Separation device with oil-water selective separation capability

Abstract

The utility model relates to a separation device with oil-water selective separation capability, which is provided with an oil-water separation tank, a material selection separation partition plate with an oil-water intercommunication flow channel is arranged in the oil-water separation tank, and an oily sewage inlet outside the tank body is communicated with two sides of the material selection separation partition plate in the oil-water separation tank; an oleophylic and hydrophobic material and a hydrophilic and oleophobic material are respectively filled into the oil-water separation tank on two sides of the selected material separation partition plate through a charging hole I and a charging hole II; the lower part of the oil-water separation tank on one side filled with the oleophylic and hydrophobic material is connected with an oil product storage tank, and the lower part of the oil-water separation tank on one side filled with the oleophylic and oleophobic material is connected with a liquid recovery tank. The advantages of hydrophilic and oleophobic and oleophylic and hydrophobic selective materials in the aspect of oil-water separation are fully utilized, and the oil-water separation efficiency and purity of the device are improved. The device is simple in structure and reasonable in design, reduces the size and occupied area of separation equipment, protects the environment, reduces the production cost, and has a remarkable use effect.

Description

Technical Field

[0001] The utility model belongs to the field of oilfield resource development, in particular to a separation device with oil-water selective separation capability. Background Art

[0002] Oily wastewater is produced during oilfield exploitation. The wastewater contains oil, suspended matter and other pollutants and needs to be treated by a matching wastewater treatment process.

[0003] At present, many domestic oil fields have entered the high water content or even ultra-high water content development stage. The water content of produced fluids has increased year by year, and the liquid volume has also increased further. Some of the built gathering and transportation stations are close to or overloaded, resulting in a series of problems in the ground processing system of the oil field, such as increased energy consumption, increased costs, and urgent expansion of stations. For the high water content produced fluid of the oil well, pre-dehydration treatment of free water in the high water content crude oil production fluid should be carried out as early as possible at the front end of the oil and gas gathering and transportation process, 30%-70% of the produced water should be removed, and the oil content in the water should be reduced to meet the reinjection requirements, and then on-site reinjection can be realized, which can reduce the burden of the back-end gathering and transportation system, reduce the load, energy consumption and operating cost of the oil and water treatment system, and avoid the expansion and investment of the back-end gathering and transportation stations. It is an important measure to reduce costs and increase efficiency.

[0004] In terms of density classification, oilfield types can be roughly divided into heavy oilfields and light oilfields. In the treatment of produced water from light oilfields, cyclone separation devices are one of the commonly used oil-water separation methods. Since cyclone separation devices have poor separation effects when treating produced water from heavy oilfields, they are not used.

[0005] Common treatment devices for produced water from heavy oil fields are inclined plate deoilers and aerated flotation devices. The disadvantage of both is that the separation effect is positively correlated with the floor area, and the floor area is the main determining factor for the separation effect. Therefore, improving the separation effect of such devices will lead to an increase in their floor area, and when the floor area needs to be controlled, the separation effect is difficult to improve.

[0006] In view of the current treatment status of oily wastewater, it is necessary to improve the separation effect and reduce the size and floor space of the treatment equipment.

[0007] After searching, there are currently the following devices and methods related to oil-water separation:

[0008] Chinese patent publication number CN116284984A discloses a method for preparing a super-hydrophobic MOF oil-water separation sponge, which uses a polyurethane sponge as a substrate, and modifies a layer of shuttle-shaped copper MOF structure on it, thereby greatly increasing the surface roughness of the sponge; then the sponge surface is wrapped with PDMS to obtain a super-hydrophobic MOF sponge that can be used for oil-water separation. The prepared super-hydrophobic MOF oil-water separation sponge can be used to treat oil-water mixtures, and the material has the advantages of fast separation speed, high separation efficiency, strong separation stability, and low separation cost.

[0009] However, the above invention method does not use super-hydrophobic materials and super-hydrophilic materials, which affects the degree and effect of oil-water separation.

