Oil-containing sludge reduction treatment device and method

Abstract

The application provides an oil-containing sludge reduction treatment device and method, and relates to the technical field of oil-containing sludge treatment. The device comprises a shell, a dehydration chamber and a deoiling chamber arranged in the shell in sequence, the dehydration chamber and the deoiling chamber being communicated, feed inlets and discharge outlets being arranged at both ends of the shell and communicated with the dehydration chamber and the deoiling chamber respectively, dehydration capillary holes and deoiling capillary holes being arranged in the side walls of the dehydration chamber and the deoiling chamber and communicated with the dehydration chamber, and heating components being arranged in the side walls of the dehydration chamber and the deoiling chamber. A stirring and conveying mechanism is arranged in the shell and used for stirring and conveying materials in the dehydration chamber and the deoiling chamber. The device solves the problems of great difficulty in solid-liquid separation, complex operation, high cost, large occupied area and limited application range of oil-containing sludge with different component characteristics in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of oily sludge treatment technology, and more specifically, relates to an oily sludge reduction treatment device and method. Background Technology

[0002] Oily sludge is a mixture of mud and water containing petroleum components generated during oil extraction, transportation, refining, chemical processing, and wastewater treatment. It is classified as hazardous solid waste, and direct discharge causes serious pollution to water bodies, the atmosphere, and soil. Oily sludge has a complex composition, exhibiting an oil-water emulsion system, making it difficult and costly to treat. Therefore, it is necessary to reduce the volume of oily sludge in oil fields and petroleum refining plants.

[0003] Currently, oily sludge reduction treatment devices typically employ centrifugation for solid-liquid separation. These devices are complex, difficult to operate, and costly. Furthermore, oily sludge contains valuable oil resources, and current oily sludge reduction treatment devices consume significant energy for oil separation and recovery, requiring multi-stage centrifugation, which further increases treatment costs. Optimizing oily sludge reduction treatment devices to reduce the difficulty and cost of oil-water separation and improve separation efficiency is crucial for achieving more economical oily sludge reduction treatment.

[0004] Oily sludge varies significantly in properties due to its diverse origins. Oil tank bottom sludge often contains a high oil content, oily sludge and sand from oil fields typically have a high solids content, while sludge generated during petroleum refining wastewater treatment often has a high water content. For oily sludge with different properties, simultaneous oil-water separation in an integrated system increases the difficulty of separation, especially for oily sludge with high water content, resulting in a decrease in the purity of the recovered oil. Therefore, improving oily sludge reduction treatment equipment and methods to broaden the applicability of the equipment is an important direction for improving oily sludge reduction.

[0005] CN113173688B discloses a pyrolysis recovery system and method for oily sludge. The system consists of a preheater, a frying dryer, a pyrolysis furnace, a waste heat recovery boiler, a primary oil spray cooler, and a secondary oil spray cooler. While high-boiling-point substances are separated to recover oil through high-temperature pyrolysis, the oil recovery cost is high and economically unsustainable. Furthermore, the remaining low-boiling-point recovered oil and cooling water require further separation via an oil-water separator, which is complex and its cost needs further reduction.

[0006] CN114031255A discloses a process for recycling and treating oil sludge from oil rolling. The apparatus includes a tank, a storage tank, a settling tank, a mixing centrifuge tank, and an oil-water separation tank. Although oil-water separation and recycling are achieved, the process involves settling and centrifugation, and the centrifugation process generates oil sludge, requiring solid-liquid separation. This results in high separation and recycling costs, and the operating costs of the apparatus need further reduction. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing an oily sludge reduction treatment device and method, which solves the problems of difficult solid-liquid separation, complex operation, high cost, large footprint, and limited applicability to oily sludge with different compositional characteristics in the existing oily sludge reduction treatment process.

[0008] To achieve the above objectives, the present invention provides an oily sludge reduction treatment device, the device comprising:

[0009] The housing has a dehydration chamber and an oil removal chamber arranged sequentially inside, which are connected to each other. The two ends of the housing are respectively provided with an inlet communicating with the dehydration chamber and an outlet communicating with the oil removal chamber. The side walls of the dehydration chamber and the oil removal chamber are respectively provided with dehydration capillary channels and oil removal capillary channels communicating with the dehydration chamber. Heating components are provided inside the side walls of the dehydration chamber and the oil removal chamber.

[0010] A stirring and conveying mechanism is disposed inside the housing and is used to stir and convey the materials in the dehydration chamber and the deoiling chamber.

[0011] Oily sludge and demulsifier can enter the dewatering chamber through the inlet. Under the action of the heating element, the temperature in the dewatering chamber rises to a suitable temperature for dewatering. The oily sludge is dewatered in the dewatering chamber, producing water and dewatered material. Under the action of the stirring and conveying mechanism, the material is agitated and conveyed towards the discharge port. The water can be absorbed and discharged through the dewatering capillary channels. The dewatered material then enters the deoiling chamber. Under the action of the heating element, the temperature in the deoiling chamber rises to a suitable temperature for deoiling. The dewatered material is deoiled in the deoiling chamber, producing oil and solid products. Under the action of the stirring and conveying mechanism, the dewatered material continues to agitate and can be discharged through the discharge port. The oil can be absorbed and discharged through the deoiling capillary channels. This achieves segmented dewatering and deoiling for the reduction of oily sludge volume. It can effectively reduce the volume of oily sludge of various properties, improving the applicability of the oily sludge reduction treatment device. Furthermore, the device adopts an integrated design, has a compact structure, occupies a small area, is simple to operate, facilitates oil and water recovery, and has low operating costs.

[0012] The heating element can be an integrated structure or a split structure. The dehydration chamber and the deoiling chamber can be equipped with heating elements to obtain different heating temperatures. Alternatively, segmented frequency conversion heating elements can be used to heat the dehydration chamber and the deoiling chamber with different power. Similarly, the stirring and conveying mechanism can be an integrated stirring and conveying mechanism or two stirring and conveying mechanisms.

[0013] Optionally, the outer side of the outer wall of the shell is provided with a water collection tank communicating with the dehydration capillary channel and an oil collection tank communicating with the oil removal capillary channel, and the bottom of the water collection tank and the oil collection tank are respectively provided with a first drain port and a second drain port.

[0014] The water collection tank and oil collection tank are used to collect the water and oil discharged through the dehydration capillary channel and the oil removal capillary channel, respectively.

[0015] Optionally, a separation water tank is provided below the water collection tank. The separation water tank is connected to the water collection tank through a connecting channel. A filter membrane stack is provided in the connecting channel. The filter membrane stack is permeable to water and blocks oil. A third drain port is provided at the bottom of the separation water tank.

[0016] The water in the collection tank still contains a small amount of oil. The separation tank is connected to the bottom of the collection tank through a filter membrane stack. The water in the collection tank enters the separation tank through the filter membrane stack, while the small amount of oil in the collection tank cannot pass through the filter membrane stack and remains in the collection tank. The separation tank and filter membrane stack are designed to separate the water produced by dehydration from the small amount of oil contained therein, thereby improving the purity of the water collected in the separation tank.

[0017] Optionally, a partition is provided inside the water collection tank, which divides the interior of the water collection tank into a first space and a second space that are connected at the top. The first space is connected to the dehydration capillary channel, and the first drain outlet is located on the side wall of the second space.

[0018] A small amount of oil floats on the surface of the water in the collection tank. Water containing a small amount of oil is discharged through the dehydration capillary channels into the first space. The partition allows the oil to flow through the top of the partition into the second space, thus achieving the separation and storage of the oil.

[0019] Optionally, the first drain port is connected to the oil collection tank via a connecting pipe.

[0020] The oil in the second space can be discharged into the oil collection tank through connecting pipes for unified collection.

