Research on Primary Vacuum System Based on Ejector
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摘要: 为解决反应堆冷却剂系统主泵进行动排气或者联合排气时，因主系统压力快速下降，主泵的副瓦载荷瞬时剧增导致副瓦烧毁的问题，根据机组主系统充水排气操作流程，提出增设一套抽真空系统用于解决大小修后主系统低水位充水排气需求。通过仿真计算表明，该系统投用后70 min 内可将一回路绝对压力抽至0.015 MPa，在90 min内抽至0.01 MPa。核电厂在后续大修中进行了抽真空系统的推广试用，结果显示核岛主系统含气率一次合格，成功地消除启动主泵进行动排气或者联合排气时导致主泵副瓦烧毁的重大隐患，显著提升了主泵的运行可靠性，同时实现节约大修关键路径10 h以上。Abstract: In order to solve the problem that when the reactor coolant pump of the reactor coolant system discharges dynamically or jointly, the auxiliary thrust bearing of the reactor coolant pump burns out due to the rapid pressure drop of the main system and the instantaneous sharp increase of the auxiliary thrust bearing load of the reactor coolant pump, according to the operation process of water filling and discharge of the main system of the unit, an additional vacuum system is proposed to meet the low water filling and discharge requirements of the main system after overhaul. The simulation results show that the primary circuit pressure can be pumped to 0.015 MPa(a) within 70 minutes and 0.01 MPa(a) within 90 minutes after the vacuum system is put into operation. A nuclear power plant carried out the promotion and trial of the vacuum pumping system in the subsequent overhaul. The results showed that the gas content of the primary loop of the nuclear plant was qualified at one time, and the major hidden danger of burning the auxiliary thrust bearing of the reactor coolant pump after start-up was successfully avoided. The reliability of the reactor coolant pump was significantly improved, and at the same time, the critical path of overhaul was saved for more than 10 h.
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Key words:
- Reactor coolant pump /
- Vacuuming /
- Vacuum ejector
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表 1 半管运行时一回路的空气容积
Table 1. Air Volume of Primary Circuit During Half-Pipe Operation
部件 单个容
积/m3半管运
行时的气
体容积/m3数量/个 总空气
容积/m3冷段 2.59 0.66 3 7.77 热段 2.61 0.50 3 7.83 过渡段 3.98 0.51 3 11.94 稳压器 39.75 39.75 1 39.75 蒸汽发生器 30.76 30.76 3 92.28 反应堆压力容器 106.00 38.62 1 38.62 其他（包括波动管、主泵等） 8.24 8.24 1 8.24 
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表 2 真空喷射器入口管道压降计算结果
Table 2. Calculation Results of Pressure Drop of Ejector Inlet Pipe
DP/MPa Y d2/mm2 K T1/K qv/[ m3·(N·min)−1]) 0.0038 0.98 6400 7.5 310.78 8.20 0.004 0.98 6400 7.5 310.78 8.41
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表 3 不同过滤器的压降
Table 3. Pressure Drop for Different Filters
参数 参数值 高效过滤器 HEPA过滤器 设计风量/[ (N·m³)·min−1] 1250 3400 0.3472 0.9444 设计压降/ MPa 0.00017 0.000325 外形尺寸/ mm² 610×400 610×610 面积/m² 0.244 0.3721 设计流速/ (m·s−1) 1.423 2.5381 密度/( kg·m−³) 1.293 管道阻力 129.85 78.03 实际最大风量/[ (N·m³)·min−1] 28.2 实际最大流速/ (m·s−1) 1.9262 1.2631 实际最大压降/ MPa 0.000311 0.000080
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[1] 秦余新,向文元,董亚超,等. 压水堆核电厂一回路抽真空排气方法和装置研究[J]. 核动力工程,2014, 35(S1): 206-210. -
图(4) / 表(3)
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