Oct 28

Decanter Centrifuge is important equipment for oil and gas drilling field, especially for solids control and waste management. There are different centrifuge model with different speed. How to match proper centrifuge speed for different projects? This is an important issue.

decanter centrifuge

Question 1: HOW to buy fixed speed centrifuge or variable speed centrifuge?

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Oct 16

Classified by drive mode, Decanting Centrifuge has different models, like hydraulic drive, electric drive and also magnetic drive. Different drive model has different advantages and disadvantages. Hydraulic drive centrifuge can be started very smoothly, with less noise and less friction. But once some problems arise, it is very hard to maintenance. Electric drive is not that smooth when starting, but is easier for maintenance for trouble shooting, so that lead to less cost.

Some remarks:

FHD: Full Hydraulic Drive ; VFD: Variable Frequency Drive;  Magna: Magnetic Drive

VFD control panel for VFD centrifuge

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Jun 03

Generally speaking, decanter centrifuge plays a role in separating solids from liquids. Alfa Laval decanter centrifuge is one of the best sold centrifuges in the world, especially in South America. The other brands in South America market including Derrick, MI-Swaco, NOV, Derrick, GN, etc. GN solids control is new brand player in the market, but fast developing.

decanter centrifuge to Ecuador

decanter centrifuge to Ecuador

How a decanter centrifuge works

A decanter centrifuge separates solids from one or two liquid phases in one single continuous process. This is done using centrifugal forces that can be well beyond 3000 times greater than gravity.

When subject to such forces, the denser solid particles are pressed outwards against the rotating bowl wall, while the less dense liquid phase forms a concentric inner layer. Different dam plates are used to vary the depth of the liquid – the so-called pond – as required.

The sediment formed by the solid particles is continuously removed by the screw conveyor, which rotates at a different speed than the bowl. As a result, the solids are gradually “ploughed” out of the pond and up the conical “beach”.

The centrifugal force compacts the solids and expels the surplus liquid. The dried solids then discharge from the bowl. The clarified liquid phase or phases overflow the dam plates situated at the opposite end of the bowl. Baffles within the centrifuge casing direct the separated phases into the correct flow path and prevent any risk of cross-contamination. The speed of the screw conveyor may be automatically adjusted by use of the variable frequency drive (VFD) in order to adjust to variation in the solids load.

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