A wide temperature high pressure coriolis mass flowmeter deviation correction system and method

Abstract

The present application belongs to the technical field of mass flow meter detection, and particularly relates to a wide temperature and high pressure Coriolis mass flow meter deviation correction system and method. The wide temperature and high pressure Coriolis mass flow meter deviation correction system and method corrects the measurement deviation of the Coriolis mass flow meter caused by temperature and pressure changes under wide temperature and high pressure working conditions, improves the measurement accuracy of the Coriolis mass flow meter, and has many technical advantages such as high correction model accuracy, good real-time performance, and simple operation process. The wide temperature and high pressure Coriolis mass flow meter deviation correction method comprises: collecting the instantaneous mass flow Q0 of the Coriolis mass flow meter to be corrected; calculating the flow coefficient k0 of the Coriolis mass flow meter to be corrected under standard calibration working conditions; collecting the uncorrected instantaneous mass flow Q of the Coriolis mass flow meter to be corrected; and calculating the corrected instantaneous mass flow Q' of the Coriolis mass flow meter to be corrected under wide temperature and high pressure working conditions.

Description

Technical Field

[0001] This invention belongs to the field of mass flow meter detection technology, and particularly relates to a deviation correction system and method for a wide-temperature, high-pressure Coriolis mass flow meter. Background Technology

[0002] The Coriolis mass flow meter, a measuring device that utilizes the Coriolis force generated when fluid flows through a vibrating pipe and is proportional to the mass flow rate, is widely used in the petroleum refining industry. During use, the inventors discovered that the environmental conditions (temperature, pressure) of the medium detected by the Coriolis mass flow meter at the wellhead vary greatly, which deviates significantly from the conditions (normal temperature and pressure (≤1MPa)) used during standard calibration in the laboratory. For example, at the CCUS-EOR CO2 injection wellhead, the high-pressure, low-temperature liquid CO2 gas used by technicians can reach pressures of 5–40 MPa and temperatures of approximately -10–40°C; while in the injection conditions of various oil layers downhole, the high-pressure, high-temperature, supercritical CO2 gas can reach pressures of 20–40 MPa and temperatures of approximately ≥80°C. Therefore, technicians need to correct the deviation of the Coriolis mass flow meter according to the actual construction conditions. To address the aforementioned technical problems, technicians have made numerous technical attempts in the existing technology. For example, the patent document titled "Coriolis Mass Flow Meter Device with Pressure Compensation," application number CN202210500004.0, describes the following technical solution: a Coriolis mass flow meter device with pressure compensation, comprising a Coriolis mass flow meter and a pressure detection device. One end of the Coriolis mass flow meter is connected to a pipeline, and the pressure detection device is disposed on the outer surface of the pipeline. This invention determines the pressure of the fluid medium in the pipeline through ultrasonic transceiver, which has the advantage of not intruding into the pipeline. When the pressure detection device malfunctions, it can be easily removed from the pipeline without affecting the normal operation of the pipeline, and the required cost is very low.

[0003] Furthermore, the patent document titled "Diagnostic Apparatus and Method for Coriolis Flowmeters," application number CN200380110575.9, describes the following technical solution: A method for verifying the flow calibration coefficient of a flowmeter, comprising determining the initial bending stiffness of a flowmeter assembly. The method further comprises determining the current bending stiffness of the assembly. The method also comprises comparing the initial bending stiffness with the current bending stiffness. Finally, the method further comprises detecting a calibration error condition in response to the comparison of the initial bending stiffness and the current bending stiffness.

