An efficient LNG refueling station unloading system

Abstract

This utility model belongs to the field of unloading operation technology, specifically disclosing an efficient LNG refueling station unloading system, including a top liquid inlet assembly, a bottom liquid inlet assembly, and a switching assembly. The switching assembly connects the bottom liquid inlet assembly and the top liquid inlet assembly. The top liquid inlet assembly is connected to the top liquid inlet of the storage tank, and the bottom liquid inlet assembly is connected to the bottom liquid inlet of the storage tank. The switching assembly is used to switch the connection state between the bottom liquid inlet assembly and the top liquid inlet assembly. By rationally controlling the use of the storage tank interface for unloading operations and vehicle refueling, interference and influence between the two functions operating simultaneously are avoided. Furthermore, by switching the connection state between the bottom liquid inlet assembly and the top liquid inlet assembly, unloading efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of unloading operation technology, and in particular relates to an LNG refueling station unloading system that improves efficiency. Background Technology

[0002] In China, LNG refueling stations are typically designed so that the bottom and top inlets of the storage tank serve as both unloading and refueling ports. In practice, due to the shared nature of these ports, unloading and vehicle refueling may occur simultaneously. However, the unloading operation may be temporarily disabled due to the refueling function occupying the bottom and top inlets, resulting in low unloading efficiency. Utility Model Content

[0003] The purpose of this invention is to provide an efficient LNG refueling station unloading system to solve the problem that in the prior art, the unloading operation is temporarily disabled due to the liquid filling function occupying the bottom and top liquid inlets, resulting in low unloading efficiency.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: an efficient LNG refueling station unloading system, comprising a top liquid inlet assembly, a bottom liquid inlet assembly, and a switching assembly, wherein the switching assembly is used to connect the bottom liquid inlet assembly and the top liquid inlet assembly; the top liquid inlet assembly is connected to the top liquid inlet of the storage tank, and the bottom liquid inlet assembly is connected to the bottom liquid inlet of the storage tank; the switching assembly is used to switch the connection state between the bottom liquid inlet assembly and the top liquid inlet assembly.

[0005] Furthermore, the top inlet assembly includes a top pipe and a top control valve; the bottom inlet assembly includes a bottom pipe and a bottom control valve; the switching assembly includes a switching pipe and a switching control valve; the switching assembly is located on the side of the bottom control valve and the top control valve away from the storage tank; the switching pipe is connected to the bottom pipe and the top pipe respectively.

[0006] Furthermore, the top control valve, bottom control valve, and switching control valve are electric valves or pneumatic valves.

[0007] Furthermore, a first shut-off valve and a second shut-off valve are respectively provided on the top pipe and the bottom pipe.

[0008] Furthermore, the bottom control valve, top control valve, and switching control valve are all connected to the control system.

[0009] Furthermore, a pressure detection sensor is installed inside the storage tank, and the pressure detection sensor is connected to the control system.

[0010] The working principle of this technical solution is as follows:

[0011] 1. Separate Unloading Operation: The control system uses pressure sensors to detect tank pressure and switches valves accordingly. If the tank pressure is higher than a first set value, the top control valve remains open, while the bottom control valve and switching control valve remain closed, allowing LNG from the tanker truck to continuously unload into the tank from the top, simultaneously depressurizing the tank. When the tank pressure is lower than a second set value, the bottom control valve and switching control valve open, while the top control valve closes, allowing LNG from the tanker truck to continuously unload into the tank from the bottom, increasing the unloading speed. The system switches repeatedly.

[0012] 2. Individual Filling Operation: The control system monitors the filling operation process. Upon receiving a filling command, the control system uses the pressure sensor to determine the tank pressure. If the pressure exceeds the third set value, the bottom control valve opens, while the top control valve and switching control valve close to prevent the tank pressure from continuously increasing. If the pressure falls below the fourth set value, the top control valve and switching control valve open, while the bottom control valve closes, increasing the tank pressure.

[0013] 3. Simultaneous operation of two tasks: When the control system receives both unloading and refueling commands simultaneously, it opens the bottom and top control valves while closing the switching control valve, ensuring that the two tasks can be performed simultaneously without interference. When one task stops, the other task proceeds according to a separate workflow.

[0014] The beneficial effects of this technical solution are as follows: By rationally controlling the use of the tank interface during unloading operations and vehicle refueling, this solution avoids mutual interference and influence when the two functions operate simultaneously. Furthermore, by switching the connection status between the bottom and top refueling components, unloading efficiency is improved. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an LNG refueling station unloading system for improving efficiency, according to this utility model. Detailed Implementation

[0016] The following detailed description illustrates the specific implementation method:

[0017] The reference numerals in the accompanying drawings include: storage tank 1, top pipe 2, bottom pipe 3, switching pipe 4, top control valve 5, bottom control valve 6, switching control valve 7, first shut-off valve 8, and second shut-off valve 9.

