Experimental device and method for measuring viscosity of impurity-containing supercritical carbon dioxide

Abstract

The invention discloses an experimental device for measuring viscosity of supercritical carbon dioxide containing impurities. The experimental device comprises a high-pressure kettle with a stirrer, an inner cavity of the high-pressure kettle is connected with a carbon dioxide supply system, a gas discharge system and a plurality of impurity gas supply systems for supplying different impurity gases; a viscometer is arranged on the inner wall of the high-pressure kettle; a temperature sensor for detecting the temperature of the inner cavity and a pressure sensor for detecting the pressure of the inner cavity are arranged in the high-pressure kettle. The invention also discloses an experimental method for measuring the viscosity of the impurity-containing supercritical carbon dioxide. According to the invention, the viscosity data of the supercritical carbon dioxide under different working conditions and different types of impurity gases can be obtained, and the data can be used for exploring the viscosity change rule of the supercritical carbon dioxide under the conditions of different types of impurity gases and different contents of impurity gases. And parameter support can be provided for the thermodynamic calculation process of the supercritical carbon dioxide pipe water delivery force.

Description

Technical Field

[0001] The present invention belongs to the technical field of measuring physical property parameters of carbon dioxide, and particularly relates to an experimental device and method for measuring the viscosity of supercritical carbon dioxide containing impurities. Background Art

[0002] Compared with other transportation methods, carbon dioxide pipeline transportation has the advantages of small land occupation area, large transportation volume, and few restrictions; at the same time, the transportation process of carbon dioxide pipeline transportation is airtight and can operate continuously and stably for a long time, which is the lowest-cost transportation method on land.

[0003] During the pipeline transportation of carbon dioxide, density and viscosity are important factors affecting the economy of pipeline transportation. Since the density of supercritical carbon dioxide (temperature ≥ 31.1 °C and pressure ≥ 7.38 MPa) is comparable to that of liquid carbon dioxide, and the viscosity is comparable to that of gaseous carbon dioxide. From an economic perspective, the supercritical state is the best phase state for pipeline transportation of carbon dioxide. The density of supercritical carbon dioxide is close to that of a liquid while its fluidity is close to that of a gas, having the dual characteristics of both gas and liquid, resulting in obvious differences in the hydrodynamic and thermodynamic calculation methods of supercritical carbon dioxide from those of gas and liquid states.

[0004] The physical property parameters of carbon dioxide are sensitive to temperature, and sudden changes will occur in its physical property parameters near the critical region. In addition, due to different carbon sources or capture methods, the pipeline transportation process and impurities of carbon dioxide are also different, which will have a series of effects on the hydrodynamic and thermodynamic characteristics of the pipeline. If the operation is improper, various dangerous situations such as pipeline ice blockage, slug flow, and water hammer will occur.

[0005] Therefore, obtaining the physical property parameters of supercritical carbon dioxide is very important for the study of the hydrodynamic and thermodynamic properties in carbon dioxide pipeline transportation. Among them, viscosity is an important physical property parameter of supercritical carbon dioxide.

[0006] Based on this, the present application proposes an experimental device and method for measuring the viscosity of supercritical carbon dioxide containing impurities, which can obtain the viscosity data of supercritical carbon dioxide under different working conditions and conditions of impurity gases with different contents and types. These data can be used to explore the viscosity change law of supercritical carbon dioxide under conditions of different types and contents of impurity gases, and can also provide parameter support for the hydrodynamic and thermodynamic calculation process of supercritical carbon dioxide pipeline transportation. Summary of the Invention

[0007] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide an experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities.

[0008] To achieve the above purpose, the present invention adopts the following technical solutions:

[0009] An experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities, comprising an autoclave with a stirrer;

[0010] The inner cavity of the autoclave is connected to a carbon dioxide supply system, a gas discharge system, and several impurity gas supply systems for providing different impurity gases;

[0011] A viscometer is provided on the inner wall of the autoclave;

[0012] A temperature sensor for detecting the temperature of the inner cavity and a pressure sensor for detecting the pressure of the inner cavity are provided in the autoclave.

[0013] Preferably, the autoclave includes an autoclave body and an autoclave lid;

[0014] The autoclave lid is in sealing fit with the autoclave body.

[0015] Preferably, a first annular cavity is provided in the cylindrical side wall of the autoclave body, and the first annular cavity is connected by a pipeline to a first constant temperature water tank for providing hot water.

[0016] Preferably, a heat insulation layer is provided on the outer wall surface of the cylindrical side wall of the autoclave body.

[0017] Preferably, the stirrer includes a stirring paddle located in the inner cavity of the autoclave body;

[0018] A transmission shaft is fixedly provided in the middle of the upper side of the stirring paddle, and the transmission shaft is coaxially arranged with the autoclave body;

[0019] The top end of the transmission shaft passes upward through the autoclave lid and is fixedly and coaxially connected to the output shaft of a stirring motor;

[0020] The stirring motor is fixedly provided on the autoclave lid.

[0021] Preferably, a temperature control component is provided outside the transmission shaft located in the inner cavity of the autoclave body;

[0022] The temperature control component has a cylindrical structure, and a second annular cavity is provided in the middle of the temperature control component. The second annular cavity is connected by a pipeline to a second constant temperature water tank;

[0023] The top end of the temperature control component is fixedly connected to the bottom end of the autoclave lid.

[0024] Preferably, the carbon dioxide supply system includes a carbon dioxide gas cylinder;

[0025] The outlet of the carbon dioxide gas cylinder is connected to the inlet of a carbon dioxide delivery pump, and the outlet of the carbon dioxide delivery pump is connected to a carbon dioxide delivery pipe communicating with the inner cavity of the autoclave.

[0026] Preferably, a first pressure sensor and a first flowmeter are provided on the carbon dioxide delivery pipe.

[0027] Preferably, the impurity gas supply system includes an impurity gas cylinder;

[0028] The outlet of the impurity gas cylinder is connected to the inlet of an impurity transfer pump, and the outlet of the impurity transfer pump is connected to an impurity transfer pipe that communicates with the inner cavity of the autoclave.

[0029] Preferably, an impurity gas pressure sensor and an impurity gas flowmeter are provided on the impurity transfer pipe.

[0030] Preferably, the gas discharge system includes a gas discharge pipe, and a safety valve is provided on the gas discharge pipe.

