Advanced treatment system for oil sludge

Abstract

The utility model relates to an oil sludge deep treatment system which comprises a coupling treatment section and a deep treatment section, the coupling treatment section comprises a conditioning tank and a three-phase separation device; the conditioning tank is used for mixing the crude oil sludge with liquid to form a first mixture; the conditioning tank is provided with a first outlet and a liquid injection port; the three-phase separation device is communicated to the first outlet and is used for carrying out three-phase separation on the first mixture; the deep treatment section comprises a deep treatment tank and a two-phase separation device; the deep treatment tank is communicated with a first solid phase outlet of the three-phase separation device and is used for mixing a first solid phase separated by the three-phase separation device with a medicament solution to form a second mixture; the deep treatment tank is provided with a second outlet; the two-phase separation device is communicated to the second outlet and is used for carrying out two-phase separation on the second mixture; a liquid phase outlet of the two-phase separation device is communicated to the liquid injection port so as to convey the separated liquid phase to the conditioning tank; and a second solid phase separated by the two-phase separation device is output for tailing treatment.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of oil sludge treatment, and in particular to an oil sludge advanced treatment system. BACKGROUND

[0002] Oil sludge is a kind of solid waste containing oil produced in the process of oil exploitation, transportation, refining and oily wastewater treatment, and is one of the main pollutants in the process of oil and gas development and storage and transportation. Oil sludge is not only a waste produced in the process of oil field production, but also a resource. If the oil in the oil sludge is not recovered, it will not only waste resources, but also pollute the environment. The composition of oil sludge is complex, specifically, oil, water and solid are layered adsorbed and wrapped, making it difficult to separate oil and solid and oil and water.

[0003] In the prior art, a medicament water washing process can be used to treat oil sludge. However, due to the inhomogeneity of oil sludge, the medicament formula needs to be changed frequently, which is not conducive to stable operation. In order to control the cost, the oil content of the solid phase after the existing process is washed is usually more than 5%. If a lower oil content of the discharged sludge is pursued, the cost will increase sharply. In addition, the wastewater after water washing is composed of oil-in-water emulsion, such as crude oil, fine particles and emulsifiers. The oil content is more than 1000 ppm, and the solid content is about 1%. The emulsified cleaning water containing oil and solid cannot be reused, which makes a large amount of medicament and heat enter the water treatment system with the wastewater, thereby causing great difficulty in water treatment and a large amount of energy loss. CONTENT OF THE UTILITY MODEL

[0004] The present disclosure provides an oil sludge advanced treatment system to solve the problems in the prior art.

[0005] According to a first aspect of the present disclosure, an oil sludge advanced treatment system is provided, comprising a coupling treatment section and an advanced treatment section; wherein the coupling treatment section comprises:

[0006] A conditioning tank is configured to mix crude oil sludge with liquid to form a first mixture; the conditioning tank has a first outlet for outputting the first mixture, and a liquid injection port for inputting liquid;

[0007] A three-phase separation device is connected to the first outlet and configured to perform three-phase separation on the first mixture;

[0008] The advanced treatment section comprises:

[0009] An advanced treatment tank is configured to communicate with the first solid phase outlet of the three-phase separation device, and is configured to mix the first solid phase separated by the three-phase separation device with a medicament solution to form a second mixture; the advanced treatment tank has a second outlet for outputting the second mixture;

[0010] a two-phase separation device, which is connected to the second outlet and configured to perform two-phase separation on the second mixture; a liquid-phase outlet of the two-phase separation device is configured to be connected to the liquid inlet of the conditioning tank to deliver the separated liquid phase to the conditioning tank; and a second solid phase separated by the two-phase separation device is configured to be delivered for tailings treatment.

[0011] In one embodiment of the present disclosure, a dirty oil treatment device is further included; an oil-phase outlet of the three-phase separation device is connected to the dirty oil treatment device, and an oil phase separated by the three-phase separation device is configured to be delivered to the dirty oil treatment device for treatment.

[0012] In one embodiment of the present disclosure, an oil-water separation tank is further included; a water-phase outlet of the three-phase separation device is connected to the oil-water separation tank, and a water phase separated by the three-phase separation device is configured to be delivered to the oil-water separation tank for settlement separation.

