CN105020572A - Skid-mounted gas station - Google Patents

Abstract

The invention provides a skid-mounted gas station which comprises a bottom frame, a storage tank, an unloading system, a pump pool, an immersed pump, at least one gas dispenser and a supercharger. The supercharger is provided with a supercharging air return pipe and a supercharging liquid phase pipe. The pressurizing air return pipe is respectively communicated with the unloading air return port and the inner container, the pressurizing liquid phase pipe is respectively communicated with the unloading pressurizing port and the immersed pump, and the unloading liquid phase port is communicated with the inner container. The storage tank, the gas dispenser and the supercharger are all fixed on the bottom frame, liquid in the tank car enters the supercharger through the unloading supercharging port and the supercharging liquid phase pipe, the liquid returns to the tank car through the supercharging return air pipe and the unloading return air port after being supercharged and gasified through the supercharger to complete supercharging, and the liquid in the tank car enters the inner container of the storage tank through the unloading liquid phase port to complete unloading. The skid-mounted gas station provided by the invention can be assembled and debugged in a factory, and can be put into use after the through hole is fixed by the fixing bolt and the like after being transported to the site, so that the gas station can quickly enter a liquid unloading state, and the construction and liquid unloading efficiency of the gas station are improved.

Description

Skid-mounted gas station

technical field

The invention relates to the technical field of liquefied natural gas, and particularly designs a gas filling station for liquefied natural gas.

Background technique

At present, the existing LNG refueling stations have complex structures, are not well adaptable to site requirements, have a large installation workload and are not easy to move, which have become important factors restricting the development of LNG refueling stations.

For example, the Chinese invention patent, publication number 202203660U, proposes a liquefied natural gas container refueling station, which includes a container frame, a liquefied natural gas storage tank and a refueling device fixed inside the container frame. In this technical solution, the storage tank and the gas filling device required by the traditional gas filling station are arranged in the container frame, so that the gas filling station is easy to move, but the structure of the gas filling station is relatively complicated, and GB50156-2012 stipulates that LNG gas filling The fire distance between the machine and the pump pool must meet the requirement of 4m, and the container-type gas filling station cannot meet the standard requirements, and the volume of the skid-mounted storage tank is small, and the volume of the largest skid-mounted storage tank on the market is only 30m ³ , Not only that, the container gas filling station can only be used after it needs to be wired and powered on on site. Moreover, in the process of use, the submersible pump needs to be pre-cooled before the liquid discharge function can be completed, the use steps are cumbersome, and the gas filling efficiency is low.

Therefore, to provide an integrated gas filling station, especially a skid-mounted gas filling station, which meets the LNG gas filling demand, does not need to pre-cool the submersible pump, and has a small installation workload and is easy to move has become an important issue in the industry. A major technical problem that needs to be solved urgently.

Contents of the invention

The invention aims to solve the technical problems in the prior art that the liquefied natural gas filling station is inconvenient to move and put into use slowly.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A skid-mounted gas filling station proposed by the present invention is used for pressurizing tank cars, unloading cars, and adding liquid to car bottles. The skid-mounted gas filling station includes a bottom frame, a storage tank, an unloading system, a pump pool, a submersible pump arranged inside the pump pool, and at least one gas dispenser connected to the storage tank and the submersible pump. The storage tank includes an outer container and an inner container, wherein the skid-mounted gas filling station also includes a supercharger, the supercharger has a pressurized return pipe and a pressurized liquid phase pipe, and the pressurized return pipes are respectively It communicates with the unloading air return port and the inner container, the pressurized liquid phase pipe communicates with the unloaded booster port and the submersible pump respectively, the unloading liquid phase port communicates with the inner container, and the storage The tank, the gas filling machine and the supercharger are all fixed on the bottom frame, the liquid in the tank car enters the supercharger, and returns to the tank car after being pressurized and gasified. The pressurization is completed, the liquid in the tank car enters the inner container of the storage tank, and the unloading is completed, and the liquid in the storage tank returns to the storage tank after being pressurized and gasified by the supercharger, and the storage tank is completed. Self-pressurization, so that its internal pressure is greater than the pressure in the vehicle bottle, and is used to add liquid to the vehicle bottle.

According to an embodiment of the present invention, there is a interlayer space between the inner container and the outer container, the pump pool is arranged in the interlayer space and the upper end of the pump pool protrudes from the storage tank, so The pump pool communicates with the inner container.

According to another embodiment, the skid-mounted gas filling station also includes supporting pipelines and liquid outlet pipes, each of the gas filling machines includes a gas filling machine return pipe and a gas filling machine liquid phase pipe, and the gas filling machine The air return pipe communicates with the inner container through the supporting pipeline, and the liquid phase pipe of the gas dispenser communicates with the submerged pump through the liquid outlet pipe.