[0004] However, further research revealed that existing technologies, including the aforementioned patent documents, cannot accurately correct the deviation of the Coriolis mass flow meter under actual construction conditions. It is worth noting that with changes in temperature and pressure, many structural units in the Coriolis mass flow meter undergo deformation (e.g., changes in the outer diameter, inner diameter, and torsion radius of the measuring tube); furthermore, the physical elastic properties of the measuring tube (e.g., Young's modulus, stiffness) also change. The superposition of these factors (compared to the calibration conditions) further leads to zero-point drift and sensitivity deviation in the Coriolis mass flow meter, reducing its measurement accuracy. Therefore, there is an urgent need for those skilled in the art to provide a deviation correction technology for Coriolis mass flow meters applicable to a wide temperature and high pressure range, to correct measurement deviations caused by changes in temperature and pressure under wide temperature and high pressure (≤40MPa) conditions. Summary of the Invention

[0005] This invention provides a deviation correction system and method for a wide-temperature, high-pressure Coriolis mass flow meter. The deviation correction method provides a deviation correction model that corrects the measurement deviation of the Coriolis mass flow meter caused by temperature and pressure changes under wide-temperature and high-pressure (≤40MPa) conditions, thereby improving the measurement accuracy of the Coriolis mass flow meter. It has many technical advantages such as high accuracy of the correction model, good real-time performance, and simple operation process.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A wide-temperature, high-pressure Coriolis mass flow meter deviation correction system includes: a front-end shut-off valve, a front-end pressure transmitter, a rear-end shut-off valve, a rear-end pressure transmitter, and a flow and temperature monitoring sensor.

[0008] The front-end shut-off valve and the front-end pressure transmitter are configured on the front-end pipeline of the Coriolis mass flow meter to be corrected; the rear-end shut-off valve, the rear-end pressure transmitter, and the flow and temperature monitoring sensor are configured on the rear-end pipeline of the Coriolis mass flow meter to be corrected.

[0009] Preferred components also include: a control unit and a host computer;

[0010] The control unit is connected to the front-end shut-off valve, the front-end pressure transmitter, the rear-end shut-off valve, the rear-end pressure transmitter, and the flow and temperature monitoring sensor for data communication.

[0011] The host computer and the control unit can communicate with each other.

[0012] A more preferred embodiment also includes: an inlet buffer tank located at the front end of the Coriolis mass flow meter to be corrected, and an outlet buffer tank located at the rear end of the Coriolis mass flow meter to be corrected.

[0013] On the other hand, the present invention also provides a method for correcting the deviation of a wide-temperature, high-pressure Coriolis mass flow meter, characterized by comprising the following steps:

[0014] Step 1: Configure standard calibration conditions for the Coriolis mass flow meter to be corrected;

[0015] Under standard calibration conditions, after zeroing the flow count of the Coriolis mass flow meter to be corrected, the instantaneous mass flow rate Q0 of the Coriolis mass flow meter to be corrected is collected.

[0016] Step 2: Based on the instantaneous mass flow rate Q0 of the Coriolis mass flow meter to be corrected obtained in Step 1, calculate the flow coefficient k0 of the Coriolis mass flow meter to be corrected under standard verification conditions.

[0017] Among them, the flow coefficient k0 of the Coriolis mass flow meter to be corrected under standard verification conditions satisfies:

[0018] In formula (1), z0 is the phase difference of the Coriolis mass flow meter to be corrected under standard verification conditions; z0 is the zero point of the Coriolis mass flow meter to be corrected under standard verification conditions, where z0 = 0.

[0019] Step 3: Adjust the operating conditions of the Coriolis mass flow meter to be corrected to wide temperature and high pressure conditions; under wide temperature and high pressure conditions, after clearing the flow count of the Coriolis mass flow meter to be corrected to zero, collect the uncorrected instantaneous mass flow rate Q of the Coriolis mass flow meter to be corrected.

[0020] Step 4: Based on the uncorrected instantaneous mass flow rate Q of the Coriolis mass flow meter to be corrected obtained in Step 3, calculate the corrected instantaneous mass flow rate Q' of the Coriolis mass flow meter under wide temperature and high pressure conditions.

[0021] Among them, the corrected instantaneous mass flow rate Q' of the Coriolis mass flow meter under wide temperature and high pressure conditions satisfies:

[0022] In equation (2), k is the flow coefficient of the Coriolis mass flow meter to be corrected under wide temperature and high pressure conditions.

