Multifunctional cryogenic storage tank

Abstract

The present invention discloses a multifunctional cryogenic storage tank, which relates to the technical field of cryogenic liquid transportation and gasification. The multifunctional cryogenic storage tank comprises a tank body, a gasification module, a boosting module, a pressure reducing module and a controller. The boosting module is arranged between the tank body and the gasification module. The gasification module comprises a liquid inlet end and a gas outlet end. The liquid inlet end of the gasification module is connected to the tank body. The pressure reducing module is arranged between the liquid inlet end of the gasification module and the tank body. The gasification module, the boosting module and the pressure reducing module are connected by a pipeline. Through the arrangement of the gasification module, the cryogenic storage tank can not only realize the function of storing and transporting cryogenic liquids, but also can directly realize the gasification of a small part of the cryogenic liquid. When the factory needs a small cubic meter of industrial gas, the multifunctional cryogenic liquid storage tank can provide the factory with a certain amount of industrial gas. At the same time, no installation and debugging are required. The highly integrated multifunctional cryogenic liquid storage tank occupies a small area.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic liquid transportation and gasification, and in particular to a multifunctional cryogenic storage tank and a control process thereof. Background Art

[0002] In the current factory operation process, some processes require the use of gasified industrial gases to assist the normal progress of the production process. Both cryogenic natural gas and cryogenic nitrogen are commonly used industrial gases.

[0003] Some factories do not use a large amount of this type of gas, but due to the inevitable demand, they have to divide the factory into areas to install low-temperature liquid storage tanks, vaporizers and corresponding pipelines, and they also need to rebuild the foundation and carry out installation and debugging work.

[0004] For these factories, the above costs are difficult to accept because industrial gases are not used frequently.

[0005] Existing booster tanks, such as Chinese invention patent CN102954345B, reveal the piping design of the storage tank and the boosting part. This type of transport tank can increase the boosting speed, but in actual operation, the tank is transported to the client. The client needs to arrange the vaporizer according to the height of the tank and the position of the liquid outlet. It is necessary to build a new foundation, install and debug the vaporizer, and then connect the liquid storage tank to the vaporizer to realize liquid vaporization. For a little industrial gas, the customer needs to pay a large time cost. For customers who are in urgent need of gas, this method obviously cannot meet customer needs. Summary of the Invention

[0006] In order to realize the transportation and gasification functions of small amounts of cryogenic liquefied gas, the technical solution of the present invention provides a multifunctional cryogenic storage tank. The technical solution is as follows:

[0007] A multifunctional low-temperature storage tank includes a tank body, a gasification module, a boosting module, a pressure reducing module and a controller. The boosting module is arranged between the tank body and the gasification module. The gasification module includes a liquid inlet end and a gas outlet end. The liquid inlet end of the gasification module is connected to the tank body. The pressure reducing module is arranged between the liquid inlet end of the gasification module and the tank body. The gasification module, the boosting module and the pressure reducing module are connected by a pipeline. A flow valve is provided on the pipeline. The controller controls the operation of the flow valve.

[0008] The setting of the boosting module enables the tank to achieve pressurized storage. The setting of the decompression module enables the rapid flow and gasification of the liquid, ensuring the gasification efficiency while increasing the gas-liquid flow rate. The setting of the gasification module enables the low-temperature storage tank to not only store and transport low-temperature liquids, but also directly gasify a small portion of the low-temperature liquid. When the factory needs a small cubic meter of industrial gas, the multifunctional low-temperature liquid storage tank can provide the factory with a certain amount of industrial gas. At the same time, there is no need for installation and debugging. The highly integrated multifunctional low-temperature liquid storage tank occupies a small area.

[0009] In particular, the gasification module is combined with the pressurization module and the decompression module to form a pressurization gasification device and a decompression gasification device, and the pressurization gasification device and the decompression gasification device are connected to the tank body.

[0010] The gas in the tank is pressurized and pumped back into the tank body through pressurized gasification, which increases the pressure of the low-temperature storage tank, and the low-temperature liquid is gasified through the pressure-reducing gasification device.

[0011] In particular, the pressure-reducing gasification device includes a first gasifier and a second gasifier, the liquid inlet ends of the first gasifier and the second gasifier are connected to the tank body through a pressure-reducing regulating valve, and the pressure-reducing regulating valve is electrically connected to the controller.

[0012] Through the setting of double vaporizers, the low-temperature liquid can be vaporized separately through the vaporizers on both sides, doubling the area of the supercooling section and greatly improving the vaporization efficiency.

