Experimental Investigation On Flow Resistance And Separating Performance Of Demister

The wire mesh demister which is seted in the evaporation equipment is used to remove small droplets in the steam to enhance the yield and purity of the produc. At the same time, the performance of large surface area, light weight, long life, easy installation, and low pressure drop make it to be one of separation mode of the horizontal-tube falling film evaporator of desalination unit.An experimental system for flow resistance and separating performance of the wire mesh demister is designed and built. The experiments were carried out in the low-temperature and wet steam environment. The experimental parameters are as follows:Saturated steam temperature of40～80℃C, steam flow rate into the demister is2～8m/s, the thickness of the wire mesh demister is50～150mm, packing density of wire mesh demister is140～210kg/m3, mesh composed of0.2～0.32mm diameter and316L stainless steel wire materials. Wire mesh demister is placed vertically, and the steam level through the demister. The experiment research the influence of the change of different wire the packing thickness, mesh diameter, packing density, steam temperature and steam flow rate to flow resistance and separating performance of demister, then presents a recommendations of how to select demister of desalination unit.The experimental results indicate:the same steam flow rate, flow resistance and demister efficiency decreases with increasing wire diameter. The flow resistance is a linear relationship with the wire diameter, and different wire diameter of demister efficiency with the steam flow rate changes are basically the same trend. The thicker the wire mesh demister thickness, the greater the resistance to flow. Demister efficiency is thinner thickness, the lower the efficiency. In the case of wire diameter and thickness are determined, the packing density increase causes the flow resistance and increase efficiency demister. The same demister in high temperature environment will produce higher flow resistance and higher demister efficiency. The more water content in steam, will increase the efficiency of the demister, but will increase the flow resistance. In the choice of the demister should avoid reentrainment and demister has the highest efficiency and lowest pressure drop demister.