600MW等级亚临界机组超超临界改造的热力系统设计分析
|
摘要
以某660MW亚临界机组为研究模型,构建了600MW等级亚临界机组超超临界改造的两种方案所对应的热力系统。根据锅炉给水泵驱动方式不同,提出了常规方式驱动给水泵与主轴驱动给水泵两种方案。定量分析了两种方案下主蒸汽流量、低压缸排汽流量和汽轮机组热耗率等参数的区别。结果表明:亚临界机组通过提出的方案进行超超临界改造,可以使汽轮机热耗率下降约500k J/(k W·h),全厂毛效率提高近4%,主轴驱动给水泵的方案比常规方案热耗率降低约20k J/(k W·h)。部分负荷下,改造仍表现出良好的节能潜力,主轴驱动给水泵的改造方案热耗率仍低于常规方案。
Taking a 660 MW subcritical unit as a research model,build two thermal systems corresponding to two plans for parameter transformation of 600 MW level units from subcritical to ultra supercritical. Calculation and analysis have been made according to two different ways to drive boiler feed pump,which are the conventional way or the spindle driving way.The influence on main steam flow and heat absorption,turbine exhaust flow and heat consumption rate has been quantitative analyzed. Results show that,with the transformation this article put forward,steam turbine heat consumption rate could decrease about 500 k J/( k W·h); gross plant efficiency increases nearly 4%,in spindle driving feed water pump plan,the heat consumption rate is about 20 k J/( k W·h) lower than conventional plan. Under partial load,conclusion looks almost the same as the rated load.
Taking a 660 MW subcritical unit as a research model,build two thermal systems corresponding to two plans for parameter transformation of 600 MW level units from subcritical to ultra supercritical. Calculation and analysis have been made according to two different ways to drive boiler feed pump,which are the conventional way or the spindle driving way.The influence on main steam flow and heat absorption,turbine exhaust flow and heat consumption rate has been quantitative analyzed. Results show that,with the transformation this article put forward,steam turbine heat consumption rate could decrease about 500 k J/( k W·h); gross plant efficiency increases nearly 4%,in spindle driving feed water pump plan,the heat consumption rate is about 20 k J/( k W·h) lower than conventional plan. Under partial load,conclusion looks almost the same as the rated load.
引文
[1]国家发展与改革委员会,环境保护部,国家能源局.关于印发《煤电节能减排升级与改造行动计划(2014~2020年)》的通知(发改能源[2014]2093号)[Z].国家发展与改革委员会,2014.
[2]张晓鲁,杨仲明,王建录,等.超超临界燃煤发电技术[M].北京:中国电力出版社,2014.
[3]GB 21258-2007,常规燃煤发电机组单位产品能源消耗限额[S].
[4]吴毅强,舒君展.亚临界300MW机组改造为超超临界叠置循环的技术方案研究[J].中国电业(技术版),2011,(1):33-37.
[5]谢大幸,石永锋,郝建刚,等.600MW等级亚临界机组跨代升级改造技术应用研究[J].发电与空调,2015,36(6):23-26.
[6]叶涛.热力发电厂[M].北京:中国电力出版社,2004.
[7]赵永明.1350MW二次再热超超临界双轴机组热力系统设计研究[D].保定:华北电力大学,2014.
[8]肖增弘,王雷,夏永军,等.汽轮机课程设计[M].北京:中国电力出版社,2012.
[9]罗方,史宣平,唐清舟,等.直接空冷汽轮机主轴驱动给水泵方案探讨[J].东方汽轮机,2016,(2):14-16.
[10]丁建军.燃气-蒸汽联合循环电厂给水泵最佳驱动方式选择[J].广东电力,2014,27(1):9-12.
[2]张晓鲁,杨仲明,王建录,等.超超临界燃煤发电技术[M].北京:中国电力出版社,2014.
[3]GB 21258-2007,常规燃煤发电机组单位产品能源消耗限额[S].
[4]吴毅强,舒君展.亚临界300MW机组改造为超超临界叠置循环的技术方案研究[J].中国电业(技术版),2011,(1):33-37.
[5]谢大幸,石永锋,郝建刚,等.600MW等级亚临界机组跨代升级改造技术应用研究[J].发电与空调,2015,36(6):23-26.
[6]叶涛.热力发电厂[M].北京:中国电力出版社,2004.
[7]赵永明.1350MW二次再热超超临界双轴机组热力系统设计研究[D].保定:华北电力大学,2014.
[8]肖增弘,王雷,夏永军,等.汽轮机课程设计[M].北京:中国电力出版社,2012.
[9]罗方,史宣平,唐清舟,等.直接空冷汽轮机主轴驱动给水泵方案探讨[J].东方汽轮机,2016,(2):14-16.
[10]丁建军.燃气-蒸汽联合循环电厂给水泵最佳驱动方式选择[J].广东电力,2014,27(1):9-12.