An environmental protection device and process for physical-chemical hot washing of oily sludge

Abstract

The application discloses an oily sludge physical-chemical heat washing environment-friendly device, and relates to the technical field of oily sludge treatment, which comprises a crusher, a rough washing section, a fine washing section, a first rinsing section, a second rinsing section, a sedimentation section and a plate-and-frame filter press connected in sequence by conveying pipes. The plate-and-frame filter press is provided with a sludge discharge port at one end and a water discharge port at the other end. The sludge discharge port is connected with a sludge recovery tank through a sludge discharge pipe, the water discharge port is connected with a sewage recovery tank through a conveying pipe, the sewage recovery tank is connected with a reagent recovery device through a water discharge pipe at the end far from the plate-and-frame filter press, the reagent recovery device is connected with a reagent supplement port of the rough washing section and the fine washing section through a reagent conveying pipe at the end far from the plate-and-frame filter press, and the oil discharge ports of the rough washing section, the fine washing section, the first rinsing section and the second rinsing section are connected with a waste oil recovery tank through a waste oil recovery pipe. The device realizes the three-phase separation of oil, water and sludge through different process sections, realizes the standard treatment of the oil content, and realizes the resource utilization of oil, water and sludge.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oily sludge treatment, and particularly relates to an oily sludge physical-chemical hot washing environment-friendly device and process. BACKGROUND

[0002] Oily sludge refers to sludge mixed with crude oil, oil residue, various finished oil and other heavy oil. Oily sludge does not exist in nature. Oily sludge is a mixture of oil, water, soil and even other pollutants mixed together in the process of oil development, refining, processing, transportation and production. In particular, oily sludge in oil fields has been listed as a dangerous solid waste (HW08) by the state and is managed as a hazardous waste.

[0003] In the oil industry, if the oily sludge is not properly treated, it will pollute the surrounding environment. Harmless and resourceful treatment of oily sludge is a difficult problem that needs to be solved and is also a requirement for sustainable development. Therefore, economic and effective treatment and utilization of oily sludge after reduction have important practical significance for the sustainable development of the oil and petrochemical industry.

[0004] At present, oily sludge treatment and disposal technologies are developing rapidly. Various oily sludge treatment methods such as conditioning-separation-settling, solvent extraction, biological treatment and incineration have been applied to oil and gas fields and refineries in China. The conditioning-separation-settling method has high water content and oil content in the treated sludge, and it is difficult to meet the direct landfill requirements of the treated waste, so this method can only be used as a pretreatment method for oily sludge. The solvent extraction method is easy to operate continuously and remotely, and energy is saved, but the equipment investment is too large and the cost is high. At present, the extraction method has not been widely used in the treatment of oily sludge in oil fields. The biological treatment method uses indigenous microorganisms for treatment, and the oil removal rate is higher and the degradation effect is more obvious with the extension of time, which can meet the emission standard. However, this method occupies a large area and has a long treatment time. The incineration method is the most thorough method for treating oily sludge, but it requires large investment and high treatment cost, and is easy to produce dioxin and other toxic substances, which requires complex flue gas purification measures and increases the treatment cost.

[0005] Therefore, an oily sludge physical-chemical hot washing environment-friendly device and process with good separation effect, low cost, high efficiency and environmental protection are urgently needed. SUMMARY

[0006] Therefore, the present application provides an oily sludge physical-chemical hot washing environment-friendly device and process to solve the problems in the background art.

[0007] In order to achieve the above purpose, the present application provides the following technical scheme:

[0008] The utility model provides an environmental protection device of physical chemistry hot washing of oily sludge, including the crusher that communicates by the feed pipe in proper order, coarse washing section, fine washing section, first rinsing section, second rinsing section, sedimentation section and plate and frame filter press, one end of plate and frame filter press is equipped with the sludge discharge port, and the other end is equipped with the water outlet, sludge discharge port is connected with sludge recovery tank through sludge discharge pipe, the water outlet is connected with sewage recovery tank through the feed pipe, sewage recovery tank is connected with reagent recovery ware through the water discharge pipe far from one end of plate and frame filter press, fine washing section, coarse washing section, rinsing section, sedimentation section all include two symmetrical separation mechanism, be equipped with oil discharge port, reagent inlet and reagent supplementing mouth on separation mechanism, reagent recovery ware is connected with the reagent supplementing mouth of coarse washing section and fine washing section through the reagent pipe far from one end of plate and frame filter press, and the oil discharge port of coarse washing section, fine washing section, first rinsing section and second rinsing section is connected with the dirty oil recovery tank through the dirty oil recovery pipe.

