Oil removal device for high-oil high-temperature wastewater in petroleum refining

Abstract

The utility model discloses a kind of petroleum refining high oil content high-temperature wastewater oil removal devices, including oil removal tank and oil removal machine, oil removal machine includes main shaft, multiple oil slick adsorption discs of interval arrangement on main shaft, the floating oil guide vane mechanism of driving non-continuous phase floating oil to flow to oil slick adsorption disc flow channel in cooperation with oil slick adsorption disc, oil slick scraping mechanism in cooperation with oil slick adsorption disc, oil slick adsorption disc is by oil slick adsorption surface a, oil slick adsorption surface b, oil slick adsorption surface c constitutes cylindrical surface and disc surface two-way oil slick adsorption surface, oil slick scraping mechanism includes the cylindrical surface oil slick scraping plate in cooperation with oil slick adsorption surface c and the end surface oil slick scraping plate in cooperation with oil slick adsorption surface a, oil slick adsorption surface b, cylindrical surface oil slick scraping plate is fixed in the upper of end surface oil slick scraping plate, end surface oil slick scraping plate is connected with oil collecting groove, oil removal machine is installed on the upper portion of oil removal tank, oil slick adsorption disc part is immersed in floating oil. The utility model is high in efficiency to handle non-continuous phase floating oil, high in degree of automation, low in operation and maintenance cost, adapt to high oil content high-temperature refining wastewater characteristics.

Description

Technical Field

[0001] This utility model relates to the field of oil-water-gas-solid multiphase separation and purification of wastewater, specifically an oil removal device and treatment method for high-oil-content, high-temperature wastewater from petroleum refining, which is particularly suitable for the rapid pretreatment of petroleum refining wastewater. Background Technology

[0002] Petroleum refining wastewater originates from processes such as electrostatic desalination, atmospheric and vacuum distillation, and catalytic cracking. It is a multiphase system containing suspended oil, emulsified oil, dissolved organic matter, and salts. Major pollutants include petroleum hydrocarbons, COD, BOD, sulfides, volatile phenols, suspended solids, and ammonia nitrogen. Petroleum hydrocarbon concentrations in this type of wastewater can reach over 500 mg / L, and the water temperature can reach 70°C. Furthermore, the floating oil exhibits poor dispersion on the water surface, forming discontinuous agglomerates. Currently, the conventional treatment process is air flotation oil removal + coagulation sedimentation + biological treatment. In air flotation oil removal, surface oil is mostly skimmed, resulting in high water content in the obtained oil. Due to the discontinuous agglomeration of the oil, it accumulates and cannot be removed in time, leading to high oil content in the effluent and high energy consumption of the air flotation system. Other oil adsorption separation methods, such as belt filters and disc filters, also have relatively poor adsorption and oil removal effects in this type of discontinuous phase oil situation, affecting the subsequent solid-liquid separation and biological treatment processes. Flotation and sedimentation systems require a large area, which is not conducive to project expansion and renovation. Utility Model Content

[0003] Therefore, in view of the above-mentioned problems in the treatment of petroleum refining wastewater, this utility model aims to provide an oil removal device for high-oil-content and high-temperature wastewater from petroleum refining that is adapted to the characteristics of such wastewater. This oil removal device has the characteristics of good adsorption and oil removal effect, small footprint, and low energy consumption.

[0004] Specifically, an oil removal device for high-oil-content, high-temperature wastewater from petroleum refining includes an oil removal tank and an oil removal machine. The oil removal machine includes a main shaft, a main shaft driver (preferably a motor), multiple floating oil adsorption discs spaced apart on the main shaft, a floating oil guide impeller mechanism that cooperates with the floating oil adsorption discs to drive discontinuous floating oil into the flow channel of the floating oil adsorption discs, and an oil scraping mechanism that cooperates with the floating oil adsorption discs. The floating oil adsorption discs are composed of a cylindrical surface and a disc surface forming a bidirectional floating oil adsorption surface, consisting of a floating oil adsorption surface a, a floating oil adsorption surface b, and a floating oil adsorption surface c. The oil scraping mechanism includes a cylindrical oil scraper that cooperates with the floating oil adsorption surface c and an end-face oil scraper that cooperates with the floating oil adsorption surfaces a and b. The cylindrical oil scraper is fixed above the end-face oil scraper, and an oil collection tank is connected to the end-face oil scraper. The oil removal machine is installed on the upper part of the oil removal tank, and the floating oil adsorption discs are partially immersed in the floating oil. The materials of the oil removal machine and the oil removal tank are suitable for high-oil-content, high-temperature wastewater.

