亚临界600 MW汽轮机通流改造技术方案研究与应用

介绍了宁电亚临界600MW汽轮机通流改造技术方案的研究与应用情况。首先，分析了宁电亚临界600MW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状况。其次，调研了国内亚临界300MW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600MW汽轮机改造后可达到的性能指标。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。改造后性能试验表明，汽轮机热耗率降低了332 kJ/（kW·h），经济效益显著。

Research and Application of Flow Path Retrofit Upgrade of the Subcritical 600 MW Turbine in Ninghai Power Plant

In this paper, the research and application of flow path retrofit upgrade of the subcritical 600MW turbine in Ninghai Power Plant are introduced. Firstly, the performance and the existing problems of the subcritical 600 MW unit are analyzed, and the output status of the turbine before the upgrade is determined. Secondly, the achievements of the 300 MW steam turbine flow path retrofit upgrade projects in China and the guaranteed performance data from the manufacturers are studied; the thermal checking caluclation is conducted to get the expected performance index of the subcritical 600 MW steam turbine after the upgrade. Finally, the optimized design schemes, such as the cold end optimization and the final stage blade selection, are proposed after considering the upgrade schemes provided by the manufacturer to determinethe final scheme. With the flow path retrofit, the specific heat consumptionof the steam turbine is reduced by 332 kJ/(kW·h), and the economic benefit is remarkable.