Integrated shared LNG unloading system

Abstract

The utility model relates to an integrated shared LNG unloading system, and relates to the technical field of urban gas. The integrated shared LNG unloading system comprises a storage inlet pipe, an unloading supercharger and a BOG pipe, one end of the storage inlet pipe is used for being connected with an LNG tank car, and the other end of the storage inlet pipe is used for being connected with a storage tank; one end of the unloading supercharger is connected with the storage inlet pipe; one end of the BOG pipe is used for being connected with an LNG tank car, and the other end of the BOG pipe is used for being connected with a storage tank. And the other end of the unloading supercharger is connected with the BOG pipe. Three pipelines of an existing unloading system are simplified into two pipelines, namely the storage inlet pipe and the BOG pipeline, liquefied natural gas in the storage inlet pipe is gasified and pressurized through the unloading supercharger and is fed into the LNG tank car again through the BOG pipeline, the gas phase pressure of the LNG tank car is increased, pressure difference is formed between the LNG tank car and the storage tank, and LNG can be fed into the storage tank through the storage inlet pipe. According to the unloading system, the overall unloading efficiency is improved while the unloading system is simplified, and the problem that the unloading efficiency is low due to the fact that an existing unloading process is complex is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of urban gas, in particular to an integrated shared LNG unloading system. Background Art

[0002] LNG (liquefied natural gas) unloading system is widely used in the storage and transportation process of LNG. Its function is to pressurize the LNG in the tank truck and inject it into the LNG storage tank. The existing LNG unloading system mainly consists of three pipelines (LNG liquid phase pipe (into the storage tank), LNG liquid phase pipe (into the unloading vehicle booster), BOG (gasified natural gas) pipe) and unloading booster. Its operation process has the following disadvantages:

[0003] First, the unloading process is complicated, there are many operating interfaces, and the purging, replacement and pre-cooling speeds are slow. Each pre-cooling takes about 20 to 30 minutes. Otherwise, excessive stress is easily generated, causing flange leakage, which in turn leads to low unloading efficiency.

[0004] Second, when the unloading operation is nearing the end, the liquid level in the tank truck decreases, causing the pressure of the pressurized gas phase to decrease, thereby reducing the unloading rate and increasing the unloading time.

[0005] Third, when the unloading scale is large, multiple LNG unloading systems need to be set up, and equipment, pipelines and other process facilities need to be added, resulting in high project investment, large land area, and low land resource utilization rate. At the same time, the risk of leakage at the unloading flange pipe mouth is increased to a certain extent.

[0006] In summary, the existing LNG unloading system has obvious shortcomings, such as poor environmental adaptability, complicated operation process, long operation time and low unloading efficiency.

[0007] With respect to the above-mentioned related technologies, there is a problem that the existing unloading process is complicated, resulting in low unloading efficiency. Utility Model Content

[0008] In view of the above-mentioned deficiencies in the prior art, the purpose of the present utility model is to provide an integrated shared LNG unloading system, aiming to solve the problem of low unloading efficiency caused by the complex unloading process of the existing unloading.

[0009] The present application provides an integrated shared LNG unloading system adopting the following technical solution: an integrated shared LNG unloading system, comprising:

[0010] An inlet pipe, one end of which is used to be connected to the LNG tank truck and the other end of which is used to be connected to the storage tank, and the inlet pipe is used to transport the LNG from the LNG tank truck into the storage tank;

[0011] A truck unloading booster, one end of which is connected to the inlet storage pipe, and the truck unloading booster is used to gasify the LNG;

[0012] BOG pipe, one end is used to connect to the LNG tanker, and the other end is used to connect to the storage tank;

[0013] Wherein, the other end of the unloading supercharger is connected to the BOG pipe.

[0014] Optionally, the unloading supercharger includes an unloading supercharger body, a first connecting pipe and a second connecting pipe;

[0015] One end of the first connecting pipe is connected to the unloading supercharger body, and the other end is connected to the inlet storage pipe;

[0016] One end of the second connecting pipe is connected to the unloading supercharger body, and the other end is connected to the BOG pipe.

[0017] Optionally, the unloading supercharger includes a pressure gauge, and the pressure gauge is used to display the boost value of the unloading supercharger.

