Oily sludge reduction treatment device and method

Abstract

The invention provides an oily sludge reduction treatment device and method, and relates to the technical field of oily sludge treatment.The oily sludge reduction treatment device comprises a shell, a dewatering chamber and a deoiling chamber are sequentially arranged in the shell, the dewatering chamber is communicated with the deoiling chamber, and the dewatering chamber is communicated with the deoiling chamber; a feed port communicated with the dehydration chamber and a discharge port communicated with the deoiling chamber are respectively formed in two ends of the shell, a dehydration capillary channel and a deoiling capillary channel which are communicated with the dehydration chamber are respectively formed in the side wall of the dehydration chamber and the side wall of the deoiling chamber, and heating parts are arranged in the side wall of the dehydration chamber and the side wall of the deoiling chamber; the stirring and conveying mechanism is arranged in the shell and is used for stirring and conveying materials in the dehydration chamber and the deoiling chamber; the problems of high solid-liquid separation difficulty, complicated operation, high cost, large occupied area and limited application range for oily sludge with different component characteristics in the reduction treatment process of the oily sludge in the prior art are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of oily sludge treatment, and more specifically, relates to a device and method for reducing the amount of oily sludge. Background Art

[0002] In the process of oil extraction, transportation, refining, chemical industry and sewage treatment, there is a mixture of mud, sand and water containing oil components, which is collectively referred to as oily sludge. Oily sludge is classified as hazardous solid waste, and direct discharge causes serious pollution to water bodies, atmosphere and soil; oily sludge has complex components and presents an emulsified system of oil and water, which is difficult to treat and has high treatment costs. Therefore, it is necessary to reduce the amount of oily sludge in oil fields and oil refineries.

[0003] At present, oily sludge reduction treatment devices often use centrifugal separation for solid-liquid separation. The device composition is complex, the operation is difficult, and the treatment cost is high. In addition, oily sludge contains valuable oil resources. The current oily sludge reduction treatment device consumes a lot of energy for oil separation and recovery, and requires multi-stage centrifugation, which increases the cost of oily sludge treatment. Optimizing the oily sludge reduction treatment device, reducing the difficulty and cost of oil-water separation, and improving the oil-water separation efficiency are important means to achieve more economical oily sludge reduction treatment.

[0004] Oily sludge has different properties due to its different sources. The sludge at the bottom of oil storage tanks often contains a high oil content, the oily mud and sand in oil fields often contains a high solid content, and the sludge produced in the wastewater treatment process of petroleum refining often contains a high water content. For oily sludges of different properties, if the oil and water are separated at the same time in an integrated manner, it will increase the difficulty of oil-water separation, especially for oily sludge with a high water content. The purity of the recovered oil products will decrease after treatment. Therefore, improving the oily sludge reduction treatment device and method to make the reduction device more widely applicable is an important direction to improve the reduction of oily sludge.

[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 utilization boiler, a primary oil spray cooler, and a secondary oil spray cooler. The oil is recovered by separating high-boiling point substances through high-temperature cracking. The oil recovery cost is high and the economy is poor. The remaining low-boiling point recovered oil and cooling water need to be further separated by an oil-water separator. The oil-water separation operation is complicated and the cost needs to be further reduced.

[0006] CN114031255A discloses a process for recovering and treating oil sludge from oil rolling mills. The device includes a box, a liquid storage tank, a sedimentation tank, a mixing centrifugal box, an oil-water separation box, etc. Although oil-water separation and recovery are achieved, the process of sedimentation and centrifugation is used, and there is oil residue in the centrifugation process, so solid-liquid separation is required. The separation and recovery cost is high, and the operating cost of the device needs to be further reduced. Summary of the invention

[0007] The purpose of the present invention is to provide an oily sludge reduction treatment device and method in view of the shortcomings of the prior art, so as to solve the problems of difficulty in solid-liquid separation, complex operation, high cost, large footprint and limited applicability to oily sludge with different composition characteristics in the prior art oily sludge reduction treatment process.

[0008] In order to achieve the above object, the present invention provides an oily sludge reduction treatment device, which comprises:

[0009] A shell, wherein a dehydration chamber and a deoiling chamber are sequentially arranged inside the shell, the dehydration chamber and the deoiling chamber are connected, a feed port connected to the dehydration chamber and a discharge port connected to the deoiling chamber are respectively arranged at two ends of the shell, a dehydration capillary channel and a deoiling capillary channel connected to the dehydration chamber are respectively opened on the side wall of the dehydration chamber and the side wall of the deoiling chamber, and a heating component is arranged inside the side wall of the dehydration chamber and the side wall of the deoiling chamber;

[0010] A stirring and conveying mechanism is arranged inside the shell and is used for stirring and conveying materials in the dehydration chamber and the deoiling chamber.

[0011] The oily sludge and demulsifier can enter the dehydration chamber through the feed port. Under the action of the heating component, the temperature in the dehydration chamber is increased to a temperature suitable for dehydration. The oily sludge is dehydrated in the dehydration chamber to produce water and dehydrated materials. Under the action of the stirring and conveying mechanism, the materials are turned over and transmitted in the direction of the discharge port. The separated water can be absorbed and discharged through the dehydration capillary channels. The dehydrated materials enter the deoiling chamber. Under the action of the heating component, the temperature in the deoiling chamber is increased to a temperature suitable for deoiling. The dehydrated materials are deoiled in the deoiling chamber to produce oil and solid products. Under the action of the stirring and conveying mechanism, the dehydrated materials are continuously turned over and can be discharged through the discharge port. The separated oil can be absorbed and discharged through the deoiling capillary channels, thereby realizing the segmented dehydration and deoiling of oily sludge reduction treatment, which can effectively reduce the oily sludge of various properties, thereby improving the applicability of the oily sludge reduction treatment device. The device adopts an integrated setting, has a compact structure, a small footprint, and is simple to operate, easy to recover oil and water, and has a low operating cost.

[0012] The heating component can be an integrated structure or a split structure. The dehydration chamber and the deoiling chamber can be respectively equipped with heating components to obtain different heating temperatures. A segmented variable frequency heating component can also be used to heat the dehydration chamber and the deoiling chamber with different powers respectively. Similarly, the stirring and conveying mechanism can also adopt an integrated stirring and conveying mechanism or two stirring and conveying mechanisms.

[0013] Optionally, a water collecting trough connected to the dehydration capillary channels and an oil collecting trough connected to the deoiling capillary channels are provided on the outer side of the outer wall of the shell, and a first liquid drain port and a second liquid drain port are provided at the bottom of the water collecting trough and the oil collecting trough, respectively.

