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首页> 外文期刊>Engineering Applications of Computational Fluid Mechanics >Numerical simulation on flow and evaporation characteristics of desulfurization wastewater in a bypass flue
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Numerical simulation on flow and evaporation characteristics of desulfurization wastewater in a bypass flue

机译：旁路烟道中脱硫废水流动及蒸发特性的数值模拟

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Owing to the oversimplification of the evaporation model, existing numerical analysis cannot accurately characterize the evaporation characteristics, which has limited its significance for engineering. Therefore, by user-defined programming, a droplet evaporation model in line with the properties of desulfurization wastewater was implemented in numerical simulation. The effects of guiding measures, nozzle arrangement, nozzle layer, flue gas temperature, moisture and droplet diameter on the droplet evaporation in a bypass flue were explored. The numerical results show that the fluctuation of evaporativity due to moisture can be neglected. The uniformity of the flow field with guiding measures is good and the phenomenon of droplets impinging on the wall surface can be prevented. The droplet collision probability without guiding measures may be nearly 60 times higher than that with guiding measures. A reasonable nozzle arrangement increases the droplet evaporation rate and reduces the probability of droplets colliding with the wall surface. An increased number of nozzle layers enhances the droplet evaporation rate and the average temperature in the flue; by estimation, the average temperature in the flue with three nozzle layers is 10.7?K higher than that for two nozzle layers, and 15.8?K higher than that for one nozzle layer. In the condition of higher temperature and smaller diameter, droplets evaporate more rapidly. These research results can provide a reliable reference for engineering practice.
机译：由于蒸发模型的过度简化，现有的数值分析不能准确地表征蒸发特性，这限制了其对工程的重要性。因此，通过用户定义的编程，在数值模拟中实现了与脱硫废水的性能的液滴蒸发模型。探讨了引导措施，喷嘴布置，喷嘴层，烟气温度，水分和液滴直径在旁路烟道中滴注的影响。数值结果表明，由于水分引起的蒸发波动的波动可以被忽略。具有引导措施的流场的均匀性良好，可以防止撞击壁表面上的液滴现象。液滴碰撞概率而不导致措施可能比带指导措施高的60倍。合理的喷嘴布置增加了液滴蒸发速率并降低了与壁表面碰撞的液滴的概率。增加数量的喷嘴层增强了烟道中的液滴蒸发速率和平均温度;通过估计，具有三个喷嘴层的烟道中的平均温度比两个喷嘴层高10.7Ω·k，并且比一个喷嘴层高出15.8Ω·k。在较高温度和较小直径的条件下，液滴更快地蒸发。这些研究结果可以为工程实践提供可靠的参考。

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