CN112460469A - Pressurization system and pressurization method for vehicle-mounted LNG receiving platform - Google Patents
Pressurization system and pressurization method for vehicle-mounted LNG receiving platform Download PDFInfo
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- CN112460469A CN112460469A CN202011434483.8A CN202011434483A CN112460469A CN 112460469 A CN112460469 A CN 112460469A CN 202011434483 A CN202011434483 A CN 202011434483A CN 112460469 A CN112460469 A CN 112460469A
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- Prior art keywords
- lng
- bog
- receiving platform
- storage tank
- pressurization
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C3/00—Vessels not under pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/032—Hydrocarbons
- F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a pressurization system for a vehicle-mounted LNG (liquefied Natural gas) receiving platform, which comprises the LNG receiving platform, an LNG tank wagon and an LNG storage tank, wherein the LNG storage tank is respectively connected with the LNG receiving platform, the LNG tank wagon, a BOG storage tank and a BOG compressor, the LNG receiving platform is connected with the LNG tank wagon, the BOG compressor is connected with the BOG storage tank, and the BOG storage tank is respectively connected with the LNG tank wagon. The pressurization system solves the problems of low receiving efficiency and poor environmental adaptability of the conventional LNG receiving system.
Description
Technical Field
The invention belongs to the technical field of liquefied natural gas receiving, and particularly relates to a pressurization system of a vehicle LNG receiving platform.
Background
Liquefied natural gas (LNG for short) is a widely used clean energy and has the characteristics of high heat value, high efficiency and small pollution. The LNG liquefaction device and the storage receiving station are both provided with a loading and receiving system and corresponding facilities, and the LNG receiving system and the facilities in the inner land area are both used for receiving by adopting an air temperature vaporizer gasification and a tank car self-pressurization mode.
The self-pressurization receiving process of the air-temperature gasifier is complex in flow, more in flange interfaces, required to be purged and replaced before running each time and low in precooling rate. Each precooling needs to be controlled to be about 10-40 minutes, the supercharging effect is not ideal, and the efficiency is often influenced by the slow speed of increasing the pressure of the tank car; particularly in the north, the air temperature is low in winter, the tank car gas phase pressure can be maintained to be received when the air temperature type gasifier just starts to operate, then the tank car gas phase pressure needs to be stopped for a while or another receiving pry needs to be replaced for continuous receiving, if rain and snow weather occurs in winter, the air temperature type gasifier can be frozen, the heat exchange effect and the self-pressurization rate of the gasifier are obviously reduced, the LNG tank car gas phase pressure is influenced, the receiving device is basically difficult to operate, and the receiving rate is obviously reduced when the receiving time of LNG of one tank car exceeds 6 hours.
In addition, a plurality of receiving prying systems are required to be arranged on the same receiving scale, so that process facilities such as equipment and pipelines are added, the project investment is high, the occupied area is large, the land resource utilization rate is low, and meanwhile, the leakage risk of the flange pipe orifice of the receiving device is increased to a certain extent. Therefore, LNG is received by utilizing the modes of air temperature gasifier gasification and tank car self-pressurization, the environment adaptability is poor, the operation flow is complex, the operation time consumption is long, the occupied area is large, the investment is high, and the enterprise operation benefit is influenced.
Disclosure of Invention
The invention aims to provide a pressurization system of a vehicle-mounted LNG receiving platform, which solves the problems of low receiving efficiency and poor environmental adaptability of the conventional LNG receiving system.
The second purpose of the invention is to provide a pressurization method for the vehicle-carried LNG receiving platform, which is simple and requires short time.
The technical scheme includes that the pressurization system of the vehicle-mounted LNG receiving platform comprises the LNG receiving platform, an LNG tank wagon and an LNG storage tank, wherein the LNG storage tank is respectively connected with the LNG receiving platform, an LNG tank, a BOG storage tank and a BOG compressor, the LNG receiving platform is connected with the LNG tank wagon, the BOG compressor is connected with the BOG storage tank, and the BOG storage tank is respectively connected with the LNG tank wagon.
The present invention is also characterized in that,
a first pressure regulating valve is arranged between the LNG storage tank and the BOG storage tank.
And a second pressure regulating valve is arranged between the first pressure regulating valve and the BOG storage tank.
