CN111947029A - Stable supercritical carbon dioxide gas supply system and method - Google Patents
Stable supercritical carbon dioxide gas supply system and method Download PDFInfo
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- CN111947029A CN111947029A CN202010932376.1A CN202010932376A CN111947029A CN 111947029 A CN111947029 A CN 111947029A CN 202010932376 A CN202010932376 A CN 202010932376A CN 111947029 A CN111947029 A CN 111947029A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
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Abstract
The invention aims to provide a stable supercritical carbon dioxide gas supply system and method. The system comprises: the system comprises a carbon dioxide gas cylinder, a carbon dioxide booster pump, a double-layer supercritical carbon dioxide storage tank containing heat conducting oil, a conveying gas circuit, a gas inlet pipeline, a gas outlet pipeline, a temperature sensor and a pressure sensor; the carbon dioxide gas cylinder is an initial gas source of the system and is used for providing carbon dioxide gas; the carbon dioxide gas bottle is connected with the carbon dioxide booster pump through a conveying gas path; the carbon dioxide booster pump is connected with the supercritical carbon dioxide storage tank through an air inlet pipeline; the supercritical carbon dioxide storage tank is connected with other devices needing supercritical carbon dioxide through a gas outlet pipeline; therefore, compared with the prior art, the embodiment of the invention can conveniently and accurately realize the preparation of the supercritical carbon dioxide and supply the supercritical carbon dioxide under stable pressure and temperature.
Description
Technical Field
The invention relates to the field of supercritical and high-differential pressure fluid preparation, in particular to a system and a method for preparing supercritical carbon dioxide.
Background
At present, supercritical carbon dioxide is widely applied to various turbines and engines due to the high density characteristic, and the related research on the equipment needs a stable supercritical carbon dioxide gas source. Therefore, it is necessary to produce supercritical carbon dioxide under various pressure and temperature conditions. However, under the action of the high pressure difference, the pressure and the temperature of the output of the supercritical carbon dioxide are unstable, and the error is large.
Disclosure of Invention
The invention aims to provide a stable supercritical carbon dioxide gas supply system and method so as to accurately obtain supercritical carbon dioxide fluid at required pressure and temperature.
In order to solve the above technical problem, the embodiment of the present invention is implemented as follows:
in one aspect, the present invention provides a stable supercritical carbon dioxide gas supply system, comprising: the system comprises a carbon dioxide gas cylinder, a carbon dioxide booster pump, a double-layer supercritical carbon dioxide storage tank containing heat conducting oil, a conveying gas circuit, a gas inlet pipeline, a gas outlet pipeline, a temperature sensor and a pressure sensor; wherein the content of the first and second substances,
the carbon dioxide gas cylinder consists of two gas cylinders, is an initial gas source of the system and is used for providing carbon dioxide gas with the pressure of 6-8 Mpa; the carbon dioxide gas bottle is connected with the carbon dioxide booster pump through a conveying gas path, and a fourth valve is arranged on the conveying gas path and used for controlling the on-off of the conveying gas path;
the carbon dioxide booster pump is connected with the supercritical carbon dioxide storage tank through an air inlet pipeline, and a fifth valve, a pressure sensor and a temperature sensor are arranged on the air inlet pipeline; the fifth valve is used for controlling the on-off of the air inlet pipeline; the temperature sensor is used for measuring the outlet temperature of the carbon dioxide booster pump, and the pressure sensor is used for measuring the outlet pressure of the carbon dioxide booster pump;
the supercritical carbon dioxide storage tank is connected with other devices needing supercritical carbon dioxide through a gas outlet pipeline, heat conducting oil contained in the supercritical carbon dioxide storage tank is used for heating carbon dioxide in an oil bath, and a sixth valve, a seventh valve and a ninth valve are arranged on the gas outlet pipeline; the sixth valve is used for controlling the on-off of the gas outlet pipeline, the seventh valve is used for controlling whether the supercritical carbon dioxide storage tank is decompressed, and the ninth valve is used for controlling the medium pressure output by the supercritical carbon dioxide storage tank.
