Ultrasonic supercritical carbon dioxide flowmeter and flow measuring method thereof

Abstract

The invention relates to an ultrasonic type supercritical carbon dioxide flow meter and a flow measuring method thereof.The flow meter comprises a flow meter body, the flow meter body is provided with a flow channel used for circulating supercritical carbon dioxide, the flow channel is provided with a first sound channel at a first point position and a second sound channel at a second point position, and the first sound channel and the second sound channel are communicated with each other. The first sound channel and the second sound channel are connected with the flow channel in a penetrating mode and located on the same side of the central axis of the flow channel. The first ultrasonic component is arranged in the first sound channel; and the second ultrasonic assembly is arranged in the second sound channel. The flow meter can measure the supercritical carbon dioxide flow at a specific underground layer in real time, and provides accurate reference data for oilfield development engineering.

Description

Technical Field

[0001] The invention relates to an ultrasonic supercritical carbon dioxide flowmeter and a flow measurement method thereof, belonging to the technical field of medium flow measurement. Background Art

[0002] Supercritical carbon dioxide is increasingly used in the fields of petroleum and chemical industry. Due to its low cost, elimination of carbon emissions, comprehensive utilization and recycling, as well as its super permeability and various chemical properties, it has extremely wide applications in new applications such as oil production, drilling, and chemical processes, and brings good economic benefits.

[0003] Injecting supercritical carbon dioxide into the well to increase oil production has become an important replacement technology for oil field development at home and abroad. It can not only improve the recovery rate of oil fields, but also help reduce carbon dioxide emissions and protect the environment. At present, the injection of supercritical carbon dioxide into the well adopts a multi-oil layer joint injection process. Due to the heterogeneity of the reservoir, geologists have put forward the requirement of layered gas injection. For the injection of multiple thin oil layers, the injection amount of each layer may be very small. Carbon dioxide is in a supercritical state underground, and its viscosity is close to that of gas. The small flow rate and low viscosity bring difficulties to the underground layered test, and it is impossible to measure the injection amount of carbon dioxide in a single specific layer underground. Summary of the invention

[0004] In view of the above technical problems, the present invention provides an ultrasonic supercritical carbon dioxide flowmeter and a flow measurement method thereof, which can measure the supercritical carbon dioxide flow at a specific layer downhole in real time and provide accurate reference data for oilfield development projects.

[0005] To achieve the above object, the present invention adopts the following technical solutions: An ultrasonic supercritical carbon dioxide flowmeter, comprising: A flow meter body, wherein a flow channel for circulating supercritical carbon dioxide is provided on the flow meter body, wherein the flow channel is provided with a first sound channel at a first point and a second sound channel at a second point, wherein the first sound channel and the second sound channel are connected to the flow channel and are located on the same side of the central axis of the flow channel; a first ultrasonic component, disposed in the first sound channel; The second ultrasonic component is arranged in the second sound channel.

[0006] In the ultrasonic supercritical carbon dioxide flowmeter, preferably, the first ultrasonic component and the second ultrasonic component have the same structure, and the first ultrasonic component includes the following components: A piezoelectric ceramic sleeve, an ultrasonic piezoelectric ceramic component and a piezoelectric ceramic cap. The piezoelectric ceramic sleeve is arranged in the first sound channel and has a mounting cavity. The ultrasonic piezoelectric ceramic component is mounted on the bottom wall of the mounting cavity. The piezoelectric ceramic cap is mounted at the cavity opening of the mounting cavity. The piezoelectric ceramic cap is provided with a through hole for passing a lead.

[0007] In the ultrasonic supercritical carbon dioxide flowmeter, preferably, the piezoelectric ceramic sleeve is metal-sealed with the first sound channel, and a sealing member is provided between the two; and / or, The piezoelectric ceramic cap is threadedly fastened to the mounting cavity.

[0008] In the ultrasonic supercritical carbon dioxide flowmeter, preferably, there is a gap between the piezoelectric ceramic cap and the ultrasonic piezoelectric ceramic member, and the gap is filled with fixing glue; and / or, The through hole is also filled with fixing glue or the through hole is not filled with fixing glue.

[0009] In the ultrasonic supercritical carbon dioxide flowmeter, preferably, the first ultrasonic component is coaxially arranged with the first sound channel, the second ultrasonic component is coaxially arranged with the second sound channel, and the axis of the first ultrasonic component and the axis of the second ultrasonic component are arranged in a V-shape.

