Multiphase flow mixing device

Abstract

The application provides a multiphase flow mixing device, which comprises a first tank body, a second tank body and a reversing mechanism; the reversing mechanism comprises a first power mechanism and a second power mechanism, and the first power mechanism and the second power mechanism are alternately switched when liquid is reversely flowed between the first tank body and the second tank body. The first power mechanism and the second power mechanism are alternately switched when liquid is reversely flowed between the first tank body and the second tank body, so that the first tank body and the second tank body alternately form a vacuum suction cavity and / or a compression discharge cavity. Compared with the prior art, the multiphase flow mixing device does not need to set an electromagnetic valve group or an electromagnetic reversing valve to switch the inlet and outlet flow directions of the power pump during the reversing process, and the controllability and stability of the multiphase flow mixing device can be significantly improved.

Description

Technical Field

[0001] This application relates to the field of fluid transport technology, specifically to a multiphase flow mixing and transport device. Background Technology

[0002] Crude oil products are mainly mixtures of oil, water, and gas, and also contain a small amount of sediment, making them a multiphase mixture. The traditional process for oil and gas extraction and transportation in oilfields involves first separating the oil, gas, and water, and then transporting them separately using oil pumps, water pumps, and compressors. This process has disadvantages such as complex procedures, high investment costs, and difficulties in operation and maintenance.

[0003] Multiphase flow mixing technology is a highly efficient and economical pumping technology that has emerged in recent years and represents a development trend in oilfield production and transportation technologies both domestically and internationally. Multiphase flow transportation places extremely high demands on equipment stability, requiring long-term stable operation. Chinese patent CN109114433A discloses a multiphase flow mixing device that uses a power pump in conjunction with a solenoid valve assembly or solenoid directional valve to drive liquid reciprocating circulation. During operation, the opening and closing of the solenoid valve assembly or solenoid directional valve is controlled to automatically switch the inlet and outlet flow directions of the power pump to achieve reversal and continuous transportation. Because the solenoid valve assembly or solenoid directional valve needs to withstand significant liquid hammer during the reversal process, high quality and control precision are required, leading to less than ideal operability and stability of the multiphase flow mixing device. Summary of the Invention

[0004] This application provides a multiphase flow mixing device that can solve the problem that existing multiphase flow mixing devices require the solenoid valve assembly or solenoid directional valve to withstand large liquid hammer during switching, and have high requirements for the quality and control accuracy of the solenoid valve assembly or solenoid directional valve, resulting in less than ideal operability and stability of the multiphase flow mixing device.

[0005] This application provides a multiphase flow mixing and conveying device, including a first tank, a second tank, and a reversing mechanism;

[0006] The reversing mechanism drives the liquid in the first tank and the second tank to reciprocate and circulate, so that the first tank and the second tank alternately form a vacuum suction chamber and / or a compression discharge chamber, so as to realize the continuous mixing and transportation of liquid, gas or gas-liquid mixture;

[0007] The reversing mechanism includes a first power mechanism and a second power mechanism, which alternately switch operation when the liquid flows in a different direction between the first tank and the second tank.

[0008] In one possible implementation of this application, the first power mechanism and the second power mechanism are independently and in parallel connected between the first tank and the second tank.

[0009] In one possible implementation of this application, the first power mechanism pumps the liquid located in the first tank to the second tank when it is running, and the second power mechanism pumps the liquid located in the second tank to the first tank when it is running.

[0010] In one possible implementation of this application, the first power mechanism includes a first power pump, a first pipeline, and a first control valve. The first pipeline connects the first tank, the second tank, and the first power pump. The first control valve is disposed on the first pipeline and is used to open or close the first pipeline.

[0011] In one possible implementation of this application, the second power mechanism includes a second power pump, a second pipeline, and a second control valve. The second pipeline connects the first tank, the second tank, and the second power pump. The second control valve is installed on the corresponding second pipeline and is used to open or close the second pipeline.

[0012] In one possible implementation of this application, the first pipeline is open, the second pipeline is closed, and the first power pump pumps liquid located in the first tank to the second tank; or

[0013] When the first pipeline is closed and the second pipeline is open, the second power pump pumps the liquid located in the second tank into the first tank.

