CHEMPURE SOLID BOWL CENTRIFUGE

The Chempure centrifuge is a specially developed Solid-Bowl centrifuge for effective separation of slurries into liquid and solid phases, with the application of centrifugal sedimentation principle.

Solidbowl Centrifuge

How a Solidbowl Works

The centrifuge is fed through a stationary pipe, which is inside a hollow shaft connected to the screw conveyor (scroll). There it enters a feed compartment (inside of the conveyor) and is accelerated through feed ports into the inside of the bowl. Once inside the bowl centrifugal forces accelerate the solids. They are then collected on the inside diameter of the bowl wall and the liquid forms a concentric annulus and fills the bowl to the level of the effluent weirs.

The screw conveyor, which is connected through a spline coupling to a gearbox, turns slightly slower than the bowl. Since it is turning slower and the helix is angled in a manner to remove the settled solids toward the small diameter (conical end) the solids are then conveyed along the inside diameter of the bowl to the solids discharge end.

The liquid flows around the screw conveyor and exits through effluent weirs located on the large diameter (cylinder) end of the bowl. Solids, which do not settle to the inside diameter of the bowl, are carried out with the liquid through the effluent weirs.

Effluent weirs that are adjustable control the amount of liquid inside the bowl. The maximum volume (pool) forms an annulus diameter, which is smaller than the solids discharge diameter. There, the liquid always flows to the cylinder end. We work to continually improve the feed capacity on solidbowl machines.

Salient Features Continuous Solid -Liquid Separation

Solids are continuously separated from the liquid phase by the application of centrifugal force ranging up to 3000 times the force of gravity, efficiently and economically.

The Clarifier Principle:

The Chempure Centrifuge has the characteristics of a clarifier wherein gravity is replaced by centrifugal force-many thousand times greater in effect.

Extremely flexible Separational tool

Applications are wide ranging and encompass:

Flexible Application.
Clarification of liquids.
Dewatering or deliquoring solids.
Thickening or concentration of solids.
Classification of solids suspended in liquid.
Handling a wide size range of solid particles from 5mm down to few microns.
Handling slurries with a solid content from as low as 0.5% to as high as 65% w/w.

Economical Operation

Chempure Centrifuge has polymiser features, wherein the feed zone & conveyor flights are modified to reduce the floc breakage and conveyor turbulence in the pool. These features result in considerably reduced dose of polyelectrolyte. In addition there is economy of space, power and labor required in the decanter.

Stainless Steel Construction

Carbon Steel corrodes, leading to unbalance, high maintenance costs, long downtimes. Therefore the principle elements and stressed rotating components of Chempure Centrifuge are machined from quality centrifugally cast Stainless Steel.

Super Performance

Four crucial factors govern the performance of decanter centrifuges.

Centrifugal force required to sediment the solids.
Clarification necessary to 'capture' the solids,obtained by appropriate setting of the pool depth.
Differentail speed setting, between the bowl and scroll, to convey the solids and obtain appropriately low cake moistures.
Hydrodynamic design to minimise turbulence.

In specifying a Chempure centrifuge, for a particular application, Pennwalt considers other design features such as :

The pitch of the conveyor
Feed zone design
Beach angle
Bowl surface
Abrasion resistance
Material of construction
Sedimentation enhancing features