The invention discloses a device and a method for dehydrating heavy
sump oil, which belongs to the technical field of
petrochemical wastewater treatment. The method has the characterized by comprising the following steps of leading out
sump oil in a tank area and entering the
sump oil into a Y-shaped filter; filtering, boosting via a
booster pump, and then entering the sump oil into a steam
heat exchanger (1), and heating to 80-130 DEG C; then introducing the sump oil in a vortex dehydrator (2), and separating the sump oil into a low-water-content sump
oil phase and a low-oil-content
sewage phase, and entering the low-water-content sump
oil phase into a coalescence dehydrator (4), further dehydrating to obtain low-water-content oil, and leading the low-water-content oil out of the device, and meanwhile, entering the low-oil-content
sewage phase into a vortex oil remover (3), separating the low-oil-content
sewage phase into a high-water-content sump
oil phase and a sewage phase, discharging the sewage phase, and cyclically performing a
dehydration treatment on the high-water-content sump oil phase. According to the device and the method, the continuous performance of
dehydration for heavy sump oil is realized, deep
dehydration and deep oil removal are performed simultaneously, and non-thorough parts can be cyclically dehydrated and separated; the device and the method are low in
energy consumption, convenient to operate, high in dehydration rate, strong in adaptability to heavy sump oil with various water contents and
dirt contents, and suitable for performing a long-term treatment on a large amount of heavy sump oil.