Oil-water separation equipment for coal chemical industry

Abstract

The utility model relates to oil-water separation equipment for the coal chemical industry, and relates to the field of oil-water separation. One end of the horizontal separation tank is fixedly communicated with a liquid inlet pipe, the other end of the horizontal separation tank is fixedly communicated with a liquid outlet pipe, and a buffer chamber, a primary coalescence chamber, a refined coalescence chamber and a secondary coalescence chamber are sequentially arranged in the horizontal separation tank in the direction from liquid inlet to liquid outlet; the first-stage coalescence system is positioned in the first-stage coalescence chamber and is used for primarily separating an oil-water mixture; the fine coalescence system is positioned in the fine coalescence chamber and is used for performing fine separation on the oil-water mixture; the second-stage coalescence system is positioned in the second-stage coalescence chamber and is used for carrying out secondary separation on the oil-water mixture; the top of the horizontal separation tank is communicated with a light oil tank, and the bottom is communicated with a heavy oil tank. By means of the three-stage coalescence system, efficient separation of an oil-water mixture can be achieved, and a good separation effect is achieved.

Description

Technical Field

[0001] The present application relates to the field of oil-water separation, and in particular to an oil-water separation device for coal chemical industry. Background Art

[0002] The coal chemical industry refers to the industry that uses coal as raw material and converts coal into gas, liquid and solid fuels and chemical products through chemical processing methods. Coal chemical product production, downstream applications and other links. In addition, the integration of coal chemical industry with petrochemical industry, natural gas chemical industry and other fields is also deepening. In the coal chemical production process, ash produces a large amount of oil-water mixture, which needs to be separated into oil and water phases. Due to the characteristics of coal chemical industry, the density of the oil produced in the production process is very close to that of water. The maximum density of light oil can reach 0.98g / cm3, and the minimum density of heavy oil can reach 1.02g / cm3. Therefore, it is very difficult to separate the oil and water phases. In the actual production process, light oil with a lower density than water and heavy oil with a higher density than water often exist at the same time, making it difficult for current separation technology to separate them efficiently.

[0003] At present, the commonly used oil-water separation technologies include gravity sedimentation and chemical agent methods, but both methods have defects to varying degrees. Gravity sedimentation is mainly achieved using sedimentation tanks or sedimentation tanks. This technology is suitable for working conditions where the oil-water separation efficiency is not high. The main disadvantages are large floor space, low separation efficiency, and inability to effectively separate severely emulsified oil-water mixtures. The chemical agent method mainly achieves the purpose of accelerating oil-water separation by adding chemical agents such as demulsifiers, but its agent consumption is large and the operating cost is high. At the same time, the added chemical agents may have adverse effects on the production process or the final product.

[0004] In view of the above-mentioned related technologies, the inventors believe that it is urgent to provide an oil-water separation device with good separation effect and high efficiency to solve the defects existing in the separation process of the oil-water mixture in the related technologies. Summary of the invention

[0005] In order to improve the separation efficiency and separation effect of oil-water mixture, the present application provides an oil-water separation device for coal chemical industry.

[0006] The oil-water separation equipment for coal chemical industry provided in this application adopts the following technical solution:

[0007] An oil-water separation device for coal chemical industry, comprising:

[0008] A horizontal separation tank, one end of which is fixedly connected with a liquid inlet pipe and the other end of which is fixedly connected with a liquid outlet pipe. The interior of the horizontal separation tank is sequentially arranged along the direction from the liquid inlet to the liquid outlet, including a buffer chamber, a primary coalescing chamber, a refined coalescing chamber and a secondary coalescing chamber. A flow stabilizing plate is arranged at the bottom of the buffer chamber. The flow stabilizing plate is arranged horizontally and fixedly connected to the inner wall of the horizontal separation tank. A plurality of flow stabilizing holes evenly distributed at intervals are opened on the flow stabilizing plate. One end of the liquid inlet pipe extends into the buffer chamber and is vertically bent. The bent end of the liquid inlet pipe passes through the flow stabilizing plate and extends to the bottom of the flow stabilizing plate.

[0009] The primary coalescing system, located in the primary coalescing chamber, is used for preliminary separation of the oil-water mixture;

[0010] A fine coalescence system, located in the fine coalescence chamber, is used for fine separation of the oil-water mixture;

[0011] A secondary coalescing system, located in the secondary coalescing chamber, is used for secondary separation of the oil-water mixture;

[0012] The top of the horizontal separation tank is connected to a light oil tank, and the bottom is connected to a heavy oil tank.

