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1、xxx 毕业设计（论文）1摘要本课题是对某 25MW 凝汽式汽轮机组进行热力设计。进行这次主要时为了提高电厂的经济性，以求达到“ 节能降耗，环境保护 ”的目的。在提高其经济性的同时还要保证该机组的实用性和安全可靠性。因此在设计之前，要先查找一些资料，然后对汽轮机的蒸汽系统，汽轮机级的热力等进行计算，如除氧器的抽汽量，凝结水量，汽轮机装置的热经济性，级热力参数的选择，各能量损失计算等；同时对其通道部分进行选型以及对其级数进行确定。整个设计完成后，证实了我们的设计在拥有适用性和安全可靠性的前提下确实能够提高发电厂的经济性，达到“节能降耗，保护环境” 的目的本设计的主要内容包括：汽轮机的工作原理、多
2、级汽轮机的工作过程、汽轮机的变工况下的工作特性、汽轮机的结构及叶片强度。根据通流部分形状和回热抽汽点的要求，确定压力级既非调节级的级数和排汽口数，并进行各级比焓降分配；对各级进行详细的热力计算，求出各级通流部分的几何尺寸，相对内效率，实际热力过程曲线。根据各级热力计算结果，修正各回热抽汽点压力以符合实际热力过程曲线的要求，并修正回热系统的热力平衡计算；分析与确定汽轮机热力设计的基本参数，这些汽轮机热力设计的任务是，按给定的设计条件，确定通流部分的几何尺寸，参数包括汽轮机的容量，进汽参数，转速，排汽压力冷却水温度，给水温度，供热蒸汽压力等；分析并选择汽轮机的型式，配汽机构形式，通流部分形状及有关
3、参数；对汽轮机的原则性热力系统进行汽耗量及热经济性的初步计算；根据汽轮机运行特性，经济要求及结构强度等因素，比较和确定调节级的型式，比焓降，叶型及尺寸等。关键字：汽轮机；热力计算；热力系统 xxx 毕业设计（论文）2AbstractSubject is on a 25MW of condensing steam turbine unit for thermal design. For the main power in order to improve the efficiency of when, in order to achieve energy saving, environmenta
4、l protection. To improve the efficiency in the unit also guarantee the practicability and reliability. Therefore in the design prior to find some information, and then to the steam turbine, steam heating system of such calculations, such as the deaerators steam condensation water, steam, heat effici
5、ency, the level of the device, the choice of thermodynamic parameters calculated energy loss, etc. Part of the passage of the selection and determine. After the completion of the entire design, the design that we have safety reliability and applicability in the premise can improve the efficiency of
6、power plants indeed, energy saving, environmental protection.The design of the main contents include: the working principle, the multistage turbine steam turbine, the working process of the work characteristics change under the condition of the steam turbine blade, structure and strength. According
7、to the shape of the steam heat and pressure, determine the point of grade is neither adjust series and exhaust steam mouth, and various than enthalpy drop distribution, At all levels of thermodynamic calculation, the levels of geometric dimension within the relative efficiency, practical, thermodyna
8、mic processes curve. According to the calculation results, the fixed at each heat regenerator pressure steam point to accord with the actual requirement of thermal process curve, and the thermal balance heat system calculation, Analysis and determination of the basic parameters method.examples desig
9、n, the design of the task method.examples are given, and the design of the flow condition, to determine the dimensions of the steam turbine, the parameters including capacity, inlet steam parameters, speed, temperature and water vapor pressure water temperature, heating steam pressure, etc. Analyze
10、and select the steam turbine type, form, some shapes and related parameters, The principle of turbine steam heating system and the thermal efficiency of the preliminary calculation, According to the turbine operation characteristics and structural strength and economic factors, and determine the typ
11、e, level adjustment than enthalpy drop, leaf type and size, etc.xxx 毕业设计（论文）3Key words: turbine; thermodynamic calculation; thermodynamic system目录摘要 .1Abstract.21.文献综述 .52 概述 .82.1 设计任务 .82.2 热力设计的内容及要求 .82.3 国产汽轮机基本参数的选择与系列 .93 汽轮机总进汽量的初步估算 .123.1 回热抽汽压力的确定 .123.2 计算 .134 通流部分的选型 .214.1 排汽口数与末级叶片 .214.2 配汽方式和调节级的选型 .214.3 压力级设计特点 .255 压力级比焓降分配及级数的确定 .