[0018] Optionally, the storage inlet pipe and the BOG pipe are provided with a plurality of each;

[0019] One end of each of the plurality of inlet and storage pipes is used to be connected to different LNG tank trucks, and the other end is used to be connected to the storage tank;

[0020] One end of each of the BOG pipes is used to connect to different LNG tank trucks, and the other end is used to connect to the storage tank;

[0021] The first connecting pipe and the second connecting pipe are respectively provided in plurality, one end of each of the plurality of first connecting pipes is connected to different inlet and storage pipes, and the other end is connected to the unloading supercharger;

[0022] One ends of the plurality of second connecting pipes are respectively connected to different BOG pipes, and the other ends are all connected to the unloading supercharger.

[0023] Optionally, a first connection control component is provided on the first connection pipe, and the first connection control component is used to control the opening and closing of the first connection pipe.

[0024] Optionally, a second connection control member is provided on the second connection pipe, and the second connection control member is used to control the on-off of the second connection pipe.

[0025] Optionally, the first communication control member is a first communication control valve;

[0026] The second communication control member is a second communication control valve.

[0027] Optionally, the unloading supercharger is an air-temperature gasifier.

[0028] Optionally, the integrated shared LNG unloading system includes a pressure alarm device, and the pressure alarm device is arranged on the second connecting pipe.

[0029] Compared with the prior art, the embodiment of the utility model has the following advantages:

[0030] The three pipelines of the existing unloading system are streamlined into two pipelines, namely the storage inlet pipe and the BOG pipeline. The liquefied natural gas in the storage inlet pipe is gasified and pressurized by the unloading booster and then sent back to the LNG tank truck through the BOG pipe, increasing the gas phase pressure of the LNG tank truck, so that a pressure difference is formed between the LNG tank truck and the storage tank, and LNG can be sent into the storage tank through the storage inlet pipe.

[0031] This patent application not only streamlines the unloading system, but also improves the overall unloading efficiency, solving the problem of low unloading efficiency caused by the complex unloading process in the existing unloading process. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a structural diagram of the existing LNG unloading system;

[0034] Figure 2 It is a structural schematic diagram of the integrated shared LNG unloading system in the embodiment of the present application.

[0035] Description of reference numerals:

[0036] 1. Inlet pipe; 2. Unloading supercharger; 21. Unloading supercharger body; 22. First connecting pipe; 221. First connecting control piece; 23. Second connecting pipe; 231. Second connecting control piece; 3. BOG pipe; 4. LNG tank truck; 5. Storage tank; 6. LNG liquid phase pipe (inlet storage tank); 7. LNG liquid phase pipe (inlet supercharger). DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the solution of the utility model, the following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] The present application is further described in detail below in conjunction with the accompanying drawings.

[0039] LNG (liquefied natural gas) unloading system is widely used in the storage and transportation process of LNG. Its function is to pressurize the LNG in the tank truck and inject it into the LNG storage tank. The existing LNG unloading system mainly consists of 3 pipelines (LNG liquid phase pipe (into the storage tank) 6, LNG liquid phase pipe (into the unloading vehicle booster 7, BOG (gasified natural gas) pipe 3), unloading booster 2, such as Figure 1 As shown, there are many disadvantages in its operation process:

[0040] First, the unloading process is complicated, there are many operating interfaces, and the purging, replacement and pre-cooling speeds are slow. Each pre-cooling takes about 20 to 30 minutes. Otherwise, excessive stress is easily generated, causing flange leakage, which in turn leads to low unloading efficiency.

[0041] Second, when the unloading operation is nearing the end, the liquid level in the tank truck decreases, causing the pressure of the pressurized gas phase to decrease, thereby reducing the unloading rate and increasing the unloading time.

[0042] Third, when the unloading scale is large, multiple LNG unloading systems need to be set up, and equipment, pipelines and other process facilities need to be added, resulting in high project investment, large land area, and low land resource utilization rate. At the same time, the risk of leakage at the unloading flange pipe mouth is increased to a certain extent.

[0043] In response to the above-mentioned related technologies, an embodiment of the present application discloses an integrated shared LNG unloading system.

[0044] like Figure 2 As shown, an integrated shared LNG unloading system includes an inlet storage pipe 1, an unloading booster 2 and a BOG pipe 3, wherein one end of the inlet storage pipe 1 is used to be connected to the LNG tank truck 4, and the other end is used to be connected to the storage tank 5, and the inlet storage pipe 1 is used to transport LNG from the LNG tank truck into the storage tank; one end of the unloading booster 2 is connected to the inlet storage pipe 1, and the unloading booster 2 is used to gasify LNG; one end of the BOG pipe 3 is used to be connected to the LNG tank truck 4, and the other end is used to be connected to the storage tank 5; wherein the other end of the unloading booster 2 is connected to the BOG pipe 3.

