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CENTRIFUGAL SEPARATION

Centrifugal Separation is the most widely used method for separating fluids with different densities. It is also used in separating solids from liquids or solids from gasses. To-date , commercially available separators utilizing centrifugal force for separation fall in one of two categories,

Rotary Centrifuges or Hydrocyclones

 
Yaz-Dehydrone is a centrifugal separator that is neither a Rotary Centrifuge nor a Hydrocyclone. Yaz- Dehydrone employs a new method of Centrifugal separation by means of Helical motion. To understand the advantages of this new patented technology, a brief description of each of the following methods is discussed.

1- Centrifuge ( circular motion )

2- Hydrocyclone ( vortical motion , whirlpool )

3- Yaz- Dehydrone ( helical - spiral motion )

 

The following is a simplified description of each of the above methods,

1- Centrifuges ( circular motion )

In Centrifuges the centrifugal force is mechanically generated by turning the equipment containing the fluid in a circular path causing the fluids to separate. This method has been used in the laboratories and primitive industries for over a century. It has mainly been used to separate fluids in static state, i.e. ,specific volumes which needed to be separated. When the volume was large or it was in a dynamic state , i.e., flowing, centrifuges were not capable to deal with the situation. Relatively recently , however, new equipment were designed to deal with such conditions. Please refer to manufacturer’s sites for more information on these equipment
2- Hydrocyclones ( vortical motion )
When the need for separating fluids in dynamic state arisen and before dynamic state centrifuges were introduced in the market, Hydrocyclones were designed. These equipment , which come in various shapes and designs, operate by creating a physical vortex within a cylindrical vessel generating centrifugal force for separation. The heavier phase is forced to the outside portion of the fluid and the lighter fluid stays in the inside as a core. As the fluid continues flowing, the separated portions are directed to different outlets.
Hydrocyclones are continuously introduced into the market as improvements or new designs. They , however, all operate on the same principle, but differ in the way the fluid is forced to go into vortical motion within the equipment.
Hydrocyclones come as conical or cylindrical tubes. Some use tangential entrance of the fluid to force it into vortex, others use devices such as impellers or other turning devices to turn the fluid around itself.
All Hydrocyclonens are limited in their capacity and efficiency.
Because of the restriction in their diameters , which their designs dictate, they are used in batteries in order to deal with large volumes of fluids. This, however, sometimes restrict their uses because of the base area they occupy or make them too expensive to purchase for any specific use.
3- Yaz- Dehydrone
In Yaz- Dehydrone, centrifugal force is generated by flowing the fluid through a helical ( spiral ) pipe. As the fluid travels through the spiral pipe, centrifugal force is generated which induces separation. The heavier fluid travels on the outside portion of the flow and the lighter fluid remains on the inside ( Fig. 3 ). At precisely located outlets the heavier phase is discharged and the lighter phase continues to flow ( Fig. 4 ).
Centrifugal Separators, as a group , have many advantages over other separation methods, such as filtration , settling or decanting, because of the effectiveness and speed of centrifugal force in the separation process and the volume they can handle in relatively shorter time. Yaz- Dehydrone, as a centrifugal separator, has several advantages over all other groups of centrifugal separators. These advantages are,
- Lowest in manufacturing cost
- Separation quality superior to Hydrocyclones
- Separation quality matching or surpassing Centrifuges
- Unique ability to handle continually fluctuating oil/ water ratios, without any interruptions or change in end results
- Unique ability for the same unit to handle a large ratio of oil/ water mixtures
- Handle more volume in less equipment base area
- Lowest in operation and maintenance cost.
- Unique in handling mixtures of liquids or liquids and solids or liquids and gasses or solids and gasses , which none of the other centrifugal equipment can do all (Fig.5 ).
Table 1 and 2 show a comparison between Yaz- Dehydrone and other centrifugal separators
 

Table 1

Yaz-Dehydrone vs. Centrifuges and Hydrocyclones
( For Oil in Water and Water in Oil Separation )
Feed Properties
 Yaz-Dehydrone
 Centrifuges
 Hydrocyclones
Constant Flow+/-10%
 Yes
 Yes
 No
Fluctuating Flow
  Yes
  Yes
  No
Constant Oil Concentration
 Yes
 Yes
 Yes
Varying Oil Concentration
 Yes
Yes
No
Low Oil Concentration
 Yes
Yes
Yes
High Oil Concentration
 Yes
 Yes
 No
Oil Droplets <25 um
 Yes
Yes
No
Oil Droplets >25um
 Yes
Yes
Yes
 
 
 

Table 2

Other Features
( For Oil in Water and Water in Oil Separation )
Feed Properties
Yaz- Dehydrone
Centrifuges
Hydrocyclone
Liquid in Gas
 Yes
 No
 No
Solid in Gas
  Yes
 No
 No
Oil in Water
 Yes
 Yes
 Yes
Water in Oil
 Yes
 Yes
No
Solid in Liquid
 Yes
Yes
Yes
 
 
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