Resource treatment method for petrochemical oily sludge

Abstract

The invention provides a resource recovery treatment method for petrochemical oily sludge. Considering the difference of viscosity, oil content, water content and other indexes between three-sludge and storage and transportation tank cleaning oily sludge, the resource recovery treatment method abandons the traditional treatment process, transports the three-sludge and the storage and transportation tank cleaning oily sludge to a homogenizing tank for stirring and mixing. On the one hand, the storage and transportation tank cleaning oily sludge with oil content and viscosity much higher than that of the three sludge and oil separation tank bottom sludge and flotation scum in different proportions are mixed together for homogenizing to complete recycling treatment of different types of oil sludge at the same time through one set of recycling treatment device. On the other hand, through carrying out homogenization and coking treatment on the oily sludge before and after mixing of the oilysludge simultaneously, the mixed oily sludge meets the treatment load and efficiency of a subsequent coking device in terms of viscosity, oil content, water content and main component properties, andthe effect and the cost of recycling of the petrochemical oily sludge can be fundamentally solved.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for resourceful treatment of petrochemical oil sludge Background technique [0002] In the petrochemical industry, waste water and waste residues generated in various production links of refineries usually need to be treated in sewage workshops. After the sewage is purified, harmful substances are concentrated to form oily sludge, referred to as oily sludge or three sludges, which generally include grease trap bottom sludge, Flotation scum and biochemical sludge, these sludges generally exist in the form of solid waste rich in mineral oil, the main components are crude oil, mud and water, usually, the viscosity of the three sludges is about 1mpa.s ~ 100mpa.s range, oily The ratio is 3% to 15%, the water content is about 80%, and the rest are toxic chemicals, such as heavy metal ions, benzene series or phenols; oil sludge is industrial hazardous waste, an...

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Problems solved by technology

[0004] In addition to the above-mentioned sludge, storage and transportation cleaning sludge is also a typical petrochemical sludge to be treated. Usually, storage and transportation cleaning sludge is produced during the treatment of oil extraction wastewater. Due to the fine particles contained in the sewage itself, such as mud, sand, and heavy oil itself The existing colloids, heavy metals and asphaltenes, etc., cause a small amount of crude oil to sink to the bottom of the oil storage tank, and then form black, fine-grained and oily sludge. Even after mechanical dehydration and deoiling, there is still a large amount of clear oil. Tank sludge exists, which is not easy to recycle. Compared with the above-mentioned petrochemical sludge, the oil content in the storage and transportation sludge is high (20% to 50%), and the oil ratio is large, the viscosity is high (≥1000mpa.s), colloid and asphalt Because of its high quality content, it is difficult to recycle resources. At present, incineration, pyrolysis, biological treatment, solvent extraction and thermochemical washing are generally used for treatment. high cost issues

[0005] Therefore, the treatment of petrochemical oil sludge in the prior art mainly has the following problems: the three sludge and the storage and transportation cleaning sludge are treated separately, and although the storage and transportation cleaning sludge has a high oil content, it is difficult to carry out resource treatment; at the same time, for the three sludge Whether it is homogenization first and then coking, or dehydration and then coking, practice has proved that the treatment effect of coking is not very ideal, mainly because although the moisture content of the three sludges after dehydration is guaranteed, the three sludges themselves have many components As a result, the condensation and cracking of heavy oil can only be partially completed during the coking process of oil sludge, which not only prolongs the coking time, but also leads to incomplete resource recovery, and the coking treatment results cannot be effectively guaranteed; The moisture content is high, and it is easy to exceed the processing load of the coking unit, resulting in a sharp increase in processing costs

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