[0010] The ultrasonic supercritical carbon dioxide flowmeter preferably further comprises a detection component, wherein the detection component is disposed upstream of the first sound channel and the second sound channel, and the detection component comprises a temperature detection component and a pressure detection component.

[0011] A second aspect of the present invention provides an ultrasonic supercritical carbon dioxide flow measurement method, comprising the following steps: S1: Obtain the physical properties of supercritical carbon dioxide; S2: obtaining the ultrasonic velocity between a first point and a second point on the supercritical carbon dioxide flow path; S3: obtaining the actual flow rate of the supercritical carbon dioxide medium according to the difference between the ultrasonic sound velocity between the first point and the second point and the static sound velocity of the medium; S4: Obtain the mass flow rate of the flow channel where the supercritical carbon dioxide is located according to the cross-sectional area of ​​the flow channel where the supercritical carbon dioxide is located, the medium density, and the actual flow velocity of the medium.

[0012] In the ultrasonic supercritical carbon dioxide flow measurement method, preferably, step S1 specifically comprises the following steps: Obtain the real-time temperature and real-time pressure of supercritical carbon dioxide; According to the real-time temperature, real-time pressure and the corresponding relationship between the physical property parameters of supercritical carbon dioxide and the real-time temperature and real-time pressure, the medium density and medium static sound velocity of supercritical carbon dioxide are obtained.

[0013] In the ultrasonic supercritical carbon dioxide flow measurement method, preferably, step S2 specifically comprises the following steps: Obtaining the propagation time of the ultrasonic wave between the first point and the second point; The ultrasonic sound velocity between the first point and the second point on the supercritical carbon dioxide flow path is obtained according to the propagation time and the distance between the first point and the second point.

[0014] The ultrasonic supercritical carbon dioxide flow measurement method preferably controls the first point to emit the ultrasonic wave and controls the second point to receive the ultrasonic wave emitted by the first point when acquiring the propagation time of the ultrasonic wave between the first point and the second point; and / or, The second point is controlled to transmit ultrasonic waves, and the first point is controlled to receive the ultrasonic waves transmitted by the second point.

[0015] The third aspect of the present invention provides an ultrasonic supercritical carbon dioxide flow measurement device, comprising: A first processing unit, used for obtaining physical property parameters of supercritical carbon dioxide; A second processing unit is used to obtain the ultrasonic sound velocity between a first point and a second point on the supercritical carbon dioxide flow path; A third processing unit is used to obtain the actual flow rate of the supercritical carbon dioxide medium according to the difference between the ultrasonic sound velocity between the first point and the second point and the static sound velocity of the medium; The fourth processing unit is used to obtain the mass flow rate of the flow channel where the supercritical carbon dioxide is located according to the cross-sectional area of ​​the flow channel where the supercritical carbon dioxide is located, the medium density and the actual flow rate of the medium.

[0016] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any one of the above-mentioned ultrasonic supercritical carbon dioxide flow measurement methods.

[0017] A fifth aspect of the present invention provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of any one of the above-mentioned ultrasonic supercritical carbon dioxide flow measurement methods are implemented.

[0018] The present invention adopts the above technical solution, which has the following advantages: The ultrasonic supercritical carbon dioxide flow measurement method and flowmeter provided by the present invention, if the medium flows along the propagation direction of the ultrasonic wave, the ultrasonic sound velocity between two points on the medium flow path is the superposition value of the medium static sound velocity and the medium actual flow velocity. Under the premise of knowing the ultrasonic sound velocity between the two points and the medium static sound velocity, the medium actual flow velocity can be obtained. Based on this principle, after obtaining the medium static sound velocity of supercritical carbon dioxide and the ultrasonic sound velocity between the first point and the second point on the supercritical carbon dioxide flow path, the medium actual flow velocity of supercritical carbon dioxide can be obtained. According to the cross-sectional area of ​​the flow channel where the supercritical carbon dioxide is located, the medium density and the actual flow velocity of the medium obtained, the mass flow rate of the flow channel where the supercritical carbon dioxide is located can be obtained. The flowmeter is set at different depths in the well, and the supercritical carbon dioxide mass flow rate at a specific layer in the well can be measured in real time through the above-mentioned supercritical carbon dioxide flow measurement method, providing accurate reference data for oilfield development projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A flow chart of an ultrasonic supercritical carbon dioxide flow measurement method provided by an embodiment of the present invention; Figure 2 A side view of the ultrasonic supercritical carbon dioxide flowmeter provided by this embodiment of the present invention; Figure 3 for Figure 2 AA view; Figure 4 for Figure 3 A partial enlarged view of point B in the middle; Figure 5 It is a schematic diagram of the communication connection between the various components of the flow meter in the present invention; The reference numerals are as follows: 1- flow meter body; 2- first ultrasonic component; 3- second ultrasonic component; 4- temperature detection component; 5- pressure detection component; 11- flow channel; 12- first sound channel; 13- second sound channel; 21- piezoelectric ceramic sleeve; 22- ultrasonic piezoelectric ceramic component; 23- piezoelectric ceramic cap; 24- sealing member; 25- gap; 211 - mounting cavity; 231 - perforation. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are 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 persons in the art without creative work are within the scope of protection of the present invention.