[0010] A multi-stage treatment device for oil-water separation disclosed in Chinese patent authorization announcement number CN220201661U includes a primary treatment tank and a secondary treatment tank, a connecting pipe installed on the primary treatment tank and connected to the secondary treatment tank; a pre-treatment filter element assembly is installed in the primary treatment tank; a fine treatment filter element assembly is installed in the secondary treatment tank; a support structure for supporting the pre-treatment filter element assembly is provided inside the primary treatment tank; a guide structure is provided at the end of the liquid inlet pipe; a sleeve is installed inside the secondary treatment tank and is covered on the outside of the fine treatment filter element assembly, and a secondary guide structure is provided on the sleeve. Through the setting of the guide structure and the setting of the secondary guide structure, the oilfield output liquid is guided and guided, and enters in a swirling manner to reduce the impact force generated when contacting the tank body, thereby reducing turbulence and ensuring the oil-water separation efficiency, and centrifugal force is generated during the swirling, thereby further improving the oil-water separation efficiency.

[0011] However, the above-mentioned device has a complex manufacturing process and occupies a large space. It is not suitable for large-scale oil-water separation measures, and its large-scale application is limited, and it does not have oil-water separation selectivity.

[0012] At present, oil-water separation technology has difficulty in achieving efficient and high-purity separation of oil and water, which affects the implementation of efficient water separation and rapid water removal supporting sewage treatment processes, and has potential adverse effects on improving the reinjection utilization of oily sewage and protecting the natural environment.

[0013] Based on the selective materials of hydrophilic and oleophobic as well as the selective materials of oleophilic and hydrophobic, the common use of the two has great development potential in oil-water separation, but how to mix the two and simplify the separation process of oily wastewater has become a difficult problem. The problem of the common and mixed use of hydrophilic and oleophobic selective materials as well as the selective materials of oleophilic and hydrophobic needs to be solved urgently. Summary of the invention

[0014] The purpose of the utility model is to provide a separation device with oil-water selective separation capability, utilizing the advantages of hydrophilic-oleophobic and oleophilic-hydrophobic selective materials in oil-water separation, allowing the two to be used together in the oil-water separation device, reducing the volume and floor space of the separation equipment, improving the oil-water separation effect, effectively utilizing oily wastewater, protecting the environment, and reducing production costs.

[0015] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a separation device with oil-water selective separation capability, provided with an oil-water separation tank, wherein: a material selection separation baffle with an oil-water interconnecting flow channel is arranged in the oil-water separation tank, and the oily wastewater inlet outside the tank body is connected with both sides of the material selection separation baffle in the oil-water separation tank; oleophilic and hydrophobic materials and hydrophilic and oleophobic materials are respectively loaded into the oil-water separation tank on both sides of the material selection separation baffle through feeding port one and feeding port two; the lower part of the oil-water separation tank on the side equipped with the oleophilic and hydrophobic materials is connected to the oil storage tank, and the lower part of the oil-water separation tank on the side equipped with the hydrophilic and oleophobic materials is connected to the liquid recovery tank.

[0016] Preferably, the oleophilic and hydrophobic material is hydrophobic styrene microspheres and hydrophobic materials obtained by chemical modification.

[0017] Preferably, the oleophilic and hydrophobic material is fly ash particles.

[0018] Preferably, the hydrophilic and oleophobic material is natural quartz sand microspheres or particles.

[0019] Preferably, the hydrophilic and oleophobic material is ceramsite.

[0020] Preferably, the oil-water interconnecting flow channels in the material selection separation partition are liquid flow holes or liquid flow grooves densely distributed in the plate body.

[0021] Preferably, the aperture of the liquid flow hole or the width of the liquid flow groove in the oil-water interconnecting flow channel is smaller than the outer diameter of the microspheres or particles made of oleophilic and hydrophobic materials and hydrophilic and oleophobic materials.

[0022] Preferably, the oily wastewater inlet is connected to a wastewater delivery pipeline; a feed port one control valve and a feed port two control valve are respectively installed in the pipeline between the feed port one and the feed port two and the oil-water separation tank below.

[0023] Preferably, a first-level oil outlet valve and a first-level water outlet valve are respectively installed in the pipelines between the first-level oil outlet and the first-level water outlet at the bottom of the oil-water separation tank on both sides of the material selection separation partition and the oil storage tank and the liquid recovery tank.

