An oil-containing sewage treatment device

Abstract

The application provides an oily sewage treatment device, which comprises a micro-vortex coalescing cavity, a H-shaped inclined plate section and a coagulation separation cavity connected in sequence; the H-shaped inclined plate section comprises a H-shaped inclined plate, which comprises a wing and a support plate supporting the wing; the wing is configured to hinder the flow of fluid in the H-shaped inclined plate section along the length direction of the support plate. The device is pressure type, which reduces VOCs emission from the source, reduces the number of treatment equipment stages, fully utilizes the pressure energy of the incoming water, saves energy consumption and investment. By using the micro-vortex coalescing device, the coagulation reaction structure and the two H-shaped inclined plate sections, the oily sewage (such as oilfield produced water) is efficiently treated, and the oil and suspended solids in the water are removed. Through the specific structure, the length of the equipment is greatly reduced, so that the equipment is more flexible in actual use arrangement, and the length requirement of the occupied space is reduced.

Description

Technical Field

[0001] This document relates to, but is not limited to, the field of treating produced water from oil and gas fields, and particularly relates to, but is not limited to, an oily wastewater treatment device. Background Art

[0002] As the water cut of the produced fluid from oil fields is getting higher and higher, with the water cut of many oil fields reaching over 90%, a large amount of separated produced water needs to be treated. The produced water has a complex composition, and whether it is re-injected, reused or discharged, there are high requirements for the oil content and suspended solids in the water. The vast majority of produced water treatment stations adopt the following several processes:

[0003] "Incoming water → Natural sedimentation tank → Coagulation sedimentation tank → Buffer tank → Pump → Primary filtration → Secondary filtration → Purified water tank";

[0004] "Incoming water → Coagulation sedimentation → Buffer tank → Pump → Primary filtration → Secondary filtration → Purified water tank";

[0005] "Incoming water → Regulation tank → Air flotation machine → Buffer tank → Pump → Primary filtration → Secondary filtration → Purified water tank";

[0006] "Incoming water → Natural sedimentation → Reactor → Coagulation sedimentation → Buffer tank → Pump → Primary filtration → Secondary filtration → Purified water tank".

[0007] A large number of produced water treatment devices have problems such as many process stages, long residence time, large floor area, and a large amount of volatile organic compound (VOCs) emissions. Especially in small blocks and offshore oil fields, how to save floor area for efficient water treatment has become a difficult problem. Currently, the commonly used methods to save floor area and ensure the effluent quality include pressure type oil removal tanks, inclined plate sedimentation tanks, vertical oil removal tanks, etc. However, the sedimentation time of the vertical oil removal tank is relatively long, and internal renovation is difficult to construct. For the pressure type and inclined plate type, in order to ensure the effluent index, it is necessary to ensure the hydraulic residence time or the combination of multiple devices. In order to meet the application requirements of small blocks or offshore oil fields and relieve problems such as land use tension, long process, and complex operation, there is an urgent need for a device that can shorten the process flow, has complete treatment functions, and high treatment efficiency. Summary of the Invention

[0008] The following is an overview of the subject matter described in detail in this document. This overview is not intended to limit the scope of protection of the claims.

[0009] An exemplary embodiment of the present application provides an oily wastewater treatment device, including:

[0010] A micro-vortex coalescence chamber, a cross-shaped inclined plate section, and a coagulation separation chamber that are connected in sequence;

[0011] The cross-shaped inclined plate section includes cross-shaped inclined plates, and the cross-shaped inclined plates include wing pieces and support plates for supporting the wing pieces;

[0012] The fin is configured to hinder the flow of fluid in the cross-shaped inclined plate section along the length direction of the support plate.

[0013] In an embodiment provided by the present application, the direction of fluid movement configured to flow through the cross-shaped inclined plate forms an angle of 45° to 80° with the horizontal plane.

[0014] In an embodiment provided by the present application, the oil-containing sewage treatment device includes:

[0015] A micro-vortex coalescence chamber, which includes a micro-vortex coalescence device;

[0016] A coagulation separation chamber, which includes a flocculation structure filler;

[0017] A first cross-shaped inclined plate section, including a first cross-shaped inclined plate, which includes a first fin and a first support plate;

[0018] A second cross-shaped inclined plate section, including a second cross-shaped inclined plate, which includes a second fin and a second support plate;

[0019] The first fin is configured to hinder the flow of fluid in the first cross-shaped inclined plate section along the length direction of the first support plate;

[0020] The second fin is configured to hinder the flow of fluid in the second cross-shaped inclined plate section along the length direction of the second support plate;

[0021] The micro-vortex coalescence chamber, the first cross-shaped inclined plate section, the coagulation separation chamber, and the second cross-shaped inclined plate section are connected in sequence.

[0022] In an embodiment provided by the present application, the ratio of the spacing between adjacent first fins to the height of the first fin (the height of the first fin is the length perpendicular to the length direction of the first support plate) is (10 to 60):(10 to 60); in an embodiment provided by the present application, the height of the first fin can be 10 mm to 60 mm.

[0023] In an embodiment provided by the present application, the ratio of the height of the first fin to the spacing between adjacent two first support plates is (10 to 60):(40 to 150).

