Multiphase flow mass flow meter and multiphase flow mass flow acquisition method

Abstract

The invention discloses a multiphase flow mass flow meter and a multiphase flow mass flow obtaining method. The mass flow meter comprises a flow dividing pipe and a measuring pipe which are connected. A flow dividing assembly is fixedly arranged in the flow dividing pipe. The shunting assembly is provided with a plurality of spinning discs around the central axis of the shunting pipe; the included angle between the plurality of spinning disks and the axial direction of the shunt pipe is 45 degrees; and a plurality of pressure sensors are arranged on the measuring pipe and are used for acquiring the radial pressure difference or the axial pressure difference of the multiphase fluid shunted by the shunting assembly. The flowmeter has the advantages of being simple in structure, high in measurement precision, good in real-time performance, wide in application range and the like, and is important equipment in the field of industrial process monitoring and flow control.

Description

Technical Field

[0001] The invention belongs to the technical field of multiphase flow measurement, and relates to a multiphase flow mass flowmeter and a method for obtaining the mass flow of a multiphase flow. Background Art

[0002] Multiphase flow is a complex fluid phenomenon, which refers to the coexistence of two or more substances of different phases or different components in the same space, and there is a clear boundary between these substances. This flow phenomenon is widely present in nature and industrial processes, such as oil and gas extraction, chemical production, nuclear power generation, and environmental engineering. Common types of multiphase flow include gas-liquid two-phase flow, gas-solid two-phase flow, and oil-gas-water multiphase flow. The flow pattern of multiphase flow is complex and changeable, and its flow characteristics are affected by many factors. The interaction between different flow phases is strong, and there is a phase change phenomenon, that is, one phase may change into another phase. In addition, the critical value of the change of physical properties of multiphase flow is difficult to accurately estimate, and the laws of heat and mass transfer are also difficult to grasp. These factors make the flow measurement of multiphase flow extremely difficult.

[0003] In order to accurately measure the flow rate of multiphase flow, three detection modes are mainly used at this stage: separation detection, partial separation detection and non-separation detection. The separation detection method is to separate the multiphase flow and then detect the separated single-phase fluid. The measurement accuracy of this method mainly depends on the separation efficiency. If the separation effect of each phase is poor, accurate measurement results cannot be obtained. Partial separation detection is to separate the easily separated phase first, and then mix the remaining phases for detection. This method improves the measurement accuracy to a certain extent, but it is still affected by the separation effect. Non-separation detection directly detects the multiphase flow without separation processing. However, this method is not suitable for all flow phases, and the measurement accuracy is also limited by many factors.

[0004] In industrial processes, multiphase flow rate is one of the most important detection and control parameters. Especially in industries such as oil and gas extraction, the real-time flow rate of a phase in a multiphase flow is crucial for industrial process monitoring. Therefore, improving the accuracy of multiphase flow measurement systems and broadening their scope of application are the main challenges and research directions faced by the current development of multiphase flow measurement and control systems. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a multiphase flow mass flowmeter and a method for obtaining the mass flow rate of multiphase flow, thereby solving the technical problem that the prior art cannot achieve sufficient separation of the multiphase flow, resulting in low accuracy of the obtained mass flow rate of the multiphase flow.

[0006] Technical issues in accurately measuring multiphase flow rate.

[0007] The present invention is achieved through the following technical solutions: A multiphase mass flow meter, comprising a shunt pipe and a measuring pipe connected and arranged; A flow dividing assembly is fixedly arranged inside the flow dividing pipe; the flow dividing assembly is provided with a plurality of swirl plates around the central axis of the flow dividing pipe; the angle between the plurality of swirl plates and the axial direction of the flow dividing pipe is 45°; The measuring tube is provided with a plurality of pressure sensors for obtaining the radial pressure difference or axial pressure difference of the multiphase fluid after being diverted by the diverting component.

[0008] Preferably, the flow diversion assembly includes four swirl plates; the four swirl plates are evenly distributed around the central axis of the flow diversion pipe.

[0009] Preferably, the shunt pipe and the measuring pipe are connected via a flange.

[0010] Preferably, the measuring tube comprises a front straight pipe section, a contraction section, a throat section, an expansion section and a rear straight pipe section which are sequentially connected; Preferably, a first pressure sensor and a second pressure sensor are arranged opposite to each other along the circumference of the front straight pipe section, and the first pressure sensor and the second pressure sensor are used to obtain the radial pressure difference of the multiphase flow; a third pressure sensor is arranged on the throat section; a fourth pressure sensor is arranged on the rear straight pipe section; the third pressure sensor and the fourth pressure sensor are used to obtain the axial pressure difference of the multiphase flow.