[0013] Particularly, the subcooling sections of the first vaporizer and the second vaporizer use six-fin heat exchange tubes or eight-fin heat exchange tubes, and the gasification sections of the first vaporizer and the second vaporizer use twelve-fin heat exchange tubes.

[0014] By using low-fin-count heat exchange tubes in the supercooling section, excessive condensation and icing in the supercooling section is avoided, thereby ensuring the heat exchange efficiency of the supercooling section. By using high-fin-count heat exchange tubes in the gasification section, the contact area between the heat exchange tubes and the air is increased, thereby greatly improving the heat exchange efficiency.

[0015] In particular, the liquid inlet end of the tank body is provided with an upper liquid inlet valve and a lower liquid inlet valve. The controller controls the lower liquid inlet valve to pour cryogenic liquid into the bottom of the tank body, and the controller controls the upper liquid inlet valve to pour cryogenic liquid into the top of the tank body.

[0016] By setting the upper liquid inlet valve and the lower liquid inlet valve, the liquid inlet of the tank can be divided into the bottom liquid inlet and upper liquid replenishment processes. When the liquid level is low, the two liquid inlet valves can be opened to add liquid at the same time. When the liquid level is high, the pressure of the lower liquid inlet valve is greater. At this time, the upper liquid inlet valve can be opened to realize the liquid filling operation, ensuring the speed and stability of the liquid filling.

[0017] In particular, the pressurized gasification device includes a third gasifier, the air inlet end of the third gasifier is connected to the top of the tank body, the air outlet end of the third gasifier is connected to the upper liquid inlet valve through a boost regulating valve, and the third gasifier adopts six-fin heat exchange tubes or eight-fin heat exchange tubes.

[0018] In particular, the pressurized gasification device includes a third gasifier, the air inlet end of the third gasifier is connected to the top of the tank body, the air outlet end of the third gasifier is connected to the bottom of the tank body through a boost regulating valve, a flame arrester is also provided between the boost regulating valve and the bottom of the tank body, and the boost regulating valve is electrically connected to the controller.

[0019] Particularly, the gas outlet end of the first gasifier is connected to the gas outlet end of the second gasifier and forms a gas outlet. A gas outlet valve is provided between the gas outlet end of the first gasifier and the gas outlet end of the second gasifier and the gas outlet. The gas outlet valve is electrically connected to the controller.

[0020] By setting the outlet valve, the gas output from the outlet can be increased or decreased according to demand, meeting the customer's needs for gas of various flow rates.

[0021] In particular, an exhaust valve is provided between the exhaust valve and the exhaust port of the second gasifier, and the exhaust valve is electrically connected to the controller.

[0022] By setting the drain valve, the remaining gas in the pipeline that cannot be discharged can be discharged from the pipeline under the action of the drain valve, thereby achieving the emptying of the pipeline.

[0023] In particular, the pressurized gasification device and the depressurized gasification device are both arranged in a circle outside the tank body, and the heat exchange pipes of the pressurized gasification device and the depressurized gasification device are distributed at equal intervals on the outer side of the tank body.

[0024] By arranging heat exchange tubes at equal intervals outside the tank body, the heat exchange efficiency of the heat exchanger is not lost while the floor space of the heat exchanger is saved.

[0025] Specifically, an emergency shut-off valve is provided between the pressure-reducing regulating valve and the first gasifier and the second gasifier.

[0026] The emergency shut-off valve can cut off the liquid supply channel in time when gasification encounters special circumstances to ensure the safety of gasification.

[0027] A liquid level gauge is also provided at the bottom of the tank body, and the liquid level gauge includes a liquid phase valve, a balance valve and a gas phase valve.

[0028] By setting up the liquid level gauge, the liquid level height in the tank can be clearly known, so that the remaining amount in the tank can be digitized.

[0029] In particular, an overflow device is further provided on the top of the tank body. The overflow device includes an overflow valve and an emptying valve. The emptying valve is connected to the overflow valve, and the overflow valve is connected to the top of the tank body.

[0030] By setting up the overflow device, the liquid level can be guaranteed not to be higher than the limit value when the liquid level is high, thus ensuring the safety of the tank.

[0031] Furthermore, drain valves are provided on both sides of the emergency shut-off valve.

[0032] By setting the drain valve, the pipes around the emergency shut-off valve can also be drained through the drain valve in an emergency, ensuring the safety of the device.

[0033] Preferably, a liquid use valve and a liquid outlet valve are further provided between the tank body and the gasification module, the liquid outlet valve is connected to the liquid outlet, and the liquid use valve is connected to the gasification module.

