The invention provides a start-up mode of a two-turbine regenerative small steam turbine. The inlet side of a small steam turbine is connected with a feed pump through a speed-regulating device, and the exhaust side is connected with a power balance generator. The small steam turbine throttles steam distribution through a high parameter steam source of reheated steam in the cold section of an ultra-high pressure cylinder, and the working steam of a small steam turbine passes through two main steam regulating valves. Enter the intake chamber tangentially from both sides of the cylinder. When the large steam turbine is running with 10% rated load, start the regenerative small steam turbine, control the intake steam volume by adjusting the valve, put the feed water pump outlet to the inlet bypass into operation, and adjust the speed of the feed water pump by adjusting the speed regulating device, so that the feed water pump runs at low speed and low load; when the large steam turbine is running with 10% rated load, the small steam turbine runs and rises to 3000r. After stabilization, the grid is connected with the initial load, and the load is raised to the full opening of the valve, then the small machine is heated and pressurized to increase the load. When the main engine has 20% rated load, the steam pump and electric pump run side by side. When the main machine has 30% rated load, the electric pump withdraws from operation, and the small machine increases its load according to the load curve.
【技术实现步骤摘要】
一种双机回热小汽轮机启动模式
本专利技术涉及汽轮机发电设备
,尤其是涉及一种双机回热小汽轮机启动模式。
技术介绍
630℃1000MW超超临界二次再热汽轮机再热温度升高引起回热抽汽温度、过热器温度相应升高,达到580℃,为降低回热抽汽设备用材档次,汽轮机采用了双机(大汽轮机和小汽轮机组成的机组)回热系统。高温段回热抽汽从小汽轮机中抽取,最高抽汽温度不超过超高压缸排汽温度,即440℃。双机回热系统除解决回热抽汽设备用材,还提高汽轮机经济性,降低电厂投资成本。双机回热小汽轮机除了带有给水泵,还带小发电机和6级回热抽汽,双机回热小汽轮机在满足给水泵耗功的同时,必须满足回热系统的需要,不仅要考虑升降负荷时回热抽汽小汽轮机运行,还要考虑特殊工况的要求,所以双机回热抽汽小汽轮机的启动运行模式不同于常规给水泵启动运行模式,是一个多变量多系统相互协调,较难控制的过程。
技术实现思路
本专利技术要解决的技术问题是:针对现有技术存在的问题,提供一种双机回热小汽轮机启动模式,以解决双机回热小汽轮机启动运行中多变量多系统相互协调,较难控制的问题。本专利技术要解决的技术问题采用以下技术方 ...
【技术保护点】
1.一种双机回热小汽轮机启动模式,其特征在于:小汽轮机的进汽侧通过调速装置连接给水泵,排汽侧连接一台额定功率发电机,小汽轮机通过超高压缸冷段再热蒸汽高参数汽源节流配气,小汽轮机的工作蒸汽通过两只主汽调节阀从汽缸两侧切向进入汽缸进汽腔室,大汽轮机冲转后带10%额定负荷时,启动回热小汽轮机,通过调节阀控制进汽量,给水泵出口至进口旁路投入运行,由调速装置调节给水泵转速,使给水泵低速、低负荷运行,大汽轮机冲转后,小汽轮机启动汽源由超高压排汽冷段再热蒸汽供汽,冲转蒸汽参数为:冷态启动:进汽压力:2.5~3.0MPa;进汽温度:300℃~350℃;过热度≥50℃;升速率200r/min ...
【技术特征摘要】
1.一种双机回热小汽轮机启动模式,其特征在于:小汽轮机的进汽侧通过调速装置连接给水泵,排汽侧连接一台额定功率发电机,小汽轮机通过超高压缸冷段再热蒸汽高参数汽源节流配气,小汽轮机的工作蒸汽通过两只主汽调节阀从汽缸两侧切向进入汽缸进汽腔室,大汽轮机冲转后带10%额定负荷时,启动回热小汽轮机,通过调节阀控制进汽量,给水泵出口至进口旁路投入运行,由调速装置调节给水泵转速,使给水泵低速、低负荷运行,大汽轮机冲转后,小汽轮机启动汽源由超高压排汽冷段再热蒸汽供汽,冲转蒸汽参数为:冷态启动:进汽压力:2.5~3.0MPa;进汽温度:300℃~350℃;过热度≥50℃;升速率200r/min/min,升负荷率1%/min;温态启动:进汽压力:2.5~3.0MPa;进汽温度:300℃~350℃;过热度≥50℃;升速率300r/min/min,升负荷率1%/min;热态启动:进汽压力:≥2.5~3.0MPa;进汽温度:350℃~400℃;升速率400r/min/min,升负荷率1.5%/min,小汽轮机转速升至3000r/min,稳定后并网带初负荷,提升负荷至阀门全开带满负荷。2.根据权利要求1所述的一种双机回热小汽轮机启动模式,其特征在于:所述的大汽轮机和小汽轮机组成的机组配备1台电动给水泵,大汽轮机启动时由电动给水泵给锅炉供水,大汽轮机带30%额定负荷时,小汽轮机给水泵出口压力升高至电动给水泵出口压力,小汽轮机给水泵与电动给水泵并列运行,逐渐减小电动给水泵出力,当电动给水泵流量减小到一定程度,停止电动给水泵,由小汽轮机给水泵满足锅炉给水的要求,大小汽...
【专利技术属性】
技术研发人员:张晓东,曹守洪,王建伟,高展羽,王鑫,王娟,翟璇,李志明,谢涛,赵海峰,
申请(专利权)人:东方电气集团东方汽轮机有限公司,
类型:发明
国别省市:四川,51
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