Oil-water separator

Abstract

This utility model belongs to the technical field of oil-water separation devices. The oil-water separation cylinder is characterized by comprising: a cylinder assembly, including an outer cylinder and an inner cylinder coaxially arranged; a wastewater inlet pipe is provided on the inner cylinder, and the outlet of the wastewater inlet pipe is located at the bottom of the inner cylinder; a baffle assembly, circumferentially distributed between the outer cylinder and the inner cylinder, the baffle assembly dividing the space between the outer cylinder and the inner cylinder into an oil separation zone, a water stabilization zone, a water collection tank, and an oil collection tank arranged in a counterclockwise sequence; the oil separation zone is connected to the top of the inner cylinder; the oil separation zone is connected to the bottom of the water stabilization zone; the water stabilization zone is connected to the top of the water collection tank for overflow; and an oil collection pipe is provided on the oil collection tank for collecting the oil layer collected in the upper part of the oil separation zone. This utility model solves the technical problem that existing rectangular oil-water separation boxes are long, require large investments, and are unsuitable for small-scale oil processing plants.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil-water separation devices, and specifically relates to an oil-water separation cylinder. Background Technology

[0002] With the development of the social economy and the improvement of people's living standards, China's vegetable oil industry has grown at an average annual rate of 5% to 6%, making my country a major global producer and consumer of oils. To meet the ever-increasing demand for oils, many large-scale vegetable oil production plants have been built in China. However, this has also brought about environmental pollution problems. The refining workshop's production process system generates a large amount of oily wastewater, accounting for approximately 60% to 70% of the total wastewater from the project. This wastewater contains a high concentration of oils.

[0003] Currently, many oil refineries send this wastewater to sewage treatment plants for purification and discharge after simple settling and separation. This method has a simple process, but the oil removal effect is poor.

[0004] Oil and grease factories use oil-water separators to separate and recycle oil from wastewater, improving economic efficiency. These separators employ a rectangular container of a certain volume. During wastewater flow, the density difference between oil and water causes oil droplets to rise from suspension and accumulate on the surface. Once a certain thickness of oil has accumulated, it is collected and stored through an oil collection port. However, these oil-water separators have the following technical problems: the wastewater flows relatively short within the container, resulting in a short residence time, which prevents tiny oil droplets from reaching the surface. For small-scale oil and grease factories, this type of rectangular separator requires a relatively long length to ensure sufficient wastewater residence time, leading to a larger investment and less economical use. Utility Model Content

[0005] The purpose of this invention is to provide an oil-water separator to solve the technical problems of existing rectangular oil-water separators being too long, requiring large investments, and unsuitable for small-scale oil and grease factories.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: an oil-water separator, characterized in that it includes: The cylindrical assembly includes an outer cylindrical body and an inner cylindrical body arranged coaxially; a wastewater inlet pipe is provided on the inner cylindrical body, and the outlet of the wastewater inlet pipe is located at the bottom of the inner cylindrical body; A baffle assembly is circumferentially distributed between the outer cylinder and the inner cylinder, dividing the space between the outer cylinder and the inner cylinder into an oil-separating zone, a water-stabilizing zone, a water-collecting trough, and an oil-collecting trough arranged in a counterclockwise order. The oil-separating zone is connected to the top of the inner cylinder; the oil-separating zone is connected to the bottom of the water-stabilizing zone; the water-stabilizing zone is connected to the top of the water-collecting trough for overflow; and an oil-collecting pipe is provided on the oil-collecting trough for collecting the oil layer collected in the upper part of the oil-separating zone. In this invention, wastewater is transported to the bottom of the inner cylinder via a wastewater inlet pipe, then rises to the top of the inner cylinder and flows out to the oil separation zone. Afterward, it flows through the annular flow channel of the annular oil separation zone, then enters the water stabilization zone at the bottom, and finally overflows from the top of the water stabilization zone to the collection tank. This extended wastewater flow path improves the efficiency of oil droplet and water separation in the wastewater, making it suitable for oil-water separation in small-scale oil and fat processing plants. This invention employs a cylindrical assembly plus a partition assembly structure, which occupies a small area, requires less investment, and produces wastewater with low oil content, resulting in high oil recovery efficiency, allowing for the recovery of more oil, reducing the pressure on subsequent wastewater treatment, increasing the economic benefits of oil plants, and demonstrating a significant return on investment. It is suitable for small-tonnage oil processing projects.

