WATER TREATMENT PROCESS FOR RECYCLING PRODUCED WATER FROM HEAVY OIL RECOVERY TO SERVE AS BOILER FEED WATER

摘要

Disclosed is a water treatment process for recycling produced water from heavy oil recovery to serve as boiler feed water. Inlet water containing produced water as the main component is conveyed to a vertical falling-film evaporator equipped with a brine distribution device, so as to produce distilled water as boiler feed water through evaporation. Scrubbing particles are added to the inlet water containing the produced water as the main component or to circulating strong brine of the vertical falling-film evaporator to form slurry. When the slurry is evaporated by the vertical falling-film evaporator, scaling on the heat exchange surface of the evaporator is prevented or reduced by utilizing the solid particles in the slurry. According to the process, most of produced water is processed into high-quality distilled water used for a boiler to produce steam so as to increase the heavy oil recovery rate, and the process can be directly used for treating the produced water, with a recycling rate higher than 95%, to produce the high-quality boiler feed water used for producing the steam required by heavy oil recovery. The process can also be used for treating boiler blow-off, thereby reducing the emission of a factory, lowering the requirements of physicochemical treatment, and increasing the overall water recycling rate of a water treatment plant.