摘要
为提高大型火电机组快速响应负荷的能力,文中提出引入邻炉蒸汽以实现机组快速启动的调峰方式。为验证此种调峰方式的可行性,本文以某电厂350 MW机组汽轮机转子为研究对象,通过数值模拟的方法研究了汽轮机启动过程中转子温度及热应力的变化,然后根据低周疲劳特性曲线得到不同监测点位置的寿命损耗率,最终确定出启动初参数及抽汽点位置。数值模拟计算结果表明,当蒸汽初压为10 MPa、初温为480℃时,既能满足电厂寿命损耗率低于0.024%的要求,又能在70 min内完成机组热态快速启动。
In order to enhancing the quick-response capacity of large-scale power unit load,a new peak shaving method by introducing neighboring boiler steam to complete quick start work is proposed in this paper. To verify the feasibility of this peak shaving,taking 350 MW steam turbine rotor as study object and using the method of numerical simulation to research temperature and thermal variation of steam turbine rotor during start-up process in the paper. Then,according to the low cycle fatigue characteristic curve,obtaining the life loss rate of different monitoring positions. Eventually determining the initial parameter and the position of exhaust point. According to the numerical simulation,when the initial pressure is 10 MPa and the initial temperature is 400 ℃,the calculation results not only can meet requirement of power plant life loss that is less than 0. 024%,but also can complete the hot start-up within 70 min.
出处
《节能技术》
CAS
2018年第1期73-78,共6页
Energy Conservation Technology
关键词
邻炉蒸汽
快速启动
热应力
寿命损耗
neighboring boiler
quick start-up
thermal stress
fatigue life consumption
