LNG filling station and submerged pump pry device thereof

Abstract

The application provides an LNG filling station and a submerged pump pry device thereof, which comprises a pump pool for storing and conveying LNG; a temporary storage tank for storing the gasified LNG in the main pump pool and connected with a first pressure sensor; a standby pump pool for storing the gasified LNG and / or storing and conveying LNG to receive the gasified LNG in the temporary storage tank when the pressure monitored by the first pressure sensor exceeds a first threshold value of the temporary storage tank; and a reversing valve connected with the main pump pool and the standby pump pool to control one of the main pump pool and the standby pump pool to access a liquid filling circuit and cut off the other one from the liquid filling circuit. The standby pump pool receiving the gasified LNG in the temporary storage tank can reduce the loss of LNG; in addition, when the main pump pool is damaged, the reversing valve can connect the standby pump pool to the liquid filling circuit to ensure the normal operation of the LNG filling station, avoid delaying the liquid filling of a liquid filling vehicle, and improve the experience of users.

Description

Technical Field

[0001] The present invention relates to the technical field of LNG filling stations, and in particular to an LNG filling station and a submersible pump skid device thereof. Background Art

[0002] LNG filling stations often install submersible pumps inside the pump pool so that the LNG in the pump pool can be transported to the filling machine through the submersible pump; when the filling vehicles are discontinuous, the submersible pump will often stop intermittently, and the intermittent shutdown of the submersible pump will cause the LNG in the pump pool to vaporize and increase in pressure. The LNG filling station stores the vaporized LNG in the pump pool through a temporary storage tank above the pump pool; however, when the pressure of the temporary storage tank exceeds the threshold of the temporary storage tank, the pump pool needs to release the vaporized LNG through a two-way safety valve, and the released LNG will cause loss; in addition, when there is a lot of vaporized LNG in the pump pool, it cannot receive the LNG in the storage tank. When the filling vehicle comes, the submersible pump will be in a long-term evacuation state. If the submersible pump stops intermittently and the number of long-term evacuations is frequent, it will cause damage to the submersible pump. Summary of the Invention

[0003] In view of the above problems, the present invention is proposed to provide an LNG filling station and its submersible pump skid device that overcome the above problems or at least partially solve the above problems, which can solve the problem of submersible pump damage and achieve the purpose of improving user experience.

[0004] Furthermore, the present invention can determine whether the standby pump pool is leaking, thereby avoiding losses caused by failure to detect the leakage of the standby pump pool.

[0005] Furthermore, the present invention can reduce the loss of gasified LNG and save costs.

[0006] Specifically, the present invention provides a submersible pump skid device for an LNG filling station, comprising:

[0007] Main pump pool, used to store and transport LNG;

[0008] a temporary storage tank, used to store the gasified LNG in the main pump pool and connected to a first pressure sensor;

[0009] a standby pump pool, configured to store vaporized LNG and / or store and deliver LNG, so as to receive vaporized LNG in the temporary storage tank when the pressure monitored by the first pressure sensor exceeds a first threshold value of the temporary storage tank;

[0010] A reversing valve connects the main pump pool and the backup pump pool to control one of the main pump pool and the backup pump pool to access the liquid adding circuit and cut off the connection between the other and the liquid adding circuit.

[0011] Optionally, the backup pump pool is connected to a second pressure sensor for obtaining a pressure value in the backup pump pool;

[0012] The second pressure sensor and the first pressure sensor are further connected to a controller, and the controller is configured to:

[0013] Acquiring a first pressure value in the temporary storage tank via the first pressure sensor, and acquiring a second pressure value in the backup pump pool via the second pressure sensor;

[0014] In response to the first pressure value exceeding a first threshold, charging the vaporized LNG from the temporary storage tank into the backup pump pool;

[0015] In response to the first pressure value increasing or remaining unchanged, it is determined whether the second pressure value decreases, and if so, it is determined that the backup pump pool is leaking.

[0016] Optionally, the liquid adding circuit includes an input pipeline and an output pipeline; the reversing valve includes one inlet and three outlets, and the inlet of the reversing valve is connected to the input pipeline; the first outlet of the reversing valve is connected to the main pump pool, the second outlet of the reversing valve is connected to the backup pump pool, and the third outlet of the reversing valve is connected to the output pipeline; the inlet of the reversing valve is connected to one of the outlets of the reversing valve, and the connection with the other two outlets of the reversing valve is cut off.

[0017] Optionally, the temporary storage tank is connected to the backup pump pool via the first electrically controlled valve and the second electrically controlled valve in sequence; the temporary storage tank is connected to the main pump pool via the first electrically controlled valve and the third electrically controlled valve in sequence; the second electrically controlled valve and the third electrically controlled valve are each connected in series to the first electrically controlled valve, and the second electrically controlled valve and the third electrically controlled valve are arranged in parallel.

[0018] Optionally, the controller is further connected to the first electrically controlled valve, the second electrically controlled valve, and the third electrically controlled valve, and the controller is configured to:

[0019] In response to the first pressure value exceeding the first threshold and the second pressure value being less than a second threshold, controlling the first electrically controlled valve and the second electrically controlled valve to be open and the third electrically controlled valve to be closed;

[0020] In response to the first pressure value not exceeding the first threshold, the second electrically controlled valve is controlled to close.

[0021] Optionally, in response to the second pressure value reaching a second threshold, the controller controls the second electrically controlled valve to close so that the backup pump pool maintains a stable pressure state.

[0022] Optionally, in response to the backup pump pool being connected to the liquid adding circuit via the reversing valve, the controller controls the first electrically controlled valve and the third electrically controlled valve to be closed, and the second electrically controlled valve to be open.

[0023] Optionally, the backup pump pool is connected to a first inlet of a two-way safety valve via a first valve, and the backup pump pool is connected to a second inlet of the two-way safety valve via a second valve;

[0024] In response to the second pressure value exceeding a third threshold value after the backup pump pool is connected to the liquid adding circuit via the reversing valve, the two-way safety valve opens to release the gasified LNG in the backup pump pool.

