Tank truck loading system

Abstract

The present application discloses a tank truck loading system, including: a first pipeline, the first pipeline is connected to the tank truck liquid adding arm through a liquid phase crane pipe, and is used for tank truck filling; a second pipeline, the first end of the second pipeline is connected to the tank truck exhaust arm through a gas phase crane pipe, and is used for exhausting during the tank truck filling process, and the second end of the second pipeline is connected to a gas recovery device; a third pipeline, the first end of the third pipeline is connected to a nitrogen storage tank, and the second end of the third pipeline is connected to a purge port of the tank truck, and is used to introduce nitrogen into the tank truck; a first branch pipe, the first branch pipe is connected to the second pipeline through a three-way valve one, and the end of the first branch pipe is connected to a negative pressure device; a second branch pipe, the two ends of the second branch pipe are respectively connected to the first pipeline and the third pipeline through three-way valve two and three-way valve three. The present application achieves the technical effect of improving the purge effect and purge efficiency of the tank body and related pipelines of the tank truck, thereby solving the problem of poor purge effect on the pipe body and related pipelines during tank truck loading in the related technology.

Description

Technical Field

[0001] The present application relates to the technical field of natural gas loading, and in particular to a tank truck loading system. Background Art

[0002] At present, the main ways of natural gas storage and transportation are: LNG (liquefied natural gas), CNG (compressed natural gas), ANG (adsorbed natural gas) and NGH (natural gas hydrate). Among them, LNG (liquefied natural gas) is a clean and efficient energy source, which overcomes the characteristic of natural gas being too large in volume. The volume of the same amount of LNG is 1 / 625 of that of natural gas under standard conditions. At the same time, LNG has excellent storage and transportation advantages, so LNG has become the main way of natural gas storage and transportation.

[0003] Before loading, the tank and related pipelines of the tank truck need to be purged to discharge impurities in the tank and related pipelines. In the related art, pressurized gas, such as nitrogen or air, is generally introduced into one side, resulting in poor purging effect. Utility Model Content

[0004] The main purpose of the present application is to provide a tank truck loading system to solve the problem of poor purge effect on the pipe body and related pipelines during the tank truck loading process in the related art.

[0005] In order to achieve the above-mentioned object, the present application provides a tank truck loading system, comprising: a first pipeline, the first pipeline is connected to the tank truck filling arm through a liquid phase crane pipe, and is used for filling the tank truck;

[0006] A second pipeline, wherein a first end of the second pipeline is connected to the exhaust arm of the tank truck through a gas phase crane for exhausting the tank truck during filling, and a second end of the second pipeline is connected to a gas recovery device;

[0007] a third pipeline, wherein a first end of the third pipeline is connected to the nitrogen storage tank, and a second end of the third pipeline is connected to the purge port of the tank truck, for introducing nitrogen into the tank truck;

[0008] A first branch pipe, the first branch pipe is connected to the second pipeline through a three-way valve 1, and a negative pressure device is connected to the end of the first branch pipe;

[0009] The second branch pipe has two ends connected to the first pipeline and the third pipeline respectively through a three-way valve 2 and a three-way valve 3.

[0010] Furthermore, it also includes a gas filtering device, wherein the air inlet end of the gas filtering device is connected to the first branch pipe, and the air outlet end of the gas filtering device is connected to the negative pressure device.

[0011] Furthermore, the tank truck loading system also includes a third branch pipe, a first end of the third branch pipe is connected to an end of the tank truck away from the purge port through a control valve, and a second end of the third branch pipe is connected to the second pipeline through a three-way valve four.

[0012] Furthermore, it also includes a spring tube, the first end of which is connected to the third pipeline through a three-way valve 5, and the second end of which is provided with a purge gun.

[0013] Furthermore, three-way valve five and three-way valve three are arranged in sequence along the flow direction of the nitrogen in the third pipeline.

[0014] Furthermore, the first end of the spring tube is connected to the three-way valve 5 through a quick connector, and the second end of the spring tube is connected to the purge gun through a quick connector.

[0015] Furthermore, the liquid phase crane pipe is connected to the tank truck's liquid adding arm through a low-temperature dry quick connector; the gas phase crane pipe is connected to the tank truck's exhaust arm through a low-temperature dry quick connector.

[0016] Furthermore, a filter cavity is provided in the gas filtering device, and a filter element is provided in the filter cavity. The filter cavity is divided into two chambers by the filter element, one of the chambers is connected to the first branch pipe, and the other chamber is connected to the negative pressure device.

[0017] Furthermore, the filter element is detachably connected to the filter cavity.

[0018] Furthermore, it also includes a first pressure sensor, which is arranged on the first pipeline.