An SDV cut-off valve is arranged between the second pressure regulating valve and the LNG tank wagon.
And a pressure gauge is arranged between the SDV cut-off valve and the LNG tank wagon and close to the LNG tank wagon.
The BOG compressor adopts a low-temperature reciprocating compressor.
The second technical scheme adopted by the invention is that the pressurization method for the vehicle-mounted LNG receiving platform comprises the following specific processes: the BOG storage tank is opened, a BOG compressor and an SDV cut-off valve are opened, BOG in the LNG storage tank is recycled and pressurized to 0.4-0.6 MPa through the BOG compressor, the BOG after pressurization is conveyed to the BOG storage tank to be stored, the BOG in the BOG storage tank is conveyed to an LNG tank wagon to be pressurized, in the BOG conveying process, a second pressure regulating valve is opened to regulate the pressure to 0.4-0.6 MPa, after pressurization of the LNG tank wagon is completed, the second pressure regulating valve is closed, a first pressure regulating valve is opened, redundant BOG is recycled, an unloading pump on an LNG receiving platform is started to complete LNG receiving.
The present invention is also characterized in that,
and if the pressure in the LNG tank wagon exceeds 0.7MPa, closing the SDV cut-off valve to protect the LNG tank wagon.
The invention has the beneficial effects that:
(1) according to the pressurization system for the vehicle-mounted LNG receiving platform, the BOG compressed gas in the LNG storage tank is used as the pressurization gas for the vehicle-mounted LNG receiving platform to replace an air-temperature gasifier, so that the pressurization is rapid, the pressure is stable, the number of connectors is small, and the system is safer;
(2) the pressurization system of the vehicle-mounted LNG receiving platform can reduce the BOG emptying of an LNG storage tank, is environment-friendly, and can recycle BOG gas used for pressurization after LNG receiving is finished;
(3) the pressurization system for the vehicle-mounted LNG receiving platform can pressurize a plurality of LNG tank cars simultaneously, completely replaces an air-temperature vaporizer, and is low in equipment facility cost;
(4) the pressurization method for the vehicle-mounted LNG receiving platform is simple, safe and reliable.
Drawings
Fig. 1 is a schematic structural diagram of a pressurization system of a vehicle-mounted LNG receiving platform according to the present invention;
fig. 2 is a pressurization flow chart of a pressurization system of a vehicle-mounted LNG receiving platform according to the present invention;
in the figure, the LNG receiving platform is 1, the LNG tank wagon is 2, the LNG storage tank is 3, the BOG storage tank is 4, the BOG compressor is 5, the first pressure regulating valve is 6, the second pressure regulating valve is 7, and the SDV stop valve is 8.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a pressurization system for a vehicle-mounted LNG receiving platform, which comprises an LNG receiving platform 1, an LNG tank wagon 2 and an LNG storage tank 3, wherein the LNG storage tank 3 is respectively connected with the LNG receiving platform 1, the LNG tank wagon 2, a BOG storage tank 4 and a BOG compressor 5, the LNG receiving platform 1 is connected with the LNG tank wagon 2, the BOG compressor 5 is connected with the BOG storage tank 4, the BOG storage tank 4 is respectively connected with the LNG tank wagon 2, a first pressure regulating valve 6 is arranged between the LNG storage tank 3 and the BOG storage tank 4, a second pressure regulating valve 7 is arranged between the first pressure regulating valve 6 and the BOG storage tank 4, an SDV cut-off valve 8 is arranged between the second pressure regulating valve 7 and the LNG tank wagon 2, a pressure gauge is arranged between the SDV cut-off valve 8 and the LNG tank wagon 2 and close to the LNG tank wagon 2 and used for monitoring pressure change in a transmission process, and the LNG tank wagon 2 has a certain influence on the pressure because the low temperature, the second pressure regulating, the first pressure regulating valve 6, the second pressure regulating valve 7 and the SDV cut-off valve 8 are connected in parallel, the first pressure regulating valve 6, the second pressure regulating valve 7, the SDV cut-off valve 8 and the pressure gauge are connected with the control system, and the control system controls the opening and closing of the first pressure regulating valve 6, the second pressure regulating valve 7 and the SDV cut-off valve 8 and monitors the pressure change in the pressure gauge.
The BOG compressor 5 employs a low-temperature reciprocating compressor.
