A device and method for carbon dioxide delivery and metering

Abstract

The application discloses a device and method for carbon dioxide transportation and metering, and relates to the field of gas metering. The application separates the storage-metering of carbon dioxide from the temperature control-pressure control-transportation of carbon dioxide, and calculates the transportation amount of carbon dioxide by using the volume and density change of carbon dioxide in a carbon dioxide storage container, so that the constant temperature and pressure transportation of carbon dioxide and the metering of the transportation amount can be realized. The device is simple and reliable in structure, easy to assemble, and high in operation flexibility, and is expected to improve the stability and safety of carbon dioxide, especially liquid carbon dioxide, and is convenient, accurate and economical in metering.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas metering, in particular to a method for conveying and metering in the field of carbon dioxide research, utilization, capture and storage. BACKGROUND

[0002] Carbon dioxide, a greenhouse gas, has attracted more and more attention and become an important research object. At the same time, carbon dioxide is also an important industrial raw material. Conveying and metering of carbon dioxide is the basis for carbon dioxide research, utilization, capture and storage.

[0003] Conveying and metering of carbon dioxide is mainly through the following methods:

[0004] 1. A carbon dioxide cylinder is connected to an output end through a pressure reducing valve. Disadvantages: the output pressure cannot be higher than the cylinder pressure, the temperature and pressure of the output carbon dioxide are not stable enough, liquid carbon dioxide cannot be conveyed, the cylinder needs to work continuously, and metering is not possible.

[0005] 2. On the basis of method 1, a carbon dioxide booster pump is added after the pressure reducing valve, the carbon dioxide booster pump is connected to a component with temperature control function (such as a cooling pipe), and then connected to an output end to output liquid carbon dioxide with relatively stable temperature. Disadvantages: the output pressure is not stable enough, the cylinder and the carbon dioxide booster pump need to work continuously, and metering is not possible.

[0006] 3. On the basis of method 1, a carbon dioxide booster pump is added after the pressure reducing valve, the carbon dioxide booster pump is connected to a carbon dioxide storage container with temperature control function (such as a storage tank), and then connected to an output end to output liquid carbon dioxide with relatively stable temperature. Disadvantages: the carbon dioxide storage container needs to be a higher-grade pressure-resistant container than the cylinder, the safety and economy are reduced, and it is difficult to continuously convey liquid carbon dioxide (when liquid carbon dioxide needs to be conveyed, it is difficult to compress liquid carbon dioxide, and under the same temperature conditions, the density difference between high-pressure carbon dioxide liquid and low-pressure carbon dioxide liquid is not large, after reaching the carbon dioxide liquefaction pressure, a large amount of energy needs to be consumed to further compress the liquid carbon dioxide to high pressure, and the significant increase in pressure does not mean significant compression effect, such compression is not economical. Therefore, when the carbon dioxide storage container is connected to the output end, the pressure in the carbon dioxide storage container will decrease quickly, which means that the carbon dioxide storage container loses the driving force to diffuse carbon dioxide to the output end, which means that the liquid carbon dioxide needs to be continuously pressurized, increasing the complexity of operation and reducing the economy).

[0007] 4. On the basis of method 3, a pump is added after the carbon dioxide storage container, and then connected to an output end to output liquid carbon dioxide with relatively stable temperature and flow or pressure. Disadvantages: metering is not possible.

[0008] 5. On the basis of the above method, a metering device is added at any position to achieve metering purposes. The metering of a large amount of carbon dioxide is mainly by weighing metering, which has the disadvantage of being inaccurate. The metering of a small amount of carbon dioxide is mainly by flow meter or metering pump metering, which has the disadvantages of being expensive, being prone to blockage, and being prone to freezing damage when the flow meter and metering pump are used in a carbon dioxide output resulting in a temperature drop and when the temperature is lowered to maintain the temperature of the carbon dioxide.

[0009] 6. Chinese invention patent CN102133785B discloses a continuous and stable carbon dioxide injection method and device, which uses a plunger metering pump or a diaphragm pump to meter the output of carbon dioxide, which to some extent ignores the compressibility of carbon dioxide liquid and reduces the accuracy of metering.

