Numerical Simulation And Research For The Flow Field Of Demister With Two Streamlined Channels

Demister is the key equipment in the desulfurization system，theperformance directly affects whether the wet scrubbing FGD system iscapable of consistently reliable operation. Demister failure will not onlyresult in desulfurization system outage, and may even lead to the entire unit(system) to stop. Therefore, the scientific and rational design, the use of misteliminators to ensure the normal operation of the wet scrubbing of flue gasdesulfurization system has a very important significance.Two important indicators to measure the mist eliminator performanceare the pressure drop and demisting efficiency of the demister import andexport. Pressure drop the greater the need to add more and more power,higher energy consumption, generally two mist eliminator pressure dropshould be controlled in less than120~200Pa. Demisting efficiency, thelower the flue gas with higher water content, droplet deposition in theabsorber downstream side of the device surface, accelerate corrosion of theequipment, triggering a series of questions, The gas outlet end of the watercontent in the dry state should be controlled as75mg Nm3.The computational fluid dynamics method is used to simulatenumerically the flow field of the demister. The Lagrangian discrete phasemodel follows the Euler-Lagrange approach is used to simulate numericallythe two phase flow of gas and liquid in a demister. The fluid phase is treatedas a continuum by solving the time-averaged Navier-Stokes equations, whilethe dispersed phase is solved by tracking a large number of droplets throughthe calculated flow field. By calculating the demisting efficiency andpressure drop of various demister with different working parameters，their effects on efficiency and pressure drop have been analyzed．Two demistingleaves optimize the design.