[0025] Optionally, the main pump pool is connected to the temporary storage tank via a third valve and a first one-way valve in sequence, so that the gasified LNG in the main pump pool flows into the temporary storage tank.

[0026] The present invention also provides an LNG filling station, comprising:

[0027] a storage tank configured to store and deliver LNG;

[0028] a liquid dispenser configured to deliver the LNG;

[0029] The submersible pump skid device as described in any of the above items is connected between the storage tank and the liquid charging machine.

[0030] In the submersible pump skid device of the LNG filling station of the present invention, a backup pump pool and a reversing valve are added next to the main pump pool. The reversing valve can cut off the connection between the main pump pool and the liquid filling circuit when the main pump pool is damaged, and connect the backup pump pool to the liquid filling circuit to ensure that the gas filling station can work normally, avoid shutdowns delaying the filling of liquid filling vehicles, and enhance user experience.

[0031] Furthermore, after the temporary storage tank inputs gasified LNG into the backup pump pool, the present invention can determine whether the pressure value detected by the backup pump pool is reduced based on the pressure monitored by the pressure sensor connected to the backup pump pool. If so, it is determined that the backup pump pool is leaking, avoiding the loss caused by the failure to detect the leakage of the backup pump pool.

[0032] Furthermore, the backup pump pool can receive the gasified LNG in the temporary storage tank, reducing the pressure of the main pump pool and the temporary storage tank, while reducing LNG loss.

[0033] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0035] Figure 1 is a schematic process diagram of an LNG filling station according to an embodiment of the present application;

[0036] Figure 2 is a schematic enlarged process diagram of a submersible pump skid arrangement in Figure 1

[0037] Figure 3 is a schematic structural diagram of a controller according to an embodiment of the present application. DETAILED DESCRIPTION

[0038] Embodiments of an LNG filling station and a submersible pump skid arrangement thereof will be described below with reference to Figures 1 to 3 In the description of the embodiments, it is to be understood that the terms "first", "second", "third" and the like, do not imply or otherwise suggest any relative importance of the referred features and the number of the features so designated. Thus, a feature defined with "first", "second", "third" or the like, can explicitly or implicitly include at least one of the feature, i.e. one or more of the feature. In the description of the embodiments, the term "plurality" means at least two, e.g. two, three, etc., unless otherwise specifically limited. When a certain feature "includes" or "comprises" a certain or certain features, it means that the feature does not exclude other features and can further include other features, unless otherwise specifically described.

[0039] Unless otherwise defined, the terms "set", "mounted", "connected", "linked", "fixed", "coupled" and the like, are to be construed broadly, e.g. can be fixed connection, can be detachable connection, or integral; can be mechanical connection, can be electrical connection; can be direct connection, can be indirect connection through an intermediate medium, can be internal connection of two elements, or can be interaction relationship of two elements, unless otherwise specifically limited. Those skilled in the art should be able to understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0040] In addition, in the description of the embodiments, the first feature "above" or "below" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. That is, in the description of the embodiments, the first feature "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher in horizontal height than the second feature. The first feature "below", "under" or "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or only means that the first feature is lower in horizontal height than the second feature.

[0041] ​In the description of the present embodiment, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples.

[0042] Figure 2 Yes Figure 1 The schematic enlarged process diagram of the submersible pump skid device is as follows: Figure 2 As shown, and reference Figure 1 and Figure 3 An embodiment of the present invention provides a submersible pump skid device for an LNG filling station, comprising: a main pump tank 1 for storing and transporting LNG; a temporary storage tank 16 for storing vaporized LNG in the main pump tank 1 and connected to a first pressure sensor 15; a backup pump tank 3 for storing vaporized LNG and / or storing and transporting LNG, so as to receive the vaporized LNG in the temporary storage tank 16 when the pressure monitored by the first pressure sensor 15 exceeds a first threshold value of the temporary storage tank 16; a reversing valve 7 connecting the main pump tank 1 and the backup pump tank 3 to control one of the main pump tank 1 and the backup pump tank 3 to connect to the liquid filling circuit and cut off the connection between the other and the liquid filling circuit.

[0043] In this embodiment, based on the existing technical solution, the present invention adds a backup pump pool 3 and a reversing valve 7 next to the main pump pool 1. The reversing valve 7 can disconnect the main pump pool 1 from the liquid filling circuit when the main pump pool 1 is damaged, connecting the backup pump pool 3 to the liquid filling circuit, ensuring the normal operation of the gas filling station, avoiding downtime that delays the filling of liquid filling vehicles, and improving the user experience. Furthermore, the backup pump pool 3 can receive the vaporized LNG in the temporary storage tank 16, reducing the pressure of the main pump pool 1 and the temporary storage tank 16, and at the same time reducing LNG loss.

[0044] The reversing valve 7 used in the present invention is a three-position four-way solenoid valve, which can switch the flow position of LNG to ensure that the three-position four-way solenoid valve has only one output port. When the three-position four-way solenoid valve connects the main pump pool 1 to the liquid adding pipeline, the three-position four-way solenoid valve cuts off the connection between the liquid adding pipeline and the backup pump pool 3; when the three-position four-way solenoid valve connects the backup pump pool 3 to the liquid adding pipeline, the three-position four-way solenoid valve cuts off the connection between the liquid adding pipeline and the main pump pool 1, ensuring that the three-position four-way solenoid valve only delivers LNG to one pump pool at the same time.

[0045] In some embodiments of the present invention, Figure 2As shown, the backup pump pool 3 is connected to a second pressure sensor 6 for obtaining the pressure value in the backup pump pool 3; the second pressure sensor 6 and the first pressure sensor 15 are also connected to a controller 500, and the controller 500 is configured as follows:

[0046] A first pressure value in the temporary storage tank 26 is acquired via the first pressure sensor 15 , and a second pressure value in the backup pump pool 3 is acquired via the second pressure sensor 6 .