[0031] The present invention also provides an experimental method for measuring the viscosity of supercritical carbon dioxide containing impurities, which is implemented based on an experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities, and includes the following steps:

[0032] Step 1: The first constant temperature water tank fills the first annular space with water to form a first water jacket layer; the second constant temperature water tank fills the second annular space with water to form a second water jacket layer;

[0033] Step 2: Select the type of impurity gas and determine the mass of the impurity gas;

[0034] Determine the temperature and pressure inside the autoclave;

[0035] Step 3: Adjust the temperatures of the first constant temperature water tank and the second constant temperature water tank so that the temperature value displayed by the temperature sensor reaches a preset value;

[0036] Step 4: Start the carbon dioxide transfer pump and introduce high-pressure or liquid carbon dioxide into the autoclave body until the pressure inside the autoclave body reaches a preset value, and the first flowmeter measures the mass of carbon dioxide;

[0037] After the introduction of carbon dioxide is completed, start the viscometer to measure the viscosity;

[0038] Step 5: Turn on the stirring motor and use the stirring paddle to stir the medium in the autoclave body;

[0039] Step 6: According to the selected type of impurity gas, start the corresponding impurity gas transfer pump and introduce the experimental impurity gas into the autoclave body until the mass of the impurity gas measured by the corresponding impurity gas flowmeter reaches a preset value;

[0040] Step 7: Adjust the rotation speed of the stirring paddle through the stirring motor to change the tip shear rate at the blade of the stirring paddle, and simulate the viscosity change law of supercritical carbon dioxide under different pipeline transportation flow rate conditions;

[0041] Step 8: Obtain the viscosity data during the experiment using a viscometer, and turn off the stirring motor after the experiment ends;

[0042] Step 9: Change the type of impurity gas and the mass of the impurity gas, and repeat Steps 3 to 8 to conduct experiments on the viscosity change of supercritical carbon dioxide under conditions of impurity gases with different contents and types;

[0043] Step 10: Change the temperature and pressure inside the autoclave, and repeat Steps 3 to 8 to conduct experiments on the viscosity change of supercritical carbon dioxide under different working conditions.

[0044] The beneficial effects of the present invention are as follows:

[0045] The present invention can obtain the viscosity data of supercritical carbon dioxide under different working conditions and conditions of impurity gases with different contents and types. At the same time, the present invention can adjust the rotation speed of the stirring paddle through the stirring motor, thereby changing the tip shear rate at the blade of the stirring paddle, and conduct viscosity measurement experiments on supercritical carbon dioxide containing impurity gases under different pipeline transportation flow rate conditions. Furthermore, the viscosity data of supercritical carbon dioxide containing impurity gases under different pipeline transportation flow rate conditions can be obtained. These data can be used to explore the viscosity change law of supercritical carbon dioxide under conditions of impurity gases with different types and contents, and can also provide parameter support for the hydraulic and thermal calculation process of supercritical carbon dioxide pipeline transportation. Brief Description of the Drawings

[0046] The specification drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application.

[0047] Figure 1 is a schematic structural diagram of the experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities of the present invention;

[0048] Wherein:

[0049] 1 - Temperature sensor;

[0050] 2 - First pressure sensor;

[0051] 3 - First flowmeter;

[0052] 4 - Carbon dioxide gas cylinder, 401 - Carbon dioxide delivery pump, 402 - Carbon dioxide delivery pipe;

[0053] 5 - Autoclave body;

[0054] 6 - First water jacket layer;

[0055] 7 - Thermal insulation layer;

[0056] 8 - Viscometer;

[0057] 9 - Stirring paddle;

[0058] 10 - First impurity gas pressure sensor;

[0059] 11 - First impurity gas cylinder, 1101 - First impurity transfer pump, 1102 - First impurity transfer pipe;

[0060] 12 - First impurity gas flowmeter;

[0061] 13 - Second impurity gas flowmeter;

[0062] 14 - Impurity gas source, 1401 - Second impurity transfer pump, 1402 - Second impurity transfer pipe;

[0063] 15 - Second impurity gas pressure sensor;

[0064] 16 - First constant temperature water tank;

[0065] 17 - Second water jacket layer;

[0066] 18 - Temperature control component;

[0067] 19 - Second constant temperature water tank;

[0068] 20 - Autoclave lid;

[0069] 21 - Safety valve;

[0070] 22 - Stirring motor;

[0071] 23 - Pressure sensor;

[0072] 24 - Gas discharge pipe. Detailed implementation manners

[0073] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs.

[0074] It should be noted that the terms used herein are merely for describing specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0075] In the present invention, terms such as "upper", "lower", "bottom", "top", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only relational terms determined for the convenience of describing the structural relationship of each component or element of the present invention, and do not specifically refer to any component or element in the present invention, and should not be construed as a limitation to the present invention.

[0076] In the present invention, terms such as "connected" and "coupled" should be understood in a broad sense, which may mean a fixed connection, an integral connection or a detachable connection; it may be directly connected or indirectly connected through an intermediate medium. For those skilled in relevant scientific research or technology in this field, the specific meanings of the above terms in the present invention can be determined according to specific circumstances, and should not be construed as a limitation to the present invention.

[0077] The present invention will be further described below in conjunction with the drawings and embodiments.

[0078] Embodiment 1:

[0079] As Figure 1 shown, an experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities includes an autoclave with a stirrer;

[0080] The inner cavity of the autoclave is connected to a carbon dioxide supply system, a gas discharge system, and several impurity gas supply systems for providing different impurity gases;

[0081] A viscometer 8 is provided on the inner wall of the autoclave; wherein the viscometer 8 is an on-line viscometer;

[0082] A temperature sensor 1 for detecting the inner cavity temperature and a pressure sensor 23 for detecting the inner cavity pressure are provided in the autoclave.

[0083] Preferably, the autoclave includes an autoclave body 5 and an autoclave cover 20;

[0084] The autoclave cover 20 is in sealing fit with the autoclave body 5, and the autoclave cover 20 seals the autoclave body 5 to create the temperature and pressure environment required for the experiment.

[0085] Embodiment 2:

[0086] As Figure 1 shown, an experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities includes an autoclave with a stirrer;

[0087] The inner cavity of the autoclave is connected to a carbon dioxide supply system, a gas discharge system, and several impurity gas supply systems for providing different impurity gases;

[0088] A viscometer 8 is provided on the inner wall of the autoclave; wherein the viscometer 8 is an on-line viscometer;

[0089] A temperature sensor 1 for detecting the internal cavity temperature and a pressure sensor 23 for detecting the internal cavity pressure are provided inside the autoclave.

[0090] Preferably, the autoclave includes an autoclave body 5 and an autoclave lid 20;

[0091] The autoclave lid 20 is in sealing fit with the autoclave body 5, and the autoclave lid 20 seals the autoclave body 5 to create the temperature and pressure environment required for the experiment.

