PFSD Series Precision Fluidized Spray Dryer

Product details

The Precision Fluidized Spray Dryer (PFSD) is one of the most successful designs of spray dryers ever developed.It is used to dry a widely of products many of which are extremely difficult to produce in powder form using conventional drying technologies.

In addition, the PFSD combines fluidization and spray drying technologies,enabling the size and structure of particles to be easily controlled.Therefore,the PFSD is often used as a spray dryer agglomerator or spray dryer granulator, in which drying is completed while very low powder temperature is kept. Its another important function is that it can be applied perfectly in the drying and formation of heat sensitive products.

PFSD precision fluidized bed spray dryer can directly prepare products with the following specifications from liquid raw materials:

◆ Powder products (average particle size 50μ~100μ)

◆ Grain products (average particle size of 150μ ~ 400μ)

◆ Fine products (average particle size 70μ ~ 120μ)

Feluwa Branded Diaphragm Pump

To control product quality by controlling the main process parameters, such as product moisture content, particle structure, particle size distribution, solubility, mixing, wetting, to maintain the original taste and flavor. quality and Highly reliable quality parts can enable the plant more efficient and longer service-life, and the cleaning-in-place systems (CIP) can maximately extend the effective production time.

Technical Advantage:

● Free flowing powder is produced in agglomeration or granulation course.

● Produced powder having a very low content of small particles(As is referred to as dust-free particles).

● It can dry many thermoplastic and hygroscopic products that cannot be processed by other equipment;

● Ideal for heat sensitive products as particle temperatures are kept low throughout the drying　process.

● Due to the use of low-temperature drying, the volume density of the product is increased and the air content is reduced.

● Drying is completed at low outlet drying temperatures, giving high energy utilization efficiency.

● The fine powder in the exhaust gas is reduced, and the product loss is reduced.

The structure and composition of the equipment

● Atomizer

Nozzle or rotary atomizers are used to spray the feed liquid into droplets.

● Air disperser

A roof-mounted design controls the air flow pattern in the drying chamber.

● Hot air system

Provides hot air for drying. Incorporates oil,gas,steam,and electrical heating units.

● Drying chamber

Cylindrical chamber with a fluid bed mounted in the　conical base.

● Exhaust air system

Separates airborne particles from the drying air leaving the drying chamber.Cyclones and or bag filters are used.

● Powder handling system

In pneumatic or vibratory systems, or vibratory systems,or externally mounted fluid beds.

Rotary Atomizer disk

Process advantages and characteristics of PFSD Fluidized-bed

Spray Dryer ( with Upper Air Venting)

I. High pressure liquid conveying characteristics

With Tri-piston high pressure pump in accordance with food hygiene requirements.

Frequency conversion speed-adjusting is applied to Motor, and a stable fluid output without pulse.

The maximum output pressure is up to 300bar.

With high pressure pipeline insulated, maintaining fluid emulsification and viscosity characteristics.

II. Spray nozzle atomization characteristics:

High pressure spiral nozzle atomization, the pray angle and spray pressure can be selected according to the material viscosity and atomized droplet diameters.

Low temperature air stream protection around atomizing nozzle, preventing the nozzle seal from the induced failure due to high temperature .

III. Drying tower characteristics:

Dry tower air flow model is a kind of mixed fluid mode;

High-speed hot air stream travels downward vertically at the center of dryer top without deflective flow, contacting with the atomized droplets fully at the center of hot air outlet, enhancing the effect of heat transfer ;

Upper-air-exhaust-tower drying is a kind of mixed flow drying, and droplet flow course is divided into : co-current flow for constant rate drying period, mixed flow air-exhaust for deceleration drying period, and hot air jet is diffused to drying tower cone bottom, and then it is baffled to return upwards, so that the material being dried is separated with the air. When the air flows upward speedily, a giant Ring-shaped Air Curtain comes into being along the tower internal wall, thus the wet powder is isolated with tower internal wall, and effectively the powder can be prevented from conglutinating on the tower wall. At the same time, the drying time is increased and the drying air’s heat energy is more effectively utilized.

The material can be winnowed, and fine powder is separated from side exit of the circumference of the tower top and flows into cyclone separator; the coarse particles straightly drop down to the fluidized bed at the bottom inside the tower.

IV. IFB characteristics:

The materials are dried/ cooled in fluidized condition, which is stable and uniform under a state at low temperature and humidity inside the internal fluidized bed. It can reduce dust conglutination at the tower bottom to the maximum. It is easier to produce dust-free granular products; It is particularly suitable for the materials with such properties as: the high fat content, poor thermal stability, thermoplastic, hygroscopic and adhesive at high moisture content. These materials are such as dairy products, microencapsulated flavor, coffee mate, egg yolk powder, fruit and vegetable powder etc.

V. EFB characteristics:

For the final fluidization drying and cooling of products, to obtain dust-free products in compliance with the regulation on moisture content and temperature, to maintain the consistency of the nature of the product.

The piston-fluid is applied to fluidize, resulting in a uniform drying and cooling to dry the materials. The frequency of the vibration motor and exciting force can be adjusted to control the fluidized drying / cooling time.

VI. Characteristics of agglomeration process by fine-powder-return:

Fine powder collected by the cyclone is conveyed by positive pressure air to the atomization zone of the drying tower, then it collides and conglutinates with droplets and wet particles, and the agglomerated particles are formed.

Refs. Flow Chart

Technical Parameters

Product testing, process exploration and technical services

Xiandao Company is a professional factory specialized in the process research, design and fabrication for spray drier and fluid bed granulator.

The company sets up the special lab to provide the test service for clients (chargeable), and the obtained technical data will provide important basis to select and design for the large-scale equipment.

We are also responsible to provide the optimized plant’s configurations, model-selecting and design, and we also guide the clients to fulfill the installation, commissioning and training for the operators, and imparting the practical operation experiences.