CN116040893A - Method and system for treating oil sludge - Google Patents

Method and system for treating oil sludge Download PDF

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Publication number
CN116040893A
CN116040893A CN202111261896.5A CN202111261896A CN116040893A CN 116040893 A CN116040893 A CN 116040893A CN 202111261896 A CN202111261896 A CN 202111261896A CN 116040893 A CN116040893 A CN 116040893A
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Prior art keywords
oil
cleaning agent
phase
inlet
liquid
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CN202111261896.5A
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Inventor
陆语
王振宇
苗杰
沈明欢
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Sinopec Research Institute of Petroleum Processing
China Petroleum and Chemical Corp
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Sinopec Research Institute of Petroleum Processing
China Petroleum and Chemical Corp
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/006—Electrochemical treatment, e.g. electro-oxidation or electro-osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
    • C02F2103/365—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds from petrochemical industry (e.g. refineries)
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing

Abstract

The present disclosure relates to a method and system for treating sludge, the method comprising the steps of: s1, mixing oil sludge, inferior hydrocarbon oil and a cleaning agent, and stirring and extracting to obtain a solid-liquid mixture; s2, carrying out solid-liquid separation treatment on the solid-liquid mixture to obtain a solid phase and a liquid phase; s3, mixing the liquid phase with a pH regulator and a demulsifier, and performing oil-water separation treatment on the obtained mixed liquid to obtain a water phase and an oil phase; wherein the cleaning agent is a water-soluble cleaning agent. The water-soluble cleaning agent is mixed with the oil sludge and the inferior hydrocarbon oil, and the pH value is adjusted, so that the cleaning agent can be recycled, the treatment cost is reduced, and the separation efficiency is improved.

Description

Method and system for treating oil sludge
Technical Field
The present disclosure relates to the field of sludge treatment, and in particular, to a method and system for treating sludge.
Background
The oil sludge is oily sludge formed by contacting crude oil or other oil products with silt in the processes of crude oil exploitation, storage and transportation, refining and the like of petrochemical enterprises, and the main components of the oil sludge are oil, water and mud, and three phases are easy to form a stable system so as to be difficult to treat. Besides oil components, the oil sludge also contains heavy metal ions (such as iron, copper, nickel and the like), and meanwhile, the salt content is higher. The pressure of system operation can be increased to the fatlute in production system, causes extra energy consumption, and the fatlute of clear up owing to contain toxic and harmful substance such as sulphide, benzene series thing, phenols, the improper handling can pollute water and soil, makes quality of water worsen, and oil class in the soil exceeds standard to make ecological environment influenced.
The sludge is currently classified by the country as dangerous solid waste, and is contained in the dangerous solid waste for management. Along with the increasingly strict national requirements on environmental protection, the reduction, harmless and recycling of the oil sludge becomes a necessary trend of the development of the treatment technology. Therefore, the economic and effective treatment and utilization of the oil sludge has important practical significance for the development of the petrochemical industry.
The prior art for treating the oil sludge mainly comprises an incineration method, a pyrolysis method, a biological treatment method, a solvent extraction method and the like, and each treatment technology has respective advantages and disadvantages and applicable ranges. The cost of treating the oil sludge by the incineration method is high, secondary pollution is possibly caused after the incineration, and the oil content in the oil sludge is not effectively utilized; the pyrolysis method for treating the oil sludge has higher requirements on reaction conditions, high equipment investment and complex operation; the biological treatment method has longer treatment period of the oil sludge, large occupied area of equipment and larger influence of environmental climate. The solvent extraction method is considered as a better method for treating the oil sludge, and has the advantages that the technical process is simple, the oil content in the oil sludge can be recycled, but the extracting agent used by the existing solvent extraction method is expensive, and the recycling process of the extracting agent is complex, so that the cost for treating the oil sludge is higher.
Disclosure of Invention
The purpose of the present disclosure is to provide a method and a system for treating oil sludge, wherein after the oil sludge is moderately treated by the method, the recovered oil passes through an electric desalting device and then meets the recycling condition, and the cleaning agent is recoverable, has low cost and is suitable for industrial application.