[0045] The three pipelines of the existing unloading system are simplified to two pipelines, namely, the inlet storage pipe 1 and the BOG pipe 3. The liquefied natural gas in the inlet storage pipe 1 is gasified and pressurized by the unloading booster 2, and is re-sent into the LNG tank truck 4 through the BOG pipe 3, thereby increasing the gas phase pressure of the LNG tank truck 4, so that a pressure difference is formed between the LNG tank truck 4 and the storage tank 5, and the LNG can be sent into the storage tank 5 through the inlet storage pipe 1.

[0046] This patent application not only streamlines the unloading system, but also improves the overall unloading efficiency, solving the problem of low unloading efficiency caused by the complex unloading process in the existing unloading process.

[0047] This patent application not only streamlines the unloading system, but also improves the overall unloading efficiency, solving the problem of low unloading efficiency caused by the complex unloading process in the existing unloading process.

[0048] The unloading supercharger 2 includes an unloading supercharger body 21 , a first connecting pipe 22 and a second connecting pipe 23 .

[0049] One end of the first connecting pipe 22 is connected to the unloading supercharger body 21 , and the other end is connected to the inlet storage pipe 1 .

[0050] One end of the second connecting pipe 23 is connected to the unloading supercharger body 21 , and the other end is connected to the BOG pipe 3 .

[0051] Specifically, the unloading supercharger 2 is an air-temperature gasifier.

[0052] The two ends of the storage inlet pipe 1 are connected to the LNG tank truck 4 and the storage tank 5 respectively. When the pressure difference between the LNG tank truck 4 and the storage tank 5 meets the stable pressure difference, where the stable pressure difference refers to the pressure difference required for LNG to flow stably from the LNG tank truck 4 to the storage tank 5, the LNG in the LNG tank truck 4 can flow into the storage tank 5 through the storage inlet pipe 1 for storage.

[0053] When the pressure difference between the LNG tank truck 4 and the storage tank 5 does not meet the stable pressure difference, that is, the pressure difference between the LNG tank truck 4 and the storage tank 5 is less than the stable pressure difference, the unloading supercharger 2 is required to supercharge it.

[0054] The liquefied natural gas flowing into the inlet pipe 1 from the LNG tank truck 4 will flow into the unloading booster body 21 through the first connecting pipe 22 for pressurization, so that the LNG is pressurized and gasified, and the gasified natural gas is sent to the LNG tank truck 4 again through the BOG pipe 3, increasing the gas phase pressure of the LNG tank truck 4, so that the pressure difference between the LNG tank truck 4 and the storage tank 5 meets the stable pressure difference, and the LNG flows into the storage tank 5 through the inlet pipe 1 for storage. After all the LNG flows into the inlet pipe 1, the remaining gasified natural gas in the LNG tank truck 4 can flow into the storage tank 5 through the BOG pipe 3 to realize the storage of LNG.

[0055] The unloading booster 2 also includes a pressure gauge, through which the operator can know the pressure value of the gasified natural gas in real time so as to make real-time adjustments to the unloading booster 2 to prevent the occurrence of overpressure or overpressure.

[0056] The first connecting pipe 22 is provided with a first connecting control member 221 , and the first connecting control member 221 is used to control the on-off of the first connecting pipe 22 .

[0057] Specifically, the first communication control member 221 is a first communication control valve, and the first communication control member 221 is disposed at one end of the first connecting pipe 22 that is connected to the inlet storage pipe 1. When LNG flows into the storage tank 5 through the inlet storage pipe 1, the first communication control member 221 controls the first connecting pipe 22 to be disconnected from the inlet storage pipe 1, thereby preventing part of the LNG from flowing into the unloading supercharger 2.

[0058] The second connecting pipe 23 is provided with a second connecting control member 231 , and the second connecting control member 231 is used to control the on-off of the second connecting pipe 23 .

[0059] Specifically, the second connection control member 231 is a second connection control valve, and the second connection control member 231 is disposed at one end of the second connection pipe 23 connected to the BOG pipe 3. When the gaseous natural gas flows into the storage tank 5 through the BOG pipe 3, the second connection control member 231 controls the second connection pipe 23 not to be connected to the BOG pipe 3, so as to prevent part of the gaseous natural gas from flowing into the unloading supercharger 2.

[0060] The integrated shared LNG unloading system includes a pressure alarm device, which is arranged on the second connecting pipe 23 .

