CN203671237U - Cryogenic liquefied gas transport vehicle and venting device - Google Patents

Abstract

The utility model provides a low temperature liquefied gas transport vechicle and venting device, venting device set up in low temperature liquefied gas transport vechicle, low temperature liquefied gas transport vechicle includes the container, venting device includes vent line, vent main valve and flowing back valve, vent line one end communicate in the inside of container, the other end have and communicate in external drain, vent main valve set up in vent line is last and be located inside the container, the flowing back valve sets up vent line is last, the flowing back valve can be opened with general liquid discharge in the vent line. The utility model discloses a low temperature liquefied gas transport vechicle and emptying devices's simple structure, the security performance is good, has prevented the frozen jam of drain effectively, makes container pressure stable, has avoided the potential safety hazard.

Description

Cryogenic liquefied gas transport vehicle and venting device

technical field

The utility model relates to a low-temperature liquefied gas transport vehicle and an emptying device. the

Background technique

Cryogenic liquefied gas is volatile and is usually transported by a special low-temperature liquefied gas vehicle. When transporting low-temperature liquefied gas, it is often necessary to evacuate the gas in the transport vehicle through the venting device equipped with the natural gas transport vehicle, that is, to release a part of the gasified low-temperature liquefied gas in the container to prevent excessive pressure in the container from causing the container to collapse. The safety valve trips, causing a fire or other hazard. In particular, for the common liquefied natural gas, it is an extremely flammable and explosive medium in low-temperature liquefied gas, which is easy to cause fire and explosion, and poses a great threat to personal and property safety. Therefore, when transporting liquefied natural gas, the venting device requirements are particularly high. the

One end of the vent device is connected to the inside of the container, and the vent port at the other end is connected to the atmosphere. Since the temperature of the low-temperature liquefied gas is still low after gasification, the natural gas escaping from the container through the pipeline of the venting device is easy to condense into ice when it encounters water vapor at the venting port, resulting in blockage of the venting port and resulting in pressure in the tank. If it rises, the safety valve of the container will jump, causing a safety hazard. the

Contents of the invention

The purpose of the utility model is to solve the deficiencies of the existing venting device of the natural gas transport vehicle, and provide a venting device and a low-temperature liquefied gas transport vehicle with reasonable structure, safety, reliability and convenience. the

In order to achieve the above purpose, an embodiment of the utility model proposes a venting device, the venting device is arranged in a low-temperature liquefied gas transport vehicle, the low-temperature liquefied gas transport vehicle includes a container, the venting device includes a venting pipeline, a venting assembly Valve and liquid discharge valve, one end of the vent pipeline is connected to the inside of the container, and the other end has a vent port connected to the outside world, the main vent valve is arranged on the vent pipeline and located inside the container , the liquid discharge valve is arranged on the discharge pipeline, and the liquid discharge valve can be opened to discharge the liquid in the discharge pipeline. the

In a preferred embodiment of the present invention, the low-temperature liquefied gas transport vehicle further includes an operation box, the operation box is arranged outside the container and is isolated from the container, and a part of the venting pipeline Located in the operating box, the drain valve is located in the operating box. the

In a preferred embodiment of the present invention, a part of the emptying pipeline forms a U-shaped bend, and the drain valve is connected to the emptying pipeline and is located in the U-shaped bend of the emptying pipeline. the lowest point of the bend. the

In a preferred embodiment of the present invention, the low-temperature liquefied gas transport vehicle further includes an operation box, the operation box is arranged outside the container, and is isolated from the container, and all the emptying pipelines The U-shaped bend is located in the operation box. the

In a preferred embodiment of the present invention, the opening diameter of the drain valve is equal to the opening diameter of the emptying pipeline. the

In a preferred embodiment of the present invention, the lowest point of the U-shaped bend of the emptying pipeline has an opening, and the liquid discharge valve is communicated with the opening. the

In a preferred embodiment of the utility model, the emptying pipeline further includes a connecting pipe, the connecting pipe is connected to the opening, and the liquid discharge valve is arranged on the connecting pipe. the

In a preferred embodiment of the present invention, the emptying pipeline includes a first pipeline and a second pipeline that are sealed and connected, and one end of the first pipeline is led out from the inside of the container and has a main valve for emptying, The second pipeline has a vent opening connected to the outside world, the other end of the first pipeline is in sealing connection with the lower part of the second pipeline, and the bottom of the second pipeline is provided with a connecting pipe and a drain valve . the

In a preferred embodiment of the utility model, the venting device further includes a flame arrester, the flame arrester is arranged on the venting pipeline, and is located between the main venting valve and the liquid discharge valve. the

The utility model also proposes a low-temperature liquefied gas transport vehicle, which includes a container, an operation box and the above-mentioned venting device. the

In a preferred embodiment of the present invention, the low-temperature liquefied gas transport vehicle is a liquefied natural gas tanker, and the container is a tank body. the