[0021] Optionally, a first valve is provided in the first drain port or on the connecting pipeline, and a first level gauge is provided in the second space.

[0022] The first level gauge can be linked with the first valve for control. Based on the detection result of the first level gauge, the opening of the first valve can be automatically controlled to discharge the oil in the second space in a timely manner.

[0023] Optionally, the pore size of the dehydration capillary channels and the deoiling capillary channels is 0.01-2 micrometers.

[0024] In this invention, the capillary channels can be formed by any method. According to one specific embodiment, the capillary channels are formed by stamping; according to another specific embodiment, the capillary channels are capillary holes with protective sleeves embedded during equipment processing, which can connect the oily sludge end and the liquid collection tank end; according to yet another embodiment, the sidewall of the first chamber with capillary channels is integrally formed using a channel model, for example, by integrally forming using a channel model during steel rolling; according to yet another embodiment, the sidewall of the first chamber with capillary channels is processed by spray etching, making the device easy to manufacture.

[0025] Optionally, the volume ratio of the dehydration capillary channels relative to the total volume of the sidewall of the dehydration chamber is 0.05-4%, preferably 1-2%; the volume ratio of the deoiling capillary channels relative to the total volume of the sidewall of the deoiling chamber is 0.05-4%, preferably 1-2%.

[0026] When manufacturing the device of the present invention, the parameters of the dehydration capillary channels and the deoiling capillary channels can be adjusted, including but not limited to pore size and volume ratio (i.e., open porosity).

[0027] Optimal pore size combined with optimal volume ratio can achieve better dehydration and deoiling effects.

[0028] Optionally, the inner wall of the dehydration capillary channel is provided with a first hydrophilic coating, and the inner wall of the oil removal capillary channel is provided with a first hydrophobic coating.

[0029] According to a preferred embodiment of the present invention, the water droplet contact angle of the first hydrophilic coating is in the range of 2-25°, preferably 5-10°, which enhances the separation and recovery of water by the dehydration capillary channels; the water droplet contact angle of the first hydrophobic coating is in the range of 95-130°, preferably 105-115°, which enhances the separation and recovery of oil by the deoiling capillary channels.

[0030] Optionally, the bottom of the housing is provided with a support foot, the length of which is adjustable so that the housing can be tilted so that the first end of the housing where the feed inlet is located is lower than the second end of the housing where the discharge outlet is located.

[0031] Multiple support frames form a device support structure. The support legs can adopt a telescopic structure so that their length can be adjusted. The height of both ends of the device can be adjusted. According to the material conveying direction, the material conveying presents a certain uphill inclination angle, which promotes the recovery of water and oil under the action of dehydration capillary channels and deoiling capillary channels, respectively.

[0032] According to a preferred embodiment of the present invention, the dehydration chamber and the deoiling chamber inside the shell are both cylindrical and coaxially arranged. The angle between the axis of the dehydration chamber and the deoiling chamber and the horizontal direction is the device tilt angle, which ranges from 1 to 30°, preferably from 10 to 20°.

[0033] Optionally, a second hydrophilic coating is provided on the inner wall of the dehydration chamber, and a plurality of oil droplet separation and blocking structures are provided at one end of the dehydration capillary channel near the dehydration chamber, the oil droplet separation and blocking structures including:

[0034] The first barrier plate has its lower end connected to the inner wall of the dehydration chamber via a first bracket. The upper end of the first barrier plate is inclined toward the direction close to the feed inlet. The first barrier plate blocks at least one dehydration capillary channel in the vertical direction. Multiple first liquid outlets are formed in the first bracket.

[0035] A second hydrophobic coating and a third hydrophilic coating are respectively disposed on the side of the first barrier plate near the discharge port and the side of the first barrier plate near the inlet port.

[0036] Due to the tilt angle of the device, the water in the dehydration chamber flows from the outlet to the inlet along the bottom of the chamber. During this process, due to the presence of the second hydrophilic coating, a small amount of oil floats on the upper side of the water. As the water flows, it passes through the first liquid outlet, while the oil contacts the second hydrophobic coating. The water passing through the first liquid outlet enters the dehydration capillary channel and is collected. The oil flows upward along the second hydrophobic coating, forming an oil film and quickly leaves, making it difficult to enter the dehydration capillary channel. The third hydrophilic coating adsorbs water when it comes into contact with water and materials, forming a water film. The water film flows downward and enters the dehydration capillary channel blocked by the first baffle plate, where it is collected. The oil droplet separation and blocking structure reduces the amount of oil entering the dehydration capillary channel and improves the purity of the recovered water.

[0037] Optionally, a third hydrophobic coating is provided on the inner wall of the oil removal chamber, and a plurality of water droplet separation and blocking structures are provided at one end of the oil removal capillary channel near the oil removal chamber, the water droplet separation and blocking structures including:

[0038] The second barrier plate has its upper end connected to the inner wall of the deoiling chamber via a second bracket. The upper end of the second barrier plate is inclined toward the direction close to the feed inlet, and the second barrier plate blocks at least one deoiling capillary channel in the vertical direction. Multiple second liquid outlets are formed inside the second bracket.

[0039] A fourth hydrophobic coating and a fourth hydrophilic coating are respectively disposed on the side of the second barrier plate near the feed inlet and the side of the second barrier plate near the discharge outlet.

[0040] A water droplet separation barrier structure is installed in the deoiling chamber. The oil in the deoiling chamber flows from the outlet to the inlet along the bottom of the chamber. During this process, due to the presence of the third hydrophobic coating, water droplets are repelled, and oil droplets adhere to the bottom of the deoiling chamber to form an oil film. A small amount of water is above the oil. During the oil flow, it passes through the second liquid outlet, while the water contacts the fourth hydrophilic coating. The oil passing through the second liquid outlet enters the deoiling capillary channel and is collected. The water flows upward along the fourth hydrophilic coating to form a water film and leaves quickly, making it difficult to enter the deoiling capillary channel. The fourth hydrophobic coating adsorbs oil when it comes into contact with oil and materials to form an oil film. The oil film flows downward and enters the deoiling capillary channel blocked by the second barrier plate and is collected. By setting up the water droplet separation barrier structure, the amount of water entering the deoiling capillary channel can be reduced, thus achieving the recovery of high-purity oil.

[0041] Optionally, the water droplet contact angle of the second hydrophilic coating ranges from 2 to 25°, and the water droplet contact angle of the third hydrophobic coating ranges from 95 to 130°.

[0042] Optionally, the height of the first liquid outlet and the second liquid outlet is 0.5-3 micrometers.

[0043] The present invention also provides a method for reducing the volume of oily sludge, utilizing the above-mentioned oily sludge reduction treatment device, the method comprising:

[0044] Oily sludge and demulsifier are fed into the dewatering chamber through the feed inlet;

[0045] The material in the dehydration chamber is heated, stirred and conveyed, and the first liquid generated in the dehydration chamber is discharged through the dehydration capillary channel, and the dehydrated material enters the deoiling chamber.

[0046] The dehydrated material in the deoiling chamber is heated, stirred and conveyed, and the second liquid in the deoiling chamber is discharged through the deoiling capillary channels;

[0047] The solid products generated in the degreasing chamber are discharged through the discharge port.

[0048] This method separates and recovers oil and water resources in stages. The oily sludge to be treated can be high water content oily sludge, high oil content oily sludge, or high solids content oily sludge. It has a wide range of treatment applications and strong adaptability.

[0049] Optionally, the method further includes collecting the first liquid and the second liquid, and performing oil-water separation on the first liquid.

[0050] The water separated in the dehydration chamber contains a small amount of oil. Oil-water separation can improve the purity of the collected water, and the separated oil can be fed into the second liquid for reuse.