The invention relates to a vehicle-mounted LNG receiving platform pressurization method, which comprises the following specific processes: the BOG storage tank is characterized in that a BOG compressor 5 and an SDV cut-off valve 8 are opened, BOG in an LNG storage tank 3 is recycled and pressurized to 0.4-0.6 MPa through the BOG compressor 5, the pressurized BOG is conveyed to the BOG storage tank 4 to be stored, the BOG in the BOG storage tank 4 is conveyed to an LNG tank wagon 2 to be pressurized, in the BOG conveying process, a second pressure regulating valve 7 is opened to regulate the pressure to 0.4-0.6 MPa, after the pressurization of the LNG tank wagon 2 is completed, the second pressure regulating valve 7 is closed, a first pressure regulating valve 6 is opened to recycle redundant BOG, an unloading pump on an LNG receiving platform 1 is started to complete LNG receiving, and if the pressure in the LNG tank wagon 2 exceeds 0.7MPa, the SDV cut-off valve 8 is closed to protect the LNG tank wagon 2.
Claims (8)
1. The utility model provides a car fortune LNG receiving platform turbocharging system, includes LNG receiving platform (1), LNG tank wagon (2), LNG storage tank (3), its characterized in that, LNG storage tank (3) are connected with LNG receiving platform (1), LNG tank wagon (2), BOG storage tank (4), BOG compressor (5) respectively, LNG receiving platform (1) is connected with LNG tank wagon (2), BOG compressor (5) are connected with BOG storage tank (4), BOG storage tank (4) are connected with LNG tank wagon (2) respectively.
2. A vehicle LNG receiving platform pressurisation system according to claim 1, characterised in that a first pressure regulating valve (6) is arranged between the LNG storage tank (3) and the BOG storage tank (4).
3. A vehicle LNG receiving platform pressurisation system according to claim 2, characterised in that a second pressure regulating valve (7) is provided between the first pressure regulating valve (6) and the BOG storage tank (4).
4. A vehicle LNG receiving platform pressurisation system according to claim 3, characterised in that an SDV shut-off valve (8) is provided between the second pressure regulating valve (7) and the LNG tanker (2).
5. A vehicle LNG receiving platform pressurisation system according to claim 4, characterised in that a pressure gauge is provided between the SDV shut-off valve (8) and the LNG tanker (2) and close to the LNG tanker (2).
6. The vehicle LNG receiving platform pressurization system according to claim 1, wherein the BOG compressor (5) employs a cryogenic reciprocating compressor.
7. A vehicle LNG receiving platform pressurization method is characterized in that the vehicle LNG receiving platform pressurization system according to any one of claims 1 to 6 is adopted, and the specific process is as follows: the method comprises the steps of starting a BOG compressor (5) and an SDV cut-off valve (8), recovering and pressurizing BOG in an LNG storage tank (3) to 0.4-0.6 MPa through the BOG compressor (5), conveying the pressurized BOG to the BOG storage tank (4) for storage, conveying the BOG in the BOG storage tank (4) to an LNG tank wagon (2) for pressurization, opening a second pressure regulating valve (7) to regulate the pressure to 0.4-0.6 MPa in the BOG conveying process, closing the second pressure regulating valve (7) after the pressurization of the LNG tank wagon (2) is completed, opening a first pressure regulating valve (6), recovering redundant BOG, and starting an unloading pump on an LNG receiving platform (1) to complete LNG receiving.
8. The method of claim 7, wherein if the pressure in the LNG tanker (2) exceeds 0.7MPa, the SDV shut-off valve (8) is closed to protect the LNG tanker (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011434483.8A CN112460469A (en) | 2020-12-10 | 2020-12-10 | Pressurization system and pressurization method for vehicle-mounted LNG receiving platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011434483.8A CN112460469A (en) | 2020-12-10 | 2020-12-10 | Pressurization system and pressurization method for vehicle-mounted LNG receiving platform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112460469A true CN112460469A (en) | 2021-03-09 |
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ID=74800429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011434483.8A Pending CN112460469A (en) | 2020-12-10 | 2020-12-10 | Pressurization system and pressurization method for vehicle-mounted LNG receiving platform |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112460469A (en) |
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2020
- 2020-12-10 CN CN202011434483.8A patent/CN112460469A/en active Pending
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