Separation device and separation method

Abstract

The invention relates to a separation device and a separation method, and relates to the technical field of deep sea oil and gas field produced liquid separation equipment. The separation device comprises a shell, a separation chamber and a liquid inlet pipe, an oil phase outlet pipeline, a solid phase outlet pipeline and a water phase outlet pipeline are arranged on the shell, and the oil phase outlet pipeline and the solid phase outlet pipeline are located at the top and the bottom of the shell respectively; the separation chamber is arranged in the shell, and the water phase outlet pipeline is located between the separation chamber and the solid phase outlet pipeline; the liquid inlet pipe is arranged in the shell in a penetrating mode, and one end of the liquid inlet pipe is communicated with the lower portion of the separation chamber in a tangent mode. According to the technical scheme, the problems that an existing separation device is too large in size, too heavy and not ideal in separation effect can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of deep-sea oil and gas field produced liquid separation equipment, and in particular to a separation device and a separation method. Background Art

[0002] With the rapid development of marine engineering technology and equipment, the exploration and development of marine oil and gas resources has expanded from shallow waters to deep seas. Currently, deep-sea oil and gas exploration and development mostly utilizes underwater production systems, which can complete processes such as oil-water separation, gas-liquid separation, and wastewater treatment on the seabed, reducing the workload on offshore platforms.

[0003] The underwater separator is the core equipment of the underwater production system. Existing underwater separators generally use the principles of gravity separation and centrifugal separation for separation, but they generally have problems such as being too large, too heavy, and having unsatisfactory separation effects and low recovery rates. Summary of the Invention

[0004] The embodiments of the present invention provide a separation device and a separation method, which can solve the problems of existing separation devices being too large in size, too heavy, and having unsatisfactory separation effects.

[0005] In a first aspect, an embodiment of the present invention provides a separation device, comprising:

[0006] A shell, wherein the shell is provided with an oil phase outlet pipe, a solid phase outlet pipe and a water phase outlet pipe, wherein the oil phase outlet pipe and the solid phase outlet pipe are respectively located at the top and the bottom of the shell;

[0007] a separation chamber disposed in the shell and in communication with the shell, wherein the water phase outlet pipe is located between the separation chamber and the solid phase outlet pipe;

[0008] A liquid inlet pipe is provided in the shell, and one end of the liquid inlet pipe is tangentially communicated with the lower part of the separation chamber.

[0009] In one embodiment, the housing is a spherical housing.

[0010] In one embodiment, the separation chamber comprises:

[0011] A separation cylinder is disposed in the housing, the top of the separation cylinder is open and the bottom is closed, and a notch is provided on the upper end surface of the separation cylinder;

[0012] a sealing plate disposed on the top of the separation cylinder, wherein the projection of the sealing plate coincides with the projection of the separation cylinder on a plane perpendicular to the height direction; and

[0013] a baffle plate, disposed on the sealing plate, extending in a radial direction of the sealing plate, wherein a projection of the notch on a plane perpendicular to the height direction is located within a projection of the baffle plate;

[0014] Wherein, one end of the liquid inlet pipe is located outside the shell and the other end is tangentially connected to the separation cylinder.

[0015] In one embodiment, the separation device further comprises a weir plate disposed in the housing, wherein the weir plate is located above the separation chamber;

[0016] Wherein, the weir plate is provided with an oil collecting hole which passes through the weir plate in the height direction.

[0017] In one embodiment, the weir plate includes a plurality of bending sections and a plurality of transition sections, the plurality of bending sections and the plurality of transition sections are staggered in the length direction, the bending sections and the transition sections both extend in the width direction, and both ends of the bending sections are connected to adjacent transition sections respectively;

[0018] Wherein, the bending angle of the bending section faces the separation chamber, and the oil collecting hole is arranged on the bending section.

[0019] In one embodiment, the separation device further comprises a water collecting assembly disposed in the shell, the water collecting assembly being located below the separation chamber, wherein the water collecting assembly is connected to the water phase outlet pipe, and a water collecting hole is provided on the water collecting assembly.