[0051] Optionally, the demulsifier is selected from at least one of sodium lignosulfonate, tetrasodium ethylenediaminetetraacetate, polyethylene terephthalate, polyquaternium salt, polyether polyquaternium salt, terephthalic acid, glycerol, nonylphenol polyoxyethylene ether, tetraphenylborate amine, polyacrylate, dimethyl silicone oil, sodium dodecylbenzenesulfonate, sodium polyacrylate, carbon tetrachloride, butanediol, hexadecyltrimethylammonium bromide, and alkylphenol polyoxyethylene ether.

[0052] Optionally, the amount of demulsifier added relative to the oily sludge is 0.5-10 g / L, which is adjusted according to the moisture content and properties of the oily sludge being treated, preferably 2-5 g / L.

[0053] Optionally, the temperature in the dehydration chamber is 30-120℃, preferably 40-50℃; the temperature in the oil removal chamber is 30-120℃, preferably 70-80℃.

[0054] The temperature inside the dehydration chamber and the oil removal chamber affects the dehydration effect in the dehydration chamber and the oil removal effect in the oil removal chamber.

[0055] Optionally, the residence time of the oily sludge in the dewatering chamber is 0.5-6 hours, preferably 1-3 hours, and the residence time of the oily sludge in the deoiling chamber is 0.5-6 hours, preferably 1-3 hours.

[0056] By appropriately selecting the dewatering time in the dewatering chamber and the oil removal time in the oil removal chamber, the volume reduction treatment effect of oily sludge can be improved.

[0057] Optionally, when the inner wall of the dehydration capillary channel is provided with a first hydrophilic coating and the inner wall of the deoiling capillary channel is provided with a first hydrophobic coating, the water droplet contact angle of the first hydrophilic coating is in the range of 2-25°, preferably 5-10°, and the water droplet contact angle of the first hydrophobic coating is in the range of 95-130°, preferably 105-115°.

[0058] Optionally, the housing is tilted such that the first end of the housing where the inlet is located is lower than the second end of the housing where the outlet is located.

[0059] Optionally, the inclination angle of the housing relative to the horizontal plane is 1-30°, preferably 10-20°.

[0060] According to a specific embodiment of the present invention, the method for reducing the volume of oily sludge includes the following steps:

[0061] S1: Feeding

[0062] The oily sludge to be treated is mixed with a certain proportion of demulsifier and fed into the dewatering chamber through the feed inlet;

[0063] S2: Dehydration

[0064] Inside the dehydration chamber, the stirring and conveying mechanism continuously and efficiently agitates the material and propels it toward the deoiling chamber. Under the action of the heating components, the material inside the dehydration chamber is heated and kept warm.

[0065] S3: Moisture Recovery

[0066] In the dehydration chamber, the material that has undergone demulsification treatment achieves solid-liquid separation. By controlling the temperature, water is separated from the oily sludge. The bottom of the dehydration chamber is equipped with dehydration capillary channels, which collect water in the dehydration chamber through self-priming and enter the water collection tank. The water is further filtered by the filter membrane stack at the bottom of the water collection tank to further purify the oil and collect it into the separation water tank. The water is then discharged through the third drain port for reuse.

[0067] S4: Oil removal

[0068] The dehydrated material, which has been in the dehydration chamber for a certain period of time, is pushed into the deoiling chamber by the stirring and conveying mechanism. Inside the deoiling chamber, the stirring and conveying mechanism continues to slowly stir the dehydrated material and push it toward the discharge port. The heating components inside the deoiling chamber keep the dehydrated material at different temperatures, thereby separating the oil from the dehydrated material.

[0069] S5: Oil Recycling

[0070] After the material dehydrated in the dehydration chamber is further separated into oil by high-temperature demulsification, the oil in the dehydration chamber is collected by self-priming through the bottom dehydration capillary channel and enters the oil collection tank. The oil separated by filtration in the water collection tank is periodically introduced into the oil collection tank through the connecting pipeline and periodically discharged through the second drain port at the bottom of the oil collection tank for reuse.

[0071] S6: Discharge

[0072] Solid products that remain in the deoiling chamber for a certain period of time are discharged through the outlet by the stirring and conveying mechanism. The generated waste gas is discharged through the gas outlet on the shell that is connected to the deoiling chamber for purification.

[0073] The method has the following technical advantages: (1) The device recovers water and oil respectively by setting up a dehydration chamber and an oil removal chamber, and separates and recovers oil and water resources in stages, which improves the applicability of the oily sludge reduction treatment device. The oily sludge to be treated can be high water and oily sludge or high oil and oily sludge. It has a wide range of treatment and strong adaptability.

[0074] (2) Oil and water resources are recovered by self-priming through dehydration capillary channels and deoiling capillary channels, thereby reducing the oil and water recovery cost of the oily sludge reduction treatment device.

[0075] (3) The setting of water droplet separation barrier structure and oil droplet separation barrier structure improves the separation and recovery effect of water resources and oil resources of the device. The purity of the recovered water resources and oil resources is significantly improved, exceeding 98.5% and 99.5% respectively.

[0076] This invention provides an apparatus and method for reducing the volume of oily sludge. The beneficial effects are as follows: The apparatus has a dewatering chamber and an oil removal chamber arranged sequentially within the shell along the material conveying direction. A stirring and conveying mechanism is installed in each chamber to convey the material from the inlet to the outlet. The oily sludge and demulsifier are fed into the dewatering chamber through the inlet, and a heating element provides a suitable temperature for dewatering. Under the stirring and conveying action of the stirring and conveying mechanism, the sludge is agitated and moved, allowing it to be dewatered within the dewatering chamber, separating the water... Water is absorbed and discharged through dehydration capillary channels for collection. The dehydrated material then enters the deoiling chamber, where it continues to be agitated and moved by a stirring and conveying mechanism. A heating element provides a suitable temperature for deoiling, allowing the oily sludge to undergo deoiling within the chamber. The separated oil is absorbed and discharged through the deoiling capillary channels for collection. Solid products are discharged through the outlet for further processing, and generated gas is discharged through the vent for purification. In a preferred embodiment, this oily sludge reduction treatment device... The casing is tilted so that the first end of the housing where the feed inlet is located is lower than the second end of the housing where the discharge outlet is located. An oil droplet separation barrier structure is provided at the end of the dehydration capillary channel near the dehydration chamber, and a water droplet separation barrier structure is provided at the end of the deoiling capillary channel near the deoiling chamber. The oil droplet separation barrier structure has a second hydrophilic coating on the inner wall of the dehydration chamber. The upper end of its first barrier plate is tilted towards the feed inlet and vertically blocks at least one dehydration capillary channel. A second hydrophobic coating and a second hydrophilic coating are respectively provided on the sides of the first barrier plate near the discharge outlet and near the feed inlet. The bottom of the dehydration chamber... The water in the first part flows from the second end to the first end. The water can flow through the first liquid outlet in the first support and enter the dehydration capillary channel near the feed inlet side of the first liquid outlet. Due to the setting of the second hydrophobic coating and the second hydrophilic coating, a small amount of oil is blocked by the first barrier plate during the flow process and forms an oil film on the second hydrophobic coating and leaves quickly. When the second hydrophilic coating comes into contact with water, it adsorbs water and forms a water film that flows into the dehydration capillary channel blocked by the first barrier plate. The setting of the oil droplet separation barrier structure can improve the purity of the collected water. Similarly, the setting of the water droplet separation barrier structure can improve the purity of the collected oil.

[0077] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0078] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0079] Figure 1 A schematic diagram of an oily sludge reduction treatment device according to an embodiment of the present invention is shown.

[0080] Figure 2 and Figure 3 They are shown respectively Figure 1 Schematic diagram of cross-sectional structure at two locations.