[0047] In response to the first pressure value exceeding the first threshold, the vaporized LNG is charged from the temporary storage tank 16 into the backup pump pool 3 .

[0048] In response to the first pressure value increasing or remaining unchanged, it is determined whether the second pressure value decreases, and if so, it is determined that the standby pump pool 3 is leaking.

[0049] Preferably, the first pressure value is the pressure in the temporary storage tank 16 obtained by the first pressure sensor 15 , and the second pressure value is the pressure in the standby pump pool 3 obtained by the second pressure sensor 6 .

[0050] In this embodiment, a backup pump pool 3 is added to the original technical solution. The backup pump pool 3 needs to be airtight and pressurized for standby. The present invention uses a second pressure sensor 6 to detect the pressure of the backup pump pool 3. The controller 500 determines whether the backup pump pool 3 is leaking based on the detected pressure value, thereby avoiding the aging and leakage of the backup pump pool 3 when it is not used for a long time. Specifically, the controller 500 first obtains the pressure value of the temporary storage tank 16 through the first pressure sensor 15, and obtains the pressure value of the backup pump pool 3 through the second pressure sensor 6; when the pressure value of the temporary storage tank 16 exceeds the first threshold, the controller 500 controls some valves to open, allowing the gasified LNG in the temporary storage tank 16 to flow into the backup pump pool 3; when the pressure value of the temporary storage tank 16 increases or remains unchanged, the controller 500 determines whether the second pressure value decreases based on the pressure detected by the second pressure sensor 6. If the pressure value decreases, it is determined that the backup pump pool 3 is leaking, thereby avoiding the loss caused by the failure to detect the leakage of the backup pump pool 3.

[0051] In some embodiments of the present invention, the liquid adding circuit includes an input pipeline and an output pipeline; the reversing valve 7 includes one inlet and three outlets, and the inlet of the reversing valve 7 is connected to the input pipeline; the first outlet of the reversing valve 7 is connected to the main pump pool 1, the second outlet of the reversing valve 7 is connected to the backup pump pool 3, and the third outlet of the reversing valve 7 is connected to the output pipeline; the inlet of the reversing valve 7 is connected to one of the outlets of the reversing valve 7, and the connection with the other two outlets of the reversing valve 7 is cut off.

[0052] Preferably, the storage tank 100 is connected with the main pump pool 1 or the standby pump pool 3 through a liquid filling circuit, an input pipeline in the liquid filling circuit is used to transport the LNG in the storage tank 100 to the main pump pool 1 or the standby pump pool 3, and an output pipeline in the liquid filling circuit is used to transport the LNG in the main pump pool 1 or the standby pump pool 3 to the storage tank 100 when the liquid level in the main pump pool 1 or the standby pump pool 3 exceeds a set liquid level, so that the LNG in the storage tank 100 is not continuously filled into the main pump pool 1 or the standby pump pool 3, and damage to the main pump pool 1 or the standby pump pool 3 is avoided.

[0053] Specifically, the input of the reversing valve 7 is connected with the input pipeline, the first output of the reversing valve 7 is connected with the main pump pool 1, the second output of the reversing valve 7 is connected with the standby pump pool 3, and the third output of the reversing valve 7 is connected with the output pipeline. When the main pump pool 1 is normally used, the reversing valve 7 connects the main pump pool 1 to the liquid filling circuit and disconnects the standby pump pool 3 from the liquid filling circuit. When the main pump pool 1 is damaged, the reversing valve 7 switches the LNG transport position from the main pump pool 1 to the standby pump pool 3 and disconnects the main pump pool 1 from the liquid filling circuit. When neither the main pump pool 1 nor the standby pump pool 3 can be used, the reversing valve 7 directly connects the output pipeline, thereby reducing the LNG loss.

[0054] In some embodiments of the present application, the temporary storage tank 16 is connected with the standby pump pool 3 through the first electric control valve 18 and the second electric control valve 22 in sequence, the temporary storage tank 16 is connected with the main pump pool 1 through the first electric control valve 18 and the third electric control valve 20 in sequence, and the second electric control valve 22 and the third electric control valve 20 are connected in series with the first electric control valve 18 and are arranged in parallel with each other.

[0055] In the present embodiment, the temporary storage tank 16 is connected with the standby pump pool 3 through the first electric control valve 18 and the second electric control valve 22 in sequence, and the temporary storage tank 16 is connected with the main pump pool 1 through the first electric control valve 18 and the third electric control valve 20 in sequence, so that the controller 500 can control the opening and closing of the first electric control valve 18, the second electric control valve 22 and the third electric control valve 20 to realize the connection or disconnection between the temporary storage tank 16 and the main pump pool 1 or the temporary storage tank 16 and the standby pump pool 3.

[0056] In addition, the second one-way valve 17 and the three-way valve 26 are further connected between the temporary storage tank 16 and the first electric control valve 18, and the second one-way valve 17 can prevent the gas flowing out of the temporary storage tank 16 from flowing back into the temporary storage tank 16.

[0057] In some embodiments of the present application, the controller 500 is further connected with the first electric control valve 18, the second electric control valve 22 and the third electric control valve 20, and the controller 500 is configured to:

[0058] In response to the first pressure value exceeding the first threshold and the second pressure value being less than the second threshold, the first electrically controlled valve 18 and the second electrically controlled valve 22 are controlled to be open, and the third electrically controlled valve 20 is controlled to be closed.

[0059] In response to the first pressure value not exceeding the first threshold value, the second electrically controlled valve 22 is controlled to close.

[0060] Preferably, the first pressure value is the pressure in the temporary storage tank 16 obtained by the first pressure sensor 15, the second pressure value is the pressure in the backup pump pool 3 obtained by the second pressure sensor 6, the first threshold is one of the set thresholds of the temporary storage tank 16, and the second threshold is one of the set thresholds of the backup pump pool 3.