[0013] Optionally, the first-level coalescing system includes a first-level water distribution plate and a first-level coalescing plate. The first-level water distribution plate is vertically arranged at the left end of the first-level coalescing chamber. The first-level water distribution plate is fixedly connected to the inner wall of the horizontal separation tank. The first-level water distribution plate is provided with a plurality of water distribution holes evenly spaced along the thickness direction. The first-level coalescing plates are provided with multiple first-level coalescing plates, which overlap with each other and are horizontally arranged. A gap is left between two adjacent first-level coalescing plates for liquid circulation, and the gap thickness is 5-20mm.

[0014] Optionally, the primary coalescing plate is a polypropylene plate with a wavy surface, the wave extension direction of the surface of the primary coalescing plate is perpendicular to the liquid flow direction, and the primary coalescing plate is provided with a plurality of evenly distributed diffusion holes at the wave crests and wave troughs.

[0015] Optionally, the secondary coalescing system includes a secondary water distribution plate and a secondary coalescing plate. The structure and installation method of the secondary water distribution plate and the secondary coalescing plate are the same as those of the primary coalescing system, except that the spacing between the secondary coalescing plates is 1 / 2 of the spacing between the primary coalescing plates.

[0016] Optionally, the refined coalescence system includes a mounting plate and a plurality of coalescence filter elements arranged in parallel, and the coalescence filter elements are fixedly connected to the mounting plate.

[0017] Optionally, the horizontal separation tank is provided with an upper cleaning port and a lower cleaning port at the primary coalescing chamber and the secondary coalescing chamber, and valves are fixedly connected to the upper cleaning port and the lower cleaning port.

[0018] Optionally, the horizontal separation tank is connected to a nitrogen inlet at the bottom of the primary coalescing chamber and the bottom of the secondary coalescing chamber.

[0019] In summary, the present application includes at least one of the following beneficial technical effects:

[0020] 1. The equipment of the present application realizes efficient separation of oil-water mixture by combining the primary coalescence system, the refined coalescence system and the secondary coalescence system. In particular, the refined coalescence system effectively treats the emulsified oil in the water and improves the separation efficiency through the design of the coalescence filter element. The primary coalescence plate and the secondary coalescence plate adopt a wavy design and diffusion holes, which can capture and coalesce oil droplets to form larger oil droplets. According to the Stokes formula, the oil droplets are easier to separate after the volume increases, thereby improving the separation efficiency. Through the three-stage coalescence system, the oil-water mixture can be efficiently separated and has a good separation effect.

[0021] 2. Compared with the traditional chemical method, this device does not need to add a large amount of chemical agents, which reduces the agent consumption and operating costs, and avoids the adverse effects of chemical agents on the production process or the final product. The equipment adopts a physical separation method to reduce environmental pollution and conform to the green and environmentally friendly production concept.

[0022] 3. The interior of the horizontal separation tank is divided into multiple functional chambers, including a buffer chamber, a primary coalescing chamber, a refined coalescing chamber and a secondary coalescing chamber, making the oil-water separation process more orderly and efficient. The design of the flow stabilizer effectively reduces the fluctuation of the oil-water mixture and improves the separation effect. At the same time, the setting of the drain port and the cleaning port facilitates the inspection and maintenance of the equipment. The setting of the nitrogen inlet can be used for nitrogen purging when necessary to help discharge the residual oil-water mixture. The nitrogen turbulence cleaning effect is used to clean the impurities and dirty oil remaining on the surface of the coalescing plate and the coalescing filter element, further improving the cleanliness and separation efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of an oil-water separation device for coal chemical industry according to an embodiment of the present application.

[0024] Explanation of the reference numerals: 1. Horizontal separation tank; 11. Liquid inlet pipe; 12. Liquid outlet pipe; 13. Buffer chamber; 131. Flow stabilizing plate; 132. Drain port; 14. Primary coalescing chamber; 141. Nitrogen inlet; 15. Secondary coalescing chamber; 16. Light oil tank; 17. Heavy oil tank; 18. Upper cleaning port; 19. Lower cleaning port; 2. Primary coalescing system; 21. Primary water distribution plate; 22. Primary coalescing plate; 3. Refining coalescing system; 31. Mounting plate; 32. Coalescing filter element; 4. Secondary coalescing system; 41. Secondary water distribution plate; 42. Secondary coalescing plate. DETAILED DESCRIPTION

[0025] The present application is further described in detail below in conjunction with the accompanying drawings.