Optionally, the gas conveying path further includes: the pressure sensor is connected with the first valve, the second valve and the third valve; wherein the content of the first and second substances,
the number of the carbon dioxide gas cylinders is two, and the two pressure sensors are respectively used for monitoring the pressure of the carbon dioxide gas cylinders independently; the first valve is used for controlling the opening and closing of one carbon dioxide gas cylinder, and the second valve is used for controlling the opening and closing of the other carbon dioxide gas cylinder; and when the third valve is used for replacing the carbon dioxide gas cylinder, the carbon dioxide in the conveying gas circuit is emptied.
Optionally, the system further comprises: a pressure sensor and a temperature sensor; wherein the content of the first and second substances,
the pressure sensor is used for measuring the pressure of the supercritical carbon dioxide in other devices; the temperature sensor is used for measuring the temperature of the supercritical carbon dioxide in other devices.
Optionally, the supercritical carbon dioxide storage tank comprises: the device comprises a first closed container, a second closed container and a flow guide pipe;
a first communicating hole, a second communicating hole, a third communicating hole and a fourth communicating hole are formed in the top of the first closed container; the first communicating hole is an air inlet hole, the first communicating hole is connected with the outlet of the carbon dioxide booster pump through an air inlet pipeline, and a guide pipe for guiding fluid is arranged below the first communicating hole; the second communication hole is an air outlet and is connected with other devices through an outlet pipeline for air supply;
the third communication hole is a temperature measuring hole for connecting a temperature sensor, and the fourth communication hole is a pressure measuring hole for connecting a pressure sensor;
the second closed container is sleeved outside the first closed container to form a storage tank body; a fifth communication hole, a sixth communication hole, a seventh communication hole, an eighth communication hole, a ninth communication hole and a tenth communication hole are formed in the side wall of the second closed container; the fifth communication hole is a pressure measuring hole for connecting the pressure sensor; the seventh communication hole is a temperature measuring hole for connecting a temperature sensor; the sixth communicating hole and the eighth communicating hole are hot oil circulating ports and are connected with a circulating oil pump through a circulating pipeline; the ninth communication hole and the tenth communication hole are electric heater interfaces connected with an electric heater, and the electric heater is used for heating heat conduction oil in the second closed container.
Optionally, the system further comprises: a processor; wherein the content of the first and second substances,
the processor is electrically connected with the electric heater, obtains the temperatures detected by the temperature sensor of the first closed container, the temperature sensor of the second closed container and the temperature sensors in other devices, and controls the power of the electric heater by calculating the change of the temperature detected by the temperature sensors.
Optionally, the system further comprises: a vacuum pump and a vacuum pumping pipeline; wherein the content of the first and second substances,
the vacuum pump is arranged on a vacuum pumping pipeline, and the vacuum pumping pipeline is connected with the gas outlet pipeline; an eighth valve is arranged on the vacuum pumping pipeline; and the eighth valve is used for controlling the on-off of the vacuumizing pipeline.
In another aspect, the present invention further provides a stable supercritical carbon dioxide gas supply method, which is applied to the stable supercritical carbon dioxide gas supply system provided in the foregoing embodiment, and is applied to the supercritical carbon dioxide gas supply system, where the method includes:
the air supply system performs vacuum air extraction;
preheating a supercritical carbon dioxide storage tank;
the carbon dioxide booster pump boosts carbon dioxide;
preparing supercritical carbon dioxide with stable pressure and temperature in a supercritical carbon dioxide storage tank; other devices requiring supercritical carbon dioxide are supplied with gas through an outlet line.
Optionally, in the case that the supercritical carbon dioxide gas supply system comprises an evacuation line, the method further comprises:
if the system reaches the set vacuum degree under the action of the vacuum pump, the valve on the vacuum pumping pipeline is controlled to be closed.