[0023] Preferably, the flow coefficient k of the Coriolis mass flow meter to be corrected in step four is the flow coefficient deviation k caused by pressure. P and the flow coefficient deviation k caused by temperature T Determined by co-fitting.

[0024] The preferred option is the flow coefficient deviation k caused by pressure. P ,satisfy:

[0025] When P ≤ 5 MPa, k P =k0[1+0.335×(P-P0)](3);

[0026] When 5 ≤ P ≤ 40 MPa, k P =k0[1+0.000008P 3 -0.0007P 2 +0.0199P+0.0955-0.335P0)](4).

[0027] The preferred value is the temperature-induced deviation of the flow coefficient k. T ,satisfy:

[0028] k T =k0[1+0.0002×(T-T0)] (5).

[0029] More preferably, the flow coefficient k of the Coriolis mass flow meter to be corrected satisfies:

[0030] When P ≤ 5 MPa, k = k0[1 + 0.335 × (P - P0) + 0.0002 × (T - T0)] (6);

[0032] When 5 ≤ P ≤ 40 MPa, k = k0[1 + 0.000008P] 3 -0.0007P 2 +0.0199P +0.0955 -0.335P0)

[0033] +0.0002×(T-T0)](7).

[0034] This invention provides a wide-temperature, high-pressure Coriolis mass flow meter deviation correction system and method. The method includes the following steps: Step 1: Configure standard calibration conditions for the Coriolis mass flow meter to be corrected; collect the instantaneous mass flow rate Q0 of the Coriolis mass flow meter to be corrected; Step 2: Calculate the flow coefficient k0 of the Coriolis mass flow meter to be corrected under the standard calibration conditions; Step 3: Adjust the operating conditions of the Coriolis mass flow meter to be corrected to wide-temperature, high-pressure conditions; collect the uncorrected instantaneous mass flow rate Q of the Coriolis mass flow meter to be corrected; Step 4: Calculate the corrected instantaneous mass flow rate Q' of the Coriolis mass flow meter to be corrected under the wide-temperature, high-pressure conditions.

[0035] The wide-temperature, high-pressure Coriolis mass flow meter deviation correction system and method, possessing the above-described steps, is suitable for real-time correction of zero-point drift and sensitivity deviation defects in Coriolis mass flow meters under wide-temperature and high-pressure operating conditions. Compared with existing technologies, it has at least the following technical advantages:

[0036] (1) The deviation correction method of the Coriolis mass flow meter under wide temperature and high pressure provided by the present invention can simultaneously correct the zero drift and sensitivity deviation defects of the Coriolis mass flow meter under wide temperature and high pressure conditions in real time.

[0037] (2) The wide-temperature and high-pressure Coriolis mass flow meter deviation correction system provided by the present invention can independently complete the deviation correction of the Coriolis mass flow meter under test; during the test, the corresponding (mass flow, temperature and pressure, etc.) working condition information can be displayed in real time, the operation process is simple and the real-time exchange is good.

[0038] (3) The deviation correction method for wide-temperature and high-pressure Coriolis mass flow meters provided by the present invention can adapt to the wide-temperature and high-pressure deviation of Coriolis mass flow meters of different manufacturers, different pipe types and different specifications. The correction model on which it is based is not limited to the linear model and has a wide range of applications. Attached Figure Description

[0039] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the following drawings:

[0040] Figure 1 A schematic diagram of a deviation correction system for a wide-temperature, high-pressure Coriolis mass flow meter provided by the present invention;

[0041] Figure 2 A schematic flowchart of a wide-temperature, high-pressure Coriolis mass flow meter deviation correction method provided by the present invention;

[0042] Figure 3 The pressure-induced deviation k of the flow coefficient under different pressure values. P A schematic diagram of the change curve.

