Exhaust emptying control system, method and device of liquid carbon dioxide storage tank

Abstract

The invention is applicable to the technical field of automatic control, and provides an exhaust emptying control system, method and device for a liquid CO2 storage tank, a sensor is mounted in the liquid CO2 storage tank, and the exhaust opportunity of the liquid CO2 storage tank is determined on the basis of data acquired by the sensor; according to the liquid CO2 storage tank exhaust control method and device, automatic exhaust control over the liquid CO2 storage tank is achieved according to the actual operation condition of the liquid CO2 storage tank, it can be guaranteed that the liquid CO2 storage tank is not damaged by overpressure, the overall exhaust efficiency of the liquid CO2 storage tank can be improved, and the labor cost is reduced. Besides, an exhaust port of the liquid CO2 storage tank is connected with an exhaust device provided with a honeycomb type pipeline and a labyrinth type pipeline, the honeycomb type pipeline can move the frequency of airflow injection noise to high frequency or ultrahigh frequency which cannot be recognized by human ears, and the labyrinth type pipeline can enable flowing-through gas CO2 to generate reverse turbulent flow. Therefore, noise generated when the liquid CO2 storage tank is subjected to exhaust emptying operation can be effectively weakened.

Description

Technical Field

[0001] The present application belongs to the field of automatic control technology, and in particular, relates to an exhaust and venting control system, method and device for a liquid carbon dioxide storage tank. Background Art

[0002] In actual production activities, the temperature inside the liquid carbon dioxide (CO2) storage tank will increase with the increase of the outside temperature, and the liquid CO2 in the tank will vaporize, which will increase the pressure inside the tank. If the pressure inside the tank exceeds the maximum pressure of the tank, the tank will be damaged by overpressure. Therefore, it is necessary to vent and empty the liquid CO2 tank from time to time to discharge the gas CO2 in the tank into the air to reduce the risk of damage to the tank by overpressure.

[0003] However, liquid CO2 storage tanks generate a lot of noise when being vented, and workers are required to manually open the exhaust valve from time to time to vent the liquid CO2 storage tanks. This is not only cumbersome and labor-intensive, but also difficult to accurately grasp the appropriate timing of the venting operation, resulting in low overall efficiency of the venting operation. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a gas exhaust and venting control system, method and device for a liquid carbon dioxide storage tank to solve the technical problems of low overall efficiency, high labor cost and high noise in the existing gas exhaust and venting operations of liquid CO2 storage tanks.

[0005] In a first aspect, an embodiment of the present application provides an exhaust and venting control system for a liquid carbon dioxide storage tank, comprising: an exhaust and venting control device, an exhaust valve, a pressure sensor, a liquid level meter, and an exhaust device;

[0006] The pressure sensor is used to collect the pressure value inside the liquid CO2 storage tank;

[0007] The liquid level meter is used to collect the liquid level value inside the liquid CO2 storage tank;

[0008] The exhaust valve is used to control the opening and closing of the exhaust port of the liquid CO2 storage tank;

[0009] The exhaust port is communicated with the air inlet of the exhaust device, and the air inlet and the air outlet of the exhaust device are communicated through a low-noise exhaust duct; the low-noise exhaust duct comprises a honeycomb duct and a labyrinth duct sequentially arranged between the air inlet and the air outlet; a plurality of evenly distributed small holes are opened on the pipe wall of the honeycomb duct; the labyrinth duct comprises a multi-stage baffle section;

[0010] The exhaust and venting control device is communicatively connected with the pressure sensor, the liquid level gauge and the exhaust valve, and is used to obtain the current pressure value and the current liquid level value inside the liquid CO2 storage tank; determine the safety pressure margin of the liquid CO2 storage tank corresponding to the current liquid level value; determine the current exhaust pressure threshold of the liquid CO2 storage tank according to the maximum pressure value of the liquid CO2 storage tank and the safety pressure margin; and when the current pressure value is equal to or greater than the current exhaust pressure threshold, control the exhaust valve to open, so as to exhaust the liquid CO2 storage tank through the exhaust device.

[0011] In an optional implementation of the first aspect, the exhaust and venting control device is specifically used to: determine a correction coefficient of the pressure margin according to the current liquid level value; and determine the product of a preset basic pressure margin and the correction coefficient as the safety pressure margin.

[0012] In an optional implementation of the first aspect, the exhaust venting control device is further used to: determine a correction coefficient of the pressure margin according to the following formula:

[0013]

[0014] Wherein, k is the correction coefficient of the pressure margin, L dq is the current liquid level value, L zd is the minimum safe liquid level value of the liquid CO2 storage tank, L zg It is the maximum safe liquid level value of the liquid CO2 storage tank.

[0015] In an optional implementation of the first aspect, the exhaust venting control device is specifically used to: determine the difference between the maximum pressure value and the safety pressure margin as the current exhaust pressure threshold.

[0016] In an optional implementation of the first aspect, the exhaust gas venting control system further includes a temperature sensor; the temperature sensor is used to collect the temperature value inside the liquid CO2 storage tank;

[0017] The exhaust and venting control device is also specifically used to: obtain the exhaust temperature value and exhaust pressure value inside the liquid CO2 storage tank during the exhaust process; determine the saturated vapor pressure value of CO2 corresponding to the exhaust temperature value; and when the exhaust pressure value is equal to or less than the saturated vapor pressure value, control the exhaust valve to close to stop venting the liquid CO2 storage tank.

[0018] In an optional implementation of the first aspect, the length of the honeycomb pipe is determined by the following formula:

[0019]

[0020] Among them, L h is the length of the honeycomb pipe, K h is the preset length adjustment coefficient, D1 is the diameter of the honeycomb pipe, ΔP1 is the preset pressure drop of the honeycomb pipe, and P max is the maximum pressure value of the liquid CO2 storage tank.