[0009] Further, the separation mechanism includes a base, a motor, a frequency conversion speed reducer, a main body and an air stirring assembly fixedly connected in sequence on the base, a spiral stirring assembly is rotatably connected inside the main body, one end of the spiral stirring assembly is rotatably connected to an inner wall of the main body near the air stirring assembly, the other end of the spiral stirring assembly penetrates through an inner wall of the main body away from the air stirring assembly and extends outward, the output end of the motor is connected to the extending end of the spiral stirring assembly through the frequency conversion speed reducer, a heating device is arranged on the inner bottom wall of the main body, and the air stirring device penetrates through the outer wall of the main body away from the base and is fixedly connected to the heating device.

[0010] Further, the spiral stirring assembly includes a main shaft, one end of the main shaft is rotatably connected to an inner wall of the main body near the air stirring assembly, the other end of the main shaft penetrates through an inner wall of the main body away from the air stirring assembly and is connected to the frequency conversion speed reducer, a plurality of supports are uniformly arranged on the main shaft, and helical blades are fixedly connected to the supports.

[0011] Further, the supports include support one and support two, the support one and the support two are connected in an X shape, and the middle connecting part is fixed to the main shaft.

[0012] Further, the helical blades include helical blade one and helical blade two with opposite rotation directions, the support one is fixedly connected to the helical blade one at both ends, and the support two is fixedly connected to the helical blade two at both ends.

[0013] Further, the heating device is a steam heating pipe, and the steam heating pipe is fixedly arranged on the inner bottom wall of the main body.

[0014] Further, the air stirring assembly comprises an air compressor and an air pipe fixedly arranged on the bottom wall of the main body, the fixed end of the air compressor is fixedly arranged on the base, the output end penetrates through the outer wall of the main body and communicates with the air pipe, and the air pipe is provided with air holes.

[0015] Further, the air holes are located on the lower surface of the air pipe.

[0016] An oil-containing sludge physical-chemical heat washing environment-friendly process, the specific steps are as follows:

[0017] S1: reagents are added into the coarse washing section through the reagent adding port, the oil-containing sludge treated by the crusher is pumped into the coarse washing section through the feeding pipe, the spiral stirring assembly and the air stirring assembly are started, the oil-containing sludge is subjected to reagent soaking, spiral stirring and air stirring to realize preliminary separation of the oil-containing sludge, the separated oil is pumped into the waste oil recovery tank through the oil outlet for collection and reuse, and the remaining oil-containing sludge is pumped into the fine washing section through the feeding pipe;

[0018] S2: reagents are added into the fine washing section through the reagent adding port, the oil-containing sludge pumped into the fine washing section is subjected to reagent soaking, and further separation is realized under the stirring of the spiral stirring assembly and the air stirring assembly, the separated oil is pumped into the waste oil recovery tank through the oil outlet for collection and reuse, and the remaining oil-containing sludge is pumped into the first rinsing section through the feeding pipe;

[0019] S3: clean water is added into the first rinsing section through the reagent adding port, the oil-containing sludge pumped into the first rinsing section is rinsed through the spiral stirring assembly and the air stirring assembly to realize further separation of the oil, water and mud, the separated oil is pumped into the waste oil recovery tank through the oil outlet for collection and reuse, and the remaining oil-containing sludge is pumped into the second rinsing section through the feeding pipe;

[0020] S4: clean water is added into the second rinsing section through the reagent adding port, the oil-containing sludge pumped into the second rinsing section is rinsed through the spiral stirring assembly and the air stirring assembly to realize further separation of the oil, water and mud, the separated oil is pumped into the waste oil recovery tank through the oil outlet for collection and reuse, at this time, the oil has been completely discharged, only the separated water and mud remain, and the water and mud are pumped into the sedimentation section through the feeding pipe;

[0021] S5: a flocculating agent is added into the sedimentation section, under the action of the flocculating agent, the suspended matter in the water pumped into the sedimentation section sinks, and the water and mud are pumped into the plate-and-frame filter press through the feeding pipe;

[0022] S6: the water and mud pumped into the plate-and-frame filter press are subjected to pressure filtration, then the water is pumped into the waste water recovery tank through the water outlet, and the mud is transferred into the sludge recovery tank through the mud discharge pipe;

[0023] S7: the water pumped into the sewage recovery tank is pumped into the medicament recovery device through the drain pipe, the medicament in the water is recovered, the recovered medicament is pumped into the medicine supplementing opening through the medicine conveying pipe for recycling, and the sludge in the sludge recovery tank is transported out after being detected to be qualified.

