Combined automatic purification method of dirty oil and scum and device thereof

Abstract

The invention provides a combined automatic purification method of dirty oil and scum and a device thereof. The method is to carry out combined washing and demulsification and dehydration on the dirty oil and the scum to realize recycle of the dirty oil and the scum. The device consists of a plurality of storage tanks, wherein, a dirty oil washing tank, a scum storage tank, a primary demulsification dehydration tank, a secondary demulsification dehydration tank, a refined oil storage tank are respectively provided with a serpentine heater, and the serpentine heaters are connected with a steam piping network; a pipeline cascading control valve and a metering pump are arranged on the top of the primary demulsification dehydration tank and the secondary demulsification dehydration, and the pipeline cascading control valve and the metering pump are connected; a feed pipe with control valve and a discharge tube with control valve are respectively arranged at the bottom of the dirty oil washing tank, the scum storage tank, the primary demulsification dehydration tank, the secondary demulsification dehydration tank and the refined oil storage tank, and the feed pipe and the discharge tube are respectively in parallel connection with a feed circulating tube and a discharge circulating tube. In the process, waste water recycling is adopted, thus the processing cost is lowered, and the environment is protected; integration design is adopted in each processing tank, thus the occupation space is small, and the equipment manufacturing cost is reduced. The invention has good economic and social benefits.

Description

technical field [0001] The invention relates to a waste oil recovery and treatment technology, in particular to a combined automatic purification method and device for waste oil containing miscellaneous oil and crude oil containing water, oil sludge at the bottom of a tank, or waste oil containing water and miscellaneous impurities in an oil refinery, and scum. Background technique [0002] In the process of crude oil extraction from underground to transportation to refineries, in order to reduce the viscosity of crude oil, oil production units should add a large amount of emulsifier to the oil well. Affinity forms oil-in-water or water-in-oil emulsified crude oil. The low viscosity of emulsified crude oil can not only increase the output of oil well crude oil, but also improve the transportation capacity of the oil pipeline after entering the oil pipeline and reduce the transportation cost. However, after the emulsified crude oil containing a large amount of emulsifier and ...

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Problems solved by technology

In actual production, the above-mentioned various dehydration methods are all used, but the sewage discharged after separation still contains a part of emulsified crude oil with a large water content, a large amount of emulsifier, demulsifier and mechanical impurities, usually called scum and scum Slag or water-containing oil refinery scum generally has an oil content of 1-60%. Since the recovery and treatment of scum in the discharged wastewater is quite difficult, it is generally discharged as wastewater. Therefore, it not only causes serious pollution to the surrounding environment, but also A large amount of valuable waste oil is wasted. At present, there is no good way to solve the recovery and treatment of scum in waste water.

In addition, at the mining site of the oil field, there are crude oil sprayed or scattered during well testing or pipeline laying, and there are tank bottom oil and other waste oil at the bottom of the tank truck. If they are not recycled, it will not only cause environmental damage Pollution also causes a lot of waste of energy, but currently there is no good way to recycle crude oil, tank bottom oil and other forms of dirty oil scum

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