[0019] In an embodiment of the present application, a first pipeline is provided, the first pipeline is connected to the tank truck's liquid filling arm through a liquid phase crane pipe for filling the tank truck; a second pipeline, the first end of the second pipeline is connected to the tank truck's exhaust arm through a gas phase crane pipe for exhausting the tank truck during filling, and the second end of the second pipeline is connected to a gas recovery device; a third pipeline, the first end of the third pipeline is connected to a nitrogen storage tank, and the second end of the third pipeline is connected to a purge port of the tank truck for introducing nitrogen into the tank truck; a first branch pipe, the first branch pipe is connected to the second pipeline through a three-way valve, and the end of the first branch pipe is connected to a negative pressure device; the second branch pipe, The two ends of the second branch pipe are connected to the first pipeline and the third pipeline respectively through the three-way valve second and the three-way valve third, so that before filling, the third pipeline and the second branch pipe can be used to introduce nitrogen into the tank body of the tank truck and the first pipeline to apply positive pressure to the tank body, and the first pipeline and the first branch pipe can be used to apply negative pressure to the tank body, so as to accelerate the flow speed of the gas in the tank body and related pipelines under the synchronous action of the positive pressure and the negative pressure, thereby achieving the technical effect of improving the purging effect and purging efficiency of the tank body and related pipelines of the tank truck, and further solving the problem of poor purging effect on the pipe body and related pipelines during the tank truck loading process in the related technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0021] Figure 1 is a schematic diagram of a tank truck loading system according to an embodiment of the present application;

[0022] Among them, 1 gas storage equipment, 2 the third pipeline, 3 the second pipeline, 4 the first pipeline, 5 spring tube, 6 the second branch pipe, 7 three-way valve three, 8 three-way valve five, 9 nitrogen storage tank, 10 three-way valve two, 11 three-way valve one, 12 gas recovery equipment, 13 the first branch pipe, 14 gas filtration equipment, 15 negative pressure equipment, 16 three-way valve four, 17 the third branch pipe, 18 control valve, 19 tank body, 20 purge gun. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so as to describe the embodiments of the present application described herein.

[0025] In this application, the terms "upper", "lower", "inner", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0026] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0027] In addition, the terms "disposed", "provided with", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0028] In addition, the term "plurality" shall mean two or more.

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] Before loading, the tank and related pipelines of the tank truck need to be purged to discharge impurities in the tank and related pipelines. In the related art, pressurized gas, such as nitrogen or air, is generally introduced into one side, resulting in poor purging effect.

[0031] To solve the above technical problems, Figure 1 As shown, an embodiment of the present application provides a tank truck loading system, comprising: a first pipeline 4, the first pipeline 4 is connected to a tank truck liquid filling arm through a liquid phase crane pipe, and is used for tank truck filling;

[0032] A second pipeline 3, a first end of the second pipeline 3 is connected to the exhaust arm of the tank truck through a gas phase crane, which is used for exhausting the tank truck during filling, and a second end of the second pipeline 3 is connected to the gas recovery device 12;

[0033] A third pipeline 2, wherein a first end of the third pipeline 2 is connected to a nitrogen storage tank 9, and a second end of the third pipeline 2 is connected to a purge port of a tank truck, for introducing nitrogen into the tank truck;

[0034] A first branch pipe 13, the first branch pipe 13 is connected to the second pipeline 3 through a three-way valve 11, and a negative pressure device 15 is connected to the end of the first branch pipe 13;

[0035] The second branch pipe 6 has two ends connected to the first pipeline 4 and the third pipeline 2 through a three-way valve 2 10 and a three-way valve 3 7 , respectively.

[0036] In the present embodiment, the first end of the first pipeline 4 is connected to the tank truck's liquid filling arm through a liquid phase crane, and the second end is connected to the gas storage device 1. After opening the corresponding liquid inlet valve, the liquefied gas in the gas storage device 1 can enter the tank body 19 of the tank truck through the first pipeline 4 and the liquid phase crane. The first end of the second pipeline 3 is connected to the tank truck's exhaust arm through a gas phase crane, and the second end is connected to the gas recovery device 12. During the tank truck loading process, the gas in the tank body 19 can flow back to the gas recovery device 12 through the second pipeline 3. In the present embodiment, the second pipeline 3 is mainly used to introduce nitrogen into the tank body 19 of the tank truck after the tank truck is loaded to replace the air and gasified natural gas in the tank body 19. The replaced gas can enter the gas recovery device 12 through the second pipeline 3 for the next step of processing.

