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电厂空冷技术近年来得到飞速发展,尤其是电站直接空冷技术,已成为我国西北富煤缺水地区燃煤电厂的重要发展方向.本文对真空系统进行分析,研究系统内各设备的用能情况,结果表明:直接空冷凝汽器效率很低,不到5％,其(火用)损可达90 MW.通过对真空系统进行性能分析,为机组的安全与经济运行提供理论指导.“,”In recent years,air-cooling technique for power plant has been developed rapidly,especially direct air-cooling technology,which has been a significant development direction for the north-west region where is lack of water and rich of coal.In this passage,researchers have carried on the exergy analysis for vacuum system,studied the energy dissipation for each facility.The results show that:direct air-cooling condenser has a low efficiency of exergy,less than 5％ and the exergy loss can be up to 90MW.By means of analysis of performance for vacuum system,this article can provide theoretical direction for the safety and efficient operation of the unit.