To achieve the above object, a first aspect of the present disclosure provides a method of treating sludge, the method comprising the steps of:
s1, mixing oil sludge, inferior hydrocarbon oil and a cleaning agent, and stirring and extracting to obtain a solid-liquid mixture;
s2, carrying out solid-liquid separation treatment on the solid-liquid mixture to obtain a solid phase and a liquid phase;
s3, mixing the liquid phase with a pH regulator and a demulsifier, and performing oil-water separation treatment on the obtained mixed liquid to obtain a water phase and an oil phase;
wherein the cleaning agent is a water-soluble cleaning agent.
Optionally, the method further includes: and (3) returning the water phase in the step (S3) as the cleaning agent to the step (S1) for continuous use.
Optionally, in step S1, the stirring extraction process includes: firstly mixing and stirring the inferior hydrocarbon oil and the oil sludge for 5-30min, and then adding the cleaning agent for continuous stirring.
Optionally, in step S1, the mass ratio of the sludge to the inferior hydrocarbon oil is 1: (1-6); the addition amount of the cleaning agent is 500-3000mg/kg relative to the total mass of the oil sludge.
Optionally, in step S1, the stirring extraction process is performed in a stirring extractor, and the conditions of the stirring extraction process include: the stirring mode is mechanical stirring, the temperature is 50-90 ℃, the rotating speed is 100-600rpm, and the time is 20-90min.
Optionally, in step S2, the solid-liquid separation process includes: and pumping the solid-liquid mixture into a primary centrifugal machine and a secondary centrifugal machine in sequence for centrifugal separation.
Optionally, the rotating speed of the primary centrifugal machine is 2000-3000rpm, and the rotating speed of the secondary centrifugal machine is 3000-4000rpm;
optionally, the rotational speed of the primary centrifuge is less than the rotational speed of the secondary centrifuge.
Optionally, step S1 further includes: the cleaning agent is diluted to 2-10% by mass with deionized water, and comprises one or more of sodium carboxylate, ammonium carboxylate, sodium alkyl sulfonate, sodium benzene sulfonate and polyether acid amine; wherein the weight average molecular weight of the polyether acid amine is 200-2000;
the inferior hydrocarbon oil comprises one or more of catalytic diesel oil, catalytic slurry oil, catalytic light cycle oil, catalytic heavy cycle oil, recovered light dirty oil and recovered heavy dirty oil.
Optionally, in step S3, the mass fraction of the pH adjuster is 10-20%, and the mass ratio of the pH adjuster to the liquid phase is (0.01-0.03): 1, the pH regulator comprises one or more of hydrochloric acid, sulfuric acid, nitric acid, formic acid, acetic acid, propionic acid, butyric acid, malic acid and citric acid;
the adding amount of the demulsifier is 100-500mg/L relative to the total volume of the liquid phase, and the demulsifier is one or more selected from RP-01 type demulsifier, RP-02 type demulsifier and RP-03 type demulsifier, preferably RP-02 type demulsifier.
Optionally, in step S3, the oil-water separation process includes: mixing the mixed solution in a static mixer, and then separating the water phase and the oil phase in a cleaning agent regenerating device, wherein the operating conditions of the cleaning agent regenerating device comprise: the temperature is 50-90deg.C, and the time is 30-120min.
Optionally, the method further comprises: and (3) delivering the oil phase obtained in the step (S3) into an electric desalting device for desalting, and then carrying out recycling.
A second aspect of the present disclosure provides a system for treating sludge using the method of the first aspect of the present disclosure, the system comprising:
the stirring extractor comprises an inferior hydrocarbon oil inlet, a cleaning agent inlet, an oil sludge inlet and a solid-liquid mixture outlet;
the solid-liquid separation device comprises a solid-liquid mixture inlet, a solid phase outlet and a liquid phase outlet; wherein the solid-liquid mixture inlet is connected with the solid-liquid mixture outlet;
the oil-water separation unit comprises a liquid phase inlet, a pH regulator inlet, a demulsifier inlet, a water phase outlet and an oil phase outlet; wherein the liquid phase inlet is connected with the liquid phase outlet, and the water phase outlet is connected with the cleaning agent inlet.
