超大型湿冷塔进风流场及导流装置数模研究及应用

摘要

Based on the Fluent software, we used the standard k-εmodel to close the Reynolds average equations and analyze the heat and mass transfer process in the three-dimensional of the natural draft wet cooling towers ( NDWCT) for the specific project.We cal-culated the fields of air velocity and temperature inside and outside the cooling tower and established the relevant equations and gas-water two-phase heat and mass transfer theory models.Combined with the actual situation of the project, we deeply analyze the Flow Field of the cooling tower:1) the existence of windshield board reduces the air flow around the tower side flow rate and increases the symmetry of the cooling tower inlet flow field, so that the uniformity of tower aerodynamic field was increased.Installation height and length of windshield board have a greater impact into the air flow field.Especially, the 11m high, 8m long windshield board im-prove the performance of#1,#2 cooling tower mostly.2) Installation angle and blocks number of windshield board have certain im-pact into the air flow field.When the windshield board angle change from 0°to 20°and the blocks number change from 60 to 90, there was little changes of cooling performance between the two towers.%基于Fluent软件，采用标准k－ε湍流模型进行应力封闭，对某工程塔内传热传质过程进行三维数值计算。计算分析了塔内外空气的速度场、温度场，建立了相关方程及气水两相间传热传质理论模型。结合工程实际情况，对冷却塔进风流场进行深入分析：1）导风板的存在降低了塔侧空气绕流流速，增大了冷却塔进风口流场的对称性，使塔内空气动力场的均匀程度增加；导风板安装高度和长度对冷却塔进风流场产生较大影响，以高11 m、长8 m导风板对＃1、＃2冷却塔性能的改善作用最大；2）导风板安装角度和块数对冷却塔进风流场产生一定影响，在导风板安装角度由0°至20°变化、在导风板安装块数由60块至90块变化时，两塔冷却性能变化影响较小。