[0013] In one embodiment of the present disclosure, the oil-water separation tank includes an overflow oil port located at an upper position and a dirty water port located at a lower position; the overflow oil port is configured to be connected to the dirty oil treatment device, and a floating oil separated by the oil-water separation tank is configured to be delivered to the dirty oil treatment device for treatment.

[0014] In one embodiment of the present disclosure, a dirty water treatment device is further included; the dirty water port is configured to be connected to the dirty water treatment device, and dirty water separated by the oil-water separation tank is configured to be delivered to the dirty water treatment device for treatment.

[0015] In one embodiment of the present disclosure, the advanced treatment tank includes a heating unit configured to heat the temperature of the second mixture to be higher than the freezing point of the crude oil.

[0016] In one embodiment of the present disclosure, the temperature of the liquid phase delivered by the two-phase separation device to the conditioning tank is configured to be higher than the temperature of the crude oil sludge.

[0017] In one embodiment of the present disclosure, a buffer device is further included, which includes a liquid inlet and a liquid outlet; the liquid inlet is connected to the liquid-phase outlet of the two-phase separation device, and the liquid outlet is connected to the liquid inlet of the conditioning tank; and the liquid phase separated by the two-phase separation device is configured to be delivered to the conditioning tank through the buffer device.

[0018] In one embodiment of the present disclosure, the three-phase separation device is a three-phase horizontal screw centrifuge.

[0019] In one embodiment of the present disclosure, the two-phase separation device is a two-phase horizontal screw centrifuge.

[0020] One beneficial effect of the present disclosure is that the first solid phase separated by the three-phase separation device is subjected to deep treatment by setting a deep treatment section, specifically, the reagent added in the deep treatment tank can clean the first solid phase, thereby emulsifying and stripping the oil phase adsorbed therein; the oil content of the second solid phase separated by the two-phase separation device is ≤0.1%, which is superior to the national standard tailings oil content ≤0.3%. The present disclosure reduces the oil content of the tailings by setting a deep treatment section. In addition, the liquid phase separated by the two-phase separation device can be transported back to the conditioning tank, and the liquid phase mainly contains emulsified cleaning water and reagent. The present disclosure avoids the problem that the emulsified cleaning water is difficult to treat by returning the liquid phase; the reagent can be reused, thereby saving costs and reducing energy loss.

[0021] Other features of the present disclosure, and their advantages, will become apparent from the following detailed description of exemplary embodiments of the present disclosure, with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0023] Figure 1 is a structural schematic diagram of the oil sludge deep treatment system of the present disclosure.

[0024] Figure 1 The one-to-one correspondence between the names of the components in the and the reference numerals is as follows:

[0025] 1, conditioning tank; 11, first outlet; 12, liquid injection port; 2, three-phase separation device; 21, first solid phase outlet; 22, water phase outlet; 23, oil phase outlet; 3, deep treatment tank; 31, second outlet; 4, two-phase separation device; 41, liquid phase outlet; 42, second solid phase outlet; 5, waste oil treatment device; 6, oil-water separation tank; 61, overflow oil port; 62, sewage port; 7, sewage treatment device; 8, buffer device; 81, liquid inlet; 82, liquid outlet; 9, reagent adding device. DETAILED DESCRIPTION

[0026] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and values of the components and steps set forth in these embodiments are not limiting to the scope of the present disclosure unless otherwise specifically stated.

[0027] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the present disclosure and its applications or uses.

[0028] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art(s) can not be discussed in detail herein, but should be considered as part of the specification.

[0029] It should be noted that like reference numerals and letters refer to like items throughout the accompanying drawings, and once an item is defined in one drawing, it should not require further discussion in subsequent drawings.

[0030] In the present document, "upper", "lower", "front", "back", "left", "right", and the like are used to indicate relative positional relationships among relevant parts, and do not limit the absolute positions of the relevant parts.

[0031] In the present document, "first", "second", and the like are used only to distinguish between two or more items, and do not indicate importance, order, and the existence of prerequisites.

[0032] In the present document, "equal", "same", and the like are not strictly limited in the mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and allowed in manufacturing or use.

