直接空冷机组真空系统夏季喷淋性能研究  

Study of the Summer Sprinkling Performance of a Vacuum System for Direct-air-cooled Unit

作　　者：赵洪滨[1] 谢攀[1] 吴海霞[1] 

机构地区：[1]中国石油大学(北京)机械与储运工程学院,北京102249

出　　处：《热能动力工程》2015年第3期394-400,492-493,共7页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(51274224)

摘　　要：直接空冷机组真空系统夏季运行背压较高,严重影响机组的安全与经济运行。本研究对夏季真空系统变工况下的喷淋效果进行理论分析,并通过机组喷淋运行试验对模型进行验证,获得了不同喷淋工况下的背压变化规律,并得到了喷水最大蒸发量。研究表明:当喷水量超过喷水最大蒸发量时,机组背压变化较小;在相同喷水量条件下,机组高负荷、高温运行比低负荷、低温运行时的背压降低效果更明显。本研究可为直接空冷机组夏天高温环境下的安全与经济运行提供理论指导。In recent years,the air-cooling technology for power plants has gained a rapid development,especially,the directair-cooling technology for power plants. The latter has become an important development tendency in the northwest of China where is rich in coal but in a lack of water. Direct-air-cooled units will have a relatively high back pressure when operating in summer,seriously influencing the safe and economic operation of units and urgently needing to conduct a study and solve this problem. The authors conducted a theoretical analysis of the sprinkling effectiveness of a vacuum system in summer under off-design operating conditions and performed a verification of the model adopted through a sprinkling operation of the unit. In this process,the variation regularity of the back pressure under various sprinkling operating conditions was obtained and the maximum evaporation amount of water sprinkled was found out. When the amount of water sprinkled exceeds the maximum evaporation amount of water sprinkled,changes in the back pressure of the unit are relatively small. Under the condition that the amount of water sprinkled is constant,the back pressure decline effectiveness of the unit operating at a high load and a high temperature is more conspicuous than that at a low load and a low temperature. Therefore,to start up the sprinkling system when the unit is operating at a high load and a high temperature is relatively economic. The foregoing can offer theoretical guide for safe and economic operation of direct-air-cooled units in a high temperature atmosphere in summer.

关 键 词：直接空冷 运行背压 夏季喷淋 喷水量 性能分析 

分 类 号：TK264.1[动力工程及工程热物理—动力机械及工程]