[0061] Specifically, when the first pressure value exceeds the first threshold and the second pressure value is less than the second threshold, the controller 500 controls the first electrically controlled valve 18 and the second electrically controlled valve 22 to open, and the third electrically controlled valve 20 to close, so that the temporary storage tank 16 is connected to the backup pump pool 3, and the gas in the temporary storage tank 16 is transported to the backup pump pool 3, thereby relieving the pressure of the main pump pool 1 and the temporary storage tank 16 and reducing the loss of vaporized LNG; when the first pressure value does not exceed the first threshold, the controller 500 controls the second electrically controlled valve 22 to close, and the main pump pool 1 transports the vaporized LNG to the temporary storage tank 16, and the temporary storage tank 16 does not need to transport gas to the backup pump pool 3.

[0062] In some embodiments of the present invention, in response to the second pressure value reaching a second threshold, the controller 500 controls the second electrically controlled valve 22 to close so that the backup pump pool 3 maintains a stable pressure state.

[0063] Preferably, the second pressure value is the pressure in the backup pump pool 3 acquired by the second pressure sensor 6 , and the second threshold is a set threshold of the backup pump pool 3 .

[0064] When the second pressure value reaches the second threshold value, the controller 500 controls the second electric control valve 22 to close, and the backup pump pool 3 no longer receives the gasified LNG in the temporary storage tank 16, but stabilizes the pressure so that it can be put into use in time when the main pump pool 1 is damaged. The connecting outlet of the reversing valve 7 can be switched directly from the main pump pool 1 to the backup pump pool 3 without waiting for the pressure in the backup pump pool 3 to rise to the set value. The connecting outlet of the reversing valve 7 takes the time to switch from the main pump pool 1 to the backup pump pool 3, thereby improving the user experience.

[0065] In some embodiments of the present invention, in response to the backup pump pool 3 being connected to the liquid adding circuit via the reversing valve 7 , the controller 500 controls the first electrically controlled valve 18 and the third electrically controlled valve 20 to close, and the second electrically controlled valve 22 to open.

[0066] In the embodiment, when the main pump pool 1 is temporarily disabled, the standby pump pool 3 is connected to the liquid filling circuit through the reversing valve 7, the controller 500 controls the second electric control valve 22 to open, so that the LNG in the standby pump pool 3 can be transported to the liquid filling machine 200 to fill the vehicle; the controller 500 controls the first electric control valve 18 and the third electric control valve 20 to close, so that when the standby pump pool 3 transports the LNG to the liquid filling machine 200, the LNG can not flow into the main pump pool 1 through the third electric control valve 20, and the LNG can not flow to the temporary storage tank 16 through the first electric control valve 18, thereby avoiding the loss of LNG.

[0067] In some optional embodiments, when the main pump pool 1 is disabled and the standby pump pool 3 does not transport the LNG to the liquid filling machine 200, in the state that the pressure of the temporary storage tank 16 is higher than the pressure of the standby pump pool 3, the controller 500 controls the first electric control valve 18 and the second electric control valve 22 to open, so that the LNG vaporized in the temporary storage tank 16 flows into the standby pump pool 3, and the LNG vaporized again is used.

[0068] In some embodiments of the present application, the standby pump pool 3 is connected to the first inlet of the two-way safety valve 23 through the first valve 24, and the standby pump pool 3 is connected to the second inlet of the two-way safety valve 23 through the second valve 25; as the second pressure value exceeds the third threshold value after the standby pump pool 3 is connected to the liquid filling circuit through the reversing valve 7, the two-way safety valve 23 opens to release the LNG vaporized in the standby pump pool 3.

[0069] Preferably, the third threshold value is the critical pressure value at which the two-way safety valve 23 opens.

[0070] In the embodiment, the connection relationship between the two-way safety valve 23 and the standby pump pool 3 is that the standby pump pool 3 is connected to the first inlet of the two-way safety valve 23 through the first valve 24, and the standby pump pool 3 is connected to the second inlet of the two-way safety valve 23 through the second valve 25, and the first valve 24 and the second valve 25 are connected in parallel. During the period that the standby pump pool 3 is connected to the liquid filling circuit through the reversing valve 7, when the pressure of the standby pump pool 3 exceeds the third threshold value, the two-way safety valve 23 opens to release the excessive LNG vaporized in the standby pump pool 3.

[0071] In some embodiments of the present application, the main pump pool 1 is connected to the temporary storage tank 16 through the third valve 13 and the first one-way valve 12 in sequence, so that the LNG vaporized in the main pump pool 1 flows into the temporary storage tank 16.

[0072] The main pump pool is connected to the temporary storage tank 16 through the third valve 13 and the first one-way valve 12 in sequence, so that the LNG vaporized in the main pump pool 1 flows into the temporary storage tank 16, and the first one-way valve 12 can prevent the gas flowing into the temporary storage tank 16 from flowing back into the main pump pool 1.

[0073] Preferably, a third pressure sensor 9 is provided on the input pipeline connecting the storage tank 100 and the reversing valve 7 to monitor the pressure of the input pipeline, and a fourth pressure sensor 5 is connected to the main pump pool 1 to monitor the pressure of the main pump pool 1.

[0074] In some embodiments of the present invention, the circulation between the temporary storage tank 16 and the main pump tank 1 is controlled by the first electrically controlled valve 18 and the third electrically controlled valve 20. When the controller 500 controls the opening of the first electrically controlled valve 18 and the third electrically controlled valve 20 based on the relationship between the pressure monitored by the pressure sensor and the temperature monitored by the temperature sensor and preset conditions, the gas in the temporary storage tank 16 flows into the main pump tank 1 through the second one-way valve 17, the three-way valve 26, the first electrically controlled valve 18, and the third electrically controlled valve 20 in sequence, thereby reusing the LNG flowing out of the main pump tank 1, reducing LNG loss and saving costs.

[0075] In some embodiments of the present invention, the temporary storage tank 16 has four connection ports. The first connection port is connected to the first electrically controlled valve 18 via the second one-way valve 17 and the three-way valve 26 in sequence. The second connection port is connected to the main pump pool 1 via the first one-way valve 12 and the third valve 13 in sequence. The third connection port is connected to the second inlet of the second two-way safety valve 14. The fourth connection port is connected to the first pressure sensor 15.