[0043] Figure label:

[0044] 1. Front-end shut-off valve; 2. Front-end pressure transmitter; 3. Coriolis mass flow meter to be corrected; 4. Rear-end shut-off valve; 5. Control unit; 6. Flow and temperature monitoring sensor; 7. Rear-end pressure transmitter. Detailed Implementation

[0045] This invention provides a deviation correction system and method for a wide-temperature, high-pressure Coriolis mass flow meter. The deviation correction method provides a deviation correction model that corrects the measurement deviation of the Coriolis mass flow meter caused by temperature and pressure changes under wide-temperature and high-pressure (≤40MPa) conditions, thereby improving the measurement accuracy of the Coriolis mass flow meter. It has many technical advantages such as high accuracy of the correction model, good real-time performance, and simple operation process.

[0046] Example 1

[0047] This invention provides a wide-temperature, high-pressure Coriolis mass flow meter deviation correction system, such as... Figure 1 As shown, it includes: a front-end shut-off valve, a front-end pressure transmitter, a rear-end shut-off valve, a rear-end pressure transmitter, and a flow and temperature monitoring sensor.

[0048] The system includes a front-end shut-off valve installed on the front-end pipeline of the Coriolis mass flow meter to be calibrated, used for flow control in this pipeline. A front-end pressure transmitter is also installed on the front-end pipeline to detect pressure in this pipeline. Similarly, a rear-end shut-off valve is installed on the rear-end pipeline of the Coriolis mass flow meter to control flow in this pipeline. The rear-end pressure transmitter is also installed on the rear-end pipeline to detect pressure in this pipeline. Furthermore, a flow and temperature monitoring sensor is used to collect real-time flow and temperature data from the Coriolis mass flow meter to be calibrated (e.g., temperature T0 and pressure P0 under standard calibration conditions; and temperature T and pressure P under wide-temperature and high-pressure conditions).

[0049] As a preferred embodiment of the present invention, such as Figure 1 As shown, the wide-temperature, high-pressure Coriolis mass flow meter deviation correction system provided by this invention also includes a control unit and a host computer. The control unit is connected to the front-end shut-off valve, front-end pressure transmitter, rear-end shut-off valve, rear-end pressure transmitter, and flow and temperature monitoring sensor for data communication. It is used to aggregate and process the data collected by the front-end pressure transmitter, rear-end pressure transmitter, and flow and temperature monitoring sensor, and to control the flow of the front-end and rear-end shut-off valves. Furthermore, the host computer communicates with the control unit. Specifically, the host computer is used to load various control programs required by the control unit and store relevant data.

[0050] As a preferred embodiment of the present invention, the wide-temperature high-pressure Coriolis mass flow meter deviation correction system provided by the present invention further includes: an inlet buffer tank disposed at the front end of the Coriolis mass flow meter to be corrected and an outlet buffer tank disposed at the rear end of the Coriolis mass flow meter to be corrected.

[0051] Example 2

[0052] Example 2 further provides a method for correcting the deviation of a wide-temperature, high-pressure Coriolis mass flow meter. Specifically, this method for correcting the deviation of a wide-temperature, high-pressure Coriolis mass flow meter includes, for example... Figure 2 As shown, it includes the following steps:

[0053] Step 1: Configure standard calibration conditions for the Coriolis mass flow meter to be corrected;

[0054] Under standard calibration conditions, after zeroing the flow count of the Coriolis mass flow meter to be corrected, the instantaneous mass flow rate Q0 of the Coriolis mass flow meter to be corrected is collected.

[0055] To further explain the deviation correction method for the wide-temperature, high-pressure Coriolis mass flow meter provided by this invention, the deviation correction process of the RHM15 Coriolis mass flow meter from Rheonik in Germany is used as an example for illustration.

[0056] Specifically, the technical specifications of the German Rheonik RHM15 Coriolis mass flow meter under standard calibration conditions (normal temperature and pressure) are as follows: the measuring tube has an Ω-shaped structure, the material is SS316Ti, Young's modulus E = 193 GPa, pressure resistance 45 MPa, outer diameter d0 = 15 mm, inner diameter d1 = 9 mm, torsion radius r = 114.3 mm, and length L = 237 mm. Flow measurement range: 240~12000 kg / h, accuracy 0.1%; temperature measurement range: -50~120℃.

