An anti-sloshing oil-water separation module suitable for water treatment of deep-sea oil and gas platforms

Abstract

The application discloses an anti-sloshing oil-water separation module suitable for water treatment of a deep-sea oil and gas platform, which comprises a plurality of layers of anti-sloshing oil-water separation plates, the anti-sloshing oil-water separation plates sequentially comprise a wave-breaking energy dissipation unit and a sine / cosine type anti-sloshing oil-water separation unit along the main flow direction of fluid, and the two are integrated combination structures; the wave-breaking energy dissipation unit is located on the flow-approaching side and comprises a horizontal flow stabilizing table and a trapezoidal slope; the horizontal flow stabilizing table is arranged downstream of the trapezoidal slope; the wave-breaking energy dissipation unit and the sine / cosine type anti-sloshing oil-water separation unit are connected through a continuous transition structure; and the plurality of layers of anti-sloshing oil-water separation plates are connected and fixed into a whole through fixing structures arranged along the height direction. The anti-sloshing oil-water separation module can make the sloshing amplitude of water bodies significantly decrease and the oil removal efficiency greatly improve.

Description

Technical Field

[0001] This invention belongs to the field of oily wastewater treatment and oil-water separation technology. Specifically, it relates to an anti-sloshing oil-water separation module suitable for water treatment of deep-sea oil and gas platforms. Background Technology

[0002] As offshore oil and gas resource development gradually shifts from nearshore to deep-sea areas, floating oil and gas platforms such as floating production storage and offloading (FPSO) units and semi-submersible platforms are widely used in offshore oil and gas production processes. These platforms continuously generate oily wastewater during operation, originating from produced water, equipment flushing water, and domestic sewage. To meet offshore environmental discharge requirements, oil-water separation devices are typically installed on the platforms to treat the oily wastewater.

[0003] However, compared to land-based or fixed offshore platforms, deep-sea floating oil and gas platforms operate in complex sea conditions and are inevitably subject to rolling, pitching, and heave motions due to external loads such as wind, waves, and currents. The liquid within the oil-water separator oscillates back and forth with the platform's movement, easily creating significant level fluctuations and internal flow field disturbances. This weakens the gravity stratification, coalescence, and stable flow conditions during oil-water separation, leading to decreased separation efficiency and even problems such as oil-water entrainment and fluctuations in effluent quality, posing a significant challenge to the stable separation of the three phases of oil, gas, and water.

[0004] Currently, most existing oil-water separation devices are designed for terrestrial or steady-state conditions. Their internal structures typically employ flat plates, corrugated plates, inclined plates, or porous media, relying primarily on gravity separation and slow flow conditions to achieve oil-water separation. However, under the swaying conditions of floating platforms, these structures are insufficient to effectively suppress large-scale liquid swaying. Some regular periodic structures may even couple with the swaying frequency, further amplifying internal liquid surface fluctuations. Furthermore, in existing technologies, anti-swaying components and oil-water separation components are often independent, lacking a coordinated design for the swaying conditions of floating platforms, making it difficult to simultaneously meet the dual requirements of liquid sway suppression and efficient oil-water separation. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects in the prior art and provide an anti-sloshing oil-water separation module suitable for water treatment of deep-sea oil and gas platforms. This module can effectively reduce the influence of liquid sloshing on the internal flow field without significantly increasing system complexity and energy consumption, and maintain stable and reliable oil-water separation performance under sloshing conditions.

[0006] The objective of this invention can be achieved through the following technical solutions: This invention provides an anti-sloshing oil-water separation module suitable for water treatment on deep-sea oil and gas platforms. The anti-sloshing oil-water separation module includes several layers of anti-sloshing oil-water separation plates. Along the main fluid flow direction, each anti-sloshing oil-water separation plate sequentially includes a wave-breaking energy-dissipating unit and a sinusoidal / cosine-type anti-sloshing oil-water separation unit. These two units are integrated into a single structure and are housed within the oil-water separation device. This structure is used to reduce liquid sloshing and achieve efficient oil-water separation under the rolling, pitching, and heave conditions of a floating platform. The wave-breaking energy-dissipating unit is located on the upstream side and includes a horizontally stable flow platform and a trapezoidal slope. The horizontally stable flow platform is located downstream of the trapezoidal slope. The wave-breaking energy-consuming unit and the sine / cosine type anti-sloshing oil-water separation unit are connected by a continuous transition structure. The continuous transition structure is a connecting plate, the two sides of which are tangentially transitioned to the surfaces of the wave-breaking energy-consuming unit and the sine / cosine type anti-sloshing oil-water separation unit, respectively, to ensure the structural continuity and appearance smoothness of the connection. The continuous transition structure is used to rectify and redistribute the fluid after the sloshing is weakened by the wave-breaking energy-consuming unit, so that the flow state entering the sine / cosine type anti-sloshing oil-water separation unit is more stable and uniform. The several layers of anti-sloshing oil-water separation plates are connected and fixed into a whole by a fixing structure set along the height direction. The fixing structure is used to limit the spacing between adjacent anti-sloshing oil-water separation plates and ensure the stability of the overall module.

