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Oil sludge treatment method

A treatment method and technology for sludge, applied in the fields of sludge treatment, water/sludge/sewage treatment, combustion methods, etc., can solve the problems of easy coking of products, large amounts of sewage, and long processing time of bioreactors.

Active Publication Date: 2020-07-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]The sludge enters the drying unit for drying and dehydration. Turn on the microwave heating with a frequency of 2450MHz, and the microwave power is 600W. After heating to 80°C, turn off the microwave, and use the hot flue gas generated by the reaction as the heat source to continue heating to 95°C. The whole process of dehydration treatment takes 5 hours , to obtain dehydrated oil sludge and gas phase materials. The water content of dehydrated oil sludge is 24wt%. After the gas is heat-exchanged, non-condensable gas and condensed water are obtained; After heating to 250°C as the heat source, turn on the microwave with a frequency of 2450MHz for heating, the microwave power is 1000W, heat to the temperature of the cracking reactor at 360°C, turn off the microwave, and use the hot flue gas generated by the reaction as the heat source to keep the reaction temperature at 360°C. The pyrolysis reaction time is 1 hour, and the pyrolysis gas, oil and coke are obtained after the r...

Embodiment 2

[0035] The sludge enters the drying unit for drying and dehydration. Turn on the microwave heating with a frequency of 2450MHz, and the microwave power is 700W. After heating to 80°C, turn off the microwave, and use the hot flue gas generated by the reaction as the heat source to continue heating to 105°C. The whole process of dehydration treatment takes 2h , to obtain dehydrated oil sludge and gas phase materials. The water content of dehydrated oil sludge is 21wt%. After the gas is heat-exchanged, non-condensable gas and condensed water are obtained; After heating to 250°C as the heat source, turn on the microwave with a frequency of 2450MHz for heating, the microwave power is 1000W, heat to the temperature of the cracking reactor at 360°C, turn off the microwave, and use the hot flue gas generated by the reaction as the heat source to keep the reaction temperature at 360°C. The pyrolysis reaction time is 1 hour, and the pyrolysis gas, oil and coke are obtained after the reac...

Embodiment 3

[0037] The sludge enters the drying unit for drying and dehydration. Turn on the microwave heating with a frequency of 2450MHz, and the microwave power is 700W. After heating to 80°C, turn off the microwave, and use the hot flue gas generated by the reaction as the heat source to continue heating to 105°C. The whole process of dehydration treatment takes 2h , to obtain dehydrated oil sludge and gas phase materials. The water content of dehydrated oil sludge is 21wt%. After the gas is heat-exchanged, non-condensable gas and condensed water are obtained; After heating for the heat source and keeping the reaction temperature at 250°C, the pyrolysis reaction time is 1h, and the cracked gas, oil and coke are obtained after the reaction; the cracked gas and the non-condensable gas of the dehydration unit enter the combustion unit, and the hot flue gas produced by the reaction is dry The unit and the pyrolysis reaction unit provide heating heat. After the reaction, the sludge weight ...

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Abstract

The invention discloses an oil sludge treatment method which comprises the following steps: the oil sludge enters a drying unit to be dried and dehydrated, and dehydrated oil sludge and a gas-phase material are obtained after dehydration treatment; the dehydrated oil sludge enters a pyrolytic reaction unit to be subjected to a pyrolytic reaction, and pyrolysis gas, oil and coke are obtained afterthe reaction; heat exchange on the gas-phase material is performed to obtain non-condensable gas and condensed water; pyrolysis gas and non-condensable gas enter the combustion unit to be in contact with oxygen-containing atmosphere for a combustion reaction, and hot smoke generated by the reaction serves as a heat source to provide heating heat for the drying unit and the pyrolytic reaction unit.According to the oil sludge reduction, harmlessness and resourceful treatment method, reduction and resourceful utilization of the oil sludge are achieved to the maximum extent, meanwhile, high-valueoil products are recycled, and secondary pollution is avoided in the whole treatment 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...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/13C02F11/131C02F11/10F23G7/06C02F101/30
CPCC02F11/00C02F11/12C02F11/10F23G7/06C02F2303/06C02F2303/10C02F2101/30Y02W10/40
Inventor 赵丽萍宋永一王鑫张彪吴斯侃刘继华张长安
Owner CHINA PETROLEUM & CHEM CORP
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