[0014] The water collecting trough and the oil collecting trough are used to collect the water and oil respectively guided out through the dewatering capillary channels and the deoiling capillary channels.

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

[0016] The water in the sump still contains a small amount of oil. The separation water tank is connected to the bottom of the sump through a filter membrane stack. The water in the sump passes through the filter membrane stack and enters the separation water tank, while the small amount of oil in the sump cannot pass through the filter membrane stack and remains in the sump. The separation water tank and the filter membrane stack are set 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 water tank.

[0017] Optionally, a partition is provided in the water collecting tank, and the partition divides the interior of the water collecting tank into a first space and a second space connected at the top, the first space is connected to the dehydration capillary channel, and the first drain port is arranged on the side wall of the second space.

[0018] A small amount of oil in the water collection tank floats on the upper side of the water, and the water containing a small amount of oil is led out by the dehydration capillary channel into the first space. The setting of the partition allows the oil to flow through the top of the partition to the second space, thereby realizing the separation and storage of the oil.

[0019] Optionally, the first liquid discharge port is connected to the oil collecting tank through a connecting pipeline.

[0020] The oil in the second space can be discharged into the oil collecting tank through the connecting pipeline, and the oil can be collected uniformly.

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

[0022] The first liquid level gauge can be linked with the first valve for control. According to the detection result of the first liquid level gauge, the opening of the first valve can be automatically controlled to discharge the oil in the second space in time.

[0023] Optionally, the pore diameters of the dehydration capillary channels and the deoiling capillary channels are 0.01-2 μm.

[0024] In the present 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 the equipment processing and forming, which can connect the oily sludge end and the liquid collecting tank end; according to another embodiment, the side wall of the first chamber with the capillary channels is integrally formed using a channel model, for example, it is integrally formed using a channel model during steel rolling; according to another embodiment, the side wall of the first chamber with the capillary channels is made by jet etching, and the device is easy to produce.

[0025] Optionally, relative to the total volume of the side wall of the dehydration chamber, the volume of the dehydration capillary channels accounts for 0.05-4%, preferably 1-2%; relative to the total volume of the side wall of the deoiling chamber, the volume of the deoiling capillary channels accounts for 0.05-4%, preferably 1-2%.

[0026] When the device of the present invention is manufactured, the parameters of the dehydration capillary channels and the deoiling capillary channels can be adjusted, including but not limited to the pore size and volume ratio (ie, the opening ratio).

[0027] The preferred pore size combined with the preferred 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 deoiling 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 ranges from 2-25°, preferably 5-10°, which enhances the separation and recovery of water by the dehydration capillary channels, and the water droplet contact angle of the first hydrophobic coating ranges from 95-130°, preferably 105-115°, which enhances the separation and recovery of oil by the deoiling capillary channels.

[0030] Optionally, a supporting foot is provided at the bottom of the shell, and the length of the supporting foot is adjustable so that the shell can be tilted so that the first end of the shell where the feed port is located is lower than the second end of the shell where the discharge port is located.

[0031] A plurality of support frames form a device bracket, and 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 conveying direction of the material, the transmission of the material presents a certain uphill inclination angle, which promotes the recovery of water and oil under the action of the dehydration capillary channels and the deoiling capillary channels respectively.

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

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

[0034] A first baffle plate, wherein the lower end of the first baffle plate is connected to the inner wall of the dehydration chamber through a first bracket, the upper end of the first baffle plate is inclined toward the direction close to the feed port, and the first baffle plate vertically blocks at least one dehydration capillary channel, and a plurality of first liquid ports are formed in the first bracket;

[0035] A second hydrophobic coating and a third hydrophilic coating, wherein the second hydrophobic coating and the third hydrophilic coating are respectively arranged on a side of the first baffle plate close to the discharge port and a side of the first baffle plate close to the feed port.

[0036] Due to the existence of the inclination angle of the device, the water in the dehydration chamber flows along the bottom of the dehydration chamber from the discharge port to the feed port. In this process, due to the existence of the second hydrophilic coating, a small amount of oil floats on the upper side of the water. The water passes through the first liquid port during the flow, and the oil contacts the second hydrophobic coating. The water passing through the first liquid port enters the dehydration capillary pores and is collected. The oil flows upward along the second hydrophobic coating to form an oil film and quickly leaves, and it is difficult to enter the dehydration capillary pores. The third hydrophilic coating absorbs moisture to form a water film when it contacts water and materials. The water film flows downward into the dehydration capillary pores blocked by the first baffle plate and is collected. The setting of the oil droplet separation barrier structure can reduce the oil entering the dehydration capillary pores and improve the purity of the recovered water.

[0037] Optionally, a third hydrophobic coating is provided on the inner wall of the deoiling chamber, and a plurality of water droplet separation barrier structures are provided at one end of the deoiling capillary channel close to the deoiling chamber, and the oil droplet separation barrier structure includes:

[0038] A second baffle plate, wherein the upper end of the second baffle plate is connected to the inner wall of the deoiling chamber through a second bracket, the upper end of the second baffle plate is inclined toward the direction close to the feed port, and the second baffle plate vertically blocks at least one deoiling capillary channel, and a plurality of second liquid ports are formed in the second bracket;

[0039] A fourth hydrophobic coating and a fourth hydrophilic coating, wherein the fourth hydrophobic coating and the fourth hydrophilic coating are respectively arranged on a side of the second baffle plate close to the feed port and a side of the second baffle plate close to the discharge port.

[0040] The water droplet separation barrier structure is arranged in the deoiling chamber, and the oil in the deoiling chamber flows along the bottom of the deoiling chamber from the discharge port to the feed port. In this process, due to the presence of the third hydrophobic coating, water droplets are repelled, and the oil droplets are close to the bottom of the deoiling chamber to form an oil film, and a small amount of water is on the upper side of the oil. During the flow of the oil, the water passes through the second liquid port, and the water contacts the fourth hydrophilic coating. The oil passing through the second liquid port enters the deoiling capillary pores and is collected. The water flows upward along the fourth hydrophilic coating to form a water film and quickly leaves, and it is difficult to enter the deoiling capillary pores. The fourth hydrophobic coating absorbs oil to form an oil film when contacting the oil and the material. The oil film flows downward into the deoiling capillary pores blocked by the second barrier plate and is collected. The setting of the water droplet separation barrier structure can reduce the entry of water into the deoiling capillary pores, thereby realizing the recovery of high-purity oil products.

[0041] Optionally, the water drop contact angle of the second hydrophilic coating ranges from 2 to 25°, and the water drop 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 microns.