[0014] In one possible implementation of this application, the first tank is provided with a first circulating liquid inlet and a first circulating liquid outlet, and the height difference between the first circulating liquid inlet and the first circulating liquid outlet is greater than zero.

[0015] The second tank is provided with a second circulating liquid inlet and a second circulating liquid outlet, and the height difference between the second circulating liquid inlet and the second circulating liquid outlet is greater than zero;

[0016] The inlet of the first pipeline is connected to the outlet of the first circulating liquid, and the outlet of the first pipeline is connected to the inlet of the second circulating liquid; the inlet of the second pipeline is connected to the outlet of the second circulating liquid, and the outlet of the second pipeline is connected to the inlet of the first circulating liquid.

[0017] In one possible implementation of this application, the number of the first control valves is one, and it is disposed between the first power pump and the second circulating liquid inlet;

[0018] The second control valve is one in number and is located between the second power pump and the first circulating liquid inlet.

[0019] In one possible implementation of this application, the first power pump and / or the second power pump are variable frequency pumps.

[0020] In one possible implementation of this application, the first control valve and the second control valve are pneumatic valves or electric valves.

[0021] In one possible implementation of this application, the multiphase flow mixing and conveying device further includes a control system and a liquid level sensor;

[0022] The liquid level sensor is used to collect the liquid level height in the first tank and the second tank;

[0023] The control system is communicatively connected to the liquid level sensor and the reversing mechanism, and controls the reversing mechanism to reverse direction.

[0024] In one possible implementation of this application, both the first tank and the second tank are provided with fluid inlets. The multiphase fluid mixing and transport device further includes an input structure, which includes an inlet manifold. The fluid inlets on the first tank and the second tank are respectively connected to the inlet manifold through inlet check valves.

[0025] In one possible implementation of this application, both the first tank and the second tank are provided with fluid outlets, and the multiphase fluid mixing and transport device further includes an output structure; the output structure includes an outlet manifold, and the fluid outlets on the first tank and the second tank are respectively connected to the outlet manifold through an outlet check valve.

[0026] This application provides a multiphase flow mixing and conveying device, including a first tank, a second tank, and a reversing mechanism. The reversing mechanism drives the liquid in the first tank and the second tank to reciprocate, causing the first tank and the second tank to alternately form a vacuum suction chamber and / or a compression discharge chamber, thereby achieving continuous mixing and conveying of liquid, gas, or gas-liquid mixtures. The reversing mechanism includes a first power mechanism and a second power mechanism, which alternately switch operation when the liquid flows between the first tank and the second tank. By setting a first power mechanism and a second power mechanism in the reversing mechanism, and having the first power mechanism and the second power mechanism alternately switch operation when the liquid flows between the first tank and the second tank, this application enables the first tank and the second tank to alternately form a vacuum suction chamber and / or a compression discharge chamber. Compared with existing multiphase flow mixing and conveying devices, this application eliminates the need for solenoid valve groups or solenoid reversing valves to switch the inlet and outlet flow directions of the power pump during the reversing process, significantly improving the operability and stability of the multiphase flow mixing and conveying device. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of one embodiment of the multiphase flow mixing and transport device provided in this application. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0032] Please see Figure 1 , Figure 1 This is a schematic diagram of one embodiment of the multiphase flow mixing and conveying device provided in this application. This application provides a multiphase flow mixing and conveying device, including a first tank 1, a second tank 2, and a reversing mechanism. The reversing mechanism drives the liquid in the first tank 1 and the second tank 2 to reciprocate, causing the first tank 1 and the second tank 2 to alternately form a vacuum suction chamber and / or a compression discharge chamber, thereby achieving continuous mixing and conveying of liquids, gases, or gas-liquid mixtures.

[0033] It should be noted that the volumes of the first tank 1 and the second tank 2 in this application can be set according to specific needs, and their volumes are relatively large, for example, the volumes of the first tank 1 and the second tank 2 are 20m³. 3 up to 40m 3 between.

[0034] Furthermore, the volume of the first tank 1 is equal to the volume of the second tank 2, which allows the multiphase flow mixing and conveying device to occupy a smaller area and have higher conveying efficiency.

