Supercritical CO2 system preparation and viscosity determination system

Abstract

The invention discloses a supercritical CO2 system preparation and viscosity measurement system, which consists of a supercritical CO2 preparation system, a buffer tank, a weighing system, a high-pressure mixing system, a magnetic drive detection system, a bracket and a data processing control system, the data processing control system comprises a temperature sensor, a pressure sensor, a rotating speed sensor, a torque sensor, an actuator and a communication line, and the device and the method have the advantages that precise preparation of the supercritical CO2 material system is realized through a weighing method, and wide-range measurement of the viscosity of the supercritical CO2 material system is realized by adopting rotors with different sizes and rotating speeds. The method can be widely applied to the field of supercritical CO2 system viscosity measurement, and has wide popularization and application prospects.

Description

Technical Field

[0001] The invention belongs to the field of high-pressure system preparation and viscosity detection, and specifically relates to a supercritical CO2 system preparation and viscosity measurement system. Technical Background

[0002] Supercritical CO2 technology is widely used in foaming and spray molding processes. Supercritical CO2 has a significant viscosity-reducing effect on the system, so it is of great significance to measure the viscosity of supercritical CO2 systems. Traditional viscosity measurement methods are mostly measured under normal pressure conditions. CN221782073U discloses a single-component online high-pressure rotational viscometer, and CN2852109Y discloses a single-component high-temperature and high-pressure rotational viscometer. However, there is currently no high-temperature and high-pressure supercritical CO2 system preparation and viscosity measurement system. It is urgent to develop a system that can simultaneously achieve high-temperature and high-pressure supercritical CO2 system precise preparation and viscosity measurement. Summary of the invention

[0003] The purpose of this invention is to design a supercritical CO2 system preparation and viscosity measurement system to solve the problems raised in the above background technology.

[0004] The technical solution adopted by the patent of this invention:

[0005] A supercritical CO2 system preparation and viscosity measurement system, characterized in that: the supercritical CO2 system preparation and viscosity measurement system includes a supercritical CO2 preparation system, a buffer tank, a weighing system, a high-pressure mixing system, a magnetic drive detection system, a bracket, a data processing control system and an automatic valve and connecting pipelines, the supercritical CO2 preparation system, the automatic valve, the buffer tank, the automatic valve and the high-pressure mixing system are connected in sequence through pipelines; the buffer tank also includes a buffer tank body and an electric heating belt, and the electric heating belt is wound on the buffer tank body; the high-pressure mixing system also includes a vacuum The vacuum pump, the air extraction pipe, the feed pipe, the cylinder, the electric heating belt, the O-ring, the insulation layer, the bolts and the upper end cover, and the upper end cover is fixed to the upper part of the cylinder by bolts, and the middle is sealed by the O-ring. The cylinder is wound with the electric heating belt and the insulation layer from the inside to the outside, and the bottom center is connected to the feed pipe. The air extraction pipe is fixed to the upper part of the upper end cover and is connected to the vacuum pump through an automatic valve; the magnetic drive detection system also includes a motor, a coupling, a torque meter, a coupling, a magnetic drive device, a cooling water jacket, a connecting nut and a rotor, and the magnetic drive device is fixed on the upper part of the high-pressure mixing system. The motor is fixed on the upper support of the bracket at the center of the end cover. The torque meter is vertically connected between the motor and the magnetic drive device through a coupling and a coupling. A cooling water jacket is installed around the magnetic drive device, and the lower part is vertically connected to the rotor in the cylinder through a connecting nut. The bracket includes a support, an upper support, an intermediate support, a lower support and a support plate, and the upper support, the intermediate support and the lower support are respectively fixed on the upper, middle and lower parts of the support, and the support plate is fixed on the support between the intermediate support and the lower support. The data processing control system includes a control cabinet, a temperature sensor, and a pressure sensor. , speed sensor, torque sensor, actuator (the actuators include supercritical CO2 preparation system switch, weighing system switch, vacuum pump switch, motor switch, electric heating belt, switch, automatic valve switch, automatic valve switch, automatic valve switch and data processing control system power switch) and communication lines, and temperature sensors, and are respectively installed in the buffer tank body, cylinder and cooling water jacket, pressure sensors and are respectively installed in the buffer tank body and cylinder, speed sensor and torque sensor are installed in the torque meter, and the actuator is installed in the control cabinet and connected to the equipment through communication lines.