[0020] In one embodiment, the water collection assembly comprises:

[0021] a water collection chamber, disposed at the bottom of the separation chamber; and

[0022] a plurality of water collecting pipes, one end of which is connected to the inner wall of the shell and the other end of which is connected to the water collecting chamber;

[0023] Wherein, one end of the water phase outlet pipe is located outside the shell and the other end is connected to the bottom of the water collection chamber, and the water collection hole is provided on the water collection pipe.

[0024] In one embodiment, the separation device further comprises:

[0025] a liquid outlet branch, one end of which is connected to the water phase outlet pipe and the other end of which is connected to the liquid inlet pipe;

[0026] a water pump, disposed on the liquid outlet branch; and

[0027] A valve is provided on the solid phase outlet pipe.

[0028] In one embodiment, the separation device further comprises:

[0029] a liquid level meter, disposed in the housing, for measuring the liquid level of the aqueous phase of the mixed liquid and generating a corresponding induced electrical signal; and

[0030] The controller can receive the induced electrical signal and control the water pump and the valve to operate according to the induced electrical signal so that the liquid level of the aqueous phase reaches a preset liquid level.

[0031] In a second aspect, an embodiment of the present invention provides a separation method, which is applied to the separation device as described above, comprising:

[0032] Injecting a mixed liquid into the separation chamber through the liquid inlet pipe, causing the mixed liquid to swirl upward along the separation chamber, and performing primary separation on the mixed liquid, wherein the mixed liquid includes an oil phase, an aqueous phase, and a solid phase;

[0033] discharging the mixed liquid after primary separation into the shell;

[0034] Based on the different densities of the oil phase, the water phase and the solid phase, the oil phase after primary separation is discharged through the oil phase outlet pipe, the water phase is discharged through the water phase outlet pipe, and the solid phase is discharged through the solid phase outlet pipe; wherein, the oil phase outlet pipe is located at the top of the shell, the solid phase outlet pipe is located at the bottom of the shell, and the water phase outlet pipe is located between the separation chamber and the solid phase outlet pipe.

[0035] Compared with the prior art, the advantages of the embodiments of the present invention are that a separation chamber is provided to perform primary separation on the mixed liquid, and the mixed liquid after the primary separation enters the shell for separation again, thereby forming a two-stage separation, which improves the separation effect and separation efficiency of the mixed liquid; by providing a liquid inlet pipe tangential to the separation chamber, the mixed liquid enters the separation chamber from the liquid inlet pipe and flows upward in the separation chamber in a swirling flow, and under the action of centrifugal force, the droplets of each phase in the mixed liquid fuse, thereby achieving primary separation of the oil phase, water phase, and solid phase in the mixed liquid; using the shell as a secondary separation chamber for the mixed liquid, based on the density difference of the oil phase, water phase, and solid phase in the mixed liquid, under the action of gravity, the oil phase floats to the upper layer of the shell and is discharged through the oil phase outlet pipe, the water phase accumulates in the lower layer of the shell and is discharged through the water phase outlet pipe, and the solid phase is deposited at the bottom of the shell and is discharged through the solid phase outlet pipe, thereby achieving underwater oil, water, and sand three-phase separation and separate discharge and lifting, and the structure of the separation device is simple, and there is no other structure outside the shell except the connecting pipe. Not only is the structure compact, the volume and weight of the separator are reduced, but also it is convenient for production and installation on the seabed. In addition, there are no moving parts inside the shell, which not only further reduces the weight of the separator, but also reduces the risk of failure and the need for repair and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Hereinafter, the present invention will be described in more detail based on embodiments with reference to the accompanying drawings.

[0037] Figure 1 is a front view of a separation device provided by one embodiment of the present invention;

[0038] Figure 2 yes Figure 1 A top view of the separation device provided in the embodiment;

[0039] Figure 3 yes Figure 1 A cross-sectional view of the separation device provided in the embodiment in the main viewing direction;

[0040] Figure 4 yes Figure 1 A side view of the separation chamber and water collection assembly provided in the embodiment;

[0041] Figure 5 is a flow chart of a separation method provided by another embodiment of the present invention.