[0011] Preferably, the vertical distance between the first pressure sensor and the second pressure sensor and the inlet of the contraction section is consistent with the inner diameter of the inlet of the contraction section.

[0012] Preferably, the diameter of the throat section is half of the diameter of the inlet of the contraction section; and the vertical distance between the third pressure sensor and the inlet of the throat section is also half of the diameter of the inlet of the contraction section.

[0013] Preferably, the vertical distance between the fourth pressure sensor and the inlet of the straight pipe section is 2.5 to 3 times the inner diameter of the straight pipe section.

[0014] Preferably, the contraction section is a frustum structure with a cone angle of 21°.

[0015] Preferably, the expansion section is a frustum structure with a cone angle of 15°.

[0016] A method for obtaining the mass flow rate of a multiphase flow is obtained by the above-mentioned multiphase flow mass flowmeter, and includes: obtaining the radial pressure difference or axial pressure difference of the multiphase fluid after being diverted by a diversion component, and obtaining the mass flow rate of the multiphase flow through the radial pressure difference or axial pressure difference and a preset mass flow model.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention discloses a multiphase mass flow meter, which provides a shunt component, and the shunt component is provided with a plurality of swirl plates around the central axis of the shunt tube; the angle between the plurality of swirl plates and the axial direction of the shunt tube is 45°, so the axial velocity and the tangential velocity are equal, that is, the fluid rotates at the same speed while flowing along the axial direction, which can achieve uniform mixing of the fluid and efficient energy transfer, make the separation of each phase more thorough, effectively improve the separation effect of the multiphase fluid, lay the foundation for the accuracy of subsequent data, and achieve accurate acquisition of the multiphase mass flow rate.

[0018] Furthermore, the diversion component includes four swirl plates; the four swirl plates are evenly distributed around the central axis of the diversion tube. Under the action of the swirl of the mixed fluid, the centrifugal force inside the fluid will cause solid particles or heavier substances to settle outward, while relatively light substances will gather toward the center, thereby effectively separating the multiphase flow.

[0019] Furthermore, the shunt pipe and the measuring pipe are connected by a flange, which can make the connection between the shunt pipe and the measuring pipe reliable and have good sealing performance. At the same time, the flange connection is easy to disassemble, which is conducive to the inspection, maintenance and care of the cyclone.

[0020] Furthermore, the measuring tube includes a front straight pipe section, a contraction section, a throat section, an expansion section and a rear straight pipe section which are sequentially connected. These five sections together ensure accurate measurement and stable operation of the flowmeter and cooperate with each other to achieve high-precision flow measurement.

[0021] Furthermore, a first pressure sensor and a second pressure sensor are arranged opposite to each other along the circumference of the front straight pipe section, and the first pressure sensor and the second pressure sensor are used to obtain the radial pressure difference of the multiphase flow; a third pressure sensor is arranged on the throat section; a fourth pressure sensor is arranged on the rear straight pipe section; the third pressure sensor and the fourth pressure sensor are used to obtain the axial pressure difference of the multiphase flow. The setting of multiple pressure sensors can provide redundant measurement. When a sensor fails, other sensors can continue to provide measurement data, which helps to ensure the stability and reliability of the measurement system and reduce measurement errors caused by sensor failure.

[0022] Furthermore, the vertical distance between the first pressure sensor and the second pressure sensor and the inlet of the contraction section is consistent with the inner diameter of the inlet of the contraction section, accurately measuring the pressure of the fluid before entering the contraction section and providing a stable reference value for differential pressure measurement.

[0023] Furthermore, the diameter of the throat section is half of the diameter of the inlet of the contraction section; the vertical distance between the third pressure sensor and the inlet of the throat section is also half of the diameter of the inlet of the contraction section, which can capture the lowest pressure of the fluid when passing through the throat, which is the key value of differential pressure measurement.

[0024] Furthermore, the vertical distance between the fourth pressure sensor and the inlet of the straight pipe section is 2.5 to 3 times the inner diameter of the straight pipe section, which can reflect the pressure state of the fluid after full development and help verify the accuracy of the differential pressure measurement.

[0025] Furthermore, the contraction section is a truncated cone structure with a cone angle of 21°, which can produce less pressure loss when the multiphase flow passes through, helping to reduce energy consumption and improve the overall efficiency of the system. At the same time, smaller pressure loss also means that the flow meter has less interference with the fluid flow, which is conducive to maintaining the natural flow state of the fluid.

