Automatic pressure supplementing device for closed container

Abstract

The utility model provides an automatic pressure supplementing device for a closed container. The automatic pressure supplementing device is applied to the closed container. The closed container comprises a shell, a liquid inlet, an exhaust port and a heating assembly, and the liquid inlet and the exhaust port are both formed in the shell; the heating assembly is arranged in the shell, a liquid phase enters the shell through the liquid inlet, the heating assembly releases heat to the liquid phase, and the liquid phase is discharged out of the shell through the exhaust port after being changed into a gas phase; the shell is further provided with a pressure supplementing opening, and the automatic pressure supplementing device is connected with the shell through the pressure supplementing opening and used for supplementing pressure to the shell. When the pressure in the shell is smaller than the starting pressure of the valve assembly, the valve assembly is automatically opened, the pressure source supplements the pressure into the shell, and the vacuum condition in the shell is avoided, so that the vacuum design requirement of the shell can be reduced, the equipment investment cost can be reduced, and on the other hand, the interior of the shell can be always in a positive pressure state; air cannot permeate into the hydrogen production system, so that the safety of the system can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of sealed container technology, and in particular to an automatic pressure replenishment device for sealed containers. Background Technology

[0002] A closed container is generally a container that is not directly connected to the outside world. It maintains the isolation between the internal and external environments, preventing the exchange of substances, especially the entry or exit of gases or liquids. In chemical reactions, the main difference between closed and open containers lies in whether there is a possibility of gas exchange with the outside environment. In most cases, the volume of a closed container is fixed, meaning it cannot freely expand or shrink to accommodate changes in internal pressure unless there is a significant change in external pressure.

[0003] For shell-side liquid-gas mixing and tube-side gas-gas heat exchange closed-loop vessels, after shutdown, the shell-side temperature continues to drop, causing vapor condensation. The previously pressurized shell-side space will experience a pressure drop due to vapor condensation, potentially creating a shell-side vacuum. Therefore, the vessel requires a vacuum design, which increases the design requirements and costs of the closed-loop vessel. Furthermore, for systems where vapor participates in the reaction (such as methane steam reforming), a vacuum in the shell-side vessel poses a risk of air leakage, allowing oxygen to enter the flammable system and potentially leading to combustion or explosion. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the technical problem to be solved by this utility model is to provide an automatic pressure replenishment device for a sealed container, which automatically replenishes the pressure in the sealed container when the pressure drops in the shell side, thereby reducing equipment costs.

[0005] To achieve the above objectives, this utility model provides an automatic pressure replenishing device for a sealed container, which is applied in a sealed container. The sealed container includes a shell, a liquid inlet, an exhaust outlet, and a heating component. The liquid inlet and the exhaust outlet are both located on the shell. The heating component is located inside the shell. The liquid phase enters the shell through the liquid inlet, and the heating component releases heat to the liquid phase. After the liquid phase turns into a gas phase, it is discharged from the shell through the exhaust outlet. The shell is also provided with a pressure replenishing port, and the automatic pressure replenishing device is connected to the shell through the pressure replenishing port to replenish the pressure of the shell.

[0006] Preferably, the automatic pressure replenishing device includes a pressure replenishing pipe, a valve assembly, and a pressure source. The pressure source is connected to the pressure replenishing port of the housing through the pressure replenishing pipe, and the valve assembly is disposed on the pressure replenishing pipe.

[0007] Preferably, a check valve is also provided on the pressure replenishment pipe between the valve assembly and the pressure replenishment port.

[0008] Preferably, the pressure source is a gas source.

[0009] Preferably, the gas in the pressure source is an inert gas.

[0010] Preferably, the valve assembly includes a self-operated valve, which is set with a starting pressure; when the internal pressure of the housing is less than the starting pressure, the self-operated valve opens, and the pressure source replenishes the pressure in the housing through the pressure replenishment pipe and the valve assembly.

[0011] Preferably, the valve assembly further includes a pressure gauge, which is disposed on the pressure replenishment pipeline between the self-operated valve and the pressure replenishment port.

