CN218936006U

CN218936006U - LNG gasification sled with pressure control system

Info

Publication number: CN218936006U
Application number: CN202223453599.3U
Authority: CN
Inventors: 刘合瑞; 李超; 刘文鑫; 刘合燕
Original assignee: Hebei Tairong Energy Equipment Technology Co ltd
Current assignee: Hebei Tairong Energy Equipment Technology Co ltd
Priority date: 2022-12-24
Filing date: 2022-12-24
Publication date: 2023-04-28
Anticipated expiration: 2032-12-24

Abstract

The utility model discloses an LNG gasifying sled with a pressure control system, which comprises an LNG storage tank, a pressurizing pipeline and a first pipeline, wherein the LNG storage tank is communicated with a supply pipeline, the pressurizing tank is connected with the pressurizing pipeline, the pressurizing pipeline is communicated with the LNG storage tank through the first pipeline, a second stop valve, a low-temperature check valve, a pressure increasing valve, a third stop valve, a pressurizer, a fourth stop valve, a third pressure gauge and a second safety valve are sequentially arranged on the pressurizing pipeline, and a fifth stop valve is arranged on the first pipeline. When the pressure in the LNG storage tank is lower than a preset value, the gas in the pressurizing tank enters the LNG storage tank to be inflated and pressurized, and when the pressure in the LNG storage tank is higher than a Yu Chaoguo second safety valve threshold value, the gas in the LNG storage tank is discharged from the second safety valve; the fifth stop valve and the low-temperature electromagnetic valve are controlled to be opened, and gas in the LNG storage tank can be discharged from the decompression pipeline; the pressurization and depressurization control of the LNG storage tank is realized, and the operation safety of the LNG storage tank is improved.

Description

LNG gasification sled with pressure control system

Technical Field

The utility model relates to the technical field of liquefied natural gas gasification, in particular to an LNG gasification sled with a pressure control system.

Background

Along with sustainable healthy development of economy in China, environmental protection is increasingly important for energy requirements. Natural gas is currently the cleanest energy source available on a large scale on earth. The natural gas source is expected to become a future theme energy source, and three forms are mainly used, namely pipeline natural gas is used, compressed Natural Gas (CNG) is adopted, and Liquefied Natural Gas (LNG) is used. LNG has been developed on a large scale in recent years as an emerging energy source.

The flexible nature of LNG (liquefied natural gas) application has become the best option for urban alternate sources and for industrial large-scale users as well as in remote areas, and has become the primary or transitional sources for the currently unavailable use of piped natural gas to supply cities, as well as the supplemental or peak shaving sources for many use of piped natural gas to supply cities. The liquefied natural gas gasification pressure regulating sled is called LNG gasification sled for short, and is widely popularized as terminal equipment using liquefied natural gas.

The LNG storage tank can safely run only when the pressure is continuously in a preset working pressure range, and the pressure in the LNG storage tank is too high or too low, so that the LNG storage tank and even the whole gasification station can be threatened. Therefore, it is necessary to develop an LNG vaporizing sled that can control the pressure of the LNG tank so as to maintain the pressure of the LNG tank within a predetermined operating pressure range.

The foregoing is not necessarily a prior art, and falls within the technical scope of the inventors.

Disclosure of Invention

In view of the foregoing, it is desirable to provide an LNG vaporizing sled with a pressure control system.

In order to achieve the above purpose, the utility model provides an LNG gasifying sled with a pressure control system, which comprises two LNG storage tanks, wherein liquid outlets of the two LNG storage tanks are communicated with a supply pipeline, low-temperature valves are arranged at the liquid outlets of the LNG storage tanks, and a first stop valve, a first air-temperature gasifier, a first safety valve, a first pressure gauge, a first pressure regulating valve, a second pressure gauge, a second pressure regulating valve and a sixth stop valve are sequentially arranged on the supply pipeline; still include boost tank, boost pipeline and first pipeline, boost tank and boost pipeline connection, the boost pipeline other end is connected with two first pipelines, and two first pipelines communicate with two LNG storage tanks respectively, install second stop valve, low temperature check valve, boost valve, third stop valve, booster, fourth stop valve, third manometer and second relief valve on the boost pipeline in proper order, install the fifth stop valve on the first pipeline.

Preferably, a pressure reducing pipeline is connected to the pressure increasing pipeline and located between the third stop valve and the first pipeline, and a low-temperature electromagnetic valve is installed on the pressure reducing pipeline.

Preferably, a third safety valve is installed on the supply line between the second pressure regulating valve and the sixth shut-off valve.

Preferably, a flowmeter is installed on the supply pipeline and between the second pressure regulating valve and the third safety valve.

Preferably, an odorizing pipeline is connected in parallel on the supply pipeline and between the second pressure regulating valve and the flowmeter, and an odorizing device and a seventh stop valve are arranged on the odorizing pipeline.

Preferably, a filter is installed on the supply line between the first relief valve and the first pressure gauge.

Preferably, a second pipeline is connected in parallel between the LNG storage tank and the first safety valve on the supply pipeline, and a second air temperature type gasifier and an eighth stop valve are arranged on the second pipeline.