[0033] Reference Figure 1 The present disclosure provides an oil sludge advanced treatment system, which includes a coupling treatment section and an advanced treatment section. The coupling treatment section includes a conditioning tank 1 and a three-phase separation device 2, and the advanced treatment section includes an advanced treatment tank 3 and a two-phase separation device 4. The coupling treatment section and the advanced treatment section jointly constitute a complete process route, wherein the coupling treatment section can preliminarily separate crude oil sludge, and the tailings obtained after preliminary separation have a high oil content and do not meet national standards; therefore, the tailings need to be transported to the advanced treatment section for dosing, and under the action of the dosing agent, the oil content of the tailings is further reduced.

[0034] Crude oil sludge from outside the system can be transported to the conditioning tank 1 by a conveying pipeline, a conveyor, a conveyor belt, or the like. The conditioning tank 1 can have a stirring and heating function. Specifically, the crude oil sludge in the conditioning tank 1 can be heated by an electric heating or a conductive oil heating method, and the crude oil sludge can be heated to a temperature higher than the freezing point of crude oil, so that the solidified crude oil mixed in the crude oil sludge is converted into crude oil with fluidity, thereby facilitating stirring and mixing.

[0035] The conditioning tank 1 is used to mix the oil sludge with liquid to form a first mixture. Specifically, the liquid used for mixing with the oil sludge can be the liquid phase separated from the two-phase separation device 4 in the deep treatment section, which includes emulsified cleaning liquid containing certain residual agents, and the unstable ions in the oil sludge and the oil components can destroy the emulsification state of the cleaning liquid. The residual agents in the cleaning liquid help the oil phase in the oil sludge to desorb, thereby facilitating subsequent separation. The stirring can ensure that each part of the oil sludge is uniformly mixed to form the first mixture, avoiding inconsistent composition and viscosity caused by sedimentation, and thus ensuring that each part of the oil sludge has the same physical and chemical properties during subsequent separation processing, thereby improving the accuracy and efficiency of subsequent separation.

[0036] As shown in Figure 1 The conditioning tank 1 has a first outlet 11 for outputting the first mixture, and a liquid injection port 12 for inputting liquid. The three-phase separation device 2 is connected to the first outlet 11 and is configured to perform three-phase separation on the first mixture. In one specific embodiment of the present disclosure, the three-phase separation device 2 is a three-phase horizontal screw centrifuge. The three-phase separation device 2 is provided with a first solid phase outlet 21, a water phase outlet 22 and an oil phase outlet. After centrifugal separation in the three-phase separation device 2, the first mixture can be separated into an oil phase, a water phase and a first solid phase.

[0037] It should be noted that the separation accuracy of the three-phase separation device 2 is not sufficient to completely separate the three-phase substances in the oil sludge. Specifically, a small amount of oil phase may still be mixed in the water phase and the first solid phase. The oil content of the first solid phase obtained by separating the first mixture in the three-phase horizontal screw centrifuge is about 5%, which does not meet the national standard of tailings oil content ≤0.3%, and therefore the first solid phase needs to be transported to the deep treatment section for further treatment to remove oil.

[0038] The deep treatment tank 3 is configured to communicate with the first solid phase outlet 21 of the three-phase separation device 2, and is configured to mix the first solid phase separated by the three-phase separation device 2 with an agent solution to form a second mixture. The deep treatment tank 3 can have the functions of stirring and heating, for example, a stirring device can be provided in the deep treatment tank 3, which can uniformly mix the agent solution with the first solid phase. Under the action of a specific agent and temperature, the asphaltene colloid contained in the first solid phase is desorbed from the solid phase particles. The agent solution has the ability of strong penetration, strong dispersion and low emulsification, so that the emulsified cleaning liquid after separation is easy to break the oil-water emulsion when it is coupled and conditioned in the conditioning tank 1.

[0039] A dosing port can be provided on the deep treatment tank 3, as shown in Figure 1As shown, the oil sludge deep treatment system further comprises a dosing device 9, which can be a container for storing a medicament solution, and is configured to communicate with the dosing port of the deep treatment tank 3. When it is necessary to supplement the medicament into the deep treatment tank 3, the dosing device 9 can deliver the medicament solution into the deep treatment tank 3.

