Method for treating tank bottom oil-containing sludge and treatment system

Abstract

The invention provides a method for treating tank bottom oil-containing sludge and an oil-containing sludge treatment system. The method comprises the procedures of homogenizing treatment, solid-liquid separation, plasma thermal pyrolysis, gas purification and oil-water separation. The system comprises a homogenizing unit, a solid-liquid separation unit, a plasma thermal pyrolysis unit, a gas purifying unit, an oil-water separation unit and a steam generation unit. By adopting the method, the treatment cost is lowered. The system is simple and convenient in treatment operation, is low in equipment requirement, and can complete innocent treatment of tank bottom sludge while completing tank cleaning (TPH (Total Petroleum Hydrocarbons) in the treated sludge is less than 0.03 percent).

Description

technical field [0001] The invention belongs to the field of sludge treatment, and in particular relates to a method for treating oily sludge at the bottom of a tank. Background technique [0002] The large tanks in the oil field joint station and other stations need to be cleaned. The cleaned bottom sludge has a high oil content and is relatively large in quantity. If the tank bottom sludge is transported outside for treatment, it will involve loss of crude oil and high the transfer fee. And in the process of transfer, if the transfer vehicle is not tightly sealed, it will release a huge irritating smell during the transfer, which will affect the air environment quality on the way. If it is piled up in the station without treatment, it will not only pollute the local environment, but also greatly waste the limited oil resources. [0003] Plasma is the fourth state different from solid state, liquid state and gaseous state. It has unique physical and chemical properties. P...

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Problems solved by technology

The chemical hot washing method is mainly through the process of drum screening-aeration and grit settling-heating-dosing conditioning-solid-liquid separation. This method requires a large amount of chemicals and steam. Hydrocarbons < 5%, can partially reduce the amount of oily sludge, and the process is long and there are many skids, so only centralized treatment methods can be used instead of decentralized treatment

Incineration is the use of natural gas or heavy oil to ignite oily sludge at high temperature, and the hydrocarbons in the oily sludge are decomposed to achieve harmless treatment. However, the smoke generated by incineration is large and the treatment cost is high; and ash residues are hazardous wastes that require secondary treatment, which increases treatment costs

Thermal desorption is mainly to heat the oily sludge through the partition wall under the condition of anaerobic or anoxic, and volatilize the water and hydrocarbons in the oily sludge according to the water in the oily sludge and the boiling points of various hydrocarbons. The tar produced during the desorption process is easy to coke in the inner wall of the reactor, leading to equipment failure and the actual processing capacity of the thermal desorption devices currently on the market is far less than the designed processing capacity, so the oily sludge cannot be treated within the expected time. Increased processing costs

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