Result background:

In recent years, the heavy and inferior crude oil, especially the emulsification problem, has made it more and more difficult to operate electric desalination-distillation units, especially the problem of carrying oil in electric desalination drainage. Almost all domestic refining companies have experienced serious oil-carrying problems in desalinated water from electric desalination units. The direct consequence is that it has greatly increased the difficulty of processing heavy sewage oil in refineries and sewage oil. Rerefining of sewage oil leads to unstable operation of refinery units, and corresponding environmental protection issues have become increasingly prominent. The problem of oil-carrying drainage from electric desalination has become a major problem that needs to be solved urgently for domestic refining enterprises. Desalinated water from electric desalination units has become one of the main sources of sewage and dirty oil in refining enterprises.

Current status:

At present, domestic refining companies still generally use old technologies for sewage treatment. After the desalinated water from the electric desalination device enters the sewage treatment plant, it is processed by sedimentation, oil separation, flotation, biochemical and other technologies together with the sewage from other units. The separated sewage oil is directly sent to the sewage oil tank, after dehydration, and sent to the coking unit. Or injected into the raw oil pipeline for recycling; the salty sewage enters the subsequent unit for further treatment. The device covers a large area, has poor economic benefits, limited processing capacity, and weak impact resistance. When there is more oil in the water, it will cause a great impact on the device and cause great pressure on the storage in the tank farm. In addition, this technology has poor oil-water separation effect, making it difficult to effectively separate desalinated water from electric desalination units. As the blending ratio of heavy and inferior crude oil continues to increase and the emulsification degree of oily sewage increases, the device can no longer meet the requirements of clean production.

Technical advantages:

The experimental results show that it is feasible to use centrifugal extraction and separation method to treat electric desalination sewage. After treatment, the oil content of the sewage reaches the standard, and the separated sewage oil is returned to the inlet of the primary distillation tower for refining, completely solving the problem of heavy sewage oil. This technology can improve the discharge compliance rate of electric desalination sewage and reduce the impact on sewage treatment plants; it can reduce the generation of a large amount of dirty oil, eliminate the storage pressure of dirty oil, and reduce the loss rate of crude oil processing and comprehensive processing costs.

1. It can increase the discharge compliance rate of electric desalination sewage and reduce the impact on sewage treatment plants;

2. It can reduce the generation of a large amount of dirty oil, eliminate the storage pressure of dirty oil, and reduce the loss rate of crude oil processing and comprehensive processing costs.

Application prospects:

Based on the practical needs of environmental management and resource utilization of pollutants, deoiling of discharged sewage by electric desalination has become a research hotspot in the field of petroleum refining today. There is an urgent need to develop an deoiling of electric desalination sewage with high separation efficiency and good effect. method, reduce the pressure on sewage treatment plants, recover crude oil, and improve the competitiveness of my country's refining industry through new technologies that are efficient and energy-saving.