Petroleum refining high-oil-content high-temperature wastewater deoiling device

Abstract

The invention discloses a petroleum refining high-oil-content high-temperature wastewater oil removal device which comprises an oil removal tank and an oil removal machine, the oil removing machine comprises a main shaft, a plurality of floating oil adsorption discs arranged on the main shaft at intervals, a floating oil guide impeller mechanism matched with the floating oil adsorption discs and used for driving discontinuous-phase floating oil to flow towards floating oil adsorption disc flow channels, and an oil scraping mechanism matched with the floating oil adsorption discs. Wherein the floating oil adsorption disc forms a cylindrical surface and disc surface bidirectional floating oil adsorption surface through a floating oil adsorption surface a, a floating oil adsorption surface b and a floating oil adsorption surface c, the oil scraping mechanism comprises a cylindrical surface oil scraping plate matched with the floating oil adsorption surface c and an end surface oil scraping plate matched with the floating oil adsorption surface a and the floating oil adsorption surface b, and the cylindrical surface oil scraping plate is fixed above the end surface oil scraping plate. The oil removing machine is installed on the upper portion of the oil removing box, and the floating oil adsorption disc is partially immersed in floating oil. The device has the characteristics of high discontinuous phase floating oil treatment efficiency, high automation degree, low operation and maintenance cost and adaptability to high-oil-content and high-temperature refining wastewater.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-phase separation and purification of oily water and gas-solid wastewater, and specifically to an oil removal device and treatment method for high-oil-content and high-temperature wastewater in petroleum refining, which is particularly suitable for the rapid pretreatment of petroleum refining wastewater. Background Art

[0002] Petroleum refining wastewater comes from processes such as electro-de-salting, atmospheric and vacuum distillation, and fluid catalytic cracking. It is a multi-phase system integrating suspended oil, emulsified oil, dissolved organic matter, and salt. The main pollutants include petroleum, COD, BOD, sulfide, volatile phenol, suspended solids, and ammonia nitrogen. The petroleum content in such wastewater can reach more than 500 mg / L, the water temperature can reach 70 °C, and the floating oil has poor dispersion on the water surface and is distributed in discontinuous clusters. Currently, the conventional treatment process is air flotation for oil removal + coagulation sedimentation + biochemical treatment. In air flotation for oil removal, most of the surface floating oil uses a skimmer, and the obtained floating oil has a high water content. Moreover, due to the discontinuous cluster distribution of the floating oil, the floating oil accumulates and cannot be removed in time, resulting in high oil content in the effluent and high energy consumption of the air flotation system. Other belt oil removal machines and thin plate disk oil removal machines for floating oil adsorption and separation also have relatively poor adsorption and oil removal effects in such discontinuous phase floating oil situations, affecting the subsequent solid-liquid separation and biochemical process effects. The air flotation and sedimentation systems have a large floor area, which is not conducive to project reconstruction and expansion. Summary of the Invention

[0003] Therefore, in view of the above problems existing in the treatment of petroleum refining wastewater, the present invention aims to provide an oil removal device for high-oil-content and high-temperature wastewater in petroleum refining that adapts to the characteristics of such wastewater. This oil removal device has the characteristics of good adsorption and oil removal effect, small floor area, and low energy consumption.

[0004] Specifically, an oil removal device for high-oil-content and high-temperature wastewater in 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), a plurality of floating oil adsorption disks arranged at intervals on the main shaft, a floating oil guide vane mechanism that cooperates with the floating oil adsorption disks to drive the discontinuous phase floating oil to flow into the flow channel of the floating oil adsorption disks, and a scraping mechanism that cooperates with the floating oil adsorption disks. The floating oil adsorption disks are composed of a floating oil adsorption surface a, a floating oil adsorption surface b, and a floating oil adsorption surface c to form a double-sided floating oil adsorption surface of a cylindrical surface and a disk surface. The scraping mechanism includes a cylindrical surface scraping plate that cooperates with the floating oil adsorption surface c and an end surface scraping plate that cooperates with the floating oil adsorption surfaces a and b. The cylindrical surface scraping plate is fixed above the end surface scraping plate, and the end surface scraping plate is connected to an oil collecting tank at the back. The oil removal machine is installed on the upper part of the oil removal tank, and part of the floating oil adsorption disks is immersed in the floating oil. The materials of the oil removal machine and the oil removal tank are suitable for high-oil-content and high-temperature wastewater.

