CN216591045U

CN216591045U - LNG vaporization station central gas supply system

Info

Publication number: CN216591045U
Application number: CN202122442950.8U
Authority: CN
Inventors: 叶忠健
Original assignee: Yichang Medium Combustion City Gas Development Co ltd
Current assignee: Yichang Medium Combustion City Gas Development Co ltd
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2022-05-24
Anticipated expiration: 2031-10-11

Abstract

LNG vaporizing station centralized gas supply system, including storage jar, liquid nitrogen storage tank and BOG reheater, the storage jar is equipped with outward and presss from both sides the cover, and BOG reheater includes the water seal jar, is equipped with coiled pipe and bubbler in the water seal jar, steam pipe intercommunication bubbler, and water seal jar intercommunication water pipe still includes pressure boost system, pressure regulating measurement system and the control system of unloading, the pressure boost system of unloading installs quick-operation joint, first stop valve, first pressure sensor and first immersed pump including the first pipeline of intercommunication storage jar on the first pipeline, and the liquid nitrogen storage tank passes through the second pipeline and presss from both sides the cover intercommunication, installs the second immersed pump on the second pipeline, installs the third stop valve on the steam pipe, installs the fourth stop valve on the water pipe. The system can automatically monitor and control each device and valve of the LNG filling station, and reduces potential safety hazards.

Description

LNG vaporization station central gas supply system

Technical Field

The utility model relates to a centralized gas supply system of an LNG vaporization station.

Background

LNG (Liquefied Natural Gas) is mainly composed of methane, is cryogenically cooled to-162 ℃ at normal pressure, is changed from a gaseous state to a liquid state, is called Liquefied Natural Gas, has the volume about 1/600 of the volume of the same amount of gaseous Natural Gas and the weight of about 45% of the same volume of water, is clean energy for replacing diesel oil, and the construction of LNG filling stations is accelerated in the process. However, most of control operations of the existing LNG filling station need to be completed manually, so that the problems of potential safety hazards, responsibility consciousness and the like are more prominent.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a centralized gas supply system of an LNG vaporization station, which can automatically monitor and control all devices and valves of the LNG vaporization station and reduce potential safety hazards.

In order to solve the problems, the technical scheme of the utility model is as follows:

LNG vaporizing station centralized gas supply system, including storage jar, liquid nitrogen storage tank and BOG reheater, the storage jar is equipped with outward and presss from both sides the cover, and BOG reheater includes the water seal jar, is equipped with coiled pipe and bubbler in the water seal jar, steam pipe intercommunication bubbler, water seal jar intercommunication water pipe, still includes unloading turbocharging system, pressure regulating measurement system and control system, the pressure regulating turbocharging system of unloading includes the first pipeline of intercommunication storage jar, installs quick-operation joint, first stop valve, first pressure sensor and first immersed pump on the first pipeline, and the liquid nitrogen storage tank passes through the second pipeline and presss from both sides the cover intercommunication, installs the second immersed pump on the second pipeline, and the pressure regulating measurement system passes through third pipeline and storage jar intercommunication, and BOG reheater intercommunication is on the third pipeline, installs the third immersed pump on the third pipeline, pressure regulating measurement system is including the odorizing device of intercommunication on the third pipeline, The control system controls the unloading pressurization system, the pressure regulating metering system and the BOG reheater, a third stop valve is installed on the steam pipe, and a fourth stop valve is installed on the tap water pipe.

The third pipeline is communicated with the top of the storage tank through a fourth pipeline, and a fourth immersed pump is installed on the fourth pipeline.

The control system comprises a first pressure sensor and a first temperature sensor which are arranged on the storage tank, a second temperature sensor and a second pressure sensor which are arranged on a third pipeline, a third temperature sensor which is arranged on the water-sealed tank, a first liquid level sensor which is arranged on the storage tank, a second liquid level sensor which is arranged on the water-sealed tank and a methane concentration detector which is arranged on the spot, the first temperature sensor, the second temperature sensor, the third temperature sensor, the first pressure sensor, the second pressure sensor, the first liquid level sensor, the second liquid level sensor, the methane concentration detector and the flow meter are connected with the input end of the PLC, the output end of the PLC is connected with a first stop valve, a second stop valve, a third stop valve, a fourth stop valve, a first immersed pump, a second immersed pump, a third immersed pump, a fourth immersed pump and a PID valve.

The PLC controller is in communication connection with a computer, and the computer is in wireless communication with the mobile client 4.

The utility model has the beneficial effects that: storage jar, liquid nitrogen storage tank, BOG reheater's liquid level, data such as temperature and pressure can be gathered to control system through LNG station, and data transfer gives the computer, show and save data by the computer, and each stop valve of automatic control and immersed pump are controlled the natural gas, can monitor each data long-rangely simultaneously, realize the function of equipment automation operation and remote data control, can realize unmanned on duty's ability, degree of automation and information is high, high operation convenience, safety and reliability.

