Gas-liquid medium conveying mechanism

Abstract

The utility model provides a gas-liquid medium conveying mechanism which comprises a conveying tank used for storing and conveying target substances, the conveying tank is provided with a first connector, a second connector and a third connector, and the first connector is located at the top end of the conveying tank; a storage tank for storing a target substance; the conveying assembly is used for conveying the target substance in the conveying tank into the storage tank, the conveying assembly comprises a first pipe fitting, one end of the first pipe fitting is communicated with the second connector, and the other end of the first pipe fitting is communicated with the first connector; the pressurizing part is arranged on the first pipe fitting, and the liquid-phase target substance in the transportation tank flows back into the transportation tank through the first connector after passing through the pressurizing part so as to pressurize the transportation tank; and the two ends of the second pipe fitting communicate with the third connector and the storage tank correspondingly, and at least part of the target substance in the conveying tank is conveyed into the storage tank through the second pipe fitting. The problem that in the prior art, natural gas unloading is not thorough, and consequently the cost of a gas station is increased is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas unloading, in particular to a gas-liquid medium conveying mechanism. Background Art

[0002] At present, in the unloading process of natural gas (LNG) gas stations, a self-pressurizing unloading method is generally adopted, that is, the transport tank 100 is pressurized by using an unloading booster gasifier to make the pressure of the transport tank 100 higher than the pressure of the storage tank. At the same time, the BOG valve of the storage tank is opened to reduce the pressure of the storage tank, and the LNG is unloaded to the storage tank through the pressure difference.

[0003] However, in the later period, as the liquid level in the storage tank continues to rise and the LNG used for pressurization in the transport tank 100 continues to decrease, the pressure in the transport tank 100 cannot be guaranteed, the pressure difference between the two continues to decrease, and eventually the unloading of liquid and the unloading of the truck are stopped; this results in a large amount of residual natural gas in the transport truck, which directly increases the cost of the gas station. Utility Model Content

[0004] The main purpose of the utility model is to provide a gas-liquid medium conveying mechanism to solve the problem in the prior art that incomplete unloading of natural gas leads to increased gas station costs.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a gas-liquid medium conveying mechanism is provided, including: a transport tank, used to store and transport the target substance, the transport tank is provided with a first interface, a second interface and a third interface, the first interface is located at the top of the transport tank; a storage tank, used to store the target substance; a conveying component, arranged between the transport tank and the storage tank, used to convey the target substance in the transport tank to the storage tank, the conveying component including: a first pipe fitting, one end of the first pipe fitting is connected to the second interface, and the other end of the first pipe fitting is connected to the first interface; a boosting component, arranged on the first pipe fitting, after the liquid-phase target substance in the transport tank passes through the boosting component, it flows back to the transport tank through the first interface to pressurize the transport tank; a second pipe fitting, the two ends of the second pipe fitting are respectively connected to the third interface and the storage tank, and at least part of the target substance in the transport tank is conveyed to the storage tank through the second pipe fitting.

[0006] Furthermore, the delivery assembly further includes: a first control valve and a second control valve, which are respectively arranged on the first pipe and communicated with the first pipe, and the first control valve and the second control valve are respectively located at the inlet end of the boosting component.

[0007] Furthermore, the delivery assembly further includes: a third control valve and a fourth control valve, which are respectively arranged on the first pipe and communicated with the first pipe, and the third control valve and the fourth control valve are respectively arranged at the outlet end of the boosting component.

[0008] Furthermore, the conveying assembly also includes: a fifth control valve, which is arranged on the second pipe fitting and connected to the second pipe fitting; a third pipe fitting, one end of the third pipe fitting is connected to the second pipe fitting, and the other end of the third pipe fitting is connected to the top of the storage tank; a fourth pipe fitting, one end of the fourth pipe fitting is connected to the second pipe fitting, and the other end of the fourth pipe fitting is connected to the bottom of the storage tank.

[0009] Furthermore, the conveying assembly also includes: a sixth control valve, which is arranged on the third pipe fitting and communicated with the third pipe fitting; and a seventh control valve, which is arranged on the fourth pipe fitting and communicated with the fourth pipe fitting.

[0010] Furthermore, the gas-liquid medium conveying mechanism also includes: a pressure relief component; a fifth pipe fitting, the two ends of which are respectively connected to the storage tank and the pressure relief component; and a sixth pipe fitting, the two ends of which are respectively connected to the transport tank and the pressure relief component.

