Skid-mounted LNG (Liquefied Natural Gas) gasification pressure regulating metering output device

Abstract

The utility model discloses a skid-mounted LNG (Liquefied Natural Gas) gasification pressure-regulating metering output device which comprises a skid-mounted frame, two groups of LNG storage tanks are fixedly mounted in the skid-mounted frame, a first three-way pipe is communicated and mounted between the two groups of LNG storage tanks, valves are arranged on the outer surfaces of two branch pipes of the first three-way pipe, and a second three-way pipe is communicated and mounted at the other ends of the two groups of LNG storage tanks; the outer surfaces of two branch pipes of the second three-way pipe are communicated with pressure reducing valves, one end of the second three-way pipe is communicated with a metering output mechanism, and the other end of the metering output mechanism is communicated with two sets of circulating pumps. Through the design of the metering output mechanism, the output quantity of the LNG can be monitored in real time in the LNG output process, it is ensured that the output quantity of the LNG accurately reaches a preset value, the situation that the output quantity of the LNG is excessive or insufficient can be avoided, and therefore the operation accuracy and efficiency are improved, a signal can be automatically sent to the controller, and the operation efficiency is improved. The controller controls the electromagnetic valve to be closed according to the signal, and automatic cut-off is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas gasification output, in particular to a skid-mounted LNG gasification pressure regulating metering output device. Background Technique

[0002] An LNG gasification pressure regulating metering output device refers to a device used to convert liquefied natural gas (LNG) into gaseous natural gas and perform pressure regulation and metering output on the gaseous natural gas.

[0003] For example, the patent with the national authorized patent publication number CN218543634U discloses a modular LNG gasification pressure regulating metering device, including a first base, a second base, a mounting seat, and a pressure regulating metering body arranged on the mounting seat. The first base and the second base are set as hollow structures. The inner cavity of the first base is provided with a first lead screw and first guide rods on both sides of the first lead screw. The bottom end of the second base is provided with a first guide block meshing with the first lead screw, and the first guide block is provided with a first guide hole for the first guide rod to pass through. The inner cavity of the second base is provided with a second lead screw perpendicular to the first lead screw and second guide rods on both sides of the second lead screw. Through the second guide block driving the mounting seat to move along the second lead screw, the present utility model can adjust the mounting seat in the front-back direction, and thus can adjust the pressure regulating metering body in the front-back direction and the left-right direction, further improving the applicability of the adjustment of the mounting position of the pressure regulating metering body.

[0004] However, for the above-mentioned modular LNG gasification pressure regulating metering device, during the process of LNG output, it cannot perform real-time detection on the output pressure of LNG and regulate it to the preset pressure range for output. As a result, the system pressure may be too high or too low, which will increase safety risks such as explosion and leakage, pose a potential threat to equipment and personnel, and does not have the function of quantitative output during the process of LNG output, which may lead to excessive or insufficient discharge of LNG. Content of the Utility Model

[0005] The purpose of the present utility model is to provide a skid-mounted LNG gasification pressure regulating metering output device to solve the problem that during the process of LNG output, it cannot perform real-time detection on the output pressure of LNG as mentioned in the above background technique.

[0006] To achieve the above purpose, the present utility model provides the following technical solutions:

[0007] Skid-mounted LNG vaporization, pressure regulation, metering and output device, comprising: a skid-mounted frame, two groups of LNG storage tanks are fixedly installed inside the skid-mounted frame, a first three-way pipe is connected and installed between the two groups of LNG storage tanks, valves are arranged on the outer surfaces of the two branch pipes of the first three-way pipe, the other ends of the two groups of LNG storage tanks are connected and installed with a second three-way pipe, pressure reducing valves are connected and installed on the outer surfaces of the two branch pipes of the second three-way pipe, one end of the second three-way pipe is connected and installed with a metering and output mechanism, the other end of the metering and output mechanism is connected and installed with two groups of circulation pumps, and a third three-way pipe is connected and installed between the discharge ports of the two groups of circulation pumps.

[0008] Preferably, support plates are fixedly installed on the lower surfaces of the two groups of circulation pumps, and the circulation pumps are fixedly installed inside the skid-mounted frame through the support plates.

[0009] Preferably, pressure gauges are connected and installed on the outer surfaces of the two branch pipes of the second three-way pipe, and the pressure gauges are located at the rear ends of the pressure reducing valves.