It can be seen from the above that in the low-temperature liquefied gas transport vehicle and the venting device of the present invention, the liquid discharge valve can be opened to discharge accumulated water during the venting operation, so as to ensure that there is no accumulated water in the venting pipeline and perform effective venting. the

The low-temperature liquefied gas transport vehicle and its venting device of the utility model are simple in structure, safe and reliable, and easy to use, effectively prevent the venting pipeline from freezing and blocking, stabilize the pressure of the container, avoid potential safety hazards, and ensure the safety of the low-temperature liquefied gas The transport vehicle is safely emptied without occupying the inner space of the operation box. the

Description of drawings

FIG. 1 is a schematic diagram of a low-temperature liquefied gas transport vehicle and a venting device according to a first embodiment of the present invention. the

FIG. 2 is a schematic diagram of a low-temperature liquefied gas transport vehicle and a venting device according to a second embodiment of the present invention. the

FIG. 3 is a schematic diagram of a low-temperature liquefied gas transport vehicle and a venting device according to a third embodiment of the present invention. the

FIG. 4 is a schematic diagram of a low-temperature liquefied gas transport vehicle and a venting device according to a fourth embodiment of the present invention. the

Detailed ways

FIG. 1 is a schematic diagram of a low-temperature liquefied gas transport vehicle and a venting device according to an embodiment of the present invention. As shown in FIG. 1 , the natural gas transport vehicle includes a container 1 for storing low-temperature liquefied gas. The natural gas transport vehicle also includes a venting device 3 , and the venting device 3 includes a venting pipeline 31 , a main venting valve 32 and a liquid discharge valve 33 . the

Wherein, one end of the vent pipeline 31 is located in the container 1 , and the other end has a vent, and the vent is connected to the outside world. The main vent valve 32 is connected to the vent pipeline 31 . The main venting valve 32 is usually set inside the container 1. When the venting pipeline 31 needs to be vented, the main venting valve 32 is opened, and the gas in the container 1 is discharged through the venting port connected to the outside world (such as the atmosphere), so as to reduce the pressure of the container. 1 internal pressure to prevent explosion. the

The vent pipeline 31 communicates with the inside of the container 1 and the outside of the natural gas transport vehicle. As shown in Figure 1, the venting pipeline 31 has a U-shaped bend, and the U-shaped bend forms a connector for gathering moisture from the external environment entering the venting pipe, or moisture attached to the wall of the venting pipeline 31 when the internal gas escapes. moisture. the

The drain valve 33 is arranged at the bottom of the U-shaped bend and communicates with the U-shaped bend of the emptying pipeline 31 . The drain valve 33 can be opened and closed. When the drain valve 33 is opened, the liquid at the bottom of the U-shaped bend can be discharged to the outside. When the drain valve 33 is closed, the liquid at the bottom of the U-shaped bend can be stored in the U-shaped bend. . the

In a preferred embodiment, the bottom of the U-shaped bend has an opening, and the venting device 3 also includes a connecting pipe 34, which is connected to the opening at the bottom of the U-shaped bending of the venting pipeline 31, and the drain valve 33 is arranged on the connecting pipe 34 On the upper side, it communicates with the venting pipeline 31 through the connecting pipe 34 . One end of the connecting pipe 34 is welded around the bottom opening of the U-shaped bend, and after welding, a seal is formed between the connecting pipe 34 and the opening. the

In other embodiments, the liquid discharge valve 33 may not be provided with a U-shaped bend, as long as it is in the form of a pipeline that can store a certain amount of liquid. The liquid discharge valve 33 is not limited to be arranged at the bottom of the U-shaped bend, but only needs to be arranged at the lowest position where liquid can be accumulated in the vent pipeline 31 . the

For example, as shown in Figure 2, in the venting device proposed by another embodiment of the present utility model, the venting pipeline 31 includes a first pipeline 311 and a second pipeline 312 that are hermetically connected, and one end of the first pipeline 311 is connected from Leading out of the container 1, the first pipeline 311 has a main vent valve 32, the second pipeline 312 has a vent port connected to the outside world, and the other end of the first pipeline 311 is in sealing connection with the lower part of the second pipeline 312. The bottom of the second pipeline 312 is provided with a connecting pipe 34 and a drain valve 33 . In this embodiment, the gas escaping from the first pipeline 311 can form liquid and accumulate to the bottom of the second pipeline 312, and be discharged through the liquid discharge valve. the

Some natural gas transport vehicles may also include an operation box 2 , which is arranged on the outer end of the head at one end of the container 1 and is isolated from the container 1 . A part of the emptying pipeline 31 is located in the operating box 2, and the U-shaped bend part of the emptying pipeline 31 can be located in the operating box 2, and the drain valve 33 is also arranged in the operating box 2. When the draining valve 33 is opened The liquid at the bottom of the U-shaped bend can be discharged into the operation box 2 . the