[0021] In an optional implementation of the first aspect, the diameter of the small holes on the tube wall of the honeycomb tube is determined by the following formula:

[0022]

[0023] Wherein, d is the diameter of the small hole on the wall of the honeycomb pipe, C d is the aperture correction factor;

[0024] The number of small holes on the wall of the honeycomb pipe is determined by the following formula:

[0025]

[0026] Wherein, N is the number of small holes on the wall of the honeycomb pipe, and ceil() is a rounding up function.

[0027] In an optional implementation of the first aspect, the length of each level of baffle section included in the labyrinth pipeline can be determined by the following formula:

[0028]

[0029] Among them, L m is the length of each baffle section, K m is the baffle efficiency coefficient of the labyrinth pipeline, D2 is the diameter of the labyrinth pipeline, ΔP2 is the preset pressure drop of the labyrinth pipeline, P max is the maximum pressure-bearing value of the liquid CO2 storage tank, and ΔP1 is the preset pressure drop of the honeycomb pipeline.

[0030] In a second aspect, an embodiment of the present application provides a method for controlling exhaust and venting of a liquid carbon dioxide storage tank, comprising:

[0031] Get the current pressure value and current liquid level value inside the liquid CO2 storage tank;

[0032] Determine the safety pressure margin of the liquid CO2 storage tank corresponding to the current liquid level value;

[0033] Determining a current exhaust pressure threshold of the liquid CO2 storage tank according to the maximum pressure bearing value of the liquid CO2 storage tank and the safety pressure margin;

[0034] When the current pressure value is equal to or greater than the current exhaust pressure threshold, the exhaust valve is controlled to open, so as to exhaust the liquid CO2 storage tank through the exhaust device.

[0035] In an optional implementation of the second aspect, determining a safety pressure margin of the liquid CO2 storage tank corresponding to the current liquid level value includes:

[0036] Determine a correction coefficient of the pressure margin according to the current liquid level value;

[0037] The product of a preset basic pressure margin and the correction coefficient is determined as the safety pressure margin.

[0038] In an optional implementation of the second aspect, determining a correction coefficient of the pressure margin according to the current liquid level value includes:

[0039] Determine the correction factor for the pressure margin according to the following formula:

[0040]

[0041] Wherein, k is the correction coefficient of the pressure margin, L dq is the current liquid level value, L zd is the minimum safe liquid level value of the liquid CO2 storage tank, L zg It is the maximum safe liquid level value of the liquid CO2 storage tank.

[0042] In an optional implementation of the second aspect, determining a current exhaust pressure threshold of the liquid CO2 storage tank according to the maximum pressure bearing value of the liquid CO2 storage tank and the safety pressure margin includes:

[0043] The difference between the maximum pressure bearing value and the safety pressure margin is determined as the current exhaust pressure threshold.

[0044] In an optional implementation of the second aspect, the exhaust venting control method further includes:

[0045] Acquire the exhaust temperature and pressure of the liquid CO2 storage tank during the exhaust process;

[0046] Determine the saturated vapor pressure value of CO2 corresponding to the exhaust temperature value;

[0047] When the exhaust pressure value is equal to or less than the saturated vapor pressure value, the exhaust valve is controlled to close to stop exhausting the liquid CO2 storage tank.

[0048] In a third aspect, an embodiment of the present application provides a gas exhaust and venting control device for a liquid CO2 storage tank, comprising a memory and a computer program stored in the memory and executable on a processor, wherein when the processor executes the computer program, it implements the gas exhaust and venting control method for a liquid CO2 storage tank as described in any optional implementation of the second aspect above.

[0049] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the exhaust and venting control method for a liquid CO2 storage tank as described in any optional implementation of the second aspect above is implemented.

[0050] The exhaust venting control system, method, device and computer-readable storage medium for a liquid CO2 storage tank provided by the embodiments of the present application have the following beneficial effects:

[0051] The embodiment of the present application realizes automatic exhaust control of the liquid CO2 storage tank according to the actual operation status of the liquid CO2 storage tank by installing a sensor inside the liquid carbon dioxide storage tank and determining the exhaust timing and the exhaust stop timing of the liquid CO2 storage tank based on the data collected by the sensor, which can not only ensure that the liquid CO2 storage tank is not damaged by overpressure, but also improve the overall exhaust efficiency of the liquid CO2 storage tank and reduce labor costs. In addition, by setting an exhaust device including a honeycomb pipe and a labyrinth pipe, since a plurality of evenly distributed small holes are opened on the honeycomb pipe, each small hole will cause the air flow in the pipe to produce pressure loss and velocity attenuation. Therefore, when the gas CO2 discharged from the liquid CO2 storage tank flows through the honeycomb pipe, under the action of the plurality of small holes on the pipe wall, the frequency of the airflow injection noise will move to a high frequency or ultra-high frequency that cannot be recognized by the human ear, thereby reducing the airflow injection noise; at the same time, the labyrinth pipe behind the honeycomb pipe can cause the gas CO2 flowing through to produce reverse turbulence, thereby reducing the flow rate of the gas CO2, and further reducing the airflow injection noise generated when the liquid CO2 storage tank is exhausted and emptied. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0053] Figure 1 A schematic diagram of the structure of an exhaust and venting control system for a liquid CO2 storage tank provided in an embodiment of the present application;

[0054] Figure 2A schematic diagram of the structure of an exhaust device provided in an embodiment of the present application;

[0055] Figure 3 A schematic flow chart of a method for controlling exhaust and venting of a liquid CO2 storage tank provided in an embodiment of the present application;

[0056] Figure 4 A schematic diagram of the implementation process of S302 in a method for controlling exhaust and venting of a liquid CO2 storage tank provided in an embodiment of the present application;

[0057] Figure 5 A schematic flow chart of a method for controlling exhaust and venting of a liquid CO2 storage tank provided in another embodiment of the present application;

[0058] Figure 6 A schematic diagram of the structure of an exhaust venting control device provided in an embodiment of the present application;

[0059] Figure 7 A schematic structural diagram of an exhaust venting control device provided in another embodiment of the present application. DETAILED DESCRIPTION

[0060] It should be noted that the terms used in the embodiments of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application. In the description of the embodiments of the present application, unless otherwise specified, "multiple" refers to two or more than two, and "at least one", "one or more" refers to one, two or more. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, it is defined that the "first" and "second" features can explicitly or implicitly include one or more of the features.