[0005] Optionally, the oil removal machine is arranged at the rear of the oil removal tank. The floating oil diversion impeller mechanism includes a rotating shaft, on which several floating oil diversion impellers are installed. The floating oil diversion impellers extend to the flow channel of the floating oil adsorption disc. The rotating shaft is connected with a rotating shaft driver, and the floating oil diversion impellers rotate in the opposite direction to the floating oil adsorption disc. The rotating shaft driver and the main shaft driver are both the same motor, and the rotating shaft is meshed and driven with the main shaft through gears.

[0006] Optionally, the oil adsorption disc is composed of a floating oil adsorption surface a, a floating oil adsorption surface b and a floating oil adsorption surface c to form a double-sided floating oil adsorption surface of a cylindrical surface and a disc surface. Among them, the floating oil adsorption surface a and the floating oil adsorption surface b are respectively the end faces on both sides, and the floating oil adsorption surface c is the cylindrical surface.

[0007] Optionally, the oil scraping mechanism includes a cylindrical surface oil scraping plate matched with the floating oil adsorption surface c and an end face oil scraping plate matched with the floating oil adsorption surface a and the floating oil adsorption surface b; the cylindrical surface oil scraping plate is fixed above the end face oil scraping plate, and the end face oil scraping plate has an oil guide groove communicated with the oil collecting tank. Preferably, the oil guide groove is a V-shaped groove.

[0008] Optionally, the cylindrical surface oil scraping plate is fixed obliquely, and the oil outlet sides of the cylindrical surface oil scraping plate and the end face oil scraping plate are gathered and then connected to the oil collecting tank.

[0009] Optionally, the floating oil adsorption disc includes two unit discs arranged in parallel and a cylindrical panel wound around the two unit discs to make the floating oil adsorption disc cylindrical. The outer surface of one unit disc is the floating oil adsorption surface a, the outer surface of the other unit disc is the floating oil adsorption surface b, and the outer surface of the cylindrical panel is the floating oil adsorption surface c.

[0010] Optionally, a disc surface cooling spray pipe is arranged below the end face oil scraping plate of the floating oil adsorption disc.

[0011] Preferably, the material of the floating oil adsorption disc (at least the floating oil adsorption surface a, the floating oil adsorption surface b and the floating oil adsorption surface c) is oil-loving and water-repellent stainless steel material, and the thickness is not less than 0.5 mm.

[0012] The present invention has the following advantages: The oil removal device for high oil-content and high-temperature wastewater in petroleum refining of the present invention aims at the characteristics that the floating oil has poor dispersion on the water surface and shows a discontinuous agglomerated distribution and the high-temperature characteristics. By providing a floating oil adsorption disc with a double-sided floating oil adsorption surface of a cylindrical surface and a disc surface, and a floating oil diversion impeller mechanism that cooperates with multiple spaced floating oil adsorption discs to drive the discontinuous-phase floating oil to flow towards the flow channel of the floating oil adsorption disc, the problem that the discontinuous-phase floating oil in petroleum refining wastewater is not easy to collect is solved, and the coagulation reaction effect in the subsequent water treatment is ensured. The provided floating oil adsorption disc is composed of two unit discs and a cylindrical panel, and also has the advantage of being resistant to high temperature and not deforming. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a top view schematic diagram of the present invention (a, b, and c in the figure respectively refer to the floating oil adsorption surface a, the floating oil adsorption surface b, and the floating oil adsorption surface c); Figure 3 is a three-dimensional schematic diagram of the floating oil adsorption disc of the present invention; Figure 4 is a disassembled schematic diagram of the floating oil adsorption disc of the present invention; In the figure: 1, oil removal tank; 2, oil remover; 3, main shaft; 4, main shaft driver; 5, floating oil adsorption disc; 51, unit disc; 52, column panel; 6, floating oil adsorption disc flow channel; 7, floating oil diversion impeller mechanism; 8, oil scraping mechanism; 9, column surface oil scraping plate; 10, end face oil scraping plate; 11, oil collecting tank; 12, water inlet; 13, guide plate 14, guide vane; 15, oil discharge port; 16, water outlet; 17, water inlet of the water outlet pipe; 18, sludge discharge pipe. Detailed implementation manners

[0014] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where 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 by referring to the drawings are exemplary and are intended to explain the present application, and should not be construed as a limitation to the present application.