[0010] It can be seen that the current injection and metering of carbon dioxide, especially liquid carbon dioxide, mainly has the problems of difficult stable delivery, inaccurate metering, complex operation, high cost, etc. Due to the particularity of the properties of carbon dioxide, such as easy liquefaction and corrosiveness to water, some industrial equipment needs to be additionally modified to be applicable to carbon dioxide, which is difficult and uneconomical to modify. SUMMARY

[0011] To at least partially solve one of the technical problems in the prior art, the present application provides a device and method for carbon dioxide delivery and metering, which improves the stability and safety of delivery, the convenience and accuracy of metering, the economy of the device, and the monitorability. The device for carbon dioxide delivery and metering is suitable for the fields of carbon dioxide research, utilization, capture, and storage.

[0012] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0013] In a first aspect, the present application provides a device for carbon dioxide delivery and metering, which comprises a carbon dioxide injection module, a carbon dioxide storage and metering module, a carbon dioxide pressurization and constant pressure delivery module, and a carbon dioxide output temperature control module connected by pressure-resistant pipelines,

[0014] The carbon dioxide injection module is used to inject carbon dioxide gas into the carbon dioxide storage and metering module. The carbon dioxide storage and metering module is used to store and meter carbon dioxide, and its outlet is connected to the carbon dioxide pressurization and constant pressure delivery module. The carbon dioxide pressurization and constant pressure delivery module is used for further pressurization and constant pressure delivery of liquid carbon dioxide, and its outlet is connected to the carbon dioxide output temperature control module. The carbon dioxide output temperature control module is connected to an output end for controlling the temperature of the output carbon dioxide.

[0015] The device for carbon dioxide delivery and metering as described above, further, the carbon dioxide injection module comprises a carbon dioxide cylinder, a carbon dioxide cylinder pressure reducing valve, a carbon dioxide booster pump, an air compressor,

[0016] Wherein, the outlet of the carbon dioxide cylinder is connected to the inlet of the carbon dioxide booster pump through a first pressure-resistant pipeline, the air compressor is used to provide power for the carbon dioxide booster pump, the first pressure-resistant pipeline is provided with the carbon dioxide cylinder pressure reducing valve, and the outlet of the air compressor is connected to the carbon dioxide storage and metering module through a second pressure-resistant pipeline.

[0017] The device for carbon dioxide delivery and metering as described above, further, the carbon dioxide storage and metering module comprises a first shut-off valve, a carbon dioxide metering tank, a liquid level meter, a probe type thermometer, a pressure gauge, a safety valve, a second shut-off valve and a first vent valve,

[0018] Wherein, the carbon dioxide metering tank is provided with the liquid level meter, the probe type thermometer and the pressure gauge, the second pressure-resistant pipeline is provided with the first shut-off valve, the carbon dioxide metering tank is connected with the safety valve through a third pressure-resistant pipeline; the carbon dioxide metering tank is connected with the carbon dioxide pressurization and constant pressure delivery module through a fourth pressure-resistant pipeline, the fourth pressure-resistant pipeline is provided with the second shut-off valve, and the carbon dioxide metering tank is connected with a first vent valve through a fifth pressure-resistant pipeline.

[0019] The device for carbon dioxide delivery and metering as described above, further, the carbon dioxide pressurization and constant pressure delivery module comprises a constant pressure infusion pump, a pump head cooling jacket and a cooling liquid circulating device,

[0020] Wherein, the fourth pressure-resistant pipeline is provided with the constant pressure infusion pump and the constant pressure infusion pump is arranged downstream of the second shut-off valve, and the constant pressure infusion pump is installed with the pump head cooling jacket; the cooling liquid circulating device is used to provide flowing cooling liquid for the pump head cooling jacket.

[0021] The device for carbon dioxide delivery and metering as described above, further, the carbon dioxide output temperature control module comprises a heat exchanger, a one-way valve, a third shut-off valve and a second vent valve,

[0022] Wherein, the constant pressure infusion pump is connected with an output end and a vent end through a sixth pressure-resistant pipeline, the output end is provided with the third shut-off valve, the vent end is provided with the second vent valve, the sixth pressure-resistant pipeline is provided with the heat exchanger and the third shut-off valve, the inlet of the heat exchanger is connected to the constant pressure infusion pump, and the outlet of the heat exchanger is connected to the third shut-off valve.