[0035] When the multiphase flow mixing device of this application is in operation, a certain amount of liquid needs to be discharged into the first tank 1 and / or the second tank 2 in advance. One possible way is to fill the first tank 1 and the second tank 2 with liquid to discharge the air in the first tank 1 and the second tank 2, thereby preventing the oxygen in the air from reacting chemically with the natural gas and causing an explosion.

[0036] In this embodiment, the reversing mechanism includes a first power mechanism and a second power mechanism, which alternately switch operation when the liquid flows in reverse direction between the first tank 1 and the second tank 2. It should be noted that, in this embodiment, the reversing mechanism can, during operation, allow liquid located in the first tank 1 to flow into the second tank 2, or allow liquid located in the second tank 2 to flow into the first tank 1.

[0037] This application, by setting a first power mechanism and a second power mechanism in the reversing mechanism, allows the first power mechanism and the second power mechanism to alternately switch operation when the liquid flows between the first tank 1 and the second tank 2, thereby enabling the first tank and the second tank to alternately form a vacuum suction chamber and / or a compression discharge chamber. Compared with existing multiphase flow mixing devices, it does not require the setting of a solenoid valve group or a solenoid reversing valve to switch the inlet and outlet flow directions of the power pump during the reversing process, which can significantly improve the operability and stability of the multiphase flow mixing device.

[0038] Furthermore, when the first power mechanism is running, it pumps the liquid in the first tank 1 to the second tank 2, and when the second power mechanism is running, it pumps the liquid in the second tank 2 to the first tank 1. For example, when the first power mechanism is running and the second power mechanism is not running, the liquid flows from the first tank 1 to the second tank 2. When it is necessary to switch the flow direction of the liquid between the first tank 1 and the second tank 2, that is, to make the liquid flow from the second tank 2 to the first tank 1, switching the operation of the first power mechanism and the second power mechanism can realize the flow direction of the liquid between the first tank 1 and the second tank 2, that is, to make the first power mechanism stop running and make the second power mechanism run. This application only needs to switch the operating state of the first power mechanism and the second power mechanism to realize the switching of the flow direction of the liquid between the first tank 1 and the second tank 2, which is simple to operate and can significantly improve the operability and stability of the multiphase flow mixing and conveying device.

[0039] Specifically, the first power mechanism includes a first power pump 1-11, a first pipeline (not shown in the figure), and a first control valve 2-10. The first pipeline connects the first tank 1, the second tank 2, and the first power pump 1-11. The first control valve 2-10 is installed on the first pipeline and is used to open or close the first pipeline.

[0040] In other embodiments of this application, the first power mechanism may also include only the first power pump 1-11 and the first pipeline.

[0041] It is understandable that when the first power pump 1-11 is working, the first power pump 1-11 pumps the liquid in the first tank 1 to the second tank 2, the volume of the liquid in the first tank 1 decreases, thereby forming a vacuum suction chamber in the first tank 1; at the same time, as the liquid in the first tank 1 is pumped to the second tank 2, the volume of the liquid in the second tank 2 increases accordingly, thereby forming a compression discharge chamber in the second tank 2.

[0042] In other embodiments of this application, the first power mechanism may also be other mechanisms that can drive liquid to flow in a preset direction as disclosed in the prior art, and are not limited here.

[0043] Specifically, the second power mechanism includes a second power pump 2-11, a second pipeline (not shown in the figure), and a second control valve 1-10. The second pipeline connects the first tank 1, the second tank 2, and the second power pump 2-11. The second control valve 1-10 is installed on the second pipeline and is used to open or close the second pipeline.

[0044] In other embodiments of this application, the second power mechanism may also include only the second power pump 2-11 and the second pipeline.

[0045] It is understandable that when the second power pump 2-11 is working, the second power pump 2-11 pumps the liquid in the second tank 2 to the first tank 1, the volume of the liquid in the second tank 2 decreases, thereby forming a vacuum suction chamber in the second tank 2; at the same time, as the liquid in the second tank 2 is pumped to the first tank 1, the volume of the liquid in the first tank 1 increases accordingly, thereby forming a compression discharge chamber in the first tank 1.

