汽轮机同轴驱动给水泵启动过程及热力性能分析
Analysis on Startup Process and Thermal Performance of Feed Water Pumps Coaxially Driven by Turbines
董伟 1吕蒙 2张巍 1宋亚军 1梅隆 1司派友 1许诚3
作者信息
- 1. 华北电力科学研究院有限责任公司,北京 100045
- 2. 华北电力科学研究院有限责任公司西安分公司,陕西 西安 710000
- 3. 华北电力大学能源动力与机械工程学院,北京 102206
- 折叠
摘要
针对汽轮机同轴驱动给水泵技术在国内机组的首次应用,对该设备首次启动过程及遇到的问题进行了详细介绍,并针对启动过程中调速之星各主要参数的变化进行了综合分析,同时基于机组实际运行数据对不同给水泵驱动方案热力性能进行了计算分析.结果表明:润滑油压过高、输入端转子油膜失稳是造成冲转过程中调速之星输入端轴系振动大的主要原因,可通过完善控制逻辑、优化启动过程解决该故障;机组升降负荷过程中应尽量减少调速之星在切换区的停留时间,以避免调速之星减摩轴承温度快速升高;汽轮机同轴驱动给水泵方案节能效果显著,在100%THA、50%THA、30%THA 工况,相较小汽轮机驱动方案,机组供电煤耗率可分别降低 1.15 g/kWh、1.84 g/kWh、1.32 g/kWh.
Abstract
Aiming at the first application of feed water pumps coaxially driven by turbines in domestic power plant units,problems encountered during first start-up process of the unit were introduced in de-tail.The changes of the main parameters of the vorecon in the starting process are comprehensively ana-lyzed.Based on the operating data of the unit,the thermal performance of different feedwater pump drive schemes were calculated and analyzed.The research results indicate that:high lubricating oil pressure and unstable oil film of rotor at input end are the main cause of the accident of large shafting vibration at the input end of vorecon during impulse starting,which can be resolved by improving control logic and optimizing the startup process.During the process of lifting and lowering the load of the unit,the resi-dence time of the vorecon in the switching area should be minimized as much as possible to avoid rapid temperature rise of the anti friction bearing.The energy-saving effect of the coaxial drive feedwater pump scheme for steam turbines is significant.Under 100% THA,50% THA,and 30% THA,com-pared to the small turbine drive scheme,the coal consumption rate of the unit's power supply can be re-duced by 1.15,1.84,and 1.32 g/kWh,respectively.
关键词
汽轮机同轴驱动/给水泵/调速之星/启动过程/热力性能Key words
coaxial drive of steam turbine/feed water pump/vorecon/startup process/thermal performance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据