[0081] Figure 4 A front view schematic diagram of an oil droplet separation and barrier structure of an oily sludge reduction treatment device according to an embodiment of the present invention is shown.

[0082] Figure 5 A side view schematic diagram of the oil droplet separation and blocking structure of an oily sludge reduction treatment device according to an embodiment of the present invention is shown.

[0083] Figure 6 A flowchart of a method for reducing the volume of oily sludge according to an embodiment of the present invention is shown.

[0084] Explanation of reference numerals in the attached figures:

[0085] 1. Shell; 2. Dehydration chamber; 3. Deoiling chamber; 4. Inlet; 5. Outlet; 6. Dehydration capillary channel; 7. Deoiling capillary channel; 8. First stirring and conveying mechanism; 9. Second stirring and conveying mechanism; 10. First heating component; 11. Second heating component; 12. Air outlet; 13. Heat-conducting layer; 14. First drive motor; 15. Second drive motor; 16. First sealing component; 17. Second sealing component; 18. Water collection tank; 19. Oil collection tank; 20. First drain outlet; 21. Second drain outlet; 22. Third drain outlet; 23. First valve; 24. Second valve; 25. Third valve; 26. Connecting pipeline; 27. Separation water tank; 28. Filter membrane stack; 29. ​​Partition plate; 30. Support foot; 31. First barrier plate; 32. First bracket; 33. First liquid outlet; 34. Second hydrophobic coating; 35. Third hydrophilic coating. Detailed Implementation

[0086] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0087] Example 1

[0088] like Figures 1 to 5 As shown, this embodiment provides an oily sludge reduction treatment device, which includes:

[0089] The shell 1 has a dehydration chamber 2 and an oil removal chamber 3 arranged sequentially inside it. The dehydration chamber 2 and the oil removal chamber 3 are connected. The two ends of the shell 1 are respectively provided with an inlet 4 communicating with the dehydration chamber 2 and an outlet 5 communicating with the oil removal chamber 3. The side walls of the dehydration chamber 2 and the oil removal chamber 3 are respectively provided with dehydration capillary channels 6 and oil removal capillary channels 7 communicating with the dehydration chamber 2. Heating components are provided in the side walls of the dehydration chamber 2 and the oil removal chamber 3.

[0090] The mixing and conveying mechanism is located inside the housing 1 and is used to mix and convey the materials in the dehydration chamber 2 and the deoiling chamber 3.

[0091] In this embodiment, as Figure 1 As shown, a tapered structure is provided in the middle of the shell 1, and a connecting port is formed in the middle of the tapered structure. The dehydration chamber 2 and the oil removal chamber 3 are connected through the connecting port; Figure 2 As shown, the dehydration chamber 2 is equipped with three first stirring and conveying mechanisms 8 arranged in a triangular pattern to enhance the stirring ability of the material in the dehydration chamber 2 and improve the dehydration performance. Furthermore, a first heating element 10 is installed inside the side wall of the dehydration chamber 2 for heating the dehydration chamber 2. Figure 3 As shown, a second stirring and conveying mechanism 9 is provided in the deoiling chamber 3, and a second heating component 11 is provided in the side wall of the deoiling chamber 3 for heating the deoiling chamber 3; at the same time, an air outlet 12 is provided on the top of the deoiling chamber 3, and an exhaust valve is provided on the air outlet 12.

[0092] Furthermore, such as Figures 1 to 3As shown, a heat-conducting layer 13 is provided on the inner wall of the shell 1, and the heating component passes through the heat-conducting layer 13. The heat-conducting layer 13 can improve the heat conductivity and heating efficiency. In this embodiment, the heat-conducting layer 13 is heat-conducting oil. Therefore, the shell 1 includes an inner shell and an outer shell, and a sandwich is formed between the inner shell and the outer shell. The heat-conducting oil fills the sandwich. At this time, the dehydration capillary channel 6 and the deoiling capillary channel 7 are both opened on the inner shell. The outer shell is provided with through holes at the corresponding positions and the surrounding area of ​​the through holes is connected to the inner shell through the cylinder so that the liquid discharged through the dehydration capillary channel 6 and the deoiling capillary channel 7 can flow out. The first stirring and conveying mechanism 8 includes a first rotating shaft, which is rotatably inserted into the dehydration chamber 2. One end of the first rotating shaft is connected to a first drive motor 14. The outer periphery of the first rotating shaft is provided with a first stirring and conveying blade. The first stirring and conveying mechanism 8 drives the first rotating shaft through the first drive motor 14 to drive the first stirring and conveying blade to rotate. The first stirring and conveying blade can stir the material at the same time. The material is conveyed from near the inlet 4 to near the outlet 5. The first stirring and conveying blade adopts an auger blade. The residence time of the material in the dewatering chamber 2 can be controlled by controlling the rotation speed of the first rotating shaft and the shape of the first stirring and conveying blade. One end of the first rotating shaft passes through the side wall of the housing 1 and is connected to the first drive motor 14 located outside the housing 1. The outer periphery of the first rotating shaft is provided with a first sealing component 16 connected to the housing 1. The second stirring and conveying mechanism 9 includes a second rotating shaft, which rotates through the deoiling chamber 3. One end of the second rotating shaft is connected to the second drive motor 15. The outer periphery of the second rotating shaft is provided with second stirring and conveying blades. One end of the second rotating shaft passes through the side wall of the housing 1 and is connected to the second drive motor 15 located outside the housing 1. The outer periphery of the second rotating shaft is provided with a second sealing component 17 connected to the housing 1. The operating principle of the second stirring and conveying mechanism 9 is the same as that of the first stirring and conveying mechanism 8, and will not be described again here.

[0093] In this embodiment, both the first drive motor 14 and the second drive motor 15 are variable frequency motors, which can adjust the output power and regulate the residence time of materials in the dehydration chamber 2 and the deoiling chamber 3 by adjusting the speed.

[0094] In this embodiment, the power of the first heating element 10 and the second heating element 11 is adjustable, which facilitates the adjustment of the temperature in the dehydration chamber 2 and the oil removal chamber 3.

[0095] The outer side of the outer wall of the shell 1 is provided with a water collection tank 18 that communicates with the dehydration capillary channel 6 and an oil collection tank 19 that communicates with the oil removal capillary channel 7. The bottom of the water collection tank 18 and the oil collection tank 19 are respectively provided with a first drain port 20 and a second drain port 21.

[0096] Below the water collection tank 18 is a separation water tank 27, which is connected to the water collection tank 18 through a connecting channel. A filter membrane stack 28 is installed in the connecting channel. The filter membrane stack 28 is permeable to water and blocks oil. A third drain port 22 is installed at the bottom of the separation water tank 27.

[0097] In this embodiment, the filter membrane stack 28 exhibits superhydrophilicity, with a water droplet contact angle ranging from 0.5 to 10°, enabling selective permeation of water and isolation of oil, thereby improving the purity of the water resources recovered in the separation tank 27.

[0098] A partition 29 is provided inside the water collection tank 18, which divides the interior of the water collection tank 18 into a first space and a second space that are connected at the top. The first space is connected to the dehydration capillary channel 6, and the first drain outlet 20 is located on the side wall of the second space.

[0099] The first drain port 20 is connected to the oil collection tank 19 via the connecting pipe 26.

[0100] A first valve 23 is installed inside the first drain port 20 or on the connecting pipe 26, and a first level gauge is installed in the second space.

[0101] In this embodiment, a PLC control system is also included. The PLC control system receives the detection result of the first liquid level gauge. When the liquid level detected by the first liquid level gauge is higher than the first set liquid level, the PLC control system automatically controls the first valve 23 to open and discharge the oil to the oil collection tank 19.

