超超临界二次再热1000MW汽轮机组通流效率能耗敏感性定量分析

Quantitative Sensitivity Analysis of Energy Consumption for Cylinder Efficiency of An Ultra-supercritical Double-reheat 1000MW Steam Turbine Unit

以超超临界二次再热1000MW汽轮机为研究对象,采用汽轮机定功率变工况计算方法,对汽轮机超高压缸、高压缸、中压缸及低压缸在THA、75%THA、50%THA、40%THA工况下进行能耗敏感性定量分析,得出上述工况下各缸效率变化对汽轮机热耗率的影响规律。结合锅炉热效率及厂用电率设计值得出THA工况下汽轮机通流效率对机组发电煤耗及供电煤耗的影响规律。结果表明,缸效率对热耗率及煤耗的影响随缸效率的变化基本呈线性关系,低压缸效率的能耗敏感性最大,中压缸效率次之,高压缸及超高压缸效率变化对能耗的影响较小。分析结论可为超超临界二次再热1000MW机组进行节能诊断及节能管理与评价工作提供技术参考。

Taking an ultra-supercritieal double-reheat 1000MW steam turbine as an example, the quantitative sensitivity analysis of energy consumption of the ultra-high pressure cylinder, high pressure cylinder, medium pressure cylinder and low pressure cylinder were carried out in the conditions of THA, 75% THA, 50% THA and 40% THA based on the calculation method of rated power and variable condition, the influence of each cylinder efficiency change on the heat consumption rate of steam turbine is obtained. It is concluded that the influence of steam turbine efficiency on coal consumption in THA condition according to the design value of boiler efficiency and auxiliary power rate. It turns out, the effect of cylinder efficiency on heat consumption and coal consumption is basically linear, the efficiency of low pressure cylinder is the most sensitive, the efficiency of medium pressure cylinder is second, the efficiency of high pressure cylinder and ultra-high pressure cylinder has little effect on energy consumption. The conclusion can provide technical reference for energy conservation diagnosis and energy conservation management and evaluation on the ultra-supercritieal double-reheat 1000MW steam turbine.