[0076] In some embodiments of the present invention, the submersible pump skid device further includes: a fourth electrically controlled valve 11, connected between the first inlet of the second two-way safety valve 14 and the main pump tank 1, and connected to a controller 500; the controller 500 is configured to control the opening and closing of the fourth electrically controlled valve 11 based on the relationship between the pressure monitored by the pressure sensor, the temperature monitored by the temperature sensor, and preset conditions. The first inlet of the second two-way safety valve 14 is connected to the main pump tank 1 through the fourth electrically controlled valve 11 and the fourth valve 10, so that when the pressure in the main pump tank 1 reaches a preset pressure value, the controller 500 controls the fourth electrically controlled valve 11 to open, allowing the second two-way safety valve 14 to release the gasified LNG in the main pump tank 1, so that the LNG in the storage tank 100 can flow into the main pump tank 1 from the input pipeline.

[0077] Preferably, the present invention uses a temperature sensor to monitor the temperature of the environment in which the gas filling station is located.

[0078] In some optional embodiments of the present invention, the controller is configured to:

[0079] When the temperature monitored by the temperature sensor is higher than a first preset temperature and the pressure of the input pipeline is not less than a first preset pressure value, the first electrically controlled valve 18 is controlled to close and the fourth electrically controlled valve 11 is controlled to open. Alternatively, when the temperature monitored by the temperature sensor is higher than the first preset temperature and the pressure of the input pipeline is less than a second preset pressure value, the first electrically controlled valve 18 is controlled to open, the third electrically controlled valve 20 is controlled to open, and the fourth electrically controlled valve 11 is controlled to close. Alternatively, when the temperature monitored by the temperature sensor is higher than the first preset temperature, the fourth electrically controlled valve 11 is opened, and the pressure of the temporary storage tank 16 continues to increase or remains at a maximum value, the first electrically controlled valve 18 and the third electrically controlled valve 20 are controlled to open.

[0080] In this embodiment, the first preset temperature is 25°C, and the control method executed by the controller 500 is: when the temperature monitored by the temperature sensor is higher than 25°C and the pressure of the input pipeline is not less than the first preset pressure value, the controller 500 controls the first electrically controlled valve 18 to close, the fourth electrically controlled valve 11 to open, and the second two-way safety valve 14 to open to release the gasified LNG in the main pump pool 1 connected to the first inlet; or, when the temperature monitored by the temperature sensor is higher than 25°C and the pressure of the input pipeline is less than the second preset pressure value, the controller 500 controls the first electrically controlled valve 18 to open, the third electrically controlled valve 30 to open, and the fourth electrically controlled valve 14 to open. 11 is closed, and the gas in the temporary storage tank 16 flows into the main pump pool 1 through the first electrically controlled valve 18 and the third electrically controlled valve 20, and is reused by the main pump pool 1 to reduce LNG loss; or, when the temperature monitored by the temperature sensor is higher than 25°C, the fourth electrically controlled valve 11 is opened and the pressure of the temporary storage tank 16 continues to increase or remains at the maximum value, the controller 500 controls the first electrically controlled valve 18 to open, and the second two-way safety valve 14 to open to release the vaporized LNG, and at the same time, the gas in the temporary storage tank 16 flows into the main pump pool 1 through the first electrically controlled valve 18 and the third electrically controlled valve 20, so as to reduce the pressure of the main pump pool 1 and ensure the safety of the gas station.

[0081] In some embodiments of the present invention, when the temperature monitored by the temperature sensor is higher than the first preset temperature and the pressure of the input pipeline is not less than the first preset pressure value, controlling the first electrically controlled valve 18 to close and the fourth electrically controlled valve 11 to open includes:

[0082] Within the first preset time, when the pressure of the main pump tank 1 remains unchanged, the controller 500 controls the first electrically controlled valve 18 to open and controls the first preset pressure value to decrease by the third preset pressure value every first preset time; or, within the first preset time, when the pressure of the main pump tank 1 increases, the controller 500 controls the first electrically controlled valve 18 to open and the third electrically controlled valve 20 to open.

[0083] In the embodiment, the first preset time is thirty minutes, the third preset pressure value is 0.2 KPa, and the first preset temperature is 25℃. In the state that the temperature monitored by the temperature sensor is higher than the first preset temperature, the pressure of the input pipeline is not less than the first preset pressure value, the first electric control valve 18 is closed, and the fourth electric control valve 11 is opened, the first case is that, within thirty minutes, if the pressure in the main pump pool 1 remains unchanged, the controller 500 controls the first electric control valve 18 to be opened and the third electric control valve 20 to be opened, and the first preset pressure value is reduced by 0.2 KPa every thirty minutes. The second case is that, within thirty minutes, when the pressure in the main pump pool 1 increases, the controller 500 controls the first electric control valve 18 to be opened and the third electric control valve 20 to be opened, and the gasified LNG in the main pump pool 1 is released from the second two-way safety valve 14, and the gas in the temporary storage tank 16 flows to the main pump pool 1, so that the temporary storage tank 16 and the main pump pool 1 form a circulation to reduce the pressure of the main pump pool 1 and the temporary storage tank 16.

[0084] In some embodiments of the application, when the temperature monitored by the temperature sensor is higher than the first preset temperature and the pressure of the input pipeline is less than the second preset pressure value, the first electric control valve 18 is controlled to be opened, the third electric control valve 20 is controlled to be opened, and the fourth electric control valve 11 is controlled to be closed, including:

[0085] Within the first preset time, if the pressure of the temporary storage tank 16 does not decrease and the pressure of the main pump pool 1 does not increase, the controller 500 controls the fourth electric control valve 11 to be opened, and the second preset pressure value is reduced by a third preset pressure value every second preset time; or, within the first preset time, if the pressure of the temporary storage tank 16 does not decrease and the pressure of the main pump pool 1 increases, the controller 500 controls the second preset pressure value to be reduced by a fourth preset pressure value every second preset time; or, within the first preset time, if the pressure of the temporary storage tank 16 decreases and the pressure of the input pipeline decreases, the controller 500 controls the first electric control valve 18 to be closed; or, within the first preset time, if the pressure of the temporary storage tank 16 decreases and the pressure of the input pipeline does not decrease, the controller 500 controls the second preset pressure value to be increased by a fourth preset pressure value every second preset time.