[0046] In other embodiments of this application, the second power mechanism may also be other mechanisms that can drive liquid to flow in a preset direction as disclosed in the prior art, and are not limited here.

[0047] Further, the first control valve 2-10 is open, the first pipeline is connected, the second control valve 2-10 is closed, the second pipeline is closed, and the first power pump 1-11 pumps the liquid located in the first tank 1 to the second tank 2; or the first control valve 2-10 is closed, the first pipeline is closed, the second control valve 1-10 is open, the second pipeline is connected, and the second power pump 2-11 pumps the liquid located in the second tank 2 to the first tank 1. Further, the first power pump 1-11 pumps the liquid located in the first tank 1 to the second tank 2 at its rated speed.

[0048] Furthermore, the second power pump 2-11 pumps the liquid located in the second tank 2 to the first tank 1 at its rated speed.

[0049] Furthermore, the first power pump 1-11 switches between operating at its rated speed and between 5% and 30% of its rated speed. The second power pump 2-11 also switches between operating at its rated speed and between 5% and 30% of its rated speed. For example, when liquid flows from the first tank 1 into the second tank 2, the first power pump 1-11 operates at its rated speed, and the second power pump 2-11 operates between 5% and 30% of its rated speed. When the multiphase flow mixing device needs to reverse direction, i.e., when liquid flows from the second tank 2 into the first tank 1, the first power pump 1-11, which was originally operating at its rated speed, switches to operating between 5% and 30% of its rated speed, and the second power pump 2-11, which was originally operating between 5% and 30% of its rated speed, switches to operating at its rated speed.

[0050] It should be emphasized that the above settings can reduce the liquid hammer generated during the switching process of the multiphase flow mixing device, reduce the pressure difference between the first control valve 2-10 and the second control valve 1-10 during the switching process, improve the operability and stability of the first control valve 2-10 and the second control valve 1-10, and thus help improve the stability of the multiphase flow mixing device.

[0051] Furthermore, the switching time of the first power pump 1-11 between its rated speed and 5% to 30% of its rated speed is equal to the reversing time of the multiphase flow mixing device, which is beneficial to further improve the stability of the multiphase flow mixing device.

[0052] Furthermore, the switching time of the second power pump 2-11 between its rated speed and 5% to 30% of its rated speed is equal to the reversing time of the multiphase flow mixing device, which is beneficial to further improve the stability of the multiphase flow mixing device.

[0053] Furthermore, the first power pump 1-11 switches between operating at its rated speed and at 10% of its rated speed. The second power pump 2-11 also switches between operating at its rated speed and at 10% of its rated speed.

[0054] Furthermore, the first power pump 1-11 and the second power pump 2-11 are centrifugal pumps, which helps to further improve the stability of the multiphase flow mixing device.

[0055] Furthermore, the first power pump 1-11 and the second power pump 2-11 are variable frequency pumps. It is understood that by configuring the first power pump 1-11 and the second power pump 2-11 as variable frequency pumps, the liquid can be redirected between the first tank and the second tank by controlling the operating frequency of the first power pump 1-11 and the second power pump 2-11, further improving the operability of the multiphase flow mixing device during redirection; simultaneously, the pumping flow rate of the first power pump 1-11 and the second power pump 2-11 can be controlled, reducing liquid hammer generated during redirection, further improving the stability of the multiphase flow mixing device.

[0056] Furthermore, the first pipeline is open, the second pipeline is closed, the first power pump 1-11 operates at its rated power, and the second power pump 2-11 operates at low power, for example, 5% to 30% of its rated power. The first power pump 1-11 pumps the liquid located in the first tank 1 into the second tank 2.

[0057] Furthermore, the second pipeline is opened, the first pipeline is closed, the second power pump 2-11 operates at its rated power, and the first power pump 1-11 operates at low power, for example, 5% to 30% of its rated power. The second power pump 2-11 pumps the liquid located in the second tank 2 into the first tank 1.

[0058] Furthermore, the first power pump 1-11 and the second power pump 2-11 have the same rated power. The first power pump 1-11 operates at its rated power, and the second power pump 2-11 operates at 10% of its rated power. The first power pump 1-11 pumps the liquid located in the first tank 1 to the second tank 2, or the second power pump 2-11 operates at its rated power, and the first power pump 1-11 operates at 10% of its rated power. The second power pump 2-11 pumps the liquid located in the second tank 2 to the first tank 1.

