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Computational fluid dynamics simulation and redesign of a screw conveyor reactor
1Department of Chemical Engineering, University of Louisville, Louisville, KY 40292, USA.
Applied Biochemistry and Biotechnology
|April 1, 2004
Summary
Researchers optimized a shrinking-bed reactor for cellulosic biomass pretreatment. Computational fluid dynamics (CFD) analysis led to a new screw design, achieving even flow for improved biomass hydrolysis and high sugar yields.
Area of Science:
- Biomass Pretreatment
- Chemical Engineering
- Renewable Energy
Background:
- National Renewable Energy Laboratory (NREL) developed a shrinking-bed reactor for constant cellulosic biomass density.
- This reactor enables high sugar yields and reduces solution flushing in pretreatment.
- Scaling up to a pilot-scale screw conveyor reactor aimed to replicate the shrinking-bed effect.
Purpose of the Study:
- To address overmixing and uneven flow issues in the pilot-scale screw conveyor reactor.
- To analyze flow behavior and redesign the screw for improved mixing and flow.
- To utilize computational fluid dynamics (CFD) for simulating fluid flow and validating a new screw design.
Main Methods:
- Experimental investigation of a pilot-scale screw conveyor reactor.
- Analysis of fluid flow behavior within the reactor.
- Computational fluid dynamics (CFD) simulation of fluid flow in porous media.
Main Results:
- Initial experiments revealed overmixing and uneven flow, negatively impacting biomass hydrolysis.
- CFD analysis identified flow issues and informed a new screw design.
- The redesigned reactor, validated by CFD, demonstrated an even flow pattern.
Conclusions:
- The redesigned screw effectively mitigated overmixing and uneven flow in the pilot-scale reactor.
- CFD modeling is a valuable tool for optimizing reactor design for biomass pretreatment.
- The improved flow pattern is expected to enhance biomass hydrolysis efficiency and sugar yield.