Alfa 4000 FGDMV/FGDL sawdust dryer











≈ €402,700
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Dryer ALFA 4000 FGDMV/FGDL
Semi-pneumatic drum dryer designed for processing wood waste and chips according to the following data:
Using a gas burner (natural gas as fuel)
• Feed capacity: 17,500 kg/h
• Initial moisture content: up to 52%
• Final moisture content: 12%
• Water vapor: 7,955 kg/h
• Required thermal power: 7,310,023 kcal/h (8.50 MW)
• Fully dried product: 9,545 kg/h
• Natural gas consumption: 860 m³/h
• Total power: 210 kW
Using a furnace for burning wood waste (dry wood residues as fuel)
• Feed capacity: 17,500 kg/h
• Initial moisture content: 52%
• Final moisture content: 12%
• Water vapor: 7,955 kg/h
• Required thermal power: 7,310,023 kcal/h (8.50 MW)
• Fully dried product: 9,545 kg/h
• Wood waste consumption for furnace: 2,284 kg/h
• Net dried product weight: 7,261 kg/h
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DRYER UNIT DESCRIPTION ALFA 4000 FGDMV / FGDL
Part A
• Special wood-fired furnace 8000, capacity 8,000,000 kcal/h, design:
o Solid steel construction lined with high-alumina refractory concrete
o Steel base filled with refractory concrete
o Outer cooling jacket with thermal insulation
o Hot gases connected to the drum body through insulated aluminum duct
o Secondary blower with electric motor
• Special Autofoco nozzle design with improved screw mechanism angle
o Cast iron receiving hopper with rotary level, geared motor with step variator
o Primary air fan with 12 kW electric motor (IP55F)
o Manufactured of painted carbon steel
Part D — Direct gas heating furnace FGDMV 8000
• Designed for natural gas with:
o Solid combustion chamber in steel construction with mineral wool insulation, covered with aluminum sheet
o Modulating gas burner with output range ~600,000 kcal/h to 8,000,000 kcal/h
o Main pressure stabilizer
o Safety and regulating valves
o Min/max pressure stabilizers
o Process and safety stabilizers
o Flame formation device
o Central control box with modulated output
o Electronic indicator with sensitive measuring probe
o Main switchboard
o Multi-package inlet air filter
o Electric motor 8 kW (IP55F)
Supporting Frame
• High-strength welded steel frame with cross beams and reinforcement, painted carbon steel
Drum Cylinder
• Consists of three coaxial elements of thick iron sheets with mixed blades
• Flanged end plate with inspection ports
• Support rings of shaped steel
• 4 large diameter support rollers with heat treatment and steel shafts
• 2 cylindrical bearings per roller
• Group drive with epicyclic gear reducer in cast iron housing, oil-filled
• Gear, roller chain, belts and pulleys, electric motor 30 kW (IP55)
Part E — High-efficiency Fan
• Sheet iron winding
• Statistically and dynamically balanced steel shaft on ball bearings
• Equipped with belts, pulleys, air damper
• Electric motor 166 kW (IP55), painted carbon steel
Part F — Cyclone Filter Group
• 4 USA 1400 type, high-efficiency distribution channel
Part G — Air Bag RS450
• Shaft with chain drive
• Electric motor 2.2 kW (IP55)
Part H — Discharge Screw from Cyclone Group
• Diameter: 400 mm, length: ~6.5 m
• Complete with electric motor 3 kW (IP55F)
• Painted carbon steel
Automatic Lubrication Line
• 1 electric oil pump
• 2 dosing nozzles
• 1 oil tank (1.8 L capacity)
• 1 level switch
• 2 electronic drip systems supplying oil every 8–12 seconds
• Connecting pipes
Part L — Main Electrical Cabinet
• Dust-protected enclosure equipped with:
o Power switch for motors
o 2 local thermometers
o 3 electronic regulators (OMRON) with rods (4–20 mA)
o 2 spark detectors (GRECON)
o Push buttons, signal lamp, solenoid valve
o Siemens S7-200 PLC with color touch screen operator panel
o Internal wiring distribution board
o Danfoss frequency inverter