Harmless treatment method for oil stain solid waste

Abstract

The invention discloses a harmless treatment method for oil stain solid waste. The harmless treatment method is characterized by comprising a pretreatment unit, a drying unit, a pyrolysis unit, a pyrolysis gas quenching unit, a non-condensable gas purification unit and an oil-water treatment unit. The method comprises the following specific steps: step 1, pretreating the oil stain solid waste: feeding the oil stain solid waste into a pretreatment unit, crushing the oil stain solid waste by using a crusher, feeding the crushed oil dirt solid waste into a rotary screen for screening, screening out inorganic matter with the particle size of more than 8-10mm in the oil dirt solid waste, putting the oil dirt solid waste back to the crusher for continuously crushing, and remaining oil dirt solid waste smaller than 8-10 mm to enter next step. The method is easy to operate, stable and reliable in equipment operation and good in pyrolysis effect in the whole process, the oil-gas separation cost is reduced, the oil-gas quality is improved, the occupied area of the equipment is greatly reduced while continuous operation is realized under the condition of the same treatment capacity, and meanwhile, the thermal efficiency is high, and the economic benefit is obvious.

Description

technical field [0001] The invention relates to a method for harmless treatment of oily solid waste, relates to the technical field of solid waste treatment, and in particular to a method for treating oily solid waste. [0002] technical background [0003] Oil pollution and solid waste is a solid waste that is included in the "National Hazardous Waste List" and has always been an environmental protection problem in the petroleum and petrochemical industry. Usually, it is in a solid or semi-fluid state, and is a heterogeneous multiphase dispersion system, mainly composed of crude oil, water, clay minerals, biological organic matter and chemical additives, etc. The general oil content ranges from 5-10%, and the highest can reach 20-30%, which has the value of energy material recovery and mineral regeneration. In addition to a large amount of residual oil, the oil sludge also contains toxic substances such as benzene series, anthracene, phenols, and pyrene, a large number of p...

AI Technical Summary

Problems solved by technology

At present, domestic treatment methods mainly include incineration, thermochemical washing, biological methods, etc., all of which have limitations and shortcomings, or the treatment effect is not up to standard, or the treatment cost is high, or the process conditions are high, or there is secondary pollution, etc.

The incineration method uses high temperature to directly incinerate organic matter, which cannot realize the recovery of petroleum resources, and the secondary pollution caused by incineration flue gas is difficult to control, especially easy to produce dioxin, which is very easy to cause serious harm to the human body; thermochemical washing method, biological The treatment effects such as methods cannot meet the standard of TPH ≤ 0.3%, and are gradually replaced by high-standard technologies

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