Drawings

The utility model is further described below with reference to the accompanying drawings:

figure 1 is a schematic structural view of the present invention,

fig. 2 is a block diagram of the present invention.

In the figure: the system comprises a first stop valve 1, a first pipeline 2, a first pressure sensor 3, a methane concentration detector 4, a jacket 5, a storage tank 6, a third pressure sensor 7, a first liquid level sensor 8, a water seal tank 9, a coiled pipe 10, a second temperature sensor 11, a flow meter 12, a PID valve 13, an odorizing device 14, a second pressure sensor 15, a fourth stop valve 16, a tap water pipe 17, a third stop valve 18, a third temperature sensor 20, a third pipeline 21, a third immersed pump 22, a fourth immersed pump 23, a second pipeline 25, a second immersed pump 26, a liquid nitrogen storage tank 27, a first temperature sensor 29 and a first immersed pump 30.

Detailed Description

As shown in fig. 1 and 2, the centralized gas supply system of the LNG vaporization station comprises a storage tank 6, a liquid nitrogen storage tank 27 and a BOG reheater, wherein the storage tank 6 is a primary tank and a secondary tank, a jacket 5 is arranged outside the primary tank and the secondary tank, liquid nitrogen is conveyed into the jacket 5 to keep natural heat gas in a low-temperature state in real time, the BOG reheater comprises a water seal tank 9, a coiled pipe 10 and a bubbler are arranged in the water seal tank 9, a steam pipe 19 is communicated with the bubbler, the water seal tank 9 is communicated with a tap water pipe 17, steam is used for bubbling and heating tap water in the water seal tank through the bubbler to heat natural heat of the radial flow coiled pipe 10, so that the natural heat is vaporized to be output at normal temperature, the centralized gas supply system further comprises an unloading pressurization system, a pressure regulating and a control system, the unloading pressurization system comprises a first pipeline 2 communicated with the storage tank 6, a quick joint, a first stop valve 1, a first pressure sensor 3 and a first submerged pump 30 are arranged on the first pipeline 2, the quick connector is communicated with the LNG dumper through a hose, the first stop valve 1, a second stop valve, a third stop valve 18 and a fourth stop valve 16 which are described below are all pneumatic control stop valves, a one-way valve is arranged on one side of the first stop valve 1 to prevent natural gas from overflowing, the first stop valve 1 is a normally open valve, natural gas output by the LNG dumper is sent into the storage tank 6 through a first immersed pump 30, a liquid nitrogen storage tank 27 is communicated with a jacket 5 through a second pipeline 25, the second immersed pump 26 is arranged on the second pipeline 25 and sends the liquid nitrogen into the jacket 5 through the second immersed pump 26 to keep the natural gas in the storage tank 6 at a low temperature, the pressure regulating and metering system is communicated with the storage tank 6 through a third pipeline 21, one end of the third pipeline 21 is communicated with a user pipe network, the BOG reheater is communicated with the third pipeline 21, the third immersed pump 22 is arranged on the third pipeline 21, and the pressure regulating and metering system comprises an odorizing device 14, a third stop valve 14 and a fourth stop valve 16 which are communicated with the third pipeline 21, PID valve 13, flowmeter 12 and second stop valve through the valve aperture of control PID valve 13 to adjust the pressure that the natural gas delivery pipe sent into the user pipe network, control system control pressure boost system, pressure regulating measurement system and BOG reheater of unloading installs third stop valve 18 on steam pipe 19, installs fourth stop valve 16 on water pipe 17.

The third pipe 21 communicates with the top of the storage tank 6 through a fourth pipe on which a fourth immersed pump 23 is mounted. The fourth immersed pump 23 is used for pressurizing the natural gas in the third pipeline 21.

The control system comprises a first pressure sensor 3 and a first temperature sensor 29 which are arranged on a storage tank 6, a second temperature sensor 11 and a second pressure sensor 15 which are arranged on a third pipeline 21, a third temperature sensor 20 which is arranged on a water-sealed tank 9, a first liquid level sensor 8 which is arranged on the storage tank 6, a second liquid level sensor which is arranged on the water-sealed tank 9 and a methane concentration detector 4 which is arranged on the site, wherein the first temperature sensor 29, the second temperature sensor 11, the third temperature sensor 20, the first pressure sensor 3, the second pressure sensor 15, the first liquid level sensor 8, the second liquid level sensor, the methane concentration detector 4 and a flow meter 12 are connected with the input end of a PLC controller, and the output end of the PLC controller is connected with a first stop valve 1, a second stop valve, a third stop valve 18, a fourth stop valve 16, a first immersed pump 30, A second immersed pump 26, a third immersed pump 22, a fourth immersed pump 23 and a PID valve 13.