[0026] Furthermore, the expansion section is a frustum structure with a cone angle of 15°, which allows the fluid to flow out of the Venturi tube more smoothly, thereby improving the accuracy and stability of fluid measurement, while enabling it to adapt to a wider variety of fluids and working conditions, improving its breadth and flexibility of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a front view of a multiphase mass flowmeter in the present invention; Figure 2 is a cross-sectional view of the flow diversion component in the present invention; Figure 3 It is a front view of the diversion component in the present invention; Figure 4 It is a schematic flow chart of a method for obtaining mass flow of a multiphase flow according to the present invention; Figure 5 It is a schematic diagram of the flow diversion component for the oil-water two-phase flow diversion in the present invention; Figure 6 It is a structural schematic diagram of a multiphase flow mass flow acquisition system of the present invention.

[0029] Wherein: 1. shunt pipe, 2. measuring pipe, 21. front straight pipe section, 22. contraction section, 23. throat section, 24. expansion section, 25. rear straight pipe section, 3. shunt assembly, 31. swirl plate, 41. first pressure sensor, 42. second pressure sensor, 43. third pressure sensor, 44. fourth pressure sensor. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings: like Figure 1 As shown, the present invention discloses a multiphase mass flow meter, comprising a shunt tube 1 and a measuring tube 2 which are connected and arranged; a shunt assembly 3 is fixedly arranged inside the shunt tube 1, and the shunt assembly 3 is provided with four swirl plates 31 around the central axis of the shunt tube 1; the angle between the swirl plates 31 and the axial direction of the shunt tube 1 is 45°, and the shunt assembly 3 realizes effective separation of multiphase flow; after the multiphase flow fluid passes through the shunt assembly 3, due to the centrifugal force of the shunt assembly 3, when flowing out of the shunt tube 1, each phase will occupy an independent space with a clear interface.

[0037] The measuring tube 2 is provided with a plurality of pressure sensors for obtaining the radial pressure difference or axial pressure difference of the multiphase fluid after being diverted by the diverting component 3. The mass flow rate of the multiphase fluid can be obtained through the radial pressure difference or axial pressure difference.

[0038] The angle between the swirl plate 31 and the axial direction of the diverter pipe 1 is 45°, so the axial velocity and the tangential velocity are equal, that is, the fluid rotates at the same speed while flowing along the axial direction. It can achieve uniform mixing of the fluid and efficient energy transfer, making the separation of each phase more thorough.

[0039] In a preferred embodiment, the measuring tube 2 includes a front straight pipe section 21, a contraction section 22, a throat section 23, an expansion section 24 and a rear straight pipe section 25 which are sequentially connected; a first pressure sensor 41 and a second pressure sensor 42 are oppositely arranged along the circumference of the front straight pipe section 21; a third pressure sensor 43 is arranged on the throat section 23; and a fourth pressure sensor 44 is arranged on the rear straight pipe section 25.

[0040] The above-mentioned pressure sensor arrangement effectively realizes the acquisition of the pressure at the corresponding position, which is convenient for acquiring the mass flow rate of the multiphase flow. Specifically, the first pressure sensor 41 and the second pressure sensor 42 are used to realize the radial pressure difference of the multiphase flow. The third pressure sensor 43 and the fourth pressure sensor 44 are used to realize the axial pressure difference of the multiphase flow. Through detection, the corresponding relationship between radial and axial pressure differences and mass flow rate is established to realize online flow measurement and reduce measurement errors.

[0041] The front straight pipe section of the measuring tube 2 mentioned above serves as the initial channel for the fluid to enter the measuring tube, ensuring that the fluid can smoothly enter the subsequent contraction section. The contraction section accelerates the fluid so that the fluid velocity reaches the maximum value at the throat. By reducing the cross-sectional area of ​​the pipeline, the fluid forms a low-pressure area at the throat, laying the foundation for the subsequent pressure difference measurement. The throat section is the area where the fluid velocity reaches the maximum. At this time, the static pressure of the fluid is the lowest, providing a clear measurement point for the pressure sensor to detect the low-pressure state of the fluid. After passing through the throat section and entering the expansion section, the fluid gradually decelerates, reducing the turbulence and reducing the loss of fluid kinetic energy. The fluid can smoothly transition to the normal cross-section of the pipeline through the diffusion section, reducing the impact on the downstream of the pipeline. The front straight pipe section of the measuring tube has radially opposite pressure sensors, and the throat section and the rear straight pipe section of the measuring tube have pressure sensors in sequence, a total of four pressure sensors. The radially opposite pressure sensors of the front straight pipe section realize radial pressure detection of multiphase flow. The pressure sensors of the throat section and the rear straight pipe section and the pressure sensor of the front straight pipe section together establish the corresponding relationship between the radial pressure difference, axial pressure difference and fluid mass flow rate of the flow phase.