[0059] In other embodiments of this application, the first pipeline is connected, the first power pump 1-11 operates at rated power or speed, the second power pump 2-11 is not operating, and the first power pump 1-11 pumps the liquid located in the first tank 1 to the second tank 2.

[0060] In other embodiments of this application, the second pipeline is connected, the second power pump 2-11 operates at rated power or speed, the first power pump 1-11 is not operating, and the second power pump 2-11 pumps the liquid located in the second tank 2 to the first tank 1.

[0061] In this embodiment, the first power mechanism and the second power mechanism are connected in parallel and independently between the first tank 1 and the second tank 2. That is, the first power mechanism connects the first tank 1 and the second tank 2, and the second power mechanism connects the first tank 1 and the second tank 2. The first power mechanism and the second power mechanism operate independently and do not affect each other.

[0062] Specifically, the first pipeline connects the first tank 1, the second tank 2, and the first power pump 1-11, and the first control valve 2-10 is installed on the first pipeline. The second pipeline connects the first tank 1, the second tank 2, and the second power pump 2-11, and the second control valve 1-10 is installed on the second pipeline. The first pipeline and the second pipeline are installed in parallel, and the first power pump 1-11 and the second power pump 2-11 operate independently.

[0063] In other embodiments of this application, the first power mechanism is connected to the first tank 1 and the second tank 2, the second power mechanism is connected to the first tank 1 and the second tank 2, and the connecting pipelines of the first power valve and the second power valve are connected together through a four-way valve, that is, the first pipeline and the second pipeline are connected through a four-way valve.

[0064] In some embodiments of this application, the first tank 1 has a first circulating liquid inlet and a first circulating liquid outlet on its side wall, and the height difference between the first circulating liquid inlet and the first circulating liquid outlet is greater than zero. That is, the first circulating liquid inlet is located above the first circulating liquid outlet, which helps to reduce the resistance during liquid inflow and makes liquid outflow more convenient. Similarly, it can be understood that the second tank 2 has a second circulating liquid inlet and a second circulating liquid outlet on its upper part, and the height difference between the second circulating liquid inlet and the first circulating liquid outlet is greater than zero.

[0065] In some embodiments of this application, maintenance valves 1-2 and 2-1 are provided on the first pipeline. Maintenance valve 1-2 is located at the outlet of the first circulating liquid, and maintenance valve 2-1 is located at the inlet of the second circulating liquid. Maintenance valves 1-1 and 2-2 are provided on the second pipeline. Maintenance valve 1-1 is located at the inlet of the first circulating liquid, and maintenance valve 2-2 is located at the outlet of the second circulating liquid. Maintenance valves 1-2, 2-1, 1-1, and 2-2 are mainly used to close the first and second pipelines during maintenance. During device operation, the maintenance valves are normally open.

[0066] Specifically, the inlet of the first pipeline is connected to the first circulating liquid outlet, and the outlet of the first pipeline is connected to the second circulating liquid inlet. Liquid in the first tank 1 enters the second tank 2 via the first circulating liquid outlet, the first pipeline inlet, maintenance valve 1-2, the first power pump 1-11, the first control valve 2-10, maintenance valve 2-1, the first pipeline outlet, and the second circulating liquid inlet. The inlet of the second pipeline is connected to the second circulating liquid outlet, and the outlet of the second pipeline is connected to the first circulating liquid inlet. Liquid in the second tank 2 enters the first tank 1 via the second circulating liquid outlet, the second pipeline inlet, maintenance valve 2-2, the second power pump 2-11, the second control valve 1-10, maintenance valve 1-1, the second pipeline outlet, and the first circulating liquid inlet.

[0067] In this embodiment, there is one first control valve 2-10, which is located between the first power pump 1-11 and the second circulating liquid inlet; there is one second control valve 1-10, which is located between the second power pump 2-11 and the first circulating liquid inlet.

[0068] It is understood that the first control valve 2-10 and the second control valve 1-10 can be pneumatic valves or electric valves, or other valves that can open and close pipelines, without any restrictions.

