Automatic rotational flow and air flotation integrated device suitable for offshore platform

Abstract

The utility model discloses an automatic rotational flow and air floatation integrated device suitable for an offshore platform, which comprises a barrel body, and a centrifugal coalescence cavity and an inner cone are sequentially arranged in the barrel body from top to bottom; a dirty oil cavity is formed in the side wall of the upper part of the cylinder body and is communicated with an oil discharge port formed in the outer wall of the cylinder body through a dirty oil discharge pipe; a water inlet, a water outlet and a plurality of gas-dissolved water inlets are formed in the outer wall of the cylinder body; the water inlet is communicated with the centrifugal coalescence cavity through a water inlet pipeline; the water outlet is communicated with the side wall of the inner cone through a water outlet pipe; and the air-dissolved water inlet is communicated with a water-dissolved air inlet pipe arranged in the cylinder body, an outlet of the water-dissolved air inlet pipe is provided with a jet pipe, and the jet pipe is arranged at the bottom of the inner cone. According to the utility model, jet flow, centrifugal coalescence, cyclone separation, dissolved gas mixing and air flotation separation technologies are fused together, the flow of each section is stable and does not interfere with each other, and the treatment efficiency is improved; the whole structure is small, the separation effect is good, the automation degree is high, adjustment is convenient, and integrated setting is facilitated.

Description

Technical Field

[0001] The utility model belongs to multi-stage separation and treatment equipment for oily sewage on an offshore platform, and specifically relates to an automatic cyclone flotation integrated device suitable for an offshore platform. Background Art

[0002] As my country's land oil resources continue to decrease, offshore oil development will become a focus. Offshore oil production will produce a large amount of oily wastewater, and failure to treat it will cause serious environmental pollution. As offshore oil production continues, the water content in the produced fluid continues to rise, which puts higher demands on oily wastewater treatment technology. Therefore, the development of advanced and reliable oily wastewater treatment technology can not only effectively solve the production problems of large produced fluid output and poor conventional process effects, but also ensure the smooth development of offshore oil production and maintain the health and safety of the marine environment.

[0003] Traditional oily wastewater treatment technologies such as gravity sedimentation, biological treatment, filtration and flotation have problems such as large consumption of reagents, long treatment time, large land occupation, high investment and maintenance costs, which increase the cost of offshore oil production. The cyclone flotation integrated technology is very suitable for offshore platform production needs due to its compact structure, small footprint, light weight and good treatment effect. This technology was studied earlier abroad and is relatively mature. It has formed multiple generations of serial products. It can only be understood from the description of product structure and field performance test, and less disclosure of relevant technical details and optimization aspects.

[0004] Traditional flotation cyclone technology is based on a new understanding of the collision, aggregation, breakage, adhesion and migration of microbubbles and oil droplets in turbulent flow fields and cyclone centrifugal fields. It has the advantages of compact structure, small footprint, simple operation and maintenance. However, this technology mostly chooses the "flotation first, then cyclone" process, which is limited by the inlet flow of the cyclone and has a low processing capacity. Utility Model Content

[0005] The utility model is proposed to overcome the shortcomings in the prior art, and its purpose is to provide an automatic cyclone air flotation integrated device suitable for offshore platforms.

[0006] The utility model is realized by the following technical solutions:

[0007] An automatic cyclone flotation integrated device suitable for offshore platforms comprises a cylinder, a centrifugal coalescence chamber and an inner cone arranged in sequence from top to bottom in the cylinder; a dirty oil chamber is arranged on the upper side wall of the cylinder, and the dirty oil chamber is connected to an oil discharge port arranged on the outer wall of the cylinder through a dirty oil discharge pipe; a water inlet, a water outlet and a plurality of dissolved air water inlets are arranged on the outer wall of the cylinder; the water inlet is connected to the centrifugal coalescence chamber through a water inlet pipeline; the water outlet is connected to the side wall of the inner cone through a water outlet pipe; the dissolved air water inlet is connected to a dissolved air water inlet pipe arranged in the cylinder, a jet pipe is arranged at the outlet of the dissolved air water inlet pipe, and the jet pipe is arranged at the bottom of the inner cone.

[0008] In the above technical solution, the plurality of dissolved air water inlets are evenly distributed along the circumference.

[0009] In the above technical solution, the outlet of the dissolved air water inlet pipe is a tangential liquid inlet.