[0021] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second", "third", "fourth" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0022] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside", "outside", "inner side", "outer side", "below", "above", etc. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0023] At present, the underground supercritical carbon dioxide injection adopts the multi-oil layer joint injection process. Due to the heterogeneity of the reservoir, geologists have put forward the requirement of layered gas injection. For the injection of multiple thin oil layers, the injection amount of each layer may be very small. Carbon dioxide is in a supercritical state underground, and its viscosity is close to that of gas. The small flow rate and low viscosity bring difficulties to the underground layered test, and it is impossible to measure the injection amount of carbon dioxide in a single specific layer underground.

[0024] Based on the above technical problems, the present invention provides an ultrasonic supercritical carbon dioxide flowmeter and a flow measurement method thereof, which can measure the supercritical carbon dioxide flow at a specific layer underground in real time and provide accurate reference data for oilfield development projects.

[0025] like Figure 2 , 3 As shown, the ultrasonic supercritical carbon dioxide flowmeter provided by the present invention includes the following components: a flowmeter body 1 , a first ultrasonic component 2 and a second ultrasonic component 3 .

[0026] The flow meter body 1 defines a flow channel 11 for circulating supercritical carbon dioxide; the flow channel 11 is provided with a first sound channel 12 at a first point, and a second sound channel 13 at a second point; the first ultrasonic component 2 is provided in the first sound channel 12; the second ultrasonic component 3 is provided in the second sound channel 13; the first ultrasonic component 2 and the second ultrasonic component 3 both include a transmitting end for transmitting ultrasonic waves and a receiving end for receiving ultrasonic waves. Supercritical carbon dioxide flows along the flow channel 11. Figure 3 The flow is in the direction indicated by the straight arrow. In the mass flow calculation formula, the cross-sectional area of ​​the flow channel is Figure 3 The cross-sectional area of ​​the middle flow channel 11.

[0027] When the transmitting end of the first ultrasonic component 2 transmits ultrasonic waves, the receiving end of the second ultrasonic component 3 can receive ultrasonic waves; when the transmitting end of the second ultrasonic component 3 transmits ultrasonic waves, the receiving end of the first ultrasonic component 2 can receive ultrasonic waves. Specifically, the transmitting end includes an ultrasonic transmitting probe, and the receiving end includes an ultrasonic receiving probe. The flow meter is set at different depths in the well. Through the above-mentioned supercritical carbon dioxide flow measurement method, the supercritical carbon dioxide mass flow rate at a specific layer in the well can be measured in real time, providing accurate reference data for oilfield development projects.

[0028] like Figure 4 As shown, the first ultrasonic component 2 (the structure of the second ultrasonic component 3 is the same as that of the first ultrasonic component 2) includes a piezoelectric ceramic sleeve 21, an ultrasonic piezoelectric ceramic component 22 and a piezoelectric ceramic cap 23. The piezoelectric ceramic sleeve 21 is arranged in the first sound channel 12, and the piezoelectric ceramic sleeve 21 has a mounting cavity 211; the ultrasonic piezoelectric ceramic component 22 is arranged on the bottom wall of the mounting cavity 211, and the ultrasonic piezoelectric ceramic component 22 is connected with a lead wire; the piezoelectric ceramic cap 23 is arranged at the cavity opening of the mounting cavity 211, and the piezoelectric ceramic cap 23 is provided with a through hole 231 for passing the lead wire.