[0034] Through the liquid outlet valve, we can meet the needs of customers for low-temperature liquids and meet the requirements of various customers.

[0035] Specifically, a one-way valve is provided between the lower liquid inlet valve and the tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the invention, in which:

[0037] Figure 1 1 is a schematic structural diagram of a multifunctional cryogenic storage tank according to an embodiment of the present invention;

[0038] Figure 2 yes Figure 1 A top view of

[0039] Figure 3 yes Figure 2 Structural diagram of the middle right part;

[0040] Figure 4 1 is a control flow chart of a multifunctional cryogenic storage tank shown in an embodiment of the present invention.

[0041] Reference numerals: 1 first vaporizer, 2 second vaporizer, 3 third vaporizer, 4 pressure-reducing regulating valve, 5 tank body, 6 upper liquid inlet valve, 7 lower liquid inlet valve, 8 pressure-increasing regulating valve, 9 flame arrester, 10 gas outlet, 11 gas outlet valve, 12 drain valve, 13 one-way valve, 14 emergency shut-off valve, 15 liquid level gauge, 16 overflow device, 17 liquid service valve, 18 liquid outlet valve. DETAILED DESCRIPTION

[0042] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0043] In the current factory operation process, some processes require the use of gasified industrial gases to assist the normal progress of the production process. Both cryogenic natural gas and cryogenic nitrogen are commonly used industrial gases.

[0044] Some factories do not use a large amount of this type of gas, but due to the inevitable demand, they have to divide the factory into areas to install low-temperature liquid storage tanks, vaporizers and corresponding pipelines, and they also need to rebuild the foundation and carry out installation and debugging work.

[0045] For these factories, the above costs are difficult to accept because industrial gases are not used frequently.

[0046] In order to realize the transportation and gasification functions of a small amount of cryogenic liquefied gas, the technical solution of the present invention provides a multifunctional cryogenic storage tank, and the technical solution is as follows:

[0047] The following is based on Figures 1 to 4 The present invention is described in further detail.

[0048] A multifunctional low-temperature storage tank includes a tank body, a gasification module, a boosting module, a pressure reducing module and a controller. The boosting module is arranged between the tank body and the gasification module. The gasification module includes a liquid inlet end and a gas outlet end. The liquid inlet end of the gasification module is connected to the tank body. The pressure reducing module is arranged between the liquid inlet end of the gasification module and the tank body. The gasification module, the boosting module and the pressure reducing module are connected by a pipeline. A flow valve is provided on the pipeline. The controller controls the operation of the flow valve.

[0049] The booster module allows the tank 5 to store cryogenic liquids at high pressure. The decompression module allows for rapid liquid flow and vaporization, ensuring vaporization efficiency while increasing the gas-liquid flow rate. The vaporization module allows the cryogenic storage tank to not only store and transport cryogenic liquids but also directly vaporize small amounts of them. When a factory needs small cubic meters of industrial gas, the multifunctional cryogenic liquid storage tank can provide a certain amount of industrial gas without requiring installation or commissioning. The highly integrated multifunctional cryogenic liquid storage tank occupies a small footprint.

[0050] In actual use, the gasification module is combined with the pressurization module and the pressure reduction module to form a pressurized gasification device and a pressure reduction gasification device, which are connected to the tank body 5. The gas in the tank is pressurized by the pressurized gasification and then pumped back into the tank body 5, and the cryogenic liquid is vaporized by the pressure reduction gasification device.

[0051] To improve gasification efficiency, in actual operation, the pressure-reducing gasification device includes a first gasifier 1 and a second gasifier 2. The liquid inlet ends of the first gasifier 1 and the second gasifier 2 are connected to the tank 5 via a pressure-reducing regulating valve 4, which is electrically connected to the controller. The dual gasifier configuration allows cryogenic liquid to be gasified separately through the gasifiers on both sides, doubling the area of the subcooling section and significantly improving gasification efficiency.

[0052] Specifically, the subcooling sections of the first and second vaporizers 1 and 2 utilize six-fin or eight-fin heat exchange tubes, while the vaporization sections of the first and second vaporizers 1 and 2 utilize twelve-fin heat exchange tubes. The use of low-fin-count heat exchange tubes in the subcooling section prevents excessive condensation and icing in the subcooling section, thereby ensuring heat exchange efficiency in the subcooling section. The use of high-fin-count heat exchange tubes in the vaporization section increases the contact area between the heat exchange tubes and the air, significantly improving heat exchange efficiency.