[0061] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0062] In order to store or transport carbon dioxide (CO2) safely and stably, CO2 is usually stored in a liquid form in a dedicated storage tank (referred to as a liquid CO2 storage tank) to facilitate subsequent production activities. In actual production activities, when the outside temperature rises, the temperature inside the liquid CO2 storage tank will rise accordingly, and the liquid CO2 will vaporize, which will increase the pressure inside the tank. If the pressure inside the tank exceeds the maximum pressure of the tank, the tank will be damaged by overpressure. Therefore, it is necessary to vent and empty the liquid CO2 storage tank from time to time to discharge the gas CO2 in the tank into the air, reduce the pressure inside the tank, and thereby reduce the risk of damage to the tank by overpressure.

[0063] However, liquid CO2 storage tanks generate a lot of noise when exhausting and venting, and this noise is a type of fluid injection noise. Specifically, when the ratio of the pressure inside the liquid CO2 storage tank to the atmospheric pressure is equal to or greater than 1.89, the gas flow rate at the exhaust port will reach the speed of sound, which will produce a lot of airflow injection noise. This noise will not only affect the normal life of residents near the work area, but also cause potential harm to the hearing of workers. In addition, the prior art usually requires workers to manually open the exhaust valve from time to time to exhaust and vent the liquid CO2 storage tank, which is not only cumbersome to operate and has high labor costs; it is also difficult for humans to accurately grasp the appropriate time for the exhaust and venting operation, resulting in low overall efficiency of the exhaust and venting operation.

[0064] In view of this, in order to reduce the labor cost required for the exhaust and venting operation of the liquid CO2 storage tank, improve the overall efficiency of the exhaust and venting operation, and reduce the noise generated by the exhaust and venting operation, the embodiment of the present application first provides an exhaust and venting control system for the liquid CO2 storage tank. Figure 1 , is a schematic diagram of the structure of a gas exhaust control system for a liquid CO2 storage tank provided in an embodiment of the present application. Figure 1 As shown, the exhaust and venting control system may include: an exhaust and venting control device 11, an exhaust valve 12, a temperature sensor 13, a pressure sensor 14, a liquid level meter 15 and an exhaust device 16.

[0065] The exhaust valve 12 may be installed at the exhaust port 101 of the liquid CO2 storage tank 10 to control the opening and closing of the exhaust port 101. For example, the exhaust valve 12 may open the exhaust port 101 to exhaust the liquid CO2 storage tank 10 and discharge the excess gas CO2 in the liquid CO2 storage tank 10 into the air when receiving an opening signal from the exhaust and venting control device 11. For another example, the exhaust valve 12 may close the exhaust port 101 to stop exhausting the liquid CO2 storage tank 10 when receiving a closing signal from the exhaust and venting control device 11.

[0066] For example, the exhaust valve 12 may be an electromagnetic exhaust valve or a pneumatic angle seat exhaust valve with strong low temperature and high pressure resistance. The specific type of the exhaust valve 12 is not limited in the embodiment of the present application.

[0067] The number of the temperature sensors 13 may be at least two, and one of the at least two temperature sensors 13 may be installed at the top position inside the liquid CO2 storage tank to collect the temperature value of the gas space inside the liquid CO2 storage tank. Another of the at least two temperature sensors 13 may be installed at the bottom position inside the liquid CO2 storage tank to collect the temperature value of the liquid space inside the liquid CO2 storage tank. The other of the at least two temperature sensors 13 may be installed at any position inside the liquid CO2 storage tank, so that when the liquid level of the liquid CO2 inside the liquid CO2 storage tank is higher than the installation height of the other temperature sensors 13, the other temperature sensors 13 may be used to collect the temperature value of the liquid space inside the liquid CO2 storage tank; when the liquid level of the liquid CO2 inside the liquid CO2 storage tank is lower than the installation height of the other temperature sensors 13, the other temperature sensors 13 may be used to collect the temperature value of the gas space inside the liquid CO2 storage tank. Among them, the gas space refers to the space occupied by the gas CO2 in the liquid CO2 storage tank, and the liquid space refers to the space occupied by the liquid CO2 in the liquid CO2 storage tank.

[0068] For example, the temperature sensor 13 may be a thermal resistor temperature sensor or a thermocouple temperature sensor with strong low temperature and high pressure resistance performance. The specific type of the temperature sensor 13 is not particularly limited in the present embodiment.

[0069] The pressure sensor 14 can be installed at the top of the liquid CO2 storage tank to collect the pressure value inside the liquid CO2 storage tank. The pressure value inside the liquid CO2 storage tank can be used to indicate the gas pressure of the gas CO2 in the liquid CO2 storage tank.

[0070] For example, the pressure sensor 14 may be a piezoresistive pressure sensor, a capacitive pressure sensor, or a diffused silicon pressure sensor with strong low temperature and high pressure resistance. The specific type of the pressure sensor 14 is not particularly limited in the present embodiment.

[0071] The installation position of the liquid level meter 15 can be determined according to the specific type of the liquid level meter 15. For example, when the liquid level meter 15 is an ultrasonic level meter or a radar level meter, the liquid level meter 15 can be installed at the top position inside the liquid CO2 storage tank. When the liquid level meter 15 is a static pressure level meter, the liquid level meter 15 can be installed at the bottom position inside the liquid CO2 storage tank. When the liquid level meter 15 is a magnetic flap level meter, the liquid level meter 15 can be installed on the side wall inside the liquid CO2 storage tank. The embodiment of the present application does not specifically limit the specific type and installation position of the liquid level meter 15.

[0072] A communication connection, for example, a wireless communication connection, is established between the exhaust and venting control device 11 and the exhaust valve 12 , the temperature sensor 13 , the pressure sensor 14 and the liquid level meter 15 .

