Correction method and system for gas volume flow measurement instrument used in flash evaporation process

Abstract

The embodiment of the present invention discloses a correction method and system for a gas volume flow measurement instrument for a flash evaporation process, which belongs to the field of oil refining and chemical industry. The method includes: obtaining the gas properties of the flash evaporation mixed gas after the composition changes at different temperatures and pressures of the flash evaporation equipment; based on the obtained gas properties, forming multiple three-dimensional matrix data about temperature, pressure, and gas properties; using the obtained three-dimensional matrix data, obtaining the gas properties of the flash evaporation mixed gas at the actual temperature and pressure of the flash evaporation equipment as calculation parameters of the gas volume flow measurement instrument; correcting the measurement results of the gas volume flow measurement instrument according to the calculation parameters to obtain a corrected flow measurement value. This method corrects the instrument measurement error caused by the composition change, and improves the measurement accuracy of the volume flow measurement of the mixed gas generated by the flash evaporation process at a low cost.

Description

Technical Field

[0001] The embodiments of the present invention relate to the fields of oil refining and chemical industry, and in particular to a correction method and system for a gas volume flow measuring instrument for a flash process. Background Art

[0002] In the oil refining and chemical industries, gas volume flow meters are widely used as the most economical measuring instruments. However, these instruments are only effective for measuring gases with a fixed composition at the design temperature and pressure. During production, scaling of cooling equipment, temperature fluctuations between winter and summer, and daytime and nighttime, can all lead to variations in cooling efficiency. Adjustments to production loads can also cause changes in the temperature and pressure after cooling. When operating temperature and pressure differ from the design conditions, the gas volume flow meter can produce measurement errors far greater than the instrument's inherent accuracy.

[0003] Currently, for single-component gases and mixed gases with constant composition, temperature and pressure compensation corrections for parameters such as density and viscosity can be performed based on thermodynamic equations to improve measurement accuracy when temperature and pressure change. However, in flash evaporation processes, changes in the operating temperature and pressure of the vapor-liquid separation equipment also cause changes in the gas phase composition. To address this issue, upgraded measuring instruments, such as gas mass flow meters, are currently being used in critical, low-volume, high-demand applications.

[0004] However, because gas mass flowmeters significantly increase measurement costs, most processes still rely on volumetric flowmeters. However, there is no method for compensating for the temperature and pressure fluctuations in flash evaporation processes that cause changes in gas phase composition. This results in significant measurement errors, leading to significant deviations in material balances and inaccurate process control. Therefore, it is necessary to provide a correction method for flash evaporation gas volumetric flowmeters. Summary of the Invention

[0005] The present invention provides a method and system for correcting a flash evaporation gas volume flow meter, which can solve the above-mentioned problems. The technical solution is as follows:

[0006] A method for correcting a gas volume flow measuring instrument for a flash evaporation process, the method comprising:

[0007] Obtain the gas properties of the flash mixed gas after the composition changes at different temperatures and pressures in the flash evaporation equipment;

[0008] Based on the gas properties of the flash mixed gas, a plurality of three-dimensional matrix data on temperature, pressure, and gas properties are generated;

[0009] Using the three-dimensional matrix data, obtaining gas properties of the flash vaporized mixed gas at actual temperature and pressure in the flash vaporization equipment, and using the obtained gas properties as calculation parameters of a gas volume flow measurement instrument;

[0010] The measurement result of the gas volume flow measuring instrument is corrected according to the calculation parameters to obtain a corrected flow measurement value.

[0011] In one possible embodiment, obtaining the gas properties of the flash mixed gas after the composition changes at different temperatures and pressures of the flash evaporation device includes:

[0012] Using simulation software to simulate the change of gas composition of the flash mixed gas with temperature and pressure during the production process of the flash equipment, and obtaining the required composition of the flash mixed gas at different temperatures and pressures;

[0013] Based on the components of the flash mixed gas, properties of the flash mixed gas at corresponding temperature and pressure are calculated.

[0014] Optionally, the simulation calculation method using simulation software to simulate the change process of the gas composition of the flash mixed gas with the change of temperature and pressure during the production process of the flash equipment to obtain the desired composition of the flash mixed gas at different temperatures and pressures includes:

[0015] Cross-multiply m temperature values ​​with n pressure values ​​to obtain m*n calculation points. The range of the calculation points should cover the range of changes that may occur in the actual production process;

[0016] The components of the flash mixed gas after the component changes corresponding to the m*n calculation points are simulated by the simulation calculation software, where both m and n are positive integers greater than 1.