[0007] To solve the technical problem of how to realize the inner cylinder, the present invention adopts the following technical solution: a top water-blocking ring plate is provided on the inner cylinder; The top of the inner cylinder extends beyond the top water-blocking ring plate to form an extension, and a notch is provided on the extension to guide wastewater from the inner cylinder to the oil separation zone; A bottom plate is horizontally arranged on the inner cylinder, and a first drain outlet is provided on the bottom plate of the inner cylinder.

[0008] To further improve the oil-water separation effect, this utility model adopts the following technical solution: the cross-sectional area of ​​the oil separation zone is larger than the area of ​​the water stabilization zone, the water collection tank, and the oil collection tank. A water inlet pipe is axially installed in the oil separation zone.

[0009] This invention increases the lateral area of ​​the oil separation zone and extends the wastewater flow path. The wastewater flows along the circumference of the cylinder, which relatively increases the distance the wastewater travels and the time for oil droplets to float and accumulate, thus improving the separation efficiency.

[0010] Before the equipment is put into operation, a certain level of water is injected through the inlet pipe. When the equipment is running, it can quickly enter a stable working state and the oil droplets in the wastewater are quickly separated.

[0011] To solve the technical problem of draining liquid from the water stabilization zone or the oil separation zone, the present invention adopts the following technical solution: a second drain port is provided at the bottom of the water stabilization zone or the oil separation zone.

[0012] To solve the technical problem of draining liquid from the water collection tank, the present invention adopts the following technical solution: a third drain outlet is provided at the bottom of the water collection tank.

[0013] To solve the technical problem of drainage in the water collection tank, the present invention adopts the following technical solution: a drain outlet is provided on the water collection tank, and the drain outlet is located above the third drain outlet.

[0014] To solve the technical problem of oil drainage from the oil collection tank, the present invention adopts the following technical solution: an oil drain port is provided at the bottom of the oil collection tank.

[0015] To solve the technical problem of measuring the liquid level in the oil collection tank, this utility model adopts the following technical solution: a liquid level gauge interface is provided on the oil collection tank.

[0016] To address the technical problem of liquid retention within the inner and outer cylinders, this invention employs the following technical solution: the bottom plate of the outer cylinder, where the oil-separating zone, water-stabilizing zone, water-collecting trough, and oil-collecting trough are located, has an inner-high, outer-low structure. This allows liquid to be collected at the lowest point, facilitating the discharge of retained liquid from the outer cylinder through the drain port. Furthermore, compared to a flat plate, the inner-high, outer-low conical plate structure can withstand greater pressure for the same thickness.

[0017] To solve the technical problem of odor inside the cylinder, this utility model adopts the following technical solution: a top cover is provided on the oil-water separator cylinder; The top cover is equipped with an exhaust port, through which the oil and gas inside the cylinder are discharged, keeping the working area clean and odor-free. To address the technical problem of observing the oil-water separation effect, this invention adopts the following technical solution: an observation port is provided on the top cover. This invention provides two observation ports on the top cover to facilitate observation of the oil-water separation effect and to allow for maintenance of the cylinder interior. Attached Figure Description

[0018] Figure 1 This is a top view of the oil-water separator of this utility model; Figure 2 yes Figure 1 A cross-sectional view along the AA direction; Figure 3 yes Figure 2 A cross-sectional view along the BB direction in the middle; Figure 4 This is a schematic diagram of the inner cylinder of this utility model; Figure 5 This is a top view of the inner cylinder of this utility model; Figure 6 This is a partition diagram of the oil-water separator of this utility model; Figure 7 This is a diagram showing the wastewater flow direction of the oil-water separator of this utility model. In the picture: 10. Oil-water separator; 100 Outer cylinder; 101 Mounting ring plate; 102 Lifting lug; 103 Outer cylinder bottom plate; 110 Top cover; 111 Exhaust port; 120 Observation port; 200 Inner cylinder; 210 Top water-retaining ring plate; 220 Extension; 230 Notch; 240 Inner cylinder bottom plate; 250 First row clear opening; 300-point oil zone; 400 stable water zone; 410 second row clean outlet; 500 water collection tank; 510 third row clear outlet; 520 drain outlet; 600 oil collection tank; 610 oil collection pipe; 620 oil drain port; 630 level gauge interface; 701 Partition 1; 702 Partition 2; 703 Partition 3; 704 Partition 4; 800 water inlet pipe; 900 wastewater enters the pipe. Detailed Implementation

[0019] The present invention will be further described below with reference to the figures.

