高效新型220 MW亚临界汽轮机优化选型分析

Analysis and Optimization on Configuration Scheme of New High Efficient 220 MW Subcritical Turbine

摘要: 以越南某2×220 MW火力发电厂工程的设计、采购、施工(EPC )合同要求为出发点，从技术、能耗方面进行分析，根据国内200 MW等级超高压汽轮机和300 MW等级亚临界汽轮机的特点，通过分析比较两者的差别，提出了220 MW等级汽轮机可采用亚临界参数方案，通过优化叶片型式，减少轴封漏气，提高汽轮机汽缸效率，汽轮机热耗降低至8 026 kJ/kWh，并最终在工程中顺利实施。机组投运后，每年可节约10 161.5 t标煤，提高了机组的经济性，创造了较大的经济效益，可为后续同类项目的汽轮机选型提供参考。

Abstract: Based on the demand of EPC contract for MAO KHE 2×220 MW thermal power plant project in VIETNAM, after analyzing the technology and economy in detail, comparing with the different characters between 200 MW superhigh pressure turbine and 300 MW subcritical turbine, the subcritical parameters were introduced in the 220 MW turbine. By Optimizing blade type, reducing seal leakage and improving the efficiency of the turbine cylinder, the heat consumption rate decreased to 8 026 kJ/kWh. After the turbine operating successfully, each unit can save standard coal equivalent 10 161.5 ton per year. Therefore, it will improve the economy of power plant and create a greater economic benefits. Furthermore, it can provide a good reference for choosing high efficient turbine in the same class power unit.