[0073] The exhaust and venting control device 11 can be used to obtain corresponding sensor data from the temperature sensor 13, the pressure sensor 14 and the liquid level meter 15, determine the exhaust timing and the exhaust stop timing of the liquid CO2 storage tank 10 based on the obtained sensor data, and realize automatic exhaust control of the liquid CO2 storage tank 10 by controlling the opening and closing of the exhaust valve 12.

[0074] It should be noted that the specific process involved in the automatic exhaust control of the liquid CO2 storage tank 10 by the exhaust and venting control device 11 can be referred to the description in the subsequent method embodiments and will not be described in detail here.

[0075] In some embodiments, the exhaust venting control device 11 may specifically be an electronic device, such as a mobile phone, a tablet computer, or a laptop computer.

[0076] In other embodiments, the exhaust venting control device 11 may specifically be a control module, which may be, for example, a field-programmable gate array (FPGA), a programmable automation controller (PAC), or a programmable logic controller (PLC).

[0077] See also Figure 2 , is a schematic diagram of the structure of an exhaust device provided in an embodiment of the present application. Figure 2 (a) is a perspective view of the exhaust device 16. Figure 2 (b) is a top view of the exhaust device 16. Figure 2As shown in (a) in the figure, the exhaust device 16 may include a housing 160. Exemplarily, the housing 160 may be a cubic structure, such as a rectangular parallelepiped structure. An air inlet 161 and an air outlet 162 may be provided on the housing 160. The air inlet 161 and the air outlet 162 may be connected via a low-noise exhaust pipe 163 disposed inside the housing 160, and the air inlet 161 and the exhaust port 101 of the liquid CO2 storage tank 10 may be connected via a common exhaust pipe.

[0078] like Figure 2 As shown in (b), the low noise exhaust duct 163 may include a honeycomb duct 1631 and a labyrinth duct 1632. The honeycomb duct 1631 and the labyrinth duct 1632 are sequentially connected between the air inlet 161 and the air outlet 162, that is, the air inlet of the honeycomb duct 1631 is the air inlet 161 of the low noise exhaust duct 163, the air outlet of the honeycomb duct 1631 is connected to the air inlet of the labyrinth duct 1632, and the air outlet of the labyrinth duct 1632 is the air outlet 162 of the low noise exhaust duct 163.

[0079] The honeycomb pipe 1631 refers to a pipe with a plurality of small holes opened on the pipe wall, and the plurality of small holes may be evenly distributed on the pipe wall of the honeycomb pipe 1631 .

[0080] The diameter of the honeycomb pipe 1631 may be the same as the diameter of the air inlet 161 of the exhaust device 16 , and the diameter of the air inlet 161 may be the same as the diameter of the exhaust port 101 of the liquid CO 2 storage tank 10 .

[0081] The length of the honeycomb pipe 1631, the size and number of the small holes on the pipe wall can be determined according to the preset pressure drop of the honeycomb pipe 1631. Among them, the preset pressure drop of the honeycomb pipe 1631 is used to describe the difference between the gas pressure at the inlet of the preset honeycomb pipe 1631 and the gas pressure at the outlet. Exemplarily, the preset pressure drop of the honeycomb pipe 1631 can be 60% to 70% of the total pressure drop of the exhaust device 16. The total pressure drop of the exhaust device 16 refers to the difference between the gas pressure at the inlet 161 of the exhaust device 16 and the gas pressure at the outlet 162. Exemplarily, the total pressure drop of the exhaust device 16 can be the difference between the maximum pressure value of the liquid CO2 storage tank 10 and the expected pressure value of the outlet 162 of the exhaust device 16. In practical applications, in order to reduce the noise when the liquid CO2 storage tank 10 is exhausted, the expected pressure value of the outlet 162 of the exhaust device 16 can be a preset multiple of the atmospheric pressure value, and the preset multiple can be greater than 1 and less than 1.3.

[0082] For example, the length of the honeycomb pipe 1631 can be determined according to the following formula (1):

[0083]

[0084] Among them, L h is the length of the honeycomb pipe 1631, D1 is the diameter of the honeycomb pipe 1631, ΔP1 is the preset pressure drop of the honeycomb pipe 1631, P max is the maximum pressure value of the liquid CO2 storage tank 10. K h is a preset length adjustment coefficient obtained according to fluid dynamics theory and experiments, which is related to the diameter of the pipeline, the flow rate and pressure of the gas in the pipeline, etc. For example, K h The value range can be 10 to 20.

[0085] The diameter of the small holes on the wall of the honeycomb pipe 1631 can be determined by the following formula (2):

[0086]

[0087] Wherein, d is the diameter of the small hole on the wall of the honeycomb pipe 1631. d is the aperture correction coefficient, which can be adjusted according to the actual noise reduction requirements. For example, C d The value range of can be 0.05~0.1.

[0088] The number of small holes on the wall of the honeycomb pipe 1631 can be determined by the following formula (3):

[0089]

[0090] Wherein, N is the number of small holes on the wall of the honeycomb pipe 1631, and ceil() is a rounding up function.

[0091] Exemplarily, the diameter of the labyrinth-type pipe 1632 may be the same as the diameter of the honeycomb-type pipe 1631 .

[0092] The labyrinth duct 1632 may be composed of multiple levels of baffles. The total number of baffles of the labyrinth duct 1632 may be determined based on the preset pressure drop of the labyrinth duct 1632 and the pressure drop that each level of baffles needs to bear. For example, the total number of baffles of the labyrinth duct 1632 may be the ratio of the preset pressure drop of the labyrinth duct 1632 to the pressure drop that each level of baffles needs to bear. The preset pressure drop of the labyrinth duct 1632 may be the difference between the total pressure drop of the exhaust device 16 and the preset pressure drop of the honeycomb duct 1631.

[0093] The length of each baffle section can be determined by the following formula (4):

[0094]

[0095] Among them, L m is the length of each baffle section, K m is the baffle efficiency coefficient of the labyrinth pipe 1632 , D2 is the diameter of the labyrinth pipe 1632 , and ΔP2 is the preset pressure drop of the labyrinth pipe 1632 .