[0011] Furthermore, the gas-liquid medium conveying mechanism also includes: an eighth control valve, which is provided on the fifth pipe fitting and communicated with the fifth pipe fitting; and a ninth control valve, which is provided on the sixth pipe fitting and communicated with the sixth pipe fitting.

[0012] Furthermore, the first pipe fitting includes a first pipe section and a second pipe section, the first pipe section is connected to the second interface, the second pipe section is connected to the first interface, the boosting component is connected between the first pipe section and the second pipe section, and the end of the sixth pipe fitting away from the pressure relief component is connected to the second pipe section.

[0013] Furthermore, the second interface is located below the third interface; and / or, the gas-liquid medium conveying mechanism further includes: a first pressure detection component, at least partially disposed in the transport tank to detect the pressure in the transport tank.

[0014] Furthermore, the gas-liquid medium conveying mechanism also includes: a second pressure detection component, which is at least partially arranged in the storage tank to detect the pressure in the storage tank.

[0015] The invention relates to a gas-liquid medium conveying mechanism comprising a transport tank, a storage tank, and a conveying assembly, wherein the two ends of the conveying assembly are respectively connected to the transport tank and the storage tank, and are used to convey the target substance in the transport tank to the storage tank, wherein the conveying assembly comprises a first pipe, a pressurizing component, and a second pipe, wherein one end of the first pipe is connected to the second interface, and the other end of the first pipe is connected to the first interface; the pressurizing component is arranged on the first pipe, and the liquid target substance in the transport tank flows back into the transport tank through the first interface after passing through the pressurizing component, thereby pressurizing the transport tank; the two ends of the second pipe are respectively connected to the third interface and the storage tank, and at least a portion of the target substance in the transport tank is conveyed to the storage tank through the second pipe. In this way, during the process of conveying the target substance, the liquid target substance is pressurized and then converted into gaseous target substance and returned to the transport tank, thereby pressurizing the transport tank, so that the target substance inside the transport tank is conveyed to the storage tank through the second pipe under the action of pressure for storage, so as to ensure that the pressure difference between the transport tank and the storage tank is always maintained within a predetermined range, thereby facilitating the reduction of the target substance residue in the transport tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A structural schematic diagram of an embodiment of a gas-liquid medium conveying mechanism according to the present utility model is shown.

[0018] The above drawings include the following reference numerals:

[0019] 100. Transport tank; 200. Storage tank; 300. Conveying assembly; 310. First pipe fitting; 320. Pressurizing component; 330. Second pipe fitting; 311. First control valve; 312. Second control valve; 313. Third control valve; 314. Fourth control valve; 331. Fifth control valve; 340. Third pipe fitting; 350. Fourth pipe fitting; 341. Sixth control valve; 351. Seventh control valve; 400. Pressure relief component; 500. Fifth pipe fitting; 600. Sixth pipe fitting; 510. Eighth control valve; 610. Ninth control valve; 315. First pipe section; 316. Second pipe section; 700. First pressure detection component; 800. Second pressure detection component. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] Please refer to Figure 1 The present application provides a gas-liquid medium conveying mechanism, comprising: a transport tank 100 for storing and transporting a target substance, the transport tank 100 being provided with a first interface, a second interface and a third interface, the first interface being located at the top of the transport tank 100; a storage tank 200 for storing the target substance; a conveying assembly 300, disposed between the transport tank 100 and the storage tank 200, for conveying the target substance in the transport tank 100 to the storage tank 200, the conveying assembly 300 comprising: a first pipe 310, a first pipe 310 One end of the first pipe fitting 310 is connected to the second interface, and the other end of the first pipe fitting 310 is connected to the first interface; the boosting component 320 is arranged on the first pipe fitting 310, and the liquid target substance in the transport tank 100 passes through the boosting component 320 and then flows back into the transport tank 100 through the first interface to pressurize the transport tank 100; the second pipe fitting 330, and the two ends of the second pipe fitting 330 are respectively connected to the third interface and the storage tank 200, and at least part of the target substance in the transport tank 100 is transported to the storage tank 200 through the second pipe fitting 330.