Fig. 3 and Fig. 4 are schematic diagrams of venting devices in two other embodiments of the present invention. As shown in Figure 3 and Figure 4, in the above two embodiments, the venting device 3 also includes a flame arrester 35, which is arranged between the main venting valve 32 and the venting port, usually inside the container, for realizing explosion-proof , The function of fire resistance. the

More specifically, as shown in Figure 3 and Figure 4, on the basis of the above two implementations, the flame arrester 35 is arranged close to the main vent valve 32, and is located at the position where the main vent valve 32 is set on the vent pipeline 31 and Set the position of the drain valve 33 between. the

An embodiment of the utility model further proposes a low-temperature liquefied gas transport vehicle, which includes a container 1 , an operation box 2 and an emptying device 3 . Wherein the emptying device 3 is the above-mentioned emptying device. the

In particular, the above-mentioned low-temperature liquefied gas transport vehicle is a liquefied natural gas tank vehicle, and the container 1 is preferably a tank body. the

It can be seen from the above that in the low-temperature liquefied gas transport vehicle and the venting device of the present invention, when performing the venting operation, the main venting valve is opened, and the liquid discharge valve can be opened before and after the main venting valve is opened to discharge liquid to ensure venting. There is no accumulated water in the pipeline, so that it can be effectively vented. the

The low-temperature liquefied gas transport vehicle and its venting device of the utility model are simple in structure, safe and reliable, and easy to use, effectively preventing the vent port from freezing and blocking, making the pressure of the container stable, avoiding potential safety hazards, and ensuring the transportation of low-temperature liquefied gas The car is safely emptied without occupying the inner space of the operation box. the

While the invention has been described with reference to a few exemplary embodiments, it is understood that the words which have been used are words of description and illustration, rather than of limitation. Since the present invention can be embodied in various forms without departing from the spirit or essence of the present invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be within the spirit and scope of the appended claims. Broadly interpreted, all changes and modifications that come within the scope of the claims or their equivalents are therefore intended to be covered by the appended claims. the

Claims (11)

1. A venting device, installed in a low-temperature liquefied gas transport vehicle, the low-temperature liquefied gas transport vehicle includes a container (1), characterized in that the venting device (3) includes a venting pipeline (31), a venting Main valve (32) and drain valve (33), one end of the venting pipeline (31) is connected to the inside of the container (1), and the other end has a vent port connected to the outside world, the main venting valve ( 32) Set on the emptying pipeline (31) and inside the container (1), the drain valve (33) is set on the emptying line (31), the drain valve (33) can be opened to discharge liquid in said vent line (31). the 2. The venting device according to claim 1, characterized in that, the low-temperature liquefied gas transport vehicle further comprises an operation box (2), and the operation box (2) is arranged outside the container (1), and It is isolated from the container (1), a part of the emptying pipeline (31) is located in the operation box (2), and the drain valve (33) is located in the operation box (2). the 3. The venting device according to claim 1, characterized in that, a part of the venting pipeline (31) forms a U-shaped bend, and the drain valve (33) is connected to the venting pipeline (31 ), and located at the lowest point of the U-shaped bend of the vent pipeline (31). the 4. The venting device according to claim 3, characterized in that, the low-temperature liquefied gas transport vehicle further comprises an operation box (2), and the operation box (2) is arranged outside the container (1), and It is isolated from the container (1), and the U-shaped bend of the venting pipeline (31) is located in the operation box (2). the 5. The venting device according to claim 3, characterized in that, the opening diameter of the drain valve (33) is equal to the opening diameter of the venting pipeline (31). the 6. The venting device according to claim 3, characterized in that, the lowest point of the U-shaped bend of the venting pipeline (31) has an opening, and the drain valve (33) communicates with the opening . the 7. The venting device according to claim 6, characterized in that, the venting pipeline (31) further includes a connecting pipe (34), the connecting pipe (34) is connected to the opening, and the drain valve (33) is arranged on the connecting pipe (34). the 8. The venting device according to claim 1, characterized in that, the venting pipeline (31) includes a first pipeline (311) and a second pipeline (312) that are sealed and connected, and the first pipeline One end of the pipeline (311) is drawn from the inside of the container (1) and has a main vent valve (32), the second pipeline (312) has a vent port connected to the outside world, and the first pipeline (311) The other end of the second pipeline (312) is sealingly connected with the lower part of the second pipeline (312), and the bottom of the second pipeline (312) is provided with a connecting pipe (34) and a drain valve (33). the 9. The venting device according to claim 1, characterized in that, the venting device (3) further comprises a flame arrester (35), and the flame arrester (35) is arranged on the venting pipeline (32) , and located between the main vent valve (31) and the drain valve (33). the 10. A low-temperature liquefied gas transport vehicle, characterized by comprising a container (1), an operation box (2) and an emptying device (3) according to claims 1-9. the 11. The low-temperature liquefied gas transport vehicle according to claim 10, characterized in that, the low-temperature liquefied gas transport vehicle is a liquefied natural gas tanker, and the container (1) is a tank body. the

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