[0096] In specific applications, K m The noise reduction efficiency of the baffle section can be obtained through experiments and simulations. m The value range can be 2 to 3.

[0097] From the above, it can be seen that the embodiment of the present application installs a temperature sensor, a pressure sensor and a liquid level gauge inside the liquid CO2 storage tank, and determines the exhaust timing and the timing to stop exhausting the liquid CO2 storage tank based on the data collected by each sensor, thereby realizing automatic exhaust control of the liquid CO2 storage tank according to the actual operating conditions of the liquid CO2 storage tank, which can not only ensure that the liquid CO2 storage tank is not damaged by overpressure, but also improve the overall exhaust efficiency of the liquid CO2 storage tank and reduce labor costs. In addition, by setting up an exhaust device including a honeycomb pipe and a labyrinth pipe, since a plurality of evenly distributed small holes are opened on the honeycomb pipe, each small hole will cause pressure loss and velocity attenuation of the air flow in the pipe. Therefore, when the gas CO2 discharged from the liquid CO2 storage tank flows through the honeycomb pipe, under the action of the plurality of small holes on the pipe wall, the frequency of the airflow injection noise will shift to a high frequency or ultra-high frequency that cannot be recognized by the human ear, thereby reducing the airflow injection noise; at the same time, the labyrinth pipe behind the honeycomb pipe can cause the gas CO2 flowing through to produce reverse turbulence, thereby reducing the flow rate of the gas CO2 and further reducing the airflow injection noise; by reasonably setting the length of the honeycomb pipe, the number and diameter of the small holes on the pipe wall of the honeycomb pipe, the total number of baffle sections included in the labyrinth pipe, and the length of each baffle section, the upper limit value of the pressure of the gas CO2 finally discharged by the exhaust device can be close to the atmospheric pressure, thereby effectively reducing the airflow injection noise generated when the liquid CO2 storage tank is exhausted and vented.

[0098] The embodiment of the present application also provides a method for controlling the exhaust and venting of a liquid CO2 storage tank, and the execution body of the exhaust and venting control method can be the exhaust and venting control device 11 mentioned above. For example, Figure 3 A schematic flow chart of a method for controlling exhaust and venting of a liquid CO2 storage tank provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, the exhaust venting control method may include S301 to S304, which are described in detail as follows:

[0099] S301, obtaining the current pressure value and current liquid level value inside the liquid CO2 storage tank.

[0100] The exhaust and venting control device 11 can obtain the current pressure value inside the liquid CO2 storage tank from the pressure sensor 14 installed inside the liquid CO2 storage tank. Exemplarily, the exhaust and venting control device 11 can obtain the current pressure value inside the liquid CO2 storage tank from the pressure sensor 14 once every first time period.

[0101] The exhaust control device 11 can obtain the current liquid level value inside the liquid CO2 storage tank from the liquid level meter 15 installed inside the liquid CO2 storage tank. Exemplarily, the exhaust control device 11 can obtain the current liquid level value inside the liquid CO2 storage tank from the liquid level meter 15 once every first time period.

[0102] Among them, the first duration can be set according to actual needs and is not particularly limited here.

[0103] S302, determining the safety pressure margin of the liquid CO2 storage tank corresponding to the current liquid level value.

[0104] The safety pressure margin can be determined based on the current liquid level value and the preset basic pressure margin.

[0105] The basic pressure margin is to ensure that the liquid CO2 storage tank is not damaged by overpressure during actual operation, and is a pressure margin reserved between the maximum pressure value of the liquid CO2 storage tank and the maximum working pressure value theoretically allowed for the liquid CO2 storage tank, that is, the basic pressure margin is used to represent the difference between the maximum pressure value of the liquid CO2 storage tank and the maximum working pressure value theoretically allowed for the liquid CO2 storage tank. The maximum working pressure value theoretically allowed for the liquid CO2 storage tank is less than the maximum pressure value of the liquid CO2 storage tank.

[0106] Among them, the maximum pressure value of the liquid CO2 storage tank is used to indicate the maximum pressure that the liquid CO2 storage tank can withstand, which is related to the specifications of the liquid CO2 storage tank (for example, volume, material, etc.).

[0107] It should be noted that the basic pressure margin is a pre-set fixed pressure value, which does not change with the actual working conditions inside the liquid CO2 storage tank. In some embodiments, the basic pressure margin can be determined according to the maximum pressure value of the liquid CO2 storage tank. Exemplarily, the basic pressure margin can be 20% to 30% of the maximum pressure value. For example, assuming that the maximum pressure value of the liquid CO2 storage tank is 4 megapascals (MPa), the basic pressure margin can be 0.8MPa or 1MPa, etc.

[0108] It is understandable that in actual applications, the liquid level height of the liquid CO2 in the liquid CO2 storage tank will affect the rate of change of the pressure of the gas CO2. Specifically, when the liquid level of the liquid CO2 is high, the gas space in the liquid CO2 storage tank is small, so that the rate of change of the pressure of the gas CO2 is relatively fast; when the liquid level of the liquid CO2 is low, the gas space in the liquid CO2 storage tank is large, so that the rate of change of the pressure of the gas CO2 is relatively slow. Therefore, in order to be able to more accurately control the exhaust and venting operation of the liquid CO2 storage tank and ensure that the liquid CO2 storage tank will not be damaged by overpressure, the basic pressure margin can be adjusted according to the current liquid level value of the liquid CO2 storage tank to obtain a safety pressure margin that matches the current liquid level value, so as to control the exhaust of the liquid CO2 storage tank according to the safety pressure margin.

[0109] Based on this, in a specific implementation, S302 may include: Figure 4 S3021~S3022 shown are described in detail as follows:

[0110] S3021, determine the correction coefficient of the pressure margin according to the current liquid level value.

[0111] It can be understood that, since the pressure change rate of the gas CO2 in the liquid CO2 storage tank is faster when the current liquid level value is larger, more pressure margin can be reserved; when the current liquid level value is smaller, the pressure change rate of the gas CO2 in the liquid CO2 storage tank is slower, so less pressure margin can be reserved to ensure that the pressure value inside the liquid CO2 storage tank will never reach the maximum pressure value of the liquid CO2 storage tank, thereby reducing the risk of the liquid CO2 storage tank being damaged by overpressure.