[0086] In this embodiment, the first preset temperature is 25°C, the first preset time is thirty minutes, the third preset pressure value is 0.2KPa, the fourth preset pressure value is 0.1KPa, and the second preset time is ten minutes; when the temperature monitored by the temperature sensor is higher than 25°C and the pressure of the input pipeline is less than the second preset pressure value, the first electrically controlled valve 18 is opened, the third electrically controlled valve 20 is opened, and the fourth electrically controlled valve 11 is closed, the first situation: within thirty minutes, when the pressure of the temporary storage tank 16 does not decrease and the pressure of the main pump pool 1 does not increase, the controller 500 controls the fourth electrically controlled valve 11 to open, and at the same time controls the second preset pressure value to decrease by 0.2KPa every ten minutes, and adjusts the second preset pressure value so that the controller 500 can control the opening and closing of the first electrically controlled valve 18, the third electrically controlled valve 20, and the fourth electrically controlled valve 11 more accurately; The second situation: within thirty minutes, the pressure of the temporary storage tank 16 does not decrease, and the pressure of the main pump pool 1 increases. The controller 500 controls the second preset pressure value to decrease by 0.1 KPa every ten minutes, so that the controller 500 controls the opening and closing of the first electrically controlled valve 18, the third electrically controlled valve 20, and the fourth electrically controlled valve 11 more accurately to ensure that the pressure of the main pump pool 1 is within the preset range; the third situation: within thirty minutes, the pressure of the temporary storage tank 16 decreases, and the pressure of the input pipeline decreases. The controller 500 controls the first electrically controlled valve 18 to close, so as to keep the pressure of the main pump pool 1 within an appropriate range; the fourth situation: within thirty minutes, when the pressure of the temporary storage tank 16 decreases and the pressure of the input pipeline does not decrease, the controller 500 controls the second preset pressure value to increase by 0.1 KPa every ten minutes to adjust the second preset pressure value.

[0087] In some embodiments of the present invention, the controller 500 is configured to:

[0088] When the temperature monitored by the temperature sensor is not higher than the first preset temperature and the pressure of the input pipeline is not less than the fifth preset pressure value, the controller 500 controls the first electrically controlled valve 18 to close and the fourth electrically controlled valve 11 to open; or, when the temperature monitored by the temperature sensor is not higher than the first preset temperature and the pressure of the input pipeline is less than the sixth preset pressure value, the controller 500 controls the first electrically controlled valve 18 to open, the third electrically controlled valve 20 to open, and the fourth electrically controlled valve 11 to close; or, when the temperature monitored by the temperature sensor is not higher than the first preset temperature, the fourth electrically controlled valve 11 is opened and the pressure of the temporary storage tank 16 continues to increase or remains at the maximum value, the controller 500 controls the first electrically controlled valve 18 to open and the third electrically controlled valve 20 to open.

[0089] In this embodiment, the first preset temperature is 25°C, and the specific control method is:

[0090] When the temperature monitored by the temperature sensor is not higher than 25°C and the pressure of the input pipeline is not less than the fifth preset pressure value, the controller 500 controls the first electrically controlled valve 18 to close and the fourth electrically controlled valve 11 to open, so that the second two-way safety valve 14 can relieve the pressure of the main pump pool 1; or, when the temperature monitored by the temperature sensor is not higher than 25°C and the pressure of the input pipeline is less than the sixth preset pressure value, the controller 500 controls the first electrically controlled valve 18 to open, the third electrically controlled valve 20 to open, and the fourth electrically controlled valve 11 to close, so that the gas in the temporary storage tank 16 flows into the main pump pool 1, and the gasified LNG is reused to reduce LNG loss; or, when the temperature monitored by the temperature sensor is not higher than 25°C, the fourth electrically controlled valve 11 is opened and the pressure of the temporary storage tank 16 continues to increase or remains at the maximum value, the controller 500 controls the first electrically controlled valve 18 to open and the third electrically controlled valve 20 to open, so that the gas in the temporary storage tank 16 can flow into the main pump pool 1 and the pressure of the temporary storage tank 16 can be reduced.

[0091] In some embodiments of the present invention, when the temperature monitored by the temperature sensor is not higher than the first preset temperature and the pressure of the input pipeline is not less than the fifth preset pressure value, the controller 500 controls the first electrically controlled valve 18 to close and the fourth electrically controlled valve 11 to open, including:

[0092] During the first preset time, the pressure of the main pump tank 1 remains unchanged, and the controller 500 controls the first electrically controlled valve 18 to open and controls the fifth preset pressure value to decrease by the third preset pressure value every first preset time; or, during the first preset time, the pressure of the main pump tank 1 increases, and the controller 500 controls the first electrically controlled valve 18 to open and the third electrically controlled valve 20 to open.

[0093] In this embodiment, the first preset temperature is 25°C, the first preset time is thirty minutes, and the third preset pressure value is 0.2KPa; when the temperature monitored by the temperature sensor is not higher than 25°C, the pressure of the input pipeline is not less than the fifth preset pressure value, the first electrically controlled valve 18 is closed, and the fourth electrically controlled valve 11 is opened, the first situation: within thirty minutes, if the pressure of the main pump pool 1 remains unchanged, the controller 500 controls the first electrically controlled valve 18 to open, the third electrically controlled valve 20 to open, and controls the fifth preset pressure value to decrease by 0.2KPa every thirty minutes, so as to keep the pressure of the main pump pool 1 and the temporary storage tank 16 within the preset range; the second situation: within thirty minutes, the pressure of the main pump pool 1 increases, and the controller 500 controls the first electrically controlled valve 18 to open and the third electrically controlled valve 20 to open, so that the temporary storage tank 16 and the main pump pool 1 form a circulation to reduce the pressure of the main pump pool 1.