[0022] According to the gas-liquid medium conveying mechanism provided in the present application, it includes a transport tank 100, a storage tank 200 and a conveying assembly 300, and the two ends of the conveying assembly 300 are respectively connected to the transport tank 100 and the storage tank 200, and are used to convey the target substance in the transport tank 100 to the storage tank 200, wherein the conveying assembly 300 includes a first pipe fitting 310, a boosting component 320 and a second pipe fitting 330, one end of the first pipe fitting 310 is connected to the second interface, and the other end of the first pipe fitting 310 is connected to the first interface; the boosting component 320 is arranged on the first pipe fitting 310, and the liquid-phase target substance in the transport tank 100 passes through the boosting component 320 and then flows back to the transport tank 100 through the first interface to pressurize the transport tank 100; the two ends of the second pipe fitting 330 are respectively connected to the third interface and the storage tank 200, and at least part of the target substance in the transport tank 100 is conveyed to the storage tank 200 through the second pipe fitting 330. In this way, during the process of transporting the target substance, the liquid target substance is pressurized and then converted into a gaseous target substance and returned to the transport tank 100, thereby pressurizing the inside of the transport tank 100, so that the target substance inside the transport tank 100 is transported to the storage tank 200 through the second pipe 330 under the action of pressure for storage, so as to ensure that the pressure difference between the transport tank 100 and the storage tank 200 is always maintained within a predetermined range, which is conducive to reducing the residue of the target substance in the transport tank 100.

[0023] Specifically, the delivery assembly 300 further includes a first control valve 311 and a second control valve 312, each disposed on and in communication with the first pipe 310. The first control valve 311 and the second control valve 312 are located at the inlet of the pressurizing component 320. The provision of the first control valve 311 and the second control valve 312, with their spacing, facilitates controlling the flow of the target substance into the pressurizing component 320, thereby adjusting the openings of the first control valve 311 and the second control valve 312 according to actual pressure requirements.

[0024] Furthermore, the conveying assembly 300 further includes a third control valve 313 and a fourth control valve 314, each disposed on and in communication with the first pipe 310. The third control valve 313 and the fourth control valve 314 are disposed at the outlet of the pressurizing component 320. The provision of the third control valve 313 and the fourth control valve 314 facilitates control of the flow of gas out of the pressurizing component 320, thereby regulating the pressure within the transport tank 100.

[0025] In the examples provided in this application, Figure 1 As shown, the delivery assembly 300 further includes: a fifth control valve 331, which is disposed on the second pipe 330 and communicates with the second pipe 330; a third pipe 340, one end of which is communicated with the second pipe 330 and the other end of which is communicated with the top of the storage tank 200; and a fourth pipe 350, one end of which is communicated with the second pipe 330 and the other end of which is communicated with the bottom of the storage tank 200. The fifth control valve 331 is provided to control the flow rate of the target substance in the second pipe 330. The third and fourth pipes 340 and 350 are provided to transport target substances in different states. For example, when transporting a gaseous target substance, the fourth pipe 350 can be opened for conduction, while when transporting a liquid target substance, the third pipe 340 can be opened for conduction.

[0026] In a specific implementation, the conveying assembly 300 further includes a sixth control valve 341 disposed on and in communication with the third pipe 340; and a seventh control valve 351 disposed on and in communication with the fourth pipe 350. The sixth control valve 341 and the seventh control valve 351 respectively control the on / off states of the third pipe 340 and the fourth pipe 350.

[0027] In the present application, the gas-liquid medium conveying mechanism further includes: a pressure relief component 400; a fifth pipe 500, the ends of which are respectively connected to the storage tank 200 and the pressure relief component 400; and a sixth pipe 600, the ends of which are respectively connected to the transport tank 100 and the pressure relief component 400. Preferably, the pressure relief component 400 is a vacuum pump body, which is used to extract the gas in the storage tank 200 to increase the pressure difference between the storage tank 200 and the transport tank 100, or directly extract the gas in the transport tank 100.

[0028] Furthermore, the gas-liquid medium delivery mechanism further includes: an eighth control valve 510, which is disposed on and communicated with the fifth pipe fitting 500; and a ninth control valve 610, which is disposed on and communicated with the sixth pipe fitting 600. By disposing the eighth control valve 510 and the ninth control valve 610, the on / off states of the fifth pipe fitting 500 and the sixth pipe fitting 600 are controlled, respectively.

[0029] In a specific implementation, the first pipe member 310 includes a first pipe section 315 and a second pipe section 316. The first pipe section 315 is connected to the second interface, and the second pipe section 316 is connected to the first interface. The pressurizing component 320 is connected between the first pipe section 315 and the second pipe section 316. The end of the sixth pipe member 600 away from the pressure relief component 400 is connected to the second pipe section 316. This configuration optimizes the pipeline structure and makes it more concise. No additional pipeline is required between the pressure relief component 400 and the transport tank 100. The transmission path of the pipeline can be switched by the first control valve 311 and the second control valve 312 on the first pipe section 315 and the third control valve 313 and the fourth control valve 314 on the second pipe section 316.