[0026] The present application embodiment discloses an oil-water separation device for coal chemical industry. Figure 1 An oil-water separation device for coal chemical industry includes a horizontal separation tank 1, a primary coalescence system 2, a fine coalescence system 3 and a secondary coalescence system 4.

[0027] Reference Figure 1 , a horizontal separation tank 1 is fixedly connected with a liquid inlet pipe 11 at one end and a liquid outlet pipe 12 at the other end. The interior of the horizontal separation tank 1 is sequentially arranged with a buffer chamber 13, a primary coalescing chamber 14, a fine coalescing chamber and a secondary coalescing chamber 15 along the direction from the liquid inlet to the liquid outlet. The primary coalescing system 2 is located in the primary coalescing chamber 14 and is used for preliminary separation of the oil-water mixture. The fine coalescing system 3 is located in the fine coalescing chamber and is used for fine separation of the oil-water mixture. The secondary coalescing system 4 is located in the secondary coalescing chamber 15 and is used for secondary separation of the oil-water mixture. The horizontal separation tank 1 is fixedly connected with a light oil tank 16 and a heavy oil tank 17 on the primary coalescing chamber 14 and the secondary coalescing chamber 15. The light oil tank 16 is located at the top of the horizontal separation tank 1, and the heavy oil tank 17 is located at the bottom of the horizontal separation tank 1.

[0028] Reference Figure 1 The horizontal separation tank 1 is provided with a flow stabilizer 131 at the bottom of the buffer chamber 13. The flow stabilizer 131 is horizontally arranged and fixedly connected to the inner wall of the horizontal separation tank 1. A plurality of flow stabilizer holes evenly spaced are provided on the flow stabilizer 131. One end of the liquid inlet pipe 11 extends into the buffer chamber 13 and is vertically bent. The bent end of the liquid inlet pipe 11 passes through the flow stabilizer 131 and extends to the bottom of the flow stabilizer 131. The flow stabilizer 131 can reduce the fluctuation of the oil-water mixture in the buffer chamber 13 and eliminate the inlet turbulence. The horizontal separation tank 1 is also connected with a drain port 132 at the bottom of the buffer chamber 13. The drain port 132 is provided to facilitate draining the oil-water mixture in the buffer chamber 13 during maintenance.

[0029] Reference Figure 1The primary coalescing system 2 includes a primary water distribution plate 21 and a primary coalescing plate 22. The primary water distribution plate 21 is vertically arranged at the left end of the primary coalescing chamber 14. The primary water distribution plate 21 is fixedly connected to the inner wall of the horizontal separation tank 1. The primary water distribution plate 21 is provided with a plurality of water distribution holes evenly spaced in the thickness direction. The primary coalescing plate 22 is located on the right side of the primary water distribution plate 21. There are multiple primary coalescing plates 22. Multiple primary coalescing plates 22 overlap each other and are arranged horizontally. A gap is left between two primary coalescing plates 22 for liquid circulation. The thickness of the gap is 10 mm. The primary coalescing plate 22 is a polypropylene plate with a wavy surface. The wave extension direction of the surface of the primary coalescing plate 22 is perpendicular to the liquid circulation direction in the horizontal separation tank 1. The primary coalescing plate 22 is provided with a plurality of evenly distributed diffusion holes at the wave crests and wave troughs. The aperture of the diffusion hole is 15 mm. The primary coalescing plate 22 is in a corrugated state as a whole, and holes are opened at the crests and troughs to facilitate the light oil to float up and the heavy oil to float down. The primary coalescing plate 22 can capture and coalesce small oil droplets in the oil-water mixed medium to form larger oil droplets. According to the Stokes equation, as the volume of the oil droplets increases, the light oil is more likely to float up and the heavy oil is more likely to sink. The oil-water mixture can be separated efficiently, and the heavy oil is discharged from the bottom of the equipment into the heavy oil tank 17, and the light oil is discharged from the top of the equipment into the light oil tank 16.

[0030] Reference Figure 1 The fine coalescence system 3 includes a mounting plate 31 and a plurality of coalescence filter cartridges 32 arranged in parallel, and the coalescence filter cartridges 32 and the mounting plate 31 are fixedly connected. The filter holes of the coalescence filter cartridge 32 have the same aperture, and the plurality of filter holes are evenly distributed along the cross section of the coalescence filter cartridge 32. During the coalescence process, the tiny dispersed droplets at the inlet gradually aggregate into larger droplet dispersed phases. Through the fine treatment of the coalescence filter cartridge 32, the emulsified oil in the water begins to demulsify through the coalescence effect of the coalescence filter cartridge 32, and forms larger oil droplets again. The water phase containing the larger oil droplets enters the secondary coalescence system 4 for separation again.