[0043] The present invention also provides a method for reducing the amount of oily sludge, using the above-mentioned device for reducing the amount of oily sludge, the method comprises:

[0044] The oily sludge and demulsifier are fed into the dehydration chamber from the feed inlet;

[0045] Heating, stirring and conveying the material in the dehydration chamber, leading out the first liquid generated in the dehydration chamber through the dehydration capillary channel, and allowing the dehydrated material to enter the deoiling chamber;

[0046] Heating, stirring and conveying the dehydrated material in the deoiling chamber, and conducting the second liquid in the deoiling chamber through the deoiling capillary channel;

[0047] The solid product produced in the deoiling chamber is discharged through the discharge port.

[0048] The method separates and recovers oil and water resources in sections. The oily sludge to be treated can be high-water-content oily sludge, high-oil-content oily sludge, and high-solid-content oily sludge. It has a wide treatment range 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 from the dehydration chamber contains a small amount of oil. By separating the oil from the water, the purity of the collected water can be improved. The separated oil can be input into the second liquid for the reuse of the oil product.

[0051] Optionally, the demulsifier is selected from at least one of sodium lignin sulfonate, tetrasodium ethylenediaminetetraacetic acid, polyethylene terephthalate, polyquaternary ammonium salt, polyether polyquaternary ammonium salt, terephthalic acid, glycerol, nonylphenol polyoxyethylene ether, tetraphenylborate, polyacrylate, dimethyl silicone oil, sodium dodecylbenzene sulfonate, sodium polyacrylate, carbon tetrachloride, butanediol, hexadecyltrimethylammonium bromide, and alkylphenol polyoxyethylene ether.

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

[0053] Optionally, the temperature in the dehydration chamber is 30-120°C, preferably 40-50°C; the temperature in the deoiling chamber is 30-120°C, preferably 70-80°C.

[0054] The temperatures in the dehydration chamber and the deoiling chamber may affect the dehydration effect in the dehydration chamber and the deoiling effect in the deoiling chamber.

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

[0056] Reasonable selection of the dehydration time in the dehydration chamber and the deoiling time in the deoiling chamber can improve the reduction treatment effect of oily sludge.

[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 ranges from 2-25°, preferably 5-10°, and the water droplet contact angle of the first hydrophobic coating ranges from 95-130°, preferably 105-115°.

[0058] Optionally, the shell is tilted so that the first end of the shell where the feed port is located is lower than the second end of the shell where the discharge port is located.

[0059] Optionally, the inclination angle of the shell 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 amount of oily sludge comprises the following steps:

[0061] S1: Feed

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

[0063] S2: Dehydration

[0064] In the dehydration chamber, the stirring and conveying mechanism causes the material to be continuously and efficiently stirred and pushes the material to continuously move toward the deoiling chamber. Under the action of the heating component, the material in the dehydration chamber is heated and kept warm;

[0065] S3: Water recovery

[0066] In the dehydration chamber, the demulsified material is separated into solid and liquid, and the water is separated from the oily sludge by controlling the temperature. The bottom of the dehydration chamber is provided with a dehydration capillary channel, which collects the water in the dehydration chamber by self-absorption and enters the water collection tank. The oil in the water is further filtered through the filter membrane stack at the bottom of the water collection tank, and the water is further purified and collected in the separation water tank, and discharged through the third drain port for reuse;

[0067] S4: Deoiling

[0068] The dehydrated material that has stayed in the dehydration chamber for a certain period of time is pushed into the deoiling chamber by the stirring and conveying mechanism. The stirring and conveying mechanism in the deoiling chamber continues to slowly stir the dehydrated material and continuously pushes it toward the discharge port. The heating component in the deoiling chamber keeps the dehydrated material warm at different temperatures to separate the oil from the dehydrated material.

[0069] S5: Oil recovery

[0070] After the dehydrated materials in the deoiling chamber are further separated from the oil by high-temperature demulsification, the oil in the deoiling chamber is collected by self-priming through the deoiling capillary channels at the bottom and enters the oil collecting tank. The oil filtered and separated in the water collecting tank is regularly introduced into the oil collecting tank through the connecting pipeline and regularly discharged through the second drain port at the bottom of the oil collecting tank for reuse;

[0071] S6: Discharging

[0072] The solid product kept in the deoiling chamber for a certain period of time is pushed by the stirring and conveying mechanism and discharged through the discharge port, and the generated waste gas is discharged through the outlet arranged on the shell and 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 a deoiling chamber, and separates and recovers oil and water resources in a segmented manner, thereby improving the applicability of the oily sludge reduction treatment device. The oily sludge to be treated can be high-water-content oily sludge or high-oil-content oily sludge, with a wide treatment range and strong adaptability;

[0074] (2) Recovering oil and water resources by self-priming through dewatering 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 the water droplet separation barrier structure and the oil droplet separation barrier structure improves the separation and recovery effect of the device on water resources and oil resources. The purity of the recovered water resources and oil resources is significantly improved, which is higher than 98.5% and 99.5% respectively.

[0076] The present invention provides an oil-containing sludge reduction treatment device and method, and its beneficial effects are: the oil-containing sludge reduction treatment device is provided with a dehydration chamber and a deoiling chamber in sequence along the conveying direction of the material in a shell, and a stirring and conveying mechanism is provided in the dehydration chamber and the deoiling chamber to realize the conveying of the material from the feed port to the discharge port, the oil-containing sludge and the demulsifier can be input into the dehydration chamber through the feed port, and the heating component heats them to provide a temperature suitable for dehydration, and the oil-containing sludge is turned and moved under the stirring and conveying action of the stirring and conveying mechanism, so that the oil-containing sludge is dehydrated in the dehydration chamber, and the separated water The dewatered material is absorbed and guided out through the dehydration capillary channels to collect water, and the dehydrated material enters the deoiling chamber. In the deoiling chamber, the material is still turned and moved under the action of the stirring and conveying mechanism, and the heating component heats it to provide a temperature suitable for deoiling, so that the oily sludge is deoiled in the deoiling chamber, and the separated oil is absorbed and guided out through the deoiling capillary channels to collect the oil products. The solid product can be discharged through the discharge port for further deep treatment, and the generated gas can also be discharged through the gas outlet for purification; in a preferred embodiment, the oily sludge reduction treatment device The shell body is tilted so that the first end of the shell body where the feed port is located is lower than the second end of the shell body where the discharge port is located, an oil drop separation barrier structure is arranged at one end of the dehydration capillary channel close to the dehydration chamber, a water drop separation barrier structure is arranged at one end of the deoiling capillary channel close to the deoiling chamber, the oil drop separation barrier structure is provided with a second hydrophilic coating on the inner wall of the dehydration chamber, the upper end of the first barrier plate is tilted toward the direction close to the feed port, and at least one dehydration capillary channel is vertically blocked, a second hydrophobic coating and a second hydrophilic coating are arranged on both sides of the first barrier plate close to the discharge port and close to the feed port, respectively, and the bottom of the dehydration chamber is provided with a second hydrophobic coating and a second hydrophilic coating. Part of the water flows from the second end to the first end, the water can flow through the first liquid port in the first bracket and enter the dehydration capillary channel on the side of the first liquid port close to the feed port. Due to the arrangement 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 and forms an oil film on the second hydrophobic coating and quickly leaves. When the second hydrophilic coating contacts water, it absorbs water and forms a water film that flows into the dehydration capillary channel blocked by the first barrier plate. The arrangement of the oil droplet separation barrier structure can improve the purity of the collected water, and similarly, the arrangement 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. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0079] Figure 1 A schematic structural 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 the cross-sectional structure in two positions.

