1000 MW超超临界机组邻机加热启动技术应用

Application of adjacent boiler heating start-up technology for 1 000 MW ultra-supercritical units

1 000 MW超超临界机组汽轮机普遍采用高压缸启动方式,机组启动冲转时,高压缸排汽温度较低,再热蒸汽冷、热段管道较长,中压缸两端轴承振动大,造成开机时间延长。通过改造邻机加热系统,使邻机蒸汽直接通过冷段管道进入高压缸,实现充分预暖高压缸、均匀加热中压缸的目的,从而延长机组寿命,保护再热器,缩短机组启动时间,减少机组启动费用。

1000 MW ultra-supercritical turbine units generally adopt high pressure cylinder starting mode.During the start-up of the turbine,the exhaust temperature of the high pressure cylinder is low,the reheat steam is cold,the pipe of the hot section is long,bearings at 2 ends of the medium pressure cylinder vibrate acutely,which results in the extension of start-up time.By reforming adjacent boiler heating system,steam of adjacent boiler can directly get into the high pressure cylinder through the cold section pipe,which achieves the purpose of fully preheating the high pressure cylinder and uniformly heating the medium pressure cylinder.Therefore,the lifetime of the unit can be extended,the reheater can be protected,the starting time can be shortened,and the starting cost can be reduced.