[0017] Optionally, the properties of the flash mixed gas at corresponding temperature and pressure calculated based on the components of the flash mixed gas include at least one of density, viscosity, compressibility, and adiabatic index.

[0018] Optionally, the sizes of the multiple three-dimensional matrix data on temperature, pressure, and gas properties formed based on the gas properties of the flash vaporized mixed gas are determined by the number of calculation points and the number of gas properties.

[0019] In one possible implementation, the method of using the three-dimensional matrix data to obtain gas properties of the flash vaporization mixed gas at the actual temperature and pressure of the flash vaporization equipment, and using the obtained gas properties as calculation parameters of a gas volume flow measurement instrument, includes:

[0020] Acquiring in real time a temperature value and a pressure value during the production process of the flash evaporation equipment, wherein the temperature value and the pressure value belong to a calculation point in the three-dimensional matrix data;

[0021] The gas properties corresponding to the calculation points in the three-dimensional matrix data are obtained, and the obtained gas properties are used as calculation parameters of a gas volume flow measurement instrument.

[0022] In one possible implementation, the method of using the three-dimensional matrix data to obtain gas properties of the flash vaporization mixed gas at the actual temperature and pressure of the flash vaporization equipment, and using the obtained gas properties as calculation parameters of a gas volume flow measurement instrument, includes:

[0023] Acquiring in real time a temperature value and a pressure value during the production process of the flash evaporation equipment, wherein the temperature value and the pressure value do not belong to a calculation point in the three-dimensional matrix data;

[0024] The three-dimensional matrix data is used to calculate the gas properties of the flash mixed gas of the flash evaporation equipment after the temperature and pressure values ​​are changed by interpolation method, and the obtained gas properties are used as calculation parameters of the gas volume flow measurement instrument.

[0025] A flash process gas volume flow measurement instrument correction system, the system comprising:

[0026] The first acquisition unit is used to obtain gas properties of the flash vaporized mixed gas after the composition changes at different temperatures and pressures of the flash vaporization equipment;

[0027] a data generating unit, configured to generate a plurality of three-dimensional matrix data on temperature, pressure, and gas properties based on the gas properties of the flash vaporized mixed gas;

[0028] a second acquisition unit, configured to acquire gas properties of the flash vaporized mixed gas at actual temperature and pressure of the flash vaporization equipment using the three-dimensional matrix data, and use the acquired gas properties as calculation parameters of the gas volume flow measurement instrument;

[0029] The correction unit is used to correct the measurement result of the gas volume flow measuring instrument according to the calculation parameters to obtain a corrected flow measurement value.

[0030] In a possible embodiment, the first acquisition unit is configured to use simulation software to perform simulation calculations to simulate the change of gas composition of the flash mixed gas as temperature and pressure change during the production process of the flash equipment, thereby obtaining the desired composition of the flash mixed gas at different temperatures and pressures.

[0031] Based on the components of the flash mixed gas, properties of the flash mixed gas at corresponding temperature and pressure are calculated.

[0032] Optionally, the first acquisition unit is used to cross-multiply m temperature values ​​with n pressure values ​​to obtain m*n calculation points, and the range of the calculation points should cover the range of changes that may occur in the actual production process;

[0033] The components of the flash mixed gas after the component changes corresponding to the m*n calculation points are simulated by the simulation calculation software, where both m and n are positive integers greater than 1.

[0034] Optionally, the properties of the flash mixed gas at corresponding temperature and pressure calculated based on the components of the flash mixed gas include at least one of density, viscosity, compressibility, and adiabatic index.

[0035] Optionally, the sizes of the multiple three-dimensional matrix data on temperature, pressure, and gas properties formed based on the gas properties of the flash vaporized mixed gas are determined by the number of calculation points and the number of gas properties.

[0036] In a possible implementation, the second acquisition unit is used to acquire in real time a temperature value and a pressure value during the production process of the flash evaporation equipment, where the temperature value and the pressure value belong to a calculation point in the three-dimensional matrix data;

[0037] The gas properties corresponding to the calculation points in the three-dimensional matrix data are obtained, and the obtained gas properties are used as calculation parameters of a gas volume flow measurement instrument.