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

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

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

[0084] Description of reference numerals:

[0085] 1. Shell; 2. Dehydration chamber; 3. Deoiling chamber; 4. Feed inlet; 5. Discharge 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 collecting trough; 19. Oil collecting trough; 20. First liquid discharge port; 21. Second liquid discharge port; 22. Third liquid discharge port; 23. First valve; 24. Second valve; 25. Third valve; 26. Connecting pipeline; 27. Separation water tank; 28. Filter membrane stack; 29. ​​Partition; 30. Support foot; 31. First baffle plate; 32. First bracket; 33. First liquid outlet; 34. Second hydrophobic coating; 35. Third hydrophilic coating. DETAILED DESCRIPTION

[0086] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present 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, the device comprising:

[0089] A shell 1, wherein a dehydration chamber 2 and a deoiling chamber 3 are sequentially arranged inside the shell 1, the dehydration chamber 2 and the deoiling chamber 3 are connected, and a feed port 4 connected to the dehydration chamber 2 and a discharge port 5 connected to the deoiling chamber 3 are respectively arranged at two ends of the shell 1, a dehydration capillary channel 6 and a deoiling capillary channel 7 connected to the dehydration chamber 2 are respectively opened on the side wall of the dehydration chamber 2 and the side wall of the deoiling chamber 3, and a heating component is arranged inside the side wall of the dehydration chamber 2 and the side wall of the deoiling chamber 3;

[0090] The stirring and conveying mechanism is arranged inside the shell 1 and is used to stir and convey the materials in the dehydration chamber 2 and the deoiling chamber 3 .

[0091] In this embodiment, if Figure 1 As shown, a tapered structure is provided in the middle of the shell 1, and a communication port is formed in the middle of the tapered structure, and the dehydration chamber 2 and the deoiling chamber 3 are connected through the communication port; Figure 2 As shown, the dehydration chamber 2 is provided with three first stirring and conveying mechanisms 8 arranged in a herringbone shape to enhance the stirring ability of the material in the dehydration chamber 2 and enhance the dehydration performance, and the side wall of the dehydration chamber 2 is provided with a first heating component 10 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 opened at the top of the deoiling chamber 3, and an exhaust valve is provided on the air outlet 12.

[0092] Further, 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 is inserted into the heat-conducting layer 13. The heat-conducting layer 13 can improve the thermal conductivity and the heating efficiency. In the present embodiment, the heat-conducting layer 13 is heat-conducting oil, so the shell 1 includes an inner shell and an outer shell, and a sandwich is formed between the inner shell and the outer shell, and the heat-conducting oil is filled in the sandwich. At this time, the dehydration capillary pores 6 and the deoiling capillary pores 7 are both provided on the inner shell, and the outer shell is provided with through holes at corresponding positions and the periphery of the through holes is connected to the inner shell through the cylinder, so that the liquid guided out through the dehydration capillary pores 6 and the deoiling capillary pores 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, and one end of the first rotating shaft is connected to a first driving motor 14, and a first stirring and conveying blade is provided on the outer periphery of the first rotating shaft. The first stirring and conveying mechanism 8 drives the first rotating shaft to drive the first stirring and conveying blade to rotate through the first driving motor 14, and the first stirring and conveying blade can stir the material while On the one hand, the material is transported from a position near the feed port 4 to a direction near the discharge port 5; the first stirring and conveying blade adopts an auger blade, and the residence time of the material in the dehydration 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 shell 1 and is connected to the first drive motor 14 outside the shell 1, and the outer periphery of the first rotating shaft is provided with a first sealing component 16 connected to the shell 1; the second stirring and conveying mechanism 9 includes a second rotating shaft, the second rotating shaft is rotatably arranged in 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 a second stirring and conveying blade, one end of the second rotating shaft passes through the side wall of the shell 1, and is connected to the second drive motor 15 outside the shell 1, and the outer periphery of the second rotating shaft is provided with a second sealing component 17 connected to the shell 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, which will not be repeated here.

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

[0094] In this embodiment, the power of the first heating component 10 and the second heating component 11 is adjustable, thereby facilitating the adjustment of the temperature in the dehydration chamber 2 and the deoiling chamber 3 .

[0095] A water collecting groove 18 communicating with the dehydration capillary channel 6 and an oil collecting groove 19 communicating with the deoiling capillary channel 7 are arranged on the outer side of the outer wall of the shell 1. A first liquid drain port 20 and a second liquid drain port 21 are arranged at the bottom of the water collecting groove 18 and the oil collecting groove 19, respectively.

[0096] A separation water tank 27 is provided below the water collecting tank 18 . The separation water tank 27 is connected to the water collecting tank 18 through a connecting channel. A filter membrane stack 28 is provided in the connecting channel. The filter membrane stack 28 is water-permeable and oil-blocking. A third liquid discharge port 22 is provided at the bottom of the separation water tank 27 .

[0097] In this embodiment, the filter membrane stack 28 is super hydrophilic, with a water droplet contact angle ranging from 0.5° to 10°, and can selectively pass water and isolate oil, thereby improving the purity of water resources recovered in the separation water tank 27 .

[0098] A partition 29 is provided in the water collecting tank 18, and the partition 29 divides the inside of the water collecting tank 18 into a first space and a second space connected at the top. The first space is connected to the dehydration capillary channel 6, and the first drain port 20 is provided on the side wall of the second space.

[0099] The first liquid discharge port 20 is connected to the oil collecting tank 19 through a connecting pipe 26 .

[0100] A first valve 23 is disposed in the first liquid discharge port 20 or on the connecting pipeline 26 , and a first liquid level meter is disposed 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 meter. When the liquid level detected by the first liquid level meter is higher than the first set liquid level, the PLC control system automatically controls the first valve 23 to open and discharge the oil into the oil collecting tank 19.