[0020] Oily wastewater discharged from the oil refining section is separated from water by utilizing the principle that oil and water have different densities and are immiscible. The separated oil is recycled and reused, while the wastewater is discharged into the sewage pipe network for purification treatment.

[0021] like Figure 1-3 As shown, the oil-water separator 10 includes a cylinder assembly and a baffle assembly.

[0022] The cylindrical assembly includes an outer cylindrical body 100 and an inner cylindrical body 200. The outer cylindrical body 100 and the inner cylindrical body 200 are coaxially arranged.

[0023] Mounting ring plates 101 are installed at the top and bottom of the outer cylinder 100. Lifting lugs 102 are provided on the outer cylinder 100. A top cover 110 is provided on the cylinder 100. An exhaust port 111 is provided on the top cover 110. The position of the exhaust port 111 on the top cover 110 is not limited. This invention provides an exhaust port on the top cover, through which the upper oil and gas inside the cylinder are discharged, keeping the working area clean and odorless.

[0024] A wastewater inlet pipe 900 is provided on the inner cylinder 200, and the outlet of the wastewater inlet pipe 900 is located at the bottom of the inner cylinder 200. Preferably, the wastewater inlet pipe 900 is coaxially arranged with the inner cylinder 200.

[0025] In one embodiment, such as Figure 4 , Figure 5 As shown, a top water-blocking ring plate 210 is provided on the inner cylinder 200. The top of the inner cylinder 200 extends out of the top water-blocking ring plate to form an extension 220, and a notch 230 is provided on the extension.

[0026] Wastewater flows from the inner cylinder 200 to the bottom, where it is blocked by the bottom plate and flows upwards. It then encounters the top baffle ring 210, from which the water flows out through the gap between the top baffle ring 210 and the inner cylinder 200, flowing to the top notch 230 of the inner cylinder 200 and entering the oil separation zone 300. The size of the top notch 230 of the inner cylinder is an angle ψ, and its height is h.

[0027] An inner cylinder bottom plate 240 is provided on the inner cylinder body 200. Preferably, the inner cylinder bottom plate 240 is horizontally arranged. A first row of clear openings 250 is provided on the inner cylinder bottom plate 240.

[0028] In order to keep the upper water body stable and allow the oil layer to move slowly, the wastewater inlet pipe 900 is inserted into the bottom of the inner cylinder 200. When the wastewater encounters the inner cylinder bottom plate 240, it flows upward in the opposite direction and flows to the oil separation zone 300 through the gap 230. The baffle assembly is circumferentially distributed between the outer cylinder 100 and the inner cylinder 200. The baffle assembly includes four baffles: baffle one 701, baffle two 702, baffle three 703, and baffle four 704. Preferably, the four baffles are arranged radially along the outer cylinder. The four baffles divide the space between the inner and outer cylinders into an oil separation zone 300, a water stabilization zone 400, a water collection tank 500, and an oil collection tank 600 arranged in a counter-clockwise order. Baffle one 701 separates the oil separation zone 300 from the water stabilization zone 400, and a distance is left between the bottom of baffle one 701 and the bottom plate 103 of the outer cylinder for wastewater passage. Baffle two 702 separates the water stabilization zone 400 from the water collection tank 500. Baffle three 702 separates the water collection tank 500 from the oil collection tank 600. Baffle four 704 separates the oil collection tank 600 from the oil separation zone 300. The top heights of partition 1 (701), partition 3 (703), and partition 4 (704) are the same and greater than the top height of partition 2 (702).