[0092] Preferably, a first annular cavity is provided inside the cylindrical side wall of the autoclave body 5, and the first annular cavity is connected by a pipeline to a first constant temperature water tank 16 for supplying hot water.

[0093] When the first annular cavity is filled with hot water, a first water jacket layer 6 of the autoclave is formed, and the first water jacket layer 6 controls the temperature inside the autoclave body 5 to make the main body of the device reach the temperature value required for the experiment.

[0094] Example 3:

[0095] As Figure 1 shown, an experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities includes an autoclave with a stirrer;

[0096] The internal cavity of the autoclave is connected to a carbon dioxide supply system, a gas discharge system, and several impurity gas supply systems for supplying different impurity gases;

[0097] A viscometer 8 is provided on the inner wall of the autoclave; wherein the viscometer 8 is an on-line viscometer;

[0098] A temperature sensor 1 for detecting the internal cavity temperature and a pressure sensor 23 for detecting the internal cavity pressure are provided inside the autoclave.

[0099] Preferably, the autoclave includes an autoclave body 5 and an autoclave lid 20;

[0100] The autoclave lid 20 is in sealing fit with the autoclave body 5, and the autoclave lid 20 seals the autoclave body 5 to create the temperature and pressure environment required for the experiment.

[0101] Preferably, a first annular cavity is provided inside the cylindrical side wall of the autoclave body 5, and the first annular cavity is connected by a pipeline to a first constant temperature water tank 16 for supplying hot water.

[0102] When the first annular cavity is filled with hot water, a first water jacket layer 6 of the autoclave is formed, and the first water jacket layer 6 controls the temperature inside the autoclave body 5 to make the main body of the device reach the temperature value required for the experiment.

[0103] Preferably, a heat insulation layer 7 is provided on the outer wall surface of the cylindrical side wall of the autoclave body 5. The heat insulation layer 7 inhibits the heat transfer between the autoclave body 5 and the outside, preventing unnecessary heat dissipation of the device main body.

[0104] Example 4:

[0105] As Figure 1 shown, an experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities includes an autoclave with a stirrer;

[0106] The inner cavity of the autoclave is connected to a carbon dioxide supply system, a gas discharge system, and several impurity gas supply systems for providing different impurity gases;

[0107] A viscometer 8 is provided on the inner wall of the autoclave; wherein the viscometer 8 is an on-line viscometer;

[0108] A temperature sensor 1 for detecting the inner cavity temperature and a pressure sensor 23 for detecting the inner cavity pressure are provided in the autoclave.

[0109] Preferably, the autoclave includes an autoclave body 5 and an autoclave cover 20;

[0110] The autoclave cover 20 is in sealing fit with the autoclave body 5, and the autoclave cover 20 seals the autoclave body 5 to create the temperature and pressure environment required for the experiment.

[0111] Preferably, a first annular cavity is provided in the cylindrical side wall of the autoclave body 5, and the first annular cavity is connected by a pipeline to a first constant temperature water tank 16 for providing hot water.

[0112] When the first annular cavity is filled with hot water, a first water jacket layer 6 of the autoclave is formed. The first water jacket layer 6 controls the temperature inside the autoclave body 5 to enable the device main body to reach the temperature value required for the experiment.

[0113] Preferably, a heat insulation layer 7 is provided on the outer wall surface of the cylindrical side wall of the autoclave body 5. The heat insulation layer 7 inhibits the heat transfer between the autoclave body 5 and the outside, preventing unnecessary heat dissipation of the device main body.

[0114] Preferably, the stirrer includes a stirring paddle 9 located in the inner cavity of the autoclave body 5;

[0115] A transmission shaft is fixedly provided in the middle of the upper side of the stirring paddle 9, and the transmission shaft is coaxially arranged with the autoclave body 5;

[0116] The top end of the transmission shaft penetrates upward through the autoclave cover 20 and is fixedly and coaxially connected to the output shaft of the stirring motor 22;

[0117] The stirring motor 22 is fixedly provided on the autoclave cover 20.

[0118] In this application, the stirrer keeps the medium in the autoclave in a homogeneous mixing state during the experiment, improving the repeatability of the test process.

[0119] Example 5:

[0120] As Figure 1 shown, an experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities includes an autoclave with a stirrer;

[0121] The inner cavity of the autoclave is connected to a carbon dioxide supply system, a gas discharge system, and several impurity gas supply systems for providing different impurity gases;

[0122] A viscometer 8 is provided on the inner wall of the autoclave; wherein the viscometer 8 is an on-line viscometer;

[0123] A temperature sensor 1 for detecting the temperature of the inner cavity and a pressure sensor 23 for detecting the pressure of the inner cavity are provided in the autoclave.

[0124] Preferably, the autoclave includes an autoclave body 5 and an autoclave cover 20;

[0125] The autoclave cover 20 is in sealing fit with the autoclave body 5, and the autoclave cover 20 seals the autoclave body 5 to create the temperature and pressure environment required for the experiment.

[0126] Preferably, a first annular cavity is provided in the cylindrical side wall of the autoclave body 5, and the first annular cavity is connected by a pipeline to a first constant temperature water tank 16 for providing hot water.

[0127] When the first annular cavity is filled with hot water, a first water jacket layer 6 of the autoclave is formed, and the first water jacket layer 6 controls the temperature inside the autoclave body 5 to make the main body of the device reach the temperature value required for the experiment.

[0128] Preferably, a heat insulation layer 7 is provided on the outer wall surface of the cylindrical side wall of the autoclave body 5, and the heat insulation layer 7 inhibits the heat transfer between the autoclave body 5 and the outside, preventing unnecessary heat dissipation from the main body of the device.

[0129] Preferably, the stirrer includes a stirring paddle 9 located in the inner cavity of the autoclave body 5;

[0130] A transmission shaft is fixedly provided in the middle on the upper side of the stirring paddle 9, and the transmission shaft is coaxially arranged with the autoclave body 5;

[0131] The top end of the transmission shaft passes upward through the autoclave cover 20 and is fixedly and coaxially connected to the output shaft of the stirring motor 22;

[0132] The stirring motor 22 is fixedly provided on the autoclave cover 20.

[0133] In this application, the stirrer keeps the medium in the autoclave in a uniformly mixed state during the experiment, improving the repeatability of the test process.

[0134] Preferably, a temperature control component 18 is arranged outside the transmission shaft located in the inner cavity of the autoclave body 5;

[0135] The temperature control component 18 has a cylindrical structure. A second annular cavity is arranged in the middle of the temperature control component 18, and the second annular cavity is connected to the second constant temperature water tank 19 through a pipeline;

[0136] The top end of the temperature control component 18 is fixedly connected to the bottom end of the autoclave cover 20.