[0037] In the present embodiment, the third pipeline 2 is used to purge the tank body 19 and related pipelines of the tank truck. Specifically, the first end of the third pipeline 2 is connected to the nitrogen storage tank 9, and the second end of the third pipeline 2 is connected to the purge port of the tank truck, which is used to introduce nitrogen into the tank truck. On this basis, the first branch pipe 13 and the second branch pipe 6 are also provided in the present embodiment, wherein the first branch pipe 13 is used to apply negative pressure to the tank body 19 of the tank truck, and the second branch pipe 6 is used to pass nitrogen into the first pipeline 4 to purge the first pipeline 4. Specifically, the first branch pipe 13 in the present embodiment is connected to the second pipeline 3 through a three-way valve 11, and the end of the first branch pipe 13 is connected to a negative pressure device 15, and the two ends of the second branch pipe 6 are respectively connected to the first pipeline 4 and the third pipeline 2 through a three-way valve 2 10 and a three-way valve 3 7.

[0038] During loading, the second pipeline 3 and the first branch pipe 13 are connected through the three-way valve 11, and the second pipeline 3 and the gas recovery device 12 are closed. At the same time, the two ends of the second branch pipe 6 are connected with the first pipeline 4 and the third pipeline 2 respectively through the three-way valve 2 10 and the three-way valve 3 7. At this time, the third pipeline 2, the second branch pipe 6, the first pipeline 4, the tank body 19 of the tank truck, the second pipeline 3, and the first branch pipe 13 are in a connected state to form a gas channel. The pressurized nitrogen in the nitrogen storage tank 9 enters the gas channel and applies positive pressure to the tank body 19. At the same time, the negative pressure device 15 is turned on to apply negative pressure to the tank body 19. In other words, in this embodiment, one end of the gas channel has positive pressure and the other end has negative pressure, so that the gas in the gas channel can be pushed and pulled to accelerate the flow, and then the tank body 19 of the tank truck and the first pipeline 4 and the second pipeline 3 can be efficiently purged.

[0039] This embodiment achieves the purpose of accelerating the flow rate of gas in the tank body 19 and related pipelines under the synchronous action of positive and negative pressures before filling by using the third pipeline 2 and the second branch pipe 6 to introduce nitrogen into the tank body 19 of the tank truck and the first pipeline 4 to apply positive pressure to the tank body 19, and at the same time using the first pipeline 4 and the first branch pipe 13 to apply negative pressure to the tank body 19, thereby achieving the technical effect of improving the purging effect and purging efficiency of the tank body 19 and related pipelines of the tank truck, thereby solving the problem of poor purging effect of the pipe body and related pipelines during tank truck loading in the related technology.

[0040] In order to prevent the impurities in the air flow from directly entering the negative pressure device 15 when the tank 19 and the pipeline are purged, thereby damaging the negative pressure device 15, the loading system in this embodiment further includes a gas filter device 14, the air inlet end of the gas filter device 14 is connected to the first branch pipe 13, and the air outlet end of the gas filter device 14 is connected to the negative pressure device 15.

[0041] Specifically, the gas drawn by the negative pressure device 15 first enters the filtering device, and the impurities in the gas are filtered by the filtering device before entering the negative pressure device 15, and is drawn out by the negative pressure device 15. Since the discharged gas contains nitrogen, a nitrogen recovery device can be connected to the exhaust end of the negative pressure device 15 to recover the nitrogen for reuse.

[0042] In this embodiment, the tank body 19 of the tank truck is purged mainly by applying positive pressure to the air inlet end (i.e., the purge port) of the tank body 19 and applying negative pressure to the air outlet end to promote and pull the gas flow. Therefore, in order to improve the airflow in the tank body 19 to a greater extent so that it can contact the internal space of the tank body 19, the air inlet end and the air outlet end of the tank body 19 are respectively arranged at the two ends of the tank body 19 in this embodiment. Therefore, in order to enable the air outlet end of the tank body 19 to be connected to the second pipeline 3, the tank truck loading system in this embodiment also includes a third branch pipe 17, the first end of the third branch pipe 17 is connected to the end of the tank truck away from the purge port through the control valve 18, and the second end of the third branch pipe 17 is connected to the second pipeline 3 through the three-way valve 16.

[0043] Specifically, it should be noted that the third branch pipe 17 spans the length of the tank body 19 of the tank truck, and its two ends are respectively connected to the gas outlet end of the tank truck and the second pipeline 3. The corresponding ball valve can be used to open and close the gas outlet end, and the other end needs to be connected to the second pipeline 3 through the three-way valve 4 16. During purging, the control valve 18 and the three-way valve 4 16 are opened to connect the third branch pipe 17 with the second pipeline 3. The nitrogen in the third pipeline 2 enters from one end of the tank body 19, flows out from the other end and enters the third branch pipe 17, then enters the second pipeline 3, and finally enters the first branch pipe 13.