[0015] In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0016] As described in the background art, the petroleum refining wastewater comes from processes such as electro - desalting, atmospheric and vacuum distillation, and fluid catalytic cracking. It is a multiphase system integrating suspended oil, emulsified oil, dissolved organic matter, and salt. The main pollutants include petroleum - based substances, COD, BOD, sulfides, volatile phenols, suspended solids, and ammonia nitrogen, etc. In this type of wastewater, the petroleum - based substances can reach more than 500 mg / L, the water temperature can reach 70 °C, and the floating oil has poor dispersion on the water surface, showing a discontinuous agglomerated distribution. Currently, the conventional treatment process is air - flotation oil removal + coagulation precipitation + biochemical treatment. In air - flotation oil removal, most of the surface floating oil uses an oil skimmer, and the obtained floating oil has a high water content. Moreover, due to the discontinuous agglomerated distribution of the floating oil, the floating oil accumulates and cannot be removed in time, resulting in high oil content in the effluent and high energy consumption of the air - flotation system. Other belt - type oil removal machines and disk - type oil removal machines used for floating oil adsorption and separation also have poor adsorption and oil removal effects in such non - continuous - phase floating oil situations, affecting the subsequent solid - liquid separation and biochemical process effects. The air - flotation and precipitation systems have a large floor area, which is not conducive to project reconstruction and expansion.

[0017] Based on the above - mentioned problems existing in the treatment of petroleum refining wastewater, this embodiment provides an oil removal device for high - oil - content and high - temperature petroleum refining wastewater, as Figure 1 and Figure 2 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 guiding impeller mechanism 7, and an oil scraping mechanism 8; A plurality of floating - oil adsorption disks 5 are arranged at intervals on the main shaft 3. The floating - oil adsorption disks 5 are partially immersed in the floating oil in the oil removal tank. A floating - oil adsorption disk flow channel 6 is formed between adjacent floating - oil adsorption disks 5. The cylindrical surface and the disk surface of the floating - oil adsorption disk 5 form a two - way floating - oil adsorption surface; The main shaft driver 4 is connected to the main shaft 3 and is used to drive the main shaft to rotate; The floating - oil guiding impeller mechanism 7 is installed upstream of the main shaft and is used to drive the non - continuous - phase floating oil to flow into the floating - oil adsorption disk flow channel 6; The oil scraping mechanism 8 cooperates with the floating - oil adsorption disk and is used to scrape off the oil substances adsorbed on the two - way floating - oil adsorption surface; The oil collection tank 11 is connected to the oil outlet side of the oil scraping mechanism 8; The oil remover is arranged at the rear of the oil removal tank. The floating oil diversion impeller mechanism 7 includes a rotating shaft, and several floating oil diversion impellers are installed on the rotating shaft. The several floating oil diversion impellers are arranged at equal intervals and staggeredly. When the floating oil diversion impeller rotates to the floating oil suction cup flow channel, the floating oil diversion impeller extends to the floating oil adsorption disc flow channel. The rotating shaft is connected with a rotating shaft driver. The floating oil diversion impeller and the floating oil adsorption disc rotate in opposite directions. During use, the position of the rotating shaft is not lower than the liquid level in the oil removal tank (that is, 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, and the rotating shaft is meshed and driven with the main shaft through gears.

[0018] Further, as Figure 2 shown, the oil adsorption disc 5 is composed of a floating oil adsorption surface a, a floating oil adsorption surface b and a floating oil adsorption surface c to form a double-sided floating oil adsorption surface of a cylindrical surface and a disc surface. Among them, the floating oil adsorption surface a and the floating oil adsorption surface b are respectively the end faces on both sides, and the floating oil adsorption surface c is a cylindrical surface; the material of the floating oil adsorption disc (at least the floating oil adsorption surface a, the floating oil adsorption surface b and the floating oil adsorption surface c) is oil-loving and hydrophobic stainless steel material, and the thickness is not less than 0.5 mm Further, a flow guide plate 13 is arranged on the water outlet side of the water inlet 12 of the oil removal tank. The water inlet of the oil removal tank is on the side away from the oil remover. The water inlet 17 of the water outlet pipe of the water outlet 16 of the oil removal tank is arranged at the middle position with a high liquid level in the oil removal tank. A sludge discharge hopper is arranged at the lower part of the oil removal tank, and the sludge discharge hopper is provided with a sludge discharge pipe 18.