[0029] The piezoelectric ceramic sleeve 21 provides a mounting base for the ultrasonic piezoelectric ceramic component 22. Specifically, the ultrasonic piezoelectric ceramic component 22 can be bonded to the inner wall of the piezoelectric ceramic sleeve 21. The piezoelectric ceramic cap 23 can block the opening of the mounting cavity 211 while serving as a lead wire, further strengthening the fixation of the ultrasonic piezoelectric ceramic component 22.

[0030] The piezoelectric ceramic sleeve 21 and the flow meter body 1 are mainly sealed with metal, and rubber seal is used as an auxiliary. Specifically, the piezoelectric ceramic sleeve 21 is threadedly connected to the first sound channel 12; a seal 24 is provided between the piezoelectric ceramic sleeve 21 and the inner wall of the first sound channel 12, and the seal 24 is a rubber ring. Furthermore, the piezoelectric ceramic sleeve 21 is made of nickel-based alloy steel, which has high strength, acid corrosion resistance, and can withstand 60MPa high pressure.

[0031] More specifically, the piezoelectric ceramic cap 23 is threadedly connected to the cavity opening of the installation cavity 211 , and the connection is stable and has good sealing performance.

[0032] In a preferred embodiment of the present invention, Figure 4As shown, there is a gap 25 between the piezoelectric ceramic cap 23 and the ultrasonic piezoelectric ceramic member 22, and the gap 25 is filled with fixing glue. After the ultrasonic piezoelectric ceramic member 22 is bonded into the piezoelectric ceramic sleeve 21, solid glue is filled on top of it, and the piezoelectric ceramic cap 23 is screwed into the piezoelectric ceramic sleeve 21 to strengthen the fixing effect on the ultrasonic piezoelectric ceramic member 22.

[0033] Furthermore, a fixing glue may be provided in the through hole 231 of the piezoelectric ceramic cap 23 to fix the lead wire in the hole. Of course, the fixing glue may not be provided in the through hole 231 .

[0034] In this embodiment, Figure 3 As shown, the first ultrasonic component 2 is coaxially arranged with the first sound channel 12, the second ultrasonic component 3 is coaxially arranged with the second sound channel 13, and the axis of the first ultrasonic component 2 and the axis of the second ultrasonic component 3 are arranged in a V-shape to cross each other, thereby reducing the size and facilitating installation in limited space underground. Figure 3 The dotted lines in FIG. 1 are the axis of the first ultrasonic component 2 and the axis of the second ultrasonic component 3 , respectively.

[0035] like Figure 5 As shown, the flow meter also includes a temperature detection member 4 and a pressure detection member 5, both of which are arranged upstream of the first sound channel 12 and the second sound channel 13, and the temperature detection member 4 is used to monitor the temperature of the supercritical carbon dioxide in real time, and the pressure detection member 5 is used to monitor the pressure of the supercritical carbon dioxide in real time, so as to obtain the real-time temperature and implementation pressure of the supercritical carbon dioxide. According to the real-time temperature and implementation pressure, the medium density and medium static sound velocity of the supercritical carbon dioxide under the real-time temperature and implementation pressure can be queried. The temperature detection member 4 and the pressure detection member 5 are respectively installed underground and located upstream of the flow meter. The real-time pressure and real-time temperature of the supercritical carbon dioxide flowing through the upstream of the flow meter can be measured in real time. The temperature detection member 4 includes a temperature sensor, and the pressure detection member 5 includes a pressure sensor.

[0036] Furthermore, the temperature detection element 4 and the pressure detection element 5 are both connected to the amplifier and the analog-to-digital converter to complete the amplification and conversion of the signal; the amplifier and the analog-to-digital converter are connected to the processor to enable the processor to obtain the real-time pressure and real-time temperature signals. The ultrasonic piezoelectric ceramic element 22 is connected to the processor through the frequency signal sending and receiving circuit to enable the processor to obtain the signal of the ultrasonic piezoelectric ceramic element 22. When executing the program, the processor is used to implement the above-mentioned ultrasonic supercritical carbon dioxide flow measurement method, and obtain the supercritical carbon dioxide mass flow, and then transmit the mass flow data to the upper computer on the ground through the communication interface. The communication interface is exemplified by RS485.