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

[0103] The pore diameters of the dehydration capillary channels 6 and the deoiling capillary channels 7 are 0.01-2 microns.

[0104] Relative to the total volume of the side wall of the dehydration chamber 2, the volume of the dehydration capillary channel 6 accounts for 0.05-4%, preferably 1-2%; relative to the total volume of the side wall of the deoiling chamber 3, the volume of the deoiling capillary channel 7 accounts for 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] A support foot 30 is provided at the bottom of the shell 1, and the length of the support foot 30 is adjustable so that the shell 1 can be tilted so that the first end of the shell 1 where the feed port 4 is located is lower than the second end of the shell 1 where the discharge port 5 is located.

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

[0108] a second hydrophilic coating, the second hydrophilic coating being disposed on the inner wall of the dehydration chamber;

[0109] A first baffle plate 31, the lower end of which is connected to the inner wall of the dehydration chamber 2 through a first bracket 32, the upper end of which is inclined toward the direction close to the feed port 4, and the first baffle plate 31 vertically blocks at least one dehydration capillary channel 6, and a plurality of first liquid ports 33 are formed in the first bracket 32;

[0110] The second hydrophobic coating 34 and the third hydrophilic coating 35 are respectively arranged on a side of the first baffle plate 31 close to the discharge port 5 and a side of the first baffle plate 31 close to the feed port 4 .

[0111] The end of the deoiling capillary channel 7 close to the deoiling chamber 3 is provided with a water droplet separation barrier structure, and the oil droplet separation barrier structure includes:

[0112] a third hydrophobic coating, the third hydrophobic coating being disposed on an inner wall of the deoiling chamber;

[0113] A second baffle plate 29, the upper end of which is connected to the inner wall of the de-oiling chamber 3 through a second bracket, the upper end of which is inclined toward the direction close to the feed port 4, and the second baffle plate 29 vertically blocks at least one de-oiling capillary channel 7, and a plurality of second liquid ports are formed in the second bracket;

[0114] The fourth hydrophobic coating and the fourth hydrophilic coating are respectively arranged on a side of the second baffle plate 29 close to the feed port 4 and a side of the second baffle plate 29 close to the discharge port 5 .

[0115] The height of the first liquid passage opening 33 and the second liquid passage opening is 0.5-3 microns.

[0116] Examples 2A-2J

[0117] The oily sludge reduction treatment device of Example 1 is used to reduce the oily sludge, and the steps are as follows: Figure 6 shown.

[0118] Example 2A

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

[0120] S1: Feed

[0121] The oily sludge to be treated is added into the dehydration chamber 2 through the feed port 4 at a flow rate of 15 kg / h. The demulsifier is selected from tetraphenyl boric acid amine, hexadecyl trimethyl ammonium 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 component 10 in the dehydration chamber 2, the material temperature is 45°C, and the first stirring and conveying mechanism 8 is used to stir and convey the material, so that the residence time of the material in the dehydration chamber 2 is maintained at 90 minutes;

[0124] S3: Water recovery

[0125] The water separated from the solid and liquid after demulsification in the dehydration chamber 2 is recovered by self-absorption through the dehydration capillary channel 6. The average pore size of the dehydration capillary channel 6 is 0.86 microns. The dehydration capillary channel 6 occupies 1.2% of the volume of the bottom of the dehydration chamber 2. The contact angle of the water droplet of the first hydrophilic coating on the inner wall of the dehydration capillary channel 6 is 8°. The dehydration capillary channel 6 is provided with an oil drop separation barrier structure, the structure of which is as follows: Figure 4 and Figure 5 As shown, in Figure 4The material moves from left to right. Since the device has an inclination 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, and its water drop contact angle is 8°. Different coatings exist on both sides of the first barrier plate 31 of the oil droplet separation barrier structure. The second hydrophobic coating 34 is on the right side of the first barrier plate 31, and the third hydrophilic coating 35 is on the left side of the first barrier plate 31. The first barrier plate 31 and the bottom wall of the dehydration chamber 2 are connected and supported by a first bracket 32. There is a first liquid port 33 between the first brackets 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 makes it horizontally spread on the bottom wall surface of the dehydration chamber 2, and the oil product appears as oil droplets moving above the water. When it reaches the first liquid port 33, since the height of the first liquid port 33 is small, the height is 0.7 microns, the water layer will quickly pass through the first liquid port 33, and the oil droplets The oil is blocked by the first baffle plate 31 and then forms an oil film on the second hydrophobic coating 34 and quickly leaves the bottom wall surface of the dehydration chamber 2. The third hydrophilic coating 35 on the left side of the first baffle plate 31 absorbs water when contacting the material to form a water film and flows into the dehydration capillary channel 6 for recovery. The purity of the water recovered in the dehydration chamber 2 is improved by setting the oil droplet separation barrier structure, and the water is introduced into the water collection tank 18. The water in the water collection tank 18 is further filtered by 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 drop 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 microns. The separation water tank 27 is equipped with a second liquid level gauge. The third valve 25 is regularly opened and closed according to the second set liquid level through the PLC control system, and the water resources are discharged through the third drain port 22 for reuse. The purity of the recovered water resources is higher than 98.7%;

[0126] S4: Deoiling

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

[0128] S5: Oil recovery

[0129] The oil separated from the solid and liquid after high-temperature demulsification in the deoiling chamber 3 is recovered by self-absorption through the deoiling capillary pores 7. The average pore size of the deoiling capillary pores 7 is 1.06 microns, and the deoiling capillary pores 7 account for 2.36% of the volume of the bottom of the deoiling chamber 3. The water drop contact angle of the third hydrophobic coating on the bottom wall of the deoiling chamber 3 is 108°. A water drop separation barrier structure is provided on the bottom wall of the deoiling chamber 3, which is similar to the working principle of the oil drop separation barrier structure, and promotes the high-purity recovered oil to enter the oil collecting tank 19. The water collecting tank 18 is separated by a partition 29 so that the top of the partition 29 of the oil in the water collecting tank 18 flows into the second space on the right side of the water collecting tank 18, and the first valve 23 is opened and closed regularly, and the oil is introduced into the oil collecting tank 19 through the connecting pipeline 26. The oil collecting tank 19 is equipped with a third liquid level gauge, and the second valve 24 is opened and closed regularly through the PLC control system. High-quality oil resources are recovered through the second drain port 21, and the purity of the recovered oil resources is higher than 99.7%;

[0130] S6: Discharging

[0131] The solid product treated 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 continuously feeds and discharges. The water content of the treated solid product is 6%, the oil content is 8%, the solid content is 86%, and the reduction rate is 86%. The waste gas generated during the high-temperature demulsification process is discharged to the purification unit through the outlet 12.