[0024] In an embodiment provided by the present application, the ratio of the spacing between adjacent second fins to the height of the second fin (the height of the second fin is the length perpendicular to the length direction of the second support plate) is (10 to 60):(10 to 60); in an embodiment provided by the present application, the height of the second fin can be 10 mm to 60 mm.

[0025] In one embodiment provided in this application, the ratio of the height of the second winglet to the distance between two adjacent second support plates is (10 to 60):(40 to 150).

[0026] In one embodiment provided in this application, the micro vortex coalescing device in the micro vortex coalescing cavity is a micro vortex coalescing ball filled with coalescing packing, and the length ratio of the outer diameter of the micro vortex coalescing ball to the outer diameter of the coalescing packing is 1:(0.125 to 0.5).

[0027] In one embodiment provided in this application, the diameter of the micro-vortex coalescing spheres in the micro-vortex coalescing cavity is 100mm to 300mm, and the cavity is filled with coalescing filler with a diameter of 25mm to 75mm.

[0028] In one embodiment provided in this application, the average density of the material in the micro-vortex coalescing device within the micro-vortex coalescing cavity is 0.90 × 10⁻⁶. 3 kg / m 3 Up to 1.1×10 3 kg / m 3 .

[0029] In one embodiment of this application, the flocculation structure packing material in the coagulation reaction chamber is spherical, and the size of the flocculation structure packing material in the coagulation reaction chamber is 100 mm to 300 mm; in another embodiment of this application, the density of the flocculation structure packing material in the coagulation reaction chamber is 1.0 × 10⁻⁶. 3 kg / m 3 Up to 1.1×10 3 kg / m 3 .

[0030] In one embodiment provided in this application, the produced water treatment device includes a first chamber and a second chamber. The first chamber includes a micro-vortex coalescence chamber and a first U-shaped inclined plate section, and the second chamber includes a coagulation reaction chamber and a second U-shaped inclined plate section.

[0031] In one embodiment provided in this application, the fluid movement direction in the micro-vortex coalescing cavity is perpendicular to the horizontal plane.

[0032] In one embodiment provided in this application, the direction of fluid movement in the coagulation separation chamber is perpendicular to the horizontal plane.

[0033] In one embodiment provided in this application, the fluid movement direction in the micro-vortex coalescence chamber and the coagulation separation chamber is perpendicular to the horizontal plane.

[0034] In one embodiment provided in this application, the oily wastewater treatment device further includes a buffer chamber, which includes a buffer zone; the first chamber, the second chamber, and the buffer chamber are combined to form a tank-like structure.

[0035] In another aspect, an exemplary embodiment of this application provides a method for treating oily wastewater, using the aforementioned oily wastewater treatment apparatus, comprising:

[0036] The residence time of the micro vortex coalescing cavity is 2 min to 20 min. In one embodiment provided in this application, the residence time of the micro vortex coalescing cavity is 5 min to 10 min.

[0037] The dwell time of the first Feng-shaped inclined plate segment is 10 min to 60 min. In one embodiment provided in this application, the dwell time of the first Feng-shaped inclined plate segment is 20 min to 40 min.

[0038] The residence time in the coagulation reaction chamber is 1 min to 20 min. In one embodiment provided in this application, the residence time in the coagulation reaction chamber is 5 min to 10 min.

[0039] The dwell time of the second Feng-shaped inclined plate segment is 10 min to 60 min. In one embodiment provided in this application, the dwell time of the second Feng-shaped inclined plate segment is 20 min to 40 min.

[0040] In one embodiment provided in this application, the oily wastewater treatment device further includes a buffer chamber, which includes a buffer zone. The residence time of the buffer zone is 5 to 30 minutes, preferably 10 to 15 minutes.

[0041] The micro-vortex coalescing sphere has a hollow structure, comprising:

[0042] A porous shell; the porous shell is provided with guide holes that connect the inside and outside of the micro vortex coalescing device;

[0043] The coalescing packing is disposed within the hollow structure.

[0044] The longest diameter of the flow guide hole is smaller than the shortest diameter of the coalescing packing.

[0045] In one embodiment provided in this application, the flow guide hole occupies 30% to 80% of the area of ​​the porous housing.

[0046] In one embodiment of this application, the micro vortex coalescing device is a sphere; in one embodiment of this application, the ratio of the outer diameter of the micro vortex coalescing device to the thickness of the porous shell is (100 to 300):(1 to 6); in one embodiment of this application, the ratio of the outer diameter of the micro vortex coalescing device to the diameter-length ratio of the guide hole is (100 to 300):(15 to 40).

[0047] In one embodiment provided in this application, a plurality of coalescing packings in a micro vortex coalescing device have space for rotational movement within a porous shell.

[0048] In one embodiment provided in this application, the porous shell material can be selected from any one or more plastic materials such as ABS, modified ABS, polypropylene, modified polypropylene, and polyethylene.

[0049] In one embodiment provided in this application, the material of the coalescing filler can be selected from any one or more plastic materials such as ABS, modified ABS, polypropylene, modified polypropylene, and polyethylene.

[0050] In one embodiment provided in this application, the length ratio of the outer diameter of the micro vortex coalescing device to the outer diameter of the coalescing packing is 1:(0.125 to 0.5).

[0051] In one embodiment provided in this application, the outer diameter of the micro vortex coalescing device can be from 100 mm to 300 mm.

