引入邻炉蒸汽调峰机组参数匹配的研究
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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.
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.
引文
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[6]王鹏,陈云川,秦增虎,等.200 MW机组调峰运行时最优初压的试验研究[J].节能技术,2017,35(1):57-59,65.
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[9]周丹,麻宏强.LNG板翅式换热器板翅结构热应力分布规律分析[J].节能技术,2014,32(04):291-294,304.
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[12]袁鹏飞,盛德仁,陈坚红.汽轮机转子热疲劳寿命损耗监测面的有限元分析[J].电站系统工程,2004,20(2):43-48.
[13]贺斌.基于有限差分法的汽轮机转子低周疲劳寿命损耗监测系统研究[D].长沙:长沙理工大学,2013.
[14]陈鹏.大型汽轮机启停过程优化和寿命管理研究[D].北京:华北电力大学,2009.
[15]张大霁,王礼海,管伟诗,等.300 MW、600 MW火电汽轮机的寿命管理[J].汽轮机技术,2001,43(6):375-376.
[2]李维特,黄保海,毕仲波.热应力理论分析及应用[M].北京:中国电力出版社,2004.
[3]林学忠,葛政法,吴元柱.核电机组供热安全性分析[J].节能技术,2017,35(04):355-357,366.
[4]江宁,曹祖庆.温态、热态启动中的最佳温度匹配方式探讨[J].中国电机工程学报,1999(9):58-62.
[5]张淳,王富强,谭建宇,等.汇聚太阳能流体流速对吸热器温度场和应力场影响[J].节能技术,2015,33(2):103-107,112.
[6]王鹏,陈云川,秦增虎,等.200 MW机组调峰运行时最优初压的试验研究[J].节能技术,2017,35(1):57-59,65.
[7]王金明.背压汽轮机的背压起动方式探讨[J].节能技术,1996(1):11-13.
[8]李勇,杨磊磊.汽轮机变工况各级热力参数计算方法研究[J].汽轮机技术,2015,57(5):321-325,340.
[9]周丹,麻宏强.LNG板翅式换热器板翅结构热应力分布规律分析[J].节能技术,2014,32(04):291-294,304.
[10]陈江龙.基于有限元的汽轮机转子低周疲劳寿命预测与在线系统可靠性研究[D].杭州:浙江大学,2005.
[11]袁利军.300 MW机组中压缸启动热应力计算与启动优化[D].保定:华北电力大学,2006.
[12]袁鹏飞,盛德仁,陈坚红.汽轮机转子热疲劳寿命损耗监测面的有限元分析[J].电站系统工程,2004,20(2):43-48.
[13]贺斌.基于有限差分法的汽轮机转子低周疲劳寿命损耗监测系统研究[D].长沙:长沙理工大学,2013.
[14]陈鹏.大型汽轮机启停过程优化和寿命管理研究[D].北京:华北电力大学,2009.
[15]张大霁,王礼海,管伟诗,等.300 MW、600 MW火电汽轮机的寿命管理[J].汽轮机技术,2001,43(6):375-376.