According to another embodiment, the skid-mounted gas filling station further includes a balance pipe connected between the supporting pipeline and the liquid outlet pipe, used for filling the vehicle bottle with liquid from the gas dispenser The liquid remaining in the liquid outlet pipe and the liquid phase pipe of the aerator is returned to the inner container.

According to another embodiment, the storage tank further includes a top liquid inlet pipe and a bottom liquid inlet pipe connected to the bottom end and the top end of the inner container respectively, and the top liquid inlet pipe and the bottom liquid inlet pipe The pipe is connected to the liquid phase port of the unloading vehicle and the supporting pipeline.

According to another embodiment, the skid-mounted gas filling station further includes a safety release system connected to the storage tank for depressurizing the storage tank, the safety release system includes a safety release pipeline, the The safety release pipeline is connected to the inner container.

According to another embodiment, the safety release system further includes a heater communicated with the safety release pipeline and a vent pipe communicated with the heater, the heater is used to heat the gas discharged from the storage tank, And discharge the gas through the vent pipe.

According to another embodiment, the heater is an EAG heater.

According to another embodiment, the storage tank further includes a gas phase pipe, one end of which is connected to the inner container, and the other end is connected to the pressurized air return pipe and the unloading air return port.

According to another embodiment, the safety release pipeline is connected to the gas phase pipe.

It can be seen from the above technical scheme that the skid-mounted gas filling station proposed by the present invention, the supercharger is set to realize the functions of supercharging the tank car, unloading the car and filling the vehicle bottle through the gas filling station, and the tank car does not need Self-pressurization. The skid-mounted gas filling station proposed by the present invention can be assembled and debugged in the factory, and after being transported to the site, the through hole can be put into use after being fixed by fixing bolts, etc., and the gas filling station can quickly enter the state of waiting to be unloaded, improving the The construction of filling station and the unloading efficiency.

Description of drawings

Fig. 1 is the structural representation of the skid-mounted gas filling station that the present invention proposes;

Fig. 2 is a working principle diagram of the skid-mounted gas filling station proposed by the present invention.

Wherein, the reference signs are explained as follows:

1. storage tank; 10. outer container; 11. inner container; 12. bottom liquid inlet pipe; 13. top liquid inlet pipe; 14 gas phase pipe; Gas engine liquid phase pipe; 30. Unloading booster port; 31. Unloading gas return port; 32. Unloading liquid phase port; 40. Pump pool; 41. Submersible pump; 5. Supercharger; 50. Booster return air pipe; 51. Pressurized liquid phase pipe; 6. Safety release system; 60. Safety release pipeline; 61. Heater; 62. Vent pipe; 7. Supporting pipeline; 8. Liquid outlet pipe; 78. Balance pipe; 9 . Bottom frame.

Detailed ways

Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and that the descriptions and illustrations therein are illustrative in nature and not intended to limit the present invention. invention.

The present invention proposes a skid-mounted gas filling station, which is mainly used to pressurize the tank car when the internal pressure of the tank car is equal to or Unloading and adding liquid to the vehicle bottle when the internal pressure of the storage tank 1 is greater than that of the vehicle bottle. Taking a tanker for transporting liquefied natural gas (LNG) as an example, the tanker has an unloading booster port 30 , an unloading gas return port 31 and an unloading liquid phase port 32 . The skid-mounted gas filling station proposed by the present invention mainly includes a bottom frame 9 , a storage tank 1 , a pump pool 40 , a submersible pump 41 , a supercharger 5 and at least one gas filling machine 2 .

Implementation

An embodiment of the skid-mounted gas filling station proposed by the present invention. As shown in Figures 1 and 2, in this embodiment, the skid-mounted gas station mainly includes a storage tank 1, a pump pool 40, a submersible pump 41, a supercharger 5, two gas dispensers 2 and safety Diffuse system6. As shown in FIG. 2 , the above-mentioned process equipments and the process piping systems and other instrument control systems connected between the process equipments are all skid-mounted on a bottom frame 9 . In addition, each process equipment, process piping system and instrument control system are highly integrated, with reasonable structural layout, convenient installation, easy overall movement and quick put into use, and can be used as a temporary gas filling station or a permanent gas filling station. In addition, since each part of the present invention is skid-mounted on a bottom frame 9, the skid-mounted gas station proposed by the present invention can be assembled and debugged in the factory without on-site commissioning. After the assembly and commissioning, it can be directly transported. At the work site, it can be quickly put into use by fixing fixed parts such as fixing bolts, and the gas filling station can quickly enter the state of waiting for unloading, improving the construction and unloading efficiency of the gas filling station.