[0052] In one embodiment provided in this application, the outer diameter of the coalescing packing can be from 25 mm to 75 mm. In another embodiment provided in this application, the outer diameter of the coalescing packing is larger than the diameter of the flow guide hole.

[0053] In one embodiment provided in this application, the coalescing packing is selected from any one or more of Pall ring packing, stepped ring packing, rectangular saddle ring packing, multifaceted hollow sphere packing, hollow sphere packing, porous sphere packing, Raschig ring packing, heterosaddle ring packing, and gear ring packing.

[0054] In one embodiment provided in this application, the average material density of the micro-vortex coalescing device is 0.90 × 10⁻⁶. 3 kg / m 3 Up to 1.1×10 3 kg / m 3 .

[0055] On the other hand, this application provides the application of the above-mentioned Feng-shaped inclined plate in the treatment of oily wastewater.

[0056] The present application provides an oily wastewater treatment device, which uses a micro-vortex coalescence chamber, a coagulation reaction chamber and two-stage H-shaped oil and suspended solid removal inclined plate sections to ensure that the effluent quality meets the standards. Structurally, it adopts a left-right chamber structure, greatly shortening the equipment length, reducing the overall length-diameter ratio and floor area of the equipment, and innovatively uses H-shaped inclined plates inside, strengthening the oil and suspended solid removal effect compared with the traditional inclined plate process. It is applicable to scenarios with tight land use such as small blocks and offshore oilfields, and also significantly improves the overall treatment effect of oily wastewater (such as the treatment of oilfield produced water) compared with the traditional process.

[0057] The beneficial effects of the technical solution provided by the present application include:

[0058] 1) The overall equipment is pressure type, which reduces VOC emissions at the source, reduces the number of treatment equipment stages, and fully utilizes the pressure energy of the incoming water, saving energy consumption and investment.

[0059] 2) The equipment uses a micro-vortex coalescence device, a coagulation reaction structure and two-stage H-shaped inclined plate sections to efficiently treat oily wastewater and remove oil and suspended solids in the water.

[0060] 3) By using the left-right chamber structure, the equipment length is greatly reduced, making the equipment more flexible in actual use layout and reducing the length requirement for the occupied space.

[0061] 4) The overall residence time of the equipment is shortened by 60% compared with multiple equipment in the conventional water treatment process, and it reduces VOC emissions and environmental pollution.

[0062] Other features and advantages of the present application will be described in the subsequent specification, and part of them will become obvious from the specification or be understood by implementing the present application. Other advantages of the present application can be achieved and obtained through the solutions described in the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] The drawings are used to provide an understanding of the technical solution of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation to the technical solution of the present application.

[0064] Figure 1 It is a schematic structural diagram (top view) of an oily wastewater treatment device described in an embodiment of the present application.

[0065] Figure 2 It is a schematic structural diagram (cross-sectional view of the first chamber) of an oily wastewater treatment device described in an embodiment of the present application.

[0066] Figure 3 It is a schematic structural diagram (cross-sectional view of the second chamber) of an oily wastewater treatment device described in an embodiment of the present application.

[0067] Figure 4A Schematic diagram of the cross-shaped inclined plate structure of an oil-containing sewage treatment device described in an embodiment of the present application Figure 1 .

[0068] Figure 4B Cross-sectional view perpendicular to the water flow direction of the cross-shaped inclined plate structure of an oil-containing sewage treatment device described in an embodiment of the present application.

[0069] Figure 5 Schematic diagram of the cross-shaped inclined plate structure of an oil-containing sewage treatment device described in an embodiment of the present application Figure 2 .

[0070] Figure 6 Schematic diagram of the micro-vortex coalescence device of an oil-containing sewage treatment device described in an embodiment of the present application

[0071] Figure 7 Schematic diagram of the micro-vortex coalescence device of an oil-containing sewage treatment device described in an embodiment of the present application

[0072] Figure 8 Schematic diagram of the flocculation structure filler of an oil-containing sewage treatment device described in an embodiment of the present application

[0073] Markings in the figure: 1, micro-vortex coalescence chamber; 11, device water inlet; 121, first vertical micro-vortex coalescence chamber; 122, second vertical micro-vortex coalescence chamber; 123, third vertical micro-vortex coalescence chamber; 124, fourth vertical micro-vortex coalescence chamber; 13, micro-vortex coalescence device; 131, diversion hole; 132, coalescence filler; 14, micro-vortex coalescence chamber connecting pipe; 15, weir plate leading to the first cross-shaped inclined plate section

[0074] 2, first cross-shaped inclined plate section; 21, first uniform water distribution hole plate; 22, first cross-shaped inclined plate; 221, first wing; 222, first support plate; 23, first oil collection pipe; 24, chemical addition pipe; 25, water outlet pipe leading to the coagulation reaction chamber; 26, first sludge discharge pipe

[0075] 3, coagulation reaction chamber; 31, coagulation reaction chamber water inlet; 321, first vertical coagulation reaction chamber; 322, second vertical coagulation reaction chamber; 323, third vertical coagulation reaction chamber; 324, fourth vertical coagulation reaction chamber; 33, flocculation structure filler; 34, coagulation reaction chamber connecting pipe; 35, weir plate leading to the second cross-shaped inclined plate section

[0076] 4. Second cross-shaped inclined plate section; 41. Second uniform water distribution hole plate; 42. Second cross-shaped inclined plate; 421. Second wing; 422 Second support plate; 43. Second oil collecting pipe; 44. Water outlet pipe leading to buffer chamber; 45. Second sludge discharge pipe; 5. Buffer chamber; 51. Equipment water outlet pipe. Detailed implementation mode

[0077] To make the purpose, technical solution and advantages of this application clearer and more understandable, the embodiments of this application are described in detail below. It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined arbitrarily with each other.

