ENG. ANDREW OMWENGA
Chemical & Process Simulation Engineer • Thermodynamic Specialist
Gas-Solid Fluidized Bed System & Hydrodynamics Simulation
Section 1.0 — Simulation & Facility Metadata
Section 2.0 — Executive Summary
Hydrodynamic simulation of gas-solid fluidized bed reactors in Aspen Plus, evaluating minimum fluidization velocity, bubble dynamics, bed expansion, and cyclone separation.
Section 3.0 — Problem Statement & Operating Bottlenecks
Uneven gas distribution in fluidized beds causes gas channeling, poor catalyst contact, and excessive solid entrainment into downstream units.
Section 4.0 — Objectives & Rigorous Simulation Methodology
Ergun equation combined with Kunii-Levenspiel bubbling bed model in Aspen Plus Solids. Gas velocity varied from 0.05 m/s to 1.2 m/s.
Section 5.0 — Simulation Results & Thermodynamic Findings
Operating at U = 4.5 x U_mf provided optimal gas-solid contact efficiency with minimal slugging. Pressure drop across distributor plate validated at 15 kPa.
Section 6.0 — Core Engineering Takeaways
Section 7.0 — Model Assumptions & Future Recommendations
Electrostatic particle agglomeration forces were not included in solids friction calculations.
Eulerian-Eulerian CFD coupling for detailed 3D gas bubble diameter distribution mapping.
Section 8.0 — Consultant Conclusion & Verification Sign-off
Solid flow sheet modeling in Aspen Plus enables precise hydrodynamic prediction for catalytic fluidized bed reactors.
