Used Alfa Laval ALDEC G2-70 Denmark

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Introduction

The Alfa Laval ALDEC G2-70 is the second-generation ALDEC G2 series horizontal screw decanter centrifuge, which focuses on continuous solid-liquid separation. Compared with its predecessor, it has significantly improved in processing efficiency, energy consumption and maintenance convenience. It is suitable for high-solid-content suspensions such as municipal sludge and industrial wastewater.

Specification

Item	Value / Description
Type	ALDEC G2-70
Bowl Diameter (Internal)	450/258 mm (two-stage)
Max. Bowl Speed	3100 rpm (Separation factor ≈2800 G)
Temperature Range	0~100 °C
Solid-Phase Adaptation	0.5~5 mm particles, 1%~40% concentration, density ≤1.2 kg/dm³
Main Driving Power	11~22 kW
Differential Driving Power	5.5~11 kW
Bowl Material	2205 duplex stainless steel
Size / Weight	Length≈3998 mm, Width≈990 mm, Height≈1304 mm; Weight≈2300 kg

Working Principle

Feeding: The suspension enters the drum and rotates at high speed with the drum, forming a centrifugal force field.

Separation: Under approximately 2800 G of centrifugal force, the solid phase is thrown to the drum wall to form a deposit layer, while the liquid phase remains in the central area.

Discharge: The screw pushes the solid phase to the conical end discharge port at a speed slightly lower than that of the drum; the liquid phase continuously overflows from the cylindrical end overflow port, achieving continuous solid-liquid separation.

Core advantages

Lower energy consumption: Approximately 30% more energy-efficient compared to the previous generation, suitable for various working conditions.
User-friendly maintenance: EasyLift hood, FlightGuard wear-resistant protection, extending maintenance intervals.
Intelligent control: PLC system can adjust speed, differential speed, and feeding volume, supporting CIP online cleaning.

Maintenance Cycle (Classification)	Maintenance Level Cycle (Whichever Comes First)	Core Content
Daily	Daily / Per Shift	Vibration, temperature and leakage inspection; wash the rotating drum / discharge port
Weekly / Monthly	Weekly / Monthly / Every Month	Clean residual materials and check oil level; lubricate main bearing every 300 h
Half-Yearly	6 Months / 1000 h	Adjust belt tension, check gearbox oil and tighten circumferential bolts
Annual	1 Year / 4000 h	Inspect rotating drum / screw wear, seals and perform dynamic balancing
Medium Overhaul	2 Years / 8000 h	Replace main bearing, screw bearing and seals
In-Depth Overhaul	3 Years / 12000 h	Complete machine disassembly and inspection, replace rotating drum bolts and repair screw
Belt Replacement	16000 h	Mandatory replacement of motor V-belt