[0069] In some embodiments of this application, the multiphase flow mixing and conveying device further includes a control system 3. The first tank 1 is equipped with a first liquid level sensor 1-7, and the second tank 2 is equipped with a second liquid level sensor 2-7. The first liquid level sensor 1-7 and the second liquid level sensor 2-7 collect the liquid level heights in the first tank 1 and the second tank 2, respectively. The control system 3 is communicatively connected to the first liquid level sensor 1-7, the second liquid level sensor 2-7, and the reversing mechanism, and controls the reversing mechanism to reverse direction.

[0070] It is understandable that including a control system 3 and a level sensor 1-7 and a second level sensor 2-7 in the multiphase flow mixing device is beneficial to improving the automation level of the multiphase flow mixing device. Of course, in some other embodiments of this application, the multiphase flow mixing device may also include a pressure sensor (not shown in the figure), which collects the pressure values ​​in the first tank 1 and the second tank 2, which is beneficial to improving the safety of the multiphase flow mixing device.

[0071] Specifically, the control system 3 is connected to the first power pump 1-11, the second power pump 2-11, the first control valve 2-10, and the second control valve 1-10 via control lines. By controlling the opening or closing of the first and second control valves 2-10, the system controls the connection or closure of the first tank 1 and the second tank 2. Similarly, by controlling the opening and closing of the first and second power pumps 1-11, the system controls whether liquid in the first tank 1 is pumped to the second tank 2 or vice versa. For example, when the first level sensor 1-7 detects that the liquid level in the first tank 1 has reached the top dead center (top of the tank), the first level sensor 1-7 transmits a level signal to the control system 3. Based on the level signal, the control system 3 issues a control command to open the first control valve 2-10 and the first power pump 1-11. Under the action of the first power pump 1-11, the liquid in the first tank 1 is discharged into the second tank.

[0072] At this time, in the multiphase flow mixing device, the first tank 1 is in the suction state, and the second tank 2 is in the discharge state. Under the negative pressure at the inlet of the first power pump 1-11, the liquid level in the first tank 1 begins to drop, and a vacuum is formed at the top of the first tank 1. Under the positive pressure at the outlet of the first power pump 1-11, the liquid level in the second tank 2 rises. When the liquid level in the first tank 1 drops to the lower dead center position (at the outlet of the first circulating liquid), the first liquid level sensor 1-7 transmits the liquid level signal to the control system 3. The control system 3 issues a control command based on the liquid level signal to open the second control valve 1-10 and start the second power pump 2-11. The liquid in the second tank 2 is discharged into the first tank 1 under the action of the second power pump 2-11.

[0073] At this time, in the multiphase flow mixing and conveying device, the first tank 1 is in the discharge state, and the second tank 2 is in the suction state. Under the action of the negative pressure at the inlet of the second power pump 2-11, the liquid level in the second tank 2 begins to drop, and a vacuum is formed in the upper part of the second tank 2. Under the action of the positive pressure at the outlet of the second power pump 2-11, the liquid level in the first tank 1 rises until the liquid level in the second tank 2 begins to drop to the lower dead center position (the outlet of the second circulating liquid) and the next reversal begins. This process is repeated to achieve continuous mixing and conveying of liquids, gases, or gas-liquid mixtures.

[0074] In some embodiments of this application, both the first tank 1 and the second tank 2 are provided with fluid inlets and fluid outlets. Further, the multiphase fluid mixing and transport device also includes an input structure and an output structure. The input structure includes an inlet manifold 4, and the fluid inlets on the first tank 1 and the second tank 2 are respectively connected to the inlet manifold 4 via a first inlet check valve 1-5 and a second inlet check valve 2-5. The output structure includes an outlet manifold 5, and the fluid outlets on the first tank 1 and the second tank 2 are respectively connected to the outlet manifold 5 via a first outlet check valve 1-6 and a second outlet check valve 2-6. Of course, in other embodiments of this application, only one opening may be provided at the upper part of the first tank 1 and the upper part of the second tank 2 for fluid to flow into or out of the corresponding tank, and connected to the input structure and the output structure respectively via a one-way or two-way valve; this is not limited here.