[0030] Preferably, the second interface is located below the third interface; this arrangement facilitates the delivery of the liquid target substance into the storage tank 200. The liquid target substance at the second interface is used to vaporize and pressurize the transport tank 100. The liquid target substance in the transport tank 100 is then preferentially discharged through the third interface under the action of pressure. And / or, the gas-liquid medium delivery mechanism further includes: a first pressure detection component 700, at least partially disposed within the transport tank 100, to detect the pressure within the transport tank 100. The gas-liquid medium delivery mechanism further includes: a second pressure detection component 800, at least partially disposed within the storage tank 200, to detect the pressure within the storage tank 200.

[0031] In the present application, the first pressure detection component 700 and the second pressure detection component 800 are pressure measuring instruments, respectively. The boosting component 320 is a booster.

[0032] Taking natural gas as an example, when the target substance in this application is initially unloaded from the LNG transport tank 100 at a gas station, the tank contains liquid LNG. The tank is pressurized by the booster component 320 of the transport tank 100. After the liquid is discharged from the liquid phase pipe of the transport tank 100, it enters the booster component 320 through the opening of the first control valve 311 and the second control valve 312, becomes gaseous, and then enters the transport tank 100 for pressurization. The liquid LNG is then pressed into the storage tank 200 through the opening of the fifth control valve 331 and the sixth control valve 341. Using an upward liquid inlet method, the LNG enters the storage tank, cooling and reducing the pressure of the gaseous LNG in the storage tank. Simultaneously, the BOG gas in the storage tank is extracted from the storage tank by the pressure relief component 400 at the top of the storage tank through the opening of the eighth control valve 510, thereby reducing the internal pressure of the storage tank. This increases the pressure differential between the transport tank 100 and the storage tank, thereby improving the unloading speed.

[0033] When the liquid unloading reaches the middle stage and a gas-liquid mixture state appears in the transport tank 100, the upper liquid inlet mode is closed (the sixth control valve 341 is closed), and the lower liquid inlet unloading mode is opened. The seventh control valve 351 is opened, and the low-temperature liquid-phase LNG at the bottom of the storage tank 200 is used to cool and reduce the pressure of the gas-phase LNG in the transport tank 100. At the same time, a pump (pressure relief component) is used on the upper part of the storage tank to extract the BOG gas in the storage tank.

[0034] When the liquid is unloaded to the later stage, the transport tank 100 is in a completely gaseous state, the pressure in the storage tank is the same as the pressure in the transport tank 100, and the upper and lower liquid inlets are closed (close the first control valve, the second control valve, the fifth control valve, the sixth control valve, the seventh control valve, and open the ninth control valve 610). The pump directly acts on the transport tank 100, and the remaining gaseous LNG in the transport tank 100 is directly pumped out to the pipeline network for direct use.

[0035] In summary, the system for reducing unloading errors of the present application optimizes the unloading method by adding a compressor and utilizing the characteristics of slow pressure increase by combining liquid LNG and gaseous LNG. Different unloading methods are performed according to the different basic states of LNG in the transport tank 100. Under the original unloading mode, a bottom liquid unloading method under a gas-liquid mixed state and a pumping and pressure unloading method under a gas phase state are newly added. Finally, the unloading error is reduced from the previous 150kg / vehicle to 30kg / vehicle, and the unloading time is shortened from 4.5h / vehicle to 4h / vehicle.