[0007] In some embodiments of the present invention, the overall length of the anti-sloshing oil-water separation module is 500-1000mm, the width is 100-400mm, and the height is 100-400mm; the length of the horizontal stabilizing platform is 50-100mm, and the projected length of the trapezoidal slope in the horizontal direction is 10-100mm; the length of the sine / cosine type anti-sloshing oil-water separation unit 30 is 400-750mm.

[0008] In some embodiments of the present invention, the surface of the horizontal flow platform has a rough structure; the arithmetic mean roughness Ra of the horizontal flow platform is 10 to 200 μm.

[0009] In some embodiments of the present invention, the surface of the trapezoidal slope is configured as a curved surface structure with non-periodic undulations along the main direction or a continuously undulating curved surface structure with non-constant curvature.

[0010] In some embodiments of the present invention, the surface of the trapezoidal slope is configured as a curved surface structure with non-periodic undulation along the main direction. The non-periodic undulation curved surface structure is a structure formed by sequentially connecting several hook-shaped curved segments. The hook-shaped curved segments are formed by alternating connections of several curved surfaces and inclined surfaces. At least one of the following is different between adjacent hook-shaped curved segments: radius of curvature R, undulation amplitude H, or axial spacing D, so as to avoid forming a periodic structure.

[0011] Furthermore, the hook-shaped segment is represented as y=f(x), and the radius of curvature R is as follows: Where x represents the distance of the hook-shaped segment from the origin along the main flow direction on the horizontal reference plane, and y represents the distance of the hook-shaped segment from the horizontal reference plane in the vertical direction, used to characterize the curvature of the undulating surface structure; the undulation amplitude H is the height difference in the vertical direction between the peak of the hook-shaped segment and the lowest point of the slope, used to characterize the strength of the undulating surface structure; the axial spacing D is the horizontal spacing between the starting points of the slopes of two adjacent hook-shaped segments, used to characterize the spatial scale of the undulating surface structure in the flow direction.

[0012] In some embodiments of the present invention, the hook-shaped segment includes at least one curved surface with a hook-shaped profile. The curvature direction of the curved surface is bent in the opposite direction or deflected laterally relative to the mainstream direction, which is used to induce local flow separation and reattachment. The arc α of the hook-shaped segment is defined as the arc of the segment, which is used to characterize the degree of bending of the segment. The arc α of different hook-shaped segments is not exactly the same, and the value range of arc α is 0° < α ≤ 180°.

[0013] Furthermore, the angle β between the inclined plane and the horizontal plane ranges from 10 to 80°; preferably, the angle between the first inclined plane and the horizontal plane is 30 to 60°, and the length is 5 to 20 mm; the angle between the second inclined plane and the horizontal plane is 40 to 80°, and the length is 5 to 20 mm; the arc α of the first curved surface is 60 to 90°, and the arc α of the second curved surface is 120 to 150°.

[0014] In some embodiments of the present invention, the inclined surface is disposed between adjacent curved surfaces as a curved surface transition connection segment; the inclined surface has an axial length parameter L, and the axial length parameter L of different inclined surfaces is not exactly the same; the axial length parameter L and the arc α of the adjacent hook-shaped curved segment form an aperiodic combination matching relationship, and the formation of a periodic push wave structure is avoided by differentiating the parameters L and α.

