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Example: Concentration Control in Process

Example: Concentration Control in Process. Introduction. Reactor with two inlet gas mixtures Control gas composition in one measurement point Regulate inlet velocity of the low concentration gas to achieve set value Transient Navier-Stokes, together with Diffusion and Convection.

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Example: Concentration Control in Process

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  1. Example: Concentration Control in Process

  2. Introduction • Reactor with two inlet gas mixtures • Control gas composition in one measurement point • Regulate inlet velocity of the low concentration gas to achieve set value • Transient Navier-Stokes, together with Diffusion and Convection. • PID-control algorithm controls inlet velocity !!

  3. Geometry and conditions • Walls are insulting and no slip • Species diffusivity is: 1e-4 m2/s • Fluid properties of atmospheric air • Initial conditions: • u = 0 • c = 0.5 Top inlet: u=10 mm/s; c=1 mol/m3 Controlled Inlet: u = controlled c = 0.2 mol/m3 Outlet Measurement Point: cset=0.5 mol/m3

  4. PID-control algorithm • Control algorithm set-up in separate geometry for clarity • Equation: • uin is the controlled inlet velocity of the physical model

  5. Concentration and velocity streamlines at 3 seconds Contour: c = cset

  6. P=0.5, I=1, D=1e-3 P=0.1, I=1, D=1e-3 Varying the PID-parameters 1st case results in stable control 2nd case is less stable

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