[0024] Preferably, a secondary oil outlet and a secondary water outlet are provided at the bottom of the oil storage tank and the liquid recovery tank, and the connecting pipelines of the secondary oil outlet and the secondary water outlet are respectively equipped with an oil outlet control valve and a water outlet control valve and are connected to the oil pipeline network and the sewage reinjection pipeline network through the oil outlet control valve and the water outlet control valve.

[0025] Compared with the prior art, the utility model has the following beneficial effects: the utility model is a separation device for oily wastewater using a hydrophilic and oleophobic selective material and an oleophilic and hydrophobic selective material. The utility model can allow the filling part of the material with oil-submerged hydrophobic property after being wetted by the oil phase to allow the oil phase to flow through, and not allow the water phase to flow through. On the contrary, the utility model can also allow the filling part of the material with underwater oleophobic property after being wetted by the water phase to allow the water phase to flow through, and not allow the oil phase to flow through.

[0026] The utility model separates the oleophilic and hydrophobic selective material and the hydrophilic and oleophobic selective material through a material separation partition and packs them separately in an oil-water separation tank, thereby realizing the use of the two together in a set of equipment, greatly giving play to the advantages of the two in oil-water separation.

[0027] Based on the fact that hydrophobic styrene is a selective material including oleophilicity and hydrophobicity, and hydrophilic quartz sand is a selective material including hydrophilicity and oleophobicity, both of them become the oil-water separation materials selected for use in the utility model.

[0028] The utility model respectively adds hydrophilic and oleophobic selective materials and hydrophilic and oleophobic selective materials through a first feeding port and a second feeding port arranged on an oil-water separation tank, arranges a material selection separation partition in the oil-water separation tank and fixes it in the oil-water separation tank between the first feeding port and the second feeding port, separates styrene microspheres and hydrophilic quartz sand microspheres or particles on both sides, and inputs oily sewage through an oily sewage inlet arranged on the tank top and placed in the middle of the material selection separation partition.

[0029] The utility model allows the water phase and the oil that cannot pass through on both sides to communicate with each other through the selected material separation partition, so that the hydrophilic oleophobic and oleophilic hydrophobic selective materials are used together in the oil-water separation device, and fully utilizes the advantages of the hydrophilic oleophobic and oleophilic hydrophobic selective materials in oil-water separation, thereby improving the efficiency and purity of the oil-water separation of the device.

[0030] The utility model has a simple structure and a reasonable design, reduces the volume and floor space of the separation equipment, improves the oil-water separation effect, effectively utilizes the oily sewage, protects the environment, reduces the production cost, and has a remarkable use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0033] Figure 2 for Figure 1 An enlarged schematic diagram of the structure of the oil-water separation tank.

[0034] Figure 3 for Figure 1 An enlarged schematic diagram of the structure of the Sinopec product storage tank.

[0035] Figure 4 for Figure 1 An enlarged schematic diagram of the structure of the liquid recovery tank.

[0036] In the figure: oil-water separation tank 1; material separation partition 2, oil-water interconnecting flow channel 2-1; oily wastewater inlet 3, feeding port 1 4, feeding port 2 5, feeding port 1 control valve 6, feeding port 2 control valve 7, first-level oil outlet valve 8, first-level water outlet valve 9, first-level oil outlet 10, first-level water outlet 11, oil storage tank 12, liquid recovery tank 13, second-level oil outlet 14, second-level water outlet 15. DETAILED DESCRIPTION

[0037] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of the present utility model. The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0038] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0039] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0040] See also Figure 1-Figure 4 , a separation device with oil-water selective separation capability, comprising an oil-water separation tank 1, wherein: a material selection separation baffle 2 with an oil-water interconnecting flow channel 2-1 is arranged in the oil-water separation tank 1, and an oily wastewater inlet 3 outside the tank body is connected with both sides of the material selection separation baffle 2 in the oil-water separation tank 1; oleophilic and hydrophobic materials and hydrophilic and oleophobic materials are respectively loaded into the oil-water separation tank 1 on both sides of the material selection separation baffle 2 through a feeding port 1 4 and a feeding port 2 5; the lower part of the oil-water separation tank 1 on the side equipped with the oleophilic and hydrophobic materials is connected to an oil storage tank 12, and the lower part of the oil-water separation tank 1 on the side equipped with the hydrophilic and oleophobic materials is connected to a liquid recovery tank 13.