[0015] In some embodiments of the present invention, the trapezoidal ramp is configured as a continuously undulating surface structure with non-constant curvature along the main direction. This continuously undulating surface consists of at least two segments, which are sequentially spliced ​​together along the main direction. Each segment satisfies a polynomial. ; in, a i The constant coefficient determines the shape and trend of the curve; the value of n is different for each segment of the surface, and 2≤n≤6; the origin of the coordinate system is the starting position of each segment of the surface, where x represents the distance of the surface from the origin along the main direction on the horizontal reference plane, and y represents the distance of the surface from the horizontal reference plane in the vertical direction.

[0016] In some embodiments of the present invention, the sinusoidal / cosine-type anti-sloshing oil-water separation unit includes several multi-stage corrugated separation plates arranged along the main flow direction; the multi-stage corrugated separation plates have a sinusoidal, cosine-type, or approximately sinusoidal / cosine-type non-periodic undulating structure, and the shape of the corrugated separation plates satisfies the formula y i = A i sin( w i x ); in, i The sequence number of the separation plate, 2≤ i ≤8; Taking the starting position of each wavy separation plate as the origin of the coordinate system, x represents the distance of the wavy separation plate from the origin along the main flow direction on the horizontal reference plane, and y represents the distance of the wavy separation plate from the horizontal reference plane in the vertical direction. A i The constant coefficient represents the first... i The shape amplitude coefficient of the separation plate; w i For the first i Wavenumber coefficient of the stage separation plate w i >0, the wavenumber coefficient w i With wavelength λ i Satisfying Relationships w i = 2 π / λ i , λ i For the first i The wavelength of the multi-stage separation plate; at least two stages of the multi-stage corrugated separation plate are present. A i and w i They are not entirely the same.

[0017] In some embodiments of the present invention, the corrugated separation plate has multiple through holes at the crests and troughs, and the diameter of the through holes is... r More than twice the maximum oil droplet size in oily wastewater, pore size r With a diameter of 0.5–2 mm, it promotes the aggregation and flotation of dispersed oil droplets while ensuring continuous passage of the liquid phase, thereby improving the collection efficiency of small-diameter dispersed oil.

[0018] In some embodiments of the present invention, the adjacent anti-sloshing oil-water separation plates may be arranged at equal intervals or non-equal intervals along the height direction, and the adjacent anti-sloshing oil-water separation plates may be aligned or staggered in terms of waveform undulation.

[0019] Furthermore, the spacing between adjacent anti-sloshing oil-water separation plates is 2 to 15 mm.

[0020] Compared with the prior art, the present invention has the following outstanding advantages: 1. This invention has a compact structure and strong adaptability, and is suitable for the treatment of oily wastewater in complex sea conditions of deep-sea floating oil and gas platforms. It can effectively reduce the impact of liquid sloshing on the internal flow field and maintain stable and reliable oil-water separation performance under sloshing conditions, and has good engineering application prospects.

[0021] 2. By setting up a wave-breaking energy-consuming unit, this invention effectively weakens the large-scale fluctuations generated by the liquid under the swaying condition of the floating platform, reducing the adverse effects of free liquid surface undulation on the oil-water separation process; at the same time, this invention adopts a non-periodic undulating curved surface structure or a non-constant curvature structure to avoid the formation of a regular periodic wave pushing structure, reducing the risk of coupling resonance between liquid swaying and the structure.

[0022] 3. This invention utilizes a sinusoidal / cosine-type anti-sloshing oil-water separation unit to achieve the synergistic effect of flow deflection, shear enhancement, and oil droplet coalescence, maintaining stable oil-water separation performance under sloshing conditions. Simultaneously, the multi-layer anti-sloshing oil-water separation plate of this invention forms an integral structure through modular stacking and fixed connection, ensuring structural safety while achieving synergistic control of residence time, flow damping, and separation efficiency, thereby improving separation efficiency. Attached Figure Description

[0023] Figure 1 This is a front view (aligned arrangement) of the first anti-sloshing oil-water separation module structure of the present invention. Figure 2 This is a front view (misaligned arrangement) of the second anti-sloshing oil-water separation module structure of the present invention. Figure 3 This is a schematic diagram of the wave-breaking energy-consuming unit described in this invention, which uses a non-periodic undulating curved surface structure. Figure 4 This is a schematic diagram of the wave-breaking energy-consuming unit described in this invention, which uses a continuously undulating surface structure with non-constant curvature. Figure 5 This is a top view of the anti-sloshing oil-water separator structure.

