The Experiment Investigatement Of Fine Particles In Waste Gases Removal Performance Enhanced By Outfield In Simulated Rainfall

In recent years,air pollution has become increasingly serious.How to develop new dust removal technology to effectively and economically recover fine particulate matter in the atmosphere has become one of the urgent problems to be solved.Based on the nucleation mechanism of fine particle vapor phase variability,We establishes an experimental system for the experiment investigatement of fine particles in waste gases removal performance enhanced by outfield in Simulated rainfall,and applies it to the environment of closed pipeline space,high gas velocity and atmospheric volume and preliminarily established the optimal test parameters of the research platform.Firstly,the physical properties and particle size analysis of the FCC catalyst and fly ash fine particles used were made.Then,the four types of sprayer used in the test were calibrated using a phase Doppler particle analyzer(hereinafter referred to as PDPA).The results showed that the particle size and distribution of the droplets produced by the A2 type sprayer were better and the best use.The conditions are:a water pressure of about 0.5MPa,a wind pressure of 0.5 to0.6MPa,a water volume of 20 to 25 kg/h,an air volume of 1.2 to 1.8 m~3/h,and a Souter diameter(hereinafter referred to as SMD)of 20 to 30?m.Finally,using the experiment investigatement of fine particles in waste gases removal performance enhanced by outfield in simulated rainfall research platform,the effects of relative humidity,water volume,cyclone gas inlet gas velocity and residence time on the outlet concentration of the cyclone exhaust pipe were investigated.The result show that among the various influencing conditions,the relative humidity has a significant impact on the overall device system.When the relative humidity reaches 90%or more,the fine particle outlet concentration of the exhaust pipe is significantly decreased.The water volume should be controlled at 20g/m~3 and the residence time should be controlled at about 1s to meet the requirement of reducing the system outlet concentration to 10mg/m~3.The cyclone gas inlet gas velocity is in the range of 10?35m/s.The outlet concentration of the fine particles of the tube decreases with the increase of the gas velocity,and with the increase of the inlet gas velocity,the pressure drop of the system increases gradually from 0.5 to 7k Pa.The specific system pressure drop?P and the swirl inlet gas velocity satisfy?P=4.93V~2.