Numerical Investigation on the Evaporation Performance of Desulfurization Wastewater in a Spray Drying Tower without Deflectors

Debo Li, Ning Zhao, Yongxin Feng, Xi Zhiwen
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引用次数: 3

Abstract

The desulfurization wastewater evaporation technology with flue gas has been widely applied to dispose of desulfurization wastewater. This paper investigates the effect of flue gas flow rate and temperature, wastewater flow rate and initial temperature, and droplet size on the evaporation performance of the desulfurization wastewater in a spray drying tower without deflectors. The results show that the flue gas flow rate and temperature affect the evaporation performance of desulfurization wastewater. The larger flow rate and higher temperature of flue gas correspond to the faster evaporation speed and the shorter complete evaporation distance of the wastewater droplet. Decreasing the flow rate and increasing the initial temperature of the desulfurization wastewater is advantageous to enhance the evaporation speed and shorten the complete evaporation distance of the wastewater droplet. Reducing the droplet size is beneficial to improve the evaporation performance of the desulfurization wastewater. The orthogonal test results show that the factors affecting droplet evaporation performance are ranked as follows: flue gas flow rate > wastewater flow rate > flue gas temperature > wastewater initial temperature > droplet size. Considering the evaporation ratio and the complete evaporation distance, the optimal setting is 14.470 kg/s for flue gas flow rate, 385 °C for flue gas temperature, 0.582 kg/s for wastewater flow rate, 25 °C for wastewater initial temperature, and 60 μm for droplet size. These studied results can provide valuable information to improve the operational performance of the desulfurization wastewater evaporation technology with flue gas.
无偏转板喷雾干燥塔脱硫废水蒸发性能的数值研究
烟气蒸发脱硫废水技术在脱硫废水处理中得到了广泛的应用。本文研究了烟气流量和温度、废水流量和初始温度、液滴大小对无导流器喷雾干燥塔脱硫废水蒸发性能的影响。结果表明,烟气流量和温度影响脱硫废水的蒸发性能。烟气的流量越大,温度越高,对应的蒸发速度越快,液滴完全蒸发距离越短。降低脱硫废水的流量,提高脱硫废水的初始温度,有利于提高蒸发速度,缩短废水液滴的完全蒸发距离。减小液滴尺寸有利于提高脱硫废水的蒸发性能。正交试验结果表明,影响液滴蒸发性能的因素顺序为:烟气流量>废水流量>烟气温度>废水初始温度>液滴尺寸。考虑蒸发比和完全蒸发距离,烟气流速为14.470 kg/s,烟气温度为385℃,废水流速为0.582 kg/s,废水初始温度为25℃,液滴粒径为60 μm。这些研究结果可为提高烟气蒸发脱硫废水技术的运行性能提供有价值的信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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