[0024] Drawing number explanation: 10-Anti-swaying oil-water separation plate, 20-Wave-breaking energy-dissipating unit, 30-Sine / cosine type anti-swaying oil-water separation unit, 21-Horizontal smooth flow platform, 22-Trapezoidal slope, 221-Surface No. 1, 222-Slope No. 1, 223-Slope No. 2, 224-Surface No. 2, 31-Through hole, 40-Continuous transition structure, 50-Fixed structure. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0026] mechanism: Oily wastewater first enters the anti-sloshing oil-water separation module, flowing through the wave-breaking energy dissipation unit. This unit, through its non-periodic undulating curved surface structure, induces multi-scale flow separation and energy dissipation, effectively mitigating large-scale fluctuations generated by the liquid under floating platform sloshing conditions and reducing the adverse effects of free surface undulations on subsequent oil-water separation processes. Simultaneously, the non-periodic structure avoids the risk of coupling resonance with the liquid sloshing frequency. The fluid, after being treated by the wave-breaking energy dissipation unit, undergoes rectification and redistribution through a continuous transition connection structure, stabilizing the flow state before entering the sinusoidal / cosine-type anti-sloshing oil-water separation unit. In this unit, the wave-shaped separation plates, through the synergistic effect of surface-induced flow deflection, shear enhancement, and oil droplet coalescence, cause dispersed oil droplets to continuously coalesce into large-diameter droplets that float and separate. The staggered arrangement of adjacent wave-shaped separation plates weakens the coordinated vibration of the liquid in the height direction, further suppressing the overall sloshing response. Meanwhile, the through holes at the crests and troughs of the wave-shaped separation plate ensure the continuous passage of the liquid phase while promoting the coalescence and flotation of dispersed oil droplets, thereby improving the collection efficiency of small-diameter dispersed oil.

[0027] Example 1 This embodiment describes an anti-sloshing oil-water separation module suitable for water treatment on deep-sea oil and gas platforms, such as... Figures 1-2 As shown, the anti-sloshing oil-water separation module includes several layers of anti-sloshing oil-water separation plates 10. The anti-sloshing oil-water separation plates 10 include, in sequence along the main fluid flow direction, a wave-breaking energy-dissipating unit 20 and a sine / cosine type anti-sloshing oil-water separation unit 30. The two are integrated into a single structure and are jointly installed inside the oil-water separation device. They are used to reduce liquid sloshing and achieve efficient oil-water separation under the conditions of rolling, pitching, and heave of the floating platform. The wave-breaking energy-dissipating unit 20 is located on the upstream side and includes a horizontal stabilizing platform 21 and a trapezoidal slope 22. The horizontal stabilizing platform 21 is located downstream of the trapezoidal slope 22. The wave-breaking energy-consuming unit 20 and the sine / cosine type anti-sloshing oil-water separation unit 30 are connected by a continuous transition structure 40. The continuous transition structure 40 is a connecting plate, and the two sides of the connecting plate are tangentially transitioned to the surfaces of the wave-breaking energy-consuming unit 20 and the sine / cosine type anti-sloshing oil-water separation unit 30, respectively, to ensure the structural continuity and appearance flatness of the connection. It is used to rectify and redistribute the fluid after the sloshing is weakened by the wave-breaking energy-consuming unit 20, so that the flow state entering the sine / cosine type anti-sloshing oil-water separation unit 30 is more stable and uniform. The several layers of anti-sloshing oil-water separation plates 10 are connected to each other and fixed into a whole by a fixing structure 50 set along the height direction. The fixing structure 50 is used to limit the spacing between adjacent anti-sloshing oil-water separation plates 10 and ensure the stability of the overall module.

[0028] Furthermore, the overall length of the anti-sloshing oil-water separation module is 500-1000mm, the width is 100-400mm, and the height is 100-400mm; the length of the horizontal stabilizing platform 21 is 50-100mm, and the projected length of the trapezoidal ramp 22 in the horizontal direction is 10-100mm; the length of the sine / cosine type anti-sloshing oil-water separation unit 30 is 400-750mm.

[0029] Furthermore, the surface of the horizontal stabilizing platform 21 has a rough structure to further dissipate the fluid kinetic energy and stabilize it as it enters the downstream sinusoidal / cosine type anti-sloshing oil-water separation unit; preferably, the arithmetic mean roughness Ra of the horizontal stabilizing platform 21 is 10 to 200 μm.