[0075] In other embodiments of this application, the input structure is provided with maintenance valve 1-3 and maintenance valve 2-3, wherein maintenance valve 1-3 is located at the fluid inlet of the first tank and maintenance valve 2-3 is located at the fluid inlet of the second tank. The output structure is provided with maintenance valve 1-4 and maintenance valve 2-4, wherein maintenance valve 1-4 is located at the fluid outlet of the first tank and maintenance valve 2-4 is located at the fluid outlet of the second tank. Maintenance valves 1-3, 2-3, 1-4, and 2-4 are mainly used to close the input and output structures during maintenance; during device operation, the maintenance valves are normally open.

[0076] It is understood that when the first tank 1 forms a vacuum suction chamber and the second tank 2 forms a pressure discharge chamber, the first inlet check valve 1-5 between the fluid inlet and the inlet manifold 4 is opened, the first outlet check valve 1-6 between the fluid outlet and the outlet manifold 5 is closed, the second outlet check valve 2-6 between the fluid outlet and the outlet manifold 5 is opened, and the second inlet check valve 2-5 between the fluid inlet and the inlet manifold 4 is closed.

[0077] At this time, the fluid in the inlet manifold 4 is drawn into the first tank 1. After entering the first tank 1, the liquid and gas separate, with the gas accumulating at the top of the first tank 1 and the liquid moving downwards with the liquid level. The liquid level in the second tank 2 rises, and the compressed gas or liquid in the second tank 2 is discharged into the outlet manifold 5 through the maintenance valve 2-4 and the second outlet check valve 2-6 under the action of the first power pump 1-11. When the second tank 2 forms a vacuum suction chamber and the first tank 1 forms a compression discharge chamber, the first inlet check valve 1-5 between the fluid inlet and the inlet manifold 4 is closed, the first outlet check valve 1-6 between the fluid outlet and the outlet manifold 5 is open, the second outlet check valve 2-6 between the fluid outlet and the outlet manifold 5 is closed, and the second inlet check valve 2-5 between the fluid inlet and the inlet manifold 4 is open.

[0078] At this time, the fluid in the inlet manifold 4 is drawn into the second tank 2. After the fluid is in the second tank 2, the liquid and gas are separated. The gas gathers at the top of the second tank 2, and the liquid moves downward with the liquid surface. The liquid level in the first tank 1 rises. The compressed gas or liquid in the first tank 1 is discharged into the outlet manifold 5 through the maintenance valve 1-4 and the first outlet check valve 1-6 under the action of the second power pump 2-11.

[0079] In some embodiments of this application, the inlet manifold 4 and the outlet manifold 5 are connected by a maintenance valve 6. When the multiphase flow mixing device malfunctions, the maintenance valve 6 is opened and maintenance valves 1-3, 1-4, 2-3 and 2-4 are closed, and the mixed fluid can be discharged directly through the outlet manifold 5.

[0080] In some embodiments of this application, the first tank 1 and the second tank 2 are respectively provided with a first exhaust valve 1-9 and a second exhaust valve 2-9. The first exhaust valve 1-9 and the second exhaust valve 2-9 are located at the upper part of the first tank 1 and the second tank 2, and are used to discharge gas inside the tank. The first tank 1 and the second tank 2 are also respectively provided with a first drain valve 1-8 and a second drain valve 2-8. The first drain valve 1-8 and the second drain valve 2-8 are located at the lower part of the first tank 1 and the second tank 2, and are used to discharge liquid inside the tank.