[0023] In a second aspect, the present application provides a method for carbon dioxide delivery and metering, which is suitable for the carbon dioxide delivery and metering device as described above, and comprises the following steps:

[0024] a preparation step, and / or a step of removing gases other than carbon dioxide in the device, and / or a carbon dioxide storage step, and / or a step of pressurizing and temperature controlling the carbon dioxide liquid, and / or a carbon dioxide delivery and metering step.

[0025] The method for carbon dioxide delivery and metering as described above, further, the step of removing gases other than carbon dioxide in the device specifically comprises:

[0026] When it is necessary to remove other gases in the device, the exhaust ends of the first pressure-resistant pipeline, the second pressure-resistant pipeline, the fourth pressure-resistant pipeline and the sixth pressure-resistant pipeline are sequentially made to form a passage, other pressure-resistant pipelines are closed, and carbon dioxide gas flows from the carbon dioxide gas cylinder, sweeps through the entire device, and then flows out through the second exhaust valve;

[0027] When it is necessary to remove other gases in the carbon dioxide gas cylinder, the first pressure-resistant pipeline, the second pressure-resistant pipeline and the third pressure-resistant pipeline are sequentially made to form a passage, other pressure-resistant pipelines are closed, and carbon dioxide gas flows from the carbon dioxide gas cylinder, sweeps through the carbon dioxide gas injection module, and then flows out through the first exhaust valve;

[0028] The sweeping is repeated multiple times.

[0029] The method for carbon dioxide delivery and metering as described above, further, the carbon dioxide storage step specifically comprises:

[0030] The first pressure-resistant pipeline and the second pressure-resistant pipeline are sequentially made to form a passage, other pressure-resistant pipelines are closed, carbon dioxide gas flows out of the carbon dioxide gas cylinder, flows through the pressure-reducing valve, and then enters the gas booster pump, the air compressor provides power for the gas booster pump, the carbon dioxide is compressed and then flows into the carbon dioxide metering tank, until the carbon dioxide is liquefied under normal temperature conditions and can always maintain a gas-liquid equilibrium state; the carbon dioxide liquid level, temperature and pressure in the carbon dioxide metering tank are monitored by the liquid level meter, the probe type thermometer and the pressure gauge; the carbon dioxide liquid level is kept higher than the position of the outlet of the carbon dioxide metering tank, and the carbon dioxide liquid does not fill the entire space of the carbon dioxide metering tank; when the temperature and pressure in the carbon dioxide metering tank are stable and the carbon dioxide liquid level reaches the expected liquid level, the first shut-off valve is closed.

[0031] The method for carbon dioxide delivery and metering as described above, further, the step of pressurizing and temperature controlling the carbon dioxide liquid specifically comprises:

[0032] The second shut-off valve is opened, to prevent the pump from not pumping due to the carbon dioxide gasification during the delivery process, the pump head cooling jacket and the circulating cooling liquid device are opened in advance, so that the constant pressure infusion pump is cooled to a temperature less than that of the carbon dioxide in the carbon dioxide metering tank, the heat exchanger temperature is set to the temperature of the required output carbon dioxide liquid, and the heat exchanger is opened; the output pressure of the constant pressure infusion pump is set, and the constant pressure infusion pump is operated, so that the path from the second shut-off valve to the third shut-off valve containing the constant pressure infusion pump is filled with carbon dioxide liquid.

[0033] The carbon dioxide delivery and metering method as described above, further, the carbon dioxide delivery and metering step specifically includes:

[0034] The temperature, pressure, and liquid level of the carbon dioxide metering tank are observed, and when they no longer change, the initial values are recorded, the third shut-off valve is opened, and the constant temperature carbon dioxide can be delivered to the required place at constant pressure; when the carbon dioxide delivery is completed, the third shut-off valve is closed;

[0035] When the device is stable, the temperature, pressure, and carbon dioxide liquid level in the carbon dioxide metering tank are read as final values;

[0036] During the delivery of carbon dioxide, according to the correspondence between the liquid level of carbon dioxide in the carbon dioxide metering tank and the volume , and the corresponding gaseous and liquid carbon dioxide densities of the carbon dioxide metering tank before and after injection , the amount of carbon dioxide delivered by the device is obtained

[0037] Compared with the prior art, the present application has the following beneficial effects:

[0038] 1. The constant temperature and constant pressure delivery of carbon dioxide and the metering of the delivery amount can be realized.