Optionally, the oil-water separation unit comprises a static mixer and a cleaning agent regeneration device;
the static mixer comprises the liquid phase inlet, a mixed liquid outlet, a pH regulator inlet and a demulsifier inlet;
the cleaning agent regeneration device comprises a mixed liquid inlet, a water phase outlet and an oil phase outlet;
the mixed liquid outlet is connected with the mixed liquid inlet.
Optionally, the system further comprises: an electric desalting device comprising an oil phase inlet and an oil outlet; wherein the oil phase inlet is connected with an oil phase outlet of the cleaning agent regeneration device.
Through the technical scheme, the method disclosed by the invention uses the water-soluble cleaning agent and the inferior hydrocarbon oil to treat the oil sludge, the oil sludge is mixed with the water-soluble cleaning agent and the inferior hydrocarbon oil and the pH is adjusted, so that the cleaning agent can be regenerated and circulated in a simple mode, the treatment cost is reduced, the separation efficiency and the recovery rate of oil products are improved, and the method is suitable for industrial application.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
fig. 1 is a schematic diagram of a sludge treatment system of the present disclosure.
Description of the reference numerals
1. Sludge 2, inferior hydrocarbon oil 3 and cleaning agent
4. Aqueous phase 5, pH regulator and demulsifier 6, solid phase
7. Liquid phase 8, oil phase 9, stirring extractor
10. Cleaning agent regeneration device 11, static mixer 12 and electric desalting device
13. Atmospheric and vacuum removing device 14, primary centrifugal machine 15 and secondary centrifugal machine
16. Pump with a pump body
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
A first aspect of the present disclosure provides a method of treating sludge, the method comprising the steps of:
s1, mixing oil sludge, inferior hydrocarbon oil and a cleaning agent, and stirring and extracting to obtain a solid-liquid mixture;
s2, carrying out solid-liquid separation treatment on the solid-liquid mixture to obtain a solid phase and a liquid phase;
s3, mixing the liquid phase with a pH regulator and a demulsifier, and performing oil-water separation treatment on the obtained mixed liquid to obtain a water phase and an oil phase;
wherein the cleaning agent is an aqueous cleaning agent.
In the present disclosure, the sludge is subjected to pretreatment for removing impurities in the sludge before being subjected to the treatment. The cleaning agent plays a role of a surfactant, and damages an oil-water-solid three-phase stabilizing system in the oil sludge under the condition of stirring to strengthen the extraction process.
According to the method disclosed by the invention, good treatment effects can be achieved on the oil sludge with various sources and properties, and in one embodiment, the used oil sludge can be at least one of storage tank bottom oil sludge, oil separation tank bottom sludge and oil field landing oil sludge, wherein the weight ratio of water, sludge component and oil component in the oil sludge can be 1: (1-8): (1-8).
According to one embodiment of the present disclosure, in order to obtain a better separation effect and reduce the amount of the cleaning agent, in step S1, the stirring extraction process includes: firstly, mixing the inferior hydrocarbon oil and the oil sludge, stirring for 5-30min, and then adding a cleaning agent for continuous stirring. Wherein the stirring extraction treatment is performed in a stirring extractor, and the conditions of the stirring extraction treatment include: the stirring mode is mechanical stirring, the temperature is 50-90 ℃, the rotating speed is 100-600rpm, and the time is 20-90min; preferably, the temperature is 70-80 ℃, the rotating speed is 200-400rpm, and the time is 30-60min.
According to a specific embodiment of the present disclosure, in step S1, the mass ratio of the sludge to the inferior hydrocarbon oil is 1: (1-6), preferably 1: (2-3); compared with the total mass of the oil sludge, the addition amount of the cleaning agent is 500-3000mg/kg, preferably 1000-2000mg/kg, the inferior hydrocarbon oil is mainly used for conditioning the oil sludge, improving the fluidity of the oil sludge, and the cleaning agent is mainly used for separating oil from the surfaces of solid particles.