[0038] In a possible implementation, the second acquisition unit is used to acquire in real time a temperature value and a pressure value during the production process of the flash evaporation equipment, wherein the temperature value and the pressure value do not belong to a calculation point in the three-dimensional matrix data;

[0039] The three-dimensional matrix data is used to calculate the gas properties of the flash mixed gas of the flash evaporation equipment after the temperature and pressure values ​​are changed by interpolation method, and the obtained gas properties are used as calculation parameters of the gas volume flow measurement instrument.

[0040] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0041] By simulating and calculating the actual components and properties of flash vaporized mixed gases at different temperatures and pressures, the large measurement errors of gas volume measuring instruments caused by component changes were corrected, and the accuracy of volume measuring instruments for mixed gases produced by flash vaporization equipment was improved at low cost, filling the gap in this technology and laying a good foundation for material metering, process control, etc. It is of universal and important significance in the petroleum refining and chemical industries, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 This is a flow chart of a correction method for a gas volume flow measuring instrument for a flash evaporation process provided by an embodiment of the present invention;

[0044] Figure 2 The present invention provides a structural diagram of a flash process gas volume flow measurement instrument correction system. DETAILED DESCRIPTION

[0045] Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meanings as those commonly understood by those skilled in the art. To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0046] First, the application scenarios of the embodiments of the present invention are introduced.

[0047] Flash evaporation is a process whereby a high-pressure, saturated liquid enters a relatively low-pressure container and, due to the sudden drop in pressure, the saturated liquid rapidly vaporizes, separating the gas and liquid phases. Alternatively, a two-phase material enters the container and becomes partially saturated vapor and saturated liquid at the container pressure. This flash evaporation process can be used as a production process in oil refining or chemical industries.

[0048] In flash evaporation production, flow measurement of the flash gas mixture is essential. Gas volume flowmeters are widely used due to their economical nature. Gas volume flow rate refers to the volume of gas flowing through a pipeline per unit time. Since gas volume varies with temperature and pressure, the gas volume flow rate varies with process operating temperature and pressure. Temperature and pressure compensation can be used to correct flowmeter measurement errors. However, since the operating temperature and pressure of the vapor-liquid separation equipment fluctuate during the flash evaporation process, the amounts of the various components in the flash gas mixture also change. Even after correction, current gas volume flowmeters still exhibit significant measurement errors, leading to significant deviations in material balances and inaccurate process control. For example, the balance between gas production and gas consumption in fuel gas systems can vary by as much as 15% to 30%. The measurement of circulating hydrogen flow in hydrogenation systems exhibits significant deviations, resulting in a generally high hydrogen-to-oil ratio.

[0049] The embodiment of the present invention provides a method for correcting a gas volume flow measuring instrument for a flash evaporation process, such as Figure 1 As shown, the method includes:

[0050] Step S1: obtaining gas properties of a flash vaporized mixed gas after composition changes at different temperatures and pressures in a flash vaporization device.

[0051] Optionally, in step S1, obtaining the gas properties of the flash mixed gas after the composition of the flash evaporation equipment changes at different temperatures and pressures includes: using simulation calculation software to perform simulation calculations to simulate the gas composition change process of the mixed gas as the temperature and pressure change during the production process of the flash evaporation equipment, and obtaining the required components of the flash mixed gas at different temperatures and pressures; based on the obtained flash mixed gas components, calculating the properties of the flash mixed gas at the corresponding temperature and pressure.

[0052] Optionally, simulation software is used to simulate the change of gas composition of the flash mixed gas as the temperature and pressure change during the production process of the flash equipment, and the desired composition of the mixed gas at different temperatures and pressures is obtained, including:

[0053] Cross-multiply m temperature values ​​and n pressure values ​​to obtain m*n calculation points, where the range of the calculation points should cover the range of changes that may occur in the actual production process; obtain the components of the mixed gas after the component changes corresponding to the m*n calculation points through simulation calculation software, where m and n are both positive integers greater than 1.

[0054] Optionally, simulation calculation software includes: Pro II, Aspen Plus, HYSYS, etc.

[0055] For example, based on the characteristics of different physical systems, suitable simulation software is used to simulate and calculate the gas properties of the flash mixed gas after the composition changes at different temperatures and pressures in the flash evaporation equipment, including:

[0056] Step S101: Select appropriate flash mixed gas components, appropriate thermodynamic equations, flash equipment model and other parameters in the simulation calculation software operation interface.