[0024] The present application has the advantages of:

[0025] The present application realizes the three-phase separation of oil, water and sludge through the coarse washing section, the fine washing section, the first rinsing section, the second rinsing section, the sedimentation section and the plate-and-frame filter press, and realizes the treatment of the oil content up to the standard; the oil discharge openings of the first rinsing section and the second rinsing section are connected with the dirty oil recovery tank through the dirty oil recovery pipe, the oil resources are recycled; the medicament recovery device is connected with the medicine supplementing openings of the coarse washing section and the fine washing section through the medicine conveying pipe at the end away from the plate-and-frame filter press, the water resources are recycled; the sludge discharge opening is connected with the sludge recovery tank through the sludge discharge pipe, the sludge resources are recycled, and the overall resource utilization is realized; the oil-containing sludge in the main body is simultaneously subjected to mechanical stirring and air stirring through the spiral stirring assembly and the air stirring assembly, so that a better separation effect is achieved and the separation efficiency is improved; the spiral blade one and the spiral blade two rotate in opposite directions and can rotate relatively, so that the stirring efficiency of the oil-containing sludge is improved; the air compressor can pump tiny air bubbles into the oil-containing sludge through the air holes on the air pipe and burst at any time, thereby forming a fine local high-pressure bombardment on the oil-containing sludge, so that the oil and water in the surface and gaps of the sludge are rapidly stripped, thereby realizing the preliminary separation of the oil, sludge and water and improving the separation effect; the air holes are located on the lower surface of the air pipe, so as to avoid being blocked by the oil-containing sludge; since the whole process of the present application is at low temperature, the main nutrient components of the sludge in the sludge recovery tank are protected, and the sludge can be used for landscaping, roadbed construction and the like. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on the provided drawings.

[0027] Figure 1 It is a structural schematic diagram of the present application, an oily sludge physical and chemical hot washing environment-friendly device.

[0028] Figure 2 It is a structural schematic diagram of the separation mechanism in the present application.

[0029] Figure 3 It is a structural schematic diagram of the main shaft, the support and the spiral blade in the present application.

[0030] Figure 4 It is a structural schematic diagram of the air pipe and the air hole in the present application.

[0031] In the figure:

[0032] 1-crusher, 2-conveying pipe, 3-coarse washing section, 31-air compressor, 311-air pipe, 312-air hole, 32-main body, 33-motor, 34-variable frequency reducer, 35-main shaft, 36-support one, 37-support two, 38-spiral blade one, 39-spiral blade two, 310-base, 4-fine washing section, 51-first rinsing section, 52-second rinsing section, 6-settling section, 7-plate-and-frame filter press, 71-sludge discharge port, 72-sludge discharge pipe, 73-drainage port, 8-sewage recovery tank, 81-drainage pipe, 9-sludge recovery tank, 10-chemical recovery device, 101-chemical conveying pipe, 11-oil recovery tank, 111-oil recovery pipe, 12-oil discharge port, 13-chemical inlet, 14-chemical supplement inlet. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0034] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above-described accompanying drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units does not necessarily limit to those clearly listed steps or units, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0035] In the present application, the terms "up", "down", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0036] And, the above-mentioned partial terms, in addition to can be used to express the orientation or position relationship, can also be used to express other meanings, for example, the term "upper" can also be used to express a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in this application can be understood according to the specific circumstances.