[0030] Furthermore, the surface of the trapezoidal ramp 22 is configured as a curved surface structure with non-periodic undulations along the main direction or a continuously undulating curved surface structure with non-constant curvature.

[0031] Combination Figure 3 As shown, the surface of the trapezoidal slope 22 is configured as a non-periodic undulating curved surface structure along the main direction. The non-periodic undulating curved surface structure is a structure formed by connecting several hook-shaped curved segments in sequence. The hook-shaped curved segments are formed by alternating connections of several curved surfaces and inclined surfaces. At least one of the following is different between adjacent hook-shaped curved segments: radius of curvature R, undulation amplitude H, or axial spacing D, so as to avoid forming a periodic structure.

[0032] Furthermore, the hook-shaped segment is represented as y = f(x) The radius of curvature R is as follows: The coordinate system is used to characterize the curvature of the undulating surface structure, with the starting position of the hook-shaped segment as the origin. Here, x represents the distance of the hook-shaped segment from the origin along the main flow direction on the horizontal reference plane, and y represents the distance of the hook-shaped segment from the horizontal reference plane in the vertical direction. The hook-shaped segment has an undulation amplitude H, which is the height difference in the vertical direction between the peak of the hook-shaped segment's surface and the lowest point of the slope, used to characterize the strength of the undulating surface structure. The axial spacing D is the horizontal distance between the starting points of the slopes of two adjacent hook-shaped segments, used to characterize the spatial scale of the undulating surface structure in the flow direction.

[0033] Furthermore, the hook-shaped segment includes at least one surface with a hook-shaped profile. The curvature direction of the surface bends in the opposite direction or deflects laterally relative to the mainstream direction to induce local flow separation and reattachment. The arc α of the hook-shaped segment is defined as the arc of the segment, which is used to characterize the degree of bending of the segment. The arc α of different hook-shaped segments is not exactly the same, and the value range of arc α is 0° < α ≤ 180°.

[0034] Combination Figure 3 As shown, the angle β between the inclined plane and the horizontal plane ranges from 10 to 80°; preferably, the angle between the first inclined plane 222 and the horizontal plane is 30 to 60°, and the length is 5 to 20 mm; the angle between the second inclined plane 223 and the horizontal plane is 40 to 80°, and the length is 5 to 20 mm; the arc α of the first curved surface 221 is 60 to 90°, and the arc α of the second curved surface 224 is 120 to 150°.

[0035] Furthermore, the inclined surface is set between adjacent curved surfaces as a transition connection segment between the curved surfaces; the inclined surface has an axial length parameter L, and the axial length parameter L of different inclined surfaces is not exactly the same; the axial length parameter L and the arc α of the adjacent hook-shaped curved segment form an aperiodic combination matching relationship, and the formation of a periodic wave structure is avoided by differentiating the parameters L and α.

[0036] Furthermore, as an alternative, the trapezoidal ramp 22 is configured as a continuously undulating surface structure with non-constant curvature along the main direction, combined with... Figure 4 As shown, the continuous undulating surface consists of at least two segments, which are sequentially spliced ​​together along the main direction. Each segment satisfies a polynomial. ; Among them, a i The constant coefficient determines the shape and trend of the curve; the value of n is different for each segment of the surface, and 2≤n≤6; the origin of the coordinate system is the starting position of each segment of the surface, where x represents the distance of the surface from the origin along the main direction on the horizontal reference plane, and y represents the distance of the surface from the horizontal reference plane in the vertical direction.

[0037] Furthermore, the sinusoidal / cosine-type anti-sloshing oil-water separation unit 30 includes several multi-stage corrugated separation plates arranged along the main flow direction; the multi-stage corrugated separation plates generally have a non-periodic undulating structure of sinusoidal, cosine, or approximately sinusoidal / cosine type, the first... i The shape of the corrugated separation plate satisfies the formula y i = A i sin( w i x ); in, i The sequence number of the separation plate, 2≤ i ≤8; Taking the starting position of each wavy separation plate as the origin of the coordinate system, x represents the distance of the wavy separation plate from the origin along the main flow direction on the horizontal reference plane, and y represents the distance of the wavy separation plate from the horizontal reference plane in the vertical direction. A i The constant coefficient represents the first... i The shape amplitude coefficient of the separation plate; w i For the first i Wavenumber coefficient of the stage separation plate w i >0, the wavenumber coefficient w i With wavelength λ i Satisfying Relationships w i = 2 π / λ i , λ i For the first i The wavelength of the multi-stage separation plate; at least two stages of the multi-stage corrugated separation plate are present. A i and w i They are not entirely the same.

