Rotary Dryer

Rotary Dryers / Coolers are widely used in the Industry for drying / cooling of reasonably free flowing materials.

AVM offers Customized Rotary Drying Systems with variety of Configurations.

The rotary dryers comprise of a rotating shell which is supported on tyres or rollers. Suitable drive management is made to rotate the dryers. There are two stationary hood at both the ends, one for letting the air or gas and the other to collect the cooling media. Suitable feeding mechanism is used to admit the feed. The feeding mechanism is governed by screw feeder or chute. The rotating shell in these rotary drying systems is provided with specially designed material showering mechanism like Lifters / Garland Chains etc. The forward movement of the material towards discharge end is provided by the shell inclination & rotating speed. The heat transfer within the shell is responsible for drying of the showering material.Product is discharged from the stationary hood through suitable equipment like Flap Valve / Rotary Valve / Screw Conveyor / Chute.

Air Flow Configurations:

• Co-Current Flow.
• Counter-Current Flow.

Air Heating System Configurations :

• Direct Fired / Indirect Fired Air Heaters: using Liquid / Gaseous Fuels.
• Direct / Indirect Fired Air Heaters: using Solid Fuels, Agro Waste, Saw Dust, Rice Husk, Coal, Briquette etc.
• Indirect Air Heaters: Using Steam / Hot Oil / Thermic Fluid.
• Electric Air Heaters: using electricity.

Product / Fines Recovery System Configurations:

• Cyclone Separators: Mono, Twin, Quadruple, Multi etc.
• Bag Filters: Reverse Pulsejet, Mechanical shaking etc.
• Wet Scrubbers: Direct Contact Ventury, Adjustable Ventury, Packed scrubbers etc.

Optional Features Configurations:

• Feed material conditioning.
• Back mixing of product with feed material.
• Pneumatic conveying system and finish product handling.
• Computerized control system through PLC / DCS & SCADA.

In-Direct Rotary Dryers:
Direct contact is avoided for the material to be dried in the drying media. Two concentric rotating shells are used to comprise the rotary dryers. The rollers or tyres on which the shells rest are driven by suitable drive management. Suitable feeding mechanism is resorted to let the feed admitted. The feeding mechanism is governed by screw feeder or flap valve. The inner shell lets the drying media to enter and travel toward the discharge end and again it move back to the point of origin. Suitable radial lifters are provided to the inner shell. This special construct is used to shower the feed material. Shell inclination & rotating speed facilitate forward movement of the material towards discharge end providing required residence time. Heat transfer makes the feed material to dry owing to the special construct of the passage. The stationary hood is used to discharge the product through suitable equipment.

Air Heating System Configurations:

• Direct Fired Air Heaters: using Liquid / Gaseous Fuels.
• Direct Fired Air Heaters: using Solid Fuels, Agro Waste, Saw Dust, Rice Husk, Coal, Briquette etc.

Product / Fines Recovery System Configurations:

• Cyclone Separators: Mono, Twin, Quadruple, Multi etc.
• Bag Filters: Reverse Pulsejet, Mechanical shaking etc.
• Wet Scrubbers: Direct Contact Ventury, Adjustable Ventury, Packed scrubbers etc.

Optional Features Configurations:

• Feed material conditioning.
• Back-mixing of product with feed material.
• Pneumatic conveying system and finish product handling.
• Computerized control system through PLC / DCS & SCADA.

Rotary Calciners are used to calcine materials at high temperature. The rotary calciner comprises of rotating shell, rollers or tyres, combustion chamber, stationary hood, screw conveyor and many more tools. The rotating shell is supported on rollers and a suitable drive arrangement is provided. The internals are suitably refractory lined to minimize the heat losses. The combustion chamber produces hot gases which are required for calcination. This combustion chamber is connected to stationary hood and the feed material is fed at the controlled rate. The calcined material flow in counter current fashion within the calciner and gets discharged through discharge hood.