[0031] Reference Figure 1The secondary coalescing system 4 includes a secondary water distribution plate 41 and a secondary coalescing plate 42. The secondary water distribution plate 41 is vertically arranged at the left end of the secondary coalescing chamber 15. The secondary water distribution plate 41 is fixedly connected to the inner wall of the horizontal separation tank 1. The secondary water distribution plate 41 is provided with a plurality of water distribution holes evenly spaced in the thickness direction. The secondary coalescing plate 42 is located on the right side of the secondary water distribution plate 41. There are a plurality of secondary coalescing plates 42. The plurality of secondary coalescing plates 42 overlap each other and are arranged horizontally. A gap is left between the two secondary coalescing plates 42 for liquid circulation. The thickness of the gap is 5 mm. The secondary coalescing plate 42 is a polypropylene plate with a wavy surface. The wave extension direction of the surface of the secondary coalescing plate 42 is perpendicular to the liquid circulation direction in the horizontal separation tank 1. The secondary coalescing plate 42 is provided with a plurality of evenly distributed diffusion holes at the wave crest and the wave trough. The aperture of the diffusion hole is 15 mm. The water phase containing larger oil droplets enters the secondary coalescing system 4, and water is distributed again, so that the liquid phase can evenly enter the secondary coalescing plate 42, thereby improving the separation efficiency of the secondary coalescing plate 42. The oil droplets in the water phase become larger and easier to separate through coalescing separation of the secondary coalescing plate 42. Reducing the plate spacing of the secondary coalescing plate 42 can reduce the floating distance of the oil droplets, thereby reducing the time it takes for the oil droplets to reach the plate surface.

[0032] Reference Figure 1 The horizontal separation tank 1 is provided with an upper cleaning port 18 and a lower cleaning port 19 at the primary coalescing chamber 14 and the secondary coalescing chamber 15. The horizontal height of the upper cleaning port 18 is higher than the horizontal height of the lower cleaning port 19. Valves are fixedly connected to the upper cleaning port 18 and the lower cleaning port 19.

[0033] Reference Figure 1 The horizontal separation tank 1 is connected to a nitrogen inlet 141 at the bottom of the primary coalescing chamber 14 and the secondary coalescing chamber 15 .

[0034] The implementation principle of the oil-water separation equipment for coal chemical industry in the embodiment of the present application is: mainly based on the difference in the physical properties of the oil-water mixture, especially the difference in density, surface tension and wettability between oil and water, to achieve efficient oil-water separation through a multi-stage coalescence and separation process. The following is a detailed analysis and summary of the working principle of the equipment:

[0035] Pre-filtration and water distribution: The oil-water mixture is first processed by the pre-filter to remove large particles of impurities and provide a relatively clean medium for the subsequent coalescence process. The flow stabilizer 131 eliminates the disturbance of the inlet liquid, so that the oil-water mixture can enter the coalescence system evenly and stably.

[0036] Primary coalescence and separation: Under the action of the primary water distribution plate 21, the oil-water mixed medium enters the primary coalescence plate 22 in a laminar flow manner. The special structure of the primary coalescence plate 22 allows the oil droplets to collide and merge with each other to form larger oil droplets. Most of the dispersed oil is removed, while the water phase containing the emulsified oil continues to flow backward and enter the coalescence filter element 32.

[0037] Fine treatment of coalescing filter element 32: The coalescing filter element 32 uses an inside-out method to finely treat the emulsified oil in the water. The emulsified oil begins to break under the coalescing action of the filter element and forms larger oil droplets again.

[0038] Secondary coalescence and separation: The water phase containing larger oil droplets enters the secondary water distribution plate 41, and water is distributed again to ensure that the liquid phase can evenly enter the secondary coalescence plate 42. Through the action of the secondary coalescence plate 42, the oil droplets in the water phase are further enlarged and easier to separate.

[0039] Oil-water separation and collection: After three-stage coalescence, the dispersed oil and emulsified oil in the water are basically completely separated, and the separation efficiency can reach more than 99.9%. The separated light oil enters the light oil tank 16, and the heavy oil enters the heavy oil tank 17, which is convenient for subsequent collection and utilization.