[0029] In one embodiment, the cross-sectional area of ​​the oil separation zone 300 is larger than the areas of the water stabilization zone 400, the water collection tank 500, and the oil collection tank 600. The oil separation zone 300 is connected to the top of the inner cylinder 200, and wastewater flows from the inner cylinder 200 to the oil separation zone 300 through the notch 230. The oil separation zone 300 is connected to the bottom of the water stabilization zone 400.

[0030] In one embodiment, an axial water inlet pipe 800 is provided on the oil separation zone 300. Before the equipment is put into operation, water of a certain level is pre-injected through the water inlet pipe 800, so that the equipment can quickly enter a stable working state and the oil droplets in the wastewater can be quickly separated.

[0031] The water stabilization zone 400 is located downstream of the oil separation zone 300. In one embodiment, a second drain outlet 410 is provided at the bottom of the water stabilization zone 400 or the oil separation zone 300.

[0032] The water collection tank 500 is located downstream of the water stabilization zone 400. The top of the water stabilization zone 400 is connected to the water collection tank 500 for overflow from the water stabilization zone 400. In one embodiment, a third drain outlet 510 is provided at the bottom of the water collection tank 500.

[0033] In one embodiment, a drain outlet 520 is provided on the water collection tank 500, and the drain outlet 520 is located above the third drain outlet 510.

[0034] An oil collecting pipe 610 is installed on the oil collecting tank 600 to collect the oil layer collected in the upper part of the oil separation zone 300. The initial height of the top of the oil collecting pipe 610 is the same as the top height of the partition plate 702, and the overflow height of the oil collecting port can be adjusted up and down according to the actual wastewater temperature and the thickness of the floating oil layer.

[0035] In one embodiment, an oil drain port 620 is provided at the bottom of the oil collection tank 600. In another embodiment, a level gauge interface 630 is provided on the oil collection tank 600.

[0036] In one embodiment, the outer cylinder bottom plate 103, where the oil separation zone 300, water stabilization zone 400, water collection tank 500, and oil collection tank 600 are located, has an inner high and outer low structure, which can collect liquid at the lowest point, facilitating the discharge of stagnant liquid inside the outer cylinder through the drain port. Furthermore, compared to a flat plate, the inner high and outer low conical plate structure can withstand greater pressure for the same thickness.

[0037] In one embodiment, an observation port 120 is provided on the top cover 110. Preferably, there are two observation ports 120, one located above the oil separation zone 300, the water stabilization zone 400, and the water collection tank 500, and the other located above the oil collection tank 600 and the oil separation zone 300. This invention provides two observation ports on the top cover, facilitating observation of the oil-water separation effect and inspection of the internal components.

[0038] In one embodiment, the top cover 110 is provided with a water inlet port for installing a water inlet pipe 800.

[0039] In one embodiment, a wastewater inlet port is provided on the top cover 110 for installing a wastewater inlet pipe 900.

[0040] This invention divides the annular space formed by the inner cylinder 200 and the outer cylinder 100 into four areas: a water stabilization zone 400, a water collection tank 500, and an oil collection tank 600, using four partitions. Wastewater flows along the circumferential direction of the cylinder assembly in the oil separation zone 300, entering the water stabilization zone 400 through the lower notch of partition 1 701, and overflowing into the water collection tank 500 at the top of partition 2 702. This area is the water collection tank, and the outer cylinder containing the water collection tank has a drain outlet, which is pumped to the downstream section. The oil layer accumulated in the upper part of the oil separation zone 300 flows to the oil collection tank 600 through the oil collection port. This area is the oil collection tank, and the outer cylinder containing the oil collection tank has an oil discharge port, which is pumped to the downstream section for use.

