Armfield FT32 Drum Dryer

Overview

The Armfield FT32 Drum Dryer is a precision-engineered, bench-scale rotary drum drying system designed for controlled thermal dehydration of granular, crystalline, and powdered materials in academic, R&D, and pilot-process environments. It operates on the principle of indirect conductive heating via steam-jacketed twin rotating drums, enabling uniform heat transfer to the material bed as it tumbles through the heated zone. Unlike convective dryers, the FT32 minimizes oxidative degradation and volatile loss by limiting direct exposure to hot air—making it particularly suitable for heat-sensitive or solvent-containing feedstocks. Its modular construction supports integration into larger process training rigs (e.g., Armfield’s FT series unit operations platform), and its transparent access panels allow real-time observation of material motion, agglomeration behavior, and drying front progression.

Key Features

• Steam-heated twin-drum configuration with independently adjustable rotation speed (0–15 rpm) for optimized residence time control
• Stainless-steel drum surfaces (304 grade) with precision-machined internal flights to promote consistent material lift and cascade patterns
• Integrated steam pressure regulator and condensate trap assembly, compliant with BS EN 13445 for pressure equipment safety
• Adjustable drum inclination (0°–5°) to modulate material retention time and throughput rate
• Digital temperature monitoring at drum shell surface and exhaust duct, with 0.5 °C resolution and NIST-traceable calibration options
• CE-marked enclosure with interlocked safety guard, emergency stop, and thermal cut-off at 120 °C surface temperature

Sample Compatibility & Compliance

The FT32 accommodates batch loads of 0.5–2.0 kg per cycle, supporting particulates ranging from 50 µm to 5 mm in nominal size—including hydrated salts, polymer granules, pharmaceutical intermediates, and agricultural biomass. It is compatible with materials exhibiting initial moisture contents between 5% and 70% w/w. The system meets essential requirements of the Machinery Directive 2006/42/EC and carries UKCA marking for post-Brexit compliance. When operated under documented SOPs, it supports GLP-compliant drying trials and serves as a validated training platform for ISO 9001-certified quality laboratories. Optional accessories include a gravimetric moisture analyzer interface and exhaust gas sampling port for VOC emission profiling per ISO 11890-2.

Software & Data Management

While the base FT32 operates via analog controls and local instrumentation, it is fully compatible with Armfield’s optional UOP3000 data acquisition module. This interface enables synchronized logging of drum speed, steam inlet pressure, shell temperature, exhaust humidity (via capacitive sensor), and elapsed drying time at 1 Hz resolution. Exported CSV files conform to ASTM E2500-18 guidelines for raw data integrity and are structured for direct import into MATLAB, Python (pandas), or JMP for kinetic modeling (e.g., Page model, Modified Henderson–Pabis). Audit trail functionality—including user login, parameter changes, and calibration events—is available when paired with Armfield’s LabVIEW-based FT Control Suite, satisfying FDA 21 CFR Part 11 requirements for electronic records in regulated environments.

Applications

• Teaching mass and energy balance calculations in chemical engineering unit operations courses
• Empirical determination of critical moisture content and falling-rate drying kinetics
• Evaluation of drum surface fouling resistance and cleaning-in-place (CIP) protocol development
• Scale-up correlation studies between lab-scale drum geometry and industrial rotary dryer performance
• Thermal stability assessment of active pharmaceutical ingredients (APIs) during low-temperature drying
• Moisture profile mapping in co-processed excipients for solid dosage form development

FAQ

What steam pressure range is required for optimal operation?
The FT32 is designed for saturated steam supply at 1–3 bar(g), with integrated pressure regulation to maintain ±0.1 bar stability during steady-state drying.
Can the FT32 be used with superheated steam?
No—superheated steam is not recommended due to risk of localized overheating and inconsistent drum surface temperature distribution.
Is explosion protection available for solvent-laden feeds?
Yes; ATEX-certified variants (II 2G Ex db IIB T3 Gb) can be supplied upon request, including intrinsically safe temperature sensors and purge-ventilated control cabinet.
Does Armfield provide drying kinetics teaching modules?
Yes—the FT32 is supported by Armfield’s FT32-EDU educational manual, containing 8 guided experiments aligned with EFCE and IChemE learning outcomes.
What maintenance intervals are recommended?
Steam trap inspection every 200 operating hours; drum bearing lubrication every 1,000 hours; full calibration verification annually or per ISO/IEC 17025 internal audit schedule.