Method for microwave treatment of oily sludge

Abstract

The invention discloses a method for microwave treatment of oily sludge. The method comprises the following steps: introducing oily sludge into microwave treatment equipment, carrying out microwave pyrolysis reaction under the protection of nitrogen, carrying out condensation separation on the generated pyrolysis gas to obtain purified oil, and discharging the residual sludge from the microwave treatment equipment. Compared with traditional pyrolysis, microwave pyrolysis has a unique heat and mass transfer rule and better heating uniformity, temperature regulation and control, the pyrolysis process and expected final products are easy to control, a large amount of time and energy can be saved, and the thermal inertia of the equipment is small; according to the method for microwave treatment of oily sludge, oil and water in the oily sludge can be fully recycled, meanwhile, the recycling cost of the oily sludge is reduced, the treated sludge meets the environment-friendly emission requirement (the oil content reaches 0.3% or below), and secondary pollution is prevented.

Description

technical field [0001] The invention relates to the technical field of environmental protection treatment, in particular to a method for microwave treatment of oily sludge. Background technique [0002] Oily sludge is one of the important pollutions produced in the development process of petroleum enterprises, and it is also a major problem restricting the continuous improvement of the environmental quality of oilfields. The annual output of oily sludge in my country exceeds 5 million tons. These oily sludges are an extremely stable suspended emulsion system with complex composition, containing a large amount of petroleum, benzene series, phenols and other odorous toxic substances, as well as waxes. quality, asphaltenes, colloids, suspended solids, bacteria, salts, acid gases, corrosion products, etc., as well as water treatment agents such as flocculants, corrosion inhibitors, scale inhibitors, and fungicides added in the production process . In addition, oil sludge also ha...

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Problems solved by technology

Recycling methods such as solvent extraction, incineration, high-temperature pyrolysis, etc. Among them, although solvent extraction can recycle some hydrocarbons in oil sludge, the actual operating cost is high and industrialization cannot be realized. Extraction treatment of oil sludge is easy to produce sewage, which increases the difficulty of sewage treatment and the later cost of oil sludge treatment; the flue gas discharged when incineration treatment of oil sludge will contain toxic substances such as dioxins, which increases the cost of flue gas treatment; high temperature pyrolysis method There are many petroleum substances recovered from the treatment of oily sludge, the cost of the treatment process is not high, and it is not easy to produce secondary pollutants. It has broad prospects and development space. Heating the oil sludge by means of different methods, resulting in different heating speeds between the surface and the center of the material, and a large temperature difference. The oil content of the treated oil sludge cannot reach the national standard of 3‰ or less