[0019] For the above technical features, a floating oil adsorption disc with a double-sided floating oil adsorption surface of a cylindrical surface and a disc surface and a floating oil diversion impeller mechanism that cooperates with the floating oil adsorption disc to drive the discontinuous-phase floating oil to flow towards the floating oil adsorption disc flow channel can solve the problem that the discontinuous-phase floating oil in petroleum refining wastewater is not easy to collect and ensure the coagulation reaction effect in the subsequent water treatment; the cylindrical surface of the floating oil adsorption disc sucks oil head-on, and the floating oil is easy to adhere, and at the same time drags the floating oil to flow towards the adsorption surface. The adsorption areas of the two side disc surfaces are large. When the floating oil is boosted by the diversion impeller to enter the flow channel between the discs, the disc surfaces can adsorb a large amount of floating oil. During use, through the rotation of the main shaft driver 4, the main shaft and the rotating shaft of the floating oil diversion impeller mechanism are driven to rotate in opposite directions (as Figure 1 shown, the rotating shaft rotates clockwise, and the rotating direction of the floating oil diversion impeller mechanism is counterclockwise). The rotating floating oil diversion impeller stirs the floating oil into the floating oil adsorption disc flow channel between the floating oil adsorption discs, and the floating oil is adsorbed on the cylindrical surface and the end face of the floating oil adsorption disc. When the floating oil adsorption disc with adsorbed floating oil rotates to the scraper area, the end face scraper and the cylindrical surface scraper scrape off the floating oil and divert it into the oil collecting tank, so as to realize the oil removal of the wastewater.

[0020] In order to quickly and efficiently scrape off the floating oil adsorbed on the floating oil adsorption disc, in one embodiment, the oil scraping mechanism 8 includes a cylindrical oil scraping plate 9 that cooperates with the floating oil adsorption surface c, and an end face oil scraping plate 10 that cooperates with the floating oil adsorption surface a and the floating oil adsorption surface b; the cylindrical oil scraping plate 9 is fixed above the end face oil scraping plate 10, and the end face oil scraping plate 10 has an oil guiding groove communicating with the oil collecting groove 11; preferably, the oil guiding groove is a V-shaped groove. Optionally, the cylindrical oil scraping plate 9 is inclined and fixed, and the oil outlet side of the cylindrical oil scraping plate and the oil outlet side of the end face oil scraping plate are gathered and connected to the oil collecting groove 11.

[0021] The above technical features can quickly and efficiently scrape off the floating oil through two end face oil scraping plates and an inclined cylindrical oil scraping plate; the adsorbed oil on the floating oil adsorption disc can be scraped off and discharged into the oil collecting groove 11, facilitating the collection of floating oil.

[0022] In order to improve the adsorption of floating oil and prevent the floating oil adsorption disc from deforming at high temperatures, in one embodiment, as Figure 3 and Figure 4 shown, the floating oil adsorption disc 5 includes two unit discs 51 arranged in parallel and a cylindrical panel 52 wound around the two unit discs to make the floating oil adsorption disc 5 cylindrical. The outer surface of one unit disc is the floating oil adsorption surface a, the outer surface of the other unit disc is the floating oil adsorption surface b, and the outer surface of the cylindrical panel is the floating oil adsorption surface c.

[0023] The above technical features can collect floating oil on multiple surfaces, and the floating oil adsorption disc is composed of two unit discs and a cylindrical panel, with high strength and no deformation at high temperatures.

[0024] Since the contact area between the end face oil scraping plate and the floating oil adsorption surface a or the floating oil adsorption surface b is large and there is friction during oil scraping, the heat generated by the combination in a high-temperature environment will cause the floating oil adsorption disc to deform or have low adsorption efficiency. Therefore, in one embodiment, a cooling spray pipe for the disc surface is provided below the end face oil scraping plate of the floating oil adsorption disc. The cooling liquid is sprayed onto the disc surface of the floating oil adsorption disc through the spray pipe, so as to achieve the purpose of cooling and avoid deformation of the disc surface at too high a temperature or reduction of the floating oil adsorption property.