[0044] The connection between the liquid phase crane pipe and the gas phase crane pipe and the tank truck is generally a flange connection, so as to ensure sufficient sealing. Since the connected flange is exposed to the outside, it is easy for impurities to adhere to the surface. For this reason, the loading system in this embodiment also includes a spring tube 5, the first end of the spring tube 5 is connected to the third pipeline 2 through a three-way valve 58, and the second end of the spring tube 5 is provided with a purge gun 20. Before the flange connection, each flange to be connected can be purged by the purge gun 20. The setting of the spring tube 5 enables the purge gun 20 to be moved freely within a certain range, so that the flange can be purged from various angles.

[0045] Since the purge gun 20 is used to purge the flange before connection, in this embodiment, the three-way valve 5 8 and the three-way valve 3 7 are arranged in sequence along the flow direction of nitrogen in the third pipeline 2. With this arrangement, when the purge gun 20 is used for purge, it is only necessary to adjust the three-way valve 5 8 to connect the front end of the third pipeline 2 with the spring tube 5. After the purge is completed, the three-way valve 5 8 can be adjusted to close the third pipeline 2 and the spring tube 5.

[0046] To facilitate the installation of the spring tube 5, the first end of the spring tube 5 in this embodiment is connected to the three-way valve 58 through a quick connector, and the second end of the spring tube 5 is connected to the purge gun 20 through a quick connector. Furthermore, the liquid phase crane pipe is connected to the tank truck liquid adding arm through a low-temperature dry quick connector; the gas phase crane pipe is connected to the tank truck exhaust arm through a low-temperature dry quick connector.

[0047] In one embodiment of the gas filtering device 14 , a filter chamber is provided in the gas filtering device 14 , and a filter element is provided in the filter chamber. The filter chamber is divided into two chambers by the filter element, one of which is connected to the first branch pipe 13 , and the other is connected to the negative pressure device 15 .

[0048] Furthermore, the filter element is detachably connected to the filter cavity.

[0049] Furthermore, the tank truck loading system also includes a first pressure sensor, which is arranged on the first pipeline.

[0050] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Within the spirit and principle of the present application, any modification, equivalent replacement, improvement, etc. made shall be included in the protection scope of the present application.

Claims

1. A tank truck loading system, characterized in that: include: A first pipeline, which is connected to a tank truck filling arm through a liquid phase crane pipe and is used for tank truck filling; A second pipeline, wherein a first end of the second pipeline is connected to the exhaust arm of the tank truck through a gas phase crane for exhausting the tank truck during filling, and a second end of the second pipeline is connected to a gas recovery device; a third pipeline, wherein a first end of the third pipeline is connected to the nitrogen storage tank, and a second end of the third pipeline is connected to the purge port of the tank truck, for introducing nitrogen into the tank truck; A first branch pipe, the first branch pipe is connected to the second pipeline through a three-way valve 1, and a negative pressure device is connected to the end of the first branch pipe; The second branch pipe has two ends connected to the first pipeline and the third pipeline respectively through a three-way valve 2 and a three-way valve 3.

2. The tank truck loading system according to claim 1, characterized in that: It also includes a gas filtering device, wherein the air inlet end of the gas filtering device is connected to the first branch pipe, and the air outlet end of the gas filtering device is connected to the negative pressure device.

3. The tank truck loading system according to claim 2, characterized in that: The tank truck loading system also includes a third branch pipe, a first end of the third branch pipe is connected to an end of the tank truck away from the purge port through a control valve, and a second end of the third branch pipe is connected to the second pipeline through a three-way valve four.

4. The tank truck loading system according to claim 3, characterized in that: It also includes a spring tube, the first end of which is connected to the third pipeline through a three-way valve 5, and the second end of the spring tube is provided with a purge gun.

5. The tank truck loading system according to claim 4, characterized in that: The three-way valve five and the three-way valve three are arranged in sequence along the flow direction of the nitrogen in the third pipeline.

6. The tank truck loading system according to claim 5, characterized in that: The first end of the spring tube is connected to the three-way valve 5 through a quick connector, and the second end of the spring tube is connected to the purge gun through a quick connector.

7. The tank truck loading system according to claim 6, characterized in that: The liquid phase crane pipe is connected to the tank truck's liquid adding arm via a low-temperature dry quick connector; the gas phase crane pipe is connected to the tank truck's exhaust arm via a low-temperature dry quick connector.

8. The tank truck loading system according to claim 7, characterized in that: The gas filtering device is provided with a filter cavity, and a filter element is provided in the filter cavity. The filter cavity is divided into two chambers by the filter element, one of the chambers is connected to the first branch pipe, and the other chamber is connected to the negative pressure device.

9. The tank truck loading system according to claim 8, characterized in that: The filter element is detachably connected to the filter cavity.

10. The tank truck loading system according to claim 1, characterized in that: It also includes a first pressure sensor, which is arranged on the first pipeline.

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