[0042] Reference numerals:

[0043] 10. Shell; 110. Oil phase outlet pipe; 120. Liquid inlet pipe; 130. Water phase outlet pipe; 140. Solid phase outlet pipe; 150. Oil collecting chamber;

[0044] 20, weir plate; 210, bending section; 220, transition section;

[0045] 30, separation chamber; 310, separation cylinder; 320, sealing plate; 330, baffle; 340, notch; 350, fixing column;

[0046] 40. Water collection assembly; 410. Water collection chamber; 420. Water collection pipe. DETAILED DESCRIPTION

[0047] The present invention will be further described below with reference to the accompanying drawings.

[0048] With the rapid development of marine engineering technology and equipment, the exploration and development of marine oil and gas resources has expanded from shallow waters to deep seas. Currently, deep-sea oil and gas exploration and development mostly utilizes underwater production systems, which can complete processes such as oil-water separation, gas-liquid separation, and wastewater treatment on the seabed, reducing the workload on offshore platforms.

[0049] The underwater separator is the core equipment of the underwater production system. Existing underwater separators generally perform separation based on the principles of gravity separation and centrifugal separation. The gravity separator adopts a cylindrical plus elliptical wind head structure, but has problems with its large size and weight. The centrifugal separator has poor separation effect and is sensitive to changes in the flow rate and pressure of the incoming material, resulting in low recovery rate and insufficient reliability of the processing process.

[0050] like Figures 1-4 As shown, in order to solve the above technical problems, at least one embodiment of the present invention provides a separation device, including a shell 10, a separation chamber 30 and a liquid inlet pipe 120; an oil phase outlet pipe 110, a solid phase outlet pipe 140 and a water phase outlet pipe 130 are provided on the shell 10, and the oil phase outlet pipe 110 and the solid phase outlet pipe 140 are respectively located at the top and the bottom of the shell 10; the separation chamber 30 is arranged in the shell 10 and is connected to the shell 10, wherein the water phase outlet pipe 130 is located between the separation chamber 30 and the solid phase outlet pipe 140; the liquid inlet pipe 120 is penetrated in the shell 10, and one end of the liquid inlet pipe 120 is tangentially connected to the lower part of the separation chamber 30.

[0051] As can be seen from the above, by setting up the separation chamber 30, the mixed liquid is subjected to primary separation, and the mixed liquid after the primary separation enters the shell 10 for separation, thereby forming a two-stage separation, which improves the separation effect and separation efficiency of the mixed liquid; by setting up the liquid inlet pipe 120 tangential to the separation chamber 30, the mixed liquid enters the separation chamber 30 from the liquid inlet pipe 120 and flows upward in the separation chamber 30 in a swirling flow, and under the action of centrifugal force, the droplets of each phase in the mixed liquid fuse, thereby achieving the primary separation of the oil phase, water phase and solid phase in the mixed liquid; the shell 10 is used as the secondary separation of the mixed liquid Based on the density difference between the oil phase, water phase, and solid phase in the mixed liquid, the oil phase floats to the upper layer of the shell 10 under the action of gravity and is discharged through the oil phase outlet pipe 110. The water phase accumulates in the lower layer of the shell 10 and is discharged through the water phase outlet pipe 130. The solid phase is deposited at the bottom of the shell 10 and is discharged through the solid phase outlet pipe 140, thereby achieving underwater oil, water, and sand three-phase separation and separate discharge and lifting. The structure of the separation device is simple. The exterior of the shell 10 has no other structure except the connecting pipe. This not only makes the structure compact, reduces the volume and weight of the separator, but also facilitates production and installation on the seabed. In addition, there are no moving parts inside the shell 10, which not only further reduces the weight of the separator, but also reduces the risk of failure and the need for repair and maintenance.

[0052] It should be noted that the mixed liquid is a three-phase mixed liquid, which includes an aqueous phase, an oily phase and a solid phase, wherein the solid phase includes sand. The densities of the solid phase, aqueous phase and oily phase decrease in sequence, and stratification will occur in the shell 10 due to the density difference. The oily phase floats to the upper layer, the aqueous phase gathers in the lower layer, and the solid phase settles at the bottom. In order to match the distribution pattern of the oily phase, aqueous phase and solid phase, an oil phase outlet pipe and a solid phase outlet pipe are respectively provided at the top and bottom of the shell 10 so as to discharge the separated oil phase and solid phase respectively.

