超超临界二次再热机组不同调频方式特性比较研究  

Comparison of Ultra-supercritical Double Reheating Units under Different Frequency Modulations

作　　者：荆雨田 段立强[1] 田李果 JING Yutian;DUAN Liqiang;TIAN Liguo(School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《华北电力大学学报（自然科学版）》2021年第2期104-113,共10页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家重点研发计划项目(2017YFB0602101)。

摘　　要：为保证电网安全平稳运行、平抑新能源对电网带来的冲击,火电机组需适应新环境,提高自身的调频灵活性。使用Ebsilon仿真软件对某660 MW超超临界二次再热机组进行建模。基于此模型分别研究高加旁路调频、补气阀调节、凝结水节流调频等不同方式调频特性,获得每种调频方式对于机组负荷及热经济性方面的影响规律。并比较了三种调频方式各自的优劣点并进行排名,最后给出机组不同调频方式的使用建议,结果表明:机组负荷需求较高时采用高加大旁路;对于经济性要求较高时采用凝结水节流调频;对两者均有考虑时可选择1/2混合旁路或高加大旁路,在响应初期可打开补气阀做出最快反应。To guarantee the stable operation and to smooth the new-energy-caused impact on power grid,coal-fired power generation units need to adapt to the new environment and improve their frequency modulation flexibility.In this paper,we use Ebsilon simulation software to model a 660 MW ultra-supercritical double reheating unit.Based on this model,the frequency modulation characteristics of different frequency modulation modes,such as high pressure feeding water heater bypass frequency modulation,overload control valve adjustment and condensate throttle frequency modulation,are studied respectively to obtain their effects on the unit load and thermal performance.Their advantages and disadvantages of these three kinds of frequency modulation methods are compared and ranked respectively.Finally,some valuable suggestions for the use of the frequency modulation methods are given.The results show that:it is better to use the whole high pressure feeding water heater bypass frequency modulation when the load demand for the unit is higher,to use the condensate throttling frequency modulation when the economic performance requirement is higher,and use 1/2 mixed high pressure feeding water heater bypass or the whole bypass when both the load demand and the economic performance demand are considered.At the initial stage of response,it is suggested to open the overload control valve to realize the fastest response.

关 键 词：二次再热 高加旁路调频 补气阀调节 凝结水节流调频 

分 类 号：TK37[动力工程及工程热物理—热能工程]