[0057] Among them, the selection of appropriate flash gas mixture components is determined by actual work needs, that is, the flash gas mixture components that may be produced under different production conditions; thermodynamic equations are used to calculate the gas properties of the flash gas mixture, and appropriate thermodynamic equations are selected according to different components; the flash equipment model is used to define the type of flash equipment. Different types represent different flash performances, and the resulting changes in the components of the flash gas mixture are also different.

[0058] Step S102: Then input data such as flow rate and multiple temperature values ​​and multiple pressure values ​​within the required variation range to obtain multiple corresponding calculation points.

[0059] Among them, the input flow data is used to calculate the gas properties; the temperature and pressure data within the required variation range are input, that is, multiple sets of temperature values ​​and pressure values ​​are input, and cross-multiplied to form multiple calculation points. The range of all calculation points should be able to cover the range of changes that may occur in the actual production process.

[0060] For example, in a flash evaporation condition, the possible temperature variation range is 0-40°C, and the possible pressure variation range is 20-80kPa. Optionally, set 5 temperature calculation points as: 0°C, 10°C, 20°C, 30°C, 40°C, set 4 pressure calculation points as: 20kPa, 40kPa, 60kPa, 80kPa; based on the set 5 temperature calculation points and 4 pressure calculation points, cross-multiply each other, a total of 20 calculation points can be obtained: (0°C, 20kPa), (0°C, 40kPa), (0°C, 60kPa), (0°C, 80kPa), (10°C, 20kPa), (10°C, 4 All the above calculation points cover the range of changes that may occur in the actual production process.

[0061] Step S103: Based on the obtained multiple corresponding calculation points, simulation calculations are performed one by one to obtain different components of the flash vaporized mixed gas corresponding to different temperatures and different pressures.

[0062] For example, based on the 20 calculation points obtained from 5 temperature calculation points and 4 pressure calculation points, for any calculation point, the simulation calculation software simulates the components of the flash mixed gas after the component changes corresponding to the calculation point by inputting the flash mixed gas components, flow data and flash equipment model.

[0063] Step S104: Calculate the properties of the flash vaporized mixed gas at the corresponding temperature and pressure based on the obtained components of the flash vaporized mixed gas.

[0064] The calculated properties of the flash gas mixture at different temperatures and pressures include at least one of density, viscosity, compressibility, and adiabatic index. Instruments of different types (principles) require different parameter types and quantities, and different calculation methods. This embodiment does not limit the calculation and correction methods.

[0065] Step S2: Based on the gas properties of the flash vaporized mixed gas, a plurality of three-dimensional matrix data on temperature, pressure, and gas properties are generated.

[0066] Optionally, in step S2, based on the gas properties of the flash mixed gas, a plurality of three-dimensional matrix data on temperature, pressure, and gas properties are formed, including: under different flash operating conditions, according to the different components of the flash mixed gas generated, the different types of flash equipment, and the different ranges of temperature and pressure changes, several groups of different gas property data corresponding to temperature and pressure are obtained, and the temperature, pressure, and gas property data are matched one by one to obtain a plurality of three-dimensional matrix data on temperature, pressure, and gas properties.

[0067] Among them, based on the gas properties of the flash mixed gas, the size of multiple three-dimensional matrix data on temperature, pressure, and gas properties is determined by the number of calculation points and the number of gas properties.

[0068] For example, based on the example in step S1, 5 temperature calculation points and 4 pressure calculation points are input to obtain a total of 20 calculation points. The gas properties of different mixed gas components corresponding to each calculation point are calculated by selecting appropriate thermodynamic equations and related parameters, which are expressed as F mn [D mn ,V mn ],m∈[1,5],n∈[1,4]. Among them, m represents the number of temperature calculation points, n represents the number of pressure calculation points, D represents the gas density, and V represents the gas viscosity. For example, F 11 [D 11 ,V 11 ] represents the gas properties of the flash mixed gas after the composition change corresponding to the calculation point (0℃, 20kPa), F 54 [D 54 ,V 54 ] represents the gas properties of the flash mixed gas after the composition change corresponding to the calculation point (40℃, 80kPa).

[0069] Optionally, the gas properties of all calculated points are stored in their corresponding coordinate positions to form a 5*4*2 three-dimensional matrix, represented as F(5,4,2). This three-dimensional matrix data is used in actual working conditions to calculate the gas properties of a flash gas mixture whose components vary with temperature and pressure.