[0053] It should also be noted that the shell 10 is a high-strength steel shell with strong pressure-bearing capacity and can be used in deep water environments below 1,500 meters. Compared with the existing separators that can only improve the pressure resistance by thickening the wall thickness under high hydrostatic pressure underwater, resulting in the separator being too large and too heavy, the use of high-strength steel shell reduces the wall thickness, thereby reducing weight and volume, while improving the pressure-bearing capacity.

[0054] It should also be noted that flanges are provided on one end of the oil phase outlet pipe 110 , the water phase outlet pipe 130 , the solid phase outlet pipe 140 and the liquid inlet pipe 120 outside the shell 10 to facilitate connection with the pipes.

[0055] It should also be noted that the moving component is a sand removal component, including but not limited to a sand flusher, a sand removal nozzle, etc. Figures 1-4As shown, an embodiment of the present invention provides a separation device, including a shell 10, a separation chamber 30 and a liquid inlet pipe 120; an oil phase outlet pipe 110, a solid phase outlet pipe 140 and a water phase outlet pipe 130 are provided on the shell 10, and the oil phase outlet pipe 110 and the solid phase outlet pipe 140 are respectively located at the top and the bottom of the shell 10; the separation chamber 30 is arranged in the shell 10 and is connected to the shell 10, wherein the water phase outlet pipe 130 is located between the separation chamber 30 and the solid phase outlet pipe 140; the liquid inlet pipe 120 is provided in the shell 10, and one end of the liquid inlet pipe 120 is tangentially connected to the lower part of the separation chamber 30.

[0056] As can be seen from the above, by setting up the separation chamber 30, the mixed liquid is subjected to primary separation, and the mixed liquid after the primary separation enters the shell 10 for separation, thereby forming a two-stage separation, which improves the separation effect and separation efficiency of the mixed liquid; by setting up the liquid inlet pipe 120 tangential to the separation chamber 30, the mixed liquid enters the separation chamber 30 from the liquid inlet pipe 120 and flows upward in the separation chamber 30 in a swirling flow, and under the action of centrifugal force, the droplets of each phase in the mixed liquid fuse, thereby achieving the primary separation of the oil phase, water phase and solid phase in the mixed liquid; the shell 10 is used as the secondary separation of the mixed liquid Based on the density difference between the oil phase, water phase, and solid phase in the mixed liquid, the oil phase floats to the upper layer of the shell 10 under the action of gravity and is discharged through the oil phase outlet pipe 110. The water phase accumulates in the lower layer of the shell 10 and is discharged through the water phase outlet pipe 130. The solid phase is deposited at the bottom of the shell 10 and is discharged through the solid phase outlet pipe 140, thereby achieving underwater oil, water, and sand three-phase separation and separate discharge and lifting. The structure of the separation device is simple. The exterior of the shell 10 has no other structure except the connecting pipe. This not only makes the structure compact, reduces the volume and weight of the separator, but also facilitates production and installation on the seabed. In addition, there are no moving parts inside the shell 10, which not only further reduces the weight of the separator, but also reduces the risk of failure and the need for repair and maintenance.

[0057] It should be noted that the mixed liquid is a three-phase mixed liquid, which includes an aqueous phase, an oily phase and a solid phase, wherein the solid phase includes sand. The densities of the solid phase, aqueous phase and oily phase decrease in sequence, and stratification will occur in the shell 10 due to the density difference. The oily phase floats to the upper layer, the aqueous phase gathers in the lower layer, and the solid phase settles at the bottom. In order to match the distribution pattern of the oily phase, aqueous phase and solid phase, an oil phase outlet pipe and a solid phase outlet pipe are respectively provided at the top and bottom of the shell 10 so as to discharge the separated oil phase and solid phase respectively.

[0058] It should also be noted that the shell 10 is a high-strength steel shell with strong pressure-bearing capacity and can be used in deep water environments below 1,500 meters. Compared with the existing separators that can only improve the pressure resistance by thickening the wall thickness under high hydrostatic pressure underwater, resulting in the separator being too large and too heavy, the use of high-strength steel shell reduces the wall thickness, thereby reducing weight and volume, while improving the pressure-bearing capacity.

[0059] It should also be noted that flanges are provided on one end of the oil phase outlet pipe 110 , the water phase outlet pipe 130 , the solid phase outlet pipe 140 and the liquid inlet pipe 120 outside the shell 10 to facilitate connection with the pipes.