[0010] In the above technical scheme, the centrifugal coalescing chamber includes an overflow pipe, a main body and a tail pipe which are connected in sequence from top to bottom, an inner vertebral tube is sleeved in the tail pipe, the upper end of the inner vertebral tube is inserted into the main body, and a spiral channel is sleeved at the top of the inner vertebral tube; an overflow port is formed at the top of the overflow pipe, the side wall of the main body forms an inlet of the coalescing chamber, the bottom of the tail pipe forms an underflow port, and the inlet of the coalescing chamber is connected to the water inlet pipeline.

[0011] In the above technical solution, the overflow pipe is threadedly connected to the main body; the inner spinal tube includes a connecting column, a transition column and a tapered column that are connected once; the connecting column is inserted into the threaded tube of the spiral channel, and the two are welded and fixed.

[0012] In the above technical solution, the inner cone is fixed to the inner wall of the cylinder through a bracket.

[0013] In the above technical solution, the cylinder, the centrifugal coalescing chamber and the inner cone are coaxially arranged.

[0014] In the above technical solution, a sewage outlet is arranged at the lowest point of the bottom surface of the cylinder.

[0015] In the above technical solution, a plurality of legs are evenly distributed on the bottom of the cylinder.

[0016] In the above technical solution, a liquid level meter is arranged in the dirty oil chamber.

[0017] The beneficial effects of the utility model are:

[0018] The utility model provides an automatic cyclone flotation integrated device suitable for offshore platforms, which integrates jet, centrifugal coalescence, cyclone separation, dissolved air mixing and flotation separation technologies, and each section has stable flow without interfering with each other, thereby improving the processing efficiency; the utility model has a small overall structure, good separation effect, high degree of automation, convenient adjustment, and is conducive to integrated setting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model;

[0020] Figure 2 It is a schematic diagram of the structure of the centrifugal coalescence chamber in the utility model;

[0021] Figure 3 It is an exploded view of the centrifugal coalescence chamber in the utility model;

[0022] Figure 4 yes Figure 2 Sectional view along the AA direction;

[0023] Figure 5 It is a structural schematic diagram of the spiral channel of the centrifugal coalescence chamber in the utility model.

[0024] in:

[0025] 1. Cylinder; 2. Dissolved air water inlet; 3. Support legs; 4. Inner cone; 5. Bracket; 6. Water outlet; 7. Water inlet; 8. Jet tube; 9. Centrifugal coalescing chamber; 10. Oil outlet; 11. Sewage outlet; 12. Sewage oil chamber; 13. Overflow pipe; 14. Main body; 15. Tail pipe; 16. Bottom flow outlet flange; 17. Coalescing chamber inlet; 18. Inner vertebral tube; 19. Overflow outlet flange; 20. Spiral channel.

[0026] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0028] like Figure 1 As shown, an automatic cyclone flotation integrated device suitable for offshore platforms comprises a cylinder 1, a centrifugal coalescing chamber 9 and an inner cone 4 arranged in sequence from top to bottom in the cylinder 1; a dirty oil chamber 12 is arranged on the upper side wall of the cylinder 1, and the dirty oil chamber 12 is connected to an oil discharge port 10 arranged on the outer wall of the cylinder 1 through a dirty oil discharge pipe;

[0029] The outer wall of the cylinder 1 is provided with a water inlet 7, a water outlet 6 and a plurality of dissolved air water inlets 2;

[0030] The water inlet 7 is connected to the centrifugal coalescing chamber 9 through a water inlet pipeline;

[0031] The water outlet 6 is connected to the side wall of the inner cone 4 through a water outlet pipe, and the water outlet pipe is coiled in a square shape and sleeved on the outside of the inner cone 4;

[0032] The plurality of dissolved air water inlets 2 are evenly distributed along the circumference, and are connected to the inlet of the dissolved air water inlet pipe arranged in the cylinder 1. The outlet of the dissolved air water inlet pipe is provided with a jet pipe 8, and the jet pipe 8 is arranged at the bottom of the inner cone 4. The outlet of the dissolved air inlet pipe water is tangentially liquid-inlet;

[0033] like Figures 2 to 5 As shown, the centrifugal coalescence chamber 9 includes an overflow pipe 13, a main body 14 and a tail pipe 15 which are sequentially connected from top to bottom. An inner spinal tube 18 is sleeved in the tail pipe 15. The upper end of the inner spinal tube 18 is inserted into the main body 14, and a spiral channel 20 is sleeved at the top of the inner spinal tube 18.