[0037] In addition, the terms "mounting", "setting", "provided with", "connecting", "connecting", "sleeving" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally configured; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0038] Referring to the accompanying Figures 1-4 The present application discloses a kind of physical chemistry hot washing environmental protection device of oily sludge, including being sequentially communicated by feed pipe 2 breaker 1, rough washing section 3, fine washing section 4, first rinsing section 51, second rinsing section 52, settling section 6 and plate-frame filter press 7, above are pry dress equipment, plate-frame filter press 7 one end is equipped with sludge discharge port 71, the other end is equipped with drain 73, sludge discharge port 71 is connected with sludge recovery tank 9 by sludge discharge pipe 72, mud resource recycling is recycled, drain 73 is connected with sewage recovery tank 8 by feed pipe 2, sewage recovery tank 8 is connected with reagent recovery device 10 by drain pipe 81 far from plate-frame filter press 7 one end, fine washing section 4, rough washing section 3, rinsing section, settling section 6 all include two symmetrical separation mechanisms, separation mechanism is equipped with oil discharge port 12, reagent inlet 13 and reagent supplementing port 14, reagent recovery device 10 is connected with the reagent supplementing port 14 of rough washing section 3 and fine washing section 4 by reagent delivery pipe 101 far from plate-frame filter press 7 one end, water resource recycling is recycled, the oil discharge port 12 of rough washing section 3, fine washing section 4, first rinsing section 51 and second rinsing section 52 is connected with dirty oil recovery tank 11 by dirty oil recovery pipe 111, oil resource recycling is recycled.The three-phase separation target of oil-water mud is completed by rough washing section 3, fine washing section 4, first rinsing section 51, second rinsing section 52, settling section 6 and plate-frame filter press 7, and the oil content rate treatment reaches the standard.

[0039] The separating mechanism comprises the base 310, the motor 33, the frequency conversion speed reducer 34, the main body 32 and the air stirring assembly which are sequentially fixed and connected on the base 310, the screw stirring assembly is rotationally connected in the main body 32, one end of the screw stirring assembly is rotationally connected to the inner wall of the main body 32 near the air stirring assembly, the other end of the screw stirring assembly penetrates through the inner wall of the main body 32 far from the air stirring assembly and extends outward, the output end of the motor 33 is connected to the extending end of the screw stirring assembly through the frequency conversion speed reducer 34, the heating device is arranged on the bottom wall in the main body 32, and the end of the air stirring device far from the base 310 penetrates through the outer wall of the main body 32 and is fixedly connected to the heating device. The mechanical stirring and the air stirring can be simultaneously performed in the main body 32 through the screw stirring assembly and the air stirring assembly, so that the better separating effect is achieved and the separating efficiency is improved.

[0040] The screw stirring assembly comprises the main shaft 35, one end of the main shaft 35 is rotationally connected to the inner wall of the main body 32 near the air stirring assembly, the other end of the main shaft 35 penetrates through the inner wall of the main body 32 far from the air stirring assembly and is connected to the frequency conversion speed reducer 34, a plurality of supports are uniformly arranged on the main shaft 35, and the screw blades are fixedly connected to the supports. The motor 33 can drive the screw blades on the main shaft 35 to rotate, and the frequency conversion speed reducer 34 can control the rotating speed of the main shaft 35 according to requirements.

[0041] The support comprises the support one 36 and the support two 37, the support one 36 and the support two 37 are both X-shaped and connected, and the middle connecting part is fixed to the main shaft 35.

[0042] The screw blades comprise the screw blade one 38 and the screw blade two 39, the two ends of the support one 36 are fixedly connected to the screw blade one 38, the two ends of the support two 37 are fixedly connected to the screw blade two 39, and when the motor 33 drives the main shaft 35 to rotate, the screw blade one 38 and the screw blade two 39 can relatively rotate, so that the stirring efficiency is improved.

[0043] The heating device is a steam heating pipe, and the steam heating pipe is fixedly arranged on the bottom wall in the main body 32.

[0044] The air stirring assembly comprises the air compressor 31 and the air pipe 311, the air pipe 311 is fixedly arranged on the steam heating pipe, the fixed end of the air compressor 31 is fixedly arranged on the base 310, the output end of the air compressor 31 penetrates through the outer wall of the main body 32 and is communicated with the air pipe 311, and the air hole 312 is arranged on the air pipe 311. The air compressor 31 can pump the micro bubbles into the main body 32 through the air hole 312 on the air pipe 311 and burst at any time, so that the fine local high pressure bombardment on the oily sludge is formed, the oil and water in the surface and the gap of the sludge are rapidly stripped, the preliminary separation of the oil sludge and water is realized, and the separating effect is improved.

[0045] The air hole 312 is located on the lower surface of the air pipe 311, so that the air hole is prevented from being blocked by the oily sludge.

