基于事例推理技术的锅炉运行实时目标工况模型

Real-time Target Operating-condition Model for Boiler Operation Based on Instance-and-case Reasoning Techniques

为了提高电站运行经济性,提出采用机组综合成本煤耗作为锅炉运行的综合评价标准,同时对锅炉运行目标工况进行了定义。通过对锅炉原始运行工况数据库进行稳态判定过滤掉非稳态运行工况,在此基础上通过相似度计算将锅炉稳定运行工况划分到不同的工况组中,以机组综合成本煤耗作为衡量标准获得各工况组中的最优运行工况,建立锅炉运行目标工况数据库作为事例库,采用基于事例的推理技术检索锅炉当前实际工况对应的目标工况。实际应用表明该模型能够自动跟踪锅炉运行特性变化,目标工况的检索精度和效率满足运行优化的实时性要求,为电站锅炉的运行优化提供了一种重要的手段。

To enhance the operational cost-effectiveness of a power plant,the authors have proposed to adopt a plant synthetic cost-based coal consumption to serve as a comprehensive evaluation criterion for boiler operation.Meanwhile,a definition was given for the target operating-condition of a boiler.By making a steady-state judgement of the original operating condition database of a boiler non-steady-state operating conditions have been filtered out.On this basis through a similitude calculation,the steady-state operating conditions of the boiler can be classified into different groups of operating conditions to obtain the optimal ones in various operating condition groups by assuming the synthetic cost-based coal consumption of the boiler unit as a judgement criterion.With the establishment of a boiler-operation target operating condition database,which serves as a case-and-instance database,retrieved was the target operating condition corresponding to the current practical one by using the instance and case-based reasoning techniques.Practical applications show that the model can automatically track the changes in boiler operation characteristics.The accuracy and efficiency in retrieving the target operating condition can meet the real-time requirements for operation optimization,providing an important means for operation optimization of utility boilers.