Drying System

We offer different types of drying systems depending on the nature of products to be dried and the characteristics of dried product required. The drying systems are designed for one-step transformation of liquid feeds/ wet cakes / pastes to powder. Depending on the nature of product the suitable material of construction is selected for product contact parts. The system is supplied as a turnkey equipment consisting of following systems.

Slurry preparation/ Mixing / Feeding System. Air heating system. Feed atomization/ dispersion/ agitation system. Dry product collection/ conveying system. Dust / Fines collection of either one or combination of following systems. High efficiency cyclone separator. Bag filter. Wet scrubber. Electrostatic precipitator. Controls and instrumentation comprising of simple motor control center and indicating and controlling instruments. Option of PLC controlled system for automatic operation of the complete plant is also offered. The drying systems are either open loop, semi closed loop or closed loop depending on the nature of solvent in the feed and the necessity of recovering the solvent. Depending on the nature of feed following types of drying systems are offered.

Special features:

Semi or fully automatic cleaning system Rotary atomiser with inert gas purging Air disperser for rotary and nozzle atomiser Controlled noise level

Explosion protection for Drying chamber Weather proof finish for outdoor installation Wide range of applications, sizes and Configurations. Tailor made system as per customer requirement..

Advantages:

Flexibility of drying different product in one dryer. Shortest down time for maintenance. Efficient controlling system for powder quality.

Save energy. Increased production rate. Better powder quality.

Applications:

Dyestuffs, Pigments Starch Detergents Milk Powder Plants Food Industries Herbal Extract

Protein Hydrolysate Ceramics, Clay Minerals Pharmaceuticals Enzymes

Spray dryers are offered for feeds in liquid form containing either water or any other solvent. Feeds may be solution, slurry or emulsion. Depending on the particle size of the final product required and the nature of feed any one or combination of following atomization system is used.

• Two fluid atomization.
• High pressure single fluid atomization.
• Rotary disc atomization.

The final product obtained from spray dryer is in powder form. By varying the operating parameters of the spray dryer the required powder characteristics such as moisture, particle size, bulk density, flowability, Particle Morphology etc. can be achieved.

Besides manual and semi-automatic systems we offer PLC & SCADA based systems for easy operation and monitoring of spray dryer. Multiple systems can be operated from a single computer thus reducing the manpower requirement. All the important parameters like temperatures, pressures, flow etc. are recorded and displayed in the system and can be retrieved at any given moment.

Capacity : The spray dryers having water evaporation capacity ranging from 1kg/hr to 18,000 kg/hr can be offered and supplied.

Operating temperatures : The spray dryers having operating temperatures up to 1100°C can be offered and supplied.

CIP Systems : We offer integrated cleaning in place (CIP) systems in the spray dryers for automatic and fast cleaning of the complete system. This feature is essential where multiple products are dried in a single system and frequent washing is required.

Typical applications of spray dryer are Dyestuffs, pigments, starch, detergents, milk powder, fruits, pharmaceutical, herbal extracts, food flavors, ceramics, china clay, enzymes etc.

Flash dryers are used for drying of wet cakes which are sensitive to heat. There are different variations of flash dryers available depending upon the need to disperse the wet cake or pastes. These are:

Spin Flash Dryers: This consists of a horizontal agitator, which disperses the feed while it comes in contact with the hot air and gets dried.

Cage Mill Flash Dryers: This consists of a vertical pin type rotary and stationary cages. The wet feed is fed at the center of the rotating cage, where it comes in contact with hot air. The rotating cage disperses the feed while drying.

Due to very low residence time in the range of 0.5 to 2 seconds in the flash dryers, heat sensitive products can be easily dried without degradation.

Particle size of the final product can be controlled by installing a particle size controller which recycles the larger particle size back to the agitator and allows only the pre-determined size particles to be discharged as product.

Capacity : We can offer the flash dryers having capacities of 10kg/hr to 50000kg/hr product rate.

Typical applications of flash dryer are starch, bagasse, minerals, pigments and dyes, phosphates, etc.

Rotary dryers are used for drying wet powders and cakes, which are easily breakable and dispersible. The rotary dryer consists of a rotating drum with angle lifting blades which lift the feed as the drum rotates and showers it in the stream of hot air flowing through the drum.

The rotary dryers can be used as calciners using direct or indirect firing.

GMP plants are offered for pharmaceutical, food, and biochemical applications.

Capacity : We can offer the rotary dryers with capacity range from 100kg/hr to 50000kg/hr product rate and operating temperatures up to 600°C.

Typical applications of rotary dryers include silica sand, bagasse, minerals, coconut powder, etc.

The process air is supplied to the bed through a special perforated distributor plate and flows through the bed of solids at a velocity sufficient to support the weight of particles in a fluidized state. Bubbles form and collapse within the fluidized bed of material, promoting intense particle movement. In this state, the solids behave like a free flowing boiling liquid

• Advanced method of drying wet/semi wet solids
• Unlike in Tray Drying every solid particle is floating in the HOT STREAM of Air which is blown from down to up creating material layer in fluidised state
• Almost every wet particle directly receives the heat energy from hot Air resulting in uniform and quick drying

Features of RAJ Continuous Fluid Bed Dryers:

• Very versatile process equipment for uniform and efficient drying of products.
• Fully automatic operation based on PLC control / without PLC control
• Minimum handling and more hygienic
• Lifting & tilting device of product container for easy handling
• Option - steam heated or electric heated blower
• cGMP model with documentation as option.

Material of Construction : AISI 304 / AISI 316 / Custom made.

Accessories : Heat recovery unit can be incorporated, cyclone, bag filters, multiclones, wet scrubber

Applications :
Chemical / Fertilizer / Food - salt, sugar / Mineral - Sand, Aluminum / Ore calcining / Metal oxidation / Sludge Incineration / Pyrolysis of Plastic Waste / Pigment etc.

Capacity available from 5 kg/hr to 2000 kg/hr water/solvent evaporation.

The wet feed is continuously agitated by the heated rotating blades, thus exposing new areas to heating surfaces. This results in the moisture boiling off and rendering the material to dry to the required degree.

Features of RAJ Paddle Dryer:

• Low running cost – contact dryer.
• Continuous production machine without human touch.
• Ideal for solvent recovery.
• Suitable for Crystalline material.
• On-line particle size reduction – no separate pulverizer required.
• Factory assembled & tested.
• Compact construction – less floor area.
• Choice of heating medium – steam, hot water.
• Minimum exhaust air quantity – no elaborate air cleaning equipment needed.
• Absence of high speed rotating parts – less breakdowns.
• Special paddle form – ploughing and self cleaning action.
• Initial particle size is maintained.

Typical Applications

• Crystaline Solids
• Pasty Solids
• Sludge
• Agro Waste
• Magnesium Carbonate
• Polypropylene Beads