[0046] An oil-containing sludge physical-chemical hot washing environment-friendly process, the specific steps are as follows:

[0047] S1: 80% of water is injected into the coarse washing section 3 through the dosing port, and the temperature is raised through the steam heating pipe. When the water temperature rises to 80℃, the reagent is added through the dosing port, and the mass fraction of the reagent is 5-7%. When the oil-containing sludge to be treated contains paraffin, the reagent contains main agent T13W01, auxiliary agent T13W02 and auxiliary agent T13W03, and the mass ratio of main agent T13W01, auxiliary agent T13W02 and auxiliary agent T13W03 is 4-6:1.5-2.5:0.5-1.5; when the oil-containing sludge to be treated does not contain paraffin, the reagent contains main agent T13W01 and auxiliary agent T13W02, and the mass ratio of main agent T13W01 and auxiliary agent T13W02 is 4-6:1.5-2.5; main agent T13W01 contains the following raw materials in the following mass fraction: sodium metasilicate pentahydrate 0.5-4.5%, potassium hydroxide 0.01-0.03%, glycerol 1-3%, organic amine ester 5-8%, heavy sodium carbonate 1-3%, fatty alcohol polyether 0.5-3%, non-ionic surfactant 1-3%, and the balance is water; auxiliary agent T13W02 contains the following raw materials in the following mass fraction: potassium hydroxide 0.1-0.4%, low-foaming surfactant 1-3%, heavy oil soaking degreasing surfactant 1-2.5%, ethylene glycol butyl ether 2-8%, oil and wax removing surfactant 1-3%, and the balance is water; auxiliary agent T13W03 contains the following raw materials in the following mass fraction: potassium hydroxide 0.1-0.5%, carbon removing surfactant 1-4%, penetrant 0.5-1.5%, low-temperature surfactant 1-3%, defoaming agent 0.01-0.03%, surfactant 1-3%, and the balance is water), and the spiral stirring assembly is started to stir. When the temperature of the reagent reaches 70-80℃, the oil-containing sludge treated by the crusher 1 is pumped into the coarse washing section 3 through the feed pipe 2, and the air stirring assembly is started. In this embodiment, the stirring time is 30-60 minutes. The oil-containing sludge is preliminarily separated by reagent soaking, spiral stirring assembly and air stirring assembly. The separated oil is pumped into the waste oil recovery tank 11 through the oil outlet 12 for collection and reuse, and the remaining oil-containing sludge is pumped into the fine washing section 4 through the feed pipe 2;

[0048] S2: The reagent in S1 is added to the fine washing section 4 through the dosing port. The oil-containing sludge pumped into the fine washing section 4 is soaked in the reagent and further separated under the stirring of the spiral stirring assembly and the air stirring assembly. In this embodiment, the stirring time is 20-40 minutes. The separated oil is pumped into the waste oil recovery tank 11 through the oil outlet 12 for collection and reuse, and the remaining oil-containing sludge is pumped into the first rinsing section 51 through the feed pipe 2;

[0049] S3: adding clean water into the first rinsing section 51 through the dosing port, pumping the oily sludge into the first rinsing section 51, rinsing through the spiral stirring assembly and the air stirring assembly to further separate the oil and sludge, pumping the separated oil into the waste oil recovery tank 11 through the oil outlet 12 for recycling, and pumping the remaining oily sludge into the second rinsing section 52 through the conveying pipe 2;

[0050] S4: adding clean water into the second rinsing section 52 through the dosing port, pumping the oily sludge into the second rinsing section 52, rinsing through the spiral stirring assembly and the air stirring assembly to further separate the oil and sludge, pumping the separated oil into the waste oil recovery tank 11 through the oil outlet 12 for recycling, at this time, the oil has been completely discharged, only the separated water and sludge are left, and the water and sludge are pumped into the sedimentation section 6 through the conveying pipe 2;

[0051] S5: adding a flocculating agent into the sedimentation section 6, under the action of the flocculating agent, the suspended matter in the water pumped into the sedimentation section 6 sinks, and the water and sludge are pumped into the plate-and-frame filter press 7 through the conveying pipe 2;

[0052] S6: performing pressure filtration on the water and sludge pumped into the plate-and-frame filter press 7, then pumping the water into the waste water recovery tank 8 through the water outlet 73, and pumping the sludge into the sludge recovery tank 9 through the sludge outlet pipe 72;

[0053] S7: pumping the water in the waste water recovery tank 8 into the agent recovery device 10 through the water outlet pipe 81 to recover the agent in the water, pumping the recovered agent into the agent supplementing port 14 through the agent conveying pipe 101 for recycling, and transporting the sludge in the sludge recovery tank 9 out after passing the detection, since the whole process of the application is at low temperature, the main nutrient components of the sludge in the sludge recovery tank are protected, and the sludge can be used for landscaping, roadbed construction and the like.