[0039] 2. The structure is simple and reliable, easy to assemble, debug, maintain, and operate.

[0040] 3. The device involved is easy to purchase.

[0041] 4. By connecting the carbon dioxide injection module, carbon dioxide storage and metering module, carbon dioxide pressurization and constant pressure delivery module, and carbon dioxide output temperature control module through pressure-resistant pipelines, the storage-metering and temperature-pressure control-delivery processes of carbon dioxide are separated, improving the flexibility of the device. The carbon dioxide injection module does not need to operate continuously. The device is easy to disassemble; the carbon dioxide injection module and the carbon dioxide storage and metering module can be disassembled and used elsewhere. Maintaining the carbon dioxide in the metering tank in a gas-liquid equilibrium state allows the pressure to be maintained near the carbon dioxide liquefaction pressure. Since the critical temperature of carbon dioxide is 7.2 MPa, the pressure in the metering tank will be lower than 7.2 MPa at room temperature, reducing the pressure resistance requirements of the carbon dioxide storage container. Furthermore, metering is not limited by the carbon dioxide conditions at the output end.

[0042] 5. The carbon dioxide metering tank can operate at room temperature without additional equipment to regulate its temperature. The pump head cooling device only needs to ensure that the carbon dioxide does not vaporize as it passes through the pump at the required pump head temperature; therefore, it only needs to be slightly lower than the temperature of the carbon dioxide metering tank. This delegates the control of the carbon dioxide output temperature to the final heat exchanger, reducing the number of temperature control units before carbon dioxide output and saving energy.

[0043] 6. By observing the liquid carbon dioxide level in the carbon dioxide metering tank, one can intuitively understand the approximate transport status of carbon dioxide.

[0044] 7. The amount of carbon dioxide transported can be calculated by using the changes in the volume and density of carbon dioxide in the carbon dioxide storage container, which is a convenient and accurate method of measurement. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the principle of a carbon dioxide conveying and metering device according to the present invention.

[0047] The components are as follows: 1. Carbon dioxide cylinder, 2. Pressure reducing valve, 3. Carbon dioxide booster pump, 4. Air compressor, 501. First shut-off valve, 6. Carbon dioxide metering tank, 7. Liquid level gauge, 8. Probe thermometer, 9. Pressure gauge, 10. Safety valve, 502. Second shut-off valve, 503. First vent valve, 11. Constant pressure infusion pump, 12. Pump head cooling jacket, 13. Coolant circulation device, 14. Heat exchanger, 15. Check valve, 504. Third shut-off valve, 505. Second vent valve. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0049] Example:

[0050] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, in the embodiments of this invention are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0051] In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0052] Example 1

[0053] This embodiment provides a method such as Figure 1 The carbon dioxide delivery and metering device shown is made of carbon dioxide-resistant material and designed to meet specifications. It includes a carbon dioxide injection module, a carbon dioxide storage and metering module, a carbon dioxide pressurization and constant-pressure delivery module, a carbon dioxide output temperature control module, and pressure-resistant piping. The pressure-resistant piping connects the carbon dioxide injection module, carbon dioxide storage and metering module, carbon dioxide pressurization and constant-pressure delivery module, carbon dioxide output temperature control module, carbon dioxide output terminal, and the components of each module.

[0054] In some embodiments, the carbon dioxide injection module is used for injecting carbon dioxide gas into the carbon dioxide storage and metering module, comprising a carbon dioxide gas cylinder 1, a pressure reducing valve 2, a carbon dioxide booster pump 3, and an air compressor 4 used to power the carbon dioxide booster pump 3.