[0005] Optionally, the oil removal machine is located at the rear of the oil removal tank, and the floating oil guide impeller mechanism includes a rotating shaft on which several floating oil guide impellers are mounted. The floating oil guide impellers extend to the flow channel of the floating oil adsorption plate. The rotating shaft is connected to a rotating shaft driver, and the floating oil guide impellers and the floating oil adsorption plate rotate in opposite directions.

[0006] The rotating shaft driver and the main shaft driver are both the same motor, and the rotating shaft is driven by the main shaft through gear meshing.

[0007] Optionally, the oil adsorption plate is composed of oil adsorption surface a, oil adsorption surface b and oil adsorption surface c forming a bidirectional oil adsorption surface of cylindrical and disc surfaces, wherein oil adsorption surface a and oil adsorption surface b are the end faces on both sides, and oil adsorption surface c is a cylindrical surface.

[0008] Optionally, the oil scraping mechanism includes a cylindrical oil scraper that mates with the floating oil adsorption surface c and an end-face oil scraper that mates with the floating oil adsorption surfaces a and b; the cylindrical oil scraper is fixed above the end-face oil scraper, and the end-face oil scraper has an oil guide groove communicating with the oil collection groove. Preferably, the oil guide groove is a V-shaped groove.

[0009] Optionally, the cylindrical scraper is fixed at an angle, and the oil outlet side of the cylindrical scraper and the oil outlet side of the end scraper are connected to the oil collection groove after being gathered.

[0010] Optionally, the oil adsorption plate includes two parallel unit disks and a cylindrical panel surrounding the two unit disks to make the oil adsorption plate cylindrical. The outer surface of one unit disk is the oil adsorption surface a, the outer surface of the other unit disk is the oil adsorption surface b, and the outer surface of the cylindrical panel is the oil adsorption surface c.

[0011] Optionally, a cooling spray pipe is provided below the oil scraper on the end face of the oil adsorption plate.

[0012] Preferably, the oil adsorption plate (at least oil adsorption surface a, oil adsorption surface b and oil adsorption surface c) is made of oleophilic and hydrophobic stainless steel with a thickness of not less than 0.5 mm.

[0013] This utility model has the following advantages:

[0014] This utility model describes an oil removal device for high-oil-content, high-temperature wastewater from petroleum refining. Addressing the characteristics of discontinuous, clustered oil dispersion on the water surface and the high-temperature conditions, it provides an oil adsorption plate with bidirectional adsorption surfaces of both cylindrical and disc surfaces. This, along with an oil guide impeller mechanism that works in conjunction with multiple spaced-apart oil adsorption plates to drive discontinuous oil flow towards the adsorption plate channels, solves the problem of difficult collection of discontinuous oil in petroleum refining wastewater. This ensures effective coagulation in subsequent water treatment. The provided oil adsorption plate, composed of two unit discs and a cylindrical panel, also possesses the advantages of high-temperature resistance and non-deformation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a top view of the present invention (a, b, and c in the figure refer to oil adsorption surface a, oil adsorption surface b, and oil adsorption surface c, respectively).

[0017] Figure 3 This is a three-dimensional schematic diagram of the oil adsorption plate described in this utility model;

[0018] Figure 4 This is a schematic diagram showing the disassembled oil adsorption plate of this utility model;