[0057] One point to add is that before collecting the instantaneous mass flow rate Q0 of the Coriolis mass flow meter to be corrected, the flow count of the Coriolis mass flow meter to be corrected must first be zeroed. The purpose of zeroing is to ensure that the zero point of the Coriolis mass flow meter to be corrected is 0 under standard verification conditions, thereby simplifying the calculation process in subsequent steps.

[0058] Step 2: Based on the instantaneous mass flow rate Q0 of the Coriolis mass flow meter to be corrected obtained in Step 1, calculate the flow coefficient k0 of the Coriolis mass flow meter to be corrected under standard verification conditions.

[0059] Among them, the flow coefficient k0 of the Coriolis mass flow meter to be corrected under standard verification conditions satisfies:

[0060] In formula (1), z0 is the phase difference of the Coriolis mass flow meter to be corrected under standard calibration conditions; z0 is the zero point of the Coriolis mass flow meter to be corrected under standard calibration conditions, where z0 = 0.

[0061] Specifically, after completing step one, proceed to step two. It should be noted that under standard calibration conditions (normal temperature and pressure), the flow coefficient k0 of the Coriolis mass flow meter to be corrected is a constant related to the structural dimensions of the Coriolis mass flow meter (specifically including d0, d1, L, r, etc.) and its physical elastic properties (Young's modulus E). The flow coefficient k0 of the Coriolis mass flow meter to be corrected under these standard calibration conditions can be calculated using equation (1).

[0062] Step 3: Adjust the operating conditions of the Coriolis mass flow meter to be corrected to wide temperature and high pressure conditions; under wide temperature and high pressure conditions, after clearing the flow count of the Coriolis mass flow meter to be corrected to zero, collect the uncorrected instantaneous mass flow rate Q of the Coriolis mass flow meter to be corrected.

[0063] Building upon step two, proceed to step three. It is important to note that the actual operating conditions of the Coriolis mass flow meter to be corrected have changed; at this point, temperature and pressure will cause corresponding changes in the structural dimensions (specifically including d0, d1, L, r, etc.) and physical elastic properties (Young's modulus E) of the Coriolis mass flow meter. For example, Young's modulus E will increase with increasing temperature and pressure; the physical stiffness of the Coriolis mass flow meter will also increase with increasing temperature and pressure.

[0064] Step 4: Based on the uncorrected instantaneous mass flow rate Q of the Coriolis mass flow meter to be corrected obtained in Step 3, calculate the corrected instantaneous mass flow rate Q' of the Coriolis mass flow meter under wide temperature and high pressure conditions.

[0065] Among them, the corrected instantaneous mass flow rate Q' of the Coriolis mass flow meter under wide temperature and high pressure conditions satisfies:

[0066] In equation (2), k is the flow coefficient of the Coriolis mass flow meter to be corrected under wide temperature and high pressure conditions.

[0067] Example 3

[0068] Example 3 includes all the technical features of Example 2. In addition, Example 3 further explains and describes in detail the flow coefficient k of the Coriolis mass flow meter to be corrected (under wide temperature and high pressure conditions) mentioned in step four of Example 2.

[0069] Specifically, through mechanism analysis and simulation experiments, the applicant discovered that the flow coefficient k of the Coriolis mass flow meter to be corrected is a flow coefficient deviation k caused by pressure. P and the flow coefficient deviation k caused by temperature T The result was determined through a joint fitting. Therefore, the deviation k of the flow coefficient caused by pressure was further analyzed. P Flow coefficient deviation k caused by temperature T Conduct experimental analysis.

[0070] In a preferred embodiment of the present invention, the flow coefficient deviation k caused by the pressure is... P ,satisfy:

[0071] When P ≤ 5 MPa, k P =k0[1+0.335×(P-P0)](3);

[0072] When 5 ≤ P ≤ 40 MPa, k P =k0[1+0.000008P 3 -0.0007P 2 +0.0199P+0.0955-0.335P0)](4).