As shown in FIG. 2 , in this embodiment, the storage tank 1 includes an outer container 10 and an inner container 11 , and there is a interlayer space between the inner container 11 and the outer container 10 . The storage tank 1 also includes a top liquid inlet pipe 13 , a bottom liquid inlet pipe 12 and a gas phase pipe 14 . One end of the top liquid inlet pipe 13 extends into the upper part of the inner container 11, one end of the bottom liquid inlet pipe 12 extends into the inner container 11 and extends to the bottom thereof, and one end of the gas phase pipe 14 communicates with the inner top of the inner container 11 , and the other end communicates with the unloading air return port 31 of the tanker. In addition, in order to maximize the capacity of the storage tank 1 to store LNG, in this embodiment, the volume of the storage tank 1 is 54m ³ . On the basis of complying with national laws and regulations, the capacity of the storage tank 1 is maximized and the storage capacity is improved. efficiency and improved economy.

As shown in Figure 2, in this embodiment, the pump pool 40 is arranged in the interlayer space between the inner container 11 and the outer container 10, the upper end of the pump pool 40 protrudes from the outer container 10, and the pump pool 40 and the inner container 11 are communicated by pipelines. Specifically, the pipe connecting the pump pool 40 and the inner container 11 is the bottom liquid outlet pipe 15, and the bottom liquid outlet pipe 15 communicates with the bottom of the inner container 11 and the pump pool 40, but it is not limited thereto. In addition, the submersible pump 41 is disposed in the pump pool 40 , and the height of the submersible pump 41 is lower than the bottom surface of the inner container 11 , but not limited thereto. Compared with the existing gas filling station, the structure of this storage tank with pump does not need to pre-cool the submersible pump before using it. In this embodiment, since the submersible pump 41 and the pump pool 40 are arranged in the inner container 11 and the outer container 10 in the interlayer space can maintain a lower temperature consistently, so that the skid-mounted gas filling station can quickly enter the state of liquid to be unloaded without precooling the submersible pump, which greatly improves the gas filling efficiency. The speed of putting the station into use has further improved the work efficiency of unloading and filling the car bottles.

As shown in FIG. 2 , in this embodiment, the supercharger 5 has a pressurized return pipe 50 and a pressurized liquid phase pipe 51 . One end of the pressurized air return pipe 50 communicates with the unloaded air return port 31 . In addition, the pressurized air return pipe 50 is also connected to the gas phase pipe 14 of the storage tank 1 , that is, it communicates with the inner container 11 through the gas phase pipe 14 . One end of the pressurized liquid phase pipe 51 is connected to the unloading booster port 30. In addition, the pressurized liquid phase pipe 51 is also connected to the submersible pump 41. Similarly, the above connection structure can also be realized through existing valves and related pipelines, but It is not limited to this.

As shown in FIG. 2 , each gas dispenser 2 has a gas dispenser return pipe 20 and a gas dispenser liquid phase pipe 21 . The air return pipe 20 of the dispenser communicates with the top liquid inlet pipe 13 and the bottom liquid inlet pipe 12 through a matching pipeline 7 . The liquid phase pipe 21 of the gas dispenser communicates with the pressurized liquid phase pipe 51 and the submersible pump 41 through a liquid outlet pipe 8 . The above communication structure can be realized through existing valves and related pipelines, but is not limited thereto.

In addition, as shown in FIG. 2 , the matching pipeline 7 communicates with the outlet pipe 8 through a balance pipe 78 . It is used to return the liquid remaining in the liquid outlet pipe 8 and the liquid phase pipe 21 of the gas dispenser to the inner container 11 after the gas dispenser 2 liquidizes the vehicle bottle.

As shown in FIG. 2 , the safety release system 6 includes a safety release pipeline 60 , a heater 61 and a vent pipe 62 . The heater 61 is communicated with the gas phase pipe 14 through the safety relief pipeline 60 , that is, communicated with the inner container 11 through the gas phase pipe 14 , and is used for releasing gas after heating when the pressure of the storage tank 1 reaches the opening pressure of the safety valve. Heater 61 can select EAG (Escape Air Gas) heater 61 for use, but not limited to this. The vent pipe 62 communicates with the heater 61 for discharging the vent gas heated by the heater 61 .

In this embodiment, the skid-mounted gas station is assembled and debugged in the factory, and then transported to the work site and fixed on the ground or on the work platform by fixing parts such as fixing bolts, and then it can be put into use immediately. The main functions that can be realized are to pressurize the tank car, unload the car and add liquid to the car bottle.

