Resource-saving technology for oil electric desalination
48EN
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Process Description Feedstock - pre-degassed and dehydrated oil, is divided into two streams downstream of pump 14. The first stream is heated in heat exchanger 1, the second is mixed with drainage water after first stage using jet pump 4, is heated in heat exchanger 2 and combined with the first stream. Heated degassed oil is separated in separator 5 into salty water and partially desalinated oil, which, using jet pumps 9 and 12, is mixed with part of drainage water from electric dehydrator 6 and balance drainage water from the electric dehydrator 7 and then sent to the electric dehydrator 6. Salty water from separator 5 is cooled in heat exchanger 4 and discharged from the plant. Further, oil is mixed with circulating and balance drainage water from electric dehydrator 7 and 8, respectively, using jet pumps 10 and 13, and sent to electric dehydrator 7. From electric dehydrator 7, partially desalinated oil is mixed using jet pump 11 with circulating drainage water from electric dehydrator 8 and fresh water heated in heat exchanger 3 supplied by pump 15, and sent to electric dehydrator 9, from which desalinated and dehydrated oil is removed.
Process features
Two- or three-fold electric desalination and electric dehydration of pre-degassed and separated oil
Counterflow recycle of saline drain water
Heat recovery of discharge salty water
Reduction of power consumption by 30-40 %
Reduction of fresh water flow rate by 35-55%
Technical Specification
Temperature: 40-110 °C
Pressure: 0,2-0,55 МПа
Capacity of single oil train: up to 400 mg/h
Residual content of chloride salts: not more than 3 mg/dm3
Fresh water flow rate: not more than 2.5% wt%
Patents of the Russian Federation No. 2525984, 2530030