Numerical Simulation Of Gas-liquid Two-phase Flow In The Lime Slurry Electrostatic Spraying Desulphurization

The wet Flue Gas Desulphurization method has been one of the most mature and most useful process in the world. With this understanding of introducing electrostatic effect to the wet FGD, the research object of this thesis is a limestone-gypsum wet FGD adsorption column in the use of experimental simulation. We hope that with using computer and suitable experimental method to simulate the flow field inside the adsorption column, the results will offer relational theoretical basis to the application of lime slurry electrostatic spraying desulphurization technology.In this thesis, the particle simulated fluid model is applied to establish two-phase turbulence model of lime slurry electrostatic spraying arrcoding to electrostatic sprayingκ-ε-κ_p turbulence model which has been builded. At the meantime, establishing Ca(OH)₂ droplet adsorption reaction model and SO₂ transfer equation. The turbulence fundamental equations which have been established are used to simulate charged gas-liquid two-phase turbulence in the adsorption column. The different method and crisscross mesh are used in the calculation. Velocity and pressure are taken as original variables to compile operational program by using SIMPLE algorithm, then the mixture continuity equation is used in the modeling. The thesis uses the software STAR-CD to simulate charged gas-liquid two-phase turbulence, then the numerical simulation of planar velocity fields in the charged gas-droplet two-phase turbulent of lime slurry electrostatic spraying is accomplished. In the part of numerical simulation, particle dynamic analyzer (PDA) is used to measure velocity boundary condition of charged spraying droplets.The flow field of electro-spray in the adsorption column is measured by means of PIV. The distributions of velocity vector, velocity nephogram and some other details flow information in the field are obtained. With these researches, we obtain the following research views: In the effect of electrical field, flow field characteristics vary obviously, charging spraying angles change clearly, and lime slurry droplets' diameter is smaller. The whole turbulence flow field is well-proportioned, this result conduces to improve desulphurization efficiency. In the margin of spraying, we see visible entrainment phenomena and inverse flow. Comparing experimental results with numerical simulation results, the consequents indicate that the founded mathematical model can carry out numerical simulation of the charged gas-liquid two-phase turbulence flow field.