[0060] It should also be noted that the moving component is a sand removal component, including but not limited to a sand flusher and a sand removal nozzle.

[0061] In some embodiments, housing 10 is a spherical housing.

[0062] Compared with the existing horizontal separators, which require a large wall thickness to withstand high hydrostatic external pressure, resulting in an increase in the weight of the separator and difficulty in manufacturing, installation and maintenance, the present invention improves the pressure-bearing capacity by providing a spherical shell, has a compact structure, avoids large wall thickness, and thus further reduces the volume and mass of the separator; in addition, the solid phase outlet pipe 140 is provided at the bottom of the spherical shell, and the reduced diameter structure of the lower part of the spherical shell is utilized to allow the solid phase to accumulate at the bottom of the spherical shell, so that the solid phase only needs to be opened by the solid phase outlet pipe and discharged with the help of the flushing effect of the water phase. Compared with the existing horizontal separators in which the solid phase is dispersed and deposited, the solid phase is difficult to gather near the outlet, and a movable sand removal component needs to be provided to flush the solid phase to the outlet. The structure of the present invention is greatly simplified, which not only further reduces the volume and mass of the separator, but also facilitates production, manufacturing, installation and maintenance.

[0063] It should be noted that the spherical shell, that is, the shell 10 is in the shape of a sphere.

[0064] In some embodiments, the separation chamber 30 includes a separation cylinder 310, a sealing plate and a baffle 330. The separation cylinder 310 is arranged in the shell 10, the top of the separation cylinder 310 is open and the bottom is closed, and a notch 340 is provided on the upper end surface of the separation cylinder 310; the sealing plate is arranged on the top of the separation cylinder 310, and on the plane perpendicular to the height direction, the projection of the sealing plate coincides with the projection of the separation cylinder 310; the baffle 330 is arranged on the sealing plate, and the baffle 330 extends along the radial direction of the sealing plate, and on the plane perpendicular to the height direction, the projection of the notch 340 is located within the projection of the baffle 330; wherein, one end of the liquid inlet pipe 120 is located outside the shell 10 and the other end is tangentially connected to the separation cylinder 310.

[0065] By providing a notch 340 on the upper end surface of the separation barrel 310, the separation chamber 30 is connected to the shell 10, allowing the mixed liquid that has undergone primary separation in the separation chamber 30 to enter the shell 10, providing a structural foundation for subsequent separation. By providing a baffle 330, the flow direction of the mixed liquid is changed, allowing the mixed liquid to enter the shell 10 first, preventing the mixed liquid from flowing directly into the oil phase outlet pipe 110 under the action of centrifugal force and affecting the separation effect. By being provided on a plane perpendicular to the height direction, the projection of the notch 340 is located within the projection of the baffle 330, ensuring that the mixed liquid flowing out of the notch 340 collides with the baffle 330 and changes direction, and preventing the baffle 330 from being too small to cover the notch 340, causing the mixed liquid to directly enter the oil phase outlet pipe 110 and affect the separation effect.

[0066] It should be noted that the separation barrel 310 is centrally located within the housing 10 and has a cylindrical structure. The separation chamber 30 also includes a plurality of fixed columns 350, which are arranged at equal intervals around the separation barrel 310. One end of each fixed column 350 is connected to the outer wall of the separation barrel 310, and the other end is connected to the inner wall of the housing 10, thereby improving strength and stability. For example, the separation chamber 30 includes four fixed columns 350, which are arranged at equal intervals around the separation barrel 310.

[0067] It should also be noted that if Figure 3 、 Figure 4 As shown, the height direction is parallel to the Z direction, the length direction is parallel to the X direction, and the width direction is parallel to the Y direction.

[0068] In some embodiments, the separation device further includes a weir plate 20 disposed in the shell 10 , and the weir plate is located above the separation chamber 30 , wherein the weir plate 20 is provided with an oil collecting hole that passes through the weir plate 20 in the height direction.

