船用脱硫塔烟道喷雾脱硫模拟及试验分析

Simulation and experimental analysis of desulfurization of flue spray in marine desulfurization tower

以型号MAN 9L32/40的船用柴油机额定工况下排放的烟气为研究对象,根据双膜理论建立SO2的传质模型,通过用户自定义函数将SO2的吸收程序导入Fluent软件中,对脱硫塔进口烟道处不同位置是否开启高效雾化喷嘴的脱硫情况进行模拟,并通过实验对模拟结果进行对比验证。结果表明,烟道处开启高效雾化喷嘴可有效提高烟气进入塔后分布的均匀性。在入口SO2质量分数为0.002 4,3层喷淋层正常运行条件下,分别开启入口烟道左侧面和左+右的组合侧面的高效雾化喷嘴,脱硫效率分别由95%提高至96.78%,98.4%。该脱硫效率的模拟数值与试验数值相比,误差较小。

The smoke emitted by the marine diesel engine of the model MAN 9L32/40 under rated conditions is the research object.The mass transfer model of SO2 was established according to the two-film theory.The absorption program of SO2 was introduced into Fluent through the user-defined function in order to simulate the desulfurization condition when the high-efficiency atomizing nozzle is opened or not at different positions in the inlet flue of the desulfurization tower,and the simulation results are compared and verified by experiments.The results show that the high-efficiency atomizing nozzle at the flue can effectively improve the uniformity of the distribution of flue gas after entering the tower;At the inlet SO2 mass fraction is 0.0024,under the normal operating conditions of the 3-layer spray layer,the high-efficiency atomizing nozzles on the left side and the combined side of the left side and the right side of the inlet flue are respectively opened,the desulfurization efficiency is increased from 95%to 96.78%,98.4%.