Process description
The EPCON* CFU is a vertical pressure vessel acting as a 3-phase water/ oil/ gas separator. Centrifugal forces and gas-flotation contribute to enhance the oil/ water separation process. Oil droplets are coalesced into larger agglomerates during the transport through the vessel.
Figure 1 shows a typical process diagram of two CFUs when operated in series. They can be operated in series or parallel depending on the performance needed in a specific application.
Figure 1. Typical process flow diagram of two EPCON CFUs (CFU A and CFU B) operated in series.
Typically, the reject (10 -80% oil) is approximately 1 % of the total flow. Treated water exits the vessels at the bottom outlet for discharge to sea or to the downstream system. When limited or no gas is available in the produced water, gas can be added to enhance the flotation process. If the water contains only very small oil droplets, a flocculant can be used to aid the separation process. The process has the flexibility to dose gas and flocculant on each step in the process.
Figure 2 illustrates a typical set up of a two step CFU system operated in series with sampling points in, out of CFU1 and CFU2.
Figure 2. Flow diagram of two EPCON CFUs when operated in series. S = sampling points. The Flocculant and gas injection points are optional in some applications
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