[0042] The measuring tube 2 mentioned above can be a Venturi tube. The Venturi tube is a throttling flow sensor developed based on the Venturi effect, that is, the flow velocity of the fluid will increase when passing through a reduced flow section, and its flow velocity is inversely proportional to the flow section. It is also a standard throttling device. Its principle is: when the medium fills the fluid in the pipeline and flows through the throttling device in the pipeline, the flow velocity will form a local contraction at the throat of the Venturi tube, the flow velocity increases, and the static pressure decreases, so a pressure difference is generated before and after the throat of the Venturi tube. The larger the fluid flow, the greater the pressure difference generated. The size of the flow can be measured based on the pressure difference. This measurement method is based on the flow continuity equation, that is, the law of conservation of mass, and the Bernoulli equation, that is, the law of conservation of energy.

[0043] In a preferred embodiment, the shunt tube 1 and the measuring tube 2 are connected by flanges to ensure that the shunt component 3 has no radial displacement in the shunt tube 1. Here, the shunt component 3 may be a cyclone, and the shunt tube 1 may be a cyclone shell.

[0044] like Figure 2~3 As shown, the flow splitter assembly 3 includes four swirl plates 31 ; the four swirl plates 31 are evenly distributed around the central axis of the flow splitter pipe 1 .

[0045] More preferably, the vertical distance between the first pressure sensor 41 and the second pressure sensor 42 and the inlet of the contraction section 22 is consistent with the inner diameter of the inlet of the contraction section 22 .

[0046] The diameter of the throat section 23 is half of the inlet diameter of the contraction section 22 ; the vertical distance between the third pressure sensor 43 and the inlet of the throat section 23 is also half of the inlet diameter of the contraction section 22 .

[0047] The vertical distance between the fourth pressure sensor 44 and the inlet of the straight pipe section 25 is 2.5 to 3 times the inner diameter of the straight pipe section 25 .

[0048] The contraction section 22 is a truncated cone structure, and its inner diameter gradually decreases from the inlet end to the outlet end. The cone angle of the contraction section 22 of the truncated cone structure is 21°.

[0049] The expansion section 24 is also a truncated cone structure, and its inner diameter gradually increases from the inlet end to the outlet end. The cone angle of the expansion section 24 of the truncated cone structure is 15°.

[0050] In a further preferred embodiment, a temperature sensor may be installed on the measuring tube 2 to detect the temperature of the fluid.

[0051] The present invention discloses a multiphase mass flow meter. When a multiphase fluid flows through a diversion component, due to the centrifugal force of the diversion component, the multiphase fluid will form an independent layer with a clear interface when it flows out of the diversion component. A pair of pressure sensors are arranged at relative positions of the front straight pipe section of the venturi tube. The throat section and the rear straight pipe section of the venturi tube are also provided with pressure sensors. There are four pressure sensors in total. The radially opposite pressure sensors realize the radial pressure detection of the multiphase flow, and the axial pressure sensors realize the axial pressure detection of the multiphase flow. Thus, the corresponding relationship between the axial and radial pressure differences and the mass flow rate of the multiphase flow is established, and the online measurement of the flow rate is realized, the measurement error is reduced, and the measurement accuracy is improved. The present invention solves the problem of complex and changeable flow patterns of multiphase fluids during the measurement process through the diversion component, and thus solves the measurement errors caused by material characteristics, flow size and separation efficiency of the traditional separation flowmeter during measurement. The present invention realizes accurate, reliable and real-time detection of multiphase fluids through the combination of the diversion component 3, the measuring tube 2 and the pressure sensor. The flow meter has the advantages of simple structure, high measurement accuracy, good real-time performance and wide application range. It is an important equipment in the field of industrial process monitoring and flow control.

