宁海电厂1000MW超超临界机组无电泵启动及运行方式优化研究

发布时间：2018-10-17 22:31

【摘要】：本文从宁海电厂1000MW超超临界机组的工程实际出发,研究了国内外已投产和在建的1000MW超超临界机组给水泵的配置情况,分析了无电泵配置在初期投资以及机组启动、停止和正常维护阶段的经济优势,探讨了取消电泵对机组运行方式所带来的变化,同时从汽动给水泵可用系数、非停系数、故障原因等方面论证了汽动给水泵的可靠性。另外,结合宁海电厂1000MW机组的实际工程进度,研究了汽动给水泵、给水旁路调节阀以及再循环调节阀等重要运行设备和阀门的相关特性,成功进行了主要包括汽动给水泵转速流量特性试验,给水流量主、旁路阀切换试验,给水旁路调节阀流量特性试验,汽泵再循环调节阀特性试验,汽泵低速运行给水流量试验,汽泵带负荷特性试验,单汽泵最大出力试验,小机低压汽源切换等试验。最后,深入研究了锅炉在三个不同阶段的给水控制策略和给水泵汽轮机的控制系统,实现了机组启动时全程给水自动,同时成功进行了机组RB试验和甩负荷试验,从而最终验证了百万兆瓦机组配置两台汽泵能够满足机组启停及事故情况下的运行需求。
[Abstract]:Based on the engineering practice of 1000MW ultra-supercritical unit in Ninghai Power Plant, this paper studies the configuration of feedwater pump of 1000MW ultra-supercritical unit which has been put into production and is under construction at home and abroad, and analyzes the initial investment and unit start-up of the no-electric pump configuration. The economic advantages in the stage of stop and normal maintenance are discussed, and the changes brought about by canceling the electric pump to the operating mode of the unit are discussed, and the reliability of the steam feed water pump is demonstrated from the aspects of the availability coefficient, the non-stop coefficient and the fault cause of the steam feed pump. In addition, combined with the actual project progress of the 1000MW unit in Ninghai Power Plant, the related characteristics of important operating equipment and valves, such as steam feed water pump, feed water bypass regulating valve and recirculation control valve, are studied. The successful experiments include speed flow characteristic test of steam feed water pump, feed water flow master, bypass valve switching test, flow characteristic test of feed water bypass regulating valve, steam pump recirculation control valve characteristic test, steam pump low speed running feed water flow test, Steam pump with load characteristic test, single steam pump maximum output test, small machine low pressure steam source switching test. Finally, the feed water control strategy of boiler in three different stages and the control system of feed pump turbine are studied in depth. The whole process of feed water supply is realized when the unit starts up. At the same time, the unit RB test and load rejection test are successfully carried out. Finally, it is proved that two steam pumps can meet the operational requirements in the case of start-up, shutdown and accident of a million-megawatt unit.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM621

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