间接空冷机组变工况运行特性的数值研究

Numerical research and analysis on operation performance of indirect air-cooled units in different conditions

分别建立了大型间接式空冷机组凝汽器热力计算模型和空冷塔特性模型,利用数值模拟软件Fluent完成了数值模拟.提出了一种机组冷端系统耦合迭代的模拟方法,对凝汽器和空冷塔的热力性能进行迭代计算,可对机组冷端系统进行变工况特性分析.以某600MW间接空冷机组为对象进行了算例分析,验证了所提方法的正确性,还分析了环境温度和侧风风速对整个机组冷端系统运行特性的影响关系,研究表明外界环境参数变化时,机组冷端系统具有一定的自平衡能力.

Thermal calculation models of the condenser and air-cooled tower of large-scale indirect air-cooled unit were established separately . And numerical simulation was completed with software Fluent .A coupled iteration method of cold-end system of the unit was proposed ,which can be used to analyze operation performances of the system in different conditions ,by each iteration coupling of thermal performances of condenser and air-cooled tower .In the present work ,a 600 MW indirect air-cooled unit was taken as an example and effects of ambient temperature and crosswind on the perform-ance of the cold-end system were explored as well .The result shows that the proposed method is valid and correct and the cold-end system has self-equilibrium ability w hen environment condition varies .