[0078] As Figures 1 to 8 shown, the embodiment of this application provides an oil-containing sewage treatment device, including:

[0079] A micro-vortex coalescence chamber, a cross-shaped inclined plate section and a coagulation separation chamber connected in sequence;

[0080] The cross-shaped inclined plate section includes a cross-shaped inclined plate, and the cross-shaped inclined plate includes a wing and a support plate for supporting the wing;

[0081] The wing is configured to hinder the fluid in the cross-shaped inclined plate section from flowing along the length direction of the support plate.

[0082] Exemplarily, the fluid movement direction of the cross-shaped inclined plate configured to flow through the cross-shaped inclined plate forms an angle of 45° to 80° with the horizontal plane.

[0083] Exemplarily, the oil-containing sewage treatment device includes:

[0084] A micro-vortex coalescence chamber 1, and a micro-vortex coalescence device 13 is included in the micro-vortex coalescence chamber 1;

[0085] A coagulation separation chamber 3, and a flocculation structure filler 33 is included in the coagulation separation chamber 3;

[0086] A first cross-shaped inclined plate section 2, including a first cross-shaped inclined plate 22, and the first cross-shaped inclined plate 22 includes a first wing 221 and a first support plate 222;

[0087] A second cross-shaped inclined plate section 4, including a second cross-shaped inclined plate 42, and the second cross-shaped inclined plate 42 includes a second wing 421 and a second support plate 422;

[0088] The first wing 221 is configured to hinder the fluid in the first cross-shaped inclined plate section 2 from flowing along the length direction of the first support plate 222;

[0089] The second wing 421 is configured to hinder the fluid in the second cross-shaped inclined plate section 4 from flowing along the length direction of the second support plate 422;

[0090] The micro-vortex coalescence chamber 1, the first cross-shaped inclined plate section 2, the coagulation separation chamber 3, and the second cross-shaped inclined plate section 4 are connected in sequence.

[0091] Exemplarily, the ratio of the distance between adjacent first fins to the height of the first fin (the height of the first fin is the length in the direction perpendicular to the first support plate of the first fin) is (10 to 60):(10 to 60); the ratio of the height of the first fin to the distance between adjacent two first support plates is (10 to 60):(40 to 150).

[0092] Exemplarily, the distance between adjacent first fins 221 is 10 mm to 60 mm; the length in the direction perpendicular to the first support plate 222 of the adjacent first fin 221 (i.e., the height of the first fin 221 extending outward on the first support plate 222) is 10 mm to 60 mm; exemplarily, the distance between adjacent first support plates 222 is 40 mm to 150 mm.

[0093] Exemplarily, the ratio of the distance between adjacent second fins to the height of the second fin (the height of the second fin is the length in the direction perpendicular to the second support plate of the second fin) is (10 to 60):(10 to 60); the ratio of the height of the second fin to the distance between adjacent two second support plates is (10 to 60):(40 to 150).

[0094] Exemplarily, the distance between adjacent second fins 421 is 10 mm to 60 mm; the length in the direction perpendicular to the second support plate 422 of the adjacent second fin 421 (i.e., the height of the second fin 421 extending outward on the second support plate 422) is 10 mm to 60 mm; exemplarily, the distance between adjacent second support plates 422 is 40 mm to 150 mm.

[0095] Exemplarily, the micro-vortex coalescence device 13 in the micro-vortex coalescence chamber 1 is a micro-vortex coalescence ball filled with coalescence packing 132. The micro-vortex coalescence ball is of a hollow structure and includes:

[0096] A porous shell; the porous shell is provided with diversion holes 131 communicating the inside and outside of the micro-vortex coalescence device 13;

[0097] Coalescence packing 132, and the coalescence packing 132 is arranged in the hollow structure,

[0098] The longest diameter of the diversion hole 131 is smaller than the shortest diameter of the coalescence packing 132.

[0099] Exemplarily, the diversion holes 131 account for 30% to 80% of the area of the porous shell.

[0100] For example, the micro vortex coalescing device 13 is a sphere; the ratio of the outer diameter of the micro vortex coalescing device 13 to the thickness of the porous shell is (100 to 300):(1 to 6); the ratio of the outer diameter of the micro vortex coalescing device 13 to the diameter-length ratio of the guide hole 131 is (100 to 300):(15 to 40).

[0101] For example, a plurality of coalescing packings 132 in one of the micro vortex coalescing devices 13 have space to rotate within a porous housing.

[0102] For example, the material of the porous shell can be selected from any one or more plastic materials such as ABS, modified ABS, polypropylene, modified polypropylene, and polyethylene.

[0103] For example, the material of the coalescing filler 132 can be selected from any one or more plastic materials such as ABS, modified ABS, polypropylene, modified polypropylene, and polyethylene.