[0061] Specifically, the pressure alarm device is a pressure alarm, which can monitor the pressure changes of the gas in the second connecting pipe 23 in real time, and remind managers or workers to deal with possible problems in the second connecting pipe 23 in time through real-time alarm to avoid the occurrence of overpressure or low pressure.

[0062] The pressure alarm device is arranged farther away from the BOG pipe 3 than the second communication control valve.

[0063] A plurality of storage inlet pipes 1 and BOG pipes 3 are provided respectively.

[0064] One ends of the multiple storage inlet pipes 1 are respectively used to be connected to different LNG tank trucks 4 , and the other ends are all used to be connected to the storage tanks 5 .

[0065] One ends of the plurality of BOG pipes 3 are respectively used to be connected to different LNG tank trucks 4 , and the other ends are all used to be connected to the storage tanks 5 .

[0066] There are a plurality of first connecting pipes 22 and a plurality of second connecting pipes 23 , one end of each of the plurality of first connecting pipes 22 is connected to different inlet and storage pipes 1 , and the other end of each of the plurality of first connecting pipes 22 is connected to the unloading supercharger 2 .

[0067] One ends of the plurality of second connecting pipes 23 are respectively connected to different BOG pipes 3 , and the other ends are all connected to the unloading supercharger 2 .

[0068] Specifically, the number of the inlet and storage pipes 1 and the number of the BOG pipes 3 are the same, that is, the inlet and storage pipes 1 and the BOG pipes 3 are provided with a plurality of pipe systems, each of which includes one inlet and storage pipe 1 and one BOG pipe 3 .

[0069] Each set of pipe systems corresponds to an LNG tanker 4 for unloading operations.

[0070] The unloading supercharger body 21 is connected to a plurality of first connecting pipes 22 and a plurality of second connecting pipes 23, the other end of each first connecting pipe 22 is respectively connected to a corresponding inlet storage pipe 1, and each second connecting pipe 23 is respectively connected to a corresponding BOG pipe 3. The unloading supercharger 2 is used to supercharge a plurality of LNG tank trucks 4.

[0071] Furthermore, when one of the LNG tank trucks 4 is almost finished unloading the LNG, the pressure is insufficient due to the small amount of liquid in the tank truck. At this time, the gasified natural gas from the other LNG tank trucks 4 can enter the LNG tank truck 4 with insufficient pressure through the unloading booster 2 to boost its pressure and increase the unloading speed.

[0072] The unloading booster 2 is used by multiple LNG tank trucks 4. Compared with the existing practice that each LNG tank truck 4 is equipped with an unloading booster 2 for boosting, it can not only meet the unloading needs, but also significantly reduce the investment in gasification station equipment.

[0073] The integrated LNG unloading method includes the following steps:

[0074] S100, guiding the LNG to flow from the inlet storage pipe 1 into the unloading booster 2 for gasification.

[0075] Specifically, the first connecting control member 221 is opened, and the LNG enters the unloading supercharger body 21 through the inlet storage pipe 1 and the first connecting pipe 22 in sequence to be pressurized and gasified.

[0076] It should be noted that if there are multiple LNG tank trucks 4 that need to be unloaded, the LNG from the multiple LNG tank trucks 4 can be simultaneously introduced into the unloading supercharger 2 for pressurization and gasification.

[0077] S200 , guiding the gasified natural gas to flow into the LNG tank truck 4 through the BOG pipe 3 for pressurization.

[0078] S300 , guiding the pressurized LNG to flow into the storage tank 5 through the storage inlet pipe 1 .

[0079] Specifically, the gasified natural gas will increase the gas phase pressure in the LNG tank truck 4 , so that the LNG in the LNG tank truck 4 can smoothly flow into the storage tank 5 through the storage inlet pipe 1 .

[0080] It should be noted that before the LNG enters the inlet storage pipe 1 , the first communication control member 221 is controlled to cut off the communication between the inlet storage pipe 1 and the first connecting pipe 22 .

[0081] The remaining gaseous liquefied gas in the LNG tank truck 4 flows into the storage tank 5 through the BOG pipe 3 .

[0082] It should be noted that before the gaseous liquefied gas enters the BOG pipe 3 , the second connection control member 231 is controlled to disconnect the connection between the BOG pipe 3 and the second connection pipe 23 .

[0083] Furthermore, if the gas phase pressure in the LNG tank truck 4 is insufficient to support the remaining LNG to flow into the storage tank 5 , the gaseous liquefied gas in other LNG tank trucks 4 can be controlled to be replenished through the unloading booster 2 .