[0053] Of course, to fill the tank 5 more quickly, an upper inlet valve 6 and a lower inlet valve 7 are provided at the liquid inlet end of the tank 5. A controller controls the lower inlet valve 7 to inject cryogenic liquid into the bottom of the tank 5, while a controller controls the upper inlet valve 6 to inject cryogenic liquid into the top of the tank 5. A one-way valve 13 is also provided between the lower inlet valve and the tank. The arrangement of the upper inlet valve 6 and the lower inlet valve 7 allows the inlet of liquid into the tank 5 to be divided into a bottom-filling process and a top-filling process. When the liquid level is low, both inlet valves can be opened to allow simultaneous inlet flow. When the liquid level is high, the pressure from the lower inlet valve 7 is high, and the upper inlet valve 6 can be opened to allow the inlet flow, thus ensuring the speed and stability of the inlet flow.

[0054] In one operating mode, the pressurized gasification device includes a third gasifier 3, the air inlet end of the third gasifier 3 is connected to the top of the tank body 5, and the air outlet end of the third gasifier 3 is connected to the upper liquid inlet valve 6 through the boost regulating valve 8. The third gasifier 3 adopts six-fin heat exchange tubes or eight-fin heat exchange tubes.

[0055] In another operating mode, the pressurized gasification device includes a third gasifier 3, the air inlet end of the third gasifier 3 is connected to the top of the tank body 5, and the air outlet end of the third gasifier 3 is connected to the bottom of the tank body 5 through a boost regulating valve 8. A flame arrester 9 is also provided between the boost regulating valve 8 and the bottom of the tank body 5, and the boost regulating valve 8 is electrically connected to the controller.

[0056] To discharge the vaporized gas from the system, the outlets of the first and second vaporizers 1 and 2 are connected to form an outlet 10. An outlet valve 11 is installed between the outlets of the first and second vaporizers 1 and 2, and outlet 10. This valve is electrically connected to a controller. The provision of outlet valve 11 allows the gas output from outlet 10 to be increased or decreased as needed, meeting various gas flow requirements.

[0057] In particular, an exhaust valve 12 is provided between the gas outlet valve 11 and the gas outlet 10 of the second gasifier 2 , and the exhaust valve 12 is electrically connected to the controller.

[0058] By setting the drain valve 12, the remaining gas in the pipeline that cannot be discharged can be discharged from the pipeline under the action of the drain valve 12, thereby achieving the emptying of the pipeline.

[0059] In particular, the pressurized gasification device and the depressurized gasification device are both arranged in a ring outside the tank body 5, and the heat exchange pipes of the pressurized gasification device 20 and the depressurized gasification device are distributed on the outer side of the tank body 5 at equal intervals.

[0060] By arranging heat exchange tubes at equal intervals outside the tank body 5, the heat exchange efficiency of the heat exchanger is not reduced while the floor space of the heat exchanger is saved.

[0061] Of course, for safety reasons, a gas probe and an audible and visual alarm device are also provided on the low-temperature tank body 5. The gas probe is connected to the audible and visual alarm device and is communicated with the controller. When a natural gas leak is detected, corresponding emergency stop measures can be taken in time to ensure the safety of gasification.

[0062] To enable the aforementioned emergency stop measures, an emergency shut-off valve 14 is installed between the step-down regulating valve and the first and second vaporizers. This valve can promptly shut off the liquid supply channel in the event of a critical gasification situation, ensuring gasification safety. Drain valves are also located on either side of the emergency shut-off valve 14. These drain valves allow the pipelines surrounding the emergency shut-off valve 14 to be emptied in an emergency, ensuring the safety of the system.

[0063] In order to clearly know whether the liquid level has dropped to a point where it cannot be used, a liquid level gauge 15 is installed at the bottom of the tank. The liquid level gauge 15 includes a liquid phase valve, a balance valve, and a gas phase valve. The liquid level gauge 15 can clearly know the liquid level in the tank, so that the remaining amount in the tank can be digitized.

[0064] In addition to preventing the liquid level from being too low, it is also necessary to prevent the liquid level from being too high. Therefore, an overflow device 16 is provided on the top of the tank body. The overflow device 16 includes an overflow valve and a drain valve. The drain valve is connected to the overflow valve, and the overflow valve is connected to the top of the tank body. The setting of the overflow device 16 can ensure that the liquid level does not exceed the limit value when the liquid level is high, thereby ensuring the safety of the tank body.