[0019] In the diagram: 1. Oil removal tank; 2. Oil removal machine; 3. Main shaft; 4. Main shaft driver; 5. Floating oil adsorption plate; 51. Unit plate; 52. Column plate; 6. Floating oil adsorption plate flow channel; 7. Floating oil guide impeller mechanism; 8. Oil scraping mechanism; 9. Column surface oil scraper; 10. End face oil scraper; 11. Oil collection trough; 12. Water inlet; 13. Guide plate; 14. Guide vane; 15. Oil outlet; 16. Water outlet; 17. Water outlet pipe inlet; 18. Sludge discharge pipe. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0021] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0022] As described in the background section, petroleum refining wastewater originates from processes such as electrostatic desalination, atmospheric and vacuum distillation, and catalytic cracking. It is a multiphase system integrating suspended oil, emulsified oil, dissolved organic matter, and salts. Major pollutants include petroleum hydrocarbons, COD, BOD, sulfides, volatile phenols, suspended solids, and ammonia nitrogen. Petroleum hydrocarbon concentrations in this type of wastewater can reach over 500 mg / L, and the water temperature can reach 70°C. Furthermore, the floating oil exhibits poor dispersion on the water surface, forming discontinuous agglomerates. Currently, the conventional treatment process is air flotation oil removal + coagulation sedimentation + biological treatment. In air flotation oil removal, surface oil is mostly skimmed, resulting in high water content in the obtained oil. Due to the discontinuous agglomeration of the oil, it accumulates and cannot be removed in time, leading to high oil content in the effluent and high energy consumption of the air flotation system. Other oil adsorption separation methods, such as belt and disc oil separators, also have relatively poor adsorption and oil removal effects in this type of discontinuous phase oil situation, affecting the subsequent solid-liquid separation and biological treatment processes. Flotation and sedimentation systems require a large area, which is not conducive to project expansion and renovation.

[0023] Based on the aforementioned problems in the treatment of petroleum refining wastewater, this embodiment provides an oil removal device for high-oil-content, high-temperature wastewater from petroleum refining processes, such as... Figure 1 and Figure 2 As shown, the oil removal device includes an oil removal tank 1 and an oil removal machine 2. The oil removal machine 2 is installed on the upper part of the oil removal tank 1. The oil removal machine includes a main shaft 3, a main shaft driver 4, a floating oil guide impeller mechanism 7, and an oil scraping mechanism 8.

[0024] Multiple oil adsorption plates 5 are arranged at intervals on the main shaft 3. The oil adsorption plates 5 are partially immersed in the oil in the oil removal tank. An oil adsorption plate flow channel 6 is formed between adjacent oil adsorption plates 5. The cylindrical surface and the disc surface of the oil adsorption plate 5 form a bidirectional oil adsorption surface.

[0025] The spindle driver 4 is connected to the spindle 3 and is used to drive the spindle to rotate;

[0026] The floating oil guide impeller mechanism 7 is installed upstream of the main shaft and is used to drive the discontinuous phase floating oil to the floating oil adsorption disk channel 6.

[0027] The oil scraping mechanism 8 cooperates with the floating oil adsorption plate to scrape off the oil adsorbed on the bidirectional floating oil adsorption surface;

[0028] The oil collection trough 11 is connected to the oil outlet side of the oil scraping mechanism 8;

[0029] The oil removal machine is located at the rear of the oil removal tank. The floating oil guide impeller mechanism 7 includes a rotating shaft on which several floating oil guide impellers are mounted. The floating oil guide impellers are arranged at equal intervals and staggered. When the floating oil guide impeller rotates to the floating oil suction cup channel, the floating oil guide impeller extends to the floating oil suction cup channel. The rotating shaft is connected to a rotating shaft driver. The floating oil guide impellers and the floating oil suction cup rotate in opposite directions. During use, the position of the rotating shaft is not lower than the liquid level in the oil removal tank (i.e., the rotating shaft is located at or above the liquid level). The rotating shaft driver and the main shaft driver are both the same motor. The rotating shaft is driven by the main shaft through gear meshing.

[0030] Furthermore, such as Figure 2 As shown, the oil absorption plate 5 comprises three oil absorption surfaces: a, b, and c, forming a bidirectional oil absorption surface consisting of a cylindrical surface and a disc surface. Oil absorption surfaces a and b are the two end faces, respectively, and oil absorption surface c is a cylindrical surface. The oil absorption plate (at least oil absorption surfaces a, b, and c) is made of oleophilic and hydrophobic stainless steel with a thickness of not less than 0.5 mm.