According to the present disclosure, step S1 further includes: the cleaning agent is diluted with deionized water to a mass fraction of 2-10%, preferably 3-5%. The operation can improve the fluidity of the cleaning agent, reduce the dosage and reduce the treatment cost. The cleaning agent is water-soluble cleaning agent and comprises one or more of sodium carboxylate, ammonium carboxylate, sodium alkyl sulfonate, sodium benzene sulfonate and polyether acid amine; preferably one or more of sodium carboxylate, sodium alkyl sulfonate and polyether acid amine. Wherein the weight average molecular weight of the polyetheramine is 200-2000; preferably 400-600. The sodium carboxylate may be, for example, one or more of sodium stearate, sodium palmitate and sodium oleate, the sodium alkyl sulfonate may be, for example, one or more of sodium dodecyl sulfonate, sodium cetyl sulfonate and sodium stearyl sulfonate, and the ammonium carboxylate may be, for example, one or more of ammonium stearate, ammonium palmitate and ammonium oleate. The cleaning agent used in the invention can control the surface activity, and plays a role of a surfactant when in use, and can reduce the surface activity when in need of regeneration, thereby being easier to break emulsion and realize oil-water separation.
According to one specific embodiment of the disclosure, the inferior hydrocarbon oil comprises one or more of catalytic diesel oil, catalytic slurry oil, catalytic light cycle oil, catalytic heavy cycle oil, recovered light dirty oil and recovered heavy dirty oil, preferably one or more of catalytic diesel oil, catalytic light cycle oil and catalytic heavy cycle oil; this is conventional in the art and will not be described in detail.
According to one embodiment of the present disclosure, in step S2, the solid-liquid separation process includes: and (3) sequentially pumping the solid-liquid mixture into a primary centrifugal machine and a secondary centrifugal machine for centrifugal separation. Wherein the rotation speed of the primary centrifugal machine is 2000-3000rpm, preferably 3000rpm; the rotation speed of the secondary centrifuge is 3000-4000rpm, preferably 4000rpm; in one embodiment, the rotational speed of the primary centrifuge is less than the rotational speed of the secondary centrifuge, which can enable more complete separation of solids from liquids and reduce the level of mechanical impurities in the liquid. The solid residue obtained after centrifugation can be used as fuel.
According to one embodiment of the present disclosure, in step S3, the mass fraction of the pH adjuster is 10-20%. The mass ratio of the pH regulator to the liquid phase is (0.01-0.03): 1, a step of; the pH regulator comprises one or more of hydrochloric acid, sulfuric acid, nitric acid, formic acid, acetic acid, propionic acid, butyric acid, malic acid and citric acid; preferably one or more of citric acid, acetic acid and malic acid; the addition amount of the demulsifier is 100-500mg/L, preferably 200-300mg/L, relative to the total volume of the liquid phase; the demulsifier is one or more selected from RP-01 demulsifier, RP-02 demulsifier and RP-03 demulsifier, preferably RP-02 demulsifier, and comprises glycerol polyoxyethylene polyoxypropylene ether. The pH regulator is used for regulating the pH value of the liquid phase and inhibiting the surface activity of the cleaning agent, so that the cleaning agent can be subjected to the subsequent cleaning agent regeneration process, the treatment cost is reduced, and the demulsifier is used for demulsification of the liquid phase.
According to one embodiment of the present disclosure, the method further comprises: and returning the water phase in the step S3 as a cleaning agent to the step S1 for continuous use. The operation can improve the utilization rate of the cleaning agent and reduce the treatment cost.
According to a specific embodiment of the disclosure, in step S3, the oil-water separation process includes: mixing the mixed solution in a static mixer, and then separating the water phase and the oil phase in a cleaning agent regeneration device; further, the water phase can be used as a cleaning agent to return to the step S1 for continuous use, and optionally, the oil phase can be sent to an oil refining device for recycling.