[0102] In this embodiment, a second valve 24 is provided on the second drain port 21, and a third valve 25 is provided on the third drain port 22.

[0103] The pore size of the dehydration capillary channel 6 and the deoiling capillary channel 7 is 0.01-2 micrometers.

[0104] The volume of the dehydration capillary channel 6 relative to the total volume of the sidewall of the dehydration chamber 2 is 0.05-4%, preferably 1-2%; the volume of the deoiling capillary channel 7 relative to the total volume of the sidewall of the deoiling chamber 3 is 0.05-4%, preferably 1-2%.

[0105] The inner wall of the dehydration capillary channel 6 is provided with a first hydrophilic coating, and the inner wall of the deoiling capillary channel 7 is provided with a first hydrophobic coating.

[0106] The bottom of the housing 1 is provided with a support foot 30. The length of the support foot 30 is adjustable so that the housing 1 can be tilted so that the first end of the housing 1 where the feed inlet 4 is located is lower than the second end of the housing 1 where the discharge outlet 5 is located.

[0107] like Figure 4 and Figure 5As shown, an oil droplet separation and blocking structure is provided at one end of the dehydration capillary channel 6 near the dehydration chamber 2. The oil droplet separation and blocking structure includes:

[0108] The second hydrophilic coating is applied to the inner wall of the dehydration chamber.

[0109] The first baffle plate 31 has its lower end connected to the inner wall of the dewatering chamber 2 via the first bracket 32. The upper end of the first baffle plate 31 is inclined toward the direction close to the feed inlet 4. The first baffle plate 31 blocks at least one dewatering capillary channel 6 in the vertical direction. Multiple first liquid outlets 33 are formed in the first bracket 32.

[0110] The second hydrophobic coating 34 and the third hydrophilic coating 35 are respectively disposed on the side of the first barrier plate 31 near the discharge port 5 and the side of the first barrier plate 31 near the feed port 4.

[0111] A water droplet separation barrier structure is provided at one end of the degreasing capillary channel 7 near the degreasing chamber 3. The water droplet separation barrier structure includes:

[0112] The third hydrophobic coating is applied to the inner wall of the oil removal chamber.

[0113] The second baffle plate 29 has its upper end connected to the inner wall of the deoiling chamber 3 via the second bracket. The upper end of the second baffle plate 29 is inclined toward the direction close to the feed inlet 4, and the second baffle plate 29 blocks at least one deoiling capillary channel 7 in the vertical direction. Multiple second liquid outlets are formed in the second bracket.

[0114] The fourth hydrophobic coating and the fourth hydrophilic coating are respectively disposed on the side of the second barrier plate 29 near the feed inlet 4 and the side of the second barrier plate 29 near the discharge outlet 5.

[0115] The heights of the first liquid outlet 33 and the second liquid outlet are 0.5-3 micrometers.

[0116] Example 2A-2J

[0117] The oily sludge was reduced in volume using the oily sludge reduction treatment device described in Example 1, and the steps were as follows: Figure 6 As shown.

[0118] Example 2A

[0119] The oily sludge to be treated has a moisture content of 20%, an oil content of 68%, and a solids content of 12%. The treatment method is as follows:

[0120] S1: Feeding

[0121] The oily sludge to be treated is added to the dewatering chamber 2 through the feed inlet 4 at a flow rate of 15 kg / h. The demulsifier selected is tetraphenylborate amine, hexadecyltrimethylammonium bromide and alkylphenol polyoxyethylene ether in a ratio of 1:1:2, and the addition amount is 2.8 g per liter of oily sludge.

[0122] S2: Dehydration

[0123] The prepared material is heated by the first heating element 10 in the dehydration chamber 2, and the material temperature is 45°C. It is stirred and conveyed by the first stirring and conveying mechanism 8, so that the material stays in the dehydration chamber 2 for 90 minutes.

[0124] S3: Moisture Recovery

[0125] Water separated from solids after demulsification in dehydration chamber 2 is self-absorbed and recovered through dehydration capillary channels 6. The average pore size of dehydration capillary channels 6 is 0.86 micrometers, and they occupy 1.2% of the bottom volume of dehydration chamber 2. The first hydrophilic coating on the inner wall of dehydration capillary channels 6 has a water droplet contact angle of 8°. An oil droplet separation barrier structure is provided at the dehydration capillary channels 6, as shown in the diagram. Figure 4 and Figure 5 As shown, in Figure 4The material moves from left to right. Due to the device's tilt angle of 17°, the water at the bottom of the dehydration chamber 2 moves from right to left. The bottom wall of the dehydration chamber 2 is coated with a second hydrophilic coating, with a water droplet contact angle of 8°. The first barrier plate 31 of the oil droplet separation barrier structure has different coatings on both sides: a second hydrophobic coating 34 on the right side of the first barrier plate 31 and a third hydrophilic coating 35 on the left side. The first barrier plate 31 and the bottom wall of the dehydration chamber 2 are connected and supported by a first support 32. A first liquid outlet 33 is located between the first supports 32. When the liquid phase at the bottom of the dehydration chamber 2 moves from right to left due to gravity, the second hydrophilic coating on the bottom wall of the dehydration chamber 2 causes it to lie horizontally on the surface of the bottom wall, while the oil droplets move above the water. When they reach the first liquid outlet 33, due to the small height of the first liquid outlet 33 (0.7 micrometers), the water layer quickly passes through the first liquid outlet 33, while the oil droplets... The oil droplets are blocked by the first barrier plate 31 and form an oil film on the second hydrophobic coating 34, quickly leaving the bottom wall surface of the dehydration chamber 2. The third hydrophilic coating 35 on the left side of the first barrier plate 31 adsorbs water when in contact with the material, forming a water film that flows into the dehydration capillary channel 6 for recycling. Through the setting of the oil droplet separation barrier structure, the purity of the water recovered in the dehydration chamber 2 is improved, and the water is introduced into the water collection tank 18. The water in the water collection tank 18 is further filtered through the filter membrane stack 28 to achieve oil-water separation. The high-purity water enters the separation water tank 27 through the filter membrane stack 28 coated with the hydrophilic coating. The water droplet contact angle of the hydrophilic coating on the filter membrane stack 28 is 3°, and the pore size of the filter membrane stack 28 is 0.3 micrometers. The separation water tank 27 is equipped with a second liquid level gauge. The third valve 25 is opened and closed periodically according to the second set liquid level by the PLC control system, and the water is discharged through the third drain port 22 for reuse. The purity of the recycled water is higher than 98.7%.

[0126] S4: Oil removal

[0127] After being dehydrated in the dehydration chamber 2, the dehydrated material enters the deoiling chamber 3 and is heated by the second heating component 11. The temperature of the dehydrated material is 75°C. The material is then stirred and conveyed by the second stirring and conveying component, so that the residence time of the dehydrated material in the deoiling chamber 3 is maintained at 120 minutes.

[0128] S5: Oil Recycling

[0129] After high-temperature demulsification in the deoiling chamber 3, the solid-liquid separated oil is self-absorbed and recovered through the deoiling capillary channel 7. The average pore size of the deoiling capillary channel 7 is 1.06 micrometers, and the deoiling capillary channel 7 occupies 2.36% of the bottom volume of the deoiling chamber 3. The third hydrophobic coating on the bottom wall of the deoiling chamber 3 has a water droplet contact angle of 108°. The bottom wall of the deoiling chamber 3 is equipped with a water droplet separation barrier structure, which works similarly to the oil droplet separation barrier structure, promoting the high-purity recovered oil to enter the oil collection tank 19. In the water collection tank 18, the oil is separated by a baffle 29, allowing the top of the baffle 29 to flow into the second space on the right side of the water collection tank 18. The first valve 23 is opened and closed periodically, and the oil is introduced into the oil collection tank 19 through the connecting pipe 26. The oil collection tank 19 is equipped with a third level gauge. The second valve 24 is opened and closed periodically through the PLC control system, and high-quality oil resources are recovered through the second drain port 21. The purity of the recovered oil resources is higher than 99.7%.

