Liquefied natural gas drainage device

Abstract

The utility model discloses a liquefied natural gas drainage device, which belongs to the technical field of natural gas drainage, and is characterized in that the upper end and the lower end of an intermediate tank are provided with connecting ports and are connected with a hydraulic natural gas pipeline through the lower end connecting port, the intermediate tank is connected with a drainage pipeline through the upper end connecting port, and the top of the drainage pipeline is provided with an exhaust valve; gas in the liquid discharging pipeline is discharged through the exhaust valve; and a first liquid discharge pipe and a second liquid discharge pipe are sequentially arranged on the side wall of the liquid discharge pipeline from bottom to top. The automatic exhaust electric control valve automatically controls gas exhaust, so that the system pressure is prevented from being too high, and the safety is improved. The two electric control valves are included, remote operation and control are supported, the operation efficiency and convenience are improved, and meanwhile the manual operation risk is reduced. In order to ensure the sealing performance, all joints are sealed by welding and sealing rings. And the two liquid discharge pipes are designed on the liquid discharge pipeline, so that smooth discharge is ensured. The valves are arranged on the same vertical line, installation and operation are convenient, and maintenance and use of the system are simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to natural gas liquid discharge technology field especially relates to a liquefied natural gas liquid discharge device. BACKGROUND

[0002] Liquefied natural gas liquid discharge device is a kind of equipment for handling the liquid accumulation generated in the storage and transportation process of liquefied natural gas (LNG). In the storage and transportation process of LNG, condensation may occur on the inner wall of the container due to temperature and pressure changes, resulting in liquid accumulation. The role of liquid discharge device is to periodically or continuously discharge these accumulated liquids to ensure the stability of the pressure and temperature inside the container and avoid container overpressure or overheating.

[0003] Liquid discharge device usually includes one or more liquid discharge valves, which can be automatic or manual, and they are connected to the bottom or sidewall of the container. In the automatic liquid discharge system, there is usually a temperature or pressure sensor to monitor the conditions inside the container, and when the preset threshold is reached, the system will automatically open the valve to discharge. Manual system needs operators to manually open the valve according to needs.

[0004] The design and selection of liquid discharge device need to consider multiple factors, including LNG flow, container size and shape, operating temperature and pressure, etc. In order to ensure safety and efficiency, these devices usually need to meet specific safety standards and specifications.

[0005] The current liquefied natural gas liquid discharge device has some shortcomings in actual use. First, the single-pipe liquid discharge efficiency is slow, which directly affects the efficiency of the device. The slow discharge speed may lead to a decrease in the processing capacity of the entire system, affecting the entire liquefied natural gas production or supply process. Second, there is still gaseous natural gas inside the liquid discharge device, which not only affects the smoothness of the discharge process, but also may pose a safety hazard. The presence of gaseous natural gas may lead to incomplete discharge, increase internal system pressure, and even in some cases cause leakage or explosion risk. Therefore, improving the efficiency of the liquid discharge device and ensuring that there is no gaseous natural gas residue inside is the key to improving the processing capacity of liquefied natural gas. SUMMARY

[0006] The main purpose of the utility model is to provide a liquefied natural gas liquid discharge device, which can effectively solve the problems raised in the background art.

[0007] To achieve the above purpose, the technical scheme adopted by the utility model is:

[0008] The utility model provides a liquefied natural gas drainage device, including intermediate tank and connecting port, the upper and lower end of intermediate tank is equipped with the connecting port, and is connected with hydraulic natural gas pipeline through the lower end connecting port, is connected with drainage pipeline through the upper end connecting port of intermediate tank, the top of drainage pipeline is equipped with exhaust valve, and the gas in drainage pipeline is discharged through exhaust valve,

[0009] The side wall of the drainage pipeline is sequentially provided with a first drainage pipe and a second drainage pipe from bottom to top, a pipe opening of the first drainage pipe is provided with a first valve, and a first collecting pipeline is connected to the first valve, a pipe opening of the second drainage pipe is provided with a second valve, and a second collecting pipeline is connected to the second valve, and the intermediate tank overflows liquid into the drainage pipeline, and the liquid is discharged through the first drainage pipe and the second drainage pipe.