[0006] Preferably, the CO2 content in the supercritical CO2 system ranges from 0 to 100 wt% with an accuracy of ±0.5%.

[0007] Preferably, the high-pressure mixing system (4) has a pressure range of 0 to 200 MPa, a temperature range of 0 to 600° C., and a vacuum degree of 1 to 10 Pa.

[0008] Preferably, the speed range of the motor (5-1) is 0 to 2900 rpm.

[0009] Preferably, the viscosity measurement range of the supercritical CO2 system viscosity measurement system is 10 -3 ~10 3 Pa.s.

[0010] Preferably, the material of the O-ring (4-6) is made of rubber materials such as nitrile, fluororubber and silicone rubber when the temperature of the cylinder (4-4) is lower than 80°C, and high temperature resistant materials such as graphite and metal are used when the temperature of the cylinder (4-4) is higher than 80°C.

[0011] Compared with the existing viscosity measuring device, this device can achieve accurate preparation of supercritical CO2 system by weighing method, and can achieve wide range measurement of supercritical CO2 system viscosity by using rotors of different sizes and rotation speeds. The present invention can be widely used in the field of supercritical CO2 system viscosity measurement, and has broad prospects for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the supercritical CO2 system preparation and viscosity measurement system.

[0013] like Figure 1 As shown, 1. supercritical CO2 preparation system, 2. buffer tank, 3. weighing system, 4. high-pressure mixing system, 5. magnetic drive detection system, 6. bracket, 7. data processing control system, 2-1. electric heating belt 4-1. vacuum pump, 4-2. air extraction pipe, 4-3. feed pipe, 4-4. cylinder, 4-5. electric heating belt, 4-6. O-ring, 4-7. insulation layer, 4-8. bolt, 4-9. upper end cover, 5-1. motor, 5-2-1~2. coupling, 5-3. torque meter, 5-4. magnetic drive device, 5-5. cooling water jacket, 5-5-1. water inlet, 5-5-2. water outlet, 5-6. connecting nut, 5-7. rotor, 6-1. bracket Column, 6-2~4. Support, 6-5. Support plate, 7-1. Control cabinet, 7-2~7-4. Temperature sensor, 7-5~7-6. Pressure sensor, 7-7. Speed ​​sensor, 7-8. Torque sensor, 7-9. Supercritical CO2 preparation system (1) switch, 7-10. Weighing system (3) switch, 7-11. Vacuum pump (4-1) switch, 7-12. Motor (5-1) switch, 7-13. Electric heating belt (2-1, 4-5) switch, 7-14. Automatic valve (0-1) switch, 7-15. Automatic valve (0-2) switch, 7-16. Automatic valve (0-3) switch, 7-17. Data processing control system (7) power switch and communication line. DETAILED DESCRIPTION

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and through implementation examples.

[0015] The viscosity of the configuration is 10-3 ~10 3 After different material systems of different viscosity values ​​are measured by a conventional viscometer, they are added into the barrel (4-4) of the medium- and high-pressure mixing system (4) of the present invention, and a suitable rotor (5-7) and a rotation speed are selected. The corresponding torque values ​​are measured by a torque meter (5-3) and a data processing control system (7) under normal pressure, and then the viscosity-torque standard lines at different rotation speeds are drawn.

[0016] Furthermore, a rotor of appropriate size is installed on the connecting nut (5-6).

[0017] Furthermore, according to the estimated value, a weighing system (3) is used to weigh the corresponding weight of the material, which is loaded into the cylinder (4-4) and sealed with the upper end cover (4-9) by tightening bolts (4-8) and O-rings (4-6).

