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喷雾蒸发冷却技术在钢厂转炉和电炉烟气处理工程中有广泛的应用,对于喷雾蒸发机理的研究是建立在单个水滴蒸发的研究基础之上的。本文依据简化的工况,考虑了水滴内部环流、蒸发过程中的变物性、Stefan流,建立了单水滴蒸发的非等温模型。研究了对流环境下高温气体中水滴的蒸发特性,获得了不同环境温度、水滴初始条件下水滴半径和温度等参数的变化规律。研究发现,水滴的蒸发过程存在快速加热和稳态蒸发两个阶段;初始直径对瞬态阶段的影响较大,而对稳态阶段影响不大;水滴越大,滑移速度对蒸发的影响也越大。对喷雾水滴蒸发特性的数值模拟,为进一步研究液滴群在高温烟气中的蒸发提供更可靠的方法。
Spray evaporative cooling technology is widely used in the converter and furnace flue gas treatment of steel mills. The study on the mechanism of spray evaporation is based on the research of single droplet evaporation. In this paper, based on the simplified conditions, the non-isothermal model of single-drop evaporation was established by considering the internal circulation of water droplets, the variation of Stefan flow in the evaporation process and Stefan flow. The evaporation characteristics of water droplets in high temperature gas under convection were studied. The variation of water droplet radius and temperature under different ambient temperature and water droplet initial conditions were obtained. The results show that there are two stages of rapid evaporation and steady state evaporation. The initial diameter has a great influence on the transient phase but not on the steady state. The larger the water drop, the more the influence of the slip velocity on the evaporation The bigger The numerical simulation of the evaporation characteristics of spray droplets provides a more reliable method for further studying the evaporation of droplets in high temperature flue gas.