A kind of sludge treatment method

Abstract

The invention discloses an oil sludge treatment method. The treatment method comprises the following steps: oil sludge enters a drying unit for drying and dehydration, and after dehydration treatment, dewatered oil sludge and gas-phase materials are obtained; the dewatered oil sludge enters a pyrolysis reaction unit for pyrolysis reaction, and cracked gas is obtained after the reaction. , oil and coke; the gas-phase material obtains non-condensable gas and condensed water after heat exchange; the cracked gas and non-condensable gas enter the combustion unit, contact with the oxygen-containing atmosphere for combustion reaction, and use the hot flue gas generated by the reaction as the heat source as the drying unit And the pyrolysis reaction unit provides heating heat. The invention provides a sludge reduction, harmless and resourceful treatment method, which realizes the maximum reduction and resource utilization of sludge, and at the same time recovers high-value oil products without causing secondary pollution in the whole processing process.

Description

technical field [0001] The invention belongs to the technical field of oil sludge treatment, and in particular relates to a process for microwave-assisted drying and low-temperature cracking of oil sludge. [0002] technical background [0003] Sludge includes several types of oil sludge produced in the process of oil production, such as oil sludge at the well site, oil sludge at the bottom of oil storage tanks, and residual oil from refineries. Mud 30wt% ~ 60wt%. Oily sludge is a kind of brown-black viscous solid waste with complex components, large amount and wide area. It is generally composed of oil-in-water, water-in-oil and suspended solid impurities. It is an extremely stable suspension emulsion system. Due to the high oil content in oil sludge, if it is directly disposed of, it will cause environmental pollution and waste of resources. [0004] Due to the numerous sources and complex components of oily sludge, there are various treatment technologies. The common tre...

AI Technical Summary

Problems solved by technology

However, the bioreactor takes a long time to process, oil resources cannot be recovered, and there is secondary pollution

The advantage of the extraction method is that the sludge can be treated more thoroughly, oil resources can be recovered, and the operation is simple, but the extraction agent is expensive, the treatment cost is high, and the extraction process is long, resulting in secondary pollution

The advantage of coking treatment is that the oil resources in the oil pollution are recovered, and the recovery rate is relatively high; the disadvantage is that the product is easy to coke during the process, which makes high requirements for equipment materials and high energy consumption

The chemical heat washing technology can separate the three phases of oil, water and mud in the oil sludge, recover most of the oil resources in the oil sludge, and realize the resource utilization of the sludge. The disadvantage of this method is that a large amount of sewage is generated, and there are secondary The problem of sewage treatment, and the treatment cost is high and the efficiency is low

[0005] CN107937003A discloses a method and device for oil sludge treatment. The oil sludge is mixed with coal coke, dust, and tar slag and then mixed into coking coal and converted into gas, which solves the problem of difficult and high disposal cost of water treatment oil sludge, but Waste oil cannot be recovered, and resource utilization has not been realized

[0006] CN107777847A provides a harmless, resource-based, and integrated treatment method for oil sludge. The waste oil is subjected to oxygen-enriched deep cracking in a cracking device at 850-1000 ° C, and the oil sludge is completely burned into cracked gas and residue by high temperature, which can High consumption and no recovery of dirty oil