[0112] Exemplarily, the exhaust gas discharge control device 11 may determine the correction coefficient of the pressure margin by the following formula (5):

[0113]

[0114] Where k is the correction factor of pressure margin, L dq is the current liquid level value of the liquid CO2 storage tank, L zd is the minimum safe liquid level value of the liquid CO2 storage tank, L zg It is the maximum safe liquid level value of the liquid CO2 storage tank.

[0115] It should be noted that the minimum safe liquid level value and the maximum safe liquid level value can be set according to actual needs. For example, the minimum safe liquid level value can be 10% of the height of the liquid CO2 storage tank, and the maximum safe liquid level value can be 85% of the height of the liquid CO2 storage tank.

[0116] According to the above formula (1), as the current liquid level value inside the liquid CO2 storage tank increases, the correction coefficient of the pressure margin will increase accordingly. In the case of, the correction factor of pressure margin is equal to 1; In the case of , the correction coefficient of pressure margin is less than 1; In all cases, the correction factor of the pressure margin is greater than 1.

[0117] S3022: Determine the product of the preset basic pressure margin and the correction coefficient as the safety pressure margin.

[0118] It is understandable that, as the current liquid level value inside the liquid CO2 storage tank increases, the correction coefficient of the pressure margin will increase accordingly, and therefore the safety pressure margin will also increase accordingly.

[0119] S303, determining a current exhaust pressure threshold of the liquid CO2 storage tank according to the maximum pressure value and the safety pressure margin of the liquid CO2 storage tank.

[0120] In a specific implementation, the exhaust and venting control device 11 may determine the difference between the maximum pressure value of the liquid CO2 storage tank and the safety pressure margin as the current exhaust pressure threshold of the liquid CO2 storage tank.

[0121] It is understandable that as the current liquid level value inside the liquid CO2 storage tank increases, the safety pressure margin will increase accordingly, so the current exhaust pressure threshold of the liquid CO2 storage tank will decrease accordingly. In other words, the higher the current liquid level value inside the liquid CO2 storage tank, the smaller the current exhaust pressure threshold of the liquid CO2 storage tank will be, thereby preventing the pressure value inside the liquid CO2 storage tank from reaching the maximum pressure value due to the pressure change rate of the gas CO2 in the liquid CO2 storage tank being too fast.

[0122] S304: When the current pressure value is equal to or greater than the current exhaust pressure threshold, the exhaust valve is controlled to open to exhaust the liquid CO2 storage tank through the exhaust device.

[0123] It can be understood that when the current pressure value inside the liquid CO2 storage tank is equal to or greater than the current exhaust pressure threshold in the liquid CO2 storage tank, it means that the gas pressure of the gas CO2 in the liquid CO2 storage tank is about to approach the maximum bearing pressure in the liquid CO2 storage tank. At this time, by venting the liquid CO2 storage tank, it can be ensured that the pressure value inside the liquid CO2 storage tank is always less than the maximum bearing pressure value in the liquid CO2 storage tank, thereby reducing the risk of the liquid CO2 storage tank being damaged by overpressure.

[0124] It should be noted that the beneficial effects of the exhaust venting control method provided in the embodiment of the present application can be referred to the relevant description in the above-mentioned system embodiment, and will not be repeated here.

[0125] See also Figure 5 , is a schematic flow chart of a method for controlling exhaust and venting of a liquid CO2 storage tank provided in another embodiment of the present application, such as Figure 5 As shown, in this embodiment, the exhaust gas discharge control method may further include S305 to S307, which are described in detail as follows:

[0126] S305, obtaining the exhaust temperature value and the exhaust pressure value inside the liquid CO2 storage tank during the exhaust process.

[0127] In the process of exhausting the liquid CO2 storage tank, in order to determine the timing of stopping exhausting the liquid CO2 storage tank, the exhaust and venting control device 11 can obtain the exhaust temperature value inside the liquid CO2 storage tank during the exhaust process from the temperature sensor 13 installed inside the liquid CO2 storage tank. Exemplarily, the exhaust and venting control device 11 can determine the average value of multiple temperature values ​​obtained from multiple temperature sensors 13 during the exhaust process as the exhaust temperature value inside the liquid CO2 storage tank during the exhaust process. Exemplarily, during the exhaust process, the exhaust and venting control device 11 can obtain the exhaust temperature value inside the liquid CO2 storage tank during the exhaust process every second time period.

[0128] The exhaust and venting control device 11 can obtain the exhaust pressure value inside the liquid CO2 storage tank during the exhaust process from the pressure sensor 14 installed inside the liquid CO2 storage tank. Exemplarily, during the exhaust process, the exhaust and venting control device 11 can obtain the exhaust pressure value inside the liquid CO2 storage tank during the exhaust process from the pressure sensor 14 every second time period.

[0129] Among them, the second duration can be set according to actual needs and is not particularly limited here.

[0130] It is understandable that as the gas CO2 in the liquid CO2 storage tank gradually decreases during the exhaust process, the exhaust pressure value inside the liquid CO2 storage tank will also gradually decrease.

[0131] S306, determining the saturated vapor pressure value of CO2 corresponding to the exhaust temperature value.

[0132] The saturated vapor pressure value of CO2 corresponding to the exhaust temperature value is used to describe the pressure value of gaseous CO2 when liquid CO2 and gaseous CO2 reach a dynamic equilibrium state at the corresponding exhaust temperature, that is, the maximum vapor pressure value that liquid CO2 can produce at the corresponding exhaust temperature.

[0133] It should be noted that the saturated vapor pressure of CO2 at different exhaust temperatures is different.

[0134] Exemplarily, the exhaust gas discharge control device 11 can determine the saturated vapor pressure value of CO2 corresponding to the exhaust gas temperature value by looking up a table. For example, the exhaust gas discharge control device 11 can determine the saturated vapor pressure value of CO2 corresponding to the exhaust gas temperature value by looking up a corresponding relationship table between the temperature value and the saturated vapor pressure value of CO2.