[0069] The weir plate 20 is provided to form an oil collecting chamber 150 within the housing 10. The oil collecting chamber 150 is located above the separation chamber 30. The weir plate 20 blocks the mixed liquid, redirecting its flow and preventing it from flowing directly into the oil collecting chamber 150 after being processed through the notch 340, thereby further improving the separation effect. Furthermore, the weir plate 20 acts as a straightener, stabilizing the upper interface of the oil phase. When the height of the separated oil phase within the housing 10 exceeds that of the weir plate 20, the oil phase enters the oil collecting chamber 150 through the oil collecting holes and is discharged through the oil phase outlet pipe 110.

[0070] In some embodiments, the weir plate 20 includes a plurality of bending sections 210 and a plurality of transition sections 220, and the plurality of bending sections 210 and the plurality of transition sections 220 are staggered in the length direction. The bending sections 210 and the transition sections 220 both extend in the width direction, and the two ends of the bending sections 210 are respectively connected to adjacent transition sections 220; wherein, the bending angle of the bending section 210 faces the separation chamber 30, and the oil collecting hole is provided on the bending section 210.

[0071] The bent section 210 facilitates guiding the oil phase into the upper portion of the weir plate 20 , and the bending angle of the bent section 210 faces the separation chamber 30 , reducing the contact area with the oil phase and guiding the oil phase into the oil collecting chamber 150 .

[0072] It should be noted that an oil collecting hole is provided at the bending corner of the bending section 210 .

[0073] In some embodiments, the separation device includes a water collecting assembly 40 disposed in the shell 10, and the water collecting assembly 40 is located below the separation chamber 30, wherein the water collecting assembly 40 is connected to the water phase outlet pipe 130, and a water collecting hole is provided on the water collecting assembly.

[0074] In some embodiments, the water collection assembly 40 also includes a water collection chamber 410 and multiple water collection pipes 420; the water collection chamber 410 is arranged at the bottom of the separation chamber 30; one end of the multiple water collection pipes 420 is connected to the inner wall of the shell 10 and the other end is connected to the water collection chamber 410; wherein, one end of the water phase outlet pipe 130 is located outside the shell 10 and the other end is connected to the bottom of the water collection chamber 410, and the water collection hole is arranged on the water collection pipe 420.

[0075] The aqueous phase within the housing 10 enters the water collection chamber 410 through the water collection hole and is discharged through the water phase outlet pipe 130 connected to the water collection chamber 410, thereby achieving aqueous phase separation and discharge. The provision of multiple water collection pipes 420 not only serves to connect the water collection chamber 410 with the housing 10, but also improves the stability and strength of the water collection chamber 410. The provision of the water collection assembly 40 allows the aqueous phase to enter the water collection pipe 420 from the housing 10, changing the flow direction of the water and providing a rectifying effect, thereby allowing the aqueous phase to be discharged from the water phase outlet pipe 130 in a more regular and stable manner.

[0076] It should be noted that the water collection chamber 410 is a closed cylindrical structure and is coaxially arranged with the separation chamber 30. The number of water collection pipes 420 is set as needed, and multiple water collection pipes 420 are arranged at intervals in the circumferential direction around the water collection chamber 410. For example, the number of water collection pipes 420 is four, and the four water collection pipes 420 are arranged at intervals in the circumferential direction around the water collection chamber 410.

[0077] In some embodiments, the separation device also includes a liquid outlet branch, a water pump and a valve; one end of the liquid outlet branch is connected to the water phase outlet pipe 130 and the other end is connected to the liquid inlet pipe 120; the water pump is arranged on the liquid outlet branch; and the valve is arranged on the solid phase outlet pipe 140.

[0078] By setting up a liquid outlet branch, the separated aqueous phase can re-enter the shell 10 to participate in separation; by setting up a water pump, the separated aqueous phase is mixed with the unseparated mixed liquid.

[0079] It should be noted that before the mixed liquid enters the liquid inlet pipe 120, the mixed liquid can be chemically pretreated first; as needed, a coalescing filter can be set in the liquid inlet pipe 120 and the separation chamber 30 to further improve the separation effect, wherein the specific working principle and structure of the coalescing filter are both existing technologies; in addition, a pour point depressant can be injected into the liquid inlet pipe as needed to further improve the separation effect.