[0054] The application can realize resource utilization, the treated sludge has an oil content of less than 3%, and the treatment effect is qualified.

[0055] The above only describes the preferred embodiments of the application and is not used to limit the application, and the application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement and the like within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. An environmentally friendly physicochemical thermal washing device for oily sludge, characterized in that, The system includes a crusher (1), a coarse washing section (3), a fine washing section (4), a first rinsing section (51), a second rinsing section (52), a settling section (6), and a plate and frame filter press (7), all connected sequentially by a conveying pipe (2). The plate and frame filter press (7) has a sludge discharge port (71) at one end and a drain outlet (73) at the other end. The sludge discharge port (71) is connected to a sludge recovery tank (9) via a sludge discharge pipe (72). The drain outlet (73) is connected to a wastewater recovery tank (8) via a conveying pipe (2). The wastewater recovery tank (8), located away from the plate and frame filter press (7), is connected to a chemical recovery device (10) via a drain pipe (81). The fine washing section (4), coarse washing section (3), rinsing section and settling section (6) each include two symmetrically arranged separation mechanisms. The separation mechanism is provided with an oil discharge port (12), a chemical inlet (13) and a chemical replenishment port (14). The end of the chemical recovery device (10) away from the plate and frame filter press (7) is connected to the chemical replenishment port (14) of the coarse washing section (3) and the fine washing section (4) through a chemical delivery pipe (101). The oil discharge ports (12) of the coarse washing section (3), the fine washing section (4), the first rinsing section (51) and the second rinsing section (52) are connected to the sludge recovery tank (11) through the sludge recovery pipe (111). The separation mechanism includes a base (310) and a motor (33), a frequency converter (34), a main body (32), and an air stirring assembly that are fixedly connected in sequence on the base (310). A spiral stirring assembly is rotatably connected inside the main body (32). One end of the spiral stirring assembly is rotatably connected to the inner wall of the main body (32) near the air stirring assembly, and the other end passes through the inner wall of the main body (32) away from the air stirring assembly and extends outward. The output end of the motor (33) is connected to the extended end of the spiral stirring assembly through the frequency converter (34). A heating device is provided on the bottom wall inside the main body (32). The end of the air stirring assembly away from the base (310) passes through the outer wall of the main body (32) and is fixedly connected to the heating device. The spiral stirring assembly includes a main shaft (35), one end of which is rotatably connected to the inner wall of the main body (32) near the air stirring assembly, and the other end passes through the inner wall of the main body (32) away from the air stirring assembly and is connected to the frequency converter (34). Multiple supports are evenly arranged on the main shaft (35), and spiral blades are fixedly connected to the supports. The bracket includes a first bracket (36) and a second bracket (37), both of which are connected in an X-shape, with the middle connecting part fixed to the main shaft (35); The helical blades include a helical blade one (38) and a helical blade two (39) with opposite rotation directions. The two ends of the bracket one (36) are fixedly connected to the helical blade one (38), and the two ends of the bracket two (37) are fixedly connected to the helical blade two (39).

2. The environmental protection device for physicochemical thermal washing of oily sludge according to claim 1, characterized in that, The heating device is a steam heating pipe, which is fixedly installed on the bottom wall inside the main body (32).

3. The environmental protection device for physicochemical thermal washing of oily sludge according to claim 2, characterized in that, The air stirring assembly includes an air compressor (31) and an air pipe (311). The air pipe (311) is fixedly mounted on the steam heating pipe. The fixed end of the air compressor (31) is fixedly mounted on the base (310), and the output end passes through the outer wall of the main body (32) and connects to the air pipe (311). The air pipe (311) is provided with an air hole (312).

4. The environmental protection device for physicochemical thermal washing of oily sludge according to claim 3, characterized in that, The vent (312) is located on the lower surface of the vent (311).

