锅炉部件和系统可靠性的计算模型

提出了电站锅炉部件及系统的可靠性计算模型,包括承压部件强度的可靠性计算模型、非承压部件的可靠性计算模型和锅炉系统的可靠性计算模型.锅炉承压部件的可靠性计算,考虑了设计量离散性的影响,使用概率设计法计算承压部件强度设计的可靠性.锅炉非承压部件的可靠性计算,使用了历史寿命数据统计法和非参数法的计算模型.锅炉系统的可靠性计算采用了串联系统的可靠性计算模型.给出了电站锅炉承压部件、锅炉易损件、锅炉耐用件、锅炉子系统、锅炉主机和锅炉系统的可靠性计算公式与计算实例.实现了在设计阶段定量计算锅炉部件和系统的可靠性.为电站锅炉的可靠性分析、可靠性设计与可靠性改进提供了依据.

Reliability Calculation Models for Boiler Systems and Components

Reliability calculation models of utility boiler systems and their components are being proposed,including models for calculating the strength reliability of pressurized parts,models for calculating the reliability of not pressurized parts and those for boiler systems.Considering the effect of design magnitudes' scatter on reliability calculations,the strength design of pressurized boiler parts can be performed by the probability design method.Reliability calculation of not-pressurized boiler parts may be performed with the help of the historic life data statistics method,together with models according to the non-parameter method.A series system reliability calculation model is used for calculating the reliability of boiler systems.Calculation formulae together with calculation examples of pressurized boiler parts,of easily failing as well durable components,of boilers' sub-systems,of the main boiler equipment as well as the whole boiler system,are given.Herewith,the reliability of boiler components and of the boiler system can be quantitatively already calculated during the design stage.A basis is thus provided for analyzing the reliability of utility boilers,for their reliability design and for improving their reliability.