Air Heating System Configurations:

• Direct Fired / Indirect Fired Air Heaters: using Liquid / Gaseous Fuels.
• Direct / Indirect Fired Air Heaters: using Solid Fuels, Agro Waste, Saw Dust, Rice Husk, Coal, Briquette etc.

Fines Recovery Options:

• Cyclone Separators – Mono, Twin, Quadruple etc.
• Bag Filters – Reverse Pulsejet, Mechanical shaking etc.

Optional Features:

• Pulverising of Feed / Product
• Feed Material Pre-Heating Arrangement.
• Rotary Cooler for cooling of calcined product.
• Pneumatic conveying systems for feed material and finish product handling.
• Computerized control system through PLC / DCS & SCADA.

Tunnel dryers and tunnel drying systems are perfect machines for drying of Granulated / Extruded / Briquettes / Flakes / Fibrous / Pre Formed materials. There are numerous applications of tunnel dryers including Ceramic Fiber Papers, Ceramic Fiber Boards, Molded Paper Products, Rayon Staple, Cotton linters, Noodles, Food products etc.

AVM offers Customized Tunnel Drying Systems with variety of Configurations.

Operation Configurations:

• Continuous / Semi-continuous/ Batch
• Single Pass / Multi Pass
• Single / Multi Temperature & Airflow Controlled Zones
• Once through / Re-circulating air modules--

Air Flow Patterns Configurations:

• Parallel Flow
• Counter-current Flow
• Cross Flow
• Combination Flow
• Through Circulation

Material Movement Configurations:

• Continuous on Metallic Mesh Belt Conveyor
• Continuous on chain mounted Moving Trays / Pallets
• Semi-Continuous on Carts / Trolleys
• Batch on Trays / Trolleys / Pallets

Air Heating System Configurations :

• Direct Fired / Indirect Fired Air Heaters: using Liquid / Gaseous Fuels.
• Direct / Indirect Fired Air Heaters: using Solid Fuels, Agro Waste, Saw Dust, Rice Husk, Coal, Briquette etc.
• Indirect Air Heaters: Using Steam / Hot Oil / Thermic Fluid
• Electric Air Heaters: using electricity.

A variety of machines(industrial conduction dryers) like tube bundle dryers, rotatory speed dryers, rotor type dryers are used in diverse industries and can be tailored to meet the client's requirement.

In this dryer, tube bundle is rotating inside stationary housing.

In tube bundle dryers, the tube bundle rotates inside stationary housing. The material to be heated is passed through the tubes of tube bundle. The heated material is then fed into the stationary dryer housing at suitable location at one end. Conduction as a means of heat transfer takes place when the material is lifted up by the lifters. The lifters are provided on the periphery of the tube bundle.

AVM offers customized configurations of Tube Bundle Dryers.

• Material Flow: Co-current / Counter-current.
• Vapor Exhaust: Natural Draft / Induced Draft.
• Fines Recovery: Cyclones / Bag Filters / Settling Chambers.
• Heating Media: Steam / Hot Oil / Thermic Fluid.
• Feed preconditioning, Product back-mixing systems.
• Feed & product handling, conveying systems.

In this dryer, the outer shell housing is the fixing point of the tubes and is rotated along with the shell. The circumference of the internal periphery of rotary shell contains the single/multiple rows. Tyres or rollers support the rotary shell and a suitable drive arrangement unit is provided. The feed screw feeds the feed material through the center of one end of the dryer. The circumferential tubes accumulate the steam from a rotating manifold installed towards material discharge end of the shell through Rotary Joint. Condensate is also collected through the same Rotary Joint. The accumulated material gets dried up and is discharged through the other end. The openings serve the dual purpose. It lets fresh air to get into. The vapors are disposed from the feed end. Spiral flight lifters showered the feed material on tubes.

AVM offers customized configurations of Rotary Steam Tube Dryers.

• Vapor Exhaust: Natural Draft / Induced Draft.
• Fines Recovery: Cyclones / Bag Filters / Settling Chambers.
• Heating Media: Steam / Hot Oil / Thermic Fluid.
• Feed preconditioning, Product back-mixing systems.
• Feed & product handling, conveying systems.