[0012] Preferably, the valve assembly includes a pneumatic regulating valve, a pressure transmitter, and a pressure indicating controller. The pneumatic regulating valve and the pressure transmitter are both connected to the pressure indicating controller. The pressure transmitter is set with a starting pressure and is used to detect the pressure inside the housing. When the internal pressure of the housing is less than the starting pressure, the pressure transmitter opens the pneumatic regulating valve through the pressure indicating controller, and the pressure source replenishes the pressure into the housing through the pressure replenishment pipe and the valve assembly.

[0013] As described above, the automatic pressure-replenishing device for sealed containers according to this utility model has the following beneficial effects:

[0014] The present invention relates to an automatic pressure replenishment device for sealed containers. The pressure source is connected to the pressure replenishment port of the shell through a pressure replenishment pipe and a valve assembly. When the pressure inside the shell is less than the starting pressure of the valve assembly, the valve assembly automatically opens, and the pressure source replenishes the pressure in the shell, thus preventing a vacuum from occurring inside the shell. This reduces the vacuum design requirements of the shell and lowers the equipment investment cost. On the other hand, it ensures that the inside of the shell is always under positive pressure, preventing air from penetrating into the shell and ensuring system safety. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the first structure of the automatic pressure replenishment device for sealed containers that relates to this utility model.

[0016] Figure 2 This is a schematic diagram of the second structure of the automatic pressure replenishment device for sealed containers involved in this utility model.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Housing; 101. Exhaust port; 102. Liquid inlet; 103. Heating component; 104. Gas phase; 105. Liquid phase; 2. Pressure source; 3. Pressure replenishment pipeline; 4. Check valve; 5. Self-operated valve; 6. Pressure gauge; 7. Pneumatic regulating valve; 8. Pressure indicating controller; 9. Pressure transmitter. Detailed Implementation

[0019] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0020] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0021] like Figure 1 , Figure 2 As shown, this utility model provides an automatic pressure replenishing device for a sealed container, which is applied in a sealed container. The sealed container includes a shell 1, a liquid inlet 102, an exhaust outlet 101, and a heating component 103. The liquid inlet 102 and the exhaust outlet 101 are both provided on the shell 1. The heating component 103 is provided inside the shell 1. The liquid phase 105 enters the shell 1 through the liquid inlet 102. The heating component 103 releases heat to the liquid phase 105. After the liquid phase 105 turns into a gas phase 104, it is discharged from the shell 1 through the exhaust outlet 101. The shell 1 is also provided with a pressure replenishing port. The automatic pressure replenishing device is connected to the shell 1 through the pressure replenishing port to replenish the pressure of the shell 1.

[0022] The present invention relates to an automatic pressure replenishing device for a sealed container, which is connected to the housing 1 through a pressure replenishing port. When the air pressure in the housing 1 decreases, the automatic pressure replenishing device replenishes the pressure in the housing 1 to prevent a vacuum from occurring inside the housing 1. This reduces the vacuum design requirements for the housing 1 and lowers the investment cost of the equipment.

[0023] Preferred, such as Figure 1 , Figure 2 As shown, the automatic pressure replenishing device includes a pressure replenishing pipe 3, a valve assembly, and a pressure source 2. The pressure source 2 is connected to the pressure replenishing port of the housing 1 through the pressure replenishing pipe 3, and the valve assembly is installed on the pressure replenishing pipe 3.

[0024] Furthermore, such as Figure 1 , Figure 2As shown, a check valve 4 is also installed on the pressure replenishment pipe 3 between the valve assembly and the pressure replenishment port. The purpose of installing the check valve 4 is to prevent the gas phase 104 from flowing into the pressure replenishment pipe 3 through the check valve 4 when the liquid phase 105 in the housing 1 changes to the gas phase 104 (i.e., when the pressure in the housing 1 is high).

[0025] Preferably, in this embodiment, the pressure source 2 is a gas source. The gas in the pressure source 2 is an inert gas. The purpose of using an inert gas is to utilize its stability and avoid potential safety hazards. In this embodiment, nitrogen is used as the inert gas; in other embodiments, the inert gas may be chosen depending on the actual situation.

[0026] Preferred, such as Figure 1 As shown, the valve assembly includes a self-operated valve 5, which has a set starting pressure. When the internal pressure of the housing 1 is less than the starting pressure, the self-operated valve 5 opens, and the pressure source 2 replenishes pressure into the housing 1 through the pressure replenishment pipe 3 and the valve assembly. The working principle of the self-operated valve 5 is based on a mechanical spring structure. In this embodiment, the self-operated valve 5 draws pressure from the housing 1. When the pressure inside the housing 1 is less than the elastic force of the spring structure, the self-operated valve 5 opens.

