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Control of Gas Composition in a Reactor with Inlet Mixtures: PID Algorithm Application

This study focuses on the control of gas composition in a reactor with two inlet gas mixtures, utilizing a PID control algorithm. The objective is to regulate the inlet velocity of a low concentration gas to achieve a designated set value at the outlet measurement point. The system is modeled using transient Navier-Stokes equations and considers diffusion and convection effects. Initial conditions and fluid properties of atmospheric air are established to analyze concentration and velocity streamlines, leading to insights on PID parameter variations and their impact on control stability.

mackenzie-gibbs
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Control of Gas Composition in a Reactor with Inlet Mixtures: PID Algorithm Application

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Presentation Transcript

  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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