[0104] For example, the length ratio of the outer diameter of the micro-vortex coalescing sphere to the outer diameter of the coalescing packing 132 is 1:(0.125 to 0.5). The outer diameter of the coalescing packing 132 is larger than the diameter of the guide hole.

[0105] For example, the diameter of the micro-vortex coalescing spheres in the micro-vortex coalescing cavity 1 is 100mm to 300mm, and they are filled with coalescing packing material with a diameter of 25mm to 75mm.

[0106] For example, the average density of the material in the micro-vortex coalescing device in the micro-vortex coalescing cavity 1 is 0.90 × 10⁻⁶. 3 kg / m 3 Up to 1.1×10 3 kg / m 3 .

[0107] For example, the coalescing packing is selected from any one or more of Pall ring packing, stepped ring packing, rectangular saddle ring packing, multifaceted hollow ball packing, hollow ball packing, porous ball packing, Raschig ring packing, heterosaddle ring packing, and gear ring packing.

[0108] The micro-vortex coalescence device improves coalescence efficiency through two mechanisms: collisional coalescence and wetting coalescence. At the same time, the device rotates under the action of water flow to complete self-cleaning, which is not easy to clog and can stably treat oily wastewater for a long time.

[0109] For example, the flocculation structure packing 33 in the coagulation reaction chamber 3 is spherical, and the size of the flocculation structure packing 33 in the coagulation reaction chamber 3 is 100mm to 300mm; the density of the material of the flocculation structure packing 33 in the coagulation reaction chamber 3 is 1.0×10⁻⁶. 3 kg / m 3 Up to 1.1×10 3 kg / m 3 The flocculation structure packing 33 is a hollow porous shell. When water containing coagulant and flocculant flows through the porous shell, eddies are generated, which further mix and collide the suspended solids and the agent in the water, gradually forming flocs. Then, it enters the next porous shell, where eddies are generated again. The flocs further adsorb suspended solids, and the large flocs gradually sink. At the same time, the suspended solids in the water are captured and swept away, while the smaller flocs continue to flow with the water.

[0110] For example, such as Figures 1 to 3 As shown, the produced water treatment device includes a first chamber and a second chamber. The first chamber includes a micro-vortex coalescence chamber 1 and a first U-shaped inclined plate section 2. The second chamber includes a coagulation reaction chamber 3 and a second U-shaped inclined plate section 4.

[0111] For example, such as Figure 2 As shown, the fluid motion direction in the micro-vortex coalescing cavity 1 is perpendicular to the horizontal plane.

[0112] For example, such as Figure 3 As shown, the direction of fluid movement in the coagulation separation chamber 3 is perpendicular to the horizontal plane.

[0113] For example, the fluid movement direction in both the micro-vortex coalescence chamber 1 and the coagulation separation chamber 3 is perpendicular to the horizontal plane.

[0114] For example, the oily wastewater treatment device further includes a buffer chamber, which includes a buffer zone; the first chamber, the second chamber, and the buffer chamber are combined to form a tank-like structure.

[0115] For example, such as Figure 1 As shown, the device is tank-shaped overall, and the device is divided into left and right cavities (with...). Figure 1 The two chambers are arranged in a mirror image with respect to the central axis (view from top to bottom, from left to right). The first chamber (right chamber) includes a micro-vortex coalescence chamber 1 and a first U-shaped inclined plate section 2. The second chamber (left chamber) includes a coagulation reaction chamber 3 and a second U-shaped inclined plate section 4. The oily wastewater treatment device also includes a buffer zone, with the end section of the equipment serving as a buffer chamber 5.

[0116] The oily sewage (oilfield produced water) enters the oily sewage treatment device from the micro-vortex coalescence chamber 1. The water flow passing through the micro-vortex coalescence chamber 1 enters the first cross-shaped inclined plate section 2 through the weir plate 15 leading to the first cross-shaped inclined plate section; after the water flow passes through the first cross-shaped inclined plate section 2, it is connected to the coagulation reaction chamber 3 of the second chamber (i.e., the left chamber) through a pipeline; the water flow passing through the coagulation reaction chamber 3 enters the second cross-shaped inclined plate section 4 through the weir plate 35 leading to the second cross-shaped inclined plate section; the water flow of the second cross-shaped inclined plate section 4 enters the buffer chamber 5 through the water collection pipe; the buffer chamber 5 is provided with an equipment water outlet. The equipment also has supporting facilities such as a sludge discharge pipe and an oil collection pipe.

[0117] Exemplarily, the residence time of the micro-vortex coalescence chamber 1 can be 2 min to 20 min, or the residence time of the micro-vortex coalescence chamber 1 can be 5 min to 10 min.

[0118] Exemplarily, the residence time of the first cross-shaped inclined plate section 2 can be 10 min to 60 min, or the residence time of the first cross-shaped inclined plate section 2 can be 20 min to 40 min.

[0119] Exemplarily, the residence time of the coagulation reaction chamber 3 can be 1 min to 20 min, or the residence time of the coagulation reaction chamber 3 can be 5 min to 10 min.

[0120] Exemplarily, the residence time of the second cross-shaped inclined plate section 4 can be 10 min to 60 min, or the residence time of the second cross-shaped inclined plate section 4 can be 20 min to 40 min.

