Multiphase mass flow meter based on centrifugal separation

Abstract

The utility model discloses a multiphase mass flowmeter based on centrifugal separation, which comprises a shell, a fluid pipeline, a double differential pressure sensor and a flow computer, and is characterized in that the fluid pipeline comprises an inlet section, an outlet section and a centrifugal rewinding section; a first pressure measuring point, a second pressure measuring point and a third pressure measuring point which are positioned on the same level are respectively arranged on the centrifugal rewinding section close to the outer side of the inlet section, the outer side of the outlet section and the inner side of the inlet section; the double-differential pressure sensor comprises a plurality of pressure sensing holes and two sensor cores, wherein the pressure sensing holes correspond to the pressure measuring points respectively. And each pressure sensing hole is connected with the corresponding pressure tapping point through a first pressure tapping pipe, a second pressure tapping pipe and a third pressure tapping pipe. According to the multiphase mass flow meter, centrifugal separation can be conducted on fluid through the arrangement mode of the fluid pipeline, the fluid flows into the double differential pressure sensors through the corresponding pressure taking pipes at different pressure taking points, and differential pressure data are measured through the two sensor core bodies; and the fluid flow is calculated through the flow computer according to the measured differential pressure data, and the device is compact in structure, convenient and easy to use.

Description

Technical Field

[0001] The present application relates to the technical field of mass flow measurement, and in particular to a multiphase mass flowmeter based on centrifugal separation. Background Art

[0002] A mass flowmeter is an instrument used to measure the mass flow rate of a fluid flowing through a pipeline (the mass of the fluid flowing through a certain cross-section per unit time). According to the working principle, it is classified into turbine flowmeters, vortex flowmeters, differential pressure flowmeters, etc. Among them, the differential pressure flowmeter is based on the Bernoulli equation and the flow continuity equation. When the measured medium flows through the differential pressure device, a differential pressure is generated on both sides of it, and by measuring the differential pressure, the flow rate of the fluid is determined based on the relationship between the differential pressure and the flow rate. Differential pressure flowmeters generally measure differential pressure using two types of elements: throttling differential pressure devices and non-throttling differential pressure devices. For example, throttling differential pressure devices usually use structures such as orifice plates and venturi tubes to reduce the cross-sectional area of ​​the fluid channel, forcing the fluid to accelerate through the narrow area to generate a pressure difference; non-throttling differential pressure devices usually use structures such as elbows and velocity-averaging tubes to generate a pressure difference without significantly reducing the fluid channel.

[0003] Chinese Patent Publication No. CN118424400B discloses a gas-liquid two-phase fluid flow measurement method and gas-liquid two-phase flowmeter. This flowmeter uses the principle of fluid centrifugal separation to achieve transient separation between gas-liquid two-phase fluid media. It also combines the fluid flow rate at a specific horizontal radial section of a non-throttling spiral annular tube to achieve transient gas-liquid flow measurement. However, this mass flowmeter's multi-parameter sensors, which measure differential pressure through independent installation, take up a large amount of space, are not compact, and are affected by external temperature, potentially leading to measurement errors. Utility Model Content

[0004] The main purpose of this application is to provide a multiphase mass flowmeter based on centrifugal separation, aiming to solve the technical problems of low structural utilization and large space occupation of existing mass flowmeters.

[0005] To achieve the above objectives, the present application proposes a multiphase mass flowmeter based on centrifugal separation, the multiphase mass flowmeter comprising:

[0006] case;

[0007] a fluid pipeline disposed in the housing, the fluid pipeline comprising an inlet section, a centrifugal rewind section, and an outlet section connected in sequence, the centrifugal rewind section being perpendicular to and connecting the inlet section and the outlet section, the centrifugal rewind section having at least one rewinding circle; a first pressure point being disposed on the outer side of the centrifugal rewind section adjacent to the inlet section, a second pressure point being disposed on the outer side of the centrifugal rewind section adjacent to the outlet section, and a third pressure point being disposed on the inner side of the centrifugal rewind section adjacent to the inlet section, the first pressure point, the second pressure point, and the third pressure point being located at the same horizontal position;

[0008] A dual differential pressure sensor, comprising pressure-sensing holes corresponding to the first, second, and third pressure points, and two sensor cores; each pressure-sensing hole is connected to the corresponding pressure point via a first, second, and third pressure-sensing tube, so that fluids at different pressure points flow into the dual differential pressure sensor through the first, second, and third pressure-sensing tubes, respectively, and differential pressure data is measured by the two sensor cores;

[0009] A flow computer is arranged outside the housing and is in communication with the two sensor cores, and is used for calculating the fluid flow rate according to the measured differential pressure data.

