Project Overview
RMRDC is undertaking the design and construction of an improved flash dryer to produce high-quality cassava flour more efficiently and reliably than existing units deployed in Nigeria. Flash dryers use high-velocity hot air to rapidly remove moisture from granular and powder materials; however, current installations exhibit gaps in energy efficiency, process control, and product consistency. This project will address those shortcomings by integrating advanced drying technologies, enhanced air-flow and heat-exchange design, precise process control, and energy-optimization features to deliver superior product quality at lower operating cost.
Timeline & Location
Timeline: August 2025 – December 2026
Location: RMRDC Headquarters, Abuja
Current Status: ~25% completed — project initiation, requirements analysis and preliminary design phase underway.
Objectives
To design a flash dryer optimized specifically for cassava flour (particle size, moisture profile, and thermal sensitivity).
To increase drying efficiency and reduce specific energy consumption (kWh/kg) relative to current local units.
To improve product quality metrics: uniform moisture distribution, reduced thermal damage, better colour retention and functional properties for downstream use.
To incorporate robust process control (temperature, air velocity, residence time) and safety interlocks for repeatable operation.
To produce a replicable design package for local fabrication, maintenance, and commercialization.
Project Team (Proposed / Core)
RMRDC — Project coordination, process specification, commercialization pathway.
Department of Agricultural & Food Engineering (partner universities or internal experts) — process design and thermal analysis.
Local fabrication partner(s) — mechanical design details, fabrication, and commissioning.
Energy/Controls contractor — instrumentation, PLC/HMI, and energy optimization.
Food quality & lab team — QA/QC protocols, proximate analysis, functional testing.
Scope of Work / Key Activities (Completed & Planned)
Completed (to date):
Project charter and scope definition.
Baseline assessment of existing flash dryers and identification of performance gaps.
Preliminary process requirements (throughput targets, inlet/outlet moisture, particle size, acceptable temperature thresholds).
In Progress:
Conceptual and preliminary engineering design (airflow modelling, heat-exchange sizing, residence time estimation).
Materials selection and preliminary drawings for dryer body, cyclone/separator, heaters, and feed/exit systems.
Specification of instrumentation (thermocouples, anemometers, mass flow meters) and control architecture.
Planned:
Detailed engineering and CFD validation of airflow and heat transfer.
Fabrication of pilot unit and mechanical/electrical integration.
Commissioning and pilot trials using cassava mash/flour blends; parameter optimization for product quality.
Energy audits and comparison against baseline units; iterative design improvements.
Preparation of manufacturing documentation, SOPs, and maintenance manuals for local replication.
Performance Metrics & Success Criteria
Achieve target throughput (to be defined — e.g., kg/hr) with consistent final moisture within product specification.
Reduce specific energy consumption (kWh/kg) by a measurable margin versus baseline flash dryers.
Product quality: improved colour index, reduced thermal degradation markers, and consistent functional performance in food applications.
Stable operation with automated control of air temperature, velocity and feed rate; minimal operator intervention.
Longevity and maintainability: modular design with locally replaceable parts.
Deliverables
Detailed engineering drawings and technical specification.
Fabricated pilot improved flash dryer and installed control system (PLC/HMI).
Validation & performance report (drying kinetics, energy consumption, quality analysis).
SOPs, maintenance manual, and a commercialization/scale-up roadmap.
Risks & Mitigation
Risk: CFD and prototype results do not meet performance targets.
Mitigation: Use staged testing with adjustable geometry and modular heaters; retain scope for design iterations.
Risk: High energy requirement undermines cost-effectiveness.
Mitigation: Integrate heat recovery (if feasible), evaluate variable frequency drives and phased heating, and run energy optimization trials.
Risk: Difficulty sourcing key components locally.
Mitigation: Specify alternative components and design modular interfaces for future upgrades.
Socio-Economic & Strategic Impact
Value Addition: Improves quality of cassava flour, enhancing its marketability and enabling higher-value uses in food processing.
Post-Harvest Loss Reduction: Faster, efficient drying reduces spoilage and improves shelf life.
Import Substitution: Local fabrication and replication reduce dependence on imported drying equipment.
SME Growth: Creates opportunities for local fabricators, agro-processors and value-chain actors.
Nutrition & Food Security: Enables preservation of cassava in high quality for off-season use.