[0034] The overflow pipe 13 has an overflow flange 19 formed at the top and a connecting threaded body formed at the bottom, and the overflow pipe 13 and the main body 14 are threadedly connected through the threaded body;

[0035] The main body 14 is a cylindrical structure with an open bottom. A threaded hole is formed in the middle of the top surface of the main body 14, which is threadedly connected to the connecting threaded body of the overflow pipe 13. The outer wall of the bottom end of the main body 14 forms a connecting flange. A mounting plate is formed inside the main body 14, a through hole is formed in the middle of the mounting plate, and a spiral channel 20 is arranged on the bottom surface of the mounting plate. The side wall of the main body 14 forms a coalescing chamber inlet 17, which is connected to the water inlet pipeline.

[0036] The spiral channel 20 includes a connecting tube and a threaded tube, and the connecting column is inserted into the through hole of the mounting plate of the main body 14;

[0037] The tail pipe 15 has a connection flange at the top and a bottom flow port flange 16 at the bottom. The connection flange of the tail pipe 15 is fixedly connected to the connection flange at the bottom of the main body 14.

[0038] The inner spinal tube 18 includes a connecting column, a transition column and a tapered column connected once; the connecting column is inserted into the threaded tube of the spiral channel 20, and the two are welded and fixed; the tapered column gradually decreases in diameter from the top to the bottom;

[0039] The influent first enters the spiral channel of the main part of the centrifugal coalescing chamber, where the influent rotates downward, and the waste oil separated by centrifugation is discharged from the overflow pipe; the condensed oil after coalescence is discharged from the overflow port, and the initially separated sewage is discharged from the tail flow port of the bottom pipe;

[0040] The tail pipe 15 of the centrifugal coalescing chamber 9 is inserted into the inner cone 4;

[0041] The inner cone 4 is fixed to the inner wall of the cylinder 1 through a bracket 5. The inner cone 4 is a hollow frustum structure with a diameter gradually decreasing from top to bottom and open at both ends.

[0042] The cylinder 1, the centrifugal coalescing chamber 9 and the inner cone 4 are coaxially arranged.

[0043] A sewage outlet 11 is arranged at the lowest point of the bottom surface of the cylinder 1 for discharging sludge.

[0044] A plurality of legs 3 are evenly distributed on the bottom of the cylinder 1 .

[0045] The dirty oil chamber 12 is a cylindrical chamber with an open upper end, which is used to collect the dirty oil residue on the surface;

[0046] A liquid level gauge is arranged in the dirty oil chamber 12, and the dirty oil can be automatically discharged according to the change of the liquid level.

[0047] The cylinder 1 is provided with a mud discharge area, a dissolved gas release area (inner cone), a sedimentation area (reaction separation area), a centrifugal agglomeration area (water pretreatment section) and a sewage discharge area (dirty oil collection chamber) from bottom to top.

[0048] The working principle of this utility model:

[0049] The oily wastewater enters the pretreatment section of the cylinder 1 from the water inlet 7 and enters through the inlet of the centrifugal coalescing chamber 9 installed in the pretreatment section. Under the action of centrifugal force, the oil-water two phases evenly distributed in the cyclonic field migrate toward the axis of the light oil. Due to the speed difference of the oil droplets in the radial, tangential and axial directions, the oil droplets collide, which provides the possibility for the coalescence of small oil droplets. The lighter oil phase overflows from the overflow pipe at the top of the coalescer, enters the dirty oil chamber and is discharged through the oil discharge pipe of the oil collection chamber; the sewage discharged from the centrifugal coalescing bottom pipe is mixed with the water-soluble gas released by the inner cone, and the jet tube in the inner cone will swirl the mixed fluid. The microbubbles collide and attach with the floating oil scum and then separate. The floating oil scum is collected and discharged through the oil collection chamber at the upper part of the cylinder, and the treated sewage is discharged from the drainage pipe at the lower middle of the cylinder, and the sediment is discharged from the sewage pipe at the bottom of the cylinder.

