张盼 WU Peng;LI Zhaotong;XING Dan;ZHANG Pan(Nuclear and Radiation Safety Center,MEE,Beijing 100082,China)

机构地区：[1]生态环境部核与辐射安全中心,北京100082

出　　处：《给水排水》2024年第9期92-98,共7页Water & Wastewater Engineering

摘　　要：“华龙一号”核电机组循环水系统(WCW)为凝汽器安全运行提供必须的冷却水,以“华龙一号”核电机组为研究对象,重点考虑循环水系统二次滤网堵塞及胶球清洗装置非正常运行,循环水泵跳闸等故障引起的循环水流量变化对凝汽器主要物性参数的影响。同时利用修正后的换热系数研究了凝汽器冷却管内结垢厚度对凝汽器主要物性参数的影响。利用分区多节点建模思想建立凝汽器模型,模拟了上述变化对凝汽器运行参数的影响,将仿真模型模拟的结果与“华龙一号”全范围验证模拟机平台运行结果进行了对比。仿真模型模拟结果与全范围验证模拟机平台运行结果大体一致,循环水泵跳泵或冷却管堵管都将导致凝汽器的总压力和冷却水出口温度迅速上升,冷却管结垢也将导致凝汽器换热能力下降,凝汽器的总压力升高,随着故障的严重程度或结垢加剧,凝汽器的总压力和各层冷却水出口温度的变化幅度更大。在机组发生一台循环水泵跳泵故障时,应迅速按规程要求降负荷;机组正常运行时,应保障胶球清洗装置安全高效运行,及时更换老化的胶球,并根据海洋生物季节繁殖特性,增加加药频次及二次滤网自动反冲洗的频率。The circulating water system of HPR1000 provides the necessary cooling water for the safety operation of the condenser.Research the influence of changes in circulating water flow caused by faults such as secondary filter blockage,abnormal operation of the rubber ball cleaning device,and tripping of the circulating water pump on the operation condenser in HPR1000.At the same time,the influence of scaling thickness in the condenser cooling tube on the condenser was studied.The multi-node condenser dynamic simulation model established by distributed thermodynamic modeling idea is used to simulate the influence of the above changes on the operating condenser,and the simulation results of the model are compared with the simulation results of the HPR1000 full-range simulator platform.The model simulation results are basically consistent with the simulation results of the full-range simulator platform,and the cooling water flow decrease caused by tripping of the circulating water pump or the cooling pipe blocking will lead to the total pressure of the condenser and the cooling water outlet temperature rise rapidly.The scaling of the cooling pipe will also lead to the decrease of the heat exchange capacity of the condenser,and then the total pressure of the condenser will increase.With the severity of the fault or the aggravation of scaling,the pressure of the condenser and the temperature of the cooling water outlet will change greater.When the circulating water pump trips,the load should be quickly reduced according to the requirements of the regulations.The safety and efficient operation of the rubber ball cleaning device should be guaranteed,and the aging rubber ball should be replaced in time.The frequency of dosing and the automatic back washing of the secondary filter should be increased according to the seasonal breeding characteristics of marine life.

关 键 词：华龙一号核电机组 循环水系统 凝汽器 循环水流量 结垢 WCW瞬态运行 仿真模型模拟 

分 类 号：TU992[建筑科学—市政工程]