切圆喷雾式湿法脱硫塔内流场数值模拟及优化分析

烟气湿法脱硫塔内流场的分布直接影响脱硫效率。对一种在喷淋塔内增设脱硫剂旋流雾化层的流场再造脱硫反应方法进行优化,以Fluent软件为平台,通过改变旋流雾化层喷嘴的布置角度、数量以及浆液喷出的速度等参数,对不同工况下脱硫塔塔内烟气流动状况进行了三维数值模拟与分析。研究结果表明:旋流雾化层的直径比d/D为0.6左右,至少设置8个喷嘴才可形成稳定的螺旋场,浆液从喷嘴喷出的速度在15~20 m/s时有利于塔内烟气处于最佳脱硫速率。此结果对大型锅炉的烟气脱硫塔的改造具有参考作用。

NUMERICAL SIMULATION AND OPTIMIZATION ANALYSIS OF FLOW FIELD IN A TANGENTIALLY SPRAY WET DESULFURIZATION TOWER

The distribution of flow field in the tower of wet flue gas desulfurization affects the desulfurization efficiencydirectly． A kind of desulfurization reaction method adding swirl atomizing layer in the spray tower was put forward． Based onFluent software plant form，this paper studied 3D numerical simulation and analysed the flue gas flow features of differentconditions in the desulfurization tower， reconstructed and optimized the flue gas flow field by changing the parameters of thespray nozzles such as arrangement angle，amounts as well as flue gas spray velocity． The research results indicated that，if thediameters rate d /D of the swirl atomizing layer was about 0. 6 and the amount of the nuzzles was more than eight，the stablehelical field could be formed． In addition，slurry discharged from the nozzle at the rate of 15 ～ 20 m/s was beneficial for theflue gas to be the optimum desulfurization speed range． The result provided reference on the reconstruction of flue gasdesulfurization tower for large-capacity boilers．