[0052] like Figure 4 As shown, the present invention also discloses a method for obtaining the mass flow rate of a multiphase flow, which is obtained by the multiphase flow mass flowmeter of the present invention and includes the following steps: S1: Obtaining the radial pressure difference or axial pressure difference of the multiphase fluid after being split by the splitting component; S2: Obtaining the mass flow rate of the multiphase flow through the radial pressure difference or the axial pressure difference and a preset mass flow model.

[0053] When the multiphase fluid is oil and water, the preset mass flow model is:

[0054] In the above formula, is the mass flow rate of the multiphase flow; is the overall diameter of the multiphase flow; is the discharge coefficient; is the density of water, ; is the radial pressure difference of multiphase flow; is a constant; is the density of oil; is the volume oil fraction; this formula is the model relationship between the radial pressure difference and mass flow rate of multiphase flow.

[0055] or

[0056] In the above formula, is the mass flow rate of the multiphase flow; is the overall diameter of the multiphase flow; is the discharge coefficient; is the volume oil fraction; is the density of oil; is the density of water, ; is the axial pressure difference of multiphase flow; is the correction coefficient, and this formula is the model relationship between the axial pressure difference and mass flow rate of multiphase flow.

[0057] In order to further explain the mass flow rate acquisition method of the multiphase flow in the present invention, taking the oil-water two-phase fluid as an example and illustrating it through this embodiment, the following is a method for detecting the quality of oil and water in the oil-water two-phase flow: When the oil-water mixed fluid passes through the flow dividing component (3), due to the different densities of oil and water, the oil phase appears as an oil cylinder in the center of the pipeline, while the water phase appears as a water ring wrapped around the oil cylinder, such as Figure 5 As shown, at each cross section, the radial pressure difference Depend on and Sure: = + (1) in It is the radial pressure difference between the center of the pipe and the pipe wall at the front straight pipe section 21. is the radial pressure difference from the center of the pipeline to the oil-water interface at the front straight pipe section 21, It is the radial pressure difference between the oil-water interface and the pipe wall.

[0058] For single-phase flow, when the mass flow rate is a certain value, the average tangential acceleration can be expressed as a constant k. Then It can be expressed as (2) in is the density of the oil, ; d is the diameter of the oil phase, m.

[0059] Based on the simplification of formula (2), we define is the radial pressure drop between the tube core and the tube wall when the fluid is only water and the total mass flow rate is constant. The relationship between the radial pressure difference and the mass flow rate is: (3) in, is the mass flow rate of the fluid; is the discharge coefficient; is the density of water, , is the diameter of the pipe, m; It is the radial pressure drop between the tube core and the tube wall when the fluid is only water and the total mass flow rate is constant.

[0060] but , and The relationship between can be expressed as (4) Since the density difference between oil and water is not obvious, the slip velocity of oil and water is relatively small. <10%, It can be expressed as (5) in is the volume oil fraction; It is the empty oil fraction; is the influence coefficient. According to the topological structure of oil-water phase separation, (6) Substituting (2) and (5) into (4), we have (7) where k is and Alternatives; After combining (3) and (7), the total mass flow rate of the two-phase mixture can be calculated according to (8): (8) From equations (7) and (8), we can see that when When it is zero, equal , that is, equations (7) and (8) can also be applied to single-phase flow.

[0061] Phase separation can not only generate radial pressure difference between the tube wall and the tube center, but also generate axial pressure difference along the tube wall. For single-phase flow, the mass flow rate is expressed as: (9) For oil-water two-phase flow, the total axial pressure drop of the two-phase flow is equal to the linear superposition of the axial pressure differences generated by oil and water, that is, (10) in, is the total axial pressure drop of the two-phase flow, is the axial pressure drop of the oil phase, is the axial pressure drop of the water phase.

[0062] According to (9), and It is expressed as: (11) (12) in, is the mass fraction of oil.

[0063] When oil-water two-phase flow flows through the pipeline together, the mass flow rates of oil and water can be expressed as: (13) (14) Combining equations (11), (12), (13), and (14), considering similarity theory, we assume that the general formula is (15) (15) in is the correction factor, Multiply , then formula (15) is: (16) in It is defined as the axial pressure drop along the pipe wall when water flows through a specific cross section at a constant total mass flow rate. According to (9), we have (17) but and The relationship between x is (18) Substitute (11), (12), (17), and (18) into (16). It can be expressed as: (19) According to formula (19), when the volume oil fraction is zero, equal , that is, equation (19) can also be used for single-phase flow.