[0031] Furthermore, a guide plate 13 is provided on the water outlet side of the oil removal tank inlet 12. The oil removal tank inlet is on one side of the principle oil removal machine. The water outlet 16 of the oil removal tank has its water outlet pipe inlet 17 located at the middle of the oil level in the oil removal tank. A sludge discharge hopper is provided at the bottom of the oil removal tank, and the sludge discharge hopper has a sludge discharge pipe 18.

[0032] The aforementioned technical features include an oil adsorption plate with both cylindrical and disc-shaped bidirectional oil adsorption surfaces, and an oil guide impeller mechanism that works in conjunction with the oil adsorption plate to drive discontinuous phase oil flow towards the oil adsorption plate channel. This solves the problem of difficult collection of discontinuous phase oil in petroleum refining wastewater, ensuring the coagulation reaction effect in subsequent water treatment. The cylindrical surface of the oil adsorption plate draws oil in front, making it easy for oil to adhere, while simultaneously dragging the oil towards the adsorption surface. The large adsorption area of ​​the disc surfaces on both sides, combined with the impeller's assistance in propelling the oil into the channel between the discs, allows for the adsorption of a large amount of oil. In operation, the rotation of the main shaft driver 4 drives the main shaft and the oil guide impeller mechanism to rotate in opposite directions (e.g., ...). Figure 1As shown, the rotating shaft rotates clockwise, while the floating oil guide impeller mechanism rotates counterclockwise. The rotating floating oil guide impeller agitates the floating oil into the flow channel of the floating oil adsorption discs. The floating oil is adsorbed by the cylindrical and end faces of the floating oil adsorption discs. When the floating oil adsorption discs with adsorbed floating oil rotate to the oil scraping plate area, the end face oil scraping plate and cylindrical face oil scraping plate scrape off the floating oil and guide it into the oil collection tank, thereby achieving oil removal from the wastewater.

[0033] To quickly and efficiently scrape off the floating oil adsorbed on the oil adsorption plate, in one embodiment, the oil scraping mechanism 8 includes a cylindrical oil scraper 9 that mates with the oil adsorption surface c and an end-face oil scraper 10 that mates with the oil adsorption surfaces a and b. The cylindrical oil scraper 9 is fixed above the end-face oil scraper 10, and the end-face oil scraper 10 has an oil guide groove communicating with the oil collection groove 11. Preferably, the oil guide groove is a V-shaped groove. Optionally, the cylindrical oil scraper 9 is fixed at an angle, and the oil outlet side of the cylindrical oil scraper and the oil outlet side of the end-face oil scraper converge and connect to the oil collection groove 11.

[0034] The aforementioned technical features, through the two end-face scraper plates and the inclined cylindrical scraper plate, can quickly and efficiently scrape off floating oil; thus, the oil adsorbed on the floating oil adsorption plate is scraped off and discharged into the oil collection tank 11, facilitating the collection of floating oil.

[0035] To improve the adsorption of floating oil and prevent the oil adsorption plate from deforming at high temperatures, in one embodiment, such as... Figure 3 and Figure 4 As shown, the oil adsorption plate 5 includes two parallel unit plates 51 and a cylindrical plate 52 surrounding the two unit plates to make the oil adsorption plate 5 cylindrical. The outer surface of one unit plate is the oil adsorption surface a, the outer surface of the other unit plate is the oil adsorption surface b, and the outer surface of the cylindrical plate is the oil adsorption surface c.

[0036] The aforementioned technical features enable the collection of floating oil from multiple surfaces, and the floating oil adsorption plate is composed of two unit plates and a column panel, which is strong, resistant to high temperatures and does not deform.

[0037] Because the contact area between the end-face scraper and the floating oil adsorption surface a or b is large, friction occurs during scraping. The heat generated under high temperatures can cause deformation of the floating oil adsorption disc or reduce its adsorption efficiency. Therefore, in one embodiment, a cooling spray pipe is provided below the end-face scraper of the floating oil adsorption disc. Cooling liquid is sprayed onto the disc surface through the spray pipe to achieve cooling, preventing excessively high disc temperature from causing deformation or reducing the adsorption capacity of the floating oil.