Optionally, supercritical carbon dioxide of a stable pressure and temperature is produced in the supercritical carbon dioxide storage tank, the method further comprising:
when the pressure read by a pressure sensor in a first closed container included in the supercritical carbon dioxide storage tank exceeds a first set value, controlling the carbon dioxide booster pump to stop working, and when the pressure is lower than the first set value, controlling the carbon dioxide booster pump to start pressurizing; when the pressure read by the pressure sensor in the first closed container after being pressurized exceeds a second set value in the operation process, controlling a seventh valve to be automatically opened for pressure relief;
when the temperature of the heat conduction oil read by a temperature sensor in a second closed container included in the supercritical carbon dioxide storage tank exceeds a set value, controlling the electric heater to stop working, and when the temperature of the heat conduction oil is lower than the set value, controlling the electric heater to start heating;
optionally, controlling the stabilization of the outlet line supply air temperature pressure, the method further comprising:
if the fluid pressure in the other device exceeds or is lower than a set value, controlling the opening of a ninth valve so as to adjust the fluid pressure in the other device to the set value;
if the gas supply temperature is higher than the set temperature, reading the temperature of the heat conduction oil and the temperature of the supercritical carbon dioxide in the supercritical carbon dioxide storage tank, and reducing the power of the electric heater according to the read temperature;
and if the gas supply temperature is lower than the set temperature, reading the temperature of the heat conduction oil and the temperature of the supercritical carbon dioxide in the supercritical carbon dioxide storage tank, and increasing the power of the electric heater according to the read temperature.
In the embodiment of the invention, in order to ensure the temperature and the pressure of the supercritical carbon dioxide, a supercritical carbon dioxide storage tank is arranged. In the storage tank, the temperature of the supercritical carbon dioxide can be changed according to the temperature of the high-temperature heat conduction oil, the high-temperature heat conduction oil is heated by the electric heater, the power of the electric heater can be changed according to the measured temperature of the supercritical carbon dioxide in the inner tank, and the temperature of the supercritical carbon dioxide is accurately and stably controlled through joint regulation. It should be noted that the pressure of the supercritical carbon dioxide inside the storage tank fluctuates, the booster pump will continuously supplement the fluid into the supercritical carbon dioxide storage tank, and the output pressure of the supercritical carbon dioxide storage tank can be stably output under the action of the ninth valve, so as to achieve the state of simultaneous preparation and use. Therefore, compared with the prior art, the embodiment of the invention can conveniently and accurately realize the preparation of the supercritical carbon dioxide and output the supercritical carbon dioxide with stable pressure and temperature.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a supercritical carbon dioxide storage tank of a stable supercritical carbon dioxide gas supply system according to an embodiment of the present invention. (ii) a
FIG. 2 is a schematic diagram of a stable supercritical carbon dioxide gas supply system according to an embodiment of the present invention;
fig. 3 is a diagram illustrating the operation steps of a stable supercritical carbon dioxide gas supply system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic structural diagram of a supercritical carbon dioxide storage tank according to an embodiment of the present invention is shown. As shown in fig. 1, the apparatus includes: a first closed container 101, a second closed container 102, a draft tube 103, an electric heater 15, and a circulating oil pump 13.
Here, the first closed vessel 101 and the second closed vessel 102 may be cylindrical vessels. Four communication holes are provided at the top of the first hermetic container 101,
the first communicating hole 111 is an air inlet, the first communicating hole 111 is connected with the outlet of the carbon dioxide booster pump 12 through the air inlet pipeline 52, and the guide pipe 103 for guiding the fluid is arranged below the first communicating hole 111. The second communication hole 112 is an air outlet and is connected to the succeeding device 17 through the outlet line 53 for air supply. The third communication hole 113 is a temperature measurement hole for connecting the temperature sensor 422, and the fourth communication hole 114 is a pressure measurement hole for connecting the pressure sensor 414; wherein, a protective sleeve is arranged below the temperature measuring hole 422 to protect the sensor from high pressure.
The second closed container 102 is sleeved outside the first closed container 101 to form a storage tank body. A fifth communication hole 115, a sixth communication hole 116, a seventh communication hole 117, an eighth communication hole 118, and a ninth communication hole 119 are provided in a side wall of the second closed casing 102, and the tenth communication hole 120 and the fifth communication hole 115 are pressure measurement holes for connecting a pressure sensor 415; the seventh communication hole 117 is a temperature measurement hole for connecting the temperature sensor 423; the sixth communication hole 116 and the eighth communication hole 118 are hot oil circulation ports, and are connected to the circulating oil pump 13 through the circulation line 55; the ninth communication hole 119 and the tenth communication hole 120 are electric heater interfaces connected to the electric heater 15, and the electric heater 15 is used for heating the heat conducting oil in the second closed container 102.