[0121] Exemplarily, the residence time of the buffer chamber 5 can be 5 min to 30 min, or the residence time of the buffer chamber 5 can be 10 min to 15 min.

[0122] The overall residence time of the equipment is 1 h to 2 h, and the residence time of the traditional "natural sedimentation + coagulation sedimentation + buffering" process is 6 h to 7 h. The residence time is greatly shortened compared with the traditional multi-stage water treatment process.

[0123] Exemplarily, the micro-vortex coalescence chamber 1 is four vertical micro-vortex coalescence chambers. The micro-vortex coalescence device 13 is filled in the chambers, and the chambers are sequentially connected by the micro-vortex coalescence chamber connecting pipes 14. The water flow direction of the four vertical micro-vortex coalescence chambers is from bottom to top, and the water flow direction in the micro-vortex coalescence chamber connecting pipes 14 is from top to bottom.

[0124] Water flows into the bottom of the first vertical micro-vortex coalescence chamber 121. After passing through the micro-vortex coalescence device 13, it successively enters the second vertical micro-vortex coalescence chamber 122, the third micro-vortex coalescence chamber 123, and the fourth micro-vortex coalescence chamber 124 through the micro-vortex coalescence chamber connecting pipe 14. All four vertical micro-vortex coalescence chambers have water inlet at the bottom and water outlet at the top.

[0125] As Figure 4A , Figure 4B and Figure 5 shown, both the first cross-shaped inclined plate 22 and the second cross-shaped inclined plate 42 are double-sided fin inclined plates, and when viewed from above, they are connected end to end in a "cross" shape. The water flow direction is perpendicular to the fins. The water flow is disturbed at the edge of the fin plates, changing the local water flow direction to form a micro-vortex region. The water flow that is not affected or less affected by the fin disturbance will continue to flow forward between the inclined plates. This part of the water flow with less influence is the main flow area. A part of the water flow near the fins that is disturbed will form vortices, forming a vortex region. The water flow in the vortex region enters between the two fin plates. Under the condition of maintaining a certain flow velocity in the main flow area, a local circulation will be formed between the fin plates, which is called the circulation region. According to Stokes' law, oil droplets rise in the water flow, and suspended solids settle in the water flow. When the oil droplets or suspended solids are rising and falling, the oil droplets enter the micro-vortex region of the upper fins of the water flow, and the suspended solids enter the micro-vortex region of the lower fins of the water flow, and then are respectively carried into the circulation region adjacent to the fin plate. In the circulation region between the fin grids, both the oil droplets and the suspended solids have sufficient space and reaction time for collision coalescence and sedimentation. After the oil droplets collide and coalesce, they float upward along the fin plates, and the suspended solids spiral downward in the fin grids and settle on the inclined plate surface and slide off. For conventional side-flow inclined plates, after the oil droplets float to the top inclined plate of the water flow or the suspended solids settle to the bottom inclined plate of the water flow, the oil droplets and the suspended solids are affected by the component velocity of the water flow. The collision probability between the oil droplets and between the suspended solids is small, and the probability of secondary escape of the oil droplets and the suspended solids affected by the water flow is relatively large, resulting in a lower oil removal efficiency. Figure 4B Figure 11 is a cross-sectional view of the tank body with the viewing direction of the first cross-shaped inclined plate section and the second cross-shaped inclined plate section perpendicular to the ground, Figure 4B and the water flow direction in

[0126] is perpendicular to the paper surface. Before and after the first cross-shaped inclined plate section 2, there is a first uniform water distribution hole plate 21. After the water flow passes through the first cross-shaped inclined plate section 2, it enters from the lower water collection pipe. At the same time, there are coagulant and flocculant dosing ports on the pipe. The reagent and the water flow are preliminarily mixed in the pipeline, and the pipeline guides the coagulation separation group.

[0127] The coagulation reaction chamber 3 is composed of four vertical coagulation reaction chambers. The chamber is filled with flocculation structure fillers 33. The chambers are successively connected by coagulation reaction chamber connecting pipes 34. The water flow direction of the four vertical coagulation reaction chambers is from bottom to top, and the water flow direction in the coagulation reaction chamber connecting pipe 34 is from top to bottom.

[0128] The water flow enters from the bottom of the first vertical coagulation reaction chamber 321. After passing through the flocculation structure filler 33, it sequentially enters the second coagulation reaction chamber 322, the third coagulation reaction chamber 323, and the fourth coagulation reaction chamber 324 through the coagulation reaction chamber connecting pipe 34. All four vertical coagulation reaction chambers have bottom-inlet and top-outlet water flow.

[0129] The second cross-shaped inclined plate section 4 in the second chamber (i.e., the left chamber) is similar in structure to the first cross-shaped inclined plate section 2 in the first chamber (i.e., the right chamber). After passing through the coagulation separation group, the water contains a large amount of flocs. When passing through the second cross-shaped inclined plate section 4, according to the shallow pond theory, the removal efficiency of suspended solids is improved. After passing through the coagulation separation group, the residual suspended solids in the water are further removed. At the same time, there is still the effect of oil droplets coalescing and floating up in the inclined plate. The second cross-shaped inclined plate section 4 further reduces the oil content and suspended solid content in the water.