[0010] Preferably, the metering and output mechanism includes a solenoid valve, the solenoid valve is connected and installed at one end of the second three-way pipe, one end of the solenoid valve is connected and installed with an ultrasonic flowmeter, one end of the ultrasonic flowmeter is connected and installed with a fourth three-way pipe, and the fourth three-way pipe is connected and installed with the intake ports of the two groups of circulation pumps.

[0011] Preferably, the signal transmitting end of the ultrasonic flowmeter is connected to the signal receiving end of the PID controller, and the control output end of the PID controller is electrically connected to the electric control end of the solenoid valve.

[0012] Preferably, stop valves are connected and installed on the outer surfaces of the two branch pipes of the fourth three-way pipe connected and installed with the intake ports of the two groups of circulation pumps.

[0013] Compared with the prior art, the beneficial effects of the present utility model are:

[0014] 1. Through the design of LNG storage tank, first three-way pipe, second three-way pipe, pressure reducing valve, metering output mechanism and circulating pump, when in use, the first three-way pipe of LNG storage tank can be connected and installed with external gasifier, and the gasifier can convert liquid LNG into gas and supply it into LNG storage tank through the first three-way pipe for storage. After the storage is completed, the skid-mounted rack can be pulled by a truck to the gas user for output. During the output process, the delivery flow and pressure value of the LNG storage tank can be adjusted by connecting and installing with the third three-way pipe and twisting the pressure reducing valve to ensure that the pressure in the target system is within a controllable range, while avoiding equipment overload, ensuring that no accidents will occur during the delivery and use of LNG, and ensuring the safety and stability of the system. Then the metering output mechanism can be started and the LNG output volume can be set, and the metering After the output mechanism is opened, the two sets of circulation pumps will start together. The main function of the circulation pump is to maintain the flow of LNG in the system, ensure that LNG can flow smoothly from the LNG storage tank to the gas user, maintain the stable flow of LNG in the pipeline, and be able to increase the pressure of LNG, which is especially important for long-distance transportation or gas use environments that require higher pressures. By increasing the pressure of LNG, it can be ensured that LNG can effectively reach the destination even in long-distance transportation or high-demand situations. This is especially useful when the vehicle cannot reach the destination and is still far away from the destination. In conjunction with the metering output mechanism, the circulation pump can help accurately control the output of LNG. The LNG delivery rate can also be adjusted by adjusting the number of circulation pumps opened, thereby achieving accurate metering and control of the output to meet the needs of different gas users.

[0015] 2. Through the design of the solenoid valve and the ultrasonic flowmeter, during the LNG output process, LNG will pass through the second three-way pipe in turn through the solenoid valve and the ultrasonic flowmeter to monitor the LNG output in real time. When the ultrasonic flowmeter detects that the LNG output has reached the set LNG volume, it will send a signal to the controller, and the controller will control the solenoid valve through the electronic control end to cut off the second three-way pipe, thereby achieving real-time monitoring of the LNG output and ensuring that the output LNG volume accurately reaches the preset value, avoiding excessive or insufficient situations, thereby improving the accuracy and efficiency of the operation, and being able to automatically send a signal to the controller, and the controller controls the solenoid valve to close according to the signal to achieve automatic cutoff. This automated control method reduces the need for manual operation and the risk of operating errors, while also improving the response speed of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of a circulation pump of the utility model;

[0018] Figure 3 Schematic structural diagram of the metering output mechanism of the present utility model.

[0019] In the figure: 1, skid-mounted frame; 101, LNG storage tank; 102, first three-way pipe; 103, pressure gauge; 104, pressure reducing valve; 105, second three-way pipe; 2, metering output mechanism; 201, ultrasonic flowmeter; 202, solenoid valve; 203, fourth three-way pipe; 204, stop valve; 3, circulation pump; 301, third three-way pipe; 302, support plate. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] Please refer to Figures 1 - 3 , the present utility model provides a technical solution:

[0022] As Figures 1 - 2 shown, the skid-mounted LNG gasification pressure regulation metering output device includes: a skid-mounted frame 1, two groups of LNG storage tanks 101 are fixedly installed in the skid-mounted frame 1, a first three-way pipe 102 is connected and installed between the two groups of LNG storage tanks 101, valves are arranged on the outer surfaces of the two branch pipes of the first three-way pipe 102, the other ends of the two groups of LNG storage tanks 101 are connected and installed with a second three-way pipe 105, a pressure reducing valve 104 is connected and installed on the outer surfaces of the two branch pipes of the second three-way pipe 105, one end of the second three-way pipe 105 is connected and installed with a metering output mechanism 2, the other end of the metering output mechanism 2 is connected and installed with two groups of circulation pumps 3, and a third three-way pipe 301 is connected and installed between the discharge ports of the two groups of circulation pumps 3.