[0037] The flow meter meets the following requirements: high pressure, the maximum pressure is 100Mpa; high flow, the maximum flow is 200,000Nm 3 / d; high temperature resistance, temperature resistance up to 150℃; special materials are selected to resist corrosion by CO2 acid and high-speed fluid; it does not hinder the flow of the medium, and the flowmeter measuring components are not corroded by the medium. The flowmeter can meet the measurement of supercritical CO2 fluid flow in the underground high temperature environment of 100MPa and 150℃. The flowmeter is installed in different layers underground to measure the supercritical carbon dioxide flow passing through the place in real time and transmit it to the ground. The underground circuit components are all high-temperature resistant components to ensure that they can work at an ambient temperature of 150℃. The circuit board and transmission line are shielded by the shell to ensure normal operation under 1000 atmospheres. All signal lines are transmitted by shielded wires to shield underground electromagnetic interference. The signal processing algorithm executed by the processor uses a digital filter and adopts a variety of filtering algorithms: anti-pulse interference sliding average filtering method, 50Hz notch filter, FIR function filtering, etc. to filter noise signals and ensure measurement accuracy.

[0038] A second aspect of the present invention provides an ultrasonic supercritical carbon dioxide flow measurement method, comprising the following steps: S1: Obtaining physical property parameters of supercritical carbon dioxide, the physical property parameters including medium density and medium static sound velocity; wherein the medium static sound velocity is the propagation speed of ultrasonic waves in static supercritical carbon dioxide.

[0039] S2: Obtaining the ultrasonic velocity between the first point and the second point on the supercritical carbon dioxide flow path.

[0040] S3: Obtaining the actual flow rate of the supercritical carbon dioxide medium according to the difference between the ultrasonic sound velocity between the first point and the second point and the static sound velocity of the medium.

[0041] S4: Obtain the mass flow rate of the flow channel where the supercritical carbon dioxide is located according to the cross-sectional area of ​​the flow channel where the supercritical carbon dioxide is located, the medium density, and the actual flow velocity of the medium.

[0042] Specifically, in step S3, the actual flow rate of the supercritical carbon dioxide medium is the flow rate of the supercritical carbon dioxide relative to the flow channel.

[0043] Specifically, in step S4, the mass flow rate of supercritical carbon dioxide is calculated as follows: Mass flow rate = flow channel cross-sectional area × medium density × actual medium flow rate. According to this formula, the mass flow rate of supercritical carbon dioxide at a specific layer in the well can be obtained.

[0044] If the medium flows along the propagation direction of the ultrasonic wave, the ultrasonic sound velocity between two points on the medium flow path is the superposition value of the medium static sound velocity and the medium actual flow velocity. Under the premise of knowing the ultrasonic sound velocity between the two points and the medium static sound velocity, the medium actual flow velocity can be obtained. Based on this principle, after obtaining the medium static sound velocity of supercritical carbon dioxide and the ultrasonic sound velocity between the first point and the second point on the supercritical carbon dioxide flow path, the medium actual flow velocity of supercritical carbon dioxide can be obtained. According to the cross-sectional area of ​​the flow channel where the supercritical carbon dioxide is located, the medium density and the actual flow velocity of the medium obtained, the mass flow rate of the flow channel where the supercritical carbon dioxide is located can be obtained. The flow meter is set at different depths in the well. Through the above-mentioned supercritical carbon dioxide flow measurement method, the supercritical carbon dioxide mass flow rate at a specific layer in the well can be measured in real time, providing accurate reference data for oilfield development projects.

[0045] Furthermore, obtaining the physical property parameters of supercritical carbon dioxide in step S1 specifically includes: S11: obtaining the real-time temperature and real-time pressure of supercritical carbon dioxide; S12: Obtaining the medium density and medium static sound velocity of the supercritical carbon dioxide according to the real-time temperature, the real-time pressure, and the corresponding relationship between the physical property parameters of the supercritical carbon dioxide and the real-time temperature and the real-time pressure.

[0046] The physical parameters of supercritical carbon dioxide (medium density, medium viscosity, medium static sound velocity, etc.) are affected by pressure and temperature. Therefore, the flow rate of supercritical carbon dioxide cannot be simply calculated based on the sound velocity by applying the conventional flow calculation formula. Specifically, in this embodiment, after obtaining the real-time temperature and real-time pressure of supercritical carbon dioxide, the NIST (National Institute of Standards and Technology) database is queried, and the corresponding relationship between the physical parameters of supercritical carbon dioxide and the real-time temperature and real-time pressure is recorded in the database. The medium density and medium static sound velocity of supercritical carbon dioxide at the real-time temperature and the applied pressure are queried based on the database.