[0132] Example 2B

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

[0134] S1: Feed

[0135] The oily sludge to be treated is added into the dehydration chamber 2 through the feed port 4 at a flow rate of 25 kg / h. The demulsifiers are 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 component 10 in the dehydration chamber 2, the material temperature is 50°C, and the first stirring and conveying mechanism 8 is used to stir and convey the material, so that the residence time of the material in the dehydration chamber 2 is maintained at 180 minutes;

[0138] S3: Water recovery

[0139] The water separated from the solid and liquid after demulsification in the dehydration chamber 2 is recovered by self-absorption through the dehydration capillary channel 6. The average pore size of the dehydration capillary channel 6 is 1.35 microns. The dehydration capillary channel 6 accounts for 3.2% of the volume of the bottom of the dehydration chamber 2. The contact angle of the water droplet of the second hydrophilic coating on the bottom wall of the dehydration chamber 2 is 8°. The bottom wall of the dehydration chamber 2 is provided with an oil droplet separation barrier structure to improve the purity of the water recovered in the dehydration chamber 2. The water is introduced into the water collection tank 18. The water in the water collection tank 18 is further passed through the water collection tank 18. Oil-water separation is achieved by separation through the filter membrane stack 28. High-purity water enters the separation water tank 27 through the filter membrane stack 28 coated with a hydrophilic coating. The water drop contact angle of the hydrophilic coating on the filter membrane stack 28 is 5°. The pore size of the filter membrane stack 28 is 0.7 microns. The separation water tank 27 is equipped with a second liquid level gauge. The third valve 25 is regularly opened and closed according to the second set liquid level through the PLC control system to discharge water resources through the third drain port 22 for reuse. The purity of the recovered water resources is higher than 99.3%;

[0140] S4: Deoiling

[0141] After dehydration in the dehydration chamber 2, the dehydrated material enters the deoiling chamber 3, is heated by the second heating component 11, and the material temperature is 70°C. The second stirring and conveying component stirs and conveys the dehydrated material, so that the residence time of the dehydrated material in the deoiling chamber 3 is maintained at 80 minutes.

[0142] S5: Oil recovery

[0143] The oil separated from the solid and liquid after high-temperature demulsification in the deoiling chamber 3 is recovered by self-absorption through the deoiling capillary pores 7. The average pore size of the deoiling capillary pores 7 is 0.62 microns, and the deoiling capillary pores 7 account for 1.1% of the volume of the bottom of the deoiling chamber 3. The water drop contact angle of the third hydrophobic coating on the bottom wall of the deoiling chamber 3 is 108°. A water drop separation barrier structure is provided on the bottom wall of the deoiling chamber 3. The recovered oil enters the oil collecting tank 19. The water collecting tank 18 is separated by a partition 29 so that the oil in the box flows from the upper part to the right side of the water collecting tank 18. The first valve 23 is opened and closed regularly to introduce the oil into the oil collecting tank 19 through the connecting pipeline 26. The oil collecting tank 19 is equipped with a third liquid level gauge. The second valve 24 is opened and closed regularly through the PLC control system. 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: Discharging

[0145] The solid product treated 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 continuously feeds and discharges. The water content of the treated solid product is 7%, the oil content is 1%, the solid content is 92%, and the reduction rate is 93%. The waste gas generated during the high-temperature demulsification process is discharged to the purification unit through the outlet 12.

[0146] Example 2C

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

[0148] S1: Feed

[0149] The oily sludge to be treated is added into the dehydration chamber 2 through the feed port 4 at a flow rate of 10 kg / h, and polyethylene terephthalate is selected as the demulsifier, 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 component 10 in the dehydration chamber 2, the material temperature is 55°C, and the first stirring and conveying mechanism 8 is used to stir and convey the solid material, so that the residence time of the solid material in the dehydration chamber 2 is maintained at 70 minutes;

[0152] S3: Water recovery

[0153] The water separated from the solid and liquid after demulsification in the dehydration chamber 2 is recovered by self-absorption through the dehydration capillary channel 6. The average pore size of the dehydration capillary channel 6 is 1.12 microns. The dehydration capillary channel 6 accounts for 1.8% of the volume of the bottom of the dehydration chamber 2. The contact angle of the water droplet of the second hydrophilic coating on the bottom wall of the dehydration chamber 2 is 8°. An oil droplet separation barrier structure is provided on the bottom wall of the dehydration chamber 2 to improve the purity of the water recovered in the dehydration chamber 2. The water is introduced into the water collection tank 18. The water in the water collection tank 18 is further The filter membrane stack 28 separates oil and water, and high-purity water enters the separation water tank 27 through the filter membrane stack 28 coated with a hydrophilic coating. The water drop 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 microns. The separation water tank 27 is equipped with a second liquid level gauge. The third valve 25 is regularly opened and closed according to the second set liquid level through the PLC control system, and the water resources are discharged through the third drain port 22 for reuse. The purity of the recovered water resources is higher than 98.7%;

[0154] S4: Deoiling

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

[0156] S5: Oil recovery

[0157] The oil separated from the solid and liquid after high-temperature demulsification in the deoiling chamber 3 is recovered by self-absorption through the deoiling capillary pores 7. The average pore size of the deoiling capillary pores 7 is 0.32 microns, and the deoiling capillary pores 7 account for 1.65% of the volume of the bottom of the deoiling chamber 3. The water drop contact angle of the third hydrophobic coating on the bottom wall of the deoiling chamber 3 is 108°. A water drop separation barrier structure is provided on the bottom wall of the deoiling chamber 3 to improve the purity of the recovered oil. The recovered oil enters the oil collecting tank 19. The water collecting tank 18 is separated by a partition 29 so that the oil in the box flows from the upper part to the right side of the water collecting tank 18, and the first valve 23 is opened and closed regularly to introduce the oil into the oil collecting tank 19 through the connecting pipeline 26. The oil collecting tank 19 is equipped with a third liquid level gauge, and the second valve 24 is opened and closed regularly through the PLC control system. High-quality oil resources are recovered through the second liquid discharge port 21, and the purity of the recovered oil resources is higher than 99.6%;

[0158] S6: Discharging

[0159] The solid product treated 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 continuously feeds and discharges. The treated solid product has a moisture content of 6%, an oil content of 6%, a solid content of 88%, and a reduction rate of 45%. The waste gas generated during the high-temperature demulsification process is discharged to the purification unit through the outlet 12.