In the embodiment of the invention, in order to make the oil bath temperature distribution uniform, the circulating oil pump 13 can be placed in an open state, the heat conduction oil passes through the hot oil circulating port 118, is pumped into the circulating pipeline 55 under the action of the circulating oil pump 13, flows into the second closed container 102 from the hot oil circulating port 116, and is low in height and high in height, so that the uniform oil bath heating temperature is realized. It should be noted that the number of the electric heaters can be increased optionally, so that the requirement of higher heating temperature can be satisfied.
Referring to fig. 2, a schematic diagram of a stable supercritical carbon dioxide gas supply system according to an embodiment of the present invention is shown. As shown in fig. 2, the system includes: the system comprises a carbon dioxide gas cylinder 11, a carbon dioxide booster pump 12, a double-layer supercritical carbon dioxide storage tank 14 containing heat conduction oil, a circulating oil pump 13, a vacuum pump 16, an electric heater 15, a conveying gas circuit 51, an air inlet pipeline 52, an air outlet pipeline 53, a vacuum pumping pipeline 54, a circulating pipeline 55, a valve, a temperature sensor, a pressure sensor and a processor (not shown in the figure).
The carbon dioxide gas cylinder 11 consists of two gas cylinders, is an initial gas source of the system and is used for providing carbon dioxide gas with the pressure of 6-8 MPa. The carbon dioxide gas bottle 11 is connected with the carbon dioxide booster pump 12 through a conveying gas path 51, a fourth valve 34 is arranged on the conveying gas path, and the fourth valve 34 controls the on-off of the conveying gas path.
Here, the fourth valve 34 may be a manual valve or an electric valve. Specifically, the fourth valve 34 may be a solenoid valve.
The carbon dioxide booster pump 12 is connected with the supercritical carbon dioxide storage tank 14 through an air inlet pipeline 52, and a fifth valve 35, a pressure sensor 413 and a temperature sensor 421 are arranged on the air inlet pipeline 52; the fifth valve 35 is used for controlling the on-off of the air inlet pipeline 52; the temperature sensor 421 is used for measuring the outlet temperature of the carbon dioxide booster pump 12, and the pressure sensor 413 is used for measuring the outlet pressure of the carbon dioxide booster pump 12. Here, the fifth valve 35 may be a manual valve or an electric valve. Specifically, the fifth valve 35 may be a solenoid valve
The double-layer supercritical carbon dioxide storage tank 14 containing heat transfer oil is the equipment shown in fig. 1 and is used for stabilizing the pressure and temperature of the supercritical carbon dioxide. The heat conducting oil contained in the supercritical carbon dioxide storage tank 14 is used for heating carbon dioxide in an oil bath through the electric heater 15, the circulating oil pump 13 and the circulating pipeline 55. The supercritical carbon dioxide storage tank 14 is connected to other devices 17 requiring supercritical carbon dioxide through a gas outlet line 53.
The outlet pipeline 53 is provided with a sixth valve 36, a seventh valve 37 and a ninth valve 39; the sixth valve 36 is used for controlling the on-off of the gas outlet pipeline 53, the seventh valve 37 is used for controlling whether the supercritical carbon dioxide storage tank 14 is decompressed, and the ninth valve 39 is used for controlling the medium pressure output by the supercritical carbon dioxide storage tank 14. Here, the sixth valve 36, the seventh valve 37, and the ninth valve 39 may be electrically operated valves. Specifically, the sixth valve 36 and the seventh valve 37 may be solenoid valves, and the ninth valve 39 is an electric control valve.
Optionally, the conveying gas path 51 further includes: the pressure sensors 411, 412 and the first, second, and third valves 31, 32, 33; wherein the content of the first and second substances,
and a pressure sensor 411 and a pressure sensor 412 are arranged on the conveying gas path, wherein the pressure sensor 411 is used for monitoring the pressure of one carbon dioxide gas cylinder 11, and the pressure sensor 412 is used for monitoring the pressure of the other carbon dioxide gas cylinder 11. The first valve 31 is used for controlling the opening and closing of one carbon dioxide gas cylinder 11, the second valve 32 is used for controlling the opening and closing of the other carbon dioxide gas cylinder 11, and the third valve 33 is used for emptying carbon dioxide in the conveying gas circuit 51 when the carbon dioxide gas cylinder 11 is replaced.