[0073] It should be noted that further research reveals that within the low-pressure range of P ≤ 5 MPa, the pressure-induced deviation of the flow coefficient k... P It shows an almost linear relationship with the real-time pressure value. However, in the high-pressure range of 5 ≤ P ≤ 40 MPa, the pressure-induced deviation of the flow coefficient k... P The relationship between the pressure and the real-time pressure value is no longer linear, but becomes non-linear. For details, please refer to... Figure 3 As shown.

[0074] In a preferred embodiment of the present invention, the flow coefficient deviation k caused by temperature is... T Then the following condition is met:

[0075] k T =k0[1+0.0002×(T-T0)] (5).

[0076] Combining equations (4) and (5), the flow coefficient k of the Coriolis mass flow meter to be corrected can be obtained, satisfying:

[0077] When P ≤ 5 MPa, k = k0[1 + 0.335 × (P - P0) + 0.0002 × (T - T0)] (6);

[0079] When 5 ≤ P ≤ 40 MPa, k = k0[1 + 0.000008P] 3 -0.0007P 2 +0.0199P +0.0955 -0.335P0)

[0080] +0.0002×(T-T0)](7).

[0081] At this point, substituting the calculated flow coefficient k of the Coriolis mass flow meter to be corrected into equation (2) yields the corrected instantaneous mass flow rate Q' of the Coriolis mass flow meter under wide temperature and high pressure conditions. This corrected instantaneous mass flow rate Q' of the Coriolis mass flow meter under wide temperature and high pressure conditions is the basis for technicians to correct the uncorrected instantaneous mass flow rate Q of the Coriolis mass flow meter.

[0082] This invention provides a wide-temperature, high-pressure Coriolis mass flow meter deviation correction system and method. The method includes the following steps: Step 1: Configure standard calibration conditions for the Coriolis mass flow meter to be corrected; collect the instantaneous mass flow rate Q0 of the Coriolis mass flow meter to be corrected; Step 2: Calculate the flow coefficient k0 of the Coriolis mass flow meter to be corrected under the standard calibration conditions; Step 3: Adjust the operating conditions of the Coriolis mass flow meter to be corrected to wide-temperature, high-pressure conditions; collect the uncorrected instantaneous mass flow rate Q of the Coriolis mass flow meter to be corrected; Step 4: Calculate the corrected instantaneous mass flow rate Q' of the Coriolis mass flow meter to be corrected under the wide-temperature, high-pressure conditions.

[0083] The wide-temperature, high-pressure Coriolis mass flow meter deviation correction system and method, possessing the above-described steps, is suitable for real-time correction of zero-point drift and sensitivity deviation defects in Coriolis mass flow meters under wide-temperature and high-pressure operating conditions. Compared with existing technologies, it has at least the following technical advantages:

[0084] (1) The deviation correction method of the Coriolis mass flow meter under wide temperature and high pressure provided by the present invention can simultaneously correct the zero drift and sensitivity deviation defects of the Coriolis mass flow meter under wide temperature and high pressure conditions in real time.

[0085] (2) The wide-temperature and high-pressure Coriolis mass flow meter deviation correction system provided by the present invention can independently complete the deviation correction of the Coriolis mass flow meter under test; during the test, the corresponding (mass flow, temperature and pressure, etc.) working condition information can be displayed in real time, the operation process is simple and the real-time exchange is good.

[0086] (3) The deviation correction method for wide-temperature and high-pressure Coriolis mass flow meters provided by the present invention can adapt to the wide-temperature and high-pressure deviation of Coriolis mass flow meters of different manufacturers, different pipe types and different specifications. The correction model on which it is based is not limited to the linear model and has a wide range of applications.

[0087] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A wide-temperature, high-pressure Coriolis mass flow meter deviation correction system, characterized in that, It includes: front-end shut-off valve, front-end pressure transmitter, rear-end shut-off valve, rear-end pressure transmitter, and flow and temperature monitoring sensor; The front-end shut-off valve and the front-end pressure transmitter are configured on the front-end pipeline of the Coriolis mass flow meter to be corrected; the rear-end shut-off valve, the rear-end pressure transmitter, and the flow and temperature monitoring sensor are configured on the rear-end pipeline of the Coriolis mass flow meter to be corrected.