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] The basic implementation examples are as follows: Figure 1 As shown: An efficient LNG refueling station unloading system includes a top liquid inlet assembly, a bottom liquid inlet assembly, and a switching assembly. The switching assembly is used to connect the bottom liquid inlet assembly and the top liquid inlet assembly. The top liquid inlet assembly is connected to the top liquid inlet of storage tank 1, and the bottom liquid inlet assembly is connected to the bottom liquid inlet of storage tank 1. The switching assembly is used to switch the connection state between the bottom liquid inlet assembly and the top liquid inlet assembly.

[0020] The top inlet assembly includes a top pipe 2 and a top control valve 5; the bottom inlet assembly includes a bottom pipe 3 and a bottom control valve 6; the switching assembly includes a switching pipe 4 and a switching control valve 7. The switching assembly is located on the side of the bottom control valve 6 and the top control valve 5 furthest from the storage tank 1. The switching pipe 4 is connected to the bottom pipe 3 and the top pipe 2, respectively. The top control valve 5, the bottom control valve 6, and the switching control valve 7 are electric or pneumatic valves. A first shut-off valve 8 and a second shut-off valve 9 are respectively installed on the top pipe 2 and the bottom pipe 3. A pressure detection sensor is installed inside the storage tank 1. The pressure detection sensor, the bottom control valve 6, the top control valve 5, and the switching control valve 7 are all connected to the control system, which also receives external work commands. The control system has corresponding first, second, third, and fourth setpoints for unloading and refueling operations. When the corresponding operation is performed, the pressure detection signal transmitted by the pressure detection sensor is compared with the setpoint for the corresponding operation, and corresponding control is performed based on the comparison result.

[0021] The specific implementation process is as follows:

[0022] 1. Separate Unloading Operation: The control system uses the pressure detection signal from the pressure sensor to determine the pressure of storage tank 1 and switches valves accordingly. If the pressure of storage tank 1 is detected to be higher than the first set value, the top control valve 5 remains open, while the bottom control valve 6 and the switching control valve 7 are closed. LNG from the tanker truck is continuously unloaded into storage tank 1 from the top, simultaneously depressurizing storage tank 1. When the pressure of storage tank 1 is detected to be lower than the second set value, the bottom control valve 6 and the switching control valve 7 are opened, while the top control valve 5 is closed. LNG from the tanker truck is continuously unloaded into storage tank 1 from the bottom, increasing the unloading speed. The system switching process repeats continuously.

[0023] 2. Individual Filling Operation: The control system monitors the filling operation process. Upon receiving a filling operation command, the control system determines the pressure of tank 1 using the detection signal from the pressure sensor. If the pressure of tank 1 is detected to be higher than the third set value, the bottom control valve 6 is opened, and the top control valve 5 and the switching control valve 7 are closed to prevent the pressure of tank 1 from continuously increasing. If the pressure of tank 1 is detected to be lower than the fourth set value, the top control valve 5 and the switching control valve 7 are opened, while the bottom control valve 6 is closed, increasing the pressure of tank 1.

[0024] 3. Simultaneous operation of two tasks: When the control system receives both unloading and refueling commands simultaneously, it opens the bottom control valve 6 and the top control valve 5, while simultaneously closing the switching control valve 7, ensuring that the two tasks can be performed simultaneously without interference. When one task stops, the other task proceeds according to a separate operation procedure.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An efficient LNG refueling station unloading system, characterized in that: It includes a top liquid inlet assembly, a bottom liquid inlet assembly, and a switching assembly. The switching assembly is used to connect the bottom liquid inlet assembly and the top liquid inlet assembly. The top liquid inlet assembly is connected to the top liquid inlet of the storage tank (1), and the bottom liquid inlet assembly is connected to the bottom liquid inlet of the storage tank (1). The switching assembly is used to switch the connection state between the bottom liquid inlet assembly and the top liquid inlet assembly.

2. The LNG refueling station unloading system with improved efficiency according to claim 1, characterized in that: The top inlet assembly includes a top pipe (2) and a top control valve (5); the bottom inlet assembly includes a bottom pipe (3) and a bottom control valve (6); the switching assembly includes a switching pipe (4) and a switching control valve (7); the switching assembly is located on the side of the bottom control valve (6) and the top control valve (5) away from the storage tank (1); the switching pipe (4) is connected to the bottom pipe (3) and the top pipe (2) respectively.

3. The LNG refueling station unloading system for improved efficiency according to claim 2, characterized in that: The top control valve (5), bottom control valve (6), and switching control valve (7) are electric or pneumatic valves.

4. The LNG refueling station unloading system with improved efficiency according to claim 2, characterized in that: The top pipe (2) and the bottom pipe (3) are respectively equipped with a first shut-off valve (8) and a second shut-off valve (9).

5. The LNG refueling station unloading system for improved efficiency according to claim 2, characterized in that: The bottom control valve (6), top control valve (5), and switching control valve (7) are all connected to the control system.

6. The LNG refueling station unloading system for improved efficiency according to claim 5, characterized in that: The storage tank (1) is equipped with a pressure detection sensor, which is connected to the control system.

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