[0047] Further, in step S2, obtaining the ultrasonic velocity between the first point and the second point on the supercritical carbon dioxide flow path includes: S21: Acquire the propagation time of the ultrasonic wave between the first point and the second point; S22: Acquire the ultrasonic velocity between the first point and the second point on the supercritical carbon dioxide flow path according to the propagation time and the distance between the first point and the second point.

[0048] Under the premise that two parameters, the distance between the first point and the second point and the propagation time of the ultrasonic wave between the first point and the second point are known, the distance divided by the time is the speed, thereby obtaining the ultrasonic sound velocity between the first point and the second point on the supercritical carbon dioxide flow path, and then obtaining the actual flow velocity of the supercritical carbon dioxide medium according to the ultrasonic sound velocity and the medium static velocity obtained in step S1.

[0049] Further, when obtaining the propagation time of the ultrasonic wave between the first point and the second point, the first point is controlled to transmit the ultrasonic wave, and the second point is controlled to receive the ultrasonic wave transmitted by the first point, and the time difference between transmission and reception is the propagation time of the ultrasonic wave between the first point and the second point; and / or, the second point is controlled to transmit the ultrasonic wave, and the first point is controlled to receive the ultrasonic wave transmitted by the second point, and the time difference between transmission and reception is the propagation time of the ultrasonic wave between the first point and the second point.

[0050] The flow direction of supercritical carbon dioxide is from the first point to the second point. "Control the first point to transmit ultrasonic waves, and control the second point to receive the ultrasonic waves transmitted by the first point" is defined as forward measurement, and "Control the second point to transmit ultrasonic waves, and control the first point to receive the ultrasonic waves transmitted by the second point" is defined as reverse measurement. In practical applications, forward measurement and reverse measurement can be combined to obtain the propagation time of ultrasonic waves between the first point and the second point, which can reduce the error and ultimately control the error within 1%.

[0051] The third aspect of the present invention provides an ultrasonic supercritical carbon dioxide flow measurement device, comprising: A first processing unit, used for obtaining physical property parameters of supercritical carbon dioxide; A second processing unit is used to obtain the ultrasonic sound velocity between a first point and a second point on the supercritical carbon dioxide flow path; A third processing unit is used to obtain the actual flow rate of the supercritical carbon dioxide medium according to the difference between the ultrasonic sound velocity between the first point and the second point and the static sound velocity of the medium; The fourth processing unit is used to obtain the mass flow rate of the flow channel where the supercritical carbon dioxide is located according to the cross-sectional area of ​​the flow channel where the supercritical carbon dioxide is located, the medium density and the actual flow rate of the medium.

[0052] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any one of the above-mentioned ultrasonic supercritical carbon dioxide flow measurement methods.

[0053] A fifth aspect of the present invention provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of any one of the above-mentioned ultrasonic supercritical carbon dioxide flow measurement methods are implemented.

[0054] The present invention is described in terms of flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to specific embodiments. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0055] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0056] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ultrasonic supercritical carbon dioxide flowmeter, characterized in that: include: A flow meter body (1), wherein the flow meter body (1) is provided with a flow channel (11) for circulating supercritical carbon dioxide, the flow channel (11) is provided with a first sound channel (12) at a first point, and a second sound channel (13) at a second point, the first sound channel (12) and the second sound channel (13) are connected to the flow channel (11) and are located on the same side of the central axis of the flow channel (11); A first ultrasonic component (2) disposed in the first sound channel (12); A second ultrasonic component (3) is arranged in the second sound channel (13).

2. The ultrasonic supercritical carbon dioxide flowmeter according to claim 1, characterized in that: The first ultrasonic component (2) and the second ultrasonic component (3) have the same structure, and the first ultrasonic component (2) comprises the following components: A piezoelectric ceramic sleeve (21), an ultrasonic piezoelectric ceramic component (22), and a piezoelectric ceramic cap (23); the piezoelectric ceramic sleeve (21) is arranged in the first sound channel (12) and has a mounting cavity (211); the ultrasonic piezoelectric ceramic component (22) is mounted on the bottom wall of the mounting cavity (211); the piezoelectric ceramic cap (23) is mounted at the cavity opening of the mounting cavity (211); and the piezoelectric ceramic cap (23) is provided with a through hole (231) for passing a lead wire.