[0041] like Figure 6 , Figure 7As shown, in the oil refining workshop, crude oil undergoes degumming, alkali refining, and other processes, producing oil residue and soapberry clumps, which are separated by centrifuges according to their different densities. The centrifuge rinsing process generates a large amount of oily wastewater, which is piped to the inlet of the water distribution tank. Other equipment in the refining workshop also discharges oily wastewater, which can be connected to the inlet of the water distribution tank via a main collection pipe. The wastewater is discharged from the bottom through the wastewater inlet pipe 900 and enters the inner cylinder 200. In this area, the wastewater flows upwards, reaching the upper gap 230 and flowing to the oil separation zone 300, where it flows along the inner circumference of the outer cylinder 100, achieving oil-water separation. The wastewater reaches the baffle 701 and flows from the bottom to the water stabilization zone 400, where the water level rises to a certain height, forming a liquid seal. The baffle isolates the collected oil layer and water. Wastewater overflows from the top of partition 702 to collection tank 500 for storage, and is discharged through the drain outlet of collection tank. The oil layer collected in the upper part of oil separation zone 300 flows through oil collection port to oil collection tank 600 for storage and discharge. This invention uses a circular cylindrical assembly for oil-water separation. The inner cylinder 200 is located at the center of the outer cylinder 100. Wastewater flows along the circumference of the cylindrical assembly, which relatively increases the distance the wastewater travels and increases the time for oil droplets to float and accumulate, thus improving the separation efficiency.

[0042] Because oil droplets and water are immiscible, under the influence of buoyancy, the oil droplets float upwards and collect on the upper surface of the wastewater. In the inner cylinder 200, the oil droplets and water flow in the same upward direction, accelerating the upward movement of the oil droplets. After entering the oil separation zone 300, the oil droplets in the lower wastewater flow along the circumference and float upwards to accumulate. The upward movement of the oil droplets requires a certain amount of time and a slow flow to prevent turbulent mixing and incomplete separation of the oil droplets and water. This novel oil-water separator increases the distance the wastewater travels along the circumference and increases the residence time of the wastewater within the tank, thereby improving the oil droplet separation efficiency in the wastewater.

[0043] The above embodiments are only for illustrating the technical features and concept of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made according to the spirit and implementation of this utility model should be covered within the protection scope of this utility model.

Claims

1. An oil-water separator, characterized in that, include: The cylindrical assembly includes an outer cylindrical body and an inner cylindrical body arranged coaxially; Wastewater inlet pipe is provided on the inner cylinder, and the outlet of the wastewater inlet pipe is located at the bottom of the inner cylinder; A baffle assembly is circumferentially distributed between the outer cylinder and the inner cylinder, dividing the space between the outer cylinder and the inner cylinder into an oil-separating zone, a water-stabilizing zone, a water-collecting trough, and an oil-collecting trough arranged in a counterclockwise order. The oil-separating zone is connected to the top of the inner cylinder; the oil-separating zone is connected to the bottom of the water-stabilizing zone; the water-stabilizing zone is connected to the top of the water-collecting trough for overflow; and an oil-collecting pipe is provided on the oil-collecting trough for collecting the oil layer collected in the upper part of the oil-separating zone.

2. The oil-water separator according to claim 1, characterized in that, A top water-bearing ring plate is provided on the inner cylinder; The top of the inner cylinder extends beyond the top water-blocking ring plate to form an extension, and a notch is provided on the extension to guide wastewater from the inner cylinder to the oil separation zone; A bottom plate is horizontally arranged on the inner cylinder, and a first drain outlet is provided on the bottom plate of the inner cylinder.

3. The oil-water separator according to claim 1, characterized in that, The cross-sectional area of ​​the oil separation zone is larger than the area of ​​the water stabilization zone, the water collection tank, and the oil collection tank; A water inlet pipe is axially installed in the oil separation zone.

4. The oil-water separator according to claim 1, characterized in that, A second drain outlet is provided at the bottom of the oil separation zone or water stabilization zone.

5. The oil-water separator according to claim 1, characterized in that, A third row of clean openings is provided at the bottom of the water collection tank.

6. The oil-water separator according to claim 5, characterized in that, A drain outlet is provided on the water collection tank, and the drain outlet is located above the third drain outlet.

7. The oil-water separator according to claim 1, characterized in that, An oil drain port is provided at the bottom of the oil collection tank; A level gauge interface is provided on the oil collection tank.

8. The oil-water separator according to claim 1, characterized in that, The bottom plate of the cylinder containing the oil separation zone, the water stabilization zone, the water collection tank, and the oil collection tank has an inner high and outer low structure.

9. The oil-water separator according to claim 1, characterized in that, The oil-water separator is equipped with a top cover; An exhaust port is provided on the top cover.

10. The oil-water separator according to claim 9, characterized in that, An observation port is provided on the top cover.

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