[0010] As a further preferred embodiment of the present application, the first valve and the second valve are located on the same vertical line, and the side walls of the first valve and the second valve are provided with mounting seats to realize assembly of the two valves.

[0011] As a further preferred embodiment of the present application, the first drainage pipe and the second drainage pipe are each composed of two bent pipes, the two bent pipes are respectively welded and fixed on the drainage pipeline, the other ends of the two bent pipes are combined to form a circular pipe, and the first drainage pipe, the second drainage pipe and the drainage pipeline are sealingly arranged.

[0012] As a further preferred embodiment of the present application, the connecting port is welded and fixed to the intermediate tank, and the connecting port and the intermediate tank are sealingly arranged, the port of the connecting port is provided with a connecting flange, the upper end connecting port is connected to the drainage pipeline through the connecting flange, and a sealing ring is arranged between the two.

[0013] As a further preferred embodiment of the present application, a butt joint pipe is arranged between the drainage pipeline and the exhaust valve, the butt joint pipe is sealingly connected to the drainage pipeline and the exhaust valve, and the exhaust valve is an automatic exhaust electric control valve.

[0014] As a further preferred embodiment of the present application, the liquid and the gas in the intermediate tank are respectively discharged from the drainage pipe and the exhaust valve, and the first valve and the second valve are both electric control valves.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The automatic exhaust electric control valve is an advanced device that can automatically control the exhaust of gas, effectively preventing the problem of excessive system pressure caused by gas accumulation, thereby significantly improving the safety of the entire system. The design of this electric control valve includes a first valve and a second valve, both of which are electrically controlled valves that can be remotely operated and controlled through an electronic control system. This remote operation and control function makes it possible to automate the drainage process, improving efficiency and convenience. By remotely operating the valves through an electronic control system, it not only facilitates routine inspection and maintenance of the equipment, but also significantly reduces the need for manual operation and the risks that may arise.

[0017] To ensure the sealing during the drainage process and prevent possible leakage problems, all connections are carefully designed with welding and sealing rings for sealing, ensuring the safety of the operation. The side wall of the drainage pipe is provided with a first drainage pipe and a second drainage pipe from bottom to top, which ensures smooth drainage of the liquid and prevents blockage or overflow due to improper pipe design. In addition, the first valve and the second valve are designed to be located on the same vertical line, which not only facilitates installation, but also simplifies the operation process, making the maintenance and use of the entire system more intuitive and convenient. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0019] Figure 2 is a side view of the overall structure of the present utility model;

[0020] Figure 3 is a display diagram of the drainage pipe, drainage pipe, valve and collection pipe of the present utility model;

[0021] Figure 4 is a schematic diagram of the drainage pipe, valve and collection pipe of the present utility model.

[0022] In the figure: 1, intermediate tank; 2, connection port; 3, drainage pipe; 4, exhaust valve; 5, first drainage pipe; 6, second drainage pipe; 7, mounting seat; 8, first valve; 9, first collection pipe; 10, second valve; 11, second collection pipe. DETAILED DESCRIPTION

[0023] To make the technical means, creative features, purposes and effects achieved by the present utility model easy to understand, the following will further elaborate the present utility model in combination with specific implementation manners.

[0024] As Figure 1 - Figure 4As shown, a liquefied natural gas drainage device includes an intermediate tank 1 and at least one connecting port 2. The intermediate tank 1 is provided with connecting ports 2 at both the upper and lower ends, wherein the connecting port 2 at the lower end is used to connect with a liquefied natural gas pipeline, and the connecting port 2 at the upper end is used to connect with a drainage pipeline 3. The top of the drainage pipeline 3 is provided with an exhaust valve 4, which is used to discharge the gas inside the drainage pipeline 3.

[0025] The side wall of the drainage pipeline 3 is sequentially provided with a first drainage pipe 5 and a second drainage pipe 6 from the bottom upwards. The first drainage pipe 5 is provided with a first valve 8 at the pipe opening, which is connected with a drainage system through a first collection pipeline 9. Similarly, the second drainage pipe 6 is also provided with a second valve 10 at the pipe opening, which is connected with the drainage system through a second collection pipeline 11. When the liquid in the intermediate tank 1 overflows, the liquid will flow into the drainage pipeline 3 and be discharged through the first drainage pipe 5 and the second drainage pipe 6.

