Oil-containing sludge treatment method and process flow

Abstract

The invention belongs to an oil-containing sludge treatment method, and particularly relates to a method and process flow for treating oil-containing sludge having an oil content of more than 10%. The method is characterized by comprising the following steps: for oil-containing sludge having a water content of more than 70%, adding pH regulator, and regulating the pH value to 7-8; adding inorganic flocculant and organic flocculant, and performing dehydration treatment; after dehydration, feeding the oil-containing sludge into a pyrolysis device, performing low-temperature pyrolysis, and feeding gas generated by the pyrolysis into a gas recovery device for recycling; performing oil-water separation on the generated oil and water through an oil-water separation device, feeding the separated oil into an oil storage tank for recycling, and feeding the separated water into a sewage treatment device or an oilfield water treatment system; and adding igniter, combustion improver, binder and desulfurizer into the remaining sludge after the pyrolysis, feeding into a fuel preparation device, and preparing into fuel for utilization. The invention solves the technical problem on oil-containing sludge treatment for oilfield and refinery enterprises, and achieves the purposes of effectively recycling resources, saving energy, reducing emission and protecting environment.

Description

technical field [0001] The invention belongs to a treatment method for oily sludge, in particular to a treatment method and process flow for oily sludge with an oil content greater than 10%. Background technique [0002] A large amount of oily sludge will inevitably be produced in the process of exploration, development, storage and transportation in oil fields and in the refining process of refining and chemical enterprises. These oily sludges have the characteristics of complex composition, large changes in oil content, and difficult treatment. Improper use not only seriously pollutes groundwater, surface water and the surrounding environment, but also causes waste of oil resources. [0003] At present, our country has strengthened the work of environmental protection. According to the "Management Measures for the Collection Standards of Sewage Discharge Fees", the disposal of hazardous wastes in landfills does not comply with the relevant national regulations. The standar...

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Problems solved by technology

Oily sludge is a hazardous solid waste. For this reason, major domestic oil fields and refining and chemical companies have strengthened the research on oily sludge treatment technology, and research departments such as universities and colleges have also participated in it. Although a variety of oily sludge has been developed Treatment methods and processes, such as: incineration, pyrolysis, extraction, biological methods, etc., but due to the limitations of treatment costs, required process conditions and other factors, the actual industrial application of the research results is not much, and most domestic oil fields still use landfill method to treat oily sludge, and the landfill is not up to standard. A few oilfields use methods such as supergravity solid-liquid separation and ultrasonic radiation treatment to recover crude oil, but the oil content of oily sludge after treatment still does not meet environmental protection requirements.

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