摘要
汽轮机绝对内效率可以表达为反映回热效果的动力系数与无回热循环效率的函数。研究并完善了动力系数的算法模型及其变工况响应特性,提出了汽轮机绝对内效率的简化模型。根据动力系数的概念提出与汽动给水泵相关动力系数的修正算法,完善了动力系数的算法模型;研究了典型外部约束条件(第一类因素)对动力系数的影响,建立了动力系数基准曲线;研究了运行参数(第二类因素)和设备效率(第三类因素)小幅度波动对动力系数的影响,建立了动力系数相对变化率的变工况响应曲线;提出了基于动力系数基准曲线(忽略第二、三类因素小扰动的影响)的汽轮机绝对内效率简化模型,该简化模型可以快速、直接反映三类因素对汽轮机绝对内效率的影响,误差分析表明该简化算法模型可以满足工程计算的精度要求。
The turbine absolute internal efficiency can be represented by power coefficient for regeneration effect and function for non-regeneration cycle efficiency. This paper analyzes and improves the calculation model and response characteristics of power coefficient under different loads, and presents the simplified model for turbine absolute internal efficiency. According to the concept of power coefficient, the improved algorithm and model are presented for power coefficient related with turbine driven feed-water pump. It also analyzes the impact of classic external constrains （the First Element） on power coefficient, and establishes the datum curve of power coefficient. Then the small perturbation impacts on power coefficient produced by operation parameter （the Second Element） and equipments efficiency （the Third Element） are analyzed, and the response curve of the power coefficient variation rate under different loads is formulated. The simplified turbine absolute inner efficiency model is built based on the power coefficient datum curve （the small perturbation impacts of Second and Third Elements are ignored） which can quickly and directly reflect the impacts of Three Elements on turbine absolute internal efficiency. The error analysis indicates that the accuracy of the simplified calculation model could meet the engineering requirement.
出处
《华东电力》
北大核心
2013年第10期2178-2182,共5页
East China Electric Power
关键词
回热
动力系数
变工况
汽轮机内效率
heat regenerative
power coefficient
operation under different loads
turbine absolute inner efficiency