[0070] Step S3: using the obtained three-dimensional matrix data, obtain the gas properties of the flash mixed gas at the actual temperature and pressure of the flash equipment, and use the obtained gas properties as calculation parameters of the gas volume flow measurement instrument.

[0071] Optionally, in step S3, the obtained three-dimensional matrix data is used to obtain gas properties of the flash mixed gas at actual temperature and pressure, and the obtained gas properties are used as calculation parameters of the gas volume flow measurement instrument, including:

[0072] Real-time acquisition of temperature and pressure values ​​during the flash evaporation equipment production process, where the temperature and pressure values ​​belong to a calculation point in the three-dimensional matrix data;

[0073] The gas properties corresponding to the calculation points in the three-dimensional matrix data are obtained, and the obtained gas properties are used as calculation parameters of the gas volume flow measurement instrument.

[0074] For example, based on the example in step S1, using the obtained three-dimensional matrix data with 20 calculation points, obtaining the gas properties at actual temperature and pressure includes:

[0075] The calculation point composed of the actual measured temperature and pressure values ​​belongs to one of the 20 calculation points. For example, if the measured temperature is 0°C and the measured pressure is 20kPa, then the calculated gas properties of the flash mixed gas of the current component are F 11 [D 11 ,V 11 ], that is, the gas properties corresponding to the calculation point (0℃, 20kPa) in the three-dimensional matrix data.

[0076] Optionally, in step S3, the obtained three-dimensional matrix data is used to obtain gas properties of the flash mixed gas at actual temperature and pressure, and the obtained gas properties are used as calculation parameters of the gas volume flow measurement instrument, including:

[0077] Real-time acquisition of temperature and pressure values ​​during the production process of the flash evaporation equipment, where the temperature and pressure values ​​do not belong to a calculation point in the three-dimensional matrix data;

[0078] The gas properties of the flash mixed gas after the temperature and pressure values ​​of the flash evaporation equipment are calculated by interpolation method using three-dimensional matrix data, and the obtained gas properties are used as calculation parameters of the gas volume flow measurement instrument.

[0079] The temperature value is measured by a temperature meter in the flash evaporation equipment, and the pressure value is measured by a pressure meter in the flash evaporation equipment.

[0080] Optionally, the interpolation method uses linear interpolation, the principle of which is to use a set of known unknown function independent variable values ​​and their corresponding function values, and use geometric relationships to approximate the other values ​​of the unknown function. It is a solution method for finding the approximate value of an unknown function.

[0081] For example, based on the example in step S1, using the obtained three-dimensional matrix data with 20 calculation points, obtaining the gas properties at actual temperature and pressure includes:

[0082] The calculation point formed by the actual measured temperature and pressure values ​​is not one of the 20 calculation points. For example, if the measured temperature is 5°C and the measured pressure is 30kPa, use linear interpolation to connect the two sets of closest known independent variable values ​​(0°C, 20kPa) and (10°C, 40kPa) into a straight line. Use the geometric relationship to solve the function value at the point (5°C, 30kPa) on the connected line, which is the gas property of the flash vapor mixture of the current component.

[0083] Step S4: Correct the measurement result of the gas volume flow meter according to the calculation parameters to obtain a corrected flow measurement value.

[0084] Optionally, in step S4, since the gas volume flow meter is designed, manufactured, or calibrated according to design process conditions, the flow equations for different types of gas volume flow meters vary, but all are related to the gas properties. Therefore, obtaining the gas properties of the actual component mixed gas under production conditions at a certain temperature and pressure can correct the measurement error of the gas volume flow meter.

[0085] The correction method for the volume flow measurement instrument of the mixed gas generated by the flash evaporation process provided in the embodiment of the present invention first simulates the flash gas components of the mixed gas of the specific components of the flash evaporation equipment at different temperatures and pressures; then calculates the corresponding gas properties to form a plurality of three-dimensional matrix data of temperature, pressure, and gas properties; finally, based on these three-dimensional matrix data, uses the interpolation method to obtain the gas properties at the actual temperature and pressure, and uses the obtained gas properties as the calculation parameters of the gas volume flow measurement instrument to obtain the corrected flow measurement value. Compared with the correction method in the related art that does not consider the change of the mixed gas components, the embodiment of the present invention can obtain the gas properties of the mixed gas after the components change with temperature and pressure in real time, thereby improving the accuracy of the volume flow measurement instrument of the mixed gas generated by the flash evaporation process. At the same time, the gas volume flow measurement instrument is directly corrected instead of upgrading the instrument, which reduces the metering cost and fills the gap in this type of technology.

