国华定电亚临界600 MW汽轮机通流改造技术方案研究与应用

Research and Application of Flow Path Retrofit Solution of Subcritical 600 MW Turbine

为了提升机组的经济性和安全性,对定电亚临界600 MW汽轮机进行了通流改造技术方案研究。首先,分析了定电亚临界600 MW机组改造前性能和存在的问题,确定了改造前汽轮机性能和出力现状。其次,调研了国内亚临界300 MW汽轮机通流改造业绩,以及各通流改造厂商的性能保证值,并进行了热力校核计算,分析得出亚临界600 MW汽轮机改造后可达的性能指标。最后,针对制造厂提供的通流改造方案,提出了冷端优化、末级叶片选型等优化设计方案,从而确定了改造的最终方案。定电一期1号、2号汽轮机通流改造现场工作分别于2015年10月、2016年1月开始实施,改造后性能试验表明,汽轮机热耗分别降低了322.5 kJ/kWh、342.5 kJ/kWh,经济效益显著。

In order to improve the economy and safety of the unit,flow path retrofit solution of subcritical 600 MW turbine on Dingzhou power plant is investigated.Firstly,the performance and existing problems of the subcritical 600 MW unit are analyzed,and the performance of the turbine on active service are determined.Secondly,after overall considering the performance of 300 MW steam turbine through flow path retrofit,the guarantee performance value of 600 MW turbine flow path retrofit,and heat balance caculation,the thermal performance of the subcritical 600 MW steam turbine are specified.Finally,the optimal design is put forward,then the final solution is determined.After flow path retrofit,the heat rate of No.1 and No.2 steam turbine was reduced by 322.5 kJ/kWh and 342.5 kJ/kWh respectively,and the economic benefit was remarkable.