Oil extraction filtration equipment and filtration method

Abstract

Belonging to the technical field of treatment of contaminated oil, the invention discloses oil extraction filtration equipment and a filtration method. The equipment includes a main tank body, the inside of the main tank body is sequentially provided with an air-water mixer, a conical primary filter, overflow settlers, a floc interceptor, a coalescing separator, a water collecting tank and an oilcollecting tank from the bottom up. The water collecting tank is communicated with a water outlet pipe, the oil collecting tank is communicated with an oil outlet pipe, and an air outlet pipe is disposed above the main tank body. The equipment provided by the invention combines flocculation, air flotation, oxidation, suspension layer filtration, coalescence and filtration into a whole, is equippedwith a floc interception layer, a standby filter and a plurality of overflow settlers, has the characteristics of high treatment efficiency, fast formation of filter layer, strong adaptability, and flexible and stable operation, and is suitable for treatment of various sewage containing suspended matters, is especially suitable for suspension filtration of high salinity and high density oily sewage hardly adaptable by existing similar technologies, also has the advantages of low energy consumption, small land occupation and investment, and low operating cost, thus being suitable for popularization and use.

Description

technical field [0001] The invention belongs to the technical field of dirty oil treatment, and in particular relates to an oil recovery filtering device and a filtering method. Background technique [0002] In the process of oil and natural gas exploration and refining, a large amount of oily sewage is produced, mainly including oil production sewage, drilling, well washing and oil refining sewage, etc. Among them, oil production sewage has the largest amount, in addition to oil, it also contains a large amount of suspended solids. It is an important task to treat these oily sewage, separate and recover oil products, reduce COD, and make them meet environmental protection discharge standards or reinjection. At present, oil fields and refineries usually use some conventional methods of sedimentation, air flotation, coalescence, biochemistry and filtration to treat oily sewage, mainly including regulating tanks and vertical natural oil removal tanks with large floor area. ...

AI Technical Summary

Problems solved by technology

[0003] When the existing filtration equipment is used for the treatment of oily sewage, the separation of various substances cannot achieve excellent results. Often the recovered oil still contains a large number of flocs, or the supernatant of the water layer still contains A large number of compounds; when the existing mainstream filtration equipment is filtering, the sewage passes through the filter layer through natural filtration, there is almost no pressure difference between the two ends of the filter layer, and the filtration efficiency is slow; and the sewage treatment is carried out for a period of time Finally, the filter layer is seriously blocked by suspended solids, making it difficult to continue normal work. The existing self-cleaning method of filter equipment is difficult to clean the suspended solids embedded in the filter layer, which cannot guarantee the normal processing capacity of the filter equipment, and its effective life is not long.

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