3. The ultrasonic supercritical carbon dioxide flowmeter according to claim 2, characterized in that: The piezoelectric ceramic sleeve (21) and the first sound channel (12) are metal-sealed, and a sealing member (24) is provided between the two; and / or, The piezoelectric ceramic cap (23) is threadedly fastened to the mounting cavity (211).

4. The ultrasonic supercritical carbon dioxide flowmeter according to claim 2, characterized in that: There is a gap (25) between the piezoelectric ceramic cap (23) and the ultrasonic piezoelectric ceramic component (22), and the gap (25) is filled with fixing glue; and / or, The through hole (231) is also filled with fixing glue or the through hole (231) is not filled with fixing glue.

5. The ultrasonic supercritical carbon dioxide flowmeter according to claim 1, characterized in that: The first ultrasonic component (2) is coaxially arranged with the first sound channel (12), the second ultrasonic component (3) is coaxially arranged with the second sound channel (13), and the axis of the first ultrasonic component (2) and the axis of the second ultrasonic component (3) are arranged in a V-shaped cross.

6. The ultrasonic supercritical carbon dioxide flowmeter according to any one of claims 1 to 5, characterized in that: The flow meter further comprises a detection component, wherein the detection component is disposed upstream of the first sound channel (12) and the second sound channel (13), and the detection component comprises a temperature detection component (4) and a pressure detection component (5).

7. An ultrasonic supercritical carbon dioxide flow measurement method, characterized in that: The steps include: S1: Obtain the physical properties of supercritical carbon dioxide; S2: obtaining the ultrasonic velocity between a first point and a second point on the supercritical carbon dioxide flow path; S3: obtaining the actual flow rate of the supercritical carbon dioxide medium according to the difference between the ultrasonic sound velocity between the first point and the second point and the static sound velocity of the medium; S4: Obtain the mass flow rate of the flow channel where the supercritical carbon dioxide is located according to the cross-sectional area of ​​the flow channel where the supercritical carbon dioxide is located, the medium density, and the actual flow velocity of the medium.

8. The ultrasonic supercritical carbon dioxide flow measurement method according to claim 7, characterized in that: Step S1 specifically includes the following steps: Obtain the real-time temperature and real-time pressure of supercritical carbon dioxide; According to the real-time temperature, real-time pressure and the corresponding relationship between the physical property parameters of supercritical carbon dioxide and the real-time temperature and real-time pressure, the medium density and medium static sound velocity of supercritical carbon dioxide are obtained.

9. The ultrasonic supercritical carbon dioxide flow measurement method according to claim 7, characterized in that: Step S2 specifically includes the following steps: Obtaining the propagation time of the ultrasonic wave between the first point and the second point; The ultrasonic sound velocity between the first point and the second point on the supercritical carbon dioxide flow path is obtained according to the propagation time and the distance between the first point and the second point.

10. The ultrasonic supercritical carbon dioxide flow measurement method according to claim 9, characterized in that: When acquiring the propagation time of the ultrasonic wave between the first point and the second point, controlling the first point to transmit the ultrasonic wave and controlling the second point to receive the ultrasonic wave transmitted by the first point; and / or, The second point is controlled to transmit ultrasonic waves, and the first point is controlled to receive the ultrasonic waves transmitted by the second point.

11. An ultrasonic supercritical carbon dioxide flow measurement device, characterized in that: include: A first processing unit, used to obtain physical property parameters of supercritical carbon dioxide; A second processing unit is used to obtain the ultrasonic sound velocity between a first point and a second point on the supercritical carbon dioxide flow path; A third processing unit is used to obtain the actual flow rate of the supercritical carbon dioxide medium according to the difference between the ultrasonic sound velocity between the first point and the second point and the static sound velocity of the medium; The fourth processing unit is used to obtain the mass flow rate of the flow channel where the supercritical carbon dioxide is located according to the cross-sectional area of ​​the flow channel where the supercritical carbon dioxide is located, the medium density and the actual flow rate of the medium.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the ultrasonic supercritical carbon dioxide flow measurement method according to any one of claims 7 to 10 are implemented.

13. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the ultrasonic supercritical carbon dioxide flow measurement method according to any one of claims 7 to 10 are implemented.

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