摘要
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。
The packing area of a super large-scale natural draft wet cooling tower（SLNDWCT）is enormous and partitional water distribution method is adopted in engineering,which the water distribution pipelines get longer and wind resistance increases in the inner area of the tower.The numerical simulation method based on conventional towers with uniform water distribution and air distribution is no more applicable.In this paper,the numerical simulation model for heat and mass transfer of gas-water two-phase is established for SLNDWCT.Based on the calculation results of spray pipe network,partitional water pressures are considered in simulation by UDF,and three typical season cases of real tower verified the accuracy of the model.Besides,based on different water distribution methods（different distances for air intake in outer zone and different water spray rates）,simulations are used to study the spray water rates（inner and outer zones） cooperating with the air intake distance in outer zone,as well as the two factors influencing the water temperature of cooling tower.And the heat exchange efficiency is assessed by analyzing the average water temperatures of inner and outer zones in the tower pond.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2016年第9期1888-1894,共7页
Journal of Engineering Thermophysics
基金
湖北省自然科学基金资助项目(No.ZRY2014000891)
关键词
冷却塔
配水系统
热质交换
优化设计
数值仿真
cooling tower
distribution system
heat and mass transfer
optimal design
numerical simulation