[0094] In some embodiments of the present application, when the temperature monitored by the temperature sensor is not higher than the first preset temperature and the pressure of the input pipeline is less than the sixth preset pressure value, the controller 500 controls the first electric control valve 18 to open, the third electric control valve 20 to open, and the fourth electric control valve 11 to close, including:

[0095] In the first preset time, if the pressure of the temporary storage tank 16 does not decrease and the pressure of the main pump pool 1 does not increase, the controller 500 controls the fourth electric control valve 11 to open and controls the sixth preset pressure value to decrease by the third preset pressure value every second preset time; or, in the first preset time, if the pressure of the temporary storage tank 16 does not decrease and the pressure of the main pump pool 1 increases, the controller 500 controls the sixth preset pressure value to decrease by the fourth preset pressure value every second preset time; or, in the first preset time, if the pressure of the temporary storage tank 16 decreases and the pressure of the input pipeline decreases, the controller 500 controls the first electric control valve 18 to close; or, in the first preset time, if the pressure of the temporary storage tank 16 decreases and the pressure of the input pipeline does not decrease, the controller 500 controls the sixth preset pressure value to increase by the fourth preset pressure value every second preset time.

[0096] In the present embodiment, the first preset temperature is 25℃, the first preset time is thirty minutes, the third preset pressure value is 0.2KPa, the fourth preset pressure value is 0.1KPa, and the second preset time is ten minutes; in the state that the temperature monitored by the temperature sensor is not higher than 25℃, the pressure of the input pipeline is less than the sixth preset pressure value, the first electric control valve 18 is open, the third electric control valve 20 is open, and the fourth electric control valve 11 is closed, the first case is that, in thirty minutes, the pressure of the temporary storage tank 16 does not decrease and the pressure of the main pump pool 1 does not increase, the controller 500 controls the fourth electric control valve 11 to open and controls the sixth preset pressure value to decrease by 0.2KPa every ten minutes, so as to adjust the sixth preset pressure value and keep the pressures of the main pump pool 1 and the temporary storage tank 16 in the preset range; the second case is that, in thirty minutes, the pressure of the temporary storage tank 16 does not decrease and the pressure of the main pump pool 1 increases, the controller 500 controls the sixth preset pressure value to decrease by 0.1KPa every ten minutes, so as to adjust the sixth preset pressure value and keep the pressures of the main pump pool 1 and the temporary storage tank 16 in the preset range; the third case is that, in thirty minutes, the pressure of the temporary storage tank 16 decreases and the pressure of the input pipeline decreases, the controller 500 controls the first electric control valve 18 to close, so as to keep the pressure of the main pump pool 1 in the appropriate pressure range and reduce the amount of gasified LNG; in thirty minutes, when the pressure of the temporary storage tank 16 decreases and the pressure of the input pipeline does not decrease, the controller 500 controls the sixth preset pressure value to increase by 0.1KPa every ten minutes, so as to adjust the sixth preset pressure value and keep the pressures of the main pump pool 1 and the temporary storage tank 16 in the appropriate pressure range.

[0097] In some embodiments of the present invention, a temporary storage tank 16 is added to the pressure relief branch above the main pump pool 1, and the controller 500 realizes the on-off of the circulation of the temporary storage tank 16 and the main pump pool 1 by controlling the opening and closing of the first electrically controlled valve 18 and the third electrically controlled valve 20; the pressure of the temporary storage tank 16 monitored by the first pressure sensor 15 is the pressure of the temporary storage tank 16, the pressure monitored by the third pressure sensor 9 is the pressure of the input pipeline, and the pressure monitored by the fourth pressure sensor 5 is the pressure of the main pump pool 1; the measurement value of the fourth pressure sensor 5 is P1, the measurement value of the third pressure sensor 9 is P2, and the measurement value of the first pressure sensor 15 is P3 When the ambient temperature is higher than 25°C, the initial values ​​of the pressure thresholds adopt the low pressure thresholds Pamin and Pamax, the first preset pressure value is Pamax, and the second preset pressure value is Pamin; the first preset temperature is 25°C, and when the ambient temperature is equal to or lower than 25°C, the initial values ​​of the pressure thresholds adopt the high pressure thresholds Pbmin and Pbmax, the fifth preset pressure value is Pbmax, and the sixth preset pressure value is Pbmin; the third preset pressure value is 0.2 kPa, and the fourth preset pressure value is 0.1 kPa; taking the ambient temperature higher than 25°C as an example, the controller 500 is configured as follows:

[0098] (1) When P2 ≥ Pamax, the fourth electrically controlled valve 11 is opened and the first electrically controlled valve 18 is closed.

[0099] If P1 remains unchanged within 30 minutes, the first electrically controlled valve 18 and the third electrically controlled valve 20 are opened, and Pamax is reduced by 0.2 KPa every 30 minutes.

[0100] If P1 increases within 30 minutes, the first electrically controlled valve 18 and the third electrically controlled valve 20 are kept open.

[0101] (2)P2 <Pamin时,关闭第四电控阀11,打开第一电控阀18和第三电控阀20。

[0102] If P3 does not decrease and P1 does not increase within 30 minutes, the fourth electrically controlled valve 11 is opened and Pamin is reduced by 0.2 KPa every 10 minutes.

[0103] If P3 does not decrease but P1 increases within 30 minutes, the fourth electrically controlled valve 11 is kept closed and Pamin is reduced by 0.1 KPa every 10 minutes.

[0104] If P3 and P2 decrease within 30 minutes, the first electrically controlled valve 18 and the fourth electrically controlled valve 11 are closed.

[0105] If P3 decreases but P2 does not decrease within 30 minutes, the fourth electrically controlled valve 11 is kept closed and Pamin is increased by 0.1 KPa every 10 minutes.