Preferably, a secondary heating pipeline is connected in parallel on the supply pipeline and between the first air temperature type gasifier and the first safety valve, and a water bath type heater and a ninth stop valve are arranged on the secondary heating pipeline.

Preferably, a tenth stop valve is installed on the supply line between the first air temperature type gasifier and the first safety valve.

The technical scheme has the beneficial effects that: when the pressure in the LNG storage tank is lower than a preset value, the gas in the pressurizing tank enters the LNG storage tank to be inflated and pressurized, and when the pressure in the LNG storage tank is higher than a Yu Chaoguo second safety valve threshold value, the gas in the LNG storage tank is discharged from the second safety valve; when the pressure in the LNG storage tank needs to be actively reduced, the fifth stop valve and the low-temperature electromagnetic valve are controlled to be opened, and gas in the LNG storage tank is discharged from the pressure reducing pipeline; the pressurization and depressurization control of the LNG storage tank is realized, and the operation safety of the LNG storage tank is improved.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

in the figure, 1, an LNG storage tank; 2. a supply line; 3. a cryogenic valve; 4. a first stop valve; 5. a first air temperature gasifier; 6. a first safety valve; 7. a first pressure gauge; 8. a first pressure regulating valve; 9. a second pressure gauge; 10. a second pressure regulating valve; 11. a sixth shut-off valve; 12. a boost tank; 13. a pressurizing pipeline; 14. a first pipe; 15. a second shut-off valve; 16. a low temperature check valve; 17. a pressure increasing valve; 18. a third stop valve; 19. a supercharger; 20. a fourth shut-off valve; 21. a third pressure gauge; 22. a second safety valve; 23. a fifth shut-off valve; 24. a pressure reducing pipe; 25. a low temperature solenoid valve; 26. a third safety valve; 27. a flow meter; 28. an odorizing pipe; 29. an odorizing device; 30. a seventh stop valve; 31. a filter; 32. a second pipe; 33. a second air temperature gasifier; 34. an eighth shutoff valve; 35. a secondary heating pipe; 36. a water bath type heater; 37. a ninth shut-off valve; 38. and a tenth stop valve.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

Referring to fig. 1, an LNG vaporization sled with a pressure control system is provided in the embodiment of the present application, including two LNG storage tanks 1, liquid outlets of the two LNG storage tanks 1 are all communicated with a supply pipeline 2, low temperature valves 3 are all installed at the liquid outlets of the LNG storage tanks 1, and a first stop valve 4, a first air temperature vaporizer 5, a tenth stop valve 38, a first safety valve 6, a filter 31, a first pressure gauge 7, a first pressure regulating valve 8, a second pressure gauge 9, a second pressure regulating valve 10, a flowmeter 27, a third safety valve 26 and a sixth stop valve 11 are sequentially installed on the supply pipeline 2; the liquefied natural gas storage device further comprises a pressurizing tank 12, a pressurizing pipeline 13 and a first pipeline 14, wherein liquefied natural gas is filled in the pressurizing tank 12, the pressurizing tank 12 is connected with the pressurizing pipeline 13, the other end of the pressurizing pipeline 13 is connected with the two first pipelines 14, the two first pipelines 14 are respectively communicated with the two LNG storage tanks 1, a second stop valve 15, a low-temperature check valve 16, a pressure increasing valve 17, a third stop valve 18, a pressurizing device 19, a fourth stop valve 20, a third pressure gauge 21 and a second safety valve 22 are sequentially installed on the pressurizing pipeline 13, and a fifth stop valve 23 is installed on the first pipeline 14. A pressure reducing pipeline 24 is connected to the pressurizing pipeline 13 and between the third stop valve 18 and the first pipeline 14, and a low-temperature electromagnetic valve 25 is installed on the pressure reducing pipeline 24. An odorizing pipe 28 is connected in parallel with the supply pipe 2 and between the second pressure regulating valve 10 and the flow meter 27, and an odorizing device 29 and a seventh stop valve 30 are installed on the odorizing pipe 28. A second pipeline 32 is connected in parallel to the supply pipeline 2 and between the LNG tank 1 and the first safety valve 6, and a second air temperature gasifier 33 and an eighth stop valve 34 are installed on the second pipeline 32. A secondary heating pipeline 35 is connected in parallel with the supply pipeline 2 and positioned between the first air temperature type gasifier 5 and the first safety valve 6, and a water bath heater 36 and a ninth stop valve 37 are arranged on the secondary heating pipeline 35.