[0137] When the second annular cavity is filled with hot water, a second water jacket layer 17 of the autoclave is formed. The second water jacket layer 17 controls the temperature around the transmission shaft on the stirring paddle 9 in the autoclave, so that the main body of the device reaches the temperature value required for the experiment.

[0138] Example 6:

[0139] As Figure 1 shown, an experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities includes an autoclave with a stirrer;

[0140] The inner cavity of the autoclave is connected to a carbon dioxide supply system, a gas discharge system, and several impurity gas supply systems for providing different impurity gases;

[0141] A viscometer 8 is arranged on the inner wall of the autoclave; the viscometer 8 is an on-line viscometer;

[0142] A temperature sensor 1 for detecting the inner cavity temperature and a pressure sensor 23 for detecting the inner cavity pressure are arranged in the autoclave.

[0143] Preferably, the autoclave includes an autoclave body 5 and an autoclave cover 20;

[0144] The autoclave cover 20 is in sealing fit with the autoclave body 5, and the autoclave cover 20 seals the autoclave body 5 to create the temperature and pressure environment required for the experiment.

[0145] Preferably, a first annular cavity is arranged in the cylindrical side wall of the autoclave body 5, and the first annular cavity is connected to a first constant temperature water tank 16 for providing hot water through a pipeline.

[0146] When the first annular cavity is filled with hot water, a first water jacket layer 6 of the autoclave is formed. The first water jacket layer 6 controls the temperature in the autoclave body 5, so that the main body of the device reaches the temperature value required for the experiment.

[0147] Preferably, a heat insulation layer 7 is provided on the outer wall surface of the cylindrical side wall of the autoclave body 5. The heat insulation layer 7 inhibits the heat transfer between the autoclave body 5 and the outside, preventing the main body of the device from losing excessive heat.

[0148] Preferably, the stirrer includes a stirring paddle 9 located in the inner cavity of the autoclave body 5;

[0149] A transmission shaft is fixedly provided in the middle of the upper side of the stirring paddle 9, and the transmission shaft is coaxially arranged with the autoclave body 5;

[0150] The top end of the transmission shaft passes upward through the autoclave cover 20 and is fixedly and coaxially connected to the output shaft of the stirring motor 22;

[0151] The stirring motor 22 is fixedly provided on the autoclave cover 20.

[0152] In this application, the stirrer keeps the medium in the autoclave in a uniformly mixed state during the experiment, improving the repeatability of the test process.

[0153] Preferably, a temperature control component 18 is provided outside the transmission shaft located in the inner cavity of the autoclave body 5;

[0154] The temperature control component 18 has a cylindrical structure, and a second annular cavity is provided in the middle of the temperature control component 18. The second annular cavity is connected to the second constant temperature water tank 19 through a pipeline;

[0155] The top end of the temperature control component 18 is fixedly connected to the bottom end of the autoclave cover 20.

[0156] When the second annular cavity is filled with hot water, a second water jacket layer 17 of the autoclave is formed. The second water jacket layer 17 controls the temperature around the transmission shaft on the stirring paddle 9 in the autoclave, enabling the main body of the device to reach the temperature value required for the experiment.

[0157] Preferably, the carbon dioxide supply system includes a carbon dioxide gas cylinder 4;

[0158] The outlet of the carbon dioxide gas cylinder 4 is connected to the inlet of the carbon dioxide delivery pump 401, and the outlet of the carbon dioxide delivery pump 401 is connected to the carbon dioxide delivery pipe 402 that communicates with the inner cavity of the autoclave.

[0159] Example 7:

[0160] As Figure 1 shown, an experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities includes an autoclave with a stirrer;

[0161] The inner cavity of the autoclave is connected to a carbon dioxide supply system, a gas discharge system, and several impurity gas supply systems for providing different impurity gases;

[0162] A viscometer 8 is provided on the inner wall of the autoclave; the viscometer 8 is an on-line viscometer.

[0163] A temperature sensor 1 for detecting the temperature of the inner cavity and a pressure sensor 23 for detecting the pressure of the inner cavity are provided in the autoclave.

[0164] Preferably, the autoclave includes an autoclave body 5 and an autoclave lid 20.

[0165] The autoclave lid 20 is in sealing cooperation with the autoclave body 5, and the autoclave lid 20 seals the autoclave body 5 to create the temperature and pressure environment required for the experiment.

[0166] Preferably, a first annular cavity is provided in the cylindrical side wall of the autoclave body 5, and the first annular cavity is connected to a first constant temperature water tank 16 for supplying hot water through a pipeline.

[0167] When the first annular cavity is filled with hot water, a first water jacket layer 6 of the autoclave is formed, and the first water jacket layer 6 controls the temperature inside the autoclave body 5 to make the device body reach the temperature value required for the experiment.

[0168] Preferably, a heat insulation layer 7 is provided on the outer wall surface of the cylindrical side wall of the autoclave body 5, and the heat insulation layer 7 inhibits the heat transfer between the autoclave body 5 and the outside, preventing unnecessary heat dissipation of the device body.

[0169] Preferably, the stirrer includes a stirring paddle 9 located in the inner cavity of the autoclave body 5.

[0170] A transmission shaft is fixedly provided in the middle of the upper side of the stirring paddle 9, and the transmission shaft is coaxially arranged with the autoclave body 5.

[0171] The top end of the transmission shaft passes upward through the autoclave lid 20 and is fixedly and coaxially connected to the output shaft of a stirring motor 22.

[0172] The stirring motor 22 is fixedly provided on the autoclave lid 20.

[0173] In this application, the stirrer keeps the medium in the autoclave in a uniformly mixed state during the experiment, improving the repeatability of the test process.

[0174] Preferably, a temperature control component 18 is provided outside the transmission shaft located in the inner cavity of the autoclave body 5.

[0175] The temperature control component 18 has a cylindrical structure, and a second annular cavity is provided in the middle of the temperature control component 18. The second annular cavity is connected to a second constant temperature water tank 19 through a pipeline.

[0176] The top end of the temperature control component 18 is fixedly connected to the bottom end of the autoclave lid 20.

[0177] When the second annular cavity is filled with hot water, it forms the second water jacket layer 17 of the autoclave. The second water jacket layer 17 controls the temperature around the transmission shaft on the stirring paddle 9 in the autoclave, so that the main body of the device reaches the temperature value required for the experiment.

