基于夏季环境温度变化的不同形式间接空冷系统运行特性研究OACHSSCD

The characteristics of indirect air-cooling system are greatly affected by factors such as ambient temperature.Therefore,this paper selects two different forms of technology-optimized indirect air-cooling tower systems,namely,the three incorporate tower type and the main-auxiliary combined type,to study the operating characteristics of the unit under the change of ambient temperature in the summer using CFD(Computational Fluid Dynamics).The results show that the heat exchange situation of both sides of the two types of indirect air-cooling systems deteriorates most seriously with the increase of ambient temperature.When the ambient temperature reaches 40℃and 39℃,the outlet temperature of circulating water reaches 68.1℃and 62.5℃,respectively.Nevertheless,in the main-auxiliary systems,the influence of the rising ambient temperature on the heat exchange of the main engine is only 54.9%of that of the auxiliary area,which shows that it has a greater impact on the heat exchange of auxiliary engines.But the heat transfer uniformity of each fan section of the main engine is not affected.The increase in ambient temperature will have a great impact on the system performance,the higher the ambient temperature,the higher the operating back pressure of the system.Under high-temperature conditions,it is necessary to apply cooling measures to the unit to ensure normal operation.In addition,the main engine back pressure of the main-auxiliary systems is not affected by the auxiliary engines as the temperature rises.