2. The wide-temperature, high-pressure Coriolis mass flow meter deviation correction system according to claim 1, characterized in that, It also includes: a control unit and a host computer; The control unit is connected to the front-end shut-off valve, the front-end pressure transmitter, the rear-end shut-off valve, the rear-end pressure transmitter, and the flow and temperature monitoring sensor for data communication. The host computer and the control unit can communicate with each other.

3. The wide-temperature, high-pressure Coriolis mass flow meter deviation correction system according to claim 1, characterized in that, It also includes: an inlet buffer tank located at the front end of the Coriolis mass flow meter to be corrected, and an outlet buffer tank located at the rear end of the Coriolis mass flow meter to be corrected.

4. A method for correcting the deviation of a wide-temperature, high-pressure Coriolis mass flow meter, characterized in that, The steps include the following: Step 1: Configure standard calibration conditions for the Coriolis mass flow meter to be corrected; Under standard calibration conditions, after zeroing the flow count of the Coriolis mass flow meter to be corrected, the instantaneous mass flow rate Q0 of the Coriolis mass flow meter to be corrected is collected. Step 2: Based on the instantaneous mass flow rate Q0 of the Coriolis mass flow meter to be corrected obtained in Step 1, calculate the flow coefficient k0 of the Coriolis mass flow meter to be corrected under standard verification conditions. Among them, the flow coefficient k0 of the Coriolis mass flow meter to be corrected under standard verification conditions satisfies: In formula (1), z is the phase difference of the Coriolis mass flow meter to be corrected under standard verification conditions; z0 is the zero point of the Coriolis mass flow meter to be corrected under standard verification conditions, where z0 = 0. Step 3: Adjust the operating conditions of the Coriolis mass flow meter to be corrected to wide temperature and high pressure conditions; under wide temperature and high pressure conditions, after clearing the flow count of the Coriolis mass flow meter to be corrected to zero, collect the uncorrected instantaneous mass flow rate Q of the Coriolis mass flow meter to be corrected. Step 4: Based on the uncorrected instantaneous mass flow rate Q of the Coriolis mass flow meter to be corrected obtained in Step 3, calculate the corrected instantaneous mass flow rate Q' of the Coriolis mass flow meter under wide temperature and high pressure conditions. Among them, the corrected instantaneous mass flow rate Q' of the Coriolis mass flow meter under wide temperature and high pressure conditions satisfies: In equation (2), k is the flow coefficient of the Coriolis mass flow meter to be corrected under wide temperature and high pressure conditions.

5. The method for correcting deviations in a wide-temperature, high-pressure Coriolis mass flow meter according to claim 4, characterized in that, The Coriolis mass flow meter flow coefficient k to be corrected in step four is the flow coefficient deviation k caused by pressure. P and the flow coefficient deviation k caused by temperature T Determined by co-fitting.

6. The method for correcting deviations in a wide-temperature, high-pressure Coriolis mass flow meter according to claim 4, characterized in that, Pressure-induced deviation in flow coefficient k P ,satisfy: When P ≤ 5 MPa, k P =k0[1+0.335×(P-P0)](3); When 5 ≤ P ≤ 40 MPa, k P =k0[1+0.000008P 3 -0.0007P 2 +0.0199P+0.0955-0.335P0)](4).

7. The method for correcting deviations in a wide-temperature, high-pressure Coriolis mass flow meter according to claim 4, characterized in that, Temperature-induced deviation in flow coefficient k T ,satisfy: k T =k0[1+0.0002×(T-T0)] (5)。 8. The method for correcting deviations in a wide-temperature, high-pressure Coriolis mass flow meter according to claim 4, characterized in that, The flow coefficient k of the Coriolis mass flow meter to be corrected satisfies: When P≤5MPa, k=k0[1+0.335×(P-P0)+0.0002×(T-T0)](6); When 5 ≤ P ≤ 40 MPa, k = k0[1 + 0.000008P] 3 -0.0007P 2 +0.0199P +0.0955 -0.335P0) +0.0002×(T-T0)](7).

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