1 000 MW二次再热示范机组降压冲管研究

二次再热是超超临界燃煤发电机组研发的关键技术。根据国电泰州电厂1 000 MW二次再热示范机组特点,提出了采用过热器、一次再热器和二次再热器分别吹扫的2阶段分段降压冲管方法。针对该冲管方案进行了冲管系统工艺设计及主要参数选定,结合实际冲管中锅炉运行状态分析了冲管过程中各主要参数特性,并详细阐述该冲管方式下锅炉运行参数的合理控制及相关注意事项,为该类型锅炉降压冲管提供了很好的借鉴和指导作用。

Study on Depressurized Steam Blowing of Demonstrative 1 000-MW Unit with Double Reheat Cycles

Double reheating is the key technology developed for the ultra-supercritical coal-fired units. According to the characteristics of the demonstrative 1 000-MW unit with double reheat cycles, in this article, the two-stage depressurized steam blowing approach is proposed, which is to blow the primary and the secondary reheaters as well as the superheaters separately. The process design and the parameter selection are performed for this approach. With the boiler operating situation during blowing being taken into account, the characteristics of the parameters are analyzed with reasonable control methods and attentions over the parameters being presented in detail. The study may provide instructions for depressurized steam blowing in the boilers of the same type.