[0160] Examples 2D1-2D9

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

[0162] Table 1

[0163]

[0164] By comparison, it is found that the residence time of the oily sludge in the dewatering chamber 2 and the deoiling chamber 3 will affect the oily sludge reduction effect. Maintaining a suitable residence time can achieve low-cost and high-efficiency oily sludge reduction, and improve the treatment efficiency and treatment effect of the oily sludge reduction treatment device. When the residence time of the oily sludge in the dewatering chamber 2 and the deoiling chamber 3 is higher than 30 minutes, the oily sludge reduction rate can be maintained at more than 75%. When the residence time of the oily sludge in the dewatering chamber 2 and the deoiling chamber 3 is higher than 60 minutes, the oily sludge reduction rate can be maintained at more than 80%.

[0165] Examples 2E1-2E17

[0166] The same device and method as in Example 2A are used, but the heating temperature and the amount of demulsifier added to the oily sludge in the dewatering chamber 2 and the deoiling chamber 3 are regulated 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] By comparison, it is found that regulating the demulsifier content can improve the oily sludge reduction effect, controlling the demulsifier content can achieve low-cost and high-efficiency oily sludge reduction, and reasonable control of the temperature in the dehydration chamber 2 and the deoiling chamber 3 can improve the purity of oil and water resource recovery and improve the recovery capacity of the device. When the material temperature in the dehydration chamber 2 is 40-50°C, the material temperature in the deoiling chamber 3 is 70-80°C, and the demulsifier addition amount is 2-5g / L oily sludge, the oily sludge reduction rate can reach more than 85%, and 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 device and method with the same structure as Example 2A are used, but whether the oil droplet separation barrier structure and the water droplet separation barrier structure are used during the adjustment operation, and the corresponding water and oil resource recovery purity results of different oil droplet separation barrier structures and water droplet separation barrier structures are shown in Table 3 below:

[0172]

[0173] A comparison shows that the design and use of the oil droplet separation barrier structure and the water droplet separation barrier structure significantly improved the oil-water separation effect, maintaining the purity of the recovered water and oil products at higher than 98.5% and 99.5% respectively, thereby increasing the purity of recovered oil and water resources and improving the economic efficiency of the oily sludge reduction treatment device.

[0174] Examples 2G1-2G13

[0175] The same device and method as in Example 2A are used, but the coating materials of the inner coating of the dehydration capillary channel 6 of the dehydration chamber 2 and the inner coating of the deoiling capillary channel 7 in the deoiling chamber 3 of the device are different, so that the water drop contact angle is different. The water and oil resource recovery purity results corresponding to different water drop contact angles are shown in Table 4 below:

[0176]

[0177]

[0178] By comparison, it is found that controlling the hydrophilicity of the first hydrophilic coating in the dehydration capillary channel 6 and controlling the hydrophobicity of the first hydrophobic coating in the deoiling capillary channel 7 can significantly improve the purity of the device for separating oil and water resources, and improve the separation performance and separation effect of the device. When the water droplet contact angle of the dehydration capillary channel coating is 5-10°, the purity of the recovered water is relatively high, maintaining above 98.5%; when the water droplet contact angle of the deoiling capillary channel coating is 105-115°, the purity of the recovered oil is relatively high, maintaining above 99.5%.

[0179] Examples 2H1-2H9

[0180] The device and method with the same structure as in Example 2A are used, but the pore sizes and proportions of the dewatering capillary channels 6 of the dewatering chamber 2 and the deoiling capillary channels 7 of the deoiling chamber 3 of the device are different. The oily sludge reduction rate results corresponding to different capillary channel parameters are shown in Table 5 below:

[0181]

[0182]

[0183] By comparison, it was found that maintaining a certain capillary pore ratio (>0.05%) can ensure a higher oily sludge reduction rate, and controlling the appropriate capillary pore size (<2μm) can also improve the recovery effect of oil and water resources and increase the oily sludge reduction rate.

[0184] Examples 2I1-2I8

[0185] The same device and method as in Example 2A were used, but the device inclination angles were different, wherein the angle between the material forward direction and the horizontal direction was a positive angle, and the angle between the material forward direction and the horizontal direction was a negative angle. The oily sludge reduction rate and oil-water separation purity results corresponding to different device inclination angles are shown in Table 6 below:

[0186]

[0187] By comparison, it is found that the device can improve the oily sludge reduction effect and the separation and recovery purity of oil and water resources at the same time within the reasonable device inclination range (1-30°), and improve the operation and treatment effect of the device. When the device inclination is 10-20°, the device treatment effect is better, which can ensure that the oily sludge reduction rate is higher than 85%, while maintaining the water recovery purity higher than 98.5% and the oil recovery purity higher than 99.5%.

[0188] Embodiments 2J1-2J14

[0189] The same device and method as in Example 2A are used, but the height dimension of the first liquid port 33 of the oil droplet separation barrier structure and the height dimension of the second liquid port 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:

[0190]

[0191] By comparison, it is found that regulating the height of the first liquid port 33 and the second liquid port can effectively improve the purity of oil-water resource separation and recovery, and improve the separation performance and separation effect of the oily sludge reduction treatment device. When the height of the first liquid port is 0.5-3.0 microns, the purity of water resource recovery can be as high as 98.0% or more, and when the height of the second liquid port is 0.5-3.0 microns, the purity of oil resource recovery can be as high as 99.0% or more.

[0192] Compared with CN113173688B and CN114031255A, the present embodiment adopts segmented oil-water separation and recovery, and by setting a water droplet separation barrier structure and an oil droplet separation barrier structure, the purity of the separated and recovered water resources and oil resources is significantly improved, and the purities are respectively higher than 98% and 98.5%, and the segmented separation and recovery of oil and water is carried out by capillary self-priming, and the cost is significantly reduced; the present embodiment adopts segmented demulsification and high-temperature treatment of oily sludge, which significantly improves the treatment range of the oily sludge reduction treatment device, reduces the difficulty of oil-water separation and recovery, improves the adaptability to the oily sludge to be treated, improves the universality of the device, and enhances the promotion and application of the oily sludge reduction treatment device.

[0193] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes 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 amount of oily sludge, characterized in that: The device includes: A shell, wherein a dehydration chamber and a deoiling chamber are sequentially arranged inside the shell, the dehydration chamber and the deoiling chamber are connected, a feed port connected to the dehydration chamber and a discharge port connected to the deoiling chamber are respectively arranged at two ends of the shell, a dehydration capillary channel and a deoiling capillary channel connected to the dehydration chamber are respectively opened on the side wall of the dehydration chamber and the side wall of the deoiling chamber, and a heating component is arranged inside the side wall of the dehydration chamber and the side wall of the deoiling chamber; A stirring and conveying mechanism is arranged inside the shell and is used for stirring and conveying materials in the dehydration chamber and the deoiling chamber.