[0086] The embodiment of the present invention provides a flash process gas volume flow measurement instrument correction system 20, such as Figure 2 As shown, the system includes:

[0087] The first acquisition unit 21 is used to obtain gas properties of the flash mixed gas after the composition changes at different temperatures and pressures of the flash equipment;

[0088] The data generating unit 22 is used to generate a plurality of three-dimensional matrix data on temperature, pressure, and gas properties based on the gas properties of the flash mixed gas;

[0089] The second acquisition unit 23 is used to obtain the gas properties of the flash mixed gas at the actual temperature and pressure of the flash equipment using the three-dimensional matrix data, and use the obtained gas properties as calculation parameters of the gas volume flow measurement instrument;

[0090] The correction unit 24 is used to correct the measurement result of the gas volume flow measuring instrument according to the calculation parameters to obtain a corrected flow measurement value.

[0091] Optionally, the first acquisition unit 21 is used to: use simulation calculation software to perform simulation calculations to simulate the change process of the gas composition of the mixed gas as the temperature and pressure change during the production process of the flash equipment, and obtain the required components of the flash mixed gas at different temperatures and pressures; based on the obtained components of the flash mixed gas, calculate the properties of the flash mixed gas at the corresponding temperature and pressure.

[0092] In a possible implementation, the first acquisition unit 21 is configured to cross-multiply m temperature values ​​with n pressure values ​​to obtain m*n calculation points. The range of the calculation points should be able to cover the range of changes that may occur in the actual production process.

[0093] The components of the flash mixed gas after the component changes corresponding to m*n calculation points are simulated by simulation calculation software, where m and n are both positive integers greater than 1.

[0094] Optionally, based on the components of the flash mixed gas, the calculated properties of the flash mixed gas at the corresponding temperature and pressure include at least one of density, viscosity, compressibility, and adiabatic index.

[0095] Optionally, based on the gas properties of the flash vaporized mixed gas, the sizes of the multiple three-dimensional matrix data on temperature, pressure, and gas properties are determined by the number of calculation points and the number of gas properties.

[0096] In a possible implementation, the second acquisition unit 23 is configured to: acquire in real time the temperature value and the pressure value during the production process of the flash evaporation equipment, wherein the temperature value and the pressure value belong to a calculation point in the three-dimensional matrix data;

[0097] The gas properties corresponding to the calculation points in the three-dimensional matrix data are obtained, and the obtained gas properties are used as calculation parameters of the gas volume flow measurement instrument.

[0098] In a possible implementation, the second acquisition unit 23 is configured to: acquire in real time the temperature value and the pressure value during the production process of the flash evaporation equipment, wherein the temperature value and the pressure value do not belong to a calculation point in the three-dimensional matrix data;

[0099] The gas properties of the flash mixed gas after the temperature and pressure values ​​of the flash evaporation equipment are calculated by interpolation method using three-dimensional matrix data, and the obtained gas properties are used as calculation parameters of the gas volume flow measurement instrument.

[0100] The present invention provides a correction system for flash process gas volume flow meter instruments. This system uses simulation calculations to calculate the actual flash gas mixture composition and corresponding gas properties after compositional changes at different temperatures and pressures. These calculation parameters are provided to the flow meter as calculation parameters to correct instrument measurement errors caused by compositional changes. This system requires no hardware investment, requiring only simulation calculation algorithms and three-dimensional matrix data. It can be implemented using existing integrated control systems such as DCS or computer terminal programming. This system achieves low-cost improvements in the accuracy of flash process gas volume flow meter instruments, laying a solid foundation for material metering and process control. It is of broad significance in the petroleum refining and chemical industries and holds broad application prospects.

[0101] It should be understood that the above Figure 2 The system provided herein is illustrated by the division of the aforementioned functional modules when implementing its functions. In actual applications, the aforementioned functions can be assigned to different functional modules as needed, i.e., the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. Furthermore, the system and method embodiments provided in the aforementioned embodiments share the same concept. The specific implementation process is detailed in the method embodiments and will not be further elaborated here.

