Method and device for processing oil-containing silt by means of low-speed rotational flow

Abstract

The invention relates to a method and device for processing oil-containing silt by means of low-speed rotational flow. The method is characterized by including the following steps that (1) fluid movement parameters are determined; (2) working condition parameters of the device are determined; (3) the oil-containing silt is processed by means of the low-speed rotational flow. According to the device, an oil water overflow hole is formed in the top center of a cylindrical tank body; an oil-containing silt slurry inlet pipeline is tangentially arranged on the outer wall, 300-800 mm below the oilwater overflow hole, of the upper part of the cylindrical tank body; 1-3 circles of an oil-containing silt slurry rotational flow guiding groove which is arranged spirally downwards and has the screwpitch ranging from 100 mm to 600 mm is formed from an oil-containing silt slurry inlet on the inner wall of the upper part of the cylindrical tank body; a spiral conveying type stirrer is mounted at the bottom of the cylindrical tank body; and the tail end of the spiral conveying type stirrer is connected with a silt slurry outlet pipeline.

Description

technical field [0001] The invention relates to a purification treatment system, in particular to a method and a device for treating oil sludge and sand by using low-speed swirling flow. Background technique [0002] At present, in the process of purifying and treating oily sediment at home and abroad, the technology of purifying and treating oily sediment by physical thermochemical water washing is widely used, but the oil content of the net sediment after treating different types of oily sediment is very different, and it cannot be obtained. Meet the requirements of "Comprehensive Utilization of Oily Sludge from Onshore Oil and Gas Exploitation and Pollution Control Technology". [0003] The reasons for this phenomenon are mainly in the following aspects: [0004] (1) The existing physical thermochemical water washing method to purify and treat oily sand requires adding cleaning agents to the homogenized oily mud and sand slurry for a certain period of time to produce eff...

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Problems solved by technology

[0004] (1) The existing physical thermochemical water washing method to purify and treat oily sand requires adding cleaning agents to the homogenized oily mud and sand slurry for a certain period of time to produce effects, especially when dealing with oily muddy sands containing a large amount of polymers. It takes more than 30 minutes to crack the polymer. In order to prevent the oil sludge sand particles from settling during this time, the oil sludge mortar must be stirred continuously to prevent the oil sludge sand particles from sinking, which results in a certain grain of sand The sludge oil stripped from the upper surface is adsorbed to another mud sand particle from which the sludge oil has been stripped during the floating process, so that the oil content of the net mud sand produced after treatment increases

[0005] (2) During the effective time of the physical thermochemical water washing method to purify and treat the oil sludge mortar, in order to prevent the deposition of the net mud and sand, which makes it impossible to use the water flow to mix and export, the cleaned mud and sand must be continuously stirred, which results in a clean The fine mud particles float up and mix with crude oil again, so that the oil content of the treated net mud sand increases

[0006] (3) Even if the crude oil that has been stripped from the oil sludge particles has floated on the liquid surface, if it does not leave the oil sludge mortar in time, it will be mixed with the cleaned mud sand again during the process of stirring the oil sludge mortar. As a result, the oil content of the treated net mud sand is not up to the standard

[0007] (4) In order to improve work efficiency, it is necessary to adopt a continuous purification treatment process, but under the continuous purification treatment condition, mechanical agitation cannot distinguish the oil sludge and mortar input at different times, so that some oil and sand particles are cleaned and treated for too long , the cleaning time of some oily sand particles is too short, which makes it difficult for the oil content of the discharged net sand to reach the standard stably

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