[0040] In one embodiment of the present disclosure, the deep treatment tank 3 comprises a heating unit configured to heat the temperature of the second mixture to be higher than the freezing point of the crude oil. The heating unit enables the treatment temperature of the deep treatment tank 3 to be raised to be higher than the freezing point of the crude oil, so that the solidified crude oil mixed in the first solid phase is converted into the crude oil with fluidity, so as to facilitate the uniform contact of the medicament with the oil phase, thereby enhancing the emulsification and oil removal capacity of the medicament.

[0041] Specifically, the concentration of the medicament solution reaches above the critical micelle concentration, and the lipophilic end of the medicament molecule can be adsorbed on the surface of the oil sludge particles, with the hydrophilic end facing outward, thereby realizing the wettability transition of the oil sludge particles. After the wettability transition of the oil sludge particles is completed, the oil sludge particles can be dispersed from each other, thereby increasing the probability of the oil phase being emulsified. Since the temperature of the deep treatment tank 3 is higher than the freezing point of the oil product, the oil phase can flow, thereby reducing the adhesion between the oil phase and the solid particles, and further making the oil phase more easily separated from the first solid phase. Under a suitable stirring intensity, the oil phase can be emulsified and peeled off, and the oil phase completes the transition from "oil-solid adsorption" to "oil-water emulsification". A large number of micelles in water participate in the emulsification and oil removal, so as to wrap the oil droplets in the center of the micelles, and the volume of the micelles increases; under the action of van der Waals force, the oil droplet micelles collide with each other, thereby gathering the oil droplets. In addition, the inorganic salt plays a displacement role at the oil-water interface film, thereby accelerating the oil-water separation.

[0042] The deep treatment tank 3 has a second outlet 31 for outputting the second mixture, and the two-phase separation device 4 is communicated to the second outlet 31 and is configured to perform two-phase separation on the second mixture. In one specific embodiment of the present disclosure, the two-phase separation device 4 is a two-phase horizontal screw centrifuge. The two-phase separation device 4 is provided with a liquid phase outlet 41 and a second solid phase outlet 42, and after being centrifuged in the two-phase separation device 4, the second mixture can be separated into a liquid phase and a first solid phase. The liquid phase outlet 41 of the two-phase separation device 4 is configured to be communicated to the liquid injection port 12 to deliver the separated liquid phase to the conditioning tank 1; and the second solid phase separated by the two-phase separation device 4 is configured to be output through the second solid phase outlet 42, and can be specifically output to a tailings shed for tailings treatment. The oil content in the second solid phase is ≤0.1%, which is superior to the national standard of tailings oil content ≤0.3%.

[0043] Further, the second mixture formed by mixing in the deep treatment tank 3 includes the solid phase in the oil sludge and the emulsified cleaning liquid formed by cleaning with the agent. It should be noted that the oil sludge deep treatment system provided by the present disclosure is fully closed and heat-insulated, and under the heating effect of the heating unit, the second mixture in the deep treatment tank 3 has a relatively high temperature, and the liquid (i.e., the emulsified cleaning liquid) separated by the two-phase separation device 4 to the liquid phase outlet 41 can also maintain a relatively high temperature.

[0044] In one specific embodiment of the present disclosure, the temperature of the liquid phase delivered to the conditioning tank 1 by the two-phase separation device 4 is configured to be higher than the temperature of the crude oil sludge. The high-temperature emulsified cleaning liquid is sequentially returned to the conditioning tank 1 through the liquid phase outlet 41 and the liquid injection port 12, and the crude oil sludge can be better stripped from the free state crude oil and the solid phase under the conditioning effect of the hot fine oil removal separation liquid and the heat. The present disclosure returns the high-temperature cleaning liquid, so that heating and adding of the agent are not required in the coupling treatment section, and the heat and the agent are both derived from the deep treatment section, thereby saving the treatment cost while ensuring the separation and treatment effect.

[0045] The present disclosure sets the deep treatment section to perform deep treatment on the first solid phase separated by the three-phase separation device 2, specifically, the agent added in the deep treatment tank 3 can clean the first solid phase to strip the oil phase adsorbed therein; the oil content of the second solid phase separated by the two-phase separation device 4 is ≤0.1%, which is better than the national standard that the oil content of the tailings is ≤0.3%. The present disclosure reduces the oil content of the tailings by setting the deep treatment section. In addition, the liquid phase separated by the two-phase separation device 4 can be delivered back to the conditioning tank 1, and the liquid phase mainly contains emulsified cleaning water and the agent. The present disclosure returns the liquid phase to avoid the problem that the emulsified cleaning water is difficult to treat; the agent and the heat can be reused, thereby saving the cost and reducing the energy loss.