[0106] (3) When the fourth electrically controlled valve 11 is opened, if P3 continues to increase or remains at the maximum value, the first electrically controlled valve 18 and the third electrically controlled valve 20 are opened.

[0107] In some embodiments of the present invention, reference Figure 3 The controller 500 includes a memory 520 and a processor 510, wherein the memory 520 stores a machine executable program 410. When the machine executable program 410 is executed by the processor 510, the machine executable program 410 controls the opening and closing of the first electrically controlled valve 18, the second electrically controlled valve 22, the third electrically controlled valve 20, and the fourth electrically controlled valve 11; the memory 520 stores data monitored by the first pressure sensor 15, the second pressure sensor 6, the third pressure sensor 9, the fourth pressure sensor 5, and the temperature sensor. After the processor 510 compares the data stored in the memory 520 with the corresponding data in the preset conditions, it controls the opening and closing of the first electrically controlled valve 18, the second electrically controlled valve 22, the third electrically controlled valve 20, and the fourth electrically controlled valve 11. The processing process is performed by executing the machine executable program 410.

[0108] The present invention also provides an LNG filling station, such as Figure 1 As shown, the LNG filling station includes: a storage tank 100, configured to store and transport LNG; a liquid charging machine 200, configured to transport the LNG; and a submersible pump skid device 300 as described in any of the above embodiments, which is connected between the storage tank 100 and the liquid charging machine 200.

[0109] In this embodiment, the storage tank 100 transports the LNG stored therein to the submersible pump skid device 300 through an input pipeline. The submersible pump skid device 300 transports the LNG to the liquid filling machine 200 through the submersible pump 2 or 4 set in the main pump pool 1 or the backup pump pool 3. The liquid filling machine 200 is used to fill the liquid filling vehicle with liquid to complete the entire liquid filling process.

[0110] At this point, those skilled in the art will recognize that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications consistent with the principles of the present invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. A submersible pump skid device for an LNG filling station, characterized in that: include: Main pump pool, used to store and transport LNG; a temporary storage tank, used to store the gasified LNG in the main pump pool and connected to a first pressure sensor; a standby pump pool, configured to store vaporized LNG and / or store and deliver LNG, so as to receive vaporized LNG in the temporary storage tank when the pressure monitored by the first pressure sensor exceeds a first threshold value of the temporary storage tank; a reversing valve, connecting the main pump pool and the backup pump pool, to control one of the main pump pool and the backup pump pool to be connected to the liquid adding circuit, and to cut off the connection between the other and the liquid adding circuit; The standby pump pool is connected to a second pressure sensor for obtaining a pressure value in the standby pump pool; The second pressure sensor and the first pressure sensor are further connected to a controller, and the controller is configured to: Acquiring a first pressure value in the temporary storage tank via the first pressure sensor, and acquiring a second pressure value in the backup pump pool via the second pressure sensor; In response to the first pressure value exceeding a first threshold, charging the vaporized LNG from the temporary storage tank into the backup pump pool; In response to the first pressure value increasing or remaining unchanged, it is determined whether the second pressure value decreases, and if so, it is determined that the backup pump pool is leaking.

2. The submersible pump skid device according to claim 1, characterized in that: The liquid adding circuit includes an input pipeline and an output pipeline; the reversing valve includes an inlet and three outlets, the inlet of the reversing valve is connected to the input pipeline; the first outlet of the reversing valve is connected to the main pump tank, the second outlet of the reversing valve is connected to the standby pump tank, and the third outlet of the reversing valve is connected to the output pipeline; The inlet of the reversing valve is connected to one of the outlets of the reversing valve and is cut off from the communication with the other two outlets of the reversing valve.

3. The submersible pump skid device according to claim 1, characterized in that: The temporary storage tank is connected to the backup pump pool via the first electrically controlled valve and the second electrically controlled valve in sequence; the temporary storage tank is connected to the main pump pool via the first electrically controlled valve and the third electrically controlled valve in sequence; the second electrically controlled valve and the third electrically controlled valve are each connected in series with the first electrically controlled valve, and the second electrically controlled valve and the third electrically controlled valve are arranged in parallel.

4. The submersible pump skid device according to claim 3, characterized in that: The controller is also connected to the first electrically controlled valve, the second electrically controlled valve, and the third electrically controlled valve, and is configured as follows: In response to the first pressure value exceeding the first threshold and the second pressure value being less than a second threshold, controlling the first electrically controlled valve and the second electrically controlled valve to be open and the third electrically controlled valve to be closed; In response to the first pressure value not exceeding the first threshold, the second electrically controlled valve is controlled to close.

5. The submersible pump skid device according to claim 4, characterized in that: In response to the second pressure value reaching a second threshold, the controller controls the second electrically controlled valve to close so that the backup pump pool maintains a stable pressure state.

6. The submersible pump skid device according to claim 4, characterized in that: In response to the backup pump pool being connected to the liquid adding circuit via the reversing valve, the controller controls the first electrically controlled valve and the third electrically controlled valve to be closed, and the second electrically controlled valve to be opened.

7. The submersible pump skid device according to claim 1, characterized in that: The standby pump pool is connected to the first inlet of the two-way safety valve via a first valve, and the standby pump pool is connected to the second inlet of the two-way safety valve via a second valve; In response to the second pressure value exceeding a third threshold value after the backup pump pool is connected to the liquid adding circuit via the reversing valve, the two-way safety valve opens to release the gasified LNG in the backup pump pool.

8. The submersible pump skid device according to claim 1, characterized in that: The main pump pool is connected to the temporary storage tank via the third valve and the first one-way valve in sequence, so that the gasified LNG in the main pump pool flows into the temporary storage tank.

9. An LNG filling station, characterized in that: include: a storage tank configured to store and deliver LNG; a liquid dispenser configured to deliver the LNG; The submersible pump skid device according to any one of claims 1 to 8, which is connected between the storage tank and the liquid charging machine.

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