[0065] Most customers require direct vaporization of industrial gases, but some already have vaporizers and require direct vaporization of cryogenic liquids. Therefore, a liquid service valve 17 and a liquid outlet valve 18 are installed between the tank and the vaporization module. The liquid outlet valve 18 connects to the liquid outlet, while the liquid service valve 17 connects to the vaporization module. The liquid outlet valve 18 satisfies customers' cryogenic liquid needs, meeting a variety of customer requirements.

[0066] Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meanings understood by persons of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in the patent specification and claims of this invention do not denote any order, quantity, or importance, but are merely used to distinguish different components. Similarly, terms such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0067] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the claims.

[0068] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. Multifunctional cryogenic storage tank, characterized in that: The invention comprises a tank body (5), a gasification device, a pressure-increasing device, a pressure-reducing device and a controller, wherein the pressure-increasing device is arranged between the tank body (5) and the gasification device, the gasification device comprises a liquid inlet end and a gas outlet end, the liquid inlet end of the gasification device is connected to the tank body (5), the pressure-reducing device is arranged between the liquid inlet end of the gasification device and the tank body (5), the gasification device, the pressure-increasing device and the pressure-reducing device are connected by a pipeline, a flow valve is provided on the pipeline, and the controller controls the operation of the flow valve; A portion of the gasification device and the supercharging device form a supercharging gasification device, and the supercharging gasification device is connected to the tank body (5); the other portion of the gasification device includes a first gasifier (1) and a second gasifier (2), the liquid inlet ends of the first gasifier (1) and the second gasifier (2) are connected to the tank body (5) through a pressure-reducing regulating valve (4), and the pressure-reducing regulating valve (4) is electrically connected to the controller; the supercooling sections of the first gasifier (1) and the second gasifier (2) use six-fin heat exchange tubes or eight-fin heat exchange tubes, and the gasification sections of the first gasifier (1) and the second gasifier (2) use twelve-fin heat exchange tubes; The liquid inlet end of the tank body (5) is provided with an upper liquid inlet valve (6) and a lower liquid inlet valve (7). The controller controls the lower liquid inlet valve (7) to inject low-temperature liquid into the bottom of the tank body (5), and the controller controls the upper liquid inlet valve (6) to inject low-temperature liquid into the top of the tank body (5). A one-way valve (13) is further provided between the lower liquid inlet valve and the tank body. The pressurized gasification device includes a third gasifier (3). The gas inlet end of the third gasifier (3) is connected to the top of the tank body (5), and the gas outlet end of the third gasifier (3) is connected to the top of the tank body (5). A boost regulating valve (8) is connected to the bottom of the tank body (5), a flame arrester (9) is further provided between the boost regulating valve (8) and the bottom of the tank body (5), the boost regulating valve (8) is electrically connected to the controller, the boost gasification device comprises a third gasifier (3), an air inlet end of the third gasifier (3) is connected to the top end of the tank body (5), an air outlet end of the third gasifier (3) is connected to the upper liquid inlet valve (6) via the boost regulating valve (8), and the third gasifier (3) adopts a six-fin heat exchange tube or an eight-fin heat exchange tube; The gas outlet end of the first gasifier (1) is connected to the gas outlet end of the second gasifier (2) and forms a gas outlet (10); a gas outlet valve (11) is provided between the gas outlet end of the first gasifier (1) and the gas outlet end of the second gasifier (2) and the gas outlet (10); the gas outlet valve (11) is electrically connected to the controller; an exhaust valve (12) is provided between the gas outlet valve (11) of the second gasifier (2) and the gas outlet (10); the exhaust valve (12) is electrically connected to the controller; The pressurized gasification device and the gasification device are both arranged in a ring outside the tank body (5), and the heat exchange pipes of the pressurized gasification device and the gasification device are distributed at equal intervals on the outer side of the tank body (5). An emergency shut-off valve (14) is also provided between the pressure-reducing regulating valve and the first gasifier and the second gasifier, and drain valves are provided on both sides of the emergency shut-off valve (14); The top of the tank body is also provided with an overflow device (16), which comprises an overflow valve and a drain valve, wherein the drain valve is connected to the overflow valve, and the overflow valve is connected to the top of the tank body.

2. The multifunctional cryogenic storage tank according to claim 1, characterized in that: A liquid level meter (15) is also provided at the bottom of the tank body. The liquid level meter (15) comprises a liquid phase valve, a balance valve and a gas phase valve.

3. The multifunctional cryogenic storage tank according to claim 1, characterized in that: A liquid use valve (17) and a liquid outlet valve (18) are further provided between the tank body and the gasification device. The liquid outlet valve (18) is connected to the liquid outlet, and the liquid use valve (17) is connected to the gasification device.

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