Vacuum Dehydration systems
Oil vacuum dehydration systems have
several filtration steps for removing particulate and vacuum distillation unit
for dehydration.
FV (Vacuum Dehydration) Compared to Other
Technologies
Centrifuge units removes free water only; has difficulty
breaking stable emulsions; larger envelope dimensions but lower flows; higher
initial and operating costs.
Desiccant units have limited water removal capability
due to absorbing material; only removes air ingressed particles; expensive
compared to the volume of water removed. Does not work well in viscous fluids (>100 cSt.)
Coalescer units removes free water only; has difficulty
breaking stable emulsions; does not work well in viscous fluids (>32 cSt.)
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Water
Removal Techniques
|
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Water
Type Removed
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Separator
Type
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Dissolved
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Emulsified
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Free
|
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No
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Some
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Yes
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Gravity
|
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No
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Some
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Yes
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Centrifuge
|
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No
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Some
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Yes
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Coalescing
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Some
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Yes
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Yes
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Desiccant
Filtration
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Yes
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Yes
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Yes
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Vacuum
Distillation
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Factors that affect water extraction Rate
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Properties
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Water
Extraction Rate
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Oil
Temperature
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Strongly
Increased
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Operation
Vacuum (Negative Pressure in Vacuum Tower)
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Increased
|
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Initial
Content of Water
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Increased
|
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Flow
Rate of FV System
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Increased
|
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Oil
Properties
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Viscosity
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Reduced
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Surface
Tension, Detergent Additive
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Reduced
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Air
Humidity
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Reduced
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FV Series