船舶废气脱硫蒸发冷却器数值模拟

Numerical Simulation of Evaporative Cooler for Desulfurization of Ship Exhaust Gas

大多数船舶湿法烟气脱硫系统中都是采用蒸发冷却段和洗涤段不分区的一段式洗涤塔,导致了烟气冷却后相对湿度和蒸发量不高,进而除微粒效果不理想,对此本文提出了一种将用于蒸发的冷却液和用于脱硫的洗涤液区分开来的独立循环蒸发冷却系统。本研究运用Fluent软件对蒸发冷却器进行仿真数值模拟,并分析载荷改变对蒸发冷却器冷却过程的影响。结果表明,当载荷减少时,可将液气比从1L/Nm3提升至1.5L/Nm3来提高高温烟气出口的相对湿度,分析结果可为船舶废气中细微颗粒的脱除提供参考。

Most ship wet flue gas desulfurization systems use a one-stage scrubber with an evaporative cooling section and a scrubbing section that are not partitioned,resulting in low relative humidity and evaporation of the flue gas after cooling,and the effect of removing particles is not ideal.This article proposes an independent circulating evaporative cooling system that separates the cooling liquid used for evaporation and the washing liquid used for desulfurization.This study uses Fluent software to simulate the evaporative cooler and analyzes the impact of load changes on the cooling process of the evaporative cooler.The results show that when the load decreases,the liquid-to-air ratio can be increased from 1L/Nm3 to 1.5L/Nm3.Increase the relative humidity of the high-temperature flue gas outlet,and the analysis results can provide a reference for the removal of fine particles in the ship’s exhaust gas.