AVM offers custom tailored Agitated rotor dryers. Heat is supplied to jacket of stationary cylindrical housing when used as dryer/ heater. Specially designed rotor is used to put the material to be dried in agitation. Rotor is specifically configured depending on material characteristics and can be Screw / Ribbon / Paddle / Plough / Anchor / Special Type etc. The heating media can be steam, hot oil, hot water or thermic fluid. Provision for solvent recovery option is also provided. Suitable cooling media can be circulated in the jacket when used as a cooler.

Vacuum dryers find extensive usage in the industry for drying a variety of products. These vacuum dryers are perfect to dry heat sensitive products, drying of products in solvents, drying requirements necessitating achievement of very low moisture or low oxygen drying environment in order to optimize oxidation or for explosion prone products. AVM offers custom tailored vacuum drying systems with variety of configurations.

AVM offers Customized Vacuum Drying Systems with variety of Configurations.

In order to dry the material, the material is kept in agitation by means of specially designed rotor. Then the heat is supplied to jacket of stationary cylindrical housing.

Features Configurations:

• Rotor Types: Helical Ribbon, Paddles, and Special.
• Heating Surfaces: Shell, End Covers, and Shaft.
• Heating Media: Steam, Hot Water/Oil, Thermic Fluid.
• Side Mounted Choppers.
• Solvent Recovery.

In these dryers, the rotating jacket has double conical shape where the heat is supplied. Continuous tumbling within the rotating house is used to keep the material dried. The special conical shape drains out the material at the end of the batch.

Features Configurations:

• Heating Media: Steam, Hot Water/Oil, Thermic Fluid.
• Side Mounted Choppers.
• Solvent Recovery.

Rotary atomizers are used in spray drying to atomize the feed into fine droplets. Kinetic energy is imparted to the rotary atomizers for atomization of the liquid. The kinetic energy is harnessed from the rotating wheel. The pattern of the droplets of atomized liquid depends upon several factors like liquid properties, disc speed, disc configuration etc. Bulk density of the liquid is also one of the factors for spray dried products. Different atomizer wheel configurations, optimum atomizer speed and optimum relevant feed properties yield desired results.

AVM offers following models of Rotary Atomizers.

Model No	Wheel Diameter	Water Feed Rate	Connected Power
Model RDA-060	60 mm	20 ltr/h.	0.37 kW
Model RDA-100	100 mm	60 ltr/h.	1.10 kW
Model RDA-115	115 mm	120 ltr/h.	2.20 kW
Model RDA-160	160 mm	750 ltr/h.	5.50 kW
Model RDA-210	210 mm	1500 ltr/h.	11.00 kW
Model RDA-250	250 mm	3000 ltr/h.	37.50 kW
Model RDA-300	300 mm	4500 ltr/h.	45.00 kW
Model RDA-350	350 mm	10000 ltr/h.	75.00 kW
Model RDA-400	400 mm	12000 ltr/h.	110.00 kW

Wheel Configurations: Standard wheel with radial openings, Pin wheel, Curved Vane Wheel, Slotted wheel, Non String Forming Wheel, Umbrella type Wheel etc.

Lubrication System Options : Gravitational Wick Lubrication. / Forced Lubrication

Optional Features: Speed Indication, Vibration Monitoring, Steam sparging.

For industrial drying units New AVM Systech offers custom tailored auxiliary systems. The wide spectrum of such equipment include Air Heaters / Gas Heaters / Hot Air Generator Systems; Exhaust Emission / Pollution Control / Fines Recovery Systems; and Material Handling / Feed & Product Conditioning / Cip Systems. These are custom tailored to meet the client's need and are in accordance with industrial safety and pollution standards. Different types of auxiliaries are manufactured in compatible configurations.

AVM offers wide range of customized Heating Systems with variety of Configurations.

