【作者】 黄述真；

【导师】 胡三高；

【作者基本信息】 华北电力大学 ， 热能工程， 2001， 硕士

【摘要】 大型汽轮机组调峰运行的分析与优化系统是对汽轮机组调峰过程的安全性和经济性进行分析和综合优化的重要基础。 本文建立了安全性分析、经济性分析和优化分析三部分的数学模型。安全性分析的数学模型以汽轮机转子在汽温非线性变化条件下的温度和热应力解析计算方法为基础，包括对调峰过程中转子的温度、热应力分布状况以及疲劳寿命损耗的分析。优化模型的建立利用最优化理论，以综合评价指标，既转子的疲劳寿命损耗折合成的标准煤与调峰过程的直接燃料损失之和为优化目标进行寻优。 在建立综合分析数学模型的基础上，本文开发了对大型汽轮机组调峰运行分析和优化的软件。该软件采用可视化开发工具Delphi编制，具有易用性、开放性和通用性。 论文的最后利用软件以国产20万机组为实例进行了分析，所计算的例子对同类型机组的调峰运行具有参考价值。更多还原

【Abstract】 Analysis and optimization on peak load operation mode for large capacity steam turbine unit are very important to ensure safety, reliability and economics of steam turbine unit during its startup and shutdown. In general, elevated temperature turbine equipment, such as, the high- pressure steam turbine rotor, is subject to a critical steam condition. Its fatigue life expenditure during startup will directly influence the safety and reliability of steam turbine unit. Furthermore, the large life expenditure of a component also increase maintenance cost and outfit cost in full-life of steam turbine unit. In this paper the mathematical model including three parts, safety analysis, economics analysis and optimization, has been established. Based on simplified calculation method of the temperature fields and thermal stress fields under nonlinear change of steam temperature for high-pressure steam turbine, a quantitative cost analysis model considering fatigue life expenditure of steam turbine rotor and consumed fuel during startup is presented. An objective function, orientated with rotor life expenditure cost and direct fuel loss cost, is analyzed and optimized. On the basis of aforementioned mathematical model an analysis and optimization software package for large capacity, which is implemented by means of object-orientated code Delphi steam turbine unit is developed in this paper. In order to verify the software a series of analysis and comparison for 200MW steam turbine units made in China are carried out. A good coincidence between analysis conclusion and practical situation can be observed.更多还原