[0023] Support plates 302 are fixedly installed on the lower surfaces of the two groups of circulation pumps 3, and the circulation pumps 3 are fixedly installed in the skid-mounted frame 1 through the support plates 302.

[0024] Pressure gauges 103 are connected and installed on the outer surfaces of the two branch pipes of the second three-way pipe 105, and the pressure gauges 103 are located at the rear ends of the pressure reducing valves 104.

[0025] Through the design of the LNG storage tank 101, the first three-way pipe 102, the second three-way pipe 105, the pressure reducing valve 104, the metering output mechanism 2 and the circulating pump 3, when in use, the first three-way pipe 102 of the LNG storage tank 101 can be connected and installed with the external gasifier, and the gasifier can convert the liquid LNG into gas and supply it into the LNG storage tank 101 through the first three-way pipe 102 for storage. After the storage is completed, the skid-mounted rack 1 can be pulled by a truck to the gas user for output. During the output process, the delivery flow and pressure value of the LNG storage tank 101 can be adjusted by connecting and installing it with the third three-way pipe 301 and twisting the pressure reducing valve 104 to ensure that the pressure in the target system is within a controllable range, while avoiding equipment overload, ensuring that no accidents will occur during the delivery and use of LNG, ensuring the safety and stability of the system, and then the metering output mechanism 2 can be started. And set the LNG output volume, and after the metering output mechanism 2 is opened, the two sets of circulation pumps 3 will start together. The main function of the circulation pump 3 is to maintain the flow of LNG in the system, ensure that LNG can flow smoothly from the LNG storage tank 101 to the gas user, maintain the stable flow of LNG in the pipeline, and be able to increase the pressure of LNG, which is particularly important for long-distance transportation or gas use environments that require higher pressures. By increasing the pressure of LNG, it can be ensured that LNG can effectively reach the destination even in long-distance transportation or high-demand situations, which is particularly useful when the vehicle cannot reach the destination and is still far away from the destination. In conjunction with the metering output mechanism 2, the circulation pump 3 can help accurately control the output volume of LNG, and can also adjust the number of circulation pumps 3 opened to adjust the LNG delivery rate, thereby achieving accurate metering and control of the output volume to meet the needs of different gas users.

[0026] like Figure 3 As shown, the metering output mechanism 2 includes a solenoid valve 202, which is connected and installed at one end of the second three-way pipe 105, and an ultrasonic flowmeter 201 is connected and installed at one end of the solenoid valve 202, and a fourth three-way pipe 203 is connected and installed at one end of the ultrasonic flowmeter 201, and the fourth three-way pipe 203 is connected and installed with the air inlets of the two groups of circulation pumps 3.

[0027] The signal transmitting end of the ultrasonic flow meter 201 is connected to the signal receiving end of the PID controller, and the control output end of the PID controller is electrically connected to the electric control end of the solenoid valve 202 .

[0028] The outer surfaces of the two branch pipes of the fourth three-way pipe 203 connected to the air inlets of the two groups of circulation pumps 3 are both connected to the stop valves 204.

[0029] Through the design of the solenoid valve 202 and the ultrasonic flowmeter 201, during the LNG output process, LNG will pass through the second three-way pipe 105 in turn through the solenoid valve 202 and the ultrasonic flowmeter 201 to monitor the LNG output in real time. When the ultrasonic flowmeter 201 detects that the LNG output has reached the set LNG volume, it will send a signal to the controller, and the controller will control the solenoid valve 202 through the electronic control end to cut off the second three-way pipe 105, thereby achieving real-time monitoring of the LNG output and ensuring that the output LNG volume accurately reaches the preset value, thereby avoiding excessive or insufficient situations, thereby improving the accuracy and efficiency of the operation, and being able to automatically send a signal to the controller, and the controller controls the solenoid valve 202 to close according to the signal to achieve automatic cutoff. This automated control method reduces the need for manual operation and the risk of operational errors, while also improving the response speed of the system.