[0178] Preferably, the carbon dioxide supply system includes a carbon dioxide gas cylinder 4;

[0179] The outlet of the carbon dioxide gas cylinder 4 is connected to the inlet of the carbon dioxide delivery pump 401, and the outlet of the carbon dioxide delivery pump 401 is connected to the carbon dioxide delivery pipe 402 that communicates with the inner cavity of the autoclave.

[0180] Preferably, a first pressure sensor 2 and a first flowmeter 3 are provided on the carbon dioxide delivery pipe 402.

[0181] The first flowmeter 3 is used to monitor the flow rate of the gas source (carbon dioxide) during the experimental test, and assist in controlling the gas consumption during the experiment.

[0182] Example 8:

[0183] As Figure 1 shown, an experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities includes an autoclave with a stirrer;

[0184] The inner cavity of the autoclave is connected to a carbon dioxide supply system, a gas discharge system, and several impurity gas supply systems for providing different impurity gases;

[0185] A viscometer 8 is provided on the inner wall of the autoclave; wherein the viscometer 8 is an on-line viscometer;

[0186] A temperature sensor 1 for detecting the inner cavity temperature and a pressure sensor 23 for detecting the inner cavity pressure are provided in the autoclave.

[0187] Preferably, the autoclave includes an autoclave body 5 and an autoclave cover 20;

[0188] The autoclave cover 20 is in sealing fit with the autoclave body 5, and the autoclave cover 20 seals the autoclave body 5 to create the temperature and pressure environment required for the experiment.

[0189] Preferably, a first annular cavity is provided in the cylindrical side wall of the autoclave body 5, and the first annular cavity is connected to the first constant temperature water tank 16 for providing hot water through a pipeline.

[0190] When the first annular cavity is filled with hot water, it forms the first water jacket layer 6 of the autoclave. The first water jacket layer 6 controls the temperature in the autoclave body 5, so that the main body of the device reaches the temperature value required for the experiment.

[0191] Preferably, a heat insulation layer 7 is provided on the outer wall surface of the cylindrical side wall of the autoclave body 5. The heat insulation layer 7 inhibits the heat transfer between the autoclave body 5 and the outside world, preventing the main body of the device from losing excessive heat.

[0192] Preferably, the stirrer includes a stirring paddle 9 located in the inner cavity of the autoclave body 5;

[0193] A transmission shaft is fixedly provided in the middle of the upper side of the stirring paddle 9, and the transmission shaft is coaxially arranged with the autoclave body 5;

[0194] The top end of the transmission shaft penetrates upward through the autoclave lid 20 and is fixedly and coaxially connected to the output shaft of the stirring motor 22;

[0195] The stirring motor 22 is fixedly provided on the autoclave lid 20.

[0196] In this application, the stirrer keeps the medium in the autoclave in a uniformly mixed state during the experiment, improving the repeatability of the test process.

[0197] Preferably, a temperature control component 18 is provided outside the transmission shaft located in the inner cavity of the autoclave body 5;

[0198] The temperature control component 18 has a cylindrical structure. A second annular cavity is provided in the middle of the temperature control component 18, and the second annular cavity is connected to the second constant temperature water tank 19 through a pipeline;

[0199] The top end of the temperature control component 18 is fixedly connected to the bottom end of the autoclave lid 20.

[0200] When the second annular cavity is filled with hot water, a second water jacket layer 17 of the autoclave is formed. The second water jacket layer 17 controls the temperature around the transmission shaft on the stirring paddle 9 in the autoclave, so that the main body of the device reaches the temperature value required for the experiment.

[0201] Preferably, the carbon dioxide supply system includes a carbon dioxide gas cylinder 4;

[0202] The outlet of the carbon dioxide gas cylinder 4 is connected to the inlet of the carbon dioxide delivery pump 401, and the outlet of the carbon dioxide delivery pump 401 is connected to a carbon dioxide delivery pipe 402 that communicates with the inner cavity of the autoclave.

[0203] Preferably, a first pressure sensor 2 and a first flowmeter 3 are provided on the carbon dioxide delivery pipe 402.

[0204] The first flowmeter 3 is used to monitor the flow rate of the gas source (carbon dioxide) during the experimental test, and assist in controlling the gas consumption during the experiment.

[0205] Preferably, the impurity gas supply system includes an impurity gas cylinder;

[0206] The outlet of the impurity gas cylinder is connected to the inlet of the impurity transfer pump, and the outlet of the impurity transfer pump is connected to the impurity transfer pipe that communicates with the inner cavity of the autoclave.

[0207] Example 9:

[0208] As Figure 1 shown, an experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities includes an autoclave with a stirrer;

[0209] The inner cavity of the autoclave is connected to a carbon dioxide supply system, a gas discharge system, and several impurity gas supply systems for providing different impurity gases;

[0210] A viscometer 8 is provided on the inner wall of the autoclave; wherein the viscometer 8 is an on-line viscometer;

[0211] A temperature sensor 1 for detecting the inner cavity temperature and a pressure sensor 23 for detecting the inner cavity pressure are provided in the autoclave.

[0212] Preferably, the autoclave includes an autoclave body 5 and an autoclave lid 20;

[0213] The autoclave lid 20 is in sealing fit with the autoclave body 5, and the autoclave lid 20 seals the autoclave body 5 to create the temperature and pressure environment required for the experiment.

[0214] Preferably, a first annular cavity is provided in the cylindrical side wall of the autoclave body 5, and the first annular cavity is connected by a pipeline to a first constant temperature water tank 16 for providing hot water.

[0215] When the first annular cavity is filled with hot water, a first water jacket layer 6 of the autoclave is formed, and the first water jacket layer 6 controls the temperature inside the autoclave body 5 to make the main body of the device reach the temperature value required for the experiment.

[0216] Preferably, a heat insulation layer 7 is provided on the outer wall surface of the cylindrical side wall of the autoclave body 5, and the heat insulation layer 7 inhibits the heat transfer between the autoclave body 5 and the outside world to prevent unnecessary heat dissipation of the main body of the device.

[0217] Preferably, the stirrer includes a stirring paddle 9 located in the inner cavity of the autoclave body 5;

[0218] A transmission shaft is fixedly provided in the middle of the upper side of the stirring paddle 9, and the transmission shaft is coaxially arranged with the autoclave body 5;

[0219] The top end of the transmission shaft passes upward through the autoclave lid 20 and is fixedly and coaxially connected to the output shaft of the stirring motor 22;

[0220] The stirring motor 22 is fixedly arranged on the autoclave lid 20.

[0221] In this application, the stirrer keeps the medium in the autoclave in a uniformly mixed state during the experiment, improving the repeatability of the test process.