5. An environmentally friendly physicochemical thermal washing process for oily sludge, characterized in that, The environmental protection device for physicochemical thermal washing of oily sludge, as described in any one of claims 1-4, is implemented through the following specific steps: S1: Add the agent to the coarse washing section (3) through the dosing port. When the oily sludge to be treated contains paraffin, the agent includes the main agent T13W01, the auxiliary agent T13W02 and the auxiliary agent T13W03. The mass ratio of the main agent T13W01, the auxiliary agent T13W02 and the auxiliary agent T13W03 is 4-6:1.5-2.5:0.5-1.

5. When the oily sludge to be treated does not contain paraffin, the agent includes the main agent T13W01 and the auxiliary agent T13W02. The mass ratio of T13W01 to auxiliary agent T13W02 is 4–6:1.5–2.5; the main agent T13W01 contains the following raw materials in the following mass fractions: sodium metasilicate pentahydrate 0.5–4.5%, potassium hydroxide 0.01–0.03%, glycerol 1–3%, organic amine ester 5–8%, sodium heavy carbonate 1–3%, fatty alcohol polyether 0.5–3%, nonionic surfactant 1–3%, and the balance being water; the auxiliary agent T13W02 contains the following raw materials in the following mass fractions. The additives are: potassium hydroxide 0.1-0.4%, low-foaming surfactant 1-3%, heavy oil soaking and degreasing surfactant 1-2.5%, ethylene glycol butyl ether 2-8%, degreasing and dewaxing surfactant 1-3%, and the balance being water; Additive T13W03 contains the following raw materials in the following mass fractions: potassium hydroxide 0.1-0.5%, carbon removal surfactant 1-4%, penetrant 0.5-1.5%, low-temperature surfactant 1-3%, defoamer 0.01-0.03%, and surface... 1-3% surfactant and the remainder is water. The oily sludge treated by the crusher (1) is pumped into the coarse washing section (3) through the conveying pipe (2). At the same time, the spiral stirring component and the air stirring component are turned on. The oily sludge is initially separated by soaking in the agent, the spiral stirring component and the air stirring component. The separated oil is pumped into the sludge recovery tank (11) through the oil outlet (12) for collection and reuse. The remaining oily sludge is pumped into the fine washing section (4) through the conveying pipe (2). S2: Add chemicals into the fine washing section (4) through the chemical addition port. The oily sludge pumped into the fine washing section (4) is soaked in the chemicals and further separated under the stirring of the spiral stirring component and the air stirring component. The separated oil is pumped into the sludge recovery tank (11) through the oil discharge port (12) for collection and reuse. The remaining oily sludge is pumped into the first rinsing section (51) through the conveying pipe (2). S3: Add clean water to the first rinsing section (51) through the dosing port, and pump the oily sludge into the first rinsing section (51). The oily sludge is rinsed by the spiral stirring assembly and the air stirring assembly, so that the oil and sludge are further separated. The separated oil is pumped into the waste oil recovery tank (11) through the oil discharge port (12) for collection and reuse. The remaining oily sludge is pumped into the second rinsing section (52) through the conveying pipe (2). S4: Add clean water to the second rinsing section (52) through the dosing port, and pump the oily sludge into the second rinsing section (52). The oil and sludge are rinsed by the spiral stirring assembly and the air stirring assembly, so that the oil and sludge are further separated. The separated oil is pumped into the sludge recovery tank (11) through the oil outlet (12) for collection and reuse. At this time, all the oil has been discharged, and only the separated water and sludge remain. The separated water and sludge are pumped into the settling section (6) through the conveying pipe (2). S5: Add flocculant to the settling section (6). Under the action of flocculant, the suspended matter in the water pumped into the settling section (6) settles down, and the water and mud are pumped into the plate and frame filter press (7) through the conveying pipe (2). S6: The water and mud pumped into the plate and frame filter press (7) are filtered, and then the water is pumped into the sewage recovery tank (8) through the drain outlet (73), and the mud is transferred into the sludge recovery tank (9) through the sludge discharge pipe (72). S7: The water pumped into the sewage recycling tank (8) is pumped into the chemical recovery unit (10) through the drain pipe (81) for chemical recovery in the water. The recovered chemical is pumped into the replenishment port (14) through the delivery pipe (101) for recycling. The sludge in the sludge recycling tank (9) is transported out after passing the test.

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