[0135] S307, when the exhaust pressure value is equal to or less than the saturated vapor pressure value, the exhaust valve is controlled to close to stop exhausting the liquid CO2 storage tank.

[0136] It can be understood that, at the saturated vapor pressure of CO2 corresponding to the exhaust temperature value, the liquid CO2 and gaseous CO2 in the liquid CO2 storage tank are in a state of equilibrium. When the exhaust pressure value inside the liquid CO2 storage tank drops to less than the saturated vapor pressure value, the evaporation rate of the liquid CO2 inside the liquid CO2 storage tank will become faster. Therefore, in order to reduce the loss of liquid CO2 caused by the rapid evaporation of liquid CO2, the exhaust venting control device 11 can control the exhaust valve to close when the exhaust pressure value during the exhaust process is equal to or less than the saturated vapor pressure value, so as to stop exhausting the liquid CO2 storage tank.

[0137] It can be seen from the above that the exhaust and venting control method provided in this embodiment can not only realize the automatic exhaust control of the liquid CO2 storage tank, but also reduce the loss of liquid CO2 caused by the rapid evaporation of liquid CO2.

[0138] It is understandable that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0139] Based on the exhaust and venting control method of the liquid CO2 storage tank provided in the above embodiment, the present application further provides an embodiment of the exhaust and venting control device for implementing the above method embodiment. Figure 6 , is a schematic diagram of the structure of an exhaust gas venting control device provided in an embodiment of the present application. For ease of description, only the parts related to this embodiment are shown. Figure 6 As shown, the exhaust venting control device may include: an acquisition unit 61 , a first determination unit 62 , a second determination unit 63 and an exhaust valve control unit 64 .

[0140] The acquisition unit 61 is used to acquire the current pressure value and the current liquid level value inside the liquid CO2 storage tank.

[0141] The first determining unit 62 is used to determine the safety pressure margin of the liquid CO2 storage tank corresponding to the current liquid level value.

[0142] The second determining unit 63 is used to determine a current exhaust pressure threshold of the liquid CO2 storage tank according to the maximum pressure value of the liquid CO2 storage tank and the safety pressure margin.

[0143] The exhaust valve control unit 64 is used to control the exhaust valve to open when the current pressure value is equal to or greater than the current exhaust pressure threshold, so as to exhaust the liquid CO2 storage tank through the exhaust device.

[0144] Optionally, the first determination unit 62 includes a correction coefficient determination unit and a pressure margin determination unit.

[0145] The correction coefficient determination unit is used to determine the correction coefficient of the pressure margin according to the current liquid level value.

[0146] The pressure margin determination unit is used to determine the product of a preset basic pressure margin and the correction coefficient as the safety pressure margin.

[0147] Optionally, the correction coefficient determination unit is specifically used to determine the correction coefficient of the pressure margin according to the following formula:

[0148]

[0149] Wherein, k is the correction coefficient of the pressure margin, L dq is the current liquid level value, L zd is the minimum safe liquid level value of the liquid CO2 storage tank, L zg It is the maximum safe liquid level value of the liquid CO2 storage tank.

[0150] Optionally, the second determination unit 63 is specifically configured to determine a difference between the maximum pressure bearing value and the safety pressure margin as the current exhaust pressure threshold.

[0151] Optionally, the exhaust gas release control device 11 may further include a third determination unit.

[0152] The acquisition unit 11 is also used to acquire the exhaust temperature value and the exhaust pressure value inside the liquid CO2 storage tank during the exhaust process.

[0153] The third determining unit is used to determine the saturated vapor pressure value of CO2 corresponding to the exhaust temperature value.

[0154] The exhaust valve control unit 64 is further configured to control the exhaust valve to close when the exhaust pressure value is equal to or less than the saturated vapor pressure value, so as to stop exhausting the liquid CO2 storage tank.

[0155] It should be noted that the information interaction, execution process and other contents between the above-mentioned units are based on the same concept as the method embodiment of the present application. Their specific functions and technical effects can be specifically referred to the method embodiment part and will not be repeated here.

[0156] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units is used as an example for illustration. In actual applications, the above-mentioned functions can be assigned to different functional units as needed, that is, the internal structure of the control device can be divided into different functional units to complete all or part of the functions described above. The functional units in the embodiment can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of each unit in the above-mentioned control device can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0157] See also Figure 7 , Figure 7 This is a schematic diagram of the structure of an exhaust gas venting control device provided in another embodiment of the present application. Figure 7 As shown, the exhaust and venting control device 11 provided in this embodiment may include: a processor 110, a memory 111, and a computer program 112 stored in the memory 111 and executable on the processor 110, such as a program corresponding to the exhaust and venting control method for a liquid CO2 storage tank. When the processor 110 executes the computer program 112, each step in the above-mentioned exhaust and venting control method for a liquid CO2 storage tank is implemented, such as Figure 3 Alternatively, when the processor 110 executes the computer program 112, the functions of each module / unit in the above-mentioned exhaust gas venting control device embodiment are realized, for example Figure 6 The functions of the units 61 to 64 are shown.

[0158] Exemplarily, the computer program 112 may be divided into one or more modules / units, one or more modules / units are stored in the memory 111, and are executed by the processor 110 to complete the present application. One or more modules / units may be a series of computer program instruction segments that can complete specific functions, and the instruction segments are used to describe the execution process of the computer program 112 in the exhaust gas discharge control device 11. For example, the computer program 112 may be divided into an acquisition unit, a first determination unit, a second determination unit, and an exhaust valve control unit. For the specific functions of each unit, please refer to Figure 7The relevant descriptions in the corresponding embodiments are not repeated here.

[0159] Those skilled in the art will understand that Figure 7 The exhaust gas discharge control device 11 is merely an example and does not constitute a limitation on the exhaust gas discharge control device 11 , and may include more or fewer components than shown in the figure, or a combination of certain components, or different components.