[0038] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An oil removal device for high-oil-content, high-temperature wastewater from petroleum refining, comprising an oil removal tank and an oil removal machine, characterized in that: The oil separator is installed on the upper part of the oil removal tank, and the oil separator includes... Main shaft (3), on which multiple oil adsorption plates (5) are arranged at intervals. The oil adsorption plates (5) are partially immersed in the oil in the oil removal tank. An oil adsorption plate flow channel (6) is formed between adjacent oil adsorption plates (5). The cylindrical surface and the disc surface of the oil adsorption plate (5) form a bidirectional oil adsorption surface. A spindle driver (4) is connected to the spindle (3) and is used to drive the spindle to rotate; The floating oil guide impeller mechanism (7) is installed upstream of the main shaft and is used to drive the discontinuous phase floating oil to the floating oil adsorption disk channel (6). The oil scraping mechanism (8) cooperates with the oil adsorption plate to scrape off the oil adsorbed on the bidirectional oil adsorption surface; The oil collection trough (11) is connected to the oil outlet side of the oil scraping mechanism (8).

2. The oil removal device for high-oil-content, high-temperature wastewater from petroleum refining as described in claim 1, characterized in that: The oil removal machine is located at the rear of the oil removal tank. The floating oil guide impeller mechanism (7) includes a rotating shaft on which several floating oil guide impellers are installed. The rotating shaft is connected to a rotating shaft driver. The floating oil guide impellers and the floating oil adsorption plate rotate in opposite directions.

3. The oil removal device for high-oil-content, high-temperature wastewater from petroleum refining as described in claim 1, characterized in that: The oil adsorption plate (5) is composed of a floating oil adsorption surface a, a floating oil adsorption surface b and a floating oil adsorption surface c, forming a two-way floating oil adsorption surface of cylindrical and disc surfaces. Floating oil adsorption surface a and floating oil adsorption surface b are the end faces on both sides, and floating oil adsorption surface c is a cylindrical surface.

4. The oil removal device for high-oil-content, high-temperature wastewater from petroleum refining as described in claim 2, characterized in that: The oil scraping mechanism (8) includes a cylindrical oil scraper (9) that cooperates with the floating oil adsorption surface c and an end face oil scraper (10) that cooperates with the floating oil adsorption surface a and the floating oil adsorption surface b; the cylindrical oil scraper (9) is fixed above the end face oil scraper (10), and the end face oil scraper (10) has an oil guide groove that communicates with the oil collection groove (11).

5. The oil removal device for high-oil-content, high-temperature wastewater from petroleum refining as described in claim 4, characterized in that: The oil guide groove is a V-shaped groove.

6. The oil removal device for high-oil-content, high-temperature wastewater from petroleum refining as described in claim 4, characterized in that: The cylindrical scraper (9) is fixed at an angle, and the oil outlet side of the cylindrical scraper and the oil outlet side of the end scraper are connected to the oil collection groove (11) after they converge.

7. The oil removal device for high-oil-content, high-temperature wastewater from petroleum refining as described in claim 4, characterized in that: The oil adsorption plate (5) includes two parallel unit plates and a cylindrical plate surrounding the two unit plates to make the oil adsorption plate (5) cylindrical. The outer surface of one unit plate is the oil adsorption surface a, the outer surface of the other unit plate is the oil adsorption surface b, and the outer surface of the cylindrical plate is the oil adsorption surface c.

8. The oil removal device for high-oil-content, high-temperature wastewater from petroleum refining as described in claim 4, characterized in that: A cooling spray pipe is installed below the oil scraper on the end face of the oil adsorption plate.

9. The oil removal device for high-oil-content, high-temperature wastewater from petroleum refining as described in claim 2, characterized in that: The oil removal tank has a water inlet on the side away from the oil removal machine. A guide plate fixed to the oil storage tank is provided on the water outlet side of the water inlet. The inlet of the water outlet of the oil removal tank is located at the middle of the oil level in the oil removal tank. A sludge discharge hopper is provided at the bottom of the oil removal tank.

10. The oil removal device for high-oil-content, high-temperature wastewater from petroleum refining as described in any one of claims 1-9, characterized in that: The oil adsorption plate is made of oleophilic and hydrophobic stainless steel with a thickness of not less than 0.5 mm.

Images