[0027] Furthermore, such as Figure 1 As shown, the valve assembly also includes a pressure gauge 6, which is installed on the pressure replenishment pipe 3 between the self-operated valve 5 and the pressure replenishment port. The purpose of setting the pressure gauge 6 is to adjust the spring setting value of the self-operated valve 5. The self-operated valve 5 is adjusted to the set value at the factory, but it is inevitable that it will need to be fine-tuned according to the actual situation during transportation and application to actual gas conditions.

[0028] Preferred, such as Figure 2 As shown, the valve assembly includes a pneumatic regulating valve 7, a pressure transmitter 9, and a pressure indicating controller 8. The pneumatic regulating valve 7 and the pressure transmitter 9 are both communicatively connected to the pressure indicating controller 8. The pressure transmitter 9 is set with a starting pressure and is used to detect the pressure inside the housing 1. When the internal pressure of the housing 1 is less than the starting pressure, the pressure transmitter 9 opens the pneumatic regulating valve 7 through the pressure indicating controller 8, and the pressure source 2 replenishes the pressure in the housing 1 through the pressure replenishment pipe 3 and the pneumatic regulating valve 7.

[0029] In this embodiment, the valve assembly's starting pressure is 50 kPa, meaning the valve assembly will open when the pressure in the housing 1 is less than 50 kPa. Furthermore, when the valve assembly uses a pressure transmitter 9, the transmitter 9 will automatically adjust the opening of the pneumatic regulating valve 7 based on the pressure parameters in the housing 1, achieving high adjustment accuracy and greater convenience.

[0030] To better describe the working principle of the automatic pressure replenishment device, a closed container in a methane steam reforming reaction is used as an example. The closed container is a steam generator, and the liquid phase 105 in the shell is liquid water, while the gas phase 104 is steam. The working principle is as follows:

[0031] Liquid water enters the shell 1 through the inlet 102. The heating component 103 in the shell 1 heats the liquid water to form water vapor, which then enters the reactor through the outlet 101 and the pipeline. In the reactor, it combines with methane to undergo reforming and conversion reactions to produce a mixed gas of hydrogen and carbon dioxide. The mixed gas passes through a gas-liquid separator and then undergoes a subsequent purification process to produce hydrogen.

[0032] When the hydrogen production system shuts down, water vapor in shell 1 condenses, causing shell 1 to experience a continuous pressure drop or even reach negative pressure. When the pressure in shell 1 is less than the starting pressure of the valve assembly, the valve assembly opens, and the inert gas in pressure source 2 replenishes the pressure in shell 1 through pressure replenishment pipe 3 and valve assembly.

[0033] When the valve assembly uses a self-operated valve 5, the pressure inside the housing 1 is less than the elastic force of the spring structure. The self-operated valve 5 opens, and inert gas is supplied to the housing 1 through the pressure replenishment pipe 3 and the self-operated valve 5, so that the housing 1 is under positive pressure. This can reduce the design requirements of the housing 1 for vacuum.

[0034] When the valve assembly uses a pneumatic regulating valve 7, a pressure transmitter 9, and a pressure indicating controller 8, the pressure transmitter 9 detects the pressure inside the housing 1. When the negative pressure inside the housing 1 is less than the set start-up pressure, the pressure transmitter 9 sends a control signal to the pressure indicating controller 8. The pressure indicating controller 8 receives the control signal and then sends a control signal to the drive source of the pneumatic regulating valve 7. After receiving the control signal, the drive source of the pneumatic regulating valve 7 opens the pneumatic regulating valve 7. Inert gas is then supplied to the housing 1 through the pressure replenishment pipe 3 and the pneumatic regulating valve 7, so that the housing 1 is under positive pressure. This reduces the design requirements of the housing 1 for vacuum.

[0035] The aforementioned pressure replenishment is performed when the pressure inside housing 1 drops below a set value. There are two situations in which the pressure in housing 1 drops below the set value:

[0036] The first type involves a gradual decrease in pressure within the casing 1 (e.g., water vapor condensation during shutdown). When the pressure in the casing 1 reaches the starting pressure of the valve assembly, inert gas enters the casing 1. Since the system is in a shutdown state, the inert gas will not affect the hydrogen production process.