[0055] In some embodiments, the carbon dioxide storage and metering module is used for storing and metering carbon dioxide, comprising a first shut-off valve 501, a carbon dioxide metering tank 6, a liquid level meter 7, a probe thermometer 8, a pressure gauge 9, a safety valve 10, a second shut-off valve 502, and a first vent valve 503. The liquid level meter 7, the probe thermometer 8, the pressure gauge 9, the safety valve 10, and the first shut-off valve 501 are detachably connected to the upper part of the carbon dioxide metering tank 6 by screw threads, and the second shut-off valve 502 and the first vent valve 503 are detachably connected to the lower part of the carbon dioxide metering tank 6 by screw threads. The first shut-off valve 501, the pressure gauge 9, the second shut-off valve 502, and the first vent valve 503 are connected to a convenient observation and control position through the pressure-resistant pipeline as needed. The liquid level meter 7, the probe thermometer 8, and the pressure gauge 9 are used to monitor the liquid level, temperature, and pressure in the carbon dioxide metering tank 6. The first shut-off valve 501 is the inlet of the carbon dioxide storage and metering module, connected to the carbon dioxide injection module, used to control the entry of carbon dioxide gas into the carbon dioxide storage and metering module. The carbon dioxide in the carbon dioxide metering tank 6 maintains a gas-liquid equilibrium state, with the liquid level higher than the opening position of the outlet. The liquid level meter 7 is suitable for carbon dioxide working medium. The safety valve 10 has a pressure equal to or lower than the design pressure of the carbon dioxide metering tank 6, which will automatically release pressure in the event of accidental overpressure to protect the carbon dioxide metering tank 6. The internal volume of the carbon dioxide metering tank 6 has a clear correspondence with the height. The second shut-off valve 502 is the outlet of the carbon dioxide storage and metering module, connected to the carbon dioxide pressurization and constant pressure delivery module, used to control the exit of carbon dioxide liquid from the carbon dioxide storage and metering module. During the operation of the device, the first shut-off valve 501 and the second shut-off valve 502 are not opened at the same time. The first vent valve 503 is used to vent the gas from the gas cylinder 1 to the second shut-off valve 502 when the second shut-off valve 502 is closed.

[0056] In some embodiments, the carbon dioxide pressurization and constant pressure delivery module comprises a constant pressure infusion pump 11, a pump head cooling jacket 12, and a cooling liquid circulating device 13. The constant pressure infusion pump 11 has a pressure limiting and overpressure self-protection function, and can adjust and control the pressure of the high-pressure carbon dioxide liquid output by the device. The pump head cooling jacket 12 is installed on the pump head of the constant pressure infusion pump 11, and is used to control the temperature of the pump head of the constant pressure infusion pump 11 to be less than or equal to the temperature of the carbon dioxide in the carbon dioxide metering tank 6, so as to avoid the carbon dioxide in the constant pressure infusion pump 11 from being gasified and causing the pump to not be able to deliver. The cooling liquid circulating device 13 is used to provide flowing cooling liquid to the pump head cooling jacket 12, and the cooling temperature of the cooling liquid is lower than the temperature of the carbon dioxide in the carbon dioxide metering tank 6.

[0057] In some embodiments, the carbon dioxide output temperature control module comprises a heat exchanger 14, a one-way valve 15, a third shut-off valve 504, and a second vent valve 505. The heat exchanger 14 is connected to the constant pressure infusion pump 11 at the inlet and connected to the third shut-off valve 504 at the outlet, and is used to control the temperature of the high-pressure carbon dioxide liquid output by the device. The one-way valve 15 is used to prevent the working medium from flowing back to the output end. The third shut-off valve 504 is used to cut off the connection between the device and the output end. The second vent valve 505 is used to vent the gas in the device when the third shut-off valve 504 is connected to the output end and the connection between the two is not disconnected (for example, the device needs to be vented before operation to remove impurity gas in the device).

[0058] Embodiment 2:

[0059] The present embodiment provides a method for delivering and metering carbon dioxide, which comprises the following steps:

[0060] Preparation: check the connection, sealing, and pressure resistance of the device.