[0026] The first valve 8 and the second valve 10 are designed to be on the same vertical line to facilitate installation and operation. The side walls of the two valves are provided with mounting seats 7 to realize the assembly and fixation of the two valves.

[0027] In order to ensure the smoothness and sealing of the drainage, the first drainage pipe 5 and the second drainage pipe 6 are both composed of two bent pipes, which are welded and fixed on the drainage pipeline 3. The other ends of the two bent pipes are combined into a circular pipe to ensure the good sealing between the first drainage pipe 5, the second drainage pipe 6 and the drainage pipeline 3.

[0028] The connecting port 2 and the intermediate tank 1 are fixedly connected by welding and are sealingly arranged therebetween. The connecting port 2 is provided with a connecting flange at the port, so that the upper connecting port 2 can be connected with the drainage pipeline 3 through the connecting flange, and a sealing ring is arranged between the connecting flange and the drainage pipeline 3 to ensure the sealing of the connection.

[0029] In order to further ensure the safety of the drainage process, a butt joint pipe is installed between the drainage pipeline 3 and the exhaust valve 4, which is sealingly connected between the drainage pipeline 3 and the exhaust valve 4. The exhaust valve 4 is designed as an automatic exhaust electric control valve, which can automatically control the discharge of gas.

[0030] In the liquefied natural gas drainage device, the liquid and gas inside the intermediate tank 1 are discharged through the drainage pipe and the exhaust valve 4, respectively. In addition, the first valve 8 and the second valve 10 are both designed as electric control valves to facilitate remote operation and control through an electronic control system.

[0031] Installation process: Place the intermediate tank 1 in the designated location. Ensure that both the upper and lower ends of the intermediate tank 1 are equipped with connection ports 2, and secure the connection by welding. Connect the top of the drainage pipeline 3 to the upper end connection port 2 of the intermediate tank 1. Use connection flanges and sealing rings to ensure the sealing of the connection. Install the exhaust valve 4 on the top of the drainage pipeline 3, ensuring a sealed connection between it and the drainage pipeline 3. Install the first drainage pipe 5 and the second drainage pipe 6 successively from the bottom of the side wall of the drainage pipeline 3. Ensure that the first valve 8 and the second valve 10 are installed at the pipe openings of the two drainage pipes, respectively. Connect the first valve 8 to the drainage system through the first collection pipeline 9, and connect the second valve 10 to the drainage system through the second collection pipeline 11. Install the mounting seat 7 on the side wall of the first valve 8 and the second valve 10 to achieve the assembly and fixation of the two valves. Ensure that the first valve 8 and the second valve 10 are on the same vertical line to facilitate installation and operation. Weld the elbow portions of the first drainage pipe 5 and the second drainage pipe 6 to the drainage pipeline 3. Ensure that the other ends of the two elbows merge into a circular pipe to achieve good sealing between the drainage pipeline 3. Check all connections for leaks. Perform pressure testing to verify the sealing and safety of the system.

[0032] In use: Ensure that the liquefied natural gas pipeline is connected to the lower end connection port 2 of the intermediate tank 1. Open the valve of the liquefied natural gas pipeline to allow the liquid to enter the intermediate tank 1. Monitor the liquid level in the intermediate tank 1 to ensure it does not exceed the safety range. When the gas in the intermediate tank 1 accumulates, the exhaust valve 4 will automatically open to discharge the gas, ensuring the safety of the system. When the liquid in the intermediate tank 1 overflows, the liquid will flow into the drainage pipeline 3. Open the first valve 8 and the second valve 10 through the electronic control system to discharge the liquid. Adjust the opening of the valves as needed to control the drainage rate. Remote operation of the first valve 8 and the second valve 10 through the electronic control system achieves automatic liquid discharge. Regularly check the operating status and sealing of the equipment to ensure normal operation of the system. Clean and maintain the valves and drainage pipeline 3 to prevent clogging and leakage.

