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由于超大型自然通风冷却塔(超大塔)淋水填料截面积巨大,所采用的分区配水方式配水管线较长,且内区进风阻力增加,以常规塔均匀配水及配风方式的数值模拟理论已不适用。本文针对超大塔分区不均匀配水系统方式,建立了气水两相热质交换数值仿真模型,基于配水喷淋管网计算结果,通过UDF将分区配水压力带入到仿真中,通过对实际超大塔3种季节运行工况的模拟及分析,验证了计算模型的准确性。其次,通过提高外区、降低内区淋水密度的方式,提出具有不同外区进深和淋水密度的配水方案,采用上述模型进行模拟,研究了内、外区淋水密度与外区进风距离的配合关系,通过分析内、外区集水池平均水温判断超大塔热值交换效率,给出了外区进风距离、淋水密度对出塔水温的影响规律。
Due to the huge cross-sectional area of the gypsum water-filled packing of the super-large natural ventilation cooling tower (tower), the water distribution and water supply in the district is longer and the resistance of the air in the inner zone increases. Based on the numerical simulation theory Not applicable. In this paper, a numerical simulation model of gas-water two-phase heat and mass exchange is established for the non-uniform water distribution system of large tower. Based on the calculation results of water distribution pipe network, the water distribution pressure of the sub-zone is brought into the simulation by UDF. The simulation and analysis of three seasonal operating conditions verified the accuracy of the model. Secondly, the water distribution scheme with different depths and waterlogging densities was proposed by increasing the outer area and decreasing the inner waterlogging density. The above model was used to simulate the water distribution density of the inner and outer areas and the inlet wind Distance and the relationship between the outer and inner watershed by analyzing the average water temperature to determine the super-tower heat exchange efficiency, gives the outer zone into the wind, water density on the tower out of the water temperature law.