逆流湿式自然通风排烟冷却塔的数值模拟

基于气液两相间传热传质及流动理论,针对冷却塔内不同区域的工作特性,建立了加入烟道后逆流湿式自然通风冷却塔三维数学模型.采用欧拉-拉格朗日方法对塔内连续相和离散相运动进行分析,考察了烟道对冷却塔性能的影响,同时研究不同侧风速度下排烟冷却塔的工作状态,将所得结果与传统冷却塔进行对比.结果表明:常规冷却塔内加入排烟管会增强冷却塔的冷却效果;侧风会减小冷却水在冷却塔中的温降且不利于塔口烟气排放;侧风会加剧冷却塔上部内壁面腐蚀情况.

Numerical Simulation of Counter Flow Natural Draft Wet Cooling Tower with Flue Gas Injection

Aiming at working characteristics of different zones in cooling tower， a three-dimensional numerical model of counter flow natural draft wet cooling tower with flue gas injection was established based on the theories of heat/mass transfer and flow between air and water. The motion of continuous and dispersed phases in cooling tower was investigated by Euler-Lagrange approach and the effect of cooling performance by setting up flue gas injection had also been taken into account. Meanwhile， the working performance of cooling tower under diverse crosswind velocities was analyzed， in contrast with that in a traditional cooling tower without flue gas injection. The results showed that the setup of flue gas injection had positive effect on the working efficiency of cooling tower. The crosswind decreased the drop degree of cooling water， which was harmful to gas emission. Moreover， crosswind could also increase corrosion drastically near the tower outlet.