[0061] Removal of gases other than carbon dioxide in the device: connect the third shut-off valve 504 to the output. Open the carbon dioxide cylinder 1, adjust the pressure reducing valve 2 to make the pressure of carbon dioxide flowing out of the carbon dioxide cylinder 1 to be 0.5 MPa, open the inlet and outlet of the carbon dioxide booster pump 3, the first shut-off valve 501, the second shut-off valve 502, the second vent valve 505, open the constant pressure infusion pump 11 but do not run, only make it form a path. After the carbon dioxide gas flows through and purges the entire device from the carbon dioxide cylinder 1 and flows out through the second vent valve 505. Repeat the purge at least three times to remove gases other than carbon dioxide in the device, prevent damage to the device, and improve the accuracy of the measurement. After the purge is complete, close the second vent valve 505. Only the carbon dioxide gas in the carbon dioxide injection module needs to be removed, only open the carbon dioxide cylinder 1, the pressure reducing valve 2, the inlet of the carbon dioxide booster pump 3, and the pressure relief valve, so that the carbon dioxide gas flows through and purges the entire carbon dioxide injection module from the carbon dioxide cylinder 1 and flows out through the pressure relief valve of the carbon dioxide booster pump 3, repeat the purge at least three times. Only the carbon dioxide gas in the carbon dioxide storage and measurement module needs to be removed, only open the carbon dioxide cylinder 1, the pressure reducing valve 2, the inlet and outlet of the carbon dioxide booster pump 3, the first shut-off valve 501, the first vent valve 502, so that the carbon dioxide gas flows through and purges the entire carbon dioxide injection module from the carbon dioxide cylinder and flows out through the first vent valve 502, repeat the purge at least three times. The gases other than carbon dioxide in the device can not be subjected to this step.

[0062] Storage of carbon dioxide: that is, injecting carbon dioxide into the carbon dioxide storage and measurement module through the carbon dioxide injection module. After the above work is completed, close the second shut-off valve 502, adjust the pressure reducing valve 2 to make the pressure of carbon dioxide flowing out of the carbon dioxide cylinder 1 to be 2 MPa. The carbon dioxide gas flows out of the carbon dioxide cylinder 1, enters the gas booster pump 3 after flowing through the pressure reducing valve 2, and the gas booster pump 3 is set to 8 MPa. The air compressor 4 is turned on in advance to provide power for the gas booster pump 3. The carbon dioxide gas is compressed at room temperature (25°C) to become carbon dioxide liquid, the carbon dioxide liquid flows into the carbon dioxide measuring tank 6 and is re-gasified into carbon dioxide gas, until the pressure in the carbon dioxide measuring tank 6 is higher than the liquefaction pressure of 6.43 MPa, the carbon dioxide begins to liquefy. During the process of injecting carbon dioxide into the carbon dioxide measuring tank 6, the liquid level, temperature, and pressure of the carbon dioxide measuring tank 6 are observed through the liquid level meter 7, the probe type thermometer 8, and the pressure gauge 9, which all increase. When the liquid level meter indicates that the liquid level almost reaches 80% of the space height in the carbon dioxide measuring tank 6, turn off the carbon dioxide cylinder 1, the pressure reducing valve 2, the carbon dioxide booster pump 3, and the first shut-off valve 501 in turn. Wait for the temperature and pressure of the carbon dioxide in the carbon dioxide measuring tank 6 to stabilize, ensure that the carbon dioxide liquid level remains higher than the opening position of the outlet of the carbon dioxide measuring tank, but the carbon dioxide liquid does not fill the carbon dioxide measuring tank 6.

[0063] Pressurization and temperature control of liquid carbon dioxide: After the above work is completed, open the second shut-off valve 502. To prevent the pump from not delivering enough liquid due to carbon dioxide vaporization during the delivery process, pre-open the pump head cooling jacket 12 and the circulating coolant device 13 to cool the pump head to a temperature lower than that of the carbon dioxide in the carbon dioxide metering tank 6. Pre-set the temperature of the heat exchanger 14 to 1°C of the required output liquid carbon dioxide and turn on the heat exchanger 14. Set the output pressure of the constant pressure delivery pump 11 to 20MPa and run the constant pressure delivery pump 11 to fill the entire passage from the second shut-off valve 502 to the third shut-off valve 504, including the constant pressure delivery pump 11, with liquid carbon dioxide.

