Multi-stage thermal washing and screening method and system for oily sludge-containing impurities

Abstract

The invention relates to a multi-stage thermal washing and screening method and system for oily sludge-containing impurities. According to the method, the oily sludge-containing impurities are screened, and screened undersize materials and oversize materials are subjected to different oil removal treatments. The system comprises a feeding subsystem, a thermal washing and screening subsystem, a centrifugal separation subsystem and an auxiliary subsystem which are connected according to working procedures; the feeding subsystem comprises an impurity screening device; the thermal washing and screening subsystem comprises small-particle material thermal washing equipment and multi-stage screening equipment which are connected in sequence; the centrifugal separation subsystem comprises solid-liquid separation equipment and oil-liquid-solid three-phase separation equipment, and a liquid-phase outlet of the solid-liquid separation equipment is connected with a feeding hole of the oil-liquid-solid three-phase separation equipment; and the auxiliary subsystem comprises large-particle material thermal washing equipment. According to the multi-stage thermal washing and screening method and system, the materials with different sizes in the oily sludge-containing impurities can be screened and classified according to sizes, different oil removal treatments can be respectively carried out, the materials with large surface areas can be cleaned more, the materials with different sizes can be respectively cleaned, the oil content of the discharged materials is ensured to be less than 2%, and sump oil recovery and water cyclic utilization are realized.

Description

technical field [0001] The invention relates to a multi-stage hot washing and screening method and system for oily mud impurities, belonging to the technical field of petrochemical industry. Background technique [0002] Oilfield sludge is mixed with a large amount of domestic and production waste, which increases the difficulty of sludge treatment. At present, there are various technologies for oilfield oil sludge treatment. According to the treatment temperature, they can be roughly divided into low-temperature treatment technology such as hot water washing below 100°C and high-temperature treatment technologies such as pyrolysis and incineration above 400°C. Hot water washing low-temperature treatment technology usually uses manual hand-held steam or hot water pipelines for manual washing, which is labor-intensive, time-consuming, and cleaning efficiency is not high; pyrolysis technology heats materials to four , Five hundred degrees of pyrolysis reaction, there is a big ...

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Problems solved by technology

Hot water washing low-temperature treatment technology usually uses manual hand-held steam or hot water pipelines for manual washing, which is labor-intensive, time-consuming, and cleaning efficiency is not high; pyrolysis technology heats materials to four , Five hundred degrees of pyrolysis reaction, there is a big safety hazard, incineration technology will also cause a great waste of my country's not rich oil resources, in addition, the equipment and pipelines used in high temperature treatment technology are prone to frequent wear and tear The problem of blockage requires frequent shutdowns for maintenance, and the production is extremely unstable

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