electrostatic dehydration & desalting - electrostatic crude dehydrator two stage desalting system dehydrators desalters dps delta uk

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ELECTROSTATIC DEHYDRATION & DESALTING

When crude oil is produced it will contain salt which will be present in the water as soluble mineral salts. Therefore the removal of the water will also remove the salt. In some processing applications, such as refining, it may be necessary to desalt in two stages, with the addition of dilution water between the stages.

Typical dilution rates will be in the order of 3-4% of the feedstock flowrate. In some cases, in order to save fresh water, it may be possible to inject seawater with the fresh water into the feedstock to meet the required outlet salt and BS&W specification.

The DPS Delta electrostatic crude dehydrator/ desalter has an innovative design utilising both AC and DC voltage to enhance the coalescence of water droplets.

The DC field between the electrode plates allows a uniform migration of water droplets towards the opposite charged electrode while maintaining an AC field between the water interface and the electrode plates to coalesce the larger droplets near the oil/ water interface.

The droplets passing between the two differently charged electrode plates collide, coalesce and then fall back into the water phase under gravity.

An externally mounted transformer with internal diodes provides a secondary output voltage of 16.5/23.0/ 35 Kv DC to the electrode plates. The transformer has a 100% reactance which will allow, in the event of a water slug in the crude causing a short circuit, for the unit to be kept on line until normal conditions are reinstated.

TYPICAL FLOW SCHEME FOR TWO STAGE DESALTING SYSTEM

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DPS Delta Dehydrators/ Desalters are designed and built to meet the requirements of international codes and standards. We are able to execute projects throughout the world utilising our network of partnerships and joint ventures and in- country offices, thus maximising local content and transfer of technology.