[0222] Preferably, a temperature control component 18 is arranged outside the transmission shaft in the inner cavity of the autoclave body 5;

[0223] The temperature control component 18 has a cylindrical structure, and a second annular cavity is arranged in the middle of the temperature control component 18. The second annular cavity is connected to the second constant temperature water tank 19 through a pipeline;

[0224] The top end of the temperature control component 18 is fixedly connected to the bottom end of the autoclave lid 20.

[0225] When the second annular cavity is filled with hot water, a second water jacket layer 17 of the autoclave is formed. The second water jacket layer 17 controls the temperature around the transmission shaft on the stirring paddle 9 in the autoclave, enabling the main body of the device to reach the temperature value required for the experiment.

[0226] Preferably, the carbon dioxide supply system includes a carbon dioxide gas cylinder 4;

[0227] The outlet of the carbon dioxide gas cylinder 4 is connected to the inlet of the carbon dioxide delivery pump 401, and the outlet of the carbon dioxide delivery pump 401 is connected to a carbon dioxide delivery pipe 402 that communicates with the inner cavity of the autoclave.

[0228] Preferably, a first pressure sensor 2 and a first flowmeter 3 are arranged on the carbon dioxide delivery pipe 402.

[0229] The first flowmeter 3 is used to monitor the flow rate of the gas source (carbon dioxide) during the experimental test, assisting in controlling the gas consumption during the experiment.

[0230] Preferably, the impurity gas supply system includes an impurity gas cylinder;

[0231] The outlet of the impurity gas cylinder is connected to the inlet of the impurity delivery pump, and the outlet of the impurity delivery pump is connected to an impurity delivery pipe that communicates with the inner cavity of the autoclave.

[0232] Preferably, an impurity gas pressure sensor and an impurity gas flowmeter are arranged on the impurity delivery pipe.

[0233] The flowmeter is used to monitor the flow rate of the gas source (impurity gas) during the experimental test, assisting in controlling the gas consumption during the experiment.

[0234] Specifically, in this application Figure 1 only two impurity gas supply systems are drawn. The first impurity gas supply system includes a first impurity gas cylinder 11;

[0235] The outlet of the first impurity gas cylinder 11 is connected to the inlet of the first impurity transfer pump 1101, and the outlet of the first impurity transfer pump 1101 is connected to the first impurity transfer pipe 1102 that communicates with the inner cavity of the autoclave;

[0236] A first impurity gas pressure sensor 10 and a first impurity gas flowmeter 12 are provided on the first impurity transfer pipe 1101.

[0237] The first impurity gas flowmeter 12 is used to monitor the flow rate of the gas source (impurity gas 1) during the experimental test, and assist in controlling the gas consumption during the experiment.

[0238] The first impurity gas supply system includes a second impurity gas cylinder 14;

[0239] The outlet of the second impurity gas cylinder 14 is connected to the inlet of the second impurity transfer pump 1401, and the outlet of the second impurity transfer pump 1401 is connected to the second impurity transfer pipe 1402 that communicates with the inner cavity of the autoclave;

[0240] A second impurity gas pressure sensor 15 and a second impurity gas flowmeter 13 are provided on the second impurity transfer pipe 1402.

[0241] The second impurity gas flowmeter 13 is used to monitor the flow rate of the gas source (impurity gas 2) during the experimental test, and assist in controlling the gas consumption during the experiment.

[0242] Example 10:

[0243] As Figure 1 shown, an experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities includes an autoclave with a stirrer;

[0244] The inner cavity of the autoclave is connected to a carbon dioxide supply system, a gas discharge system, and several impurity gas supply systems for providing different impurity gases;

[0245] A viscometer 8 is provided on the inner wall of the autoclave; wherein the viscometer 8 is an on-line viscometer;

[0246] A temperature sensor 1 for detecting the inner cavity temperature and a pressure sensor 23 for detecting the inner cavity pressure are provided in the autoclave.

[0247] Preferably, the autoclave includes an autoclave body 5 and an autoclave cover 20;

[0248] The autoclave cover 20 is in sealing cooperation with the autoclave body 5, and the autoclave cover 20 seals the autoclave body 5 to create the temperature and pressure environment required for the experiment.

[0249] Preferably, a first annular cavity is provided inside the cylindrical side wall of the autoclave body 5, and the first annular cavity is connected to a first constant temperature water tank 16 for supplying hot water through a pipeline.

[0250] When the first annular cavity is filled with hot water, a first water jacket layer 6 of the autoclave is formed, and the first water jacket layer 6 controls the temperature inside the autoclave body 5 to make the device body reach the temperature value required for the experiment.

[0251] Preferably, a heat insulation layer 7 is provided on the outer wall surface of the cylindrical side wall of the autoclave body 5, and the heat insulation layer 7 inhibits the heat transfer between the autoclave body 5 and the outside, preventing the device body from generating excessive heat dissipation.

[0252] Preferably, the stirrer includes a stirring paddle 9 located in the inner cavity of the autoclave body 5;

[0253] A transmission shaft is fixedly provided in the middle on the upper side of the stirring paddle 9, and the transmission shaft is coaxially arranged with the autoclave body 5;

[0254] The top end of the transmission shaft penetrates upward through the autoclave cover 20 and is fixedly and coaxially connected to the output shaft of the stirring motor 22;

[0255] The stirring motor 22 is fixedly provided on the autoclave cover 20.

[0256] In this application, the stirrer keeps the medium in the autoclave in a uniformly mixed state during the experiment, improving the repeatability of the test process.

[0257] Preferably, a temperature control component 18 is provided outside the transmission shaft located in the inner cavity of the autoclave body 5;

[0258] The temperature control component 18 has a cylindrical structure, and a second annular cavity is provided in the middle of the temperature control component 18, and the second annular cavity is connected to a second constant temperature water tank 19 through a pipeline;

[0259] The top end of the temperature control component 18 is fixedly connected to the bottom end of the autoclave cover 20.

[0260] When the second annular cavity is filled with hot water, a second water jacket layer 17 of the autoclave is formed, and the second water jacket layer 17 controls the temperature around the transmission shaft on the stirring paddle 9 in the autoclave to make the device body reach the temperature value required for the experiment.

[0261] Preferably, the carbon dioxide supply system includes a carbon dioxide gas cylinder 4;

[0262] The outlet of the carbon dioxide gas cylinder 4 is connected to the inlet of a carbon dioxide delivery pump 401, and the outlet of the carbon dioxide delivery pump 401 is connected to a carbon dioxide delivery pipe 402 communicating with the inner cavity of the autoclave.

[0263] Preferably, a first pressure sensor 2 and a first flowmeter 3 are provided on the carbon dioxide delivery pipe 402.

