双面对切进口结构的湿法烟气脱硫喷淋塔内流场的数值模拟和实验研究

Numerical Simulation and Experimental Study on the Flow Field in Wet Flue Gas Desulfurization Spray Tower with Two Side Cut Inlet Structure

烟气脱硫喷淋塔一般直径大高度低,处理的烟气量很大,气体进入塔内的几何结构一定程度上影响着塔内流场的分布,从而对SO2的有效吸收及运行性能产生至关重要的影响。常规情况下,烟气从单侧进口以自由射流方式进入喷淋塔,在进口处容易形成回流区、死滞区、涡流区。湿法烟气脱硫系统中的喷淋塔进口结构设计为双面对切进口。通过数值模拟和实验测试相结合的方法,研究了双面对切进口对塔内流场分布的影响。结果表明,采用双面对切进口结构,可以使喷淋塔得到近似于活塞流的均匀流场,从而使烟气均匀一致地通过脱硫喷淋塔,提高了脱硫效率。

Geometric structure of wet flue gas desulfurization spray tower with large diameter and low height affect the distribution of the gas flow field to a certain extent,and further effectively influence the absorption of SO_2 because of the large amount of flue gas. Under normal conditions,the flue gas enters the spray tower with the free jet from one side,and the backflow zone,dead zone and vortex zone are easy to form at the inlet. A wet flue gas desulfurization spray tower with double side cut inlet structure is designed. The influence of the double cut imports of gas on the flow field in the tower was investigated by numerical simulation and experimental test. The results show that the uniform flow field of the piston can be obtained by adopting the double side cutting inlet structure,so that the flue gas can be uniformly and evenly passed through the desulfurization spray tower,so as to improve the desulfurization efficiency.