【作者】 王尧明；

【导师】 谢诞梅；

【作者基本信息】 武汉大学 ， 动力工程， 2004， 硕士

【摘要】 根据我国目前的能源结构，大容量火电机组参与调峰将是今后长期的任务，对两班制运行的调峰机组，加快启停速度是电网调峰的客观需要，也是减少启停热损失、提高运行经济性的合理要求；而加快机组启停速度势必增大设备的寿命损耗，成为两班制调峰运行的不安全因素。为此我们可以通过两方面的努力达到电网调峰对汽轮机启停的要求：第一是对设备作较大的改进，使其在结构上具备适应快速、频繁启停的机动能力；第二是选择合理的启停方式，通过改进操作程序，在加快启停速度的同时，控制各项指标在安全范围之内，实现优化启停。 本文从现场汽轮机转子寿命管理的实际需要出发，通过对汽轮机优化启停的评价、启停过程中最佳温升率的选择、国产300MW汽轮机转子寿命管理系统的等若干问题的研究，从热应力的角度阐述了对国产300MW汽轮机进行启停优化的可能性以及加强现场寿命管理的手段。具体进行了如下内容的研究： 1．论文首先分析了国内外汽轮机转子寿命研究的背景。在此基础上，研究了目前汽轮机转子的寿命研究中存在的问题(包括低周疲劳和高周疲劳的迭加问题、高温蠕变和低周疲劳的交互作用和低周疲劳的可靠性分析与设计)。同时，分析了转子寿命管理的发展方向，以此说明该选题的重要性。 2．通过分析转子温度场的计算、应力计算、转子寿命和转子剩余寿命估算方法，论文从转子寿命计算和启停最优化准则两个方面研究了汽轮机转子的寿命管理。 3．针对某机组冷态启动、初始温度300℃时的热态启动两种情况的11种工况，论文对启停过程中的最佳温升率进行了研究，并分析了温升率对启停时间、应力裕度、寿命损耗率的影响，分析了温升率对应力值和寿命损耗率的影响规律。 4．论文分析了阳逻电厂优化引进型300MW机组结构(特别是转子结构和高中压缸轴端汽封结构)。根据该电厂#2机组的启动曲线、转子结构和变工况参数，计算了300MW汽轮机高压转子前轴封段应力，研究了300MW汽轮机转子寿命分配与管理。然后分析了AGC变负荷对高压转子安全性的影响。最后提出了减少汽轮机转子寿命损耗的措施。更多还原

【Abstract】 According to the recent energy structure of our country, it’s long-term task that large capacity thermal power units have to be used in peak regulation. To two-shift operation units, accelerating the speed of startup or shutdown is the objective demand of electric network peak regulation and the reasonable requirement of decreasing thermal loss when startup or shutdown, increase operation economical efficiency, but it can also increase the unit’s life loss and become the dangerous factor of two-shift operation units. Therefore we can improve the peak regulation through two methods: the first is improving the equipment mostly in order to adapt the acceleration and startup or shutdown frequently; the second is choosing reasonable startup or shutdown style, control every target in safe range at the same time of acceleration through improving operational procedure.This paper studied the appraisement of steam turbine optimized startup or shutdown, the choice of optimal temperature rising rate and the research of life management system of 300MW steam turbine rotor based on the actual requirement of in site rotor life management, it also illustrated the possibility of optimizing to startup or shutdown and the methods of strengthen local life management. Mainly:1. This paper analyzed the background of rotor life research, and studied the problem in life management recently (including nestification of low-cycle and high-cycle fatigue loss, interaction of high temperature creep and low-cycle fatigue, reliability analysis and design of low-cycle fatigue), and analyzed the develop direction of life management in order to illustrate the importance of this topic.2. This paper studied the life management from rotor life calculation and optimum criterion by analyzing the calculation of rotor temperature field, stress, rotor life and rest life.3. Aimed at the cold start and the hot start with initial temperature 300 C in 11 operation modes, this paper studied the optimal temperature rising rate and calculate respectively, and analyzed the temperature rising rate impact on the startup or shutdown time, the stress margin and the life loss rate. It also analyzed the impact of the temperature rising rate on the stress value and life loss rate.4. This paper analyzed the structure (especially the rotors and the gland sealing system) of a 300MW unit in YangLuo power plant. Based on the #2 unit startup curve in this plant, the construction of the rotors and the parameters off-design condition, this paper calculated the stress of the gland sealing part of the high pressure rotor, studied the life distribution and management, and analyzed AGC varying duty impact to rotor safety. At last, this paper illustrated the measures of increasing rotor life loss.更多还原