基于潜在通路分析的船用凝水泵汽蚀原因研究

针对某型船用凝水泵切换启动时常因汽蚀难以建立出口压力的问题,采用潜在通路分析技术确定凝水泵发生汽蚀的原因。首先基于热力系统质量流动伴随能量转移的特点,完善了热力系统潜在通路分析步骤,设计了离心泵扬程较低时工质逆流的等效转化方法；将该型船用凝水系统转化为电路图,采用人工搜寻方式查找凝水系统网络中导致凝水泵发生汽蚀的潜在隐患。结果表明,在机组切换启动过程中,来自本台机组和相邻机组的高温级间漏水路径为造成凝水泵汽蚀的潜在通路。研究结果可为凝水系统设计和优化提供参考。

Marine condensate pump cavitation causes research based onSneak Circuit Analysis

Due to the fact that a certain type of marine condensate pump failed to establish outlet pressure frequently as a result of cavitation during switch starting process, the Sneak Circuit Analysis Technique is opted to determine the cavitation causes. The Sneak Circuit Analysis Technique in thermodynamic system is improved based on the thermodynamic characteristics of mass flow along with energy transfer, and equivalent transformation method of centrifugal pump is designed when refrigerant flows reversely because of low lift. The marine condensate system is transformed into circuit diagram, and artificial search method is used to define the potential risks leading to cavitation of the condensate pump. The result shows that during staring process, the paths from own unit and adjacent unit with high temperature interstage leakage water are the sneak circuits resulting in the cavitation. The analysis results can provide preference for design and optimization of the condensate system.