The LNG storage tanks 1 are arranged in two, one of the LNG storage tanks is used as a standby, and the LNG storage tanks are alternately used; the fifth stop valve 23 is normally open, the fourth stop valve 20 is normally closed, and the third pressure gauge 21 detects the pressure in the LNG storage tank 1; when the pressure in the LNG storage tank 1 is lower than a preset value, the second stop valve 15, the third stop valve 18, the booster 19, the fourth stop valve 20 and the fifth stop valve 23 are opened, gas in the booster tank 12 enters the LNG storage tank 1 to be inflated and boosted, and after the pressure value in the LNG storage tank 1 reaches a set value, the boosting is stopped, and the valves such as the second stop valve 15 are closed;

when the pressure in the LNG storage tank 1 exceeds the threshold value of the second safety valve 22, the gas in the LNG storage tank 1 is discharged from the second safety valve 22; when the pressure in the LNG storage tank 1 needs to be reduced, the fifth stop valve 23 and the low-temperature electromagnetic valve 25 are controlled to be opened, and the gas in the LNG storage tank 1 is discharged from the decompression pipeline 24;

when the LNG storage tank 1 is normally supplied, LNG in the LNG storage tank 1 enters a supply pipeline, sequentially passes through the first air-temperature gasifier 5, the filter 31, the first pressure gauge 7, the first pressure regulating valve 8, the second pressure gauge 9 and the second pressure regulating valve 10, is odorized by the odorizing device 29, and then passes through the flowmeter 27 and the third safety valve 26 to be conveyed to a user; the first air temperature type vaporizer 5 vaporizes liquid LNG into a gaseous state; the first pressure regulating valve 8 and the second pressure regulating valve 10 regulate the pressure to about 0.4MPa and output the pressure to a user;

when the ambient temperature is lower, and the temperature of the natural gas at the outlet of the first air temperature type gasifier 5 is lower than 5 ℃, opening a ninth stop valve 37, closing a tenth stop valve 38, and enabling the natural gas gasified by the first air temperature type gasifier 5 to enter a water bath type heater 36 for secondary heating so as to ensure the normal operation of the whole air supply; when the pressure in the supply line 2 is too high, the pressure exceeding the threshold value of the first relief valve 6 is discharged by the first relief valve 6, and the pressure exceeding the threshold value of the third relief valve 26 is discharged by the third relief valve 26, so that the pressure in the supply line 2 is ensured to be normal.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Claims

1. The LNG gasification sled with the pressure control system comprises LNG storage tanks (1), and is characterized in that the number of the LNG storage tanks (1) is two, liquid outlets of the two LNG storage tanks (1) are communicated with a supply pipeline (2), low-temperature valves (3) are arranged at the liquid outlets of the LNG storage tanks (1), and a first stop valve (4), a first air-temperature gasifier (5), a first safety valve (6), a first pressure gauge (7), a first pressure regulating valve (8), a second pressure gauge (9), a second pressure regulating valve (10) and a sixth stop valve (11) are sequentially arranged on the supply pipeline (2); still include boost tank (12), boost pipeline (13) and first pipeline (14), boost tank (12) are connected with boost pipeline (13), and boost pipeline (13) other end is connected with two first pipelines (14), and two first pipelines (14) are respectively with two LNG storage tanks (1) intercommunication, install second stop valve (15), low temperature check valve (16), boost valve (17), third stop valve (18), booster (19), fourth stop valve (20), third manometer (21) and second relief valve (22) on boost pipeline (13) in proper order, install fifth stop valve (23) on first pipeline (14).

2. LNG vaporizing skid with pressure control system according to claim 1, characterized in that a pressure reducing pipe (24) is connected to the pressurizing pipe (13) between the third stop valve (18) and the first pipe (14), and a cryogenic solenoid valve (25) is mounted to the pressure reducing pipe (24).

3. LNG vaporizing skid with pressure control system according to claim 1, characterized in that a third safety valve (26) is installed on the supply line (2) between the second pressure regulating valve (10) and the sixth shut-off valve (11).

4. LNG vaporizing skid with pressure control system according to claim 1, characterized in that a flow meter (27) is mounted on the supply line (2) between the second pressure regulating valve (10) and the third safety valve (26).

5. The LNG vaporizing skid with the pressure control system according to claim 4, wherein an odorizing pipe (28) is connected in parallel between the second pressure regulating valve (10) and the flow meter (27) on the supply pipe (2), and an odorizing device (29) and a seventh stop valve (30) are installed on the odorizing pipe (28).

6. LNG vaporizing skid with pressure control system according to claim 1, characterized in that a filter (31) is mounted on the supply line (2) between the first safety valve (6) and the first pressure gauge (7).

7. The LNG vaporizing skid with the pressure control system according to claim 1, characterized in that a second pipeline (32) is connected in parallel between the LNG storage tank (1) and the first safety valve (6) on the supply pipeline (2), and a second air temperature vaporizer (33) and an eighth stop valve (34) are installed on the second pipeline (32).

8. LNG vaporizing skid with pressure control system according to claim 1, characterized in that a secondary heating pipe (35) is connected in parallel between the first air temperature vaporizer (5) and the first safety valve (6) on the supply pipe (2), and a water bath heater (36) and a ninth shut-off valve (37) are mounted on the secondary heating pipe (35).

9. LNG vaporizing skid with pressure control system according to claim 8, characterized in that a tenth shut-off valve (38) is mounted on the supply line (2) between the first air temperature vaporizer (5) and the first safety valve (6).