[0030] The working steps of this scheme are summarized and sorted out according to the above technical scheme: when in use, the first three-way pipe 102 of the LNG storage tank 101 can be connected and installed with the external gasifier, and the gasifier can convert the liquid LNG into gas and supply it into the LNG storage tank 101 through the first three-way pipe 102 for storage. After the storage is completed, the skid-mounted rack 1 can be pulled by a truck to the gas user for output. During the output process, it can be connected and installed with the third three-way pipe 301, and the pressure reducing valve 104 can be twisted to adjust the delivery flow and pressure value of the LNG storage tank 101 to ensure that the pressure in the target system is within a controllable range, while avoiding equipment overload, ensuring that no accidents occur during the transportation and use of LNG, and ensuring the safety and stability of the system. Subsequently, the LNG output volume can be set by the controller and the solenoid valve 202 can be opened, so that when the LNG enters the second three-way pipe 105, the solenoid valve 202 and the ultrasonic flowmeter 201 can be used to monitor the LNG output volume in real time, and At the same time, the number of circulating pumps 3 to be opened can be selected according to the required LNG delivery rate, and the closed group of circulating pumps 3 can close the adjacent stop valve 204, and the LNG is only supplied to the third three-way pipe 301 through one group of circulating pumps 3. The main function of the circulating pump 3 is to maintain the flow of LNG in the system, ensure that LNG can flow smoothly from the LNG storage tank 101 to the gas user, maintain the stable flow of LNG in the pipeline, and be able to increase the pressure of LNG, which is particularly important for long-distance transportation or gas use environments that require higher pressure. By increasing the pressure of LNG, it can be ensured that LNG can effectively reach the destination even in long-distance transportation or high-demand situations. This is particularly useful for vehicles that cannot reach the destination and are still far away from the destination. When the ultrasonic flowmeter 201 detects that the LNG output has reached the set LNG amount, it will send a signal to the controller, and the controller will control the solenoid valve 202 through the electronic control end to cut off the second three-way pipe 105.

[0031] In summary, during the process of outputting LNG, it can monitor the output volume of LNG in real time, ensure that the output volume of LNG accurately reaches the preset value, avoid the occurrence of over - quantity or under - quantity situations, thereby improving the accuracy and efficiency of operation, and can automatically send a signal to the controller. The controller then controls the solenoid valve 202 to close according to the signal to achieve automatic cut - off. This automatic control method reduces the need for manual operation, reduces the risk of operation errors, and also improves the response speed of the system.

[0032] Parts not involved in the present utility model are the same as or can be implemented by using the prior art. Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. Skid-mounted LNG vaporization, pressure regulation, metering and output device, characterized in that, Including: A skid-mounted frame (1), inside which two LNG storage tanks (101) are fixedly installed. A first three-way pipe (102) is installed in communication between the two LNG storage tanks (101). Valves are arranged on the outer surfaces of the two branch pipes of the first three-way pipe (102). The other ends of the two LNG storage tanks (101) are connected and installed with a second three-way pipe (105). Pressure reducing valves (104) are connected and installed on the outer surfaces of the two branch pipes of the second three-way pipe (105). One end of the second three-way pipe (105) is connected and installed with a metering and output mechanism (2). The other end of the metering and output mechanism (2) is connected and installed with two circulation pumps (3). A third three-way pipe (301) is installed in communication between the discharge ports of the two circulation pumps (3).

2. The skid-mounted LNG vaporization, pressure regulation, metering and output device according to claim 1, wherein: Support plates (302) are fixedly installed on the lower surfaces of the two circulation pumps (3). The circulation pumps (3) are fixedly installed in the skid-mounted frame (1) through the support plates (302).

3. The skid-mounted LNG vaporization, pressure regulation, metering and output device according to claim 1, characterized in that: Pressure gauges (103) are connected and installed on the outer surfaces of the two branch pipes of the second three-way pipe (105). The pressure gauges (103) are located at the rear ends of the pressure reducing valves (104).

4. The skid-mounted LNG vaporization, pressure regulation, metering and output device according to claim 1, wherein: The metering and output mechanism (2) includes a solenoid valve (202). The solenoid valve (202) is connected and installed at one end of the second three-way pipe (105). One end of the solenoid valve (202) is connected and installed with an ultrasonic flowmeter (201). One end of the ultrasonic flowmeter (201) is connected and installed with a fourth three-way pipe (203). The fourth three-way pipe (203) is connected and installed with the air inlets of the two circulation pumps (3).

5. The skid-mounted LNG vaporization pressure regulation metering output device according to claim 4, wherein: The signal transmitting end of the ultrasonic flowmeter (201) is connected to the signal receiving end of a PID controller. The control output end of the PID controller is electrically connected to the electric control end of the solenoid valve (202).

6. The skid-mounted LNG vaporization pressure regulating metering and output device according to claim 4, characterized in that: Stop valves (204) are connected and installed on the outer surfaces of the two branch pipes of the fourth three-way pipe (203) connected and installed with the air inlets of the two circulation pumps (3).

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