Recycling treatment method of oil-bearing sludge

A technology for sludge treatment and oil sludge, which is applied in pyrolysis treatment of sludge, cracking, catalytic cracking, etc. It can solve the problems of low quality of recovered oil and poor separation effect of oil and mud and sand, and achieve low production volume and resource utilization. less likely effect

Inactive Publication Date: 2010-07-14
TSINGHUA UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of poor separation effect of oil and mud and sand and low quality of recovered oil in current oily sludge treatment methods, the present invention provides a convenient, energy-saving, efficient and economical oily sludge treatment method

Method used

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  • Recycling treatment method of oil-bearing sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1, process oily sludge

[0034] The oily sludge from an oilfield is selected, and the mass ratio of mud, sand, oil and water is: 79.69:18.61:1.70.

[0035] The oily sludge is thermally desorbed at a temperature of 500°C and a residence time of 45 minutes; the precipitated pyrolysis gas enters the catalytic pyrolysis device, and is catalytically pyrolyzed with fly ash as a catalyst at a temperature of 450°C and a residence time of 10 seconds. The precipitated gas is condensed to obtain pyrolysis liquid and combustible gas; the pyrolysis liquid is separated from oil and water to obtain recovered oil; the pyrolysis gas is used as fuel, and the combustion provides energy for thermal desorption and catalytic pyrolysis of oil sludge. As a result of the reaction, 0.13 tons of recovered oil, 0.02 tons of combustible gas and 0.85 tons of solid residue can be produced for each ton of oily sludge treated, with a reduction rate of 15%; the ratio of gasoline, diesel and h...

Embodiment 2

[0036] Embodiment 2, processing oily sludge

[0037] The oily sludge from an oilfield is selected, and the mass ratio of mud, sand, oil and water is: 79.69:18.61:1.70.

[0038] The oily sludge is thermally desorbed at a temperature of 550°C and a residence time of 30 minutes; the precipitated pyrolysis gas enters the catalytic pyrolysis device, and is catalytically pyrolyzed with fly ash as a catalyst at a temperature of 500°C and a residence time of 5 seconds. The precipitated gas is condensed to obtain pyrolysis liquid and combustible gas; the pyrolysis liquid is separated from oil and water to obtain recovered oil; the pyrolysis gas is used as fuel, and the combustion provides energy for thermal desorption and catalytic pyrolysis of oil sludge. As a result of the reaction, 0.14 tons of recovered oil, 0.032 tons of combustible gas and 0.811 tons of solid residue can be produced for every ton of oily sludge treated, with a reduction rate of 18.9%; the ratio of gasoline, diesel ...

Embodiment 3

[0039] Embodiment 3, processing oily sludge

[0040] The oily sludge from an oilfield is selected, and the mass ratio of mud, sand, oil and water is: 79.69:18.61:1.70.

[0041] The oily sludge is thermally desorbed at a temperature of 550°C and a residence time of 30 minutes; the precipitated pyrolysis gas enters the catalytic pyrolysis device, and is catalytically pyrolyzed at a temperature of 550°C and a residence time of 2s with fly ash as a catalyst. The precipitated gas is condensed to obtain pyrolysis liquid and combustible gas; the pyrolysis liquid is separated from oil and water to obtain recovered oil; the pyrolysis gas is used as fuel, and the combustion provides energy for thermal desorption and catalytic pyrolysis of oil sludge. As a result of the reaction, 0.14 tons of recovered oil, 0.03 tons of combustible gas and 0.83 tons of solid residue can be produced for each ton of oily sludge treated, with a reduction rate of 17%; the ratio of gasoline, diesel and heavy ...

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Abstract

The invention discloses a treatment method of oil-bearing sludge. The method comprises the following steps of: firstly, carrying out thermal desorption treatment on the oil-bearing sludge to obtain an oil component in the oil-bearing sludge; and then, carrying out catalytic pyrolysis on the oil component, carrying out oil-gas-water separation after condensing the precipitated gas, and collecting recovered oil and combustible gas. The two-stage treatment method for carrying out the thermal desorption and the catalytic pyrolysis on the oil-bearing sludge, which is provided by the invention, can effectively separate oil and sand, also obtains the recovered oil with high added value, generates the combustible gas, can realize recycle at the inside of a system and has high total recycling utilization level and good process economy. Compared with other treatment techniques, the technique has the advantages of high recovery rate of oil resources, good economy, strong adaptability and small secondary pollution and is a recycling treatment technique of the oil-bearing sludge, which can realize the recycle of resources and energy resources simultaneously and is worth popularizing.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, and in particular relates to a resource treatment method for oily sludge. Background technique [0002] As the world's largest developing country and major oil producer, China's production conditions and pollution control technologies are relatively backward. A large amount of oily sludge is produced in the process of crude oil extraction, gathering and refining. It is estimated that my country's annual output of oily sludge is nearly 3 million tons, and only the three major oil fields of Daqing, Shengli, and Liaohe produce more than 2 million tons of oily sludge each year. Moreover, most oil fields in my country have entered the "three high" stage of high water cut, high oil recovery rate, and high recovery degree. With the increase of water injection, the amount of oily sludge generation also increases. [0003] In addition to mud and water, oily sludge also contains a certain amount of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/10C10G11/00
CPCY02W10/40
Inventor 刘建国宋薇聂永丰
Owner TSINGHUA UNIV
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