[0010] For example, in the multiphase mass flowmeter provided in at least one embodiment of the present application, the plane where the pressure sensing hole of the dual differential pressure sensor is located is on the same horizontal line as the first pressure point, the second pressure point, and the third pressure point.

[0011] For example, in the multiphase mass flowmeter provided in at least one embodiment of the present application, an absolute pressure sensor is provided on the third pressure taking pipe near the third pressure taking point.

[0012] For example, in the multiphase mass flowmeter provided in at least one embodiment of the present application, a temperature sensor is integrated inside the absolute pressure sensor or the temperature sensor is further provided on the third pressure taking tube near the third pressure taking point.

[0013] For example, in the multiphase mass flowmeter provided in at least one embodiment of the present application, the interior of the shell is also filled with thermal insulation material.

[0014] For example, in the multiphase mass flowmeter provided in at least one embodiment of the present application, the centrifugal winding section adopts a thick-walled tube with a thickness of 3 mm to 5 mm.

[0015] For example, in the multiphase mass flowmeter provided in at least one embodiment of the present application, the centrifugal winding section is made of 304 or 316 stainless steel.

[0016] For example, in the multiphase mass flowmeter provided in at least one embodiment of the present application, the shell is an arc-shaped shell or a cylindrical shell.

[0017] For example, in the multiphase mass flowmeter provided in at least one embodiment of the present application, at least one of the first pressure taking tube, the second pressure taking tube, and the third pressure taking tube is a Pitot tube pressure taking tube.

[0018] Compared with the existing mass flowmeters, the mass flowmeter of the present application has at least the following beneficial effects: by arranging a fluid pipeline inside the shell and separating the multiphase fluid flowing through the mass flowmeter with a spiral centrifugal winding section, and arranging pressure points on the inner and outer side walls at the same horizontal height of the centrifugal winding section, measurement errors caused by height differences when the fluid medium is introduced into the differential pressure sensor are avoided; each pressure point is respectively connected to the corresponding pressure sensing hole of the dual differential pressure sensor through a pressure pipe, and the dual differential pressure sensor is used to measure the pressure (differential pressure) data between different pressure points, thereby transmitting the data to the flow computer to calculate the mass flow rate. The mass flowmeter of the present application has a simple and compact structure and a small overall design volume. It can be applied to a wide range of measurement scenarios to achieve mass flow measurement of single-phase or multi-phase media. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 This is a front view of an embodiment of a mass flow meter of the present application;

[0021] Figure 2 for Figure 1 A top view of an embodiment;

[0022] Figure numerals: 1. Shell; 2. Fluid pipeline; 21. Inlet section; 22. Outlet section; 23. Centrifugal winding section; 24. First pressure point; 25. Second pressure point; 26. Third pressure point; 3. Dual differential pressure sensor; 31. First pressure pipe; 32. Second pressure pipe; 33. Third pressure pipe; 4. Flow computer; 5. Absolute pressure sensor; 6. Thermal insulation material.

[0023] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] like Figure 1 、 Figure 2Shown is an embodiment of a multiphase mass flowmeter based on centrifugal separation provided by the present application, which includes: a shell 1, a fluid pipeline 2, a dual differential pressure sensor 3 and a flow computer 4; wherein, the top of the shell 1 is an arc or arch shape. It can be understood that the shell 1 can also be set to a regular cylindrical shape, etc., so as to reduce the overall occupied space of the multiphase mass flowmeter and be suitable for a wider range of measurement scenarios. In this embodiment, specifically, the fluid pipeline 2 is arranged inside the shell 1, and the fluid pipeline 2 includes an inlet section 21, a centrifugal winding section 23 and an outlet section 22 connected in sequence. The centrifugal winding section 23 is perpendicular to the inlet section 21 and the outlet section 22 and connects the inlet section 21 and the outlet section 22. The centrifugal winding section 23 has at least one winding circle, such as one turn, two turns or more; a first pressure point 24 is provided on the outer side of the centrifugal winding section 23 adjacent to the inlet section 21, a second pressure point 25 is provided on the outer side of the centrifugal winding section 23 adjacent to the outlet section 22, and a third pressure point 26 is provided on the inner side of the centrifugal winding section 23 adjacent to the inlet section 21. In particular, the first pressure point 24, the second pressure point 25 and the third pressure point 26 are located at the same horizontal position, that is, as shown in FIG. Figure 1 The dual differential pressure sensor 3 is also arranged inside the housing 1 and on one side of the centrifugal winding section 23, and includes pressure-sensing holes and two sensor cores corresponding to the first pressure point 24, the second pressure point 25 and the third pressure point 26 respectively; each pressure-sensing hole is connected to the corresponding pressure point (for example, the first pressure point 24 and the third pressure point 26). Figure 1 The pressure-sensing hole on the left side of the dual differential pressure sensor 3 is connected through the first pressure-taking tube 31, the second pressure-taking tube 32 and the third pressure-taking tube 33, so that the fluid medium at different pressure points flows into the dual differential pressure sensor 3 through the first pressure-taking tube 31, the second pressure-taking tube 32 and the third pressure-taking tube 33 respectively, and the differential pressure data is measured by the two sensor cores; and then the flow computer 4 arranged outside the shell 1 and communicatively connected to the two sensor cores calculates the flow of the fluid medium according to the measured differential pressure data.

