FIELD: chemistry.
SUBSTANCE: invention relates to evaporation based zero-liquid discharge method for generation of steam for enhanced oil recovery (EOR) processes utilising once-through steam generators (OTSG). Method includes feeding the OTSG with produced water, vaporizing a fraction of this water for steam injection and blowing down the balance of the water. This water, referred to as OTSG blowdown, can be flashed to produce a vapor stream and a liquid that is fed to a mechanical vapor compression (MVC) evaporative process. Latent energy contained in the vapor stream generated by the upstream flash is beneficially recycled to substantially reduce or eliminate the energy consumption of the MVC process.
EFFECT: invention reduces the loss of liquid during disposal or eliminates the need to recycle liquid by achieving a zero liquid discharge.
25 cl, 11 dwg
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