[0130] S6: Discharge

[0131] The solid product after being processed in the deoiling chamber 3 is pushed by the second stirring and conveying mechanism 9 and discharged through the discharge port 5. The entire device is continuously fed and discharged. The processed solid product has a moisture content of 6%, an oil content of 8%, a solid content of 86%, and a weight reduction rate of 86%. The waste gas generated during the high-temperature demulsification process is discharged to the purification unit through the gas outlet 12.

[0132] Example 2B

[0133] The oily sludge to be treated has a moisture content of 86%, an oil content of 8%, and a solids content of 6%. The treatment method is as follows:

[0134] S1: Feeding

[0135] The oily sludge to be treated is added to the dewatering chamber 2 through the feed inlet 4 at a flow rate of 25 kg / h. The demulsifier is selected as terephthalic acid and glycerol in a ratio of 3:1, and the addition amount is 1.6 g per liter of oily sludge.

[0136] S2: Dehydration

[0137] The prepared material is heated by the first heating element 10 in the dehydration chamber 2, and the material temperature is 50°C. It is stirred and conveyed by the first stirring and conveying mechanism 8, so that the residence time of the material in the dehydration chamber 2 is maintained at 180 minutes.

[0138] S3: Moisture Recovery

[0139] Water separated from solids after demulsification in dehydration chamber 2 is self-absorbed and recovered through dehydration capillary channels 6. The average pore size of dehydration capillary channels 6 is 1.35 micrometers, and they occupy 3.2% of the bottom volume of dehydration chamber 2. A second hydrophilic coating on the bottom wall of dehydration chamber 2 has a water droplet contact angle of 8°. An oil droplet separation barrier structure is provided on the bottom wall of dehydration chamber 2 to improve the purity of water recovery within the chamber. The water is then introduced into a water collection tank 18, where it is further... Oil-water separation is achieved through the filter membrane stack 28. High-purity water enters the separation tank 27 through the filter membrane stack 28 coated with a hydrophilic coating. The water droplet contact angle of the hydrophilic coating on the filter membrane stack 28 is 5°, and the pore size of the filter membrane stack 28 is 0.7 micrometers. The separation tank 27 is equipped with a second level gauge. The PLC control system periodically switches the third valve 25 according to the second set level and discharges water through the third drain port 22 for reuse. The purity of the recycled water is higher than 99.3%.

[0140] S4: Oil removal

[0141] After being dehydrated in the dehydration chamber 2, the dehydrated material enters the deoiling chamber 3, where it is heated by the second heating component 11 to a temperature of 70°C. The material is then stirred and conveyed by the second stirring and conveying component to maintain the residence time of the dehydrated material in the deoiling chamber 3 at 80 minutes.

[0142] S5: Oil Recycling

[0143] After high-temperature demulsification and solid-liquid separation in the deoiling chamber 3, the oil is self-absorbed and recovered through the deoiling capillary channel 7. The average pore size of the deoiling capillary channel 7 is 0.62 micrometers, and the deoiling capillary channel 7 occupies 1.1% of the bottom volume of the deoiling chamber 3. The third hydrophobic coating on the bottom wall of the deoiling chamber 3 has a water droplet contact angle of 108°. The bottom wall of the deoiling chamber 3 is equipped with a water droplet separation barrier structure. The recovered oil enters the oil collection tank 19. The oil in the water collection tank 18 is separated by the partition 29 so that the oil in the tank flows from the top into the right side of the water collection tank 18. The first valve 23 is opened and closed periodically to introduce the oil into the oil collection tank 19 through the connecting pipe 26. The oil collection tank 19 is equipped with a third level gauge. The second valve 24 is opened and closed periodically through the PLC control system, and high-quality oil resources are recovered through the second drain port 21. The purity of the recovered oil resources is higher than 99.5%.

[0144] S6: Discharge

[0145] The solid product after being processed in the deoiling chamber 3 is pushed by the second stirring and conveying mechanism 9 and discharged through the discharge port 5. The entire device is continuously fed and discharged. The processed solid product has a water content of 7%, an oil content of 1%, a solid content of 92%, and a weight reduction rate of 93%. The waste gas generated during the high-temperature demulsification process is discharged to the purification unit through the gas outlet 12.

[0146] Example 2C

[0147] The oily sludge to be treated has a moisture content of 23%, an oil content of 29%, and a solids content of 48%. The treatment method is as follows:

[0148] S1: Feeding

[0149] The oily sludge to be treated is added to the dewatering chamber 2 through the feed inlet 4 at a flow rate of 10 kg / h. The demulsifier is polyethylene terephthalate, and the addition amount is 3.6 g per liter of oily sludge.

[0150] S2: Dehydration

[0151] The prepared material is heated by the first heating element 10 in the dehydration chamber 2, and the material temperature is 55°C. It is stirred and conveyed by the first stirring and conveying mechanism 8, so that the residence time of the solid material in the dehydration chamber 2 is maintained at 70 minutes.

[0152] S3: Moisture Recovery

[0153] Water separated from solids after demulsification in dehydration chamber 2 is self-absorbed and recovered through dehydration capillary channels 6. The average pore size of dehydration capillary channels 6 is 1.12 micrometers, and they occupy 1.8% of the bottom volume of dehydration chamber 2. A second hydrophilic coating on the bottom wall of dehydration chamber 2 has a water droplet contact angle of 8°. An oil droplet separation barrier structure is provided on the bottom wall of dehydration chamber 2 to improve the purity of water recovery within the chamber. The water is then introduced into a water collection tank 18, where it is further... Oil-water separation is achieved through the filter membrane stack 28. High-purity water enters the separation tank 27 through the filter membrane stack 28 coated with a hydrophilic coating. The water droplet contact angle of the hydrophilic coating on the filter membrane stack 28 is 10°, and the pore size of the filter membrane stack 28 is 0.2 micrometers. The separation tank 27 is equipped with a second level gauge. The third valve 25 is periodically opened and closed according to the second set level by the PLC control system, and the water is discharged through the third drain port 22 for reuse. The purity of the recycled water is higher than 98.7%.

[0154] S4: Oil removal

[0155] After being dehydrated in the dehydration chamber 2, the dehydrated material enters the deoiling chamber 3 and is heated by the second heating component 11. The temperature of the dehydrated material is 83°C. The material is then stirred and conveyed by the second stirring and conveying component, so that the residence time of the dehydrated material in the deoiling chamber 3 is maintained at 130 minutes.

[0156] S5: Oil Recycling

[0157] After high-temperature demulsification and solid-liquid separation in the deoiling chamber 3, the oil is self-absorbed and recovered through the deoiling capillary channel 7. The average pore size of the deoiling capillary channel 7 is 0.32 micrometers, and the deoiling capillary channel 7 occupies 1.65% of the bottom volume of the deoiling chamber 3. The third hydrophobic coating on the bottom wall of the deoiling chamber 3 has a water droplet contact angle of 108°. The bottom wall of the deoiling chamber 3 is equipped with a water droplet separation barrier structure to improve the purity of the recovered oil. The recovered oil enters the oil collection tank 19. The oil in the water collection tank 18 is separated by the partition 29 so that the oil in the tank flows from the top into the right side of the water collection tank 18. The first valve 23 is opened and closed periodically to introduce the oil into the oil collection tank 19 through the connecting pipe 26. The oil collection tank 19 is equipped with a third level gauge. The second valve 24 is opened and closed periodically through the PLC control system, and high-quality oil resources are recovered through the second drain port 21. The purity of the recovered oil resources is higher than 99.6%.

