600MW直接空冷机组加装尖峰冷却装置改造及性能分析

摘要

The higher operating vacuum pressure of air-cooled power plant greatly affects the safety and power output of steam turbine in summer,so the method of reducing air temperature by peak load cooling system in used.The tide over summer capacity of air cooled condenser can also be improved by this method.This paper states on peak load spray humidification changed in Datang Binchang power generation Co.Ltd.We are contrast and analysis direct air-cooled vacuum after the peak load spray humidification used in different load and different temperature in summer.The vacuum press reduce 4.9kPa,5.1 kPa,3.3kPa in different loading of 600MW,550MW,500MW and different temperature of 26℃ ～31 ℃.The higher efficiency of spray humidification in 550 ～ 600MW,the efficiency will lower in small loading and high air-cooled vacuum; lastly,we are estimate the economy efficiency in full loading of steam turbine.%为解决空冷发电厂夏季高背压运行影响汽轮机安全问题,保证机组的出力,直接空冷机组都采用了尖峰冷却装置,以提高直接空冷机组渡夏能力.介绍大唐彬长电厂机组空冷尖峰喷淋装置的改造,并针对夏季高温时段,不同负荷、不同环境温度下,投运尖峰冷却装置后机组真空的变化进行了对比分析;结果表明,机组在600MW、550MW、500MW负荷运行且环境温度26℃～31℃时,机组的背压分别下降4.9kPa、5.1kPa、3.3kPa.机组在550MW～ 600MW运行时,投运尖峰冷却装置效率最高,负荷越低,背压越低时,投运尖峰冷却装置效率越低;最后对机组在满负荷运行情况下所取得的经济效益进行了评估.