Spray mini dryer SD-18A PRO

for the food industryfor the pharmaceutical industryfor the chemical industry

Product overview
SD-18A PRO is a modular inert-loop mini spray dryer for converting aqueous and organic solvent solutions into powder. The system can be purchased as a basic bench-top unit and upgraded later with a removable closed-loop inert gas module. The design integrates solvent recovery and an oxygen monitoring system to support safe processing of flammable solvents.

Module design — key points

• Closed-circuit (inert loop) module available as a separate upgradeable unit.
• Quick-release construction allows rapid connection/disconnection of the closed-loop module.
• Operable as a bench-top unit or floor-mounted installation.
• Compatible with nitrogen supply from a generator or gas cylinder for inert operation.
• Built on the proven SD-18A platform configuration.

Main configuration (inert loop module)

• Double two-stage condenser for solvent cooling and recovery.
• Connects to tap water or an external circulation chiller as required.
• Advanced oxygen monitoring to verify and maintain safe inert conditions.
• Bag filter system with full stainless-steel chamber and high-quality replaceable filter cartridge (Donaldson).

Meticulous & stable design

• Mechanical structure designed for durability and precision.
• Full stainless-steel construction for product-contact and chamber components.
• High-precision U.S. Spray two-fluid atomizer (standard SS316 nozzle) for consistent atomization.
• Adjustable anti-block (deblock) interval to reduce nozzle clogging.
• Imported electrical and fan components; frequency-conversion control for air supply.
• Siemens PLC control and Schneider electrical components for robust operation and protection.
• Color LCD touch display with data logging and USB export.
• Manufactured under ISO 9001 and ISO 14001 standards.

U.S. Spray two-fluid atomizer

• External-mixing two-fluid nozzle delivers fine, high-precision atomization.
• Independent control of air and liquid streams for viscous liquids and suspensions.
• Nozzle mounted at the top center of the air distributor, spraying downward into the drying chamber.

Air supply system

• Medium-pressure imported blower with rotor-type internal structure.
• Frequency-conversion (inverter) control for stepless adjustment of air volume to meet process requirements.

Application

• Suitable for drying flammable organic solvents and aqueous solutions/suspensions into powders: pharmaceuticals, dyes, pigments, food ingredients, milk/egg products, heat-sensitive materials, polymers/resins, ceramics, fragrances, detergents, adhesives, and more.
• Allows direct conversion of emulsions and suspensions into micron powders without prior filtration, concentration or grinding.

SPECIFICATIONS
Model: SD-18A PRO (upgrade of SD-500/SD-501)
Max evaporator capacity: 2000 ml/h
Pump feeding rate: 50–2000 ml/h (adjustable)
Control system: Siemens PLC; Taiwan 7" color touch LCD; display/control of inlet/outlet temperature, frequency conversion, nozzle deblock frequency; data logging, export and curve analysis; alarms and overload protection
Inlet air temperature: 30–250 °C (control precision ±0.5 °C)
Outlet air temperature: 30–100 °C (control precision ±0.5 °C)
Drying air flow rate: inverter-controlled, 0–70 m3/h (adjustable)
Temperature sensors: PT-100 for inlet and outlet
Spray system: U.S. Spray original two-fluid atomizer (standard 0.7 mm); 0.4 mm and 1.5 mm optional
Particle size: 1–25 μm
Average drying time: 0.8–1.5 s
Anti-block device: automatic deblock function (0–60 s adjustable) and manual deblock
Oxygen detection: ensures oxygen concentration below set threshold (e.g., <3%) before feeding; detection range 0–100% (accuracy 0.1)
Pressure detection range: 0–100 kPa
Explosion-proof module: automatic pressure relief when over preset value (default >3 kPa)
Exproof film: automatic
Electrical standard components: Schneider
Quick release: temperature sensor, air piping and power supply quick-release connectors
Drying chamber size: D 204 mm, H 640 mm
Bag filter size: D 133 mm, H 550 mm
Condenser size: D 159 mm × H 830 mm × 2 (double condenser)
Exhaust pipe diameter: 51 mm
Power supply: AC 220 V, 50–60 Hz
Heating power: 3.0 kW (heater material: 2520 special stainless steel)
Material: full stainless steel body
Weight: 140 kg
Dimensions (H×W×D): 1000 mm × 1005 mm × 1205 mm

BRAND OF MAIN PARTS

• Nozzle: U.S. Spray System, SS316
• PLC: Siemens S7-series
• Touch screen: Taiwan (manufacturer display)
• Fan motor / inverter: Taiwan Delta
• AC contactor, relays, air switch, buttons: Schneider
• Solid state relay: TWITEC
• Rotameter: Dwyer (U.S.)

Technical specifications

• Model: SD-18A PRO
• Max evaporator capacity: 2000 ml/h
• Feed rate: 50–2000 ml/h (adjustable)
• Inlet temp range: 30–250 °C (±0.5 °C)
• Outlet temp range: 30–100 °C (±0.5 °C)
• Air flow: 0–70 m3/h (inverter control)
• Atomizer: U.S. two-fluid nozzle (0.7 mm standard)
• Particle size: 1–25 μm
• Control: Siemens PLC + 7" touch LCD, data logging and USB export
• Safety: oxygen monitor, pressure detection, automatic pressure relief
• Power: AC 220 V, heating 3.0 kW
• Construction: full stainless steel body
• Weight/Dimensions: 140 kg; 1000×1005×1205 mm