摘要
基于RCM定性分析和维修性分析,确定了电站凝汽器合理的维修方式。通过维修方式决策,选取了成批更换模型,建立了凝汽器铜管视情更换的定量分析模型,研究了凝汽器铜管视情更换状态参数的选择原则。以200 MW机组N-11220-4型凝汽器为研究对象进行了实例研究,对现行维修规程提出了相应的修改建议。研究结果表明,当水质偏离设计工况不严重时,可以选取累积堵管率作为视情更换的状态参数,决策阈值为1.28%;当水质偏离设计工况严重时,可以选取累积堵管次数和当年故障率作为状态参数,决策阈值为累积故障次数达到20.4,并且当年故障率达到3.95次/年;与现行维修方式相比,优化后的维修方式能降低运行与维修成本34%。
On the basis of RCM qualitative and maintainability analysis a rational maintenance mode is determined for power plant condensers.Through the decision-making of maintenance modes a batch replacement model has been chosen and a model for quantitative analysis of on-condition replacement of copper tubes in power plant condensers established.A study was conducted of the principles for choosing status parameters for the on-condition replacement of copper tubes in condensers.With the N-11220-4 type condenser of a 200 MW unit serving as an object of study a case study has been performed.Relevant proposals for revising maintenance regulations currently in force are put forward.The research results show that when the water quality does not seriously deviate from the design regime,the accumulative tube-plugging rate can be chosen as the status parameter for the on-condition replacement with the decision-making threshold value being set at 1.28%.When the water quality deviates seriously from the design regime,the frequency of accumulative tube-plugging and the failure rate of the current year can be chosen as the status parameter with the decision-making threshold value being the accumulative failure frequency amounting to 20.4 times and the failure rate of the current year being set at 3.95 times/year.Compared with the currently prevailing maintenance modes,the optimized maintenance modes can reduce the operation and maintenance costs by 34%.
出处
《热能动力工程》
EI
CAS
CSCD
北大核心
2006年第3期287-290,共4页
Journal of Engineering for Thermal Energy and Power
关键词
电站凝汽器
RCM分析
维修决策
视情更换
power plant condensers,RCM analysis,maintenance decision-making,replacement based on specific conditions