Here, the first valve 31, the second valve 32, and the third valve 33 may be manual valves or electric valves. Specifically, the first valve 31 and the second valve 32 may be solenoid valves, and the third valve 33 may be a stop valve.
In this embodiment, if a plurality of carbon dioxide gas cylinders are used, the first valve 31 may be first opened and connected to the first gas cylinder. If the pressure of the carbon dioxide gas cylinder 11 monitored by the pressure sensor 411 is lower than a set value, it indicates that the gas in the carbon dioxide gas cylinder 11 is completely consumed. At this time, the second valve 32 is set to an open state, and the first valve 31 is set to a closed state, and the second gas cylinder is connected to supply gas. It should be noted that, when the carbon dioxide gas cylinder 11 is replaced, pressurized carbon dioxide is remained in the gas transmission path, and at this time, the third valve 33 needs to be opened to evacuate carbon dioxide, and then the gas cylinder is disassembled, so that danger caused by pipeline pressure is avoided.
Optionally, the system further comprises: a pressure sensor 417 and a temperature sensor 424; wherein the content of the first and second substances,
the pressure sensor 417 is used to measure the pressure of the supercritical carbon dioxide within the other device 17 and the temperature sensor 424 is used to measure the temperature of the supercritical carbon dioxide within the other device 17.
In this embodiment, the supply pressure and temperature of the system can be accurately adjusted according to the measured pressure and temperature of the supercritical carbon dioxide in the other device 17, so as to realize stable supply of the supercritical carbon dioxide.
Optionally, the system further comprises: a processor; wherein the content of the first and second substances,
the processor is electrically connected to the electric heater 15, acquires the temperatures detected by the temperature sensors 422, 423 and 424, and controls the power of the electric heater 15 by calculating the change in the temperature detected by the temperature sensors.
In this embodiment, in order to accurately control the stability of the temperature of the supercritical carbon dioxide, after the processor calculates the change of the temperature detected by the temperature sensor, the processor may run a computer program to control the power of the electric heater according to a specific conversion relationship. Here, the temperature of the supercritical carbon dioxide gas supply can be stably realized through the processor, and the error is greatly reduced.
Optionally, the system further comprises: a vacuum pump 16 and a vacuum line 54; wherein the content of the first and second substances,
the vacuum pump 16 is arranged on a vacuum-pumping pipeline 54, the vacuum-pumping pipeline 54 is connected with the gas outlet pipeline 53, the vacuum-pumping pipeline 54 is provided with an eighth valve 38, and the eighth valve 38 is used for controlling the on-off of the vacuum-pumping pipeline 54. Here, the eighth valve 38 may be an electric valve. Specifically, the eighth valve 38 may be a solenoid valve.
In this embodiment, in order to improve the purity of the supercritical carbon dioxide prepared by the system, the eighth valve and the vacuum pump may be opened to pump out air in the entire system pipeline. When the vacuum degree of the pipeline reaches a set value, the eighth valve is closed and the vacuum pump stops operating.
In conclusion, in the embodiment, the processor controls the electric heater to change the power of the electric heater according to the temperature change to realize stable temperature through the pressure stabilization of the supercritical carbon dioxide storage tank, and the system can conveniently and accurately realize the preparation and supply of the supercritical carbon dioxide under the specified temperature and pressure.
Referring to fig. 3, a diagram illustrating the operation steps of a stable supercritical carbon dioxide gas supply system according to an embodiment of the present invention is shown. The method is applied to the stable supercritical carbon dioxide gas supply system. As shown in fig. 3, the method comprises the steps of:
step 301: the air supply system performs vacuum air extraction;
step 302: preheating a supercritical carbon dioxide storage tank;
step 303: the carbon dioxide booster pump boosts carbon dioxide;
step 304: preparing supercritical carbon dioxide with stable pressure and temperature in a supercritical carbon dioxide storage tank;
step 305: other devices requiring supercritical carbon dioxide are supplied with gas through an outlet line.
