摘要
针对多数发电机组的旁路系统无法投入全部保护功能,仅在机组起、停阶段作为锅炉和汽轮机的疏水阀问题,设计了一种新的旁路系统控制策略,将高压旁路系统划分为5种控制模式,实现了旁路系统从机组起动到并网,再到解列和锅炉停炉的全程自动控制。通过低压旁路系统前、后蒸汽焓降的计算,可精确预估低压旁路系统所需的减温水量,从而确保低压旁路系统排汽满足凝汽器的运行要求。将该控制策略应用于国华浙能发电有限公司二期超超临界1000MW机组,实现了机组不停炉快速甩负荷(FCB);在旁路系统考核试验结束后机组8min内重新并网,15min后机组负荷升至480MW。
Directing against the problems existing in many power plants,i.e.the bypass system of units is unable to bring its protective effects into full play,and only used as a drain valve of boiler and steam turbine in the stage of start-up or shutdown of units,a new bypass control strategy has been designed,which devides the HP-bypass into five control modes,the whole process automatic control of bypass system,from start-up of unit to connet the unit onto power grid,and returned again to sectionalization and shutdown of boiler,can be realized.Through calculation of steam＇s enthalpy drop before and after the LP-bypass system,the quantity of desuperheating water required by the LP-pass system can be precisely pre-estimated,thereby the exhaust steam from the LP-bypass system can be ensured to satisfy the requirement in operation of condenser.The above-mentioned control strategy has been applied onto an ultra-supercritical 1 000 MW unit in second-phase project of Ninghai Power Plant,the fast cut back （FCB） of unit without boiler shutdown being realized;after finishing assessment test of the bypass system,the unit is reconnected onto the power grid within 0 min,and the load of unit being increased to 480 MW after 15 min.
出处
《热力发电》
CAS
北大核心
2010年第9期81-84,88,共5页
Thermal Power Generation
关键词
发电机组
高压
低压
旁路系统
控制模式
减温水流量
power plant
HP
LP
bypass system
control mode
quantity of desuperheating water
