Numerical simulations of particle deposition on super-heaters

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Presentation transcript:

Numerical simulations of particle deposition on super-heaters A fundamental study Oslo, 2010.02.16 Nils Erland L. Haugen

Introduction Main focus: Particle inertial impaction No thermophoresis, eddy diffusion or Brownian motions This work has been done under the NextGenBioWaste project

Simulations Direct Numerical Simulations (DNS) are used No modeling No filtering All space and time scales are resolved Including the thin but important boundary layer around the cylinder The Pencil-Code 128 CPUs

The Stokes number

Particle impaction (0.01<St<0.3) Re=20 Re=420 Re=6600

Front side impaction efficiency

Front side impaction efficiency Classical impaction Boundary stopping Boundary interception

Back side impaction

GKS (MSWI in Schweinfurt, Germany) Super heater fluid specifications:

GKS particle impaction Re=20 Re=420 Re=1685

Impaction efficiency as function of particle diameter Three orders of magnitude

Impaction rate Particle mass density pr. bin (independent of bin size)

Conclusion DNS is required in order to resolve the important boundary layer Both the front and the back side impaction depends strongly on Reynolds number The total mass impaction rate at the super-heater of the GKS plant is totally dominated by particles larger than ~30 microns

Turbulence

Single cylinder vorticity Re=20 Re=420 Re=6600

Particle impaction (0.4<St<40) Re=20 Re=420 Re=6600

Alternative to the Stokes number