[0064] like Figure 6 As shown, the present invention also discloses a multiphase flow mass flow acquisition system, comprising: A data acquisition module, the data acquisition module is used to acquire the radial pressure difference or axial pressure difference of the multiphase fluid after diversion; A data processing module is used to obtain the mass flow rate of the multiphase flow through the radial pressure difference or the axial pressure difference and a preset mass flow model.

[0065] Of course, the present invention also includes a computer device / equipment / system, including a memory, a processor and a computer program stored in the memory, and the processor executes the computer program to implement the steps of the method for obtaining the mass flow rate of multiphase flow.

[0066] Preferably, the present invention further discloses a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program / instructions are executed by a processor, the steps of the method for acquiring the mass flow rate of a multiphase flow are implemented.

[0067] A computer program product comprises a computer program / instruction, which implements the steps of a method for acquiring mass flow rate of a multiphase flow when the computer program / instruction is executed by a processor.

[0068] Specifically, a schematic diagram of a terminal device provided in one embodiment of the present invention. The terminal device of this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps in the above-mentioned method embodiments are implemented. Alternatively, when the processor executes the computer program, the functions of each module / unit in the above-mentioned device embodiments are implemented.

[0069] The computer program may be divided into one or more modules / units, and the one or more modules / units are stored in the memory and executed by the processor to accomplish the present invention.

[0070] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0071] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0072] The memory may be used to store the computer programs and / or modules, and the processor implements various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory.

[0073] If the module / unit integrated in the terminal device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals. The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multiphase mass flowmeter, characterized in that: It comprises a shunt pipe (1) and a measuring pipe (2) which are connected and arranged; A flow dividing tube (1) is fixedly provided with a flow dividing assembly (3); the flow dividing assembly (3) is provided with a plurality of swirl sheets (31) around the central axis of the flow dividing tube (1); the angle between the plurality of swirl sheets (31) and the axial direction of the flow dividing tube (1) is 45°; The measuring tube (2) is provided with a plurality of pressure sensors for obtaining the radial pressure difference or axial pressure difference of the multiphase fluid after being diverted by the diverting component (3).

2. A multiphase mass flowmeter according to claim 1, characterized in that: The flow splitter assembly (3) comprises four swirl plates (31); the four swirl plates (31) are evenly distributed around the central axis of the flow splitter pipe (1).

3. A multiphase mass flowmeter according to claim 1, characterized in that: The shunt pipe (1) and the measuring pipe (2) are connected via a flange.

4. A multiphase mass flowmeter according to claim 1, characterized in that: The measuring tube (2) comprises a front straight tube section (21), a contraction section (22), a throat section (23), an expansion section (24), and a rear straight tube section (25) which are sequentially connected. A first pressure sensor (41) and a second pressure sensor (42) are arranged opposite to each other along the circumference of the front straight pipe section (21), and the first pressure sensor (41) and the second pressure sensor (42) are used to obtain the radial pressure difference of the multiphase flow; a third pressure sensor (43) is arranged on the throat section (23); a fourth pressure sensor (44) is arranged on the rear straight pipe section (25); and the third pressure sensor (43) and the fourth pressure sensor (44) are used to obtain the axial pressure difference of the multiphase flow.

5. A multiphase mass flow meter according to claim 4, characterized in that: The vertical distance between the first pressure sensor (41) and the second pressure sensor (42) and the inlet of the contraction section (22) is consistent with the inner diameter of the inlet of the contraction section (22).

6. A multiphase mass flowmeter according to claim 4, characterized in that: The diameter of the throat section (23) is half the diameter of the inlet of the contraction section (22); the vertical distance between the third pressure sensor (43) and the inlet of the throat section (23) is also half the diameter of the inlet of the contraction section (22).

7. A multiphase mass flow meter according to claim 4, characterized in that: The vertical distance between the fourth pressure sensor (44) and the inlet of the straight pipe section (25) is 2.5 to 3 times the inner diameter of the straight pipe section (25).

8. A multiphase mass flowmeter according to claim 4, characterized in that: The contraction section (22) is a truncated cone structure with a cone angle of 21°.

9. A multiphase mass flowmeter according to claim 4, characterized in that: The expansion section (24) is a frustum structure with a cone angle of 15°.

10. A method for obtaining mass flow of multiphase flow, characterized in that: The method is obtained by using the multiphase flow mass flow meter according to any one of claims 1 to 9, and includes: obtaining the radial pressure difference or axial pressure difference of the multiphase fluid after being diverted by the diversion component (3), and obtaining the mass flow rate of the multiphase flow through the radial pressure difference or axial pressure difference and a preset mass flow model.

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