[0130] After the water flows out from the second cross-shaped inclined plate section 4 in the second chamber (i.e., the left chamber), it flows into the buffer chamber 5 through the water outlet pipe 44 leading to the buffer chamber 5. The buffer chamber 5 plays a role in regulating the smooth water outlet and also has a certain effect of natural sedimentation for oil and suspended solid removal.

[0131] The produced water flow enters from the equipment water inlet 11 at the bottom of the first vertical micro-vortex coalescence chamber 121 of the micro-vortex coalescence chamber 1, flows upward through the micro-vortex coalescence device 13. When the water flow passes through the diversion holes 131, it is affected by micro-vortices and collides and coalesces to form oil droplets that float up. The oil particles that are not collided and coalesced are adsorbed by the filler when passing through the coalescence filler 132, gradually accumulating to form an oil film, and finally forming oil droplets that break away from the filler and float up under the action of water flow and density difference, achieving the wetting coalescence effect. After the water flow passes through several micro-vortex coalescence devices 13, it enters the water collection port of the micro-vortex coalescence chamber connecting pipe 14 from the upper part. The connecting pipe discharges water at the bottom of the second vertical micro-vortex coalescence chamber 122, repeating the coalescence process in the first vertical micro-vortex coalescence chamber 121, then through the connecting pipe to the bottom of the third vertical micro-vortex coalescence chamber 123, repeating the coalescence process, and the connecting pipe to the fourth vertical micro-vortex coalescence chamber 124. After repeating the coalescence, it enters the first cross-shaped inclined plate section 2 through the weir plate 15 leading to the first cross-shaped inclined plate section at the upper part of the fourth vertical micro-vortex coalescence chamber 124. A first oil collection pipe 23 is provided at the top of the first chamber, and a first sludge discharge pipe 26 is provided at the bottom.

[0132] The water flowing into the first U-shaped inclined plate section 2 first passes through the first uniformly distributed perforated plate 21, ensuring a smooth and even flow. It then enters the first U-shaped inclined plate 22, where it passes through the first U-shaped inclined plate vanes 221, forming micro-vortices. Part of the flow then enters the area between the first U-shaped inclined plate vanes 221, forming an independent circulation zone unaffected by the main water flow. In this circulation zone between each first U-shaped inclined plate vane 221, oil droplets coalesce and float, while suspended solids sink. After oil and suspended solids are removed by the first U-shaped inclined plate 22, the water flows through the second first uniformly distributed perforated plate 21, and after stabilizing, enters the outlet pipe 25 leading to the coagulation reaction chamber 3. A dosing pipe 24 is installed in the pipe to add coagulant and flocculant, which are then initially mixed within the pipe.

[0133] The water containing the reagent enters the first vertical coagulation reaction chamber 3 through the inlet 31 of the coagulation reaction chamber 3. It flows upward through the flocculation structure packing 33 to flocculate the suspended solids, gradually forming large flocs that sink and are removed. Small flocs follow the water flow and enter the inlet of the connecting pipe 34 from the top. The connecting pipe leads to the bottom of the second vertical coagulation reaction chamber 322 and the water exits. The coagulation reaction and separation process in the first vertical coagulation reaction chamber 321 is repeated. Then, the water flows through the connecting pipe to the bottom of the third vertical coagulation reaction chamber 323 and the coagulation reaction and separation process is repeated. The connecting pipe leads to the fourth vertical coagulation reaction chamber 324 and the coagulation reaction and separation process is repeated. After the coagulation reaction and separation process is repeated, the water containing small flocs enters the second vertical coagulation reaction chamber 4 through the weir plate 35 leading to the second Feng-shaped inclined plate section 4 at the top of the fourth vertical coagulation reaction chamber 324.

[0134] The water flowing into the second U-shaped inclined plate section 4 first passes through a second uniformly distributed perforated plate 41, ensuring a smooth and even flow. It then enters the second U-shaped inclined plate 42, where it passes through the blades, creating micro-vortices. Part of the flow then enters the area between the blades, forming an independent circulation zone unaffected by the main water flow. In this circulation zone between each blade, oil particles coalesce and float, while flocs adsorb suspended solids and sink. A second oil collection pipe 43 is located at the top of the second chamber. Most of the flocs settle and are removed in the second U-shaped inclined plate section 4, discharged through the second mud discharge pipe 45 at the bottom. After oil and suspended solids are removed by the U-shaped inclined plate, the water flows through the second uniformly distributed perforated plate 41, where it is stabilized before entering the outlet pipe 44 leading to the buffer chamber 5.

[0135] Water enters from the upper part of the buffer chamber 5 and flows out from the equipment outlet pipe 51 at the bottom of the equipment after natural settling.