In the above embodiment, further, the operation conditions of the cleaning agent regeneration device include: the temperature is 50-90 ℃, preferably 70-80 ℃; the time is 30-120min, preferably 60-90min.
According to the present disclosure, the method further comprises: the oil phase obtained in the step S3 is sent to an electric desalting device for desalting, and then the desalted oil phase is recycled, for example, sent to an atmospheric and vacuum device for fractionation.
A second aspect of the present disclosure provides a system for treating sludge using the method of the first aspect of the present disclosure, the system comprising:
the stirring extractor comprises an inferior hydrocarbon oil inlet, a cleaning agent inlet, an oil sludge inlet and a solid-liquid mixture outlet;
the solid-liquid separation device comprises a solid-liquid mixture inlet, a solid phase outlet and a liquid phase outlet; wherein the solid-liquid mixture inlet is connected with the solid-liquid mixture outlet;
the oil-water separation unit comprises a liquid phase inlet, a pH regulator inlet, a demulsifier inlet, a water phase outlet and an oil phase outlet; wherein the liquid phase inlet is connected with the liquid phase outlet, and the water phase outlet is connected with the cleaning agent inlet.
According to one embodiment of the disclosure, the oil-water separation unit comprises a static mixer and a cleaning agent regeneration device, wherein the static mixer comprises a liquid phase inlet, a mixed liquid outlet, a pH regulator inlet and a demulsifier inlet; the cleaning agent regeneration device comprises a mixed liquid inlet, a water phase outlet and an oil phase outlet; wherein the mixed liquor outlet is connected with the mixed liquor inlet.
According to one embodiment of the present disclosure, the system further comprises: an electric desalting device, which comprises an oil phase inlet and an oil outlet; wherein the oil phase inlet is connected with the oil phase outlet of the cleaning agent regeneration device. In further embodiments, the oil outlet of the electro-desalting device may be in communication with the feedstock inlet of the refinery device, e.g., the oil outlet may be in communication with the feedstock inlet of the atmospheric and vacuum device.
In the present disclosure, the electric desalting device further comprises a water injection inlet and a sewage outlet.
In this disclosure, "connected" includes both direct and indirect.
In the examples and comparative examples of the present application, the reagents used were all commercially available unless otherwise specified.
Examples 1-6 are presented to illustrate the methods and systems of treating sludge of the present disclosure.
Example 1
Sludge treatment is carried out by using a sludge treatment system as shown in fig. 1. The method comprises the following specific steps:
adding the inferior hydrocarbon oil 2, the cleaning agent 3 and the oil sludge 1 (the weight ratio of water, sludge and oil is 1:2:7) into an extraction stirrer 9 for stirring and extracting treatment, wherein the mass ratio of the oil sludge to the inferior hydrocarbon oil is 1:3, the addition amount of the cleaning agent was 1500mg/kg relative to the total mass of the sludge, the temperature of the stirring extractor 9 was 80 ℃, the rotation speed was 300rpm, and the time was 60 minutes. The inferior hydrocarbon oil is catalytic diesel oil (refined by long-term), the cleaning agent is sodium stearate (mass fraction is 3%), the oil sludge is bottom oil sludge of the storage tank, and the addition amount of the cleaning agent is based on the weight of the sodium stearate.
After extraction is finished, the solid-liquid mixture in the stirring extractor 9 is pumped into a primary centrifuge 14 and a secondary centrifuge 15 in sequence for solid-liquid separation, so as to obtain a liquid phase 7 and a solid phase 6. Wherein the rotation speed of the primary centrifuge 14 is 3000rpm, the rotation speed of the secondary centrifuge 15 is 4000rpm, and a demulsifier and a pH regulator 5 are added to the separated liquid phase 7 to obtain a mixture. Wherein the demulsifier is RP-02 type demulsifier (the adding amount of the demulsifier is 200mg/L relative to the total volume of the liquid phase), the manufacturer is Lin Huashui stabilizer factory, the pH regulator is citric acid with the mass fraction of 10%, the mass ratio of the pH regulator to the liquid phase 7 is 0.01:1, and the mass of the pH regulator is calculated by the mass of the citric acid.