[0158] S6: Discharge

[0159] The solid product after being processed in the deoiling chamber 3 is pushed by the second stirring and conveying mechanism 9 and discharged through the discharge port 5. The entire device is continuously fed and discharged. The processed solid product has a water content of 6%, an oil content of 6%, a solid content of 88%, and a weight reduction rate of 45%. The waste gas generated during the high-temperature demulsification process is discharged to the purification unit through the gas outlet 12.

[0160] Examples 2D1-2D9

[0161] The apparatus and method with the same structure as in Example 2A were used, but the residence time of the oily sludge in the dewatering chamber 2 and the deoiling chamber 3 during the operation was adjusted. The parameters of the oily sludge after treatment corresponding to different residence times are shown in Table 1 below:

[0162] Table 1

[0163]

[0164] The comparison revealed that the residence time of oily sludge in dewatering chamber 2 and deoiling chamber 3 affects the oily sludge reduction effect. Maintaining an appropriate residence time can achieve low-cost and efficient oily sludge reduction, improving the treatment efficiency and effect of the oily sludge reduction treatment device. When the residence time of oily sludge in both dewatering chamber 2 and deoiling chamber 3 is higher than 30 minutes, the oily sludge reduction rate can be maintained above 75%. When the residence time of oily sludge in both dewatering chamber 2 and deoiling chamber 3 is higher than 60 minutes, the oily sludge reduction rate can be maintained above 80%.

[0165] Examples 2E1-2E17

[0166] The apparatus and method with the same structure as in Example 2A were used, but the heating temperature and demulsifier addition amount of the oily sludge in the dewatering chamber 2 and deoiling chamber 3 were adjusted during the operation. The parameters of the oily sludge after treatment corresponding to different operating parameters are shown in Table 2 below:

[0167] Table 2

[0168]

[0169] Comparative analysis revealed that adjusting the demulsifier content can improve the reduction effect of oily sludge. Controlling the demulsifier content enables low-cost and efficient reduction of oily sludge. Reasonable temperature control within the dewatering chamber 2 and the deoiling chamber 3 can improve the purity of oil and water recovery, thereby enhancing the device's recovery capacity. When the material temperature in the dewatering chamber 2 is 40-50℃, the material temperature in the deoiling chamber 3 is 70-80℃, and the demulsifier dosage is 2-5 g / L of oily sludge, an oily sludge reduction rate of over 85% can be achieved, while the water recovery purity is higher than 98.5%, and the oil recovery purity is higher than 99.5%.

[0170] Examples 2F1-2F3

[0171] The apparatus and method used are the same as in Example 2A, but the purity of water and oil resources recovered varies depending on whether an oil droplet separation barrier structure and a water droplet separation barrier structure are used during the control operation. Table 3 shows the results of water and oil resource recovery corresponding to the use of different oil droplet separation barrier structures and water droplet separation barrier structures.

[0172]

[0173] The comparison revealed that the design and use of oil droplet separation barrier structures and water droplet separation barrier structures significantly improved the oil-water separation effect, maintaining the purity of recovered water and oil at over 98.5% and 99.5% respectively, thereby improving the purity of recovered oil and water resources and enhancing the economic efficiency of the oily sludge reduction treatment device.

[0174] Examples 2G1-2G13

[0175] The apparatus and method used are the same as those in Example 2A, but the coating materials of the inner coating of the dehydration capillary channel 6 in the dehydration chamber 2 and the inner coating of the inner coating of the oil removal capillary channel 7 in the oil removal chamber 3 are different, resulting in different water droplet contact angles. The results of water and oil resource recovery purity corresponding to different water droplet contact angles are shown in Table 4 below:

[0176]

[0177] Comparative analysis revealed that controlling the hydrophilic properties of the first hydrophilic coating within the dehydration capillary channel 6 and the hydrophobic properties of the first hydrophobic coating within the oil removal capillary channel 7 significantly improves the purity of oil-water resource separation, thereby enhancing the device's separation performance and efficiency. When the water droplet contact angle of the dehydration capillary channel coating is between 5 and 10°, the purity of the recovered water is high, maintaining above 98.5%; when the water droplet contact angle of the oil removal capillary channel coating is between 105 and 115°, the purity of the recovered oil is high, maintaining above 99.5%.

[0178] Examples 2H1-2H9

[0179] The apparatus and method used are the same as those in Example 2A, but the pore size and proportion of the dewatering capillary channels 6 in the dewatering chamber 2 and the deoiling capillary channels 7 in the deoiling chamber 3 are different. The results of the oil sludge reduction rate corresponding to different capillary channel parameters are shown in Table 5 below:

[0180]

[0181] The comparison revealed that maintaining a certain capillary pore ratio (>0.05%) can ensure a high oil sludge reduction rate, and controlling an appropriate capillary pore size (<2) is also crucial. m) can also improve the recovery effect of oil and water resources and increase the reduction rate of oily sludge.

[0182] Examples 2I1-2I8

[0183] The apparatus and method used are the same as those in Example 2A, but with different inclination angles. The angle between the material's forward direction and the horizontal direction is considered positive, while the angle between the opposite direction of the material's forward direction and the horizontal direction is considered negative. The results of oil sludge reduction rate and oil-water separation purity corresponding to different inclination angles are shown in Table 6 below:

[0184]

[0185] Comparative analysis revealed that within a reasonable inclination angle range (1-30°), the device can simultaneously improve the reduction of oily sludge and the purity of oil and water resource separation and recovery, thus enhancing the device's operation and treatment efficiency. When the inclination angle is between 10-20°, the device achieves better treatment results, ensuring an oily sludge reduction rate of over 85% while maintaining a water recovery purity of over 98.5% and an oil recovery purity of over 99.5%.

[0186] Examples 2J1-2J14

[0187] The apparatus and method used are the same as those in Example 2A, but the height dimensions of the first liquid outlet 33 of the oil droplet separation barrier structure and the second liquid outlet of the water droplet separation barrier structure are different. The oil-water separation purity results corresponding to different dimensions are shown in Table 7 below:

[0188]

[0189] Comparative analysis revealed that adjusting the height of the first and second liquid outlets (33 and 33) effectively improves the purity of oil-water resource separation and recovery, and enhances the separation performance and efficiency of the oily sludge reduction treatment device. When the height of the first liquid outlet is between 0.5 and 3.0 micrometers, the purity of water resource recovery can reach over 98.0%, and when the height of the second liquid outlet is between 0.5 and 3.0 micrometers, the purity of oil resource recovery can reach over 99.0%.

[0190] Compared with CN113173688B and CN114031255A, this embodiment adopts a segmented oil-water separation and recovery method. By setting up water droplet separation and oil droplet separation barrier structures, the purity of the separated and recovered water and oil resources is significantly improved, with purities exceeding 98% and 98.5%, respectively. Furthermore, the segmented separation and recovery of oil and water is achieved through capillary self-priming, significantly reducing costs. This embodiment employs segmented demulsification and high-temperature treatment of oily sludge, significantly expanding the processing range of the oily sludge reduction treatment device, reducing the difficulty of oil-water separation and recovery, improving the adaptability to the oily sludge to be treated, enhancing the universality of the device, and strengthening the promotion and application of the oily sludge reduction treatment device.

[0191] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A device for reducing the volume of oily sludge, characterized in that, The device includes: The housing has a dehydration chamber and an oil removal chamber arranged sequentially inside, which are connected to each other. The two ends of the housing are respectively provided with an inlet communicating with the dehydration chamber and an outlet communicating with the oil removal chamber. The side walls of the dehydration chamber and the oil removal chamber are respectively provided with dehydration capillary channels and oil removal capillary channels communicating with the dehydration chamber. Heating components are provided inside the side walls of the dehydration chamber and the oil removal chamber. A stirring and conveying mechanism is disposed inside the housing and is used to stir and convey the materials in the dehydration chamber and the deoiling chamber.

