蒸发冷却器内双流喷嘴雾化及蒸发特性数值模拟

炼钢

蒸发冷却器内双流喷嘴雾化及蒸发特性数值模拟

李海英，刘东，张春奇

（华北理工大学冶金与能源学院，河北唐山 063210）

接受日期:1900-01-01 出版日期:2018-12-05

Numerical simulation of twin-fluid atomization characteristic and evaporation characteristic of evaporative cooler

Accepted:1900-01-01 Online:2018-12-05

摘要/Abstract

摘要： 采用欧拉-拉格朗日法，建立三维瞬态数学模型研究转炉蒸发冷却器双流喷嘴液膜破碎过程，分析了气液质量比对液滴索特平均直径(SMD)的影响和液滴粒径对蒸发效率的影响。比较了模拟结果和试验数据，结果表明：模拟结果与试验数据吻合度较好，模型可靠；液滴SMD随气液比增大而减小，最佳气液比为0.1，此时液滴SMD为63 μm；液滴在烟气中运动，穿透距离受初速度影响较小，主要与粒径大小相关。粒径小于250 μm的雾滴均能在0.6 s内蒸发完全，但粒径不同，完全蒸发所需时间不同，最高相差20多倍。

关键词: 雾化特性, 蒸发, 数值模拟, 气液两相流, 烟道气

Abstract: A comprehensive three-dimensional mathematical model, which adopted Euler-Lagrange approach, was developed to study the liquid membrane broken of twin-fluid atomizer in evaporative cooler. The influence of air-liquid mass ratio on Sauter Mean Diameter (SMD) of droplet and droplet size distribution on evaporation efficiency were analyzed, and the simulation results were compared with the experimental data. The results show that the simulation results coincide with the experimental data. The result shows that the SMD of droplet decreases with the increase of air-liquid ratio. The bestair-liquid ratio is 0.1,the SMD of droplet is 63 μm. Droplet penetration distance are less affected by initial velocity, which is mainly related to particle size. The simulation showed that with the diameter of droplet getting smaller, the complete evaporation time of droplet become shorter. Droplet with diameter less than 250 μm can be completely evaporated in 0.6 s, butthe maximum evaporation time of different drop diameter is 20 times higher.

Key words: atomization characteristic, evaporation, simulation, gas-liquidflow, flue gas

李海英，刘东，张春奇. 蒸发冷却器内双流喷嘴雾化及蒸发特性数值模拟[J]. 炼钢.

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