Types of Indirect Heated Air / Gas Heating Systems offered:

• Multiple Concentric Shells Type.
• Shell & Tube Type.
• Multi - Coils in Shell Type.
• External Recuperator Type.
• Tube Bundle over Combustor Bed.
• Finned Tube Type Air Heater

Types of Direct Fired Air / Gas Heating Systems Offered:

• Single Shell Combustion Chamber.
• F.B. Combustor.
• Multiple Concentric Shell all metal construction (Without Refractory Lining)
• Concentric Shell Type With Refractory Lining
• Duct Mounted.

Operating Capacities of Heating Systems:

• Air Flow Rates up to 150,000 Nm³/hr. Higher flow rates can also be offered.
• Heated Air Temperatures up to 690 °C for Indirect Type.
• Heated Air Temperatures up to 1500 °C for Direct Fired Type.

Types of Fuels / Heating Media for Heating Systems:

• Liquid Fuels: HSD, Light Oil, Heavy Oil, SKO etc.
• Gaseous Fuels: LNG, CNG, Propone, LPG, Producer Gas, Bio Gas etc.
• Solid Fuels: Bio-waste, Saw Dust, Wood Chips, Coal, Rice Husk, Briquettes etc.
• Heating Media: Steam, Hot Oil, Thermic Fluid, Electricity etc.

AVM offers customized Systems exhaust emission / pollution control / fines recovery systems with variety of Configurations.

Bag Filters / Dust Collection Systems:
AVM offers Reverse Pulse Jet type Bag Filters for Industrial applications in several customized configurations.

• Pulsing Configurations: On-Line Pulsing, Modular Off-Line Pulsing.
• Flow Rates: As per system requirement.
• Operating Temperature Range: Up to 260°C.
• Housing Type: Cylindrical Housing, Rectangular Housing.
• Air Entry Configurations: Hopper entry with side / central distribution, Tangential entry.
• Plenum Configurations: Top Access, Walk through etc.
• Electrical heat tracing for bottom hopper.
• Cleaning In Place system ( CIP) for special applications.
• Safety Accessories like Fire fighting system, Explosion vents, Antistatic construction etc.
• Air Ingress system for filter bags protection against temperature surges.

Bag filters with Mechanical shaking arrangement can also be offered.

Cyclone Separators:

• Mono, Twin, Quadruple, Multiple Cyclones depending on system requirement.
• Tangential, Wrap Around Inlet configurations.
• Distributed Inlet & Outlet configurations for Multiple Cyclones.

Wet Scrubbing Systems:

• Direct Contact Spray Type Ventury Scrubbers.
• Droplet Separators.
• Adjustable area ventury type with manual / automated adjustment.
• Scrubbers with tower packing, saddle packing, demister mesh packings

AVM offers customized Systems with variety of Configurations.

Blenders / Powder Mixers:

• Equipments configured for Batch or Continuous Operation.
• Capacities as per system requirements.
• Paddle Type Blenders.
• Ribbon Type Blenders.
• Special Rotor Type Blendors.
• Double Cone Blenders.
• Double Shaft Paddle Mixers.
• Online Product Blenders with controlled liquid dosing as per system requirements.

Liquid Feed / Slurry Preparation Systems:

• Agitated Reaction Vessels.
• Vessels with Heating, cooling, sparging mechanism.
• High Speed Blungers.

Material Handling Systems:

• Double Flap Valves: Motorised / Counterweight type.
• Rotary Air Lock Valves : Drop Through / Blow Through type.
• Rotary Feeders.
• Screw Conveyors.
• Pneumatic Conveying Systems: Lean Phase Suction Type.
• Pneumatic Conveying Systems: Lean Phase Positive Pressure Type.

Cleaning In Place ( CIP ) Systems

• Single Tank System / Three Tank System
• A Motor Winch system for large vessels cleaning
• Wall flush nozzles for cleaning OD DUCTING equipment
• Fully automated systems with PLC / DCS & SCADA

'AVM' also undertakes execution of systems for manufacturing of following products, including raw material handling, processing, product finishing & finish product packing sections.

• China Clay.
• Detergents.
• Formulated Agro-chemicals.
• Pulp Molded Products.
• Starch / Starch Derivatives.