2. The oily sludge reduction treatment device according to claim 1, characterized in that, The outer side of the outer wall of the shell is provided with a water collection tank communicating with the dehydration capillary channel and an oil collection tank communicating with the oil removal capillary channel. The bottom of the water collection tank and the oil collection tank are respectively provided with a first drain port and a second drain port.

3. The oily sludge reduction treatment device according to claim 2, characterized in that, A separation water tank is provided below the water collection tank. The separation water tank is connected to the water collection tank through a connecting channel. A filter membrane stack is provided in the connecting channel. The filter membrane stack is permeable to water and blocks oil. A third drain port is provided at the bottom of the separation water tank.

4. The oily sludge reduction treatment device according to claim 2, characterized in that, The water collection tank is equipped with a partition, which divides the interior of the water collection tank into a first space and a second space that are connected at the top. The first space is connected to the dehydration capillary channel, and the first drain outlet is located on the side wall of the second space.

5. The oily sludge reduction treatment device according to claim 4, characterized in that, The first drain outlet is connected to the oil collection tank via a connecting pipe.

6. The oily sludge reduction treatment device according to claim 5, characterized in that, A first valve is installed in the first drain port or on the connecting pipeline, and a first level gauge is installed in the second space.

7. The oily sludge reduction treatment device according to claim 1, characterized in that, The pore size of the dehydration capillary channels and the deoiling capillary channels is 0.01-2 micrometers.

8. The oily sludge reduction treatment device according to claim 1, characterized in that, The volume ratio of the dehydration capillary channels to the total volume of the sidewalls of the dehydration chamber is 0.05-4%; the volume ratio of the deoiling capillary channels to the total volume of the sidewalls of the deoiling chamber is 0.05-4%.

9. The oily sludge reduction treatment device according to claim 8, characterized in that, The volume percentage of the dehydration capillary channels is 1-2%; The volume ratio of the degreasing capillary channels is 1-2%.

10. The oily sludge reduction treatment device according to claim 1, characterized in that, The inner wall of the dehydration capillary channel is provided with a first hydrophilic coating, and the inner wall of the oil removal capillary channel is provided with a first hydrophobic coating.

11. The oily sludge reduction treatment device according to claim 1, characterized in that, The bottom of the housing is provided with a support foot, the length of which is adjustable so that the housing can be tilted so that the first end of the housing where the feed inlet is located is lower than the second end of the housing where the discharge outlet is located.

12. The oily sludge reduction treatment device according to claim 1, characterized in that, The inner wall of the dehydration chamber is provided with a second hydrophilic coating, and the end of the dehydration capillary channel near the dehydration chamber is provided with multiple oil droplet separation and blocking structures, the oil droplet separation and blocking structures including: The first barrier plate has its lower end connected to the inner wall of the dehydration chamber via a first bracket. The upper end of the first barrier plate is inclined toward the direction close to the feed inlet. The first barrier plate blocks at least one dehydration capillary channel in the vertical direction. Multiple first liquid outlets are formed in the first bracket. A second hydrophobic coating and a third hydrophilic coating are respectively disposed on the side of the first barrier plate near the discharge port and the side of the first barrier plate near the inlet port.

13. The oily sludge reduction treatment device according to claim 12, characterized in that, The inner wall of the oil removal chamber is provided with a third hydrophobic coating, and the end of the oil removal capillary channel near the oil removal chamber is provided with multiple water droplet separation and blocking structures, the water droplet separation and blocking structures including: The second barrier plate has its upper end connected to the inner wall of the deoiling chamber via a second bracket. The upper end of the second barrier plate is inclined toward the direction close to the feed inlet, and the second barrier plate blocks at least one deoiling capillary channel in the vertical direction. Multiple second liquid outlets are formed inside the second bracket. A fourth hydrophobic coating and a fourth hydrophilic coating are respectively disposed on the side of the second barrier plate near the feed inlet and the side of the second barrier plate near the discharge outlet.

14. The oily sludge reduction treatment device according to claim 13, characterized in that, The height of the first liquid outlet and the second liquid outlet is 0.5-3 micrometers.

15. A method for reducing the volume of oily sludge, utilizing the oily sludge reduction treatment device according to any one of claims 1-14, characterized in that, The method includes: Oily sludge and demulsifier are fed into the dewatering chamber through the feed inlet; The material in the dehydration chamber is heated, stirred and conveyed, and the first liquid generated in the dehydration chamber is discharged through the dehydration capillary channel, and the dehydrated material enters the deoiling chamber. The dehydrated material in the deoiling chamber is heated, stirred and conveyed, and the second liquid in the deoiling chamber is discharged through the deoiling capillary channels; The solid products generated in the degreasing chamber are discharged through the discharge port.

16. The method for reducing the volume of oily sludge according to claim 15, characterized in that, It also includes collecting the first liquid and the second liquid, and performing oil-water separation on the first liquid.

17. The method for reducing the volume of oily sludge according to claim 15, characterized in that, The demulsifier is selected from at least one of sodium lignosulfonate, tetrasodium ethylenediaminetetraacetate, polyethylene terephthalate, polyquaternium salt, polyether polyquaternium salt, terephthalic acid, glycerol, nonylphenol polyoxyethylene ether, tetraphenylborate amine, polyacrylate, dimethyl silicone oil, sodium dodecylbenzenesulfonate, sodium polyacrylate, carbon tetrachloride, butanediol, hexadecyltrimethylammonium bromide, and alkylphenol polyoxyethylene ether.

18. The method for reducing the volume of oily sludge according to claim 15, characterized in that, The amount of demulsifier added relative to the oily sludge is 0.5-10 g / L.

19. The method for reducing the volume of oily sludge according to claim 18, characterized in that, The amount of demulsifier added relative to the oily sludge is 2-5 g / L.

20. The method for reducing the volume of oily sludge according to claim 15, characterized in that, The temperature inside the dehydration chamber is 30-120℃; the temperature inside the oil removal chamber is 30-120℃.

21. The method for reducing the volume of oily sludge according to claim 20, characterized in that, The temperature inside the dehydration chamber is 40-50℃; The temperature inside the oil removal chamber is 70-80℃.

22. The method for reducing the volume of oily sludge according to claim 15, characterized in that, The residence time of the oily sludge in the dewatering chamber is 0.5-6 hours, and the residence time of the oily sludge in the deoiling chamber is 0.5-6 hours.

23. The method for reducing the volume of oily sludge according to claim 22, characterized in that, The oily sludge stays in the dewatering chamber for 1-3 hours; The oily sludge stays in the degreasing chamber for 1-3 hours.

24. The method for reducing the volume of oily sludge according to claim 15, characterized in that, When the inner wall of the dehydration capillary channel is provided with a first hydrophilic coating and the inner wall of the deoiling capillary channel is provided with a first hydrophobic coating, the water droplet contact angle of the first hydrophilic coating is in the range of 2-25° and the water droplet contact angle of the first hydrophobic coating is in the range of 95-130°.

25. The method for reducing the volume of oily sludge according to claim 24, characterized in that, The water droplet contact angle of the first hydrophilic coating ranges from 5 to 10°; The water droplet contact angle of the first hydrophobic coating is in the range of 105-115°.

26. The method for reducing the volume of oily sludge according to claim 15, characterized in that, It also includes tilting the housing so that the first end of the housing where the inlet is located is lower than the second end of the housing where the outlet is located.

27. The method for reducing the volume of oily sludge according to claim 26, characterized in that, The shell is tilted at an angle of 1-30° relative to the horizontal plane.

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