Claims

1. An oily wastewater treatment device, characterized in that, The oil-containing sewage treatment device is divided into chambers on the left and right, including a first chamber and a second chamber. The first chamber includes a micro-vortex coalescence chamber and a first cross-shaped inclined plate section, and the second chamber includes a coagulation separation chamber and a second cross-shaped inclined plate section; The micro-vortex coalescence chamber includes a micro-vortex coalescence device; the micro-vortex coalescence device in the micro-vortex coalescence chamber is a micro-vortex coalescence ball filled with coalescence packing, and the ratio of the outer diameter of the micro-vortex coalescence ball to the outer diameter of the coalescence packing is 1:(0.125 to 0.5); The coagulation separation chamber includes flocculation structure packing; The first cross-shaped inclined plate section includes a first cross-shaped inclined plate, and the first cross-shaped inclined plate includes a first wing and a first support plate; The second cross-shaped inclined plate section includes a second cross-shaped inclined plate, and the second cross-shaped inclined plate includes a second wing and a second support plate; The first wing is configured to hinder the fluid in the first cross-shaped inclined plate section from flowing along the length direction of the first support plate; The second wing is configured to hinder the fluid in the second cross-shaped inclined plate section from flowing along the length direction of the second support plate; The micro-vortex coalescence chamber, the first cross-shaped inclined plate section, the coagulation separation chamber and the second cross-shaped inclined plate section are connected in sequence; The cross-shaped inclined plate is configured such that the movement direction of the fluid flowing through the cross-shaped inclined plate forms an angle of 45° to 80° with the horizontal plane.

2. The oily wastewater treatment device according to claim 1, characterized in that, The ratio of the spacing between adjacent first wings to the height of the first wing is (10 to 60):(10 to 60); The ratio of the height of the first wing to the spacing between adjacent two first support plates is (10 to 60):(40 to 150).

3. The oily wastewater treatment apparatus according to any one of claims 1 to 2, characterized in that, The ratio of the spacing between adjacent second wings to the height of the second wing is (10 to 60):(10 to 60); The ratio of the height of the second wing to the spacing between adjacent two second support plates is (10 to 60):(40 to 150).

4. The oily wastewater treatment apparatus according to any one of claims 1 to 2, characterized in that, The density of the flocculation structure packing material in the coagulation separation chamber is 1.0 × 10⁻⁶. 3 kg / m 3 Up to 1.1×10 3 kg / m 3 .

5. The oily wastewater treatment device according to claim 4, characterized in that, The diameter of the micro-vortex coalescence ball in the micro-vortex coalescence chamber is 100 mm to 300 mm, and it is filled with coalescence packing with a diameter of 25 mm to 75 mm.

6. The oily wastewater treatment device according to claim 4, characterized in that, The average density of the material in the micro-vortex coalescing device within the micro-vortex coalescing cavity is 0.90 × 10⁻⁶. 3 kg / m 3 Up to 1.1×10 3 kg / m 3 .

7. The oily wastewater treatment device according to claim 4, characterized in that, The movement direction of the fluid in the micro-vortex coalescence chamber is perpendicular to the horizontal plane; Or, the movement direction of the fluid in the coagulation separation chamber is perpendicular to the horizontal plane; Or, the movement directions of the fluids in the micro-vortex coalescence chamber and the coagulation separation chamber are perpendicular to the horizontal plane.

8. The oily wastewater treatment device according to claim 4, characterized in that, The micro-vortex coalescence ball is of a hollow structure, including: A porous shell; the porous shell is provided with diversion holes for connecting the inside and outside of the micro-vortex coalescence device; Coalescence packing, and the coalescence packing is arranged in the hollow structure, The longest diameter of the diversion hole is smaller than the shortest diameter of the coalescence packing.

9. The oil-containing sewage treatment device according to claim 8, wherein, The diversion holes account for 30% to 80% of the area of the porous shell; The ratio of the outer diameter of the micro-vortex coalescence device to the thickness of the porous shell is (100 to 300):(1 to 6); The ratio of the outer diameter of the micro-vortex coalescence device to the diameter length of the diversion hole is (100 to 300):(15 to 40); There is a space for rotational movement of the plurality of coalescence packings in one micro-vortex coalescence device within the porous shell; The porous shell is made of any one or more of ABS, polypropylene and polyethylene plastic materials; The coalescing filler material is selected from any one or more of ABS, polypropylene and polyethylene plastic materials.

10. The oily wastewater treatment device according to claim 9, characterized in that, The coalescing packing is selected from any one or more of the following: Pall ring packing, stepped ring packing, rectangular saddle ring packing, hollow ball packing, Raschig ring packing, heterosaddle ring packing, and gear ring packing.

11. The oily wastewater treatment apparatus according to any one of claims 1 to 2, characterized in that, The oily wastewater treatment device further includes a buffer chamber, which contains a buffer zone. The first chamber, the second chamber, and the buffer chamber combine to form a can-shaped structure.

12. A method for treating oily wastewater, using the oily wastewater treatment apparatus according to any one of claims 1 to 11, characterized in that, include: The residence time in the micro vortex coalescence cavity is 2 min to 20 min; The dwell time of the first Feng-shaped inclined plate segment is 10 min to 60 min; The residence time in the coagulation separation chamber is 1 min to 20 min; The dwell time of the second Feng-shaped inclined plate section is 10 minutes to 60 minutes; The oily wastewater treatment device further includes a buffer chamber, which contains a buffer zone, and the residence time of the buffer zone is 5 to 30 minutes.

13. The method according to claim 12, characterized in that, The residence time in the micro vortex coalescence cavity is 5 to 10 minutes; The dwell time of the first Feng-shaped inclined plate segment is 20 to 40 minutes; The residence time in the coagulation separation chamber is 5 to 10 minutes; The dwell time of the second Feng-shaped inclined plate section is 20 to 40 minutes; The dwell time in the buffer zone is 10 to 15 minutes.

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