2. The oily sludge reduction treatment device according to claim 1 is characterized in that: A water collecting trough communicated with the dehydration capillary pores and an oil collecting trough communicated with the deoiling capillary pores are disposed on the outer side of the outer wall of the shell, and a first liquid drain port and a second liquid drain port are disposed at the bottom of the water collecting trough and the oil collecting trough, respectively.

3. The oily sludge reduction treatment device according to claim 2 is characterized in that: A separation water tank is arranged below the water collecting tank, and the separation water tank is connected with the water collecting tank through a connecting channel. A filter membrane stack is arranged in the connecting channel, and the filter membrane stack is permeable to water and oil-blocking. A third liquid discharge port is arranged at the bottom of the separation water tank.

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

5. The oily sludge reduction treatment device according to claim 4 is characterized in that: The first liquid discharge port is communicated with the oil collecting tank through a connecting pipeline.

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

7. The oily sludge reduction treatment device according to claim 1 is characterized in that: The pore diameters of the dehydration capillary channels and the deoiling capillary channels are 0.01-2 microns.

8. The oily sludge reduction treatment device according to claim 1 is characterized in that: Relative to the total volume of the side wall of the dehydration chamber, the volume of the dehydration capillary channels accounts for 0.05-4%, preferably 1-2%; relative to the total volume of the side wall of the deoiling chamber, the volume of the deoiling capillary channels accounts for 0.05-4%, preferably 1-2%.

9. 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 deoiling capillary channel is provided with a first hydrophobic coating.

10. The oily sludge reduction treatment device according to claim 1, characterized in that: A supporting foot is provided at the bottom of the shell, and the length of the supporting foot is adjustable so that the shell can be tilted so that the first end of the shell where the feed port is located is lower than the second end of the shell where the discharge port is located.

11. The oily sludge reduction treatment device according to claim 1, characterized in that: A second hydrophilic coating is provided on the inner wall of the dehydration chamber, and a plurality of oil droplet separation barrier structures are provided at one end of the dehydration capillary channel close to the dehydration chamber, and the oil droplet separation barrier structures include: A first baffle plate, wherein the lower end of the first baffle plate is connected to the inner wall of the dehydration chamber through a first bracket, the upper end of the first baffle plate is inclined toward the direction close to the feed port, and the first baffle plate vertically blocks at least one dehydration capillary channel, and a plurality of first liquid ports are formed in the first bracket; A second hydrophobic coating and a third hydrophilic coating, wherein the second hydrophobic coating and the third hydrophilic coating are respectively arranged on a side of the first baffle plate close to the discharge port and a side of the first baffle plate close to the feed port.

12. The oily sludge reduction treatment device according to claim 1, characterized in that: A third hydrophobic coating is provided on the inner wall of the deoiling chamber, and a plurality of water droplet separation barrier structures are provided at one end of the deoiling capillary channel close to the deoiling chamber, and the oil droplet separation barrier structure includes: A second baffle plate, wherein the upper end of the second baffle plate is connected to the inner wall of the deoiling chamber through a second bracket, the upper end of the second baffle plate is inclined toward the direction close to the feed port, and the second baffle plate vertically blocks at least one deoiling capillary channel, and a plurality of second liquid ports are formed in the second bracket; A fourth hydrophobic coating and a fourth hydrophilic coating, wherein the fourth hydrophobic coating and the fourth hydrophilic coating are respectively arranged on a side of the second baffle plate close to the feed port and a side of the second baffle plate close to the discharge port.

13. The oily sludge reduction treatment device according to claim 11 or 12, characterized in that: The heights of the first liquid passage opening and the second liquid passage opening are 0.5-3 microns.

14. A method for reducing the amount of oily sludge, using the device for reducing the amount of oily sludge according to any one of claims 1 to 13, characterized in that: The method includes: The oily sludge and demulsifier are fed into the dehydration chamber from the feed inlet; Heating, stirring and conveying the material in the dehydration chamber, leading out the first liquid generated in the dehydration chamber through the dehydration capillary channel, and allowing the dehydrated material to enter the deoiling chamber; Heating, stirring and conveying the dehydrated material in the deoiling chamber, and conducting the second liquid in the deoiling chamber through the deoiling capillary channel; The solid product produced in the deoiling chamber is discharged through the discharge port.

15. The method for reducing the amount of oily sludge according to claim 14, characterized in that: The method also includes collecting the first liquid and the second liquid, and performing oil-water separation on the first liquid.

16. The method for reducing the amount of oily sludge according to claim 14, characterized in that: The demulsifier is selected from at least one of sodium lignin sulfonate, tetrasodium ethylenediaminetetraacetic acid, polyethylene terephthalate, polyquaternary ammonium salt, polyether polyquaternary ammonium salt, terephthalic acid, glycerol, nonylphenol polyoxyethylene ether, tetraphenyl boric acid amine, polyacrylate, dimethyl silicone oil, sodium dodecylbenzene sulfonate, sodium polyacrylate, carbon tetrachloride, butanediol, hexadecyltrimethylammonium bromide, and alkylphenol polyoxyethylene ether.

17. The method for reducing the amount of oily sludge according to claim 14, characterized in that: The amount of the demulsifier added relative to the oily sludge is 0.5-10 g / L, preferably 2-5 g / L.

18. The method for reducing the amount of oily sludge according to claim 14, characterized in that: The temperature in the dehydration chamber is 30-120°C, preferably 40-50°C; the temperature in the deoiling chamber is 30-120°C, preferably 70-80°C.

19. The method for reducing the amount of oily sludge according to claim 14, characterized in that: The residence time of the oily sludge in the dewatering chamber is 0.5-6h, preferably 1-3h, and the residence time of the oily sludge in the deoiling chamber is 0.5-6h, preferably 1-3h.

20. The method for reducing the amount of oily sludge according to claim 14, 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 drop contact angle of the first hydrophilic coating ranges from 2-25°, preferably 5-10°, and the water drop contact angle of the first hydrophobic coating ranges from 95-130°, preferably 105-115°.

21. The method for reducing the amount of oily sludge according to claim 14, characterized in that: The method further includes tilting the shell so that a first end of the shell where the feed port is located is lower than a second end of the shell where the discharge port is located.

22. The method for reducing the amount of oily sludge according to claim 21, characterized in that: The inclination angle of the shell relative to the horizontal plane is 1-30°.

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