Optionally, in the case that the supercritical carbon dioxide gas supply system includes an evacuation line, the method further comprises:
if the system reaches the set vacuum degree under the action of the vacuum pump, the valve on the vacuum pumping pipeline is controlled to be closed.
It should be noted that the preparation of supercritical carbon dioxide at a stable pressure and temperature in a supercritical carbon dioxide storage tank includes:
when the pressure read by a pressure sensor in a first closed container included in the supercritical carbon dioxide storage tank exceeds a first set value, controlling the carbon dioxide booster pump to stop working, and when the pressure is lower than the first set value, controlling the carbon dioxide booster pump to start pressurizing; when the pressure read by the pressure sensor in the pressurized first closed container exceeds a second set value in the operation process, controlling a seventh valve to be automatically opened for pressure relief;
when the temperature of the heat conduction oil read by a temperature sensor in a second closed container included in the supercritical carbon dioxide storage tank exceeds a set value, controlling the electric heater to stop working, and when the temperature of the heat conduction oil is lower than the set value, controlling the electric heater to start heating;
the method for controlling the stabilization of the temperature and pressure of the outlet line supply air includes:
if the fluid pressure in the other device exceeds or is lower than a set value, controlling the opening of a ninth valve so as to adjust the fluid pressure in the other device to the set value;
if the gas supply temperature is higher than the set temperature, reading the temperature of the heat conduction oil and the temperature of the supercritical carbon dioxide in the supercritical carbon dioxide storage tank, and reducing the power of the electric heater according to the read temperature;
and if the gas supply temperature is lower than the set temperature, reading the temperature of the heat conduction oil and the temperature of the supercritical carbon dioxide in the supercritical carbon dioxide storage tank, and increasing the power of the electric heater according to the read temperature.
In the embodiment of the invention, the carbon dioxide can be pressurized by the booster pump, the supercritical carbon dioxide storage tank heats the carbon dioxide, and the electric control valve has the function of keeping the temperature and the pressure of the supplied air stable according to the joint regulation of the temperature sensor and the electric heater. Because the circulating heat conduction oil is used for heating, the heating is uniform, the adjustment precision is high, even if the fluctuation of the air supply temperature of the supercritical carbon dioxide storage tank is large, the power regulation and control of the electric heater are carried out by utilizing the change read by the temperature sensor, and the accuracy and the reliability of the air supply temperature can be better ensured. Therefore, compared with the prior art, the embodiment of the invention can conveniently and accurately realize the preparation and supply of the supercritical carbon dioxide under the specified temperature and pressure.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. A stabilized supercritical carbon dioxide gas supply system, comprising: the device comprises a carbon dioxide gas cylinder (11), a carbon dioxide booster pump (12), a double-layer supercritical carbon dioxide storage tank (14) containing heat conduction oil, a conveying gas circuit (51), an air inlet pipeline (52), an air outlet pipeline (53), a temperature sensor (421) and a pressure sensor (413);
the carbon dioxide gas bottle (11) is an initial gas source of the system and is used for providing carbon dioxide gas with the pressure of 6-8 Mpa; the carbon dioxide gas bottle (11) is connected with the carbon dioxide booster pump (12) through a conveying gas circuit (51), a fourth valve (34) is arranged on the conveying gas circuit (51), and the fourth valve (34) is used for controlling the on-off of the conveying gas circuit (51);
the carbon dioxide booster pump (12) is connected with the supercritical carbon dioxide storage tank (14) through an air inlet pipeline (52), and a fifth valve (35), a pressure sensor (413) and a temperature sensor (421) are arranged on the air inlet pipeline (52); the fifth valve (35) is used for controlling the on-off of the air inlet pipeline (52); the temperature sensor (421) is used for measuring the outlet temperature of the carbon dioxide booster pump (12), and the pressure sensor (413) is used for measuring the outlet pressure of the carbon dioxide booster pump (12);
the supercritical carbon dioxide storage tank (14) is connected with other devices (17) needing supercritical carbon dioxide through a gas outlet pipeline (53), heat conducting oil contained in the supercritical carbon dioxide storage tank (14) is used for heating carbon dioxide in an oil bath, and a sixth valve (36), a seventh valve (37) and a ninth valve (39) are arranged on the gas outlet pipeline (53); the sixth valve (36) is used for controlling the on-off of the gas outlet pipeline (53), the seventh valve (37) is used for controlling whether the supercritical carbon dioxide storage tank (14) is decompressed, and the ninth valve (39) is used for controlling the medium pressure output by the supercritical carbon dioxide storage tank (14).