The mixture is mixed in a static mixer 11 and then enters a cleaning agent regeneration device 10 under the following operating conditions: the temperature was 80℃for 120min. The separated aqueous phase 4 is led out of the system. The separated oil phase 8 product was fed into an electric desalting device 12 for desalting, then subjected to fractionation by an atmospheric and vacuum device 13, and the oil phase product obtained by the treatment was tested, and the results are shown in Table 1.
Example 2
Tank bottom sludge was treated by the method of example 1 except that the cleaning agent used was the cleaning agent regenerated in example 1, and the oil product obtained by the treatment was tested and the results are shown in table 1. The separated aqueous phase is led out of the system.
Example 3
Tank bottom sludge was treated by the method of example 1 except that the cleaning agent used was the cleaning agent regenerated in example 2, and the oil product obtained by the treatment was tested and the results are shown in table 1.
Example 4
The bottom sludge of the storage tank was treated by the method of example 1 except that the sludge and the catalytic diesel were added to the stirring extractor and mixed and stirred for 10 minutes, then sodium stearate was added, stirring was continued for 50 minutes, and the oil product obtained by the treatment was tested, and the results are shown in table 1. The separated aqueous phase is led out of the system.
Example 5
Tank bottom sludge was treated by the method of example 4, except that the cleaning agent used was the cleaning agent regenerated in example 4, and the oil product obtained by the treatment was tested, and the results are shown in table 1.
Example 6
The tank bottom sludge was treated by the method of example 1, except that the poor hydrocarbon oil used was recovered light dirty oil, and the oil product obtained by the treatment was tested, and the results are shown in table 1.
Comparative example 1
Tank bottom sludge was treated by the method of example 1, except that the catalytic diesel was replaced with deionized water of equal mass, and the oil product obtained by the treatment was tested and the results are shown in table 1.
Comparative example 2
Tank bottom sludge was treated by the method of example 1 except that the detergent was calcium naphthenate and the oil products obtained by the treatment were tested and the results are shown in table 1.
TABLE 1
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Figure BDA0003326063050000111
According to the data in the table 1, the method and the system for treating the oil sludge can recycle the cleaning agent, reduce the treatment cost and have higher oil separation efficiency; by comparing examples 1-6 with comparative examples 1-2, a better oil separation effect can be obtained by adding inferior hydrocarbon oil and an aqueous cleaning agent, and further, by comparing examples 1-3 and 4-5, the recovery rate and separation efficiency of oil products can be further improved by adopting a method of adding oil sludge and inferior hydrocarbon oil first, stirring and mixing, and then adding the cleaning agent.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations are not described further in this disclosure in order to avoid unnecessary repetition.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims (14)

1. A method of treating sludge, the method comprising the steps of:
s1, mixing oil sludge, inferior hydrocarbon oil and a cleaning agent, and stirring and extracting to obtain a solid-liquid mixture;
s2, carrying out solid-liquid separation treatment on the solid-liquid mixture to obtain a solid phase and a liquid phase;
s3, mixing the liquid phase with a pH regulator and a demulsifier, and performing oil-water separation treatment on the obtained mixed liquid to obtain a water phase and an oil phase;
wherein the cleaning agent is a water-soluble cleaning agent.
2. The method of claim 1, wherein the method further comprises: and (3) returning the water phase in the step (S3) as the cleaning agent to the step (S1) for continuous use.
3. The method according to claim 1, wherein in step S1, the stirring extraction process comprises: firstly mixing and stirring the inferior hydrocarbon oil and the oil sludge for 5-30min, and then adding the cleaning agent for continuous stirring.
4. The method according to claim 1, wherein in step S1, the mass ratio of the sludge to the inferior hydrocarbon oil is 1: (1-6); the addition amount of the cleaning agent is 500-3000mg/kg relative to the total mass of the oil sludge.
5. The method according to claim 1, wherein in step S1, the stirring extraction process is performed in a stirring extractor, and the conditions of the stirring extraction process include: the stirring mode is mechanical stirring, the temperature is 50-90 ℃, the rotating speed is 100-600rpm, and the time is 20-90min.