[0064] Carbon dioxide delivery and metering: After the above work is completed, observe the liquid level of carbon dioxide metering tank 6 through level gauge 7, probe thermometer 8, and pressure gauge 9. Temperature T1 and pressure P1 are recorded as initial values ​​when they no longer change. The third shut-off valve 504 is opened, allowing carbon dioxide at 1℃ and 20MPa to be delivered to the output end under constant pressure. During the carbon dioxide delivery process, the level of carbon dioxide can be observed through level gauge 7 to determine the approximate delivery status. After the carbon dioxide delivery is completed, the third shut-off valve 504 is closed. When the system is stable, the level of carbon dioxide metering tank 6 is observed through level gauge 7, probe thermometer 8, and pressure gauge 9. Temperature T2 and pressure P2 are recorded as final values. The carbon dioxide level in the carbon dioxide metering tank is also recorded. With volume The corresponding relationships, and the densities of gaseous and liquid carbon dioxide corresponding to the temperature and pressure before and after injection in the carbon dioxide metering tank. The amount of carbon dioxide delivered by this device can be calculated. For example, carbon dioxide metering tank 6 has an inner diameter of 1m and a height of 3m. Before and after the device transports carbon dioxide, the temperature and pressure of the carbon dioxide in metering tank 6 are both 25℃ and 6.43MPa. The liquid level drops from 2m to 1m. The densities of gaseous and liquid carbon dioxide in metering tank 6 are 5.515mol·L⁻¹. -1 and 16.144 mol·L -1 The amount of carbon dioxide output by the device is... for

[0065]

[0066] Furthermore, based on the output carbon dioxide density of 23.099 mol·L... -1 The volume of carbon dioxide liquid at the output end is calculated to be...

[0067]

[0068] The above detailed description is for the specific embodiments of the present application, which are not intended to limit the patent scope of the present application, and any equivalent implementation or modification made without departing from the present application shall be included in the patent scope of the present application.

[0069] It should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0070] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0071] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, different embodiments or examples described in the present application and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0072] The above embodiments are only for the purpose of illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the essence of the present application shall be included in the protection scope of the present application.

Claims

1. A method for carbon dioxide delivery and metering, which is suitable for a carbon dioxide delivery and metering device, said device comprising a carbon dioxide injection module, a carbon dioxide storage and metering module, a carbon dioxide pressurization and constant pressure delivery module, a carbon dioxide output temperature control module, which are connected by pressure resistant pipes, said carbon dioxide injection module is used for injecting carbon dioxide gas into said carbon dioxide storage and metering module; said carbon dioxide storage and metering module is used for storing and metering carbon dioxide, and its outlet is connected to said carbon dioxide pressurization and constant pressure delivery module; said carbon dioxide pressurization and constant pressure delivery module is used for further pressurization and constant pressure delivery of liquid carbon dioxide, and its outlet is connected to said carbon dioxide output temperature control module; said carbon dioxide output temperature control module is connected to an output end for controlling the temperature of the output carbon dioxide; said carbon dioxide storage and metering module comprises a first shut-off valve, a carbon dioxide metering tank, a liquid level gauge, a probe type thermometer, a pressure gauge, a safety valve, a second shut-off valve and a first vent valve; said carbon dioxide pressurization and constant pressure delivery module comprises a constant pressure infusion pump, a pump head cooling jacket and a cooling liquid circulating device; said carbon dioxide output temperature control module comprises a heat exchanger, a one-way valve, a third shut-off valve and a second vent valve, said constant pressure infusion pump is connected to an output end and a vent end by a sixth pressure resistant pipe, said output end is provided with a third shut-off valve, said vent end is provided with said second vent valve, said heat exchanger and said third shut-off valve are provided on said sixth pressure resistant pipe, the inlet of said heat exchanger is connected to said constant pressure infusion pump, and the outlet of said heat exchanger is connected to said third shut-off valve; characterized in that said method comprises the following steps: a preparation step, a step of removing gases other than carbon dioxide in said device, a carbon dioxide storage step, a pressurization and temperature control step of carbon dioxide liquid, and a carbon dioxide delivery and metering step, wherein said carbon dioxide delivery and metering step specifically comprises: observing the temperature, pressure and liquid level of the carbon dioxide metering tank, recording them as initial values when they no longer change, opening the third shut-off valve, and constant temperature carbon dioxide can be delivered to the required place by constant pressure; when the carbon dioxide delivery is completed, the third shut-off valve is closed; reading the temperature, pressure and carbon dioxide liquid level in the carbon dioxide metering tank as final values when said device is stable; During the carbon dioxide transportation process, the carbon dioxide level in the carbon dioxide metering tank is monitored. With volume The corresponding relationships, and the densities of gaseous and liquid carbon dioxide corresponding to the temperature and pressure before and after injection in the carbon dioxide metering tank. The amount of carbon dioxide delivered by the device is obtained. .

