Numerical Simulation Of Tapered Aaberg Exhaust Hood Capture Pollution Of Particle

The rapid development of industrial production brought to the environment pollution, although production process and purification technology in perfect order to reduce emissions of pollutants, but every year of the total discharge of still growing. Local ventilation is control of pollutants in the work place sends out and spread the most commonly used and effective control measures. Traditional exhaust hood (accept cover except) only to breathe in flow as control air, breathe in mouth along axis of the speed control with distance attenuation increases fast, effectively narrow range. The Danish manufacturers of the proposed new exhaust hood Aaberg with jet, and the flow of gas flow in compound as control flow, the jet flows under the action of inspiratory completely overcome traditional exhaust hood shortcomings, not only increased exhaust hood role of distance and breathe in and with directional sex. Cone jet flow under the action of inspiratory, is blowing air exhaust air cover from the cone horn to sew spout injection, and breathe in flow of the formation of the superposition and breathe in the flow. This paper using CFD on cone jet flow under the action of capture pollutants in numerical simulation, the particles with air pollutants in stress and movement characteristics of air pollution sources and breathe in the mouth, send out rate and breathe in distance from the mouth of cone jet flow under the action of the pollutants in capture influence.This paper with CFD software, the most widely used in the engineering project of gas-solid two-phase turbulent model-particles orbital model, this model with Lagrange method (i.e. tracking of orbiting particles method) to describe the particle movement, it put the gas as a continuum, and the particles as gas phase and the slip of (slip can be very large), along the orbit of the discrete itself, particle group and gas mass, momentum and energy interaction as a medium of continuous distributed in two phase flow of the source material, space momentum source and energy source. Because in this in the calculation model of particle group smaller diameter, concentration is low, particle on the influence of the gas is not large, so the method of solid grain to ignore the effect of gas, and only consider gas on the role of the particles. So, be the first to simulate the tapered Aaberg exhaust gas flow field of the cover; Again in the flow field simulation particle trajectory, through the simulation calculation results from different working conditions capture efficiency.Through the related analysis and calculation, the main draw the following conclusion:the CFD method, the two equations and particle track model under the action of the cone jet breathe in flow capture pollutant can get pollutants in the flow field of the trajectory and the concentration distribution, through the simulation results obtained exhaust hood capture efficiency with air breathe in mouth increases with the increasing of; Pollution sources in the mouth axis and breathe in sending out the direction and speed of flow direction in the same in, send out the greater the rate of pollutants, cone-shaped Aaberg exhaust air for the smaller cover; Pollution sources in the mouth axis and breathe in the farther away from breathe in mouth, cone-shaped Aaberg exhaust hood of the required air; Through the calculation can quantitative analysis in under the condition of the same, cone-shaped Aaberg exhaust hood exhaust hood than traditional energy saving at least15%above.