[0084] In summary, an integrated shared LNG unloading system includes an inlet storage pipe 1, an unloading booster 2 and a BOG pipe 3. One end of the inlet storage pipe 1 is used to be connected to the LNG tank truck 4, and the other end is used to be connected to the storage tank 5. The inlet storage pipe 1 is used to transport LNG from the LNG tank truck into the storage tank; one end of the unloading booster 2 is connected to the inlet storage pipe 1, and the unloading booster 2 is used to gasify LNG; one end of the BOG pipe 3 is used to be connected to the LNG tank truck 4, and the other end is used to be connected to the storage tank 5; wherein the other end of the unloading booster 2 is connected to the BOG pipe 3.

[0085] The three pipelines of the existing unloading system are simplified to two pipelines, namely, the inlet storage pipe 1 and the BOG pipe 3. The liquefied natural gas in the inlet storage pipe 1 is gasified and pressurized by the unloading booster 2, and is re-sent into the LNG tank truck 4 through the BOG pipe 3, thereby increasing the gas phase pressure of the LNG tank truck 4, so that a pressure difference is formed between the LNG tank truck 4 and the storage tank 5, and the LNG can be sent into the storage tank 5 through the inlet storage pipe 1.

[0086] This patent application not only streamlines the unloading system, but also improves the overall unloading efficiency, solving the problem of low unloading efficiency caused by the complex unloading process in the existing unloading process.

[0087] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0088] It should be noted that the utility model takes an integrated shared LNG unloading system as an example to introduce the specific structure and working principle of the utility model, but the application of the utility model is not limited to an integrated shared LNG unloading system, and can also be applied to the production and use of other similar workpieces.

[0089] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated shared LNG unloading system, characterized in that: include: An inlet pipe, one end of which is used to be connected to the LNG tank truck and the other end of which is used to be connected to the storage tank, and the inlet pipe is used to transport the LNG from the LNG tank truck into the storage tank; A truck unloading booster, one end of which is connected to the inlet storage pipe, and the truck unloading booster is used to gasify the LNG; BOG pipe, one end is used to connect to the LNG tanker, and the other end is used to connect to the storage tank; Wherein, the other end of the unloading supercharger is connected to the BOG pipe.

2. The integrated shared LNG unloading system according to claim 1 is characterized in that: The unloading supercharger comprises an unloading supercharger body, a first connecting pipe and a second connecting pipe; One end of the first connecting pipe is connected to the unloading supercharger body, and the other end is connected to the inlet storage pipe; One end of the second connecting pipe is connected to the unloading supercharger body, and the other end is connected to the BOG pipe.

3. The integrated shared LNG unloading system according to claim 2 is characterized in that: The unloading supercharger comprises a pressure gauge, and the pressure gauge is used to display the boost value of the unloading supercharger.

4. The integrated shared LNG unloading system according to claim 2 is characterized in that: The storage inlet pipe and the BOG pipe are respectively provided with a plurality of them; One end of each of the plurality of inlet and storage pipes is used to be connected to different LNG tank trucks, and the other end is used to be connected to the storage tank; One end of each of the BOG pipes is used to connect to different LNG tank trucks, and the other end is used to connect to the storage tank; The first connecting pipe and the second connecting pipe are respectively provided in plurality, one end of each of the plurality of first connecting pipes is connected to different inlet and storage pipes, and the other end is connected to the unloading supercharger; One ends of the plurality of second connecting pipes are respectively connected to different BOG pipes, and the other ends are all connected to the unloading supercharger.

5. The integrated shared LNG unloading system according to claim 2 is characterized in that: The first connecting pipe is provided with a first connecting control member, and the first connecting control member is used to control the on and off of the first connecting pipe.

6. The integrated shared LNG unloading system according to claim 5 is characterized in that: The second connecting pipe is provided with a second connecting control member, and the second connecting control member is used to control the on-off of the second connecting pipe.

7. The integrated shared LNG unloading system according to claim 6 is characterized in that: The first communication control member is a first communication control valve; The second communication control member is a second communication control valve.

8. The integrated shared LNG unloading system according to claim 1 is characterized in that: The unloading supercharger is an air-temperature gasifier.

9. The integrated shared LNG unloading system according to claim 2 is characterized in that: The integrated shared LNG unloading system includes a pressure alarm device, which is arranged on the second connecting pipe.

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