Overview

Rotary Atomizer Spray Dryer

A Rotary Atomizer Spray Dryer, also known as a Centrifugal Spray Dryer, is the most commonly used type of spray drying system. It is mainly used to rapidly convert liquids, such as solutions, suspensions, and slurries, into dry powders or granules.

The system uses a high-speed rotary atomizer to disperse the liquid into fine droplets by centrifugal force. The droplets are then brought into contact with hot air, where moisture evaporates instantly, resulting in a dry, free-flowing powder.

20-300μm

Particle Size Range

1-10s

Fast Drying

10+t/h

Evaporation Capacity

Rotary Atomizer Spray Dryer

Principle

Step-by-Step Breakdown of a Rotary Atomizer Spray Dryer

Rotary Atomizer Spray Drying diagram

Schematic Diagram of Rotary Atomizer Spray Drying

01

Liquid Feed

The liquid material is pumped from the feed tank through a filter and flow control system to the top of the drying chamber, where the rotary atomizer is located.

02

Centrifugal Atomization

The liquid enters the center of a high-speed rotating disk or wheel. The atomizer spins at very high speed, generating strong centrifugal force that breaks the liquid into a large number of fine droplets.

03

Hot Air Introduction

At the same time, ambient air is drawn in, filtered, and heated to the required inlet temperature. The hot air is then directed into the drying chamber, usually in a co‑current or mixed flow around the atomizer cloud.

04

Droplet Drying

The fine droplets come into immediate contact with the hot air. Moisture is vaporized almost instantly, while the droplet temperature remains relatively low due to the evaporative cooling effect.

05

Powder Formation

After moisture removal, the droplets are transformed into solid particles, forming dry powder or granules during their fall through the drying chamber.

06

Separation and Collection

The dried particles are collected at the bottom of the chamber or separated from the exhaust air using a cyclone separator and bag filter.

Core Component - Centrifugal Atomizer
Centrifugal Atomizer

Centrifugal Atomizer

High-Speed Drive Motor

Core

Combined with a variable frequency drive, the drive motor serves as the power source of the centrifugal atomizer. Frequency inverter enables stepless speed control from 10,000 to 24,000 RPM, adapting to diverse feed viscosities and target particle sizes.

Atomizing Disk / Wheel

Key

The atomizing disk is responsible for converting the liquid feed into fine droplets. The typical disk diameter ranges from Ø50 mm to Ø300 mm. The peripheral speed is set to 90-180 m/s to achieve a target D50 of 20-300 μm.

Central Feed Pipe & Distributor

Feed

The distributor ensures an even and continuous flow of liquid across the rotating disk, resulting in stable atomization and consistent powder quality.

Features

Controllable Droplet Size

By adjusting the rotational speed of the atomizing disk and the feed rate, the final product particle size can be precisely controlled (D50 typically in the range of 20-300 μm).

Wide Capacity Range

A single unit can handle feed rates ranging from a few hundred grams per hour at laboratory scale to tons per hour at industrial scale, making it suitable for lab trials, pilot studies, and full-scale manufacturing.

Strong Feed Adaptability

Unlike pressure nozzles, a rotary atomizer is less prone to clogging and can handle liquids containing particles, fibers, or relatively high viscosity.

Specification

LPG Series Data Sheet

Parameter 5 25 50 100 150 200+
Inlet Temp. 140-350°C adjustable
Outlet Temp. 80-90°C
Max. Evap. Capacity 5 kg/h 25 kg/h 50 kg/h 100 kg/h 150 kg/h 200+ kg/h
Atomizer Drive Pneumatic Drive Motor Drive
Atomizer Speed 10,000-25,000 rpm
Atomizer Disk Size Ø50 mm Ø100 mm Ø120 mm Ø140 mm Ø150 mm Ø180-340 mm
Heat Source Electric / Steam Electric / Steam / Oil / Gas
Dry Powder Recovery Rate ≥95%

All specifications subject to change. Custom configurations available for models 200+.

Download Full Technical Datasheet

Get the complete specifications, and performance data in one document. PDF · ~2MB

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Applications

Typical Drying Applications Across Multiple Industries

Pharmaceutical

  • Antibiotics
  • Vitamin C
  • Herbal Extracts
  • Ceftriaxone Sodium
  • Amoxicillin-clavulanate Potassium

Food & Additives

  • Whole Milk Powder
  • Whey Protein
  • Coffee Extract
  • Fruit Juice Powder
  • Starch

Fine Chemicals

  • Disperse Dyes
  • Organic Pigments
  • Surfactants
  • Silica & Fumed Silica
  • Organic Intermediates

Advanced Materials

  • Lithium Iron Phosphate (LFP)
  • NCM / NCA Cathode Materials
  • Alumina Ceramics
  • Battery Precursors
  • Silicon Carbide

FAQ

Answers to the most common technical and commercial questions from procurement managers and process engineers evaluating rotary atomizer spray dryers.

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How can I control the particle size of the final product?

The main factors include:

  • Rotational speed – The higher the speed, the finer the droplets.
  • Feed viscosity & feed rate – Higher viscosity or faster feed rate tends to produce larger droplets.
  • Atomizer disk structure – Different blade shapes (flat disk, vaned disk, grooved wheel) affect how droplets break up.
What are the common problems of a rotary atomizer spray dryer in operartion?

The typical problems include:

  • Vibration / noise – May be caused by improper cleaning or bearing damage; requires shutdown for inspection and cleaning.
  • Wall sticking – Caused by improper feed rate/viscosity; can be remedied by adjusting feed rate and inlet/outlet temperature.
  • Low collection efficiency – Check whether the cyclone separator or bag filter is clogged.
  • Product contamination – Replace filters regularly and clean the system thoroughly.
What maintenance does the rotary atomizer require?
Routine maintenance includes inspection of the atomizing wheel, bearings, drive system, and feed distributor. Regular cleaning and scheduled replacement of wear parts help ensure stable long-term operation.
Can the system support automatic operation?
Yes. Equipped with PLC or HMI control, our system provides automated regulation of the drying process.
Is the system easy to clean?

The system can be configured with different cleaning options:

  • Manual Cleaning – Key components are designed for quick disassembly to facilitate cleaning and maintenance.
  • CIP system – Automated internal cleaning without disassembly.