[0102] In an exemplary embodiment, a computer-readable storage medium is also provided, which stores at least one program code, and the at least one program code is loaded and executed by a processor to enable a computer to implement any of the above-mentioned methods for correcting a gas volume flow measurement instrument for a flash evaporation process.

[0103] Optionally, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a compact disc (CD-ROM), a magnetic tape, a floppy disk, an optical data storage device, or the like.

[0104] In an exemplary embodiment, a computer program or computer program product is also provided, in which at least one computer instruction is stored. The at least one computer instruction is loaded and executed by a processor to enable a computer to implement any of the above-mentioned methods for correcting a gas volume flow measurement instrument for a flash process.

[0105] The above description is merely an illustrative embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for correcting a gas volume flow measuring instrument for a flash evaporation process, characterized in that: The method comprises: Select the flash mixed gas components, thermodynamic equations, and flash equipment model in the simulation software operation interface; Input flow rate; input m temperature values ​​and n pressure values ​​within the required variation range, cross-select the m temperature values ​​and the n pressure values ​​to obtain m×n calculation points, where the range of the calculation points covers the temperature and pressure variation range that occurs in the actual production process; simulating the composition of the flash mixed gas after the composition changes corresponding to the m×n calculation points by the simulation calculation software, wherein both m and n are positive integers greater than 1; Calculating the gas properties of the flash mixed gas at corresponding temperature and pressure based on the components of the flash mixed gas; Based on the gas properties of the flash mixed gas, a plurality of three-dimensional matrix data on temperature, pressure, and gas properties are generated; Acquiring in real time a temperature value and a pressure value during the production process of the flash evaporation equipment, wherein the temperature value and the pressure value do not belong to a calculation point in the three-dimensional matrix data; In a control system or a computer coding program, the three-dimensional matrix data is used to calculate, by interpolation, the gas properties of the flash vaporized mixed gas of the flash vaporization device after the temperature and pressure values ​​are changed, and the obtained gas properties are used as calculation parameters of a gas volume flow measurement instrument; The measurement result of the gas volume flow measuring instrument is corrected according to the calculation parameters to obtain a corrected flow measurement value.

2. The method according to claim 1, characterized in that The properties of the flash mixed gas at corresponding temperature and pressure calculated based on the components of the flash mixed gas include at least one of density, viscosity, compressibility, and adiabatic index.

3. The method according to claim 1, characterized in that The sizes of the multiple three-dimensional matrix data on temperature, pressure, and gas properties formed based on the gas properties of the flash vaporized mixed gas are determined by the number of calculation points and the number of gas properties.

4. The method according to any one of claims 1 to 3, characterized in that The method further comprises: Acquiring in real time a temperature value and a pressure value during the production process of the flash evaporation equipment, wherein the temperature value and the pressure value belong to a calculation point in the three-dimensional matrix data; The gas properties corresponding to the calculation points in the three-dimensional matrix data are obtained, and the obtained gas properties are used as calculation parameters of a gas volume flow measurement instrument.

5. A flash process gas volume flow measurement instrument correction system, characterized in that: The system comprises: The first acquisition unit is used to select the flash mixed gas components, thermodynamic equations, and flash equipment model in the simulation calculation software operation interface; input the flow rate; input m temperature values ​​and n pressure values ​​within the required variation range, cross-select the m temperature values ​​and the n pressure values ​​to obtain m×n calculation points, where the range of the calculation points covers the temperature and pressure variation range that occurs in the actual production process; simulate the components of the flash mixed gas after the component changes corresponding to the m×n calculation points using the simulation calculation software, where m and n are both positive integers greater than 1; and calculate the gas properties of the flash mixed gas at the corresponding temperature and pressure based on the components of the flash mixed gas; a data generating unit, configured to generate a plurality of three-dimensional matrix data on temperature, pressure, and gas properties based on the gas properties of the flash vaporized mixed gas; a second acquisition unit configured to acquire, in real time, temperature and pressure values ​​during the production process of the flash evaporation equipment, the temperature and pressure values ​​not belonging to a calculation point in the three-dimensional matrix data; and, in a control system or a computer coding program, to calculate, using an interpolation method, gas properties of the flash vaporized mixed gas of the flash evaporation equipment after the temperature and pressure values ​​have changed, and to use the obtained gas properties as calculation parameters of the gas volume flow measurement instrument; The correction unit is used to correct the measurement result of the gas volume flow measuring instrument according to the calculation parameters to obtain a corrected flow measurement value.

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