CN206449404U - A kind of natural gas recycling system - Google Patents

Abstract

The utility model relates to a natural gas recycling system capable of collecting and using the LNG automatically discharged from an LNG storage tank, including the LNG storage tank, which is characterized in that the first output pipeline of the LNG storage tank is connected with a high-pressure gas cylinder, and the The second output pipeline of the high-pressure gas cylinder is connected with a booster pump, the third output pipeline of the booster pump is connected with a gasifier, and the fourth output pipeline of the gasifier is connected with a gas engine. The utility model has a simple structure. It is easy to operate, low in cost and can effectively utilize the natural gas discharged from the long-term idle LNG storage tank.

Description

A natural gas recycling system

technical field

The utility model relates to a natural gas recycling system capable of collecting and using the LNG automatically discharged from an LNG storage tank.

Background technique

Existing LNG ships need to carry a large number of LNG storage tanks during long-distance transportation. When manufacturing LNG storage tanks, a safe take-off pressure (generally 1.3MPa) will be set. When the pressure inside the LNG storage tank exceeds the take-off pressure, the LNG The storage tank will automatically discharge part of the LNG, so that the pressure of the LNG storage tank will always be kept below the safe take-off pressure, and avoid leakage or explosion due to excessive pressure in the LNG storage tank.

When the LNG in the LNG storage tank is completely converted into CNG, the volume will expand by 625 times. According to statistics, when the average daytime temperature is 17°C, if the LNG ship is transported for a long distance, when the LNG storage tank has been idle for more than 30 days, the inside of the tank will The LNG will be reduced to 10% of the original, and the waste is particularly serious.

The prior art has not yet made an effective use of this part of the waste, so a natural gas recycling system that can collect and use the LNG that is automatically discharged from the LNG storage tank is needed in this field.

Utility model content

(1) Solved technical problems

The utility model provides a natural gas recycling system capable of collecting and using the LNG automatically discharged from an LNG storage tank, so as to solve the problems in the background technology.

(2) Technical solution

In order to achieve the above purpose, the utility model is realized through the following technical solutions: a natural gas recovery and utilization system, comprising an LNG storage tank, characterized in that the first output pipeline of the LNG storage tank is connected with a high-pressure gas cylinder, and the high-pressure The second output pipeline of the gas cylinder is connected to a booster pump, the third output pipeline of the booster pump is connected to the gasifier, and the fourth output pipeline of the gasifier is connected to the gas engine.

Preferably, the inside of the high-pressure gas cylinder includes guide rods located on both sides, a piston passing through the guide rod and cooperating with the high-pressure gas cylinder, and a piston located at the upper end of the high-pressure gas cylinder and cooperating with the piston. Varistor.

Preferably, the natural gas recovery and utilization system also includes an alarm system, the alarm system is connected to the piezoresistor, and the alarm device is set outside the high-pressure gas cylinder. When it is set inside the high-pressure gas cylinder, due to the existence of the power supply, It is easy to cause dangerous accidents and should not be selected. When the piston reaches the piezoresistor, the alarm device will work to remind the staff to pay attention to the need to use the natural gas inside the high-pressure gas cylinder.

(3) Beneficial effects

The utility model provides a natural gas recovery and utilization system, which has the remarkable advantage that a high-pressure gas cylinder is added to the first output pipeline end of a number of idle and standby LNG storage tanks, and when the pressure in the LNG storage tank exceeds the safe take-off pressure, automatic The exhaust gas enters the high-pressure gas cylinder. Note: it will only be output from the first output pipeline of the LNG storage tank. The gas enters the booster pump along the second output pipeline of the high-pressure gas cylinder. After the booster pump works, it is discharged into the vaporizer. The gasifier is discharged into the gas engine to work, avoiding unnecessary waste. In addition, the utility model also discloses a structure of a high-pressure gas cylinder. The piston at the bottom of the high-pressure gas cylinder moves up along the guide rod as the gas enters. When the piston touches the piezoresistor, the alarm device works to remind the staff that the high-pressure gas tank is full. The utility model has the advantages of simple structure, easy operation, low cost and can effectively discharge the natural gas inside the long-term idle LNG storage tank. use efficiently.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the internal structure diagram of the utility model high-pressure gas tank;

Fig. 3 is a schematic diagram of the cooperation between the moving up of the piston of the high-pressure gas tank of the utility model and the piezoresistor;

In the figure: LNG storage tank 1, first output pipeline 2, high-pressure gas cylinder 3, booster pump 4, third output pipeline 5, gasifier 6, gas engine 7, second output pipeline 8, fourth output pipeline 9 , bump 10, guide rod 31, piston 32, piezoresistor 33.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

As shown in Figure 1-3, a natural gas recycling system includes an LNG storage tank 1, characterized in that the first output pipeline 2 of the LNG storage tank 1 is connected to a high-pressure gas cylinder 3, and the first output pipeline 2 of the high-pressure gas cylinder 3 The second output pipeline 8 is connected to a booster pump 4 , the third output pipeline 5 of the booster pump 4 is connected to the gasifier 6 , and the fourth output pipeline 9 of the gasifier 6 is connected to the gas engine 7 .

Preferably, the inside of the high-pressure gas cylinder 3 includes guide rods 31 on both sides, a piston 32 passing through the guide rods 31 and cooperating with the high-pressure gas cylinder 3 , and a piston 32 located at the upper end of the high-pressure gas cylinder 3 and connected to the high-pressure gas cylinder 3. The piston 32 cooperates with a piezoresistor 33 .

Preferably, the natural gas recovery and utilization system also includes an alarm system (not shown in the figure), the alarm system is connected with the piezoresistor 33, and the alarm device is arranged outside the high-pressure gas cylinder 3, and is arranged on the high-pressure gas cylinder. Inside the bottle 3, due to the existence of the power supply, dangerous accidents are likely to occur, so it is not suitable to choose. When the piston 32 pushes against the piezoresistor 33, the alarm device will work, reminding the staff to pay attention to the need to use the natural gas inside the high-pressure gas cylinder 3 .

The piezoresistor 33 is installed on the top of the high-pressure gas cylinder and connected with the insulated bump 10 of the high-pressure gas cylinder 3. One of the wires of the piezoresistor 33 is connected with the high-pressure gas cylinder 3, and the other is connected with the bump 10. One end of the alarm device It is connected to the high-pressure gas cylinder 3, and the other end is connected to the bump 10. Since the bump 10 is insulated from the high-pressure gas cylinder 3, when the piston 32 pushes against the piezoresistor 33, the two wires of the piezoresistor 33 are connected. , the alarm device works at this time.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. without further restrictions. The phrase "the inclusion of an element defined by ... does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising said element". Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes and modifications can be made to these embodiments without departing from the principle and spirit of the present invention , replacements and modifications, the scope of the present utility model is defined by the appended claims and their equivalents.

Claims (3)

1. A natural gas recycling system, comprising an LNG storage tank, characterized in that the first output pipeline of the LNG storage tank is connected with a high-pressure gas cylinder, and the second output pipeline of the high-pressure gas cylinder is connected with a booster pump, The third output pipeline of the booster pump is connected to the gasifier, and the fourth output pipeline of the gasifier is connected to the gas engine. 2. The natural gas recycling system according to claim 1, wherein the inside of the high-pressure gas cylinder includes guide rods on both sides, a piston passing through the guide rod and cooperating with the high-pressure gas cylinder, and A piezoresistor located at the upper end of the high-pressure cylinder and cooperating with the piston. 3. The natural gas recovery and utilization system according to claim 2, characterized in that, the natural gas recovery and utilization system further comprises an alarm system connected to the piezoresistor.