[0264] The first flowmeter 3 is used to monitor the flow rate of the gas source (carbon dioxide) during the experimental test, and assist in controlling the gas consumption during the experiment.

[0265] Preferably, the impurity gas supply system includes an impurity gas cylinder;

[0266] The outlet of the impurity gas cylinder is connected to the inlet of the impurity delivery pump, and the outlet of the impurity delivery pump is connected to an impurity delivery pipe that communicates with the inner cavity of the autoclave.

[0267] Preferably, an impurity gas pressure sensor and an impurity gas flowmeter are provided on the impurity delivery pipe.

[0268] The flowmeter is used to monitor the flow rate of the gas source (impurity gas) during the experimental test, and assist in controlling the gas consumption during the experiment.

[0269] Specifically, only two impurity gas supply systems are drawn in the present application Figure 1 in which the first impurity gas supply system includes a first impurity gas cylinder 11;

[0270] The outlet of the first impurity gas cylinder 11 is connected to the inlet of the first impurity delivery pump 1101, and the outlet of the first impurity delivery pump 1101 is connected to a first impurity delivery pipe 1102 that communicates with the inner cavity of the autoclave;

[0271] A first impurity gas pressure sensor 10 and a first impurity gas flowmeter 12 are provided on the first impurity delivery pipe 1101.

[0272] The first impurity gas flowmeter 12 is used to monitor the flow rate of the gas source (impurity gas 1) during the experimental test, and assist in controlling the gas consumption during the experiment.

[0273] The second impurity gas supply system includes a second impurity gas cylinder 14;

[0274] The outlet of the second impurity gas cylinder 14 is connected to the inlet of the second impurity delivery pump 1401, and the outlet of the second impurity delivery pump 1401 is connected to a second impurity delivery pipe 1402 that communicates with the inner cavity of the autoclave;

[0275] A second impurity gas pressure sensor 15 and a second impurity gas flowmeter 13 are provided on the second impurity delivery pipe 1402.

[0276] The second impurity gas flowmeter 13 is used to monitor the flow rate of the gas source (impurity gas 2) during the experimental test, and assist in controlling the gas consumption during the experiment.

[0277] Preferably, the gas discharge system includes a gas discharge pipe 24, and a safety valve 21 is provided on the gas discharge pipe 24.

[0278] To prevent danger caused by excessive pressure in the autoclave, the safety valve 21 automatically opens when the set pressure value is reached.

[0279] In the present invention, both the autoclave body 5 and the temperature control component 18 inside it are of cylindrical structures, and they are concentric. Both have annular cavities, and circulating water flows in the annular cavities. The annular cavities are connected to the corresponding constant temperature water tanks, so as to be able to control the temperature change of the experimental medium in the autoclave body 5 during the experiment; the temperature control range is -10 to 90 °C, which can meet the temperature control range requirements of supercritical carbon dioxide during the experiment.

[0280] The top end of the temperature control component 18 is concentric with and connected to the autoclave lid 20 to form a whole. When the autoclave lid 20 is hermetically connected to the autoclave body 5, the temperature control component 18 automatically enters the autoclave body 5 and floats at the central position of the autoclave body 5.

[0281] After the autoclave lid 20 is connected to the autoclave body 5 and sealed, a carbon dioxide gas cylinder 4 is used to adjust the valve to introduce high-pressure or liquid carbon dioxide into the autoclave body 5, so that the pressure in the autoclave body 5 reaches above the pressure condition for forming supercritical carbon dioxide. During this process, a first flowmeter 3 is used to measure the mass of carbon dioxide introduced into the autoclave body 5. An experimental impurity gas is introduced into the autoclave body 5, and the mass of the impurity gas introduced into the autoclave body 5 is measured by a corresponding impurity gas flowmeter. The mass of the impurity gas introduced into the autoclave body 5 can be changed accordingly according to the experimental conditions, so as to explore the viscosity change law of supercritical carbon dioxide under different impurity content conditions.

[0282] When the temperature value displayed by the temperature sensor 1 reaches the required value, the stirring motor 22 is turned on to stir the medium in the autoclave body 5 with the stirring paddle 9, so as to ensure the uniformity of the medium in the autoclave body 5 and improve the repeatability of the experimental test process. During the experiment, the rotation speed of the stirring paddle 9 can be adjusted through the stirring motor 22, so as to change the tip shear rate at the blade of the stirring paddle 9 and simulate the viscosity change law of supercritical carbon dioxide containing impurity gas under different pipeline transportation flow velocity conditions.

[0283] A viscometer 8 is installed on the inner wall of the autoclave body 5, and the viscometer 8 measures the viscosity value and its change of the medium in the autoclave body 5.

[0284] In addition, the safety valve 21 installed on the autoclave body 5 can be automatically opened to prevent the pressure inside the autoclave body 5 from being too high and exceeding the bearing capacity, which may cause danger to the autoclave. The set value of its safety pressure can be adjusted according to the experiment and the actual working conditions of the autoclave.

[0285] Example 11:

[0286] An experimental method for measuring the viscosity of supercritical carbon dioxide containing impurities, implemented based on the experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities in Example 10, includes the following steps:

[0287] Step 1: The first constant temperature water tank 16 fills the first annular space with water to form the first water jacket layer 6; the second constant temperature water tank 19 fills the second annular space with water to form the second water jacket layer 17;

[0288] Step 2: Select the type of impurity gas and determine the mass of the impurity gas;

[0289] Determine the temperature and pressure inside the autoclave; among them, the determined pressure value should reach above the pressure condition for forming supercritical carbon dioxide;

[0290] Step 3: Adjust the temperatures of the first constant temperature water tank 16 and the second constant temperature water tank 19 so that the temperature value displayed by the temperature sensor 1 reaches the preset value;

[0291] Step 4: Start the carbon dioxide delivery pump 401 and introduce high-pressure or liquid carbon dioxide into the autoclave body 5 until the pressure inside the autoclave body 5 reaches the preset value, and the first flowmeter 3 measures the mass of carbon dioxide;

[0292] After the carbon dioxide is introduced, start the viscometer 8 to start measuring the viscosity;

[0293] Step 5: Turn on the stirring motor 22 and use the stirring paddle 9 to stir the medium in the autoclave body 5;

[0294] Step 6: According to the selected type of impurity gas, start the corresponding impurity gas delivery pump and introduce the experimental impurity gas into the autoclave body 5 until the mass of the impurity gas measured by the corresponding impurity gas flowmeter reaches the preset value;

[0295] Step 7: Adjust the rotation speed of the stirring paddle 9 through the stirring motor 22 to change the tip shear rate at the blade of the stirring paddle 9 and simulate the viscosity change law of supercritical carbon dioxide under different pipeline transportation flow rate conditions;

[0296] Step 8: Obtain the viscosity data during the experiment through the viscometer 8, and turn off the stirring motor 22 after the experiment ends;

[0297] Step 9: Change the type and mass of the impurity gas, and repeat Steps 3 - 8 to conduct experiments on the viscosity change of supercritical carbon dioxide under conditions of impurity gases with different contents and types;

[0298] Step 10: Change the temperature and pressure inside the autoclave, and repeat Steps 3 - 8 to conduct experiments on the viscosity change of supercritical carbon dioxide under different working conditions.