[0081] The multiphase flow mixing and conveying device provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A multiphase flow mixing and conveying device, characterized in that, It includes a first tank, a second tank, and a reversing mechanism; The reversing mechanism drives the liquid in the first tank and the second tank to reciprocate and circulate, so that the first tank and the second tank alternately form a vacuum suction chamber and / or a compression discharge chamber, so as to realize the continuous mixing and transportation of liquid, gas or gas-liquid mixture; The reversing mechanism includes a first power mechanism and a second power mechanism, which alternately switch operation when the liquid flows in a different direction between the first tank and the second tank. The first power mechanism includes a first power pump, and the second power mechanism includes a second power pump. The first power pump operates at a rated speed; the second power pump operates between 5% and 30% of the rated speed; or, the first power pump operates between 5% and 30% of the rated speed, and the second power pump operates at the rated speed. The multiphase flow mixing and conveying device further includes a control system. The first tank is equipped with a first liquid level sensor, which collects the liquid level signal of the first tank. The second tank is equipped with a second liquid level sensor, which collects the liquid level signal of the second tank. The control system is communicatively connected to the first liquid level sensor, the second liquid level sensor, and the reversing mechanism. The first liquid level sensor and the second liquid level sensor transmit the liquid level signal to the control system. The control system controls the reversing mechanism to reverse according to the liquid level signal. The switching time of the first power pump between its rated speed and 5% to 30% of its rated speed is equal to the reversing time of the multiphase flow mixing and conveying device, or the switching time of the second power pump between its rated speed and 5% to 30% of its rated speed is equal to the reversing time of the multiphase flow mixing and conveying device.

2. The multiphase flow mixing and conveying device as described in claim 1, characterized in that, The first power mechanism and the second power mechanism are independently and in parallel connected between the first tank and the second tank.

3. The multiphase flow mixing and conveying device as described in claim 1, characterized in that, When the first power mechanism is in operation, it pumps the liquid located in the first tank into the second tank, and when the second power mechanism is in operation, it pumps the liquid located in the second tank into the first tank.

4. The multiphase flow mixing and conveying device as described in claim 3, characterized in that, The first power mechanism further includes a first pipeline and a first control valve. The first pipeline connects the first tank, the second tank, and the first power pump. The first control valve is installed on the first pipeline and is used to open or close the first pipeline.

5. The multiphase flow mixing and conveying device as described in claim 4, characterized in that, The second power mechanism also includes a second pipeline and a second control valve. The second pipeline connects the first tank, the second tank and the second power pump. The second control valve is installed on the corresponding second pipeline and is used to open or close the second pipeline.

6. The multiphase flow mixing and conveying device as described in claim 5, characterized in that, When the first pipeline is open and the second pipeline is closed, the first power pump pumps the liquid located in the first tank to the second tank; or When the first pipeline is closed and the second pipeline is open, the second power pump pumps the liquid located in the second tank into the first tank.

7. The multiphase flow mixing and conveying device as described in claim 5, characterized in that, The first tank is provided with a first circulating liquid inlet and a first circulating liquid outlet, and the height difference between the first circulating liquid inlet and the first circulating liquid outlet is greater than zero; The second tank is provided with a second circulating liquid inlet and a second circulating liquid outlet, and the height difference between the second circulating liquid inlet and the second circulating liquid outlet is greater than zero; The inlet of the first pipeline is connected to the outlet of the first circulating liquid, and the outlet of the first pipeline is connected to the inlet of the second circulating liquid; the inlet of the second pipeline is connected to the outlet of the second circulating liquid, and the outlet of the second pipeline is connected to the inlet of the first circulating liquid.

8. The multiphase flow mixing and conveying device as described in claim 7, characterized in that, The number of the first control valve is one, and it is located between the first power pump and the second circulating liquid inlet; The second control valve is one in number and is located between the second power pump and the first circulating liquid inlet.

9. The multiphase flow mixing and conveying device as described in claim 5, characterized in that, The first power pump and / or the second power pump are variable frequency pumps.

10. The multiphase flow mixing and conveying device as described in claim 5, characterized in that, The first control valve and the second control valve are pneumatic valves or electric valves.

11. The multiphase flow mixing and conveying device according to any one of claims 1 to 10, characterized in that, Both the first tank and the second tank are provided with fluid inlets. The multiphase flow mixing and conveying device also includes an input structure, which includes an inlet manifold. The fluid inlets on the first tank and the second tank are respectively connected to the inlet manifold through inlet check valves.

12. The multiphase flow mixing and conveying device according to any one of claims 1 to 10, characterized in that, Both the first tank and the second tank are provided with fluid outlets, and the multiphase flow mixing and conveying device also includes an output structure; the output structure includes an outlet manifold, and the fluid outlets on the first tank and the second tank are respectively connected to the outlet manifold through an outlet check valve.

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