[0038] Combination Figure 5 As shown, the corrugated separation plate has multiple through holes 31 at its crests and troughs, and the diameter of the through holes 31 is... r More than twice the maximum oil droplet size in oily wastewater, pore size r With a diameter of 0.5–2 mm, it promotes the aggregation and flotation of dispersed oil droplets while ensuring continuous passage of the liquid phase, thereby improving the collection efficiency of small-diameter dispersed oil.

[0039] Furthermore, the adjacent anti-sloshing oil-water separator plates 10 can be arranged at equal or non-equal intervals along the height direction, and the adjacent anti-sloshing oil-water separator plates 10 can be aligned in terms of waveform undulation (e.g., ...). Figure 1 ) or misaligned arrangement (such as Figure 2 ).

[0040] Furthermore, the spacing between adjacent anti-sloshing oil-water separation plates 10 is 2 to 15 mm.

[0041] Application Example 1 This application example uses the anti-sloshing oil-water separation module for deep-sea oil and gas platform water treatment from Example 1. The module has an overall length of approximately 600 mm, with the wave-breaking energy-consuming unit 20 occupying 100 mm and the sine / cosine type anti-sloshing oil-water separation unit 30 occupying 430 mm. The width is approximately 200 mm and the height is approximately 200 mm. The number of anti-sloshing oil-water separation plates 10 is approximately 15 layers, the spacing between adjacent anti-sloshing oil-water separation plates is approximately 3 mm, the diameter R of the through hole 31 is 1 mm, and the adjacent separation plates are arranged in a staggered manner in terms of waveform undulation.

[0042] The trapezoidal ramp 22 of the wave-breaking energy-dissipating unit 20 has an upstream surface structure with non-periodic undulating curved surface structure, such as... Figure 3 As shown, the undulating surface formed by the combination of different curvatures and slopes weakens the large-scale sloshing of the liquid before it enters the separation zone; the sine / cosine type anti-sloshing oil-water separation unit adopts a multi-stage wave-shaped separation plate structure, and different wave-shaped separation plates are not completely the same in terms of undulation characteristics, so as to promote oil droplet coalescence and separation.

[0043] Furthermore, the trapezoidal ramp 22 within the wave-breaking energy-consuming unit 20 is arranged in alternating patterns of two hook-shaped curved segments. The first hook-shaped segment has an undulation amplitude of 6.75 mm, an axial spacing of 10.1 mm, a first arc surface curvature of 90°, a first inclined surface axial length of 7 mm, and a first inclined surface angle of 45° with the horizontal plane. The second hook-shaped segment has an undulation amplitude of 8.38 mm, an axial spacing of 10.5 mm, a second arc surface curvature of 150°, a second inclined surface axial length of 7 mm, and a second inclined surface angle of 60° with the horizontal plane. The horizontally stable flow platform 21 has a length of 70 mm.

[0044] Furthermore, the sinusoidal / cosine-type anti-sloshing oil-water separation unit 30 includes several multi-stage corrugated separation plates arranged along the main flow direction; the multi-stage corrugated separation plates have a sinusoidal, cosine-type, or approximately sinusoidal / cosine-type non-periodic undulating structure. Specifically, the first-stage corrugated separation plate has the following shape: y 1= 2.5 sin( x The second-stage corrugated separation plate has the following shape:y 2= 2.4 sin(0.3 x Two types of wave line separation plates are arranged alternately.

[0045] Application Example 2 This application example uses the anti-sloshing oil-water separation module for deep-sea oil and gas platform water treatment from Example 1. The overall length of the module is approximately 600 mm, with the wave-breaking energy-consuming unit 20 occupying 100 mm and the sine / cosine type anti-sloshing oil-water separation unit 30 occupying 420 mm. The width is approximately 200 mm and the height is approximately 200 mm. The anti-sway oil-water separation plates consist of approximately 15 layers, arranged in a non-equidistant manner along the height direction. From top to bottom, the distance between the first and second anti-sway oil-water separation plates is 5mm, the distance between the second and third anti-sway oil-water separation plates is 8mm, the distance between the third and fourth anti-sway oil-water separation plates is 13mm, and so on, until the overall module height requirement is met. Adjacent layers of anti-sway oil-water separation plates are arranged in a staggered manner, with the second layer recessed by 35mm compared to the first layer, and the third layer recessed by 10mm compared to the first layer, and so on, in a cyclical manner.