[0037] The second scenario is a sudden drop in pressure in shell 1 (e.g., a malfunction in heating component 103 or a malfunction in the hydrogen production system). In this case, the operator will shut down the entire system for troubleshooting. In this situation, inert gas enters shell 1. Since the hydrogen production process has malfunctioned, it needs to be repaired before normal hydrogen production can proceed. The entry of inert gas into shell 1 will not affect the hydrogen production process.

[0038] Furthermore, using inert gas for pressurization ensures that even if the inert gas enters the reactor, it will not react with the hydrogen and will not burn. However, if air is used for pressurization, it may burn with the hydrogen in the reactor, posing a risk of explosion. Moreover, using inert gas for pressurization maintains the entire hydrogen production system under a slightly positive pressure, preventing air from entering the system and thus avoiding combustion between air and hydrogen, ensuring system safety.

[0039] The present invention relates to an automatic pressure replenishment device for a sealed container. When the pressure inside the housing 1 is less than the starting pressure of the valve assembly, the valve assembly automatically starts, and the pressure source 2 replenishes the pressure in the housing 1, thereby preventing a vacuum from occurring inside the housing 1, reducing the vacuum design requirements of the housing 1, and reducing the investment cost of the equipment.

[0040] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0041] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An automatic pressure supplementing device for a closed container, which is applied in a closed container; the closed container comprises a shell (1), a liquid inlet (102), an exhaust port (101), and a heating assembly (103), the liquid inlet (102) and the exhaust port (101) are arranged on the shell (1); the heating assembly (103) is arranged inside the shell (1), the liquid phase (105) enters the shell (1) through the liquid inlet (102), the heating assembly (103) releases heat to the liquid phase (105), and the liquid phase (105) becomes the gas phase (104) and is discharged from the shell (1) through the exhaust port (101); characterized in that: The shell (1) is further provided with a pressure supplementing port, and the automatic pressure supplementing device is connected with the shell (1) through the pressure supplementing port and is used for supplementing pressure to the shell (1).

2. The automatic pressure makeup device for a closed vessel according to claim 1, characterized by: The automatic pressure supplementing device comprises a pressure supplementing pipeline (3), a valve assembly, and a pressure source (2), the pressure source (2) is connected with the pressure supplementing port of the shell (1) through the pressure supplementing pipeline (3), and the valve assembly is arranged on the pressure supplementing pipeline (3).

3. The automatic pressure makeup device for a closed vessel according to claim 2, characterized by: A check valve (4) is further arranged on the pressure supplementing pipeline (3) between the valve assembly and the pressure supplementing port.

4. The automatic pressure makeup device for a closed vessel according to claim 2, characterized by: The pressure source (2) is a gas source.

5. The automatic pressure makeup device for a closed vessel according to claim 4, characterized by: The gas in the pressure source (2) is an inert gas.

6. The automatic pressure makeup device for a closed vessel according to claim 2, characterized by: The valve assembly comprises a self-operated valve (5), and a starting pressure is set in the self-operated valve (5); when the internal pressure of the shell (1) is less than the starting pressure, the self-operated valve (5) is opened, and the pressure source (2) supplements pressure to the shell (1) through the pressure supplementing pipeline (3) and the valve assembly.

7. The automatic pressure makeup device for a closed vessel according to claim 6, characterized by: The valve assembly further comprises a pressure gauge (6), and the pressure gauge (6) is arranged on the pressure supplementing pipeline (3) between the self-operated valve (5) and the pressure supplementing port.

8. The automatic pressure makeup device for a closed vessel according to claim 2, characterized by: The valve assembly comprises a pneumatic regulating valve (7), a pressure transmitter (9), and a pressure indicating controller (8), the pneumatic regulating valve (7) and the pressure transmitter (9) are connected with the pressure indicating controller (8); the pressure transmitter (9) is provided with a starting pressure, and the pressure transmitter (9) is used for detecting the internal pressure of the shell (1); when the internal pressure of the shell (1) is less than the starting pressure, the pressure transmitter (9) opens the pneumatic regulating valve (7) through the pressure indicating controller (8), and the pressure source (2) supplements pressure to the shell (1) through the pressure supplementing pipeline (3) and the valve assembly.

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