[0029] Combine Figure 1Three pressure points are set on the centrifugal winding section 23 of the fluid pipeline 2. The first pressure point 24 is set on the horizontal axis where the center of the winding circle is located, and is set on the outside of the centrifugal winding section (for example, in the form of a circular centrifuge tube). It measures the outside pressure of the medium when it flows through the centrifugal winding section 23; the second pressure point 25 is set on the horizontal axis where the center of the circle is located (the first pressure point 24 and the second pressure point 25 are symmetrical about the center of the circle). It is also set on the outside of the centrifugal winding section 23 and measures the outside pressure of the medium when it flows through the centrifugal winding section 23. The fluid medium passes through the inlet section 21, first flows through the first pressure point 24 and then flows through the second pressure point 25, and finally flows out through the outlet section 22. It can be understood that the first pressure point 24 and the second pressure point 25 are both high-pressure pressure points, and the third pressure point 26 located on the inner side of the centrifugal winding section 23 is a low-pressure pressure point. The mass flow rate of the fluid medium can be measured by calculating the differential pressure between the first pressure point 24, the second pressure point 25 and the third pressure point 26 and importing it into the flow computer 4.

[0030] It should be noted that in each embodiment of the present application, the structural contents of the dual differential pressure sensor 3 and the flow computer 4 can be obtained from the prior art and are not improvements of the present application and will not be described in detail here.

[0031] The multiphase mass flowmeter provided by the above embodiment separates the multiphase fluid medium flowing through the mass flowmeter by arranging a fluid pipeline 2 inside the shell 1 and using a centrifugal winding section 23 in the form of a winding circle, and arranges multiple pressure points on the inner and outer side walls at the same horizontal height of the centrifugal winding section 23, which are respectively connected to the corresponding pressure sensing holes of the dual differential pressure sensor 3 through the first pressure taking tube, the second pressure taking tube and the third pressure taking tube. Compared with the existing multi-parameter sensors designed independently of each other, only one dual differential pressure sensor 3 (two sensor cores) can be used to measure the pressure (differential pressure) data of different pressure points, thereby improving the space utilization of the mass flowmeter, reducing the design volume, and transmitting the data to the flow computer 4 to calculate the mass flow. The mass flowmeter of the present application has a simple and compact structure and a small overall volume, and can be applied to a wide range of measurement scenarios to realize the mass flow measurement of multiphase media.

[0032] Furthermore, in order to ensure the accuracy of mass flow measurement and reduce errors, in the multiphase mass flowmeter provided in at least one embodiment of the present application, the dual differential pressure sensor 3 is located at the same horizontal position as the first pressure point 24, the second pressure point 25 and the third pressure point 26.

[0033] The dual differential pressure sensor 3 maintains the same horizontal position as each pressure taking point, which can ensure that the pressure of the fluid medium connected to each pressure taking point will not cause errors due to the use of pressure taking tubes - for example, the height difference of the pressure taking tube affects the differential pressure, thereby ensuring that the pressure at the two sensor core positions is consistent with the centrifugal winding section 23, and the measured differential pressure data is more accurate.

[0034] In the multiphase mass flowmeter provided in at least one embodiment of the present application, an absolute pressure sensor 5 is provided near the third pressure taking point 26 of the third pressure taking tube 33. The absolute pressure sensor 5 is a sensor for measuring absolute pressure. Absolute pressure refers to the pressure relative to a complete vacuum, that is, the pressure value with zero pressure (absolute vacuum) as the reference point. By providing the absolute pressure sensor 5 at the third pressure taking point 26 (nearby), the absolute pressure value of the pressure taking point can be measured; further, a temperature sensor can be integrated inside the absolute pressure sensor 5, and the temperature can be measured by temperature correction. Specifically, when the temperature sensor leaves the factory, a large amount of data is used to calibrate the temperature and pressure to form a mapping relationship between temperature and pressure. After the temperature measurement module in the absolute pressure sensor 5 measures the actual temperature, a more accurate corrected temperature is obtained through correction. It can be understood that the temperature sensor can also be independently provided at the third pressure taking point 26 (nearby).