[0046] Furthermore, the upstream surface of the trapezoidal ramp 22 of the wave-breaking energy-consuming unit 20 adopts a continuous undulating surface structure with non-constant curvature. This continuous undulating surface consists of 8 segments, and each segment from S1 to S8 satisfies a polynomial. The polynomial corresponding to S1 is y1 = 0.2x + 0.8x. 2 -1.5x 3 +1.2x 4 -0.5x 5 +0.08x 6 The polynomial corresponding to S2 is y² = 0.05 + 0.2x + 4.86x 2 -6.57x 3 +2.46x 4 The polynomial corresponding to S3 is y3 = 0.02 + 0.15x + 5.2x 2 -7.1x 3 +2.73x 4 The polynomial corresponding to S4 is y4 = 0.03 + 0.35x + 2.85x 2 -2.23x 3 The polynomial corresponding to S5 is y5 = 0.02 + 0.08x + 5.1x 2 -8.6x 3 +6.75x 4 -2.1x 5The polynomial corresponding to S6 is y6 = 0.02 + 9.5x. 3 -14.25x 4 +5.7x 5 The polynomial corresponding to S7 is y7 = 0.03 + 9.2x 3 -13.8x 4 +5.52x 5 The polynomial corresponding to S8 is y8 = 0.04 + 0.1x + 4.6x 2 -7.2x 3 +5.6x 4 -1.75x 5 ;like Figure 4 As shown, this enhances the randomization energy dissipation effect; the length of the horizontal steady flow platform 21 is 80mm.

[0047] Furthermore, the sinusoidal / cosine-type anti-sloshing oil-water separation unit 30 includes several multi-stage corrugated separation plates arranged along the main flow direction; the multi-stage corrugated separation plates have a sinusoidal, cosine-type, or approximately sinusoidal / cosine-type non-periodic undulating structure. Specifically, the first-stage corrugated separation plate has the following shape: y 1= 2.5 sin( x The second-stage corrugated separation plate has the following shape: y 2= 2.4 sin(0.3 x Two types of wave line separation plates are arranged alternately.

[0048] Application Comparative Example 1 A traditional corrugated plate oil-water separation module with an overall size close to or the same as that in the above application examples 1-2 was selected. The traditional corrugated plate module adopts a regular periodic corrugated plate structure, without a dedicated wave-breaking energy-consuming structure, and the corrugated plates are arranged at equal intervals and aligned.

[0049] Performance testing Under the same influent oil concentration (500 mg / L), the same treated water volume, and the same sloshing conditions, the three oil-water separation modules were compared and tested. Wave sensors were installed at the positions before (equipment inlet) and after (equipment outlet) the fluid flows through each module to test the degree of water sloshing at those positions. The test results are shown in Table 1.

[0050] Table 1 As can be seen from the data in Table 1, under steady-state conditions, the water sloshing amplitude of the three implementation structures is very small, and the oil content at the outlet is similar. The effect of application examples 1-2 of the present invention is slightly better than that of the traditional corrugated plate. Under simulated equipment sloshing conditions such as roll, pitch, and heave, it can be found that application examples 1-2 of the present invention can achieve high oil removal efficiency, and the water sloshing amplitude is significantly smaller than that of the traditional corrugated plate. Especially under heave sloshing conditions, the oil removal efficiency of the traditional corrugated plate drops significantly. At the same time, the overall effect of application example 2, which uses a non-constant curvature undulating surface, is slightly better than that of application example 1.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present application in any way. Although the present application discloses the preferred embodiment as described above, it is not intended to limit the present application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of the present application using the disclosed technical content are equivalent to equivalent implementation cases. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention are still within the scope of the technical solution.