2. The system according to claim 1, wherein said delivery circuit (51) further comprises: a pressure sensor (411), a pressure sensor (412), a first valve (31), a second valve (32) and a third valve (33); wherein the content of the first and second substances,
the number of the carbon dioxide gas cylinders (11) is two, the pressure sensor (411) is used for monitoring the pressure of one of the carbon dioxide gas cylinders (11), and the pressure sensor (412) is used for monitoring the pressure of the other carbon dioxide gas cylinder (11); the first valve (31) is used for controlling the opening and closing of one carbon dioxide gas cylinder (11), and the second valve (32) is used for controlling the opening and closing of the other carbon dioxide gas cylinder (11); the third valve (33) is used for emptying carbon dioxide in the conveying gas path (51) when the carbon dioxide gas bottle (11) is replaced.
3. The system of claim 1, further comprising: a pressure sensor (417) and a temperature sensor (424); wherein the content of the first and second substances,
the pressure sensor (417) is used for measuring the pressure of the supercritical carbon dioxide in the other device (17); the temperature sensor (424) is used for measuring the temperature of the supercritical carbon dioxide in other devices (17).
4. The system of claim 3, wherein the supercritical carbon dioxide storage tank comprises: a first closed container (101), a second closed container (102) and a guide pipe (103);
a first communication hole (111), a second communication hole (112), a third communication hole (113) and a fourth communication hole (114) are formed in the top of the first closed container (101); the first communicating hole (111) is an air inlet, the first communicating hole (111) is connected with the outlet of the carbon dioxide booster pump (12) through an air inlet pipeline (52), and a guide pipe (103) for guiding fluid is arranged below the first communicating hole (111); the second communication hole (112) is an air outlet and is connected with other devices (17) through an outlet pipeline (53) for air supply;
the third communication hole (113) is a temperature measuring hole for connecting a temperature sensor (422), and the fourth communication hole (114) is a pressure measuring hole for connecting a pressure sensor (414);
the second closed container (102) is sleeved outside the first closed container (101) to form a storage tank body; a fifth communication hole (115), a sixth communication hole (116), a seventh communication hole (117), an eighth communication hole (118), a ninth communication hole (119) and a tenth communication hole (120) are formed in the side wall of the second closed container (102); the fifth communication hole (115) is a pressure measurement hole for connecting a pressure sensor (415); the seventh communication hole (117) is a temperature measurement hole for connecting a temperature sensor (423); the sixth communicating hole (116) and the eighth communicating hole (118) are hot oil circulating ports and are connected with a circulating oil pump (13) through a circulating pipeline (55); the ninth communication hole (119) and the tenth communication hole (120) are electric heater interfaces connected with an electric heater (15), and the electric heater (15) is used for heating heat conduction oil in the second closed container (102).
5. The system of claim 4, further comprising: a processor; wherein the content of the first and second substances,
the processor is electrically connected with the electric heater (15), acquires the temperatures detected by the temperature sensor (422), the temperature sensor (423) and the temperature sensor (424), and controls the power of the electric heater (15) by calculating the change of the temperature detected by the temperature sensor.
6. The system of claim 1, further comprising: a vacuum pump (16) and a vacuum line (54); wherein the content of the first and second substances,
the vacuum pump (16) is arranged on a vacuum pumping pipeline (54), and the vacuum pumping pipeline (54) is connected with an air outlet pipeline (53); an eighth valve (38) is arranged on the vacuumizing pipeline (54); the eighth valve (38) is used for controlling the on-off of the vacuumizing pipeline (54).
