大型直接空冷系统管内湿蒸汽分布特性

Inspecting the running direct air-cooled power plant, temperature difference between condense units reflects the uneven flow distribution of each unit. Studying the steam flow rate distribution in the air-cooled condenser(ACC) makes great sense on the performance and further optimization of direct air-cooled condenser. Take the 600MW direct air-cooled power plant as an example, this thesis build the three-dimensional mathematical and physical model of flow and heat transmission in the exhaust tube, analyze the pressure and temperature filed of wet steam in the tube through the simulation method under the critical operating condition, gain the rule of flow distribution in the direct air-cooled condenser and verify the conclusion by the infrared thermal imaging. Considering the influence of ambient wind, it gets the running condition of the plant. It draws the conclusion: the flow shows a large variation in the inlet of air-cooled condenser and place where the pipe diameter changes; the steam flow rate distribution is concerned with the inlet parameter of each condenser in the same cooling capacity; the exterior flow field leads the distribution of condenser under the ambient wind.