[0080] In some embodiments, the separation device also includes a liquid level meter and a controller; the liquid level meter is arranged in the shell 10, and the liquid level meter is used to measure the liquid level height of the aqueous phase of the mixed liquid in the shell 10 and generate a corresponding induced electrical signal; the controller can receive the induced electrical signal and control the operation of the water pump and valve according to the induced electrical signal to make the liquid level height of the aqueous phase reach a preset liquid level.

[0081] By setting a liquid level meter to monitor the interface liquid level of the oil phase and the water phase in the shell 10, the interface liquid level of the oil phase and the water phase is prevented from exceeding the preset liquid level, thereby further improving the separation effect of the oil phase; by setting a controller to automatically adjust the interface liquid level of the oil phase and the water phase, it is ensured that the interface liquid level of the oil phase and the water phase is always at the preset liquid level.

[0082] It should be noted that the preset liquid level is an interval value, and the preset liquid level includes a first liquid level threshold and a second preset threshold. The first liquid level threshold is less than the second preset threshold. When the liquid level of the aqueous phase is less than the first liquid level threshold, the controller controls the valve opening to decrease and / or controls the flow of the water pump to increase, so that the liquid level of the aqueous phase rises, thereby preventing the liquid level of the oil phase from being too low and unable to flow into the oil collecting hole; when the liquid level of the aqueous phase is greater than the second preset threshold, the controller controls the valve opening to increase and / or controls the flow of the water pump to decrease, so that the liquid level of the aqueous phase drops, thereby preventing the aqueous phase from crossing the oil collecting hole.

[0083] It should also be noted that the controller includes but is not limited to a PLC controller, which is electrically connected to the water pump, valve, and liquid level gauge respectively; the liquid level gauge includes but is not limited to a guided wave radar level gauge, which is a radar level gauge based on the time domain reflection principle (TDR). The electromagnetic pulse of the radar level gauge propagates at the speed of light along the steel cable or probe. When encountering the surface of the medium to be measured, part of the pulse of the radar level gauge is reflected to form an echo and returns to the pulse transmitting device along the same path. The distance between the transmitting device and the surface of the medium to be measured is proportional to the propagation time of the pulse therebetween. The liquid level height is obtained by calculation. The specific structure and working principle of the guided wave radar level gauge are all existing technologies and will not be repeated in this application.

[0084] It should also be noted that the user can set a preset liquid level as needed. The preset liquid level is located below the weir plate 20 and above the water collection assembly 40. When the liquid level of the aqueous phase is higher than the preset liquid level, the liquid level meter generates a corresponding induced electrical signal and transmits it to the controller. The controller controls the valve to open, and the aqueous phase is released through the solid phase outlet pipe 140 and the solid phase is discharged, thereby causing the liquid level of the aqueous phase to drop below the preset liquid level.

[0085] It should also be noted that the separation device also includes a water-solid interface meter disposed within housing 10. This meter is used to monitor the interface between the aqueous phase and the solid phase, that is, to monitor the height of the solid phase. Of course, the user can select the appropriate meter based on the specific operating conditions. For example, if the solid content in the mixed liquid is low, a water-solid interface meter is not necessary.

[0086] like Figure 5 As shown, at least one embodiment of the present invention further provides a separation method, which is applied to the separation device of any embodiment of the present invention, thereby having all the technical effects brought by the technical solutions of the above embodiments, and the separation method includes:

[0087] S101: injecting a mixed liquid into the separation chamber 30 through the liquid inlet pipe 120, causing the mixed liquid to swirl upward along the separation chamber 30, and performing primary separation on the mixed liquid, wherein the mixed liquid includes an oil phase, an aqueous phase, and a solid phase;

[0088] S102: Discharging the mixed liquid after primary separation into the housing 10;

[0089] S103: Based on the different densities of the oil phase, the water phase and the solid phase, the oil phase after primary separation is discharged through the oil phase outlet pipe 110, the water phase is discharged through the water phase outlet pipe 130, and the solid phase is discharged through the solid phase outlet pipe 140; wherein, the oil phase outlet pipe 110 is located at the top of the shell 10, the solid phase outlet pipe 140 is located at the bottom of the shell 10, and the water phase outlet pipe 130 is located between the separation chamber 30 and the solid phase outlet pipe 140.