[0041] The utility model separates the oleophilic and hydrophobic selective materials and the hydrophilic and oleophobic selective materials through the material selection separation partition 2 and packs them separately in the oil-water separation tank 1. The oil-water intercommunication flow channel 2-1 in the material selection separation partition 2 can allow the water phase and the oil phase that cannot pass through on both sides to communicate with each other and enter the space suitable for each other for further separation, so that the hydrophilic and oleophobic selective materials and the oleophilic and hydrophobic selective materials can be used together in the oil-water separation device 1, making full use of the advantages of the hydrophilic and oleophobic selective materials and the hydrophilic and oleophobic selective materials in oil-water separation. It realizes the use of the oleophilic and hydrophobic materials and the hydrophilic and oleophobic materials together in an oil-water separation tank 1, greatly exerting the advantages of the two materials in oil-water separation, and improving the efficiency and purity of oil-water separation.

[0042] The oily wastewater enters the oil-water separation tank 1 on both sides of the material selection separation partition 2 from the oily wastewater inlet 3 in the device. After being filtered and separated by the hydrophilic-oleophobic and oleophilic-hydrophobic selective materials on both sides of the oil-water separation tank 1, the separated oil or water flows through the oil-water intercommunication flow channel 2-1 in the material selection separation partition 2 to each adaptive space for further separation. The separated oil and water are respectively stored in the oil storage tank 12 and the liquid recovery tank 13, and then transported to the application site according to the purpose of the oil and water.

[0043] The utility model has a simple structure and a reasonable design, reduces the volume and floor space of the separation equipment, effectively improves the oil-water separation effect, effectively utilizes the oily wastewater, protects the environment, reduces the production cost, and has a significant use effect.

[0044] Based on the above embodiment 1, the utility model also has the following embodiments:

[0045] A preferred embodiment: the oleophilic and hydrophobic material is hydrophobic styrene microspheres and hydrophobic materials obtained by chemical modification, such as quartz sand modified with dodecyltrimethoxysilane and ceramsite modified with hexadecyltrimethoxysilane.

[0046] A preferred embodiment: the oleophilic and hydrophobic material is fly ash particles. Fly ash is a natural hydrophobic material with low production cost. The oleophilic and hydrophobic material needs to be moistened with kerosene before use.

[0047] A preferred embodiment: the hydrophilic and oleophobic material is natural quartz sand microspheres or particles.

[0048] A preferred embodiment: the hydrophilic and oleophobic material is ceramsite. The above hydrophilic and oleophobic material can be moistened with clean water before use.

[0049] A preferred embodiment: the oil-water interconnecting flow channel 2-1 in the material selection separation partition 2 is a liquid flow hole or liquid flow groove densely distributed in the plate body.

[0050] A preferred embodiment: the aperture of the liquid flow hole or the width of the liquid flow groove in the oil-water interconnecting flow channel 2-1 is smaller than the outer diameter of the microspheres or particles made of oleophilic and hydrophobic materials and hydrophilic and oleophobic materials.

[0051] A preferred embodiment: the oily wastewater inlet 3 is connected to the wastewater delivery pipeline; the pipeline between the feed port 1 4 and the feed port 2 5 and the oil-water separation tank 1 below is respectively equipped with a feed port 1 control valve 6 and a feed port 2 control valve 7, which can conveniently control the added selected materials.

[0052] A preferred embodiment: A first-level oil outlet 10 and a first-level water outlet 11 at the bottom of the oil-water separation tank 1 on both sides of the material separation partition 2 are respectively provided with a first-level oil outlet valve 8 and a first-level water outlet valve 9 in the pipeline between the oil storage tank 12 and the liquid recovery tank 13. This facilitates the control of the separation speed of the oil phase and the separation speed of the water phase in the oil-water separation tank 1, and can further improve the purity and quality of the oil-water separation.