The PLC controller is in communication connection with the computer, the computer is in wireless communication with the mobile client, the computer wirelessly transmits data to the mobile client, and the mobile client is a mobile phone.

The first pressure sensor 3 and the first temperature sensor 29 are used for detecting the pressure and the temperature of the storage tank 6, and the PLC controls the second immersed pump 26 to send liquid nitrogen in the liquid nitrogen storage tank 27 into the jacket 5 by detecting the pressure and the temperature data of the storage tank 6, so as to adjust the temperature and the pressure of natural gas in the storage tank 6 and maintain the natural gas in a set range; when the first liquid level sensor 8 detects that the liquid level in the storage tank 6 reaches a high liquid level, the storage tank 6 is full, the controller controls the first stop valve 1 to be closed, a worker is informed to disconnect the LNG dumper through the mobile client to stop air supply, the PLC controls the liquid level of the water-sealed tank 9 according to the liquid level detected by the second liquid level sensor and controls the fourth stop valve 16 to maintain the liquid level of the water-sealed tank 9 within a set range, the PLC controls the water temperature in the water-sealed tank 9 according to the third temperature sensor 20 and controls the amount of steam entering the water-sealed tank 9 through the third stop valve 18 to maintain the water temperature in the water-sealed tank 9 within the set range; the second temperature sensor 11 and the second pressure sensor 15 are used for monitoring the pressure and temperature of natural gas in a transmission user pipe network, the PLC controls the PID valve 13 according to detected natural gas pressure data in the third pipeline 21 so as to output the natural gas at a set pressure, the second temperature sensor 11 feeds the detected output temperature of the natural gas back to the controller, and the controller controls the steam start and stop so as to control the output temperature of the natural gas and ensure that the natural gas is output at a normal temperature; when the methane concentration detector 4 detects that the on-site methane exceeds the standard, the information is transmitted to the staff and processed by the staff.

Claims

The LNG vaporization station centralized gas supply system comprises a storage tank (6), a liquid nitrogen storage tank (27) and a BOG reheater, wherein a jacket (5) is arranged outside the storage tank (6), the BOG reheater comprises a water seal tank (9), a coiled pipe (10) and a bubbler are arranged in the water seal tank (9), a steam pipe (19) is communicated with the bubbler, the water seal tank (9) is communicated with a tap water pipe (17), and the LNG vaporization station centralized gas supply system is characterized in that: still including the pressure boost system that unloads, pressure regulating measurement system and control system, the pressure boost system that unloads is including first pipeline (2) of intercommunication storage jar (6), install quick-operation joint, first stop valve (1), first pressure sensor (3) and first immersed pump (30) on first pipeline (2), liquid nitrogen storage tank (27) are through second pipeline (25) and jacket (5) intercommunication, install second immersed pump (26) on second pipeline (25), the pressure regulating measurement system is through third pipeline (21) and storage jar (6) intercommunication, BOG reheater intercommunication is on third pipeline (21), install third immersed pump (22) on third pipeline (21), the pressure regulating measurement system is including communicateing odorizing device (14), PID valve (13) and flowmeter (12) on third pipeline (21), control system control pressure boost system that unloads, the pressure boost system, The pressure regulating and metering system and the BOG reheater are characterized in that a third stop valve (18) is installed on a steam pipe (19), and a fourth stop valve (16) is installed on a tap water pipe (17).
2. The LNG vaporization station centralized gas supply system of claim 1, wherein: the third pipeline (21) is communicated with the top of the storage tank (6) through a fourth pipeline, and a fourth immersed pump (23) is installed on the fourth pipeline.
3. An LNG vaporization station centralized gas supply system as recited in claim 2, wherein: the control system comprises a first pressure sensor (3) and a first temperature sensor (29) which are installed on a storage tank (6), a second temperature sensor (11) and a second pressure sensor (15) which are installed on a third pipeline (21), a third temperature sensor (20) which is installed on a water-sealed tank (9), a first liquid level sensor (8) which is installed on the storage tank (6), a second liquid level sensor which is installed on the water-sealed tank (9) and a methane concentration detector (4) which is arranged on site, the first temperature sensor (29), the second temperature sensor (11), the third temperature sensor (20), the first pressure sensor (3), the second pressure sensor (15), the first liquid level sensor (8), the second liquid level sensor, the methane concentration detector (4) and a flowmeter (12) are connected with the input end of a PLC controller, and the output end of the PLC controller is connected with a first stop valve (1), The device comprises a second stop valve, a third stop valve (18), a fourth stop valve (16), a first immersed pump (30), a second immersed pump (26), a third immersed pump (22), a fourth immersed pump (23) and a PID valve (13).
4. An LNG vaporization station centralized gas supply system as recited in claim 2, wherein: the PLC controller is in communication connection with a computer, and the computer is in wireless communication with the mobile client.