[0018] Further, the automatic valve (0-3) switch (7-16) between the upper end cover (4-9) and the vacuum pump (4-1) is opened, and the vacuum pump (4-1) switch (7-11) is started to draw the vacuum degree in the cylinder (4-4) to 1-10 Pa, and the vacuum pump (4-1) switch (7-11) is first closed, and then the automatic valve (0-3) switch (7-16) is closed to ensure that the air in the cylinder (4-4) can be completely emptied.

[0019] Further, the switch (7-9) of the supercritical CO2 preparation system and the switch (7-14) of the automatic valve (0-1) are turned on, and supercritical CO2 is injected into the buffer tank (2). After reaching the set pressure, the switch (7-10) of the weighing system (3) is turned on and the total weight of the buffer tank (2) displayed by the weighing system (3) is recorded. Subsequently, the switch (7-12) of the motor (5-1) is started and its speed is adjusted to the speed value corresponding to the standard curve. Then, the switch (7-15) of the automatic valve (0-2) is turned on, and CO2 is started to be introduced into the cylinder (4-4) and stirred and mixed with the previously added materials until the weight reduction of the buffer tank (2) is equal to the required CO2 intake amount. Then, the switch (7-15) of the automatic valve (0-2) is closed to stop the CO2 intake.

[0020] Furthermore, if the temperature setting value in the cylinder (4-4) is lower than 80°C, when the pressure and temperature in the cylinder (4-4) reach the set values, the torque value of the supercritical CO2 system at the corresponding rotor and speed is measured by the torque meter (5-3) and the data processing control system (7), and then the viscosity is determined using the corresponding viscosity-torque standard line that has been drawn.

[0021] Furthermore, if the temperature setting value in the cylinder (4-4) is higher than 80°C, cooling water is first introduced into the cooling water jacket (5-5), and then when the pressure and temperature in the cylinder (4-4) reach the set values, the torque value of the supercritical CO2 system at the corresponding rotor and speed is measured by the torque meter (5-3) and the data processing control system (7), and then its viscosity is determined using the corresponding viscosity-torque standard line that has been drawn.

[0022] It should be noted that the technical terms or scientific terms used in the present invention patent should be the common meanings understood by people with general skills in the field to which the present invention belongs. The words "include" or "comprise" and the like used in the present invention patent mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The words "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Above", "middle", "below", "inside", "between", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] The above is a clear and complete description of the technical solutions in the specific implementation of the patent of the present invention. The described embodiments are only part of the embodiments of the patent of the present invention, not all of them. Based on the embodiments in the patent of the present invention, all other embodiments obtained by relevant personnel in the field without creative work are within the scope of protection of the patent of the present invention.