[0046] In one embodiment of the present disclosure, the oil sludge deep treatment system further includes a buffer device 8, which includes a liquid inlet 81 and a liquid outlet 82. The liquid inlet 81 is connected to the liquid phase outlet 41 of the two-phase separation device 4, and the liquid outlet 82 is connected to the liquid injection port 12 of the conditioning tank 1. The liquid phase separated by the two-phase separation device 4 is configured to be delivered to the conditioning tank 1 through the buffer device 8. Specifically, the buffer device 8 can be a buffer water tank that is always open. The liquid flowing out of the liquid phase outlet 41 can first flow into the buffer device 8 through the liquid inlet 81, and then flow to the liquid injection port 12 through the liquid outlet 82 of the buffer device 8, so as to enter the conditioning tank 1.

[0047] The buffer device 8 can prevent the liquid flowing out of the liquid phase outlet 41 from directly flowing into the conditioning tank 1, thereby facilitating the control of the system by the staff, for example, when the liquid outflow of the two-phase separation device 4 is too large, the buffer device 8 can be used to temporarily store the liquid to prevent exceeding the flow threshold of the pipeline and the liquid injection port 12; regardless of the amount of incoming liquid, the liquid outlet 82 can be set to a state capable of uniformly discharging liquid, thereby achieving uniform liquid injection into the conditioning tank 1; or, the amount of liquid discharged from the liquid outlet 82 can also be adjusted in real time according to the amount of oil slurry in the conditioning tank 1, thereby avoiding the imbalance between the oil slurry and the liquid phase in the conditioning tank 1 and ensuring the conditioning effect.

[0048] In an embodiment of the present disclosure, the oil slurry deep treatment system further comprises a waste oil treatment device 5, and the oil phase outlet 23 of the three-phase separation device 2 is communicated to the waste oil treatment device 5, and the oil phase separated by the three-phase separation device 2 is configured to be transported to the waste oil treatment device 5 for treatment. Specifically, the separated oil phase has complex components, and part of the oil can be recycled, so the oil can be purified and treated to meet the recycling standard, and then be reused in industrial production; the oil phase may also be oil that cannot be recycled, and in this case, the oil can be treated in a safe manner to ensure that it does not further pollute the environment.

[0049] In an embodiment of the present disclosure, the oil slurry deep treatment system further comprises an oil-water separation tank 6, and the water phase outlet 22 of the three-phase separation device 2 is communicated to the oil-water separation tank 6, and the water phase separated by the three-phase separation device 2 is configured to be transported to the oil-water separation tank 6 for sedimentation separation. Specifically, as described above, the separation precision of the three-phase separation device 2 is not sufficient to completely separate the three-phase materials in the oil slurry, and a small amount of oil phase may still be mixed in the water phase. Therefore, the separated water phase needs to be first transported to the oil-water separation tank 6 for standing, and then separated by sedimentation using the density difference between oil and water.

[0050] The oil-water separation tank 6 comprises an oil overflow port 61 located at an upper position and a sewage port 62 located at a lower position. It can be understood that the density of oil is lower than that of water, so the separated oil will float upwards and flow out of the oil overflow port 61 located at the upper position of the oil-water separation tank 6; the separated water will sink downwards and flow out of the sewage port 62 located at the lower position of the oil-water separation tank 6.

[0051] The oil overflow port 61 is configured to be communicated to the waste oil treatment device 5, and the floating oil separated by the oil-water separation tank 6 is configured to be transported to the waste oil treatment device 5 for treatment. The floating oil flowing out of the oil overflow port 61 is the small amount of oil phase mixed in the water phase separated by the three-phase separation device 2, and this part of the oil phase can be collected together with the oil phase directly separated by the three-phase separation device 2 to the waste oil treatment device 5 for purification and recycling treatment, or environmentally friendly treatment.