[0040] The horizontal separation tank 1 is provided with an upper cleaning port 18 and a lower cleaning port 19 at the primary coalescing chamber 14 and the secondary coalescing chamber 15, so as to facilitate the cleaning of the equipment. During cleaning, the upper cleaning port 18 and the lower cleaning port 19 are opened respectively, and then nitrogen can be introduced from the nitrogen inlet 141 to the bottom of the primary coalescing chamber 14 and the secondary coalescing chamber 15 for reverse purge to help discharge the residual oil-water mixture.

[0041] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An oil-water separation device for coal chemical industry, characterized in that: include; A horizontal separation tank (1), wherein one end of the horizontal separation tank (1) is fixedly connected to a liquid inlet pipe (11), and the other end is fixedly connected to a liquid outlet pipe (12); the interior of the horizontal separation tank (1) is sequentially arranged along the direction from the liquid inlet to the liquid outlet, comprising a buffer chamber (13), a primary coalescing chamber (14), a refined coalescing chamber, and a secondary coalescing chamber (15); a flow stabilizing plate (131) is arranged at the bottom of the buffer chamber (13); the flow stabilizing plate (131) is arranged horizontally and fixedly connected to the inner wall of the horizontal separation tank (1); a plurality of flow stabilizing holes evenly distributed at intervals are provided on the flow stabilizing plate (131); one end of the liquid inlet pipe (11) extends into the buffer chamber (13) and is arranged to be bent vertically; the bent end of the liquid inlet pipe (11) passes through the flow stabilizing plate (131) and extends to the bottom of the flow stabilizing plate (131); A primary coalescing system (2), located in the primary coalescing chamber (14), is used to perform preliminary separation of the oil-water mixture; A fine coalescence system (3), located in the fine coalescence chamber, is used to perform fine separation on the oil-water mixture; A secondary coalescing system (4), located in the secondary coalescing chamber (15), is used for performing secondary separation on the oil-water mixture; The top of the horizontal separation tank (1) is connected to a light oil tank (16), and the bottom is connected to a heavy oil tank (17).

2. The oil-water separation equipment for coal chemical industry according to claim 1, characterized in that: The primary coalescing system (2) comprises a primary water distribution plate (21) and a primary coalescing plate (22), wherein the primary water distribution plate (21) is vertically arranged at the left end of the primary coalescing chamber (14), the primary water distribution plate (21) is fixedly connected to the inner wall of the horizontal separation tank (1), the primary water distribution plate (21) is provided with a plurality of water distribution holes evenly spaced apart along the thickness direction, the primary coalescing plates (22) are provided with a plurality of them, the plurality of primary coalescing plates (22) are overlapped and arranged horizontally, a gap for liquid circulation is left between two adjacent primary coalescing plates (22), and the thickness of the gap is 5-20 mm.

3. The oil-water separation equipment for coal chemical industry according to claim 2, characterized in that: The primary coalescing plate (22) is a polypropylene plate with a wavy surface. The wave extension direction of the surface of the primary coalescing plate (22) is perpendicular to the liquid flow direction. The primary coalescing plate (22) is provided with a plurality of evenly distributed diffusion holes at the wave crests and wave troughs.

4. The oil-water separation equipment for coal chemical industry according to claim 3, characterized in that: The secondary coalescing system (4) comprises a secondary water distribution plate (41) and a secondary coalescing plate (42). The structure and installation method of the secondary water distribution plate (41) and the secondary coalescing plate (42) are the same as those of the primary coalescing system (2), except that the spacing between the secondary coalescing plates (42) is 1 / 2 of the spacing between the primary coalescing plates (22).

5. The oil-water separation equipment for coal chemical industry according to claim 1, characterized in that: The refined coalescence system (3) comprises a mounting plate (31) and a plurality of coalescence filter elements (32) arranged in parallel, wherein the coalescence filter elements (32) and the mounting plate (31) are fixedly connected.

6. The oil-water separation equipment for coal chemical industry according to claim 1, characterized in that: The horizontal separation tank (1) is provided with an upper cleaning port (18) and a lower cleaning port (19) at the primary coalescing chamber (14) and the secondary coalescing chamber (15), and valves are fixedly connected to the upper cleaning port (18) and the lower cleaning port (19).

7. The oil-water separation equipment for coal chemical industry according to claim 1, characterized in that: The horizontal separation tank (1) is connected to a nitrogen inlet (141) at the bottom of the primary coalescing chamber (14) and the secondary coalescing chamber (15).

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