[0090] While the present invention has been described with reference to preferred embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner, provided no structural conflicts exist. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A separation device, characterized in that: include: A shell, wherein the shell is provided with an oil phase outlet pipe, a solid phase outlet pipe and a water phase outlet pipe, wherein the oil phase outlet pipe and the solid phase outlet pipe are respectively located at the top and the bottom of the shell; a separation chamber disposed in the shell and in communication with the shell, wherein the water phase outlet pipe is located between the separation chamber and the solid phase outlet pipe; A liquid inlet pipe is provided in the shell, and one end of the liquid inlet pipe is tangentially communicated with the lower part of the separation chamber.

2. The separation device according to claim 1, characterized in that The shell is a spherical shell.

3. The separation device according to claim 1, characterized in that The separation chamber comprises: A separation cylinder is disposed in the housing, the top of the separation cylinder is open and the bottom is closed, and a notch is provided on the upper end surface of the separation cylinder; a sealing plate, disposed on the top of the separation cylinder, wherein the projection of the sealing plate coincides with the projection of the separation cylinder on a plane perpendicular to the height direction; and a baffle plate, arranged on the sealing plate, extending in a radial direction of the sealing plate, and wherein a projection of the notch on a plane perpendicular to the height direction is located within a projection of the baffle plate; Wherein, one end of the liquid inlet pipe is located outside the shell and the other end is tangentially connected to the separation cylinder.

4. The separation device according to claim 1, characterized in that The separation device further comprises a weir plate disposed in the housing, wherein the weir plate is located above the separation chamber; Wherein, the weir plate is provided with an oil collecting hole which passes through the weir plate in the height direction.

5. The separation device according to claim 4, characterized in that The weir plate includes a plurality of bending sections and a plurality of transition sections, wherein the plurality of bending sections and the plurality of transition sections are staggered in the length direction, the bending sections and the transition sections both extend in the width direction, and both ends of the bending sections are connected to adjacent transition sections respectively; Wherein, the bending angle of the bending section faces the separation chamber, and the oil collecting hole is arranged on the bending section.

6. The separation device according to claim 1, characterized in that The separation device further comprises a water collecting assembly disposed in the shell, the water collecting assembly being located below the separation chamber, wherein the water collecting assembly is communicated with the water phase outlet pipe, and a water collecting hole is provided on the water collecting assembly.

7. The separation device according to claim 6, characterized in that The water collection assembly comprises: a water collection chamber, disposed at the bottom of the separation chamber; and a plurality of water collecting pipes, one end of which is connected to the inner wall of the shell and the other end of which is connected to the water collecting chamber; Wherein, one end of the water phase outlet pipe is located outside the shell and the other end is connected to the bottom of the water collection chamber, and the water collection hole is provided on the water collection pipe.

8. The separation device according to any one of claims 1 to 7, characterized in that The separation device further comprises: a liquid outlet branch, one end of which is connected to the water phase outlet pipe and the other end of which is connected to the liquid inlet pipe; a water pump, disposed on the liquid outlet branch; and A valve is provided on the solid phase outlet pipe.

9. The separation device according to claim 8, characterized in that The separation device further comprises: a liquid level meter, disposed in the housing, for measuring the liquid level of the aqueous phase of the mixed liquid in the housing and generating a corresponding induced electrical signal; and The controller can receive the induced electrical signal and control the water pump and the valve to operate according to the induced electrical signal so that the liquid level of the aqueous phase reaches a preset liquid level.

10. A separation method, applied to the separation device according to any one of claims 1 to 9, characterized in that: include: Injecting a mixed liquid into the separation chamber through the liquid inlet pipe, causing the mixed liquid to swirl upward along the separation chamber, and performing primary separation on the mixed liquid, wherein the mixed liquid includes an oil phase, an aqueous phase, and a solid phase; discharging the mixed liquid after primary separation into the shell; Based on the different densities of the oil phase, the water phase and the solid phase, the oil phase after primary separation is discharged through the oil phase outlet pipe, the water phase is discharged through the water phase outlet pipe, and the solid phase is discharged through the solid phase outlet pipe; wherein, the oil phase outlet pipe is located at the top of the shell, the solid phase outlet pipe is located at the bottom of the shell, and the water phase outlet pipe is located between the separation chamber and the solid phase outlet pipe.

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