Software for Design of Separators

Gas-Liquid-Separators

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Fundamentals

Demands

The separators can be adjusted to their tasks and optimized in size by adding internals.

  • Amount of gas / liquid
  • Diameter of limiting droplet
  • Separation efficiency
  • Hold-up time of liquid phase
  • Size of nozzle
  • Inlet distributor
  • Anti-vortex baffle
  • Demisters
  • Determination of flow type at inlet to avoid unfavourable flow patterns

 

Horizontal Gravity separator (HSA)

Vertical Gravity Separators (VSA)

Every gas liquid separator is divided into a gas zone and a liquid zone. Both zones fulfill different tasks.

Product Inlet

The flow type of the incoming product determines the liquid load of the gas phase. This should be taken into account for selecting the piping diameter of the feeding pipe. For higher inlet streams inlet distributors might be required.

Gas zone

In the gas zone, the separation of the liquid droplets to the liquid phase takes place. The gas velocity determines the required area and therefore the diameter of a vertical separator (VSA) or the height and settle length of a segment of a horizontal separator (HSA).

The gas velocity is determined by the limiting droplet size, which can be larger with a demister. This leads to smaller vessels.

Liquid Zone

The liquid zone collects the total amount of liquid from the feed. Control technological and process tech-nological reasons determine the volume of the liquid.

Separator Geometry

Separation takes part in the gas zone. The separation is characterized by the flow area and the flow length, which determine - with or without demister - the separation efficiency for a limiting droplet.

The liquid zone is divided into four levels. In-between those levels there are the hold-up times.

Level

 

Meaning

Emergency
(shut-down)

ELL

Shut down of downstream devices (e.g. compressors) which can be destroyed or malfunctioning by an increased liquid fraction.

High (Alarm)

HLL

Maximum allowed level without decrease in separation efficiency

Normal

NLL

Determines the hold up time of the liquid phase until LLL

Low

LLL

Prevents a gas entrainment into liquid draw-off. Dependent on the ar-rangement of the anti-vortex baffles.

Calculation features

The program allows you to choose from different construction types to determine the most economical separator. You can design new separators or simulate existing separators. The parameter study feature of the ATLAS program system lets you get a feel for the influence of the different parameters on your separator.

Well-known calculation approaches are used for the following procedures:

Vertical or horizontal gas liquid separators can be designed:

VSA module

Vertical Gravity Separators

HSA module

Horizontal Gravity Separators

Determination of diameter with VSA

Determination of diameter with HSA

without demister

The settle length and the limiting droplet size determine the required free area above high level (HLL).

with demister

Settle length and gas area (Ag) may be decreased according demister separation efficiency

without demister

 

with demister

The required diameter D is determined by the limiting droplet size

The velocity in the gas zone can be increased according the demister separation efficiency (FLD module)

LOMA module

Determination of the flow type in the Lockhart-Martinelli-Diagram

The module calculates all necessary parameters according to VDI and it determines the type of two-phase flow. The position of the actual two-phase flow is displayed in the flow types chart (Lockhart-Martinelli-Diagram).

With this additional module, the results of the HSA/VSA module can be used and the flow type in the inlet nozzle of the sepa-rator can be determined. The flow type has influence on the separation efficiency. Slug or bubble flow should be avoided.

Prices

 
Program Single price* Package price* Package price*
VSA 510,- EUR

 

 

999,- EUR

 

 

 

1.500,- EUR

HSA 510,- EUR
LOMA 360,- EUR
FLD 620,- EUR

*Net prices plus VAT

Literature

  1. Harlemann „Selective Withdrawal from a vertically Stratified Fluid"
    Intern. Assoc. Hydro. Research
  2. Patterson „ Experimental Investigation of Critical Submergence for Vortexing in a vertical Cylindrical Tank"
    University of Southern California
  3. VDI-Wärmeatlas / Strömungsformen für Zweiphasen-Strömung
  4. R. Marr und F. Moser „Verfahrenstechnik 9" (1975) Nr. 8, S. 379/382
  5. A.Bürkholz, Droplet Separation, VCH. 1989

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