Study On The Performance Of Normal Distribution Arc Plate In Demister In The Gas Water Mist Transportation System

With low concentrations of coal mine gas two-phase flow of water mist technology in coal mine safety transport used successfully to promote the rapid development of low concentration gas for power generation. However, the presence of low concentrations of gas for power generation gas mist directly affects the efficiency of the generating set, so the low- density gas in the separation of water mist needs further research needs. Through the mist of low density gas phase flow in normal type mist eliminator in the analysis, the structural parameters obtained under different operating conditions and parameters demister separation efficiency and pressure drop, the result of lower coal provide a theoretical basis for the selection of the concentration of gas dewatering equipment mist two-phase conveying systems security.Based on normal distributed arc plate demister separation efficiency and pressure drop are studied, first, based on a cross- mixing turbulence model, the mist particles by the defogger and the movement carried out by the force analysis, calculated demister separation efficiency; using homogeneous flow and fractional flow model, the two-phase pressure drop of gas mist in the calculation of the theoretical derivation defogger analysis, defogger the pressure drop is calculated. Secondly, the choice of FLUENT software in the normal two-phase field type mist eliminator aerosol separation efficiency and pressure drop numerical simulation, simulation process selection RNG turbulence model and DPM discrete phase model. Finally, verify the separation efficiency and pressure drop of demister according to test results.Numerical simulation and experimental results showed that: the same structural parameters getting off work conditions change parameters affecting the efficiency of the demister more obvious, and further draw the structure of the combination of droplet diameter for different types of blades, blade length demister 150 mm, turning angle of 60 o, can be removed when the droplets 10 to 20 plate spacing 20mm; demister blade length 150 mm, turning angle of 90 o, the droplets can be removed when the plate 20 or the spacing 30mm; defogging plate spacing, blade length, turning angle and flow velocity has an impact on the pressure drop, the larger the change in flow velocity impact on the demister pressure drop, the pressure drop increases with increasing gas velocity; turning angle change on the defogger biggest drop, drop as the turning angle increases.The contrast of pressure drop value under different gas velocity, with the gas velocity increases, the level of pressure drop for mist eliminator increases slowly, while two-level showed a sharp drop mist eliminator increases, the efficiency of both eliminator close two demister demisting efficiency level than the demister demisting efficiency improved slightly, but the drop is great.