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空冷机组的背压影响机组建设投资和运行费用,因此,背压是空冷汽轮机设计、制造的重要参数。影响其背压的主要因素有:大气环境温度、空冷初始温差、凝汽器的端差。确定环境温度通常采用6000h法和+5℃以上温度平均法。机组存在最佳的初始温差,使其综合技术经济性最好。末级叶片设计时,应考虑适应排气点的排气面积、叶片承受容积流量剧烈变化的能力、叶片中的应力在适当水平、叶片有良好的可膨胀性、叶片采用加强型和高机械阻尼的结构。
The back pressure of the air-cooled unit affects the unit construction investment and operating costs. Therefore, the back pressure is an important parameter in the design and manufacture of the air-cooled steam turbine. The main factors that affect its back pressure are: atmospheric temperature, initial temperature difference of air-cooling, condenser end-point difference. Determine the ambient temperature is usually 6000h method and +5 ℃ above the temperature averaging method. The unit has the best initial temperature difference, making it the most comprehensive technical and economical. The final stage blade design should consider the exhaust area to adapt to the exhaust point, the ability of the blade to withstand dramatic changes in volumetric flow, the stress in the blade at a suitable level, the blade has good expansibility, blades with enhanced and high mechanical damping Structure.