Overview

Two-Fluid Nozzle Spray Dryer

A Two-Fluid Nozzle Spray Dryer uses a combination of liquid feed and high-velocity compressed air to atomize liquids into a fine mist for drying. The energy of the expanding gas shears the liquid into fine droplets, typically with a size range of 10–80 μm.

10-100μm

Particle Size Range

5-500L/h

Custom Made

GMP+

Compliant Design

Two-Fluid Nozzle Spray Dryer

Principle

How Two-Fluid Atomization Works

Two-Fluid Nozzle Spray Drying Diagram

Schematic Diagram of Two-Fluid Nozzle Spray Dryer

01

Liquid Feeding

The liquid feed (solution, emulsion, or slurry) is pumped at a controlled rate to the spray nozzle located at the top of the drying chamber.

04

Hot Air Contact

Hot air enters the drying chamber. The fine droplets instantly come into contact with the hot air, causing rapid evaporation of the solvent.

02

Compressed Gas Supply

Simultaneously, a separate stream of compressed gas (typically air or nitrogen) is fed into the nozzle. This gas provides the kinetic energy needed to break the liquid apart.

05

Instant Drying

The droplets shrink and solidify gradually, forming dry particles. This transformation typically occurs within seconds.

03

Atomization

Inside the two-fluid nozzle, the high-speed gas collides with the liquid. This process breaks the liquid into a fine mist of tiny, uniform droplets, maximizing the surface area for drying.

06

Separation & Collection

The dried particles are carried by the airflow to a cyclone or a bag filter. Depending on the system design, the cleaned exhaust gas is either released or recycled.

Core Component - Two-Fluid Nozzle Atomizer
Pressure Nozzle Atomizer

Two-Fluid Nozzle Atomizer

Pneumatic Atomization

A two-fluid nozzle is an atomization device that uses two separate fluid streams: a liquid feed and a pressurized gas. At the nozzle tip, the two streams meet and the fast gas breaks the liquid into a fine mist.

Unlike rotary atomizers or pressure nozzles, two-fluid nozzles offer precise, independent control over both the liquid flow rate and the gas-to-liquid ratio — making them the preferred choice for pilot-scale R&D, and materials with high viscosity or low feed rates.

Droplet D50 10 - 100 μm
Air Pressure 0.3 - 0.7 MPa
Air-to-Liquid Ratio 0.5 - 5.0 kg/kg
Air Viscosity 200 - 340 m/s
Solid Content 5 - 50 wt%
Nozzle Material 316L / Ceramic

Features

Precise Particle Control

Adjustable atomizing air pressure and liquid feed rate enable fine-tuning of droplet size, directly controlling final particle size distribution from D50 10 μm to 100 μm.

Gentle Thermal Processing

The flash drying prevents thermal degradation, making it the industry standard for heat-sensitive products like enzymes, proteins, and APIs.

Viscosity Handling

It dramatically reduces the risk of clogging. This allows the system to process highly viscous slurries and high-solid-content suspensions.

Stable Low-Flow Atomization

Even at liquid feed rates as low as mL/min, the high-speed gas stream ensures fine, drip-free atomization. This makes it ideal for lab-scale R&D of low-volume materials.

Independent Process Control

Liquid flow rate and atomization gas pressure are adjusted independently, giving operators precise, real-time control over droplet size and spray pattern.

GMP Compliant

Designed as a fully closed system, it minimizes contamination risk and supports validated CIP/SIP procedures for effective cleaning and sterilization.

Specification

Custom configurations are available upon material testing.

Parameter Lab
 Pilot
 Production
Water Evaporation Capacity 5 kg/h 5 - 50 kg/h 50 - 200 kg/h
Inlet Air Temperature 140 - 350 °C (adjustable)
Atomizing Air Pressure 0.1 - 0.7 MPa
Output Particle Size (D50) 10 - 100 μm
Residual Moisture Content ≤ 5% (material-dependent)
Powder Recovery Rate ≥ 95% (with cyclone + bag filter)
Heating Source Electric / Steam / Thermal Oil (optional)
Control System PLC + HMI

Download Full Technical Datasheet

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Applications

Typical Drying Applications Across Multiple Industries

Pharmaceutical

  • APIs
  • Proteins
  • Peptides
  • Antibiotics
  • Liposomes

Food & Additives

  • Whey protein
  • Maltodextrin
  • Coffee Extract
  • Fruit Juice Powder
  • Flavors

Fine Chemicals

  • Molecular Sieves
  • Textile Dyes
  • Surfactants
  • Polymer Microspheres
  • Electronic Chemicals

Cosmetics

  • Collagen
  • Hyaluronic Acid
  • Botanical Extracts
  • Fragrances
  • Ascorbic Acid

FAQ

Answers to the most common technical and commercial questions from procurement managers and process engineers evaluating two-fluid nozzle spray dryers.

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How to control the powder particle size?

Mainly by adjusting:

  • Gas-to-liquid Ratio – Higher ratio → smaller droplets.
  • Nozzle Geometry – Mixing design and orifice diameter.
  • Feed Properties – viscosity and solid content.
Is the two-fluid nozzle system suitable for micro-encapsulation?
Yes. It offers excellent control over capsule size and morphology.
What are the limitations of two-fluid nozzle spray dryers?
  • Lower throughput compared to rotary atomizers
  • Higher compressed gas consumption
  • Possible nozzle wear over long operation
Is a closed-loop nitrogen system required for solvent-based feeds?
For feeds containing flammable organic solvents or oxygen-sensitive materials, a closed-loop inert gas system is mandatory for safe operation.
How is the system to be cleaned?
Cleaning is typically performed via CIP systems, and in pharmaceutical applications, SIP is also implemented to ensure microbial control.