7. A method for stable supply of supercritical carbon dioxide gas, which is applied to the supercritical carbon dioxide gas supply system according to any one of claims 1 to 6, the method comprising:
the air supply system performs vacuum air extraction;
preheating a supercritical carbon dioxide storage tank;
the carbon dioxide booster pump boosts carbon dioxide;
preparing supercritical carbon dioxide with stable pressure and temperature in a supercritical carbon dioxide storage tank;
other devices requiring supercritical carbon dioxide are supplied with gas through an outlet line.
8. The method of claim 7, wherein where the supercritical carbon dioxide gas supply comprises an evacuation line, the method further comprises:
if the system reaches the set vacuum degree under the action of the vacuum pump, the valve on the vacuum pumping pipeline is controlled to be closed.
9. The method of claim 7, wherein producing supercritical carbon dioxide at a stable pressure and temperature in a supercritical carbon dioxide storage tank comprises:
when the pressure read by a pressure sensor in a first closed container included in the supercritical carbon dioxide storage tank exceeds a first set value, controlling the carbon dioxide booster pump to stop working, and when the pressure is lower than the first set value, controlling the carbon dioxide booster pump to start pressurizing; when the pressure read by the pressure sensor in the first closed container after being pressurized exceeds a second set value in the operation process, controlling a seventh valve to be automatically opened for pressure relief;
and when the temperature of the heat conduction oil read by a temperature sensor in a second closed container included in the supercritical carbon dioxide storage tank exceeds a set value, controlling the power of the electric heater to be reduced, and when the temperature of the heat conduction oil is lower than the set value, controlling the power of the electric heater to be increased.
10. The method of claim 7, wherein controlling the manner in which the outlet line supply air temperature pressure is stabilized comprises:
if the fluid pressure in the other device exceeds or is lower than a set value, controlling the opening of a ninth valve so as to adjust the fluid pressure in the other device to the set value;
if the gas supply temperature is higher than the set temperature, reading the temperature of the heat conduction oil and the temperature of the supercritical carbon dioxide in the supercritical carbon dioxide storage tank, and reducing the power of the electric heater according to the read temperature;
and if the gas supply temperature is lower than the set temperature, reading the temperature of the heat conduction oil and the temperature of the supercritical carbon dioxide in the supercritical carbon dioxide storage tank, and increasing the power of the electric heater according to the read temperature.
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| CN112747254A (en) * | 2020-12-28 | 2021-05-04 | 西安交通大学 | Supercritical carbon dioxide injection device for thickened oil mechanism experiment |
| CN112855497A (en) * | 2021-01-18 | 2021-05-28 | 天津大学 | Filling tank and air supplementing system based on supercritical carbon dioxide working medium |
| CN114165725A (en) * | 2021-12-14 | 2022-03-11 | 中氢(湖南)氢能装备有限公司 | Supercritical working medium rapid filling and accurate supply device and method |
| CN115031163A (en) * | 2022-06-06 | 2022-09-09 | 西安交通大学 | Gas supply system and method for supercritical carbon dioxide atmosphere workshop |
| CN116688839A (en) * | 2023-08-09 | 2023-09-05 | 苏州八匹马超导科技有限公司 | Supercritical fluid preparation device, mixed fluid preparation device and preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112747254A (en) * | 2020-12-28 | 2021-05-04 | 西安交通大学 | Supercritical carbon dioxide injection device for thickened oil mechanism experiment |
| CN112747254B (en) * | 2020-12-28 | 2021-11-19 | 西安交通大学 | Supercritical carbon dioxide injection device for thickened oil mechanism experiment |
| CN112855497A (en) * | 2021-01-18 | 2021-05-28 | 天津大学 | Filling tank and air supplementing system based on supercritical carbon dioxide working medium |
| CN114165725A (en) * | 2021-12-14 | 2022-03-11 | 中氢(湖南)氢能装备有限公司 | Supercritical working medium rapid filling and accurate supply device and method |
| CN115031163A (en) * | 2022-06-06 | 2022-09-09 | 西安交通大学 | Gas supply system and method for supercritical carbon dioxide atmosphere workshop |
| CN116688839A (en) * | 2023-08-09 | 2023-09-05 | 苏州八匹马超导科技有限公司 | Supercritical fluid preparation device, mixed fluid preparation device and preparation method |
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