[0036] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0037] According to the gas-liquid medium conveying mechanism provided in the present application, it includes a transport tank 100, a storage tank 200 and a conveying assembly 300, and the two ends of the conveying assembly 300 are respectively connected to the transport tank 100 and the storage tank 200, and are used to convey the target substance in the transport tank 100 to the storage tank 200, wherein the conveying assembly 300 includes a first pipe fitting 310, a boosting component 320 and a second pipe fitting 330, one end of the first pipe fitting 310 is connected to the second interface, and the other end of the first pipe fitting 310 is connected to the first interface; the boosting component 320 is arranged on the first pipe fitting 310, and the liquid-phase target substance in the transport tank 100 passes through the boosting component 320 and then flows back to the transport tank 100 through the first interface to pressurize the transport tank 100; the two ends of the second pipe fitting 330 are respectively connected to the third interface and the storage tank 200, and at least part of the target substance in the transport tank 100 is conveyed to the storage tank 200 through the second pipe fitting 330. In this way, during the process of transporting the target substance, the liquid target substance is pressurized and then converted into a gaseous target substance and returned to the transport tank 100, thereby pressurizing the inside of the transport tank 100, so that the target substance inside the transport tank 100 is transported to the storage tank 200 through the second pipe 330 under the action of pressure for storage, so as to ensure that the pressure difference between the transport tank 100 and the storage tank 200 is always maintained within a predetermined range, which is conducive to reducing the residue of the target substance in the transport tank 100.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A gas-liquid medium conveying mechanism, characterized in that: include: A transport tank (100) is used to store and transport a target substance, wherein the transport tank (100) is provided with a first interface, a second interface, and a third interface, wherein the first interface is located at the top of the transport tank (100); a storage tank (200), for storing the target substance; A conveying assembly (300) is provided between the transport tank (100) and the storage tank (200) and is used to convey the target substance in the transport tank (100) to the storage tank (200). The conveying assembly (300) includes: a first pipe (310), one end of the first pipe (310) being in communication with the second interface, and the other end of the first pipe (310) being in communication with the first interface; a pressurizing component (320) disposed on the first pipe (310); after the liquid target substance in the transport tank (100) passes through the pressurizing component (320), it flows back into the transport tank (100) through the first interface, thereby pressurizing the transport tank (100); A second pipe (330), both ends of which are respectively connected to the third interface and the storage tank (200), and at least part of the target substance in the transport tank (100) is transported to the storage tank (200) through the second pipe (330).

2. The gas-liquid medium conveying mechanism according to claim 1, characterized in that: The conveying assembly (300) further includes: The first control valve (311) and the second control valve (312) are respectively arranged on the first pipe (310) and communicated with the first pipe (310). The first control valve (311) and the second control valve (312) are respectively located at the inlet end of the pressurizing component (320).

3. The gas-liquid medium conveying mechanism according to claim 1, characterized in that: The conveying assembly (300) further comprises: The third control valve (313) and the fourth control valve (314) are respectively arranged on the first pipe (310) and communicated with the first pipe (310). The third control valve (313) and the fourth control valve (314) are respectively arranged at the outlet end of the pressurizing component (320).

4. The gas-liquid medium conveying mechanism according to claim 1, characterized in that: The conveying assembly (300) further includes: a fifth control valve (331), disposed on the second pipe (330) and communicating with the second pipe (330); a third pipe (340), one end of the third pipe (340) being in communication with the second pipe (330), and the other end of the third pipe (340) being in communication with the top of the storage tank (200); A fourth pipe (350), one end of which is connected to the second pipe (330), and the other end of which is connected to the bottom of the storage tank (200).

5. The gas-liquid medium conveying mechanism according to claim 4, characterized in that: The conveying assembly (300) further comprises: a sixth control valve (341), disposed on the third pipe member (340) and communicating with the third pipe member (340); A seventh control valve (351) is provided on the fourth pipe member (350) and is in communication with the fourth pipe member (350).

6. The gas-liquid medium conveying mechanism according to claim 1, characterized in that: The gas-liquid medium delivery mechanism further comprises: a pressure relief component (400); a fifth pipe fitting (500), the two ends of which are respectively connected to the storage tank (200) and the pressure relief component (400); A sixth pipe (600), both ends of which are respectively connected to the transport tank (100) and the pressure relief component (400).

7. The gas-liquid medium conveying mechanism according to claim 6, characterized in that: The gas-liquid medium delivery mechanism further comprises: an eighth control valve (510), disposed on the fifth pipe (500) and in communication with the fifth pipe (500); A ninth control valve (610) is provided on the sixth pipe member (600) and is in communication with the sixth pipe member (600).

8. The gas-liquid medium conveying mechanism according to claim 6, characterized in that: The first pipe fitting (310) includes a first pipe section (315) and a second pipe section (316); the first pipe section (315) is connected to the second interface; the second pipe section (316) is connected to the first interface; the pressurizing component (320) is connected between the first pipe section (315) and the second pipe section (316); and the end of the sixth pipe fitting (600) away from the pressure relief component (400) is connected to the second pipe section (316).

9. The gas-liquid medium conveying mechanism according to claim 1, characterized in that: The second interface is located below the third interface; and / or, The gas-liquid medium delivery mechanism further comprises: A first pressure detection component (700) is at least partially disposed in the transport tank (100) to detect the pressure in the transport tank (100).

10. The gas-liquid medium conveying mechanism according to claim 1, characterized in that: The gas-liquid medium delivery mechanism also includes: A second pressure detection component (800) is at least partially disposed in the storage tank (200) to detect the pressure in the storage tank (200).

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