6. The method according to claim 1, wherein in step S2, the solid-liquid separation treatment includes: and pumping the solid-liquid mixture into a primary centrifugal machine and a secondary centrifugal machine in sequence for centrifugal separation.
7. The method of claim 6, wherein the primary centrifuge has a rotational speed of 2000-3000rpm and the secondary centrifuge has a rotational speed of 3000-4000rpm;
optionally, the rotational speed of the primary centrifuge is less than the rotational speed of the secondary centrifuge.
8. The method of claim 1, wherein step S1 further comprises: the cleaning agent is diluted to 2-10% by mass with deionized water, and comprises one or more of sodium carboxylate, ammonium carboxylate, sodium alkyl sulfonate, sodium benzene sulfonate and polyether acid amine; wherein the weight average molecular weight of the polyether acid amine is 200-2000;
the inferior hydrocarbon oil comprises one or more of catalytic diesel oil, catalytic slurry oil, catalytic light cycle oil, catalytic heavy cycle oil, recovered light dirty oil and recovered heavy dirty oil.
9. The method according to claim 1, wherein in step S3, the mass fraction of the pH adjuster is 10-20%, and the mass ratio of the pH adjuster to the liquid phase is (0.01-0.03): 1, the pH regulator comprises one or more of hydrochloric acid, sulfuric acid, nitric acid, formic acid, acetic acid, propionic acid, butyric acid, malic acid and citric acid;
the adding amount of the demulsifier is 100-500mg/L relative to the total volume of the liquid phase, and the demulsifier is one or more selected from RP-01 type demulsifier, RP-02 type demulsifier and RP-03 type demulsifier, preferably RP-02 type demulsifier.
10. The method according to claim 1, wherein in step S3, the oil-water separation process includes: mixing the mixed solution in a static mixer, and then separating the water phase and the oil phase in a cleaning agent regenerating device, wherein the operating conditions of the cleaning agent regenerating device comprise: the temperature is 50-90deg.C, and the time is 30-120min.
11. The method of claim 1, wherein the method further comprises: and (3) delivering the oil phase obtained in the step (S3) into an electric desalting device for desalting, and then carrying out recycling.
12. A system for treating sludge using the method of any one of claims 1-11, the system comprising:
the stirring extractor comprises an inferior hydrocarbon oil inlet, a cleaning agent inlet, an oil sludge inlet and a solid-liquid mixture outlet;
the solid-liquid separation device comprises a solid-liquid mixture inlet, a solid phase outlet and a liquid phase outlet; wherein the solid-liquid mixture inlet is connected with the solid-liquid mixture outlet;
the oil-water separation unit comprises a liquid phase inlet, a pH regulator inlet, a demulsifier inlet, a water phase outlet and an oil phase outlet; wherein the liquid phase inlet is connected with the liquid phase outlet, and the water phase outlet is connected with the cleaning agent inlet.
13. The system of claim 12, wherein the oil-water separation unit comprises a static mixer and a cleaning agent regeneration device;
the static mixer comprises the liquid phase inlet, a mixed liquid outlet, a pH regulator inlet and a demulsifier inlet;
the cleaning agent regeneration device comprises a mixed liquid inlet, a water phase outlet and an oil phase outlet;
the mixed liquid outlet is connected with the mixed liquid inlet.
14. The system of claim 12, wherein the system further comprises: an electric desalting device comprising an oil phase inlet and an oil outlet; wherein the oil phase inlet is connected with an oil phase outlet of the cleaning agent regeneration device.
CN202111261896.5A 2021-10-28 2021-10-28 Method and system for treating oil sludge Pending CN116040893A (en)

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CN202111261896.5A CN116040893A (en) 2021-10-28 2021-10-28 Method and system for treating oil sludge

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Application Number Priority Date Filing Date Title
CN202111261896.5A CN116040893A (en) 2021-10-28 2021-10-28 Method and system for treating oil sludge

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CN116040893A true CN116040893A (en) 2023-05-02

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