Claims

1. An anti-sloshing oil-water separation module suitable for water treatment on deep-sea oil and gas platforms, characterized in that, The anti-sloshing oil-water separation module includes several layers of anti-sloshing oil-water separation plates. The anti-sloshing oil-water separation plates include, in sequence along the mainstream fluid direction, a wave-breaking energy-dissipating unit and a sine / cosine type anti-sloshing oil-water separation unit, which are integrated into a single structure. The wave-breaking energy-dissipating unit is located on the upstream side and includes a horizontal stabilizing platform and a trapezoidal slope. The horizontal stabilizing platform is located downstream of the trapezoidal slope. The wave-breaking energy-consuming unit and the sine / cosine type anti-sloshing oil-water separation unit are connected by a continuous transition structure. The continuous transition structure is a connecting plate. The two sides of the connecting plate are tangentially transitioned to the surfaces of the wave-breaking energy-consuming unit and the sine / cosine type anti-sloshing oil-water separation unit, respectively, to ensure the structural continuity and appearance flatness of the connection. The several layers of anti-sloshing oil-water separation plates are connected to each other and fixed into a whole by a fixing structure set along the height direction.

2. The anti-sloshing oil-water separation module for deep-sea oil and gas platform water treatment according to claim 1, characterized in that, The overall length of the anti-sloshing oil-water separation module is 500-1000mm, the width is 100-400mm, and the height is 100-400mm; the length of the horizontal stabilizing platform is 50-100mm, and the projected length of the trapezoidal slope in the horizontal direction is 10-100mm; the length of the sine / cosine type anti-sloshing oil-water separation unit is 400-750mm.

3. The anti-sloshing oil-water separation module for water treatment of deep-sea oil and gas platforms according to claim 1, characterized in that, The surface of the horizontal flow platform has a rough structure, and the arithmetic mean roughness Ra of the horizontal flow platform is 10 to 200 μm.

4. The anti-sloshing oil-water separation module for water treatment of deep-sea oil and gas platforms according to claim 1, characterized in that, The surface of the trapezoidal slope is configured as a curved surface structure with non-periodic undulations along the main direction or a continuously undulating curved surface structure with non-constant curvature.

5. The anti-sloshing oil-water separation module for deep-sea oil and gas platform water treatment according to claim 4, characterized in that, The surface of the trapezoidal slope is configured as a non-periodic undulating curved surface structure along the main direction. The non-periodic undulating curved surface structure is a structure formed by connecting several hook-shaped curved segments in sequence. The hook-shaped curved segments are formed by alternating connections of several curved surfaces and inclined surfaces. At least one of the following is different between adjacent hook-shaped curved segments: radius of curvature R, undulation amplitude H, or axial spacing D, so as to avoid forming a periodic structure.

6. The anti-sloshing oil-water separation module for water treatment of deep-sea oil and gas platforms according to claim 5, characterized in that, The arc α of the hook-shaped segment is defined as the arc of the segment, and the value of arc α is in the range of 0° < α ≤ 180°; the value of the angle β between the inclined plane and the horizontal plane is in the range of 10 to 80°.

7. The anti-sloshing oil-water separation module for deep-sea oil and gas platform water treatment according to claim 4, characterized in that, The trapezoidal ramp is configured as a continuous undulating surface structure with non-constant curvature along the main direction. This continuous undulating surface consists of at least two segments, which are sequentially spliced ​​together along the main direction. Each segment satisfies a polynomial. ; in, a i The constant coefficient determines the shape and trend of the curve; the value of n is different for each segment of the surface, and 2≤n≤6; the origin of the coordinate system is the starting position of each segment of the surface, x represents the distance of the surface from the origin along the main direction on the horizontal reference plane, and y represents the distance of the surface from the horizontal reference plane in the vertical direction.

8. The anti-sloshing oil-water separation module for deep-sea oil and gas platform water treatment according to claim 1, characterized in that, The sine / cosine type anti-sloshing oil-water separation unit includes several multi-stage corrugated separation plates arranged along the main flow direction; the multi-stage corrugated separation plates have a non-periodic undulating structure in the form of sine, cosine, or approximately sine / cosine.

9. The anti-sloshing oil-water separation module for water treatment of deep-sea oil and gas platforms according to claim 1, characterized in that, The corrugated separation plate has multiple through holes at its crests and troughs, and the diameter of the through holes is... r It is 0.5 to 2 mm.

10. The anti-sloshing oil-water separation module for deep-sea oil and gas platform water treatment according to claim 1, characterized in that, The adjacent anti-sway oil-water separator plates are arranged at equal or non-equal intervals along the height direction, and the adjacent anti-sway oil-water separator plates are arranged in alignment or staggered arrangement in terms of waveform undulation.

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