[0035] In the multiphase mass flowmeter provided in at least one embodiment of the present application, the interior of the housing 1 is further filled with a thermal insulation material 6. The thermal insulation material 6 can be a lightweight, flame-retardant material, such as polyurethane foam, rock wool, or other foam-type insulation materials. Using such materials can make the temperature measured by the temperature sensor more accurate, avoiding errors caused by ambient temperature.

[0036] In the multiphase mass flowmeter provided in at least one embodiment of the present application, the centrifugal winding section 23 adopts a thick-walled tube with a thickness of 3mm to 5mm; the material can be 304 or 316 stainless steel or other erosion-resistant materials to extend the service life of the multiphase mass flowmeter.

[0037] In the multiphase mass flowmeter provided in at least one embodiment of the present application, at least one of the first pressure-taking tube 31, the second pressure-taking tube 32, and the third pressure-taking tube 33 is a Pitot tube. A Pitot tube is a simple and effective tool for measuring fluid velocity, and is widely used in velocity measurement of air and other fluids. Its basic principle is to calculate the velocity of the fluid by measuring the total pressure (the sum of dynamic pressure and static pressure) and static pressure of the fluid. The use of a Pitot tube in the present application is beneficial to the durability of the multiphase mass flowmeter, and has low maintenance costs and high measurement accuracy.

[0038] In conjunction with the aforementioned embodiments, the measurement process of the multiphase mass flowmeter of the present application is briefly described: the dual differential pressure sensor 3 measures the differential pressure value between the first pressure point 24 and the third pressure point 26, and the differential pressure value between the second pressure point 25 and the third pressure point 26, and the absolute pressure sensor 5 measures the absolute pressure of the third pressure point 26. The total flow rate is obtained by the differential pressure value of the second pressure point 25 and the third pressure point 26. After obtaining the total flow rate, the flow rate of each phase is obtained by the differential pressure value between the first pressure point 24 and the third pressure point 26 and the absolute pressure value of the third pressure point 26. The above calculation process is completed in the flow computer 4, which has a built-in program or analysis model for specific calculations. This part can be obtained from the existing technology and does not belong to the improvement point of the present application, so it will not be repeated here.

[0039] The above description is merely an optional embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made using the contents of the present application specification and drawings under the inventive concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A multiphase mass flowmeter based on centrifugal separation, characterized in that: The multiphase mass flowmeter comprises: case; a fluid pipeline disposed in the housing, the fluid pipeline comprising an inlet section, a centrifugal rewind section, and an outlet section connected in sequence, the centrifugal rewind section being perpendicular to and connecting the inlet section and the outlet section, the centrifugal rewind section having at least one rewinding circle; a first pressure point being disposed on the outer side of the centrifugal rewind section adjacent to the inlet section, a second pressure point being disposed on the outer side of the centrifugal rewind section adjacent to the outlet section, and a third pressure point being disposed on the inner side of the centrifugal rewind section adjacent to the inlet section, the first pressure point, the second pressure point, and the third pressure point being located at the same horizontal position; A dual differential pressure sensor, comprising pressure-sensing holes corresponding to the first, second, and third pressure points, and two sensor cores; each pressure-sensing hole is connected to the corresponding pressure point via a first, second, and third pressure-sensing tube, so that fluids at different pressure points flow into the dual differential pressure sensor through the first, second, and third pressure-sensing tubes, respectively, and differential pressure data is measured by the two sensor cores; A flow computer is arranged outside the housing and is in communication with the two sensor cores, and is used for calculating the fluid flow rate according to the measured differential pressure data.

2. The multiphase mass flowmeter according to claim 1, characterized in that: The plane where the pressure-sensing hole of the dual differential pressure sensor is located is on the same horizontal line as the first pressure point, the second pressure point, and the third pressure point.

3. The multiphase mass flowmeter according to claim 1, characterized in that: An absolute pressure sensor is provided on the third pressure taking pipe near the third pressure taking point.

4. The multiphase mass flowmeter according to claim 3, characterized in that: A temperature sensor is integrated inside the absolute pressure sensor or the temperature sensor is further provided on the third pressure taking tube near the third pressure taking point.

5. The multiphase mass flowmeter according to claim 1, characterized in that: The interior of the shell is also filled with thermal insulation material.

6. The multiphase mass flowmeter according to claim 1, characterized in that: The centrifugal winding section adopts a thick-walled tube with a thickness of 3mm to 5mm.

7. The multiphase mass flowmeter according to claim 1, characterized in that: The centrifugal winding section is made of 304 or 316 stainless steel.

8. The multiphase mass flowmeter according to claim 1, characterized in that: The shell is an arc-shaped shell or a cylindrical shell.

9. The multiphase mass flowmeter according to claim 1, characterized in that: At least one of the first pressure-taking tube, the second pressure-taking tube, and the third pressure-taking tube is a Pitot tube pressure-taking tube.

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