[0299] The present invention can obtain the viscosity data of supercritical carbon dioxide under different working conditions and conditions of impurity gases with different contents and types. At the same time, the present invention can adjust the rotation speed of the stirring paddle through the stirring motor, thereby changing the tip shear rate at the blade of the stirring paddle, and conduct viscosity measurement experiments on supercritical carbon dioxide containing impurity gases under different pipeline transportation flow rate conditions, and then obtain the viscosity data of supercritical carbon dioxide containing impurity gases under different pipeline transportation flow rate conditions. These data can be used to explore the viscosity change law of supercritical carbon dioxide under conditions of impurity gases with different types and contents, and can also provide parameter support for the hydraulic and thermal calculation process of supercritical carbon dioxide pipeline transportation.

[0300] Although the specific implementation manners of the present invention are described above in conjunction with the drawings, it is not a limitation to the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. An experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities, including an autoclave with a stirrer; characterized in that, The inner cavity of the autoclave is connected to a carbon dioxide supply system, a gas discharge system, and several impurity gas supply systems for providing different impurity gases; A viscometer is arranged on the inner wall of the autoclave; A temperature sensor for detecting the inner cavity temperature and a pressure sensor for detecting the inner cavity pressure are arranged in the autoclave.

2. The experimental apparatus for measuring the viscosity of supercritical carbon dioxide containing impurities as described in claim 1, characterized in that, The autoclave includes an autoclave body and an autoclave cover; The autoclave cover is in sealed cooperation with the autoclave body.

3. The experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities as described in claim 2, characterized in that, A first annular cavity is arranged in the cylindrical side wall of the autoclave body, and the first annular cavity is connected to a first constant temperature water tank for providing hot water through a pipeline.

4. The experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities according to claim 3, characterized in that, A heat preservation layer is arranged on the outer wall surface of the cylindrical side wall of the autoclave body.

5. The experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities as described in claim 4, characterized in that, The stirrer includes a stirring paddle located in the inner cavity of the autoclave body; A transmission shaft is fixedly arranged in the middle of the upper side of the stirring paddle, and the transmission shaft is coaxially arranged with the autoclave body; The top end of the transmission shaft penetrates upward through the autoclave cover and is fixedly connected coaxially with the output shaft of the stirring motor; The stirring motor is fixedly arranged on the autoclave cover.

6. The experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities according to claim 5, wherein, A temperature control component is arranged outside the transmission shaft located in the inner cavity of the autoclave body; The temperature control component is in a cylindrical structure, and a second annular cavity is arranged in the middle of the temperature control component, and the second annular cavity is connected to a second constant temperature water tank through a pipeline; The top end of the temperature control component is fixedly connected to the bottom end of the autoclave cover.

7. The experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities according to claim 6, characterized in that, The carbon dioxide supply system includes a carbon dioxide gas cylinder; The outlet of the carbon dioxide gas cylinder is connected to the inlet of a carbon dioxide delivery pump, and the outlet of the carbon dioxide delivery pump is connected to a carbon dioxide delivery pipe communicating with the inner cavity of the autoclave.

8. The experimental apparatus for measuring the viscosity of supercritical carbon dioxide containing impurities according to claim 7, characterized in that, A first pressure sensor and a first flow meter are arranged on the carbon dioxide delivery pipe.

9. The experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities as claimed in claim 8, wherein, The impurity gas supply system includes an impurity gas cylinder; The outlet of the impurity gas cylinder is connected to the inlet of an impurity delivery pump, and the outlet of the impurity delivery pump is connected to an impurity delivery pipe communicating with the inner cavity of the autoclave.

10. The experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities as described in claim 9, characterized in that, An impurity gas pressure sensor and an impurity gas flow meter are arranged on the impurity delivery pipe.

11. The experimental device for measuring the viscosity of supercritical carbon dioxide containing impurities according to claim 10, characterized in that, The gas discharge system includes a gas discharge pipe, and a safety valve is arranged on the gas discharge pipe.

12. An experimental method for measuring the viscosity of supercritical carbon dioxide containing impurities, characterized in that, Implemented based on the experimental method for measuring the viscosity of supercritical carbon dioxide containing impurities as described in claim 11, including the following steps Step 1: The first constant temperature water tank fills the first annular space with water to form a first water jacket layer; the second constant temperature water tank fills the second annular space with water to form a second water jacket layer; Step 2: Select the type of impurity gas and determine the mass of the impurity gas; Determine the temperature and pressure inside the autoclave; Step 3: Adjust the temperatures of the first constant temperature water tank and the second constant temperature water tank so that the temperature value displayed by the temperature sensor reaches the preset value; Step 4: Start the carbon dioxide delivery pump and introduce high-pressure or liquid carbon dioxide into the autoclave body until the pressure inside the autoclave body reaches the preset value, and the first flow meter measures the mass of carbon dioxide; After the carbon dioxide is introduced, start the viscometer to start measuring the viscosity; Step 5: Turn on the stirring motor and use the stirring paddle to stir the medium in the autoclave body; Step 6: According to the type of the selected impurity gas, start the corresponding impurity gas delivery pump, and introduce the experimental impurity gas into the autoclave body until the mass of the impurity gas measured by the corresponding impurity gas flowmeter reaches the preset value; Step 7: Adjust the rotation speed of the stirring paddle through the stirring motor to change the tip shear rate at the blade of the stirring paddle, and simulate the viscosity change law of supercritical carbon dioxide under different pipeline transportation flow rate conditions; Step 8: Obtain the viscosity data during the experiment through the viscometer, and turn off the stirring motor after the experiment ends; Step 9: Change the type and mass of the impurity gas, and repeat Steps 3 to 8 to conduct the viscosity change experiment of supercritical carbon dioxide under the conditions of impurity gases with different contents and types; Step 10: Change the temperature and pressure in the autoclave, and repeat Steps 3 to 8 to conduct the viscosity change experiment of supercritical carbon dioxide under different working conditions.

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