[0053] A preferred embodiment: A secondary oil outlet 14 and a secondary water outlet 15 are provided at the bottom of the oil storage tank 12 and the liquid recovery tank 13, and the connecting pipelines of the secondary oil outlet 14 and the secondary water outlet 15 are respectively equipped with an oil outlet control valve and a water outlet control valve and are connected to the oil pipeline network and the sewage reinjection pipeline network through the oil outlet control valve and the water outlet control valve.

[0054] The utility model arranges a material selection separation partition 2 in an oil-water separation tank 1, mixes the sewage entering through an oily sewage inlet 3 with the selective materials filled in a feeding port 1 4 and a feeding port 2 5 respectively, recovers the oil after separation and reuses or reprocesses the separated sewage, which is simple and convenient.

[0055] In fact, the utility model is also an improvement on the oil-water separation method. Under the action of the selective material, the utility model separates the oil phase from one side and the water phase from the other side. After the separation, the oil storage tank 12 and the liquid recovery tank 13 are used for subsequent recovery and utilization, which greatly improves the working efficiency of the separation equipment.

[0056] The embodiments described above are only typical embodiments, but the utility model is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and enlightenment of the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. Any modifications, equivalent replacements, improvements, etc. made within the creative spirit and creative concept of the utility model should be included in the protection scope of the utility model. Therefore, the protection scope is not limited to the above description.

Claims

1. A separation device with oil-water selective separation capability, provided with an oil-water separation tank, characterized in that: A material selection separation partition with an oil-water interconnecting flow channel is arranged in the oil-water separation tank, and the oily wastewater inlet outside the tank body is connected with both sides of the material selection separation partition in the oil-water separation tank; the oleophilic and hydrophobic materials and the hydrophilic and oleophobic materials are respectively loaded into the oil-water separation tanks on both sides of the material selection separation partition through the feeding port 1 and the feeding port 2; the lower part of the oil-water separation tank on the side equipped with the oleophilic and hydrophobic materials is connected to the oil storage tank, and the lower part of the oil-water separation tank on the side equipped with the hydrophilic and oleophobic materials is connected to the liquid recovery tank.

2. A separation device with oil-water selective separation capability as claimed in claim 1, characterized in that: The oleophilic and hydrophobic material is fly ash particles.

3. A separation device with oil-water selective separation capability as claimed in claim 1, characterized in that: The hydrophilic and oleophobic material is natural quartz sand microspheres or particles.

4. A separation device with oil-water selective separation capability as claimed in claim 1, characterized in that: The hydrophilic and oleophobic material is ceramsite.

5. The separation device with oil-water selective separation capability as claimed in claim 1, characterized in that: The oil-water interconnecting flow channels in the material selection separation partition are liquid flow holes or liquid flow grooves densely distributed in the plate body.

6. A separation device with oil-water selective separation capability as claimed in claim 5, characterized in that: The aperture of the liquid flow hole or the width of the liquid flow groove in the oil-water intercommunication flow channel is smaller than the outer diameter of the microspheres or particles made of oleophilic and hydrophobic materials and hydrophilic and oleophobic materials.

7. A separation device with oil-water selective separation capability as claimed in claim 5, characterized in that: The oily wastewater inlet is connected to the wastewater delivery pipeline; the pipelines between the feed port 1 and the feed port 2 and the oil-water separation tank below are respectively equipped with a feed port 1 control valve and a feed port 2 control valve.

8. A separation device with oil-water selective separation capability as claimed in claim 7, characterized in that: A first-level oil outlet valve and a first-level water outlet valve are respectively installed in the pipelines between the first-level oil outlet and the first-level water outlet at the bottom of the oil-water separation tank on both sides of the material selection separation partition and the oil storage tank and the liquid recovery tank.

9. A separation device with oil-water selective separation capability as claimed in claim 8, characterized in that: A secondary oil outlet and a secondary water outlet are arranged at the bottom of the oil storage tank and the liquid recovery tank. An oil outlet control valve and a water outlet control valve are respectively installed in the connecting pipelines of the secondary oil outlet and the secondary water outlet, and the oil outlet control valve and the water outlet control valve are respectively connected to the oil pipeline network and the sewage reinjection pipeline network through the oil outlet control valve and the water outlet control valve.

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