[0052] Further, the oil sludge deep treatment system further comprises a sewage treatment device 7, and a sewage outlet 62 of the oil-water separation tank 6 is configured to be communicated to the sewage treatment device 7, and the sewage separated by the oil-water separation tank 6 is configured to be transported to the sewage treatment device 7 for treatment. The separated sewage usually contains harmful substances and cannot be directly discharged, and therefore needs to be purified by the sewage treatment device 7. Specifically, the sewage treatment device 7 can adopt methods such as sedimentation, filtration, oxidation, and biological degradation to remove harmful substances in the sewage. The purity of the water treated by the sewage treatment device 7 reaches the standard, so that it can be discharged or recycled.

[0053] The above has described the embodiments of the present disclosure, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles, practical application, or technical improvement in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims

1. An oil sludge advanced treatment system, characterized in that, The coupling treatment section and the deep treatment section are included; wherein the coupling treatment section includes: A conditioning tank (1) for mixing crude oil sludge with liquid to form a first mixture; the conditioning tank (1) has a first outlet (11) for outputting the first mixture, and a liquid inlet (12) for inputting liquid; A three-phase separation device (2) connected to the first outlet (11) and configured to perform three-phase separation on the first mixture; The deep treatment section includes: A deep treatment tank (3) configured to communicate with a first solid phase outlet (21) of the three-phase separation device (2), and configured to mix the first solid phase separated by the three-phase separation device (2) with a medicament solution to form a second mixture; the deep treatment tank (3) has a second outlet (31) for outputting the second mixture; A two-phase separation device (4) connected to the second outlet (31) and configured to perform two-phase separation on the second mixture; a liquid phase outlet (41) of the two-phase separation device (4) is configured to communicate with the liquid inlet (12) to transport the separated liquid phase to the conditioning tank (1); the second solid phase separated by the two-phase separation device (4) is configured to be transported for tail residue treatment.

2. The system for advanced treatment of oil sludge according to claim 1, characterized in that, Further including a waste oil treatment device (5); an oil phase outlet (23) of the three-phase separation device (2) is connected to the waste oil treatment device (5), and the oil phase separated by the three-phase separation device (2) is configured to be transported to the waste oil treatment device (5) for treatment.

3. The system for advanced treatment of oil sludge according to claim 2, wherein, Further including an oil-water separation tank (6); a water phase outlet (22) of the three-phase separation device (2) is connected to the oil-water separation tank (6), and the water phase separated by the three-phase separation device (2) is configured to be transported to the oil-water separation tank (6) for sedimentation separation.

4. The system for advanced treatment of oil sludge according to claim 3, wherein, The oil-water separation tank (6) includes an oil overflow port (61) located at an upper position, and a sewage port (62) located at a lower position; the oil overflow port (61) is configured to communicate with the waste oil treatment device (5), and the floating oil separated by the oil-water separation tank (6) is configured to be transported to the waste oil treatment device (5) for treatment.

5. The system for advanced treatment of oil sludge according to claim 4, wherein, Further including a sewage treatment device (7); the sewage port (62) is configured to communicate with the sewage treatment device (7), and the sewage separated by the oil-water separation tank (6) is configured to be transported to the sewage treatment device (7) for treatment.

6. The system for advanced treatment of oil sludge of claim 1, wherein, The deep treatment tank (3) includes a heating unit configured to heat the temperature of the second mixture to be higher than the freezing point of crude oil.

7. The system for advanced treatment of oil sludge according to claim 6, characterized in that, The temperature of the liquid phase transported by the two-phase separation device (4) to the conditioning tank (1) is configured to be higher than the temperature of the crude oil sludge.

8. The system for advanced treatment of oil sludge of claim 1, wherein, Further comprising a buffer device (8), the buffer device (8) comprising a liquid inlet (81) and a liquid outlet (82), the liquid inlet (81) being communicated to the liquid phase outlet (41) of the two-phase separation device (4), and the liquid outlet (82) being communicated to the liquid injection port (12) of the conditioning tank (1); the liquid phase separated by the two-phase separation device (4) is configured to be delivered to the conditioning tank (1) through the buffer device (8).

9. The system for advanced treatment of oil sludge of claim 1, wherein, The three-phase separation device (2) is a three-phase horizontal screw centrifuge.

10. The system for advanced treatment of oil sludge of claim 1, wherein, The two-phase separation device (4) is a two-phase horizontal screw centrifuge.

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