热能与动力工程 火电机组不可控参数变化对热经济性分析的影响.docVIP

电力学院 毕业论文 火电机组不可控参数变化对热经济性分析的影响 办学单位：华南理工大学电力学院 班 级： 热能与动力工程 学 生： （10座机电话号码0601052） 指导教师： 教授 提交日期： 2010 年 10 月 14 日 摘要 本文以热力学第一定律为基础，根据火电机组热经济性分析的统一物理模型和数学模型，建立了火电机组辅助汽水流量、加热器上、下端差和抽汽压损的耗差分析模型；并通过分析凝汽器端差变化对机组其它运行参数的影响，建立了凝汽器端差的耗差分析模型；最后以火电机组热经济性分析统一物理模型中的小汽轮机为研究对象，初步建立了汽轮机汽缸效率的耗差分析模型。通过实例计算，验证了上述各模型的正确性。为火电机组的热经济性分析提供了新方法，为工程界解决实际问题提供了新途径。 关键词：火电机组，统一物理模型，统一数学模型，不可控参数， 耗差分析 ABSTRACT on the basis of first thermodynamic law，the energy-loss analysis models including auxila -ry，steam-water fluxheater terminal temperature difference upside，heater terminal temperature difference underside and extraction steam pressure loss for coal—fired power units were established according to the unified physical model and the mathematic model of heat-economic analysis for the coal-fired power unit．And the energy-loss analysis model of condenser terminal temperature difference was established in this paper by analyzing the influences which the condenser ter -minal temperature difference changing had on other operating parameters of the unit．Finally by taking the small steam turbines in unified physical model of heat—economic analysis for the coal —fired power unit as the research object the energy-loss analysis model of the effect of cylinder on steam turbines was established preliminarily． The models mentioned above in this paper were proved to be correct by the checking calculations．The models not only supply a new method to the analysis for the coal—fired power unit，but also provide a new method for engineering circles to solve practical problems．KEY WORDS：coal-fired power unituni6ed physical model，uni6ed mathematic model，uncontrolled Parameters，energy—loss analysis 1.1课题研究的背景…………………………………………………………………………………3 1.2 课题研究的现状……………………………………………………………………………………4 1.3 研究内容与目的……………………………………………………………………………………6 第二章火电机组热经济性分析统一模型及经济指标计算……………………………………………………6 2.1火电机组热经济性分析的统一物理模型………………………………………………………………6 2.2火电机组热经济性分析的统一数学模型…………………………………………………………10 2.3火电机组发电标准煤耗率的计算……………………………