[0025] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An oil removal device for high - oil - content and high - temperature wastewater in oil refining and chemical industry, comprising an oil removal tank and an oil removal machine, characterized in that: The oil removal machine is installed on the upper part of the oil removal tank, and the oil removal machine includes a main shaft (3) on which a plurality of floating oil adsorption discs (5) are arranged at intervals. The floating oil adsorption discs (5) are partially immersed in the floating oil in the oil removal tank, and a floating oil adsorption disc flow channel (6) is formed between adjacent floating oil adsorption discs (5). The cylindrical surface and the disc surface of the floating oil adsorption disc (5) form a two-way floating oil adsorption surface; a main shaft driver (4) connected to the main shaft (3) for driving the main shaft to rotate; a floating oil guiding impeller mechanism (7) installed upstream of the main shaft for driving the discontinuous-phase floating oil to flow towards the floating oil adsorption disc flow channel (6); an oil scraping mechanism (8) cooperating with the floating oil adsorption disc for scraping off the oil substances adsorbed on the two-way floating oil adsorption surface; an oil collecting tank (11) connected to the oil outlet side of the oil scraping mechanism (8).

2. The oil removal device for high oil-content and high-temperature wastewater in oil refining according to claim 1, characterized in that: The oil removal machine is arranged at the rear of the oil removal tank. The floating oil guiding impeller mechanism (7) includes a rotating shaft on which several floating oil guiding impellers are installed. The rotating shaft is connected with a rotating shaft driver, and the floating oil guiding impellers rotate in the opposite direction to the floating oil adsorption disc.

3. The oil removal device for high oil content and high temperature wastewater in oil refining according to claim 1, characterized in that: The oil adsorption disc (5) is composed of a floating oil adsorption surface a, a floating oil adsorption surface b, and a floating oil adsorption surface c to form a two-way floating oil adsorption surface on the cylindrical surface and the disc surface. Among them, the floating oil adsorption surface a and the floating oil adsorption surface b are the end faces on both sides respectively, and the floating oil adsorption surface c is the cylindrical surface.

4. The oil removal device for high oil content and high temperature wastewater in oil refining according to claim 2, characterized in that: The oil scraping mechanism (8) includes a cylindrical surface oil scraping plate (9) cooperating with the floating oil adsorption surface c and an end face oil scraping plate (10) cooperating with the floating oil adsorption surfaces a and b; the cylindrical surface oil scraping plate (9) is fixed above the end face oil scraping plate (10), and the end face oil scraping plate (10) has an oil guiding groove communicating with the oil collecting tank (11).

5. The oil removal device for high oil content and high temperature wastewater in oil refining according to claim 4, characterized in that: The oil guiding groove is a V-shaped groove.

6. The oil removal device for high oil-content and high-temperature wastewater in oil refining according to claim 4, wherein: The cylindrical surface oil scraping plate (9) is inclined and fixed, and the oil outlet sides of the cylindrical surface oil scraping plate and the end face oil scraping plate converge and are connected to the oil collecting tank (11).

7. The oil removal device for high oil content and high temperature wastewater in oil refining according to claim 4, characterized in that: The floating oil adsorption disc (5) includes two unit discs arranged in parallel and a cylindrical panel wound around the two unit discs to make the floating oil adsorption disc (5) cylindrical. The outer surface of one unit disc is the floating oil adsorption surface a, the outer surface of the other unit disc is the floating oil adsorption surface b, and the outer surface of the cylindrical panel is the floating oil adsorption surface c.

8. The oil removal device for high oil content and high temperature wastewater in petroleum refining according to claim 4, characterized in that: A disc surface cooling spray pipe is arranged below the end face oil scraping plate of the floating oil adsorption disc.

9. The oil removal device for high oil content and high temperature wastewater in oil refining according to claim 2, characterized in that: An inlet is arranged on one side of the oil removal tank away from the oil removal machine, and a flow guiding plate fixed to the storage tank is arranged on the water outlet side of the inlet. The inlet of the water outlet of the oil removal tank is arranged at the middle position with a high liquid level in the oil removal tank, and a sludge discharge hopper is arranged at the lower part of the oil removal tank.

10. An oil removal device for high oil content and high temperature wastewater in petroleum refining according to any one of claims 1-9, characterized in that: The material of the floating oil adsorption disc is oil-loving and hydrophobic stainless steel material, and the thickness is not less than 0.5 mm.

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