The decanter centrifuge is a machine that extracts solid materials from liquids. It’s used in a wide range of industrial applications including food processing, fish processing, chemical manufacturing, and wastewater treatment. The decanter centrifuge allows rapid and efficient production by using centrifugal force, which can be up to 4,000 times the force of gravity. The decanter centrifuge is also able to separate two liquids that differ in density. The typical life of a new decanter centrifuge from a reputable manufacturer is 20+ years. Its life can be extended if properly cared for and maintained. The two most important considerations when buying new or used decanter centrifuges are cost and delivery time.
The main technical components of a decanter centrifuge are the screw conveyor and the rotating bowl. Although the screw conveyor and decanter bowl rotate in the same direction, the conveyer rotates at a lower speed. This causes the solids that are pressed outward against the rotating wall to be pushed by the screw conveyor toward the conical end of the bowl. At the conical end of the bowl, solids are ploughed through discharge openings. To avoid contact with solids, the clarified liquid is discharged through a specific outlet usually at the opposite end of the bowl.
When purchasing a used decanter centrifuge, consider the manufacturer, material of construction,capacity and history of use. Reliable manufacturers of decanter centrifuges include Alfa-Laval, Flottweg, Bird and Westfalia. These brands have similar applications.
When choosing a decanter centrifuge, ensure wetted parts (where the product comes in contact with the machine) are made of high quality stainless steel. If in the food industry, be aware that polished stainless steel prevents the buildup of bacteria. If working with chemical applications, select corrosion resistant metals such as titanium or hastelloy.
There are several capacities to consider when purchasing a decanter centrifuge. The first is the feed capacity, which is the volume of product the centrifuge can process per minute. This can range from 5 GMP (gallons per minute) to 1000 GMP depending on the make and model. Another capacity is the motor for bowl drive that can range from 25 HP to 300 HP subject to make and model. There are also differences in dimensions if space is limited.
When purchasing a used decanter centrifuge, ask about its prior application. A food processor won’t want a centrifuge previously used in processing corrosive and hazardous materials. To ensure the highest quality of machinery, choose a reputable and knowledgeable vendor. Used vendors offer the advantages of immediate installation and competitive pricing.
Perry Videx has one of the largest inventories of used decanter centrifuges in the world. Its used machinery spans many industries and includes reconditioned and used decanter centrifuges.