Claims

1. A supercritical CO2 system preparation and viscosity measurement system, characterized in that: The supercritical CO2 material preparation and viscosity measurement system comprises a supercritical CO2 preparation system (1), a buffer tank (2), a weighing system (3), a high-pressure mixing system (4), a magnetic drive detection system (5), a bracket (6), a data processing control system (7), automatic valves (0-1, 0-2, 0-3) and connecting pipelines. The supercritical CO2 preparation system (1), the automatic valve (0-1), the buffer tank (2), the automatic valve (0-2) and the high-pressure mixing system (4) are sequentially connected through pipelines; the buffer tank (2) further comprises a buffer tank body (2-1) and an electric heating belt (2-2), and the electric heating belt (2-2) is wound around the buffer tank body (2-1). 1); the high-pressure mixing system (4) further comprises a vacuum pump (4-1), an air extraction pipe (4-2), a feed pipe (4-3), a cylinder (4-4), an electric heating belt (4-5), an O-type sealing ring (4-6), a thermal insulation layer (4-7), bolts (4-8) and an upper end cover (4-9), wherein the upper end cover (4-9) is fixed to the upper part of the cylinder (4-4) by bolts (4-8), and the middle is sealed by an O-type sealing ring (4-6), the cylinder (4-4) is wound with the electric heating belt (4-5) and the thermal insulation layer (4-7) in sequence from the inside to the outside, the bottom center is connected to the feed pipe (4-3), the air extraction pipe (4-2) is fixed to the upper part of the upper end cover (4-9), The magnetic drive detection system (5) further comprises a motor (5-1), a coupling (5-2-1), a torque meter (5-3), a coupling (5-2-2), a magnetic drive device (5-4), a cooling water jacket (5-5), a connecting nut (5-6) and a rotor (5-7), wherein the magnetic drive device (5-4) is fixed to the center of the upper end cover (4-9) of the high-pressure mixing system (4), the motor (5-1) is fixed to the upper support (6-2) of the bracket (6), and the torque meter (5-3) is vertically connected to the motor (5-1) through the coupling (5-2-1) and the coupling (5-2-2). 1) and a magnetic driving device (5-4), a cooling water jacket (5-5) is installed around the magnetic driving device, and is vertically connected to the rotor (5-7) in the cylinder (4-4) through a connecting nut (5-6) at the bottom; the bracket (6) further comprises a pillar (6-1), an upper support (6-2), an intermediate support (6-3), a lower support (6-4) and a support plate (6-5), and the upper support (6-2), the intermediate support (6-3) and the lower support (6-4) are respectively fixed to the upper, middle and lower parts of the pillar (6-1), and the support plate (6-5) is fixed to the pillar (6-1) between the intermediate support (6-3) and the lower support (6-4);The data processing control system further comprises a control cabinet (7-1), temperature sensors (7-2, 7-3, 7-4), pressure sensors (7-5, 7-6), a speed sensor (7-7), a torque sensor (7-8), an actuator (the actuator comprises a supercritical CO2 preparation system (1) switch (7-9), a weighing system (3) switch (7-10), a vacuum pump (4-1) switch (7-11), a motor (5-1) switch (7-12), an electric heating belt (2-1, 4-5) switch (7-13), an automatic valve (0-1) switch (7-14), an automatic valve (0-2) switch (7-15), an automatic valve (0-3) switch (7-16) and data processing control system (7) power switch (7-17)) and communication lines, and temperature sensors (7-2), (7-3) and (7-4) are respectively installed in the buffer tank body (2-1), the cylinder (4-4) and the cooling water jacket (5-5), pressure sensors (7-5) and (7-6) are respectively installed in the buffer tank body (2-1) and the cylinder (4-4), the speed sensor (7-7) and the torque sensor (7-8) are installed in the torque meter (5-3), and the actuators (7-9) to (7-17) are installed in the control cabinet (7-1) and connected to the equipment through the communication line. ; 2. A supercritical CO2 system preparation and viscosity measurement system according to claim 1, characterized in that: The CO2 content in the supercritical CO2 system ranges from 0 to 100wt% with an accuracy of ±0.5%.

3. A supercritical CO2 system preparation and viscosity measurement system according to claim 1, characterized in that: The high-pressure mixing system (4) has a pressure range of 0 to 200 MPa, a temperature range of 0 to 600° C., and a vacuum degree of 1 to 10 Pa.

4. A supercritical CO2 system preparation and viscosity measurement system according to claim 1, characterized in that: The speed range of the motor (5-1) is 0 to 2900 rpm.

5. A supercritical CO2 system preparation and viscosity measurement system according to claim 1, characterized in that: The viscosity measurement range of the supercritical CO2 system viscosity measurement system is 10 -3 ~10 3 Pa.s.

6. A supercritical CO2 system preparation and viscosity measurement system according to claim 1, characterized in that: When the temperature of the cylinder (4-4) is lower than 80°C, the material of the O-type sealing ring (4-6) is made of rubber materials such as nitrile, fluororubber and silicone rubber, and when the temperature of the cylinder (4-4) is higher than 80°C, high temperature resistant materials such as graphite and metal are used.

Images