[0033] The utility model relates to an automatic exhaust electric control valve, its main function is through the control means of automation to manage the exhaust process of gas, thereby effectively avoid the security problem that may be caused because of the system internal pressure is too high, has improved the overall security of system obviously. The electric control valve is composed of two electric control valves, these two valves not only support remote operation, but also can carry out remote control, the design improves the efficiency and convenience of operation, reduces the risk that brings because of manual operation improper obviously. In order to ensure that the sealing performance of whole system reaches best, all possible connecting parts adopt the welding technology and sealing ring to carry out sealing treatment. In addition, the drain pipeline part designs two drain pipes, such design can ensure that liquid can smoothly drain, avoids the possibility of blockage. On the layout of valve, the designer arranges them on the same perpendicular line, such design not only facilitates installation, also facilitates operation, greatly simplifies the maintenance work of system and the use process of user,

[0034] The above is the preferred embodiment of the utility model and the technical principle used, for the person skilled in the art, without departing from the spirit and scope of the utility model, any equivalent transformation, simple replacement etc. obvious change based on the utility model technical scheme, all belong to the protection scope of the utility model.

Claims

1. A liquefied natural gas liquid drain apparatus, characterized by: The utility model relates to a liquid discharge pipeline of intermediate tank, including intermediate tank (1) and connecting mouth (2), the upper and lower end of intermediate tank (1) is equipped with connecting mouth (2), and is connected with hydraulic natural gas pipeline through lower end connecting mouth (2), and the intermediate tank (1) is connected with the liquid discharge pipeline (3) through upper end connecting mouth (2), the top of liquid discharge pipeline (3) is equipped with exhaust valve (4), and the gas in liquid discharge pipeline (3) is discharged through exhaust valve (4); The side wall of liquid discharge pipeline (3) is equipped with first liquid discharge pipe (5) and second liquid discharge pipe (6) from bottom to top in turn, the pipe orifice of first liquid discharge pipe (5) is equipped with first valve (8), and is connected with first collection pipeline (9) through first valve (8), the pipe orifice of second liquid discharge pipe (6) is equipped with second valve (10), and is connected with second collection pipeline (11) through second valve (10), and the liquid overflow of intermediate tank (1) enters liquid discharge pipeline (3), and realizes the discharge of liquid through first liquid discharge pipe (5) and second liquid discharge pipe (6).

2. The LNG liquid drain device of claim 1, wherein: First valve (8) and second valve (10) are located on the same vertical line, and the side wall of first valve (8) and second valve (10) is equipped with mounting seat (7), so as to realize the assembly of two valves.

3. The LNG liquid drain apparatus according to claim 2, wherein: First liquid discharge pipe (5) and second liquid discharge pipe (6) are both composed of two bent pipes, and the two bent pipes are welded and fixed on liquid discharge pipeline (3), and the other end of the two bent pipes is combined into a circular pipe, and first liquid discharge pipe (5) and second liquid discharge pipe (6) are sealingly arranged between liquid discharge pipeline (3).

4. The LNG liquid drain apparatus according to claim 3, wherein: Connecting mouth (2) is welded and fixed with intermediate tank (1), and is sealingly arranged between connecting mouth (2) and intermediate tank (1), and the port of connecting mouth (2) is provided with a connecting flange, and upper end connecting mouth (2) is connected with liquid discharge pipeline (3) through the connecting flange, and a sealing ring is arranged between the connecting flange and liquid discharge pipeline (3).

5. The LNG liquid drain apparatus according to claim 4, wherein: A butt joint pipe is arranged between liquid discharge pipeline (3) and exhaust valve (4), and the butt joint pipe is sealingly connected with liquid discharge pipeline (3) and exhaust valve (4), and the exhaust valve (4) is an automatic exhaust electric control valve.

6. The LNG liquid drain apparatus according to claim 5, wherein: The liquid and gas in intermediate tank (1) are discharged from liquid discharge pipe and exhaust valve (4) respectively, and first valve (8) and second valve (10) are both electric control valves.

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