2. The method of claim 1, wherein, said carbon dioxide injection module comprises a carbon dioxide cylinder, a carbon dioxide cylinder pressure reducing valve, a carbon dioxide booster pump, an air compressor, wherein the outlet of said carbon dioxide cylinder is connected to the inlet of said carbon dioxide booster pump by a first pressure resistant pipe, said air compressor is used to provide power for said carbon dioxide booster pump, said pressure reducing valve is provided on said first pressure resistant pipe, and the outlet of said air compressor is connected to said carbon dioxide storage and metering module by a second pressure resistant pipe.

3. The method of claim 2, wherein, The carbon dioxide metering tank is provided with the liquid level meter, the probe thermometer and the pressure gauge, the second pressure resistant pipeline is provided with the first shut-off valve, and the carbon dioxide metering tank is connected with the safety valve through a third pressure resistant pipeline; the carbon dioxide metering tank is connected with the carbon dioxide pressurization and constant pressure delivery module through a fourth pressure resistant pipeline, the fourth pressure resistant pipeline is provided with the second shut-off valve, and the carbon dioxide metering tank is connected with a first vent valve through a fifth pressure resistant pipeline.

4. The method of claim 3, wherein, The fourth pressure resistant pipeline is provided with the constant pressure infusion pump, and the constant pressure infusion pump is arranged downstream of the second shut-off valve; the constant pressure infusion pump is provided with the pump head cooling jacket; and the cooling liquid circulating device is used for providing flowing cooling liquid for the pump head cooling jacket.

5. The method of claim 1, wherein, The step of removing the gas in the device other than carbon dioxide specifically comprises: When it is required to remove the gas in the device other than carbon dioxide, the emptying ends of the first pressure resistant pipeline, the second pressure resistant pipeline, the fourth pressure resistant pipeline and the sixth pressure resistant pipeline are sequentially made to form a passage, and other pressure resistant pipelines are closed, so that the carbon dioxide gas flows from the carbon dioxide cylinder, sweeps through the whole device and then flows out through the second vent valve; When it is required to remove other gas in the carbon dioxide cylinder, the first pressure resistant pipeline, the second pressure resistant pipeline and the third pressure resistant pipeline are sequentially made to form a passage, and other pressure resistant pipelines are closed, so that the carbon dioxide gas flows from the carbon dioxide cylinder, sweeps through the carbon dioxide injection module and then flows out through the first vent valve; The step of repeatedly sweeping is repeatedly performed.

6. The method of claim 2, wherein, The step of storing the carbon dioxide specifically comprises: The first pressure resistant pipeline and the second pressure resistant pipeline are sequentially made to form a passage, and other pressure resistant pipelines are closed, so that the carbon dioxide gas flows out of the carbon dioxide cylinder, flows through the pressure reducing valve and then enters the carbon dioxide booster pump, the air compressor provides power for the carbon dioxide booster pump, the carbon dioxide is compressed and then flows into the carbon dioxide metering tank, until the carbon dioxide is liquefied under normal temperature conditions and can always maintain a gas-liquid equilibrium state; the carbon dioxide liquid level, temperature and pressure in the carbon dioxide metering tank are monitored by the liquid level meter, the probe thermometer and the pressure gauge; the carbon dioxide liquid level is kept higher than the position of the outlet of the carbon dioxide metering tank, and the carbon dioxide liquid does not fill the whole space of the carbon dioxide metering tank; and the first shut-off valve is closed when the temperature and pressure in the carbon dioxide metering tank are stable and the carbon dioxide liquid level reaches an expected liquid level.

7. The method of claim 1, wherein, The step of pressurizing and temperature controlling the carbon dioxide liquid specifically comprises: The second shut-off valve is opened, the pump head cooling jacket and the cooling liquid circulating device are opened in advance to prevent the carbon dioxide from being gasified during the delivery process, so that the constant pressure infusion pump is cooled to a temperature lower than that of the carbon dioxide in the carbon dioxide metering tank, the temperature of the heat exchanger is set to the temperature of the required output carbon dioxide liquid, and the heat exchanger is opened; the output pressure of the constant pressure infusion pump is set, and the constant pressure infusion pump is operated, so that the passage from the second shut-off valve to the third shut-off valve containing the constant pressure infusion pump is all filled with the carbon dioxide liquid.

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