Spray dryer LABSPRAY 05 LOOP

continuousfor the pharmaceutical industrylaboratory

Product overview
Inert loop spray dryer (nitrogen closed-loop spray dryer) is a closed-cycle spray drying solution for suspensions containing organic solvents such as ethanol, methanol, acetone, hexane and gas oil. The system uses an inert gas (e.g. nitrogen) as the drying medium to maintain low oxygen levels, prevent oxidation and allow solvent and gas recovery.

Applications

• Drying of materials containing organic solvents or materials that are oxidizable, flammable or explosive.
• Commonly used in precision ceramics, pharmaceuticals, battery materials, cemented carbide (WC-Fe) powder and related industries.

Material types
Designed for suspensions based on organic solvents such as methanol, ethanol, cyclohexane, ether, propyl acetate and acetone.

Features of Inert loop spray dryer

• Nitrogen closed circulation reduces gas consumption, prevents oxidation and enhances experimental safety.
• High-precision oxygen measurement automatically controls feeding based on oxygen concentration.
• Sensitive pressure measurement and automatic pressure relief maintain safe internal pressure.
• Filtration system minimises product loss after drying.
• Multi-stage solvent condensation improves solvent recovery rate.
• Multiple temperature sensors suitable for drying heat-sensitive materials.
• Variable-frequency fan controls inlet/outlet air volume to reduce loss of fine particles.
• Jacketed heating on pipelines reduces heat loss and improves temperature control accuracy.
• Drying tower vortex separators are removable for easier cleaning and maintenance.
• 10-inch LCD touch screen with temperature curve memory for real-time monitoring; construction in stainless steel.
• Optional integrated nitrogen generator reduces dependence on gas cylinders.

Component introduction

• Electronic control system: controller, touch screen, modules, inverter, SSR, temperature sensors — machine brain for precise and stable control.
• Feeding system: batching tank, solvent tank, peristaltic pump and feed pipelines for stirring and delivering slurry to the atomizer.
• Atomization system: centrifugal atomizer, volute, outlet temperature sensor, pressure regulating valve and gauge — produces fine droplets for rapid drying.
• Drying system: drying tower, internal pressure gauge, sight glass, inlet/outlet pipes and inlet filter — solvent evaporates and solids are collected as powder.
• Product recovery system: cyclone separator, cyclone collection tank, bag dust collector and pulse vibrator — staged collection for coarse and fine particles.
• Condensation system: refrigeration unit, condenser, circulation pump and pipes — condenses evaporated solvent for recovery; cooled gas returns to loop.
• Gas circulation system: filters, induced draft fan, heater and inlet air sensor — circulates drying medium through condenser, heater, tower and filters for reuse.
• Intelligent safety system: oxygen analyzer, nitrogen inlet valve, vent valve, safety valve and pressure/differential gauges — automatically control oxygen content, nitrogen filling and pressure relief.

Explosion-proof & safety design

• Three-layer explosion protection:
• Level 1 (basic): inert gas (nitrogen) as drying medium; closed-loop keeps oxygen below safe threshold (system normal when O2 ≲ 2%).
• Level 2 (mechanical): pressure gauges and safety valve; if tower pressure exceeds set point (e.g. >4000 Pa) safety valve opens; if O2 > 2% system vents and fills nitrogen.
• Level 3 (final): explosion-proof rupture disk at tower top opens on abnormal overpressure to protect the system.

Parameter summary (table)

• Product Type: Nitrogen Closed Loop Spray Dryer
• Product Model: LABSPRAY 05 LOOP
• Processing capacity: 5 L/h
• Minimum feed amount: 100 mL
• Drying chamber diameter: φ900 mm
• Atomization structure: Centrifugal atomization system
• Electronic control system: Independent R&D
• Maximum air inlet temperature: ~250 °C (adjustable)
• Hot air condition: Induced air
• Heater power: 10 kW
• Oxygen meter accuracy / range: 0–25%
• Pipeline pressure: 3000 Pa – 5000 Pa
• Machine power (total): 32 kW
• Floor space (L×W×H): 10005 × 4000 × 3510 mm
• Power supply: 3P 380V / 50Hz
• Brief description: 1) Spray chamber, cyclone separator, product and waste collection bottles made of stainless steel. 2) Casing made of SUS304. 3) Optional bag filter to improve recovery rate. Overall dimensions can be adapted to site requirements.