[0050] In order to meet the requirements of offshore platform use, the cylinder needs to be fully sealed and operated under pressure. First, the platform covering gas enters the cylinder to ensure the lowest operating pressure of the cylinder, and the cylinder pressure is adjusted through the cylinder pressure sensor; the dissolved gas source comes from the covering gas in the cylinder, and the excess gas in the dissolved gas tank returns to the cylinder; the cylinder is equipped with a liquid level gauge, and water inlet is stopped when the liquid level is higher than the upper limit, and water outlet is stopped when it is lower than the lower limit; the dirty oil chamber is equipped with a liquid level gauge, and sewage is discharged at a high liquid level, and the oil discharge valve is closed at a low liquid level.

[0051] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0052] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "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 utility model 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 utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0053] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0054] The applicant declares that the above is only a specific implementation method of the present utility model, but the protection scope of the present utility model is not limited thereto. The technicians in the relevant technical field should understand that any changes or substitutions that can be easily thought of by the technicians in the relevant technical field within the technical scope disclosed in the present utility model fall within the protection scope and disclosure scope of the present utility model.

Claims

1. An automatic cyclone flotation integrated device suitable for offshore platforms, characterized by: The invention comprises a cylinder (1), a centrifugal coalescence chamber (9) and an inner cone (4) arranged in sequence from top to bottom in the cylinder (1); a dirty oil chamber (12) is arranged on the upper side wall of the cylinder (1), and the dirty oil chamber (12) is connected to an oil discharge port (10) arranged on the outer wall of the cylinder (1) through a dirty oil discharge pipe; a water inlet (7), a water outlet (6) and a plurality of dissolved air water inlets (2) are arranged on the outer wall of the cylinder (1); the water inlet (7) is connected to the centrifugal coalescence chamber (9) through a water inlet pipeline; the water outlet (6) is connected to the side wall of the inner cone (4) through a water outlet pipe; the dissolved air water inlet (2) is connected to a dissolved air water inlet pipe arranged in the cylinder (1), and a jet pipe (8) is arranged at the outlet of the dissolved air water inlet pipe, and the jet pipe (8) is arranged at the bottom of the inner cone (4).

2. The automatic cyclone flotation integrated device suitable for offshore platforms according to claim 1 is characterized in that: The plurality of dissolved air water inlets (2) are evenly distributed along the circumference.

3. The automatic cyclone flotation integrated device suitable for offshore platforms according to claim 1 is characterized in that: The outlet of the dissolved air water inlet pipe is tangentially liquid inlet.

4. The automatic cyclone flotation integrated device suitable for offshore platforms according to claim 1 is characterized in that: The centrifugal coalescence chamber (9) comprises an overflow pipe (13), a main body (14) and a tail pipe (15) which are connected in sequence from top to bottom; an inner spinal tube (18) is sleeved in the tail pipe (15); the upper end of the inner spinal tube (18) is inserted into the main body (14); and a spiral channel (20) is sleeved at the top of the inner spinal tube (18); an overflow port (19) is formed at the top of the overflow pipe (13); a coalescence chamber inlet (17) is formed on the side wall of the main body (14); an underflow port (16) is formed at the bottom of the tail pipe (15); and the coalescence chamber inlet (17) is communicated with a water inlet pipeline.

5. The automatic cyclone flotation integrated device suitable for offshore platforms according to claim 4 is characterized in that: The overflow pipe (13) is threadedly connected to the main body (14); the inner cone tube (18) comprises a connecting column, a transition column and a tapered column connected once; the connecting column is inserted into the threaded tube of the spiral channel (20), and the two are welded and fixed.

6. The automatic cyclone flotation integrated device suitable for offshore platforms according to claim 1 is characterized in that: The inner cone (4) is fixed to the inner wall of the cylinder (1) via a bracket (5).

7. The automatic cyclone flotation integrated device suitable for offshore platforms according to claim 1 is characterized in that: The cylinder (1), the centrifugal coalescing chamber (9) and the inner cone (4) are coaxially arranged.

8. The automatic cyclone flotation integrated device suitable for offshore platforms according to claim 1 is characterized in that: A sewage outlet (11) is provided at the lowest point of the bottom surface of the cylinder (1).

9. The automatic cyclone flotation integrated device suitable for offshore platforms according to claim 1, characterized in that: A plurality of supporting legs (3) are evenly distributed on the bottom of the cylinder (1).

10. The automatic cyclone flotation integrated device suitable for offshore platforms according to claim 1, characterized in that: A liquid level meter is arranged in the dirty oil chamber (12).

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