[0160] The processor 110 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0161] The memory 111 may be an internal storage unit of the exhaust and venting control device 11, such as a hard disk or memory of the exhaust and venting control device 11. The memory 111 may also be an external storage device of the exhaust and venting control device 11, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card or a flash card (flash card) equipped on the exhaust and venting control device 11. Further, the memory 111 may also include both an internal storage unit and an external storage device of the exhaust and venting control device 11. The memory 111 is used to store computer programs and other programs and data required by the method. The memory 111 may also be used to temporarily store data that has been output or is to be output.

[0162] An embodiment of the present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, each step in the exhaust gas venting control system described in the above method embodiment is implemented.

[0163] An embodiment of the present application provides a computer program product. When the computer program product runs on a control device, the control device implements the steps in the above-mentioned method embodiments.

[0164] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0165] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0166] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A gas exhaust and venting control system for a liquid carbon dioxide storage tank, characterized in that: include: Exhaust venting control device, exhaust valve, pressure sensor, liquid level gauge and exhaust device; The pressure sensor is used to collect the pressure value inside the liquid CO2 storage tank; The liquid level meter is used to collect the liquid level value inside the liquid CO2 storage tank; The exhaust valve is used to control the opening and closing of the exhaust port of the liquid CO2 storage tank; The exhaust port is communicated with the air inlet of the exhaust device, and the air inlet and the air outlet of the exhaust device are communicated through a low-noise exhaust duct; the low-noise exhaust duct comprises a honeycomb duct and a labyrinth duct sequentially arranged between the air inlet and the air outlet; a plurality of evenly distributed small holes are opened on the pipe wall of the honeycomb duct; the labyrinth duct comprises a multi-stage baffle section; The exhaust and venting control device is in communication connection with the pressure sensor, the liquid level meter and the exhaust valve, and is used to obtain the current pressure value and the current liquid level value inside the liquid CO2 storage tank; Determine the safety pressure margin of the liquid CO2 storage tank corresponding to the current liquid level value; determine the current exhaust pressure threshold of the liquid CO2 storage tank according to the maximum pressure value of the liquid CO2 storage tank and the safety pressure margin; and when the current pressure value is equal to or greater than the current exhaust pressure threshold, control the exhaust valve to open, so as to exhaust the liquid CO2 storage tank through the exhaust device.

2. The exhaust gas venting control system according to claim 1, characterized in that: The exhaust and venting control device is specifically used to: determine a correction coefficient of the pressure margin according to the current liquid level value; and determine the product of a preset basic pressure margin and the correction coefficient as the safety pressure margin.

3. The exhaust gas venting control system according to claim 2, characterized in that: The exhaust venting control device is also specifically used to determine the correction coefficient of the pressure margin according to the following formula: Wherein, k is the correction coefficient of the pressure margin, L dq is the current liquid level value, L zd is the minimum safe liquid level value of the liquid CO2 storage tank, L zg It is the maximum safe liquid level value of the liquid CO2 storage tank.

4. The exhaust gas venting control system according to claim 1, characterized in that: The exhaust venting control device is specifically used to determine the difference between the maximum pressure value and the safety pressure margin as the current exhaust pressure threshold.

5. The exhaust gas venting control system according to claim 1, characterized in that: The exhaust venting control system also includes a temperature sensor; The temperature sensor is used to collect the temperature value inside the liquid CO2 storage tank; The exhaust and venting control device is also specifically used to: obtain the exhaust temperature value and exhaust pressure value inside the liquid CO2 storage tank during the exhaust process; determine the saturated vapor pressure value of CO2 corresponding to the exhaust temperature value; and when the exhaust pressure value is equal to or less than the saturated vapor pressure value, control the exhaust valve to close to stop venting the liquid CO2 storage tank.

6. The exhaust gas venting control system according to any one of claims 1 to 5, characterized in that: The length of the honeycomb pipe is determined by the following formula: Among them, L h is the length of the honeycomb pipe, K h is the preset length adjustment coefficient, D1 is the diameter of the honeycomb pipe, ΔP1 is the preset pressure drop of the honeycomb pipe, and P max is the maximum pressure value of the liquid CO2 storage tank.

7. The exhaust gas venting control system according to claim 6, characterized in that: The diameter of the small holes on the wall of the honeycomb pipe is determined by the following formula: Wherein, d is the diameter of the small hole on the wall of the honeycomb pipe, C d is the aperture correction factor; The number of small holes on the wall of the honeycomb pipe is determined by the following formula: Wherein, N is the number of small holes on the wall of the honeycomb pipe, and ceil() is a rounding up function.

8. The exhaust gas venting control system according to any one of claims 1 to 5, characterized in that: The length of each baffle section included in the labyrinth pipeline can be determined by the following formula: Among them, L m is the length of each baffle section, K m is the baffle efficiency coefficient of the labyrinth pipeline, D2 is the diameter of the labyrinth pipeline, ΔP2 is the preset pressure drop of the labyrinth pipeline, P max is the maximum pressure-bearing value of the liquid CO2 storage tank, and ΔP1 is the preset pressure drop of the honeycomb pipeline.

9. A method for controlling the exhaust and venting of a liquid carbon dioxide storage tank, characterized in that: An exhaust gas venting control device used in an exhaust gas venting control system as claimed in any one of claims 1 to 8; The exhaust venting control method comprises: Get the current pressure value and current liquid level value inside the liquid CO2 storage tank; Determine the safety pressure margin of the liquid CO2 storage tank corresponding to the current liquid level value; Determining a current exhaust pressure threshold of the liquid CO2 storage tank according to the maximum pressure bearing value of the liquid CO2 storage tank and the safety pressure margin; When the current pressure value is equal to or greater than the current exhaust pressure threshold, the exhaust valve is controlled to open, so as to exhaust the liquid CO2 storage tank through the exhaust device.

10. A gas exhaust control device for a liquid carbon dioxide storage tank, characterized in that: The method comprises a memory and a computer program stored in the memory and executable on a processor, wherein the processor implements the exhaust gas venting control method as claimed in claim 9 when executing the computer program.

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