In this embodiment, before unloading, if the pressure inside the tank car is less than or equal to the pressure of the storage tank 1, the tank car can be pressurized through the supercharger 5 and related pipelines. Specifically, after the tank car enters, the liquid in the tank car enters the supercharger 5 through the pressurized liquid phase pipe 51 through the unloading booster port 30, and the supercharger 5 heats and pressurizes the liquid to gasify and become gas, and then the gas Return to the tank car through the pressurized air return pipe 50 from the unloading air return port 31, so that the pressure in the storage tank of the tank car is greater than the pressure of the storage tank 1, that is, the pressurization of the tank car is completed. After the pressurization of the tank car is completed, or when the pressure inside the tank car is already greater than the pressure in the storage tank 1, the liquid in the tank car enters the content evenly from the unloading liquid phase port 32 through the top liquid inlet pipe 13 and the bottom liquid inlet pipe 12 In the device 11, the function of unloading is realized.

When adding liquid to the vehicle bottle, the pressure inside the vehicle bottle also needs to be adjusted, that is, the pressure inside the vehicle bottle needs to be adjusted to be lower than the pressure of the storage tank 1 . Specifically, after the vehicle bottle is connected to the gas dispenser 2, the gas in the vehicle bottle enters the inner container 11 through the gas dispenser return pipe 20 to achieve the function of releasing the pressure of the vehicle bottle, so that the gas in the storage tank 1 The liquid enters the vehicle bottle more easily through the gas dispenser 2 . In addition, when the pressure in the storage tank 1 is lower than the corresponding standard, for example, when it is lower than 0.4 MPa, the storage tank 1 needs to be further pressurized. At this time, the pressurized liquid phase pipe 51 can be opened, and the inner container 11 can be pumped by the submersible pump 41. The internal liquid is pumped into the supercharger 5 through the pressurized liquid phase pipe 51. After the supercharger 5 pressurizes the liquid and gasifies it into gas, the gas is returned to the content through the pressurized return gas pipe 50 through the gas phase pipe 14. After the pressure in the vehicle bottle is lower than the pressure of the storage tank 1, the liquid can be added to the vehicle bottle. Specifically, the previously opened pressurized liquid phase pipe 51 is closed, and then the liquid in the inner container 11 is pumped into the gas filling machine 2 by the submersible pump 41 through the liquid outlet pipe 8, and then filled into the vehicle through the gas filling machine 2. bottle, complete the filling of the car bottle. In addition, after the filling of the vehicle bottle is completed, the balance pipe 78 is opened to allow the liquid remaining in the pipeline to return to the inner container 11 through the balance pipe 78 .

In addition, when the pressure in the storage tank 1 is too high, the storage tank 1 needs to be depressurized. That is, the gas in the inner container 11 enters the safety release system 6 through the gas phase pipe 14 to be discharged. Specifically, when the pressure of the inner container 11 of the storage tank 1 is too high, the high-pressure gas in the inner container 11 enters the heater 61 from the gas phase pipe 14 through the safety release pipeline 60, and these gases are heated by the heater 61 and then passed through the vent. The pipe 62 is discharged to empty, that is, the pressure relief of the storage tank 1 is completed.

While the skid-mounted gas station of the present invention has been described with reference to several exemplary embodiments, it is to be understood that the terms which have been used are illustrative and exemplary, rather than limiting. Since the invention can be embodied in various forms without departing from its concept or essence, the above-described embodiments are not limited to any of the foregoing details, but should be construed broadly within the spirit and scope of the appended claims. All changes and modifications within the scope of the claims or their equivalents should be covered by the appended claims.

Claims (10)

1. A skid-mounted gas filling station, which is used for pressurizing and unloading a tank car and adding liquid to a car bottle. Phase port (32), the skid-mounted gas filling station includes a bottom frame (9), a storage tank (1), an unloading system, a pump pool (40), and a submersible pump arranged inside the pump pool (40) (41) and at least one gas dispenser (2) communicated with the storage tank (1) and the submersible pump (41), the storage tank (1) includes an outer container (10) and an inner container (11), It is characterized in that the skid-mounted gas filling station also includes a supercharger (5), the supercharger (5) has a pressurized return pipe (50) and a pressurized liquid phase pipe (51), and the booster The pressure return air pipe (50) communicates with the unloading air return port (31) and the inner container (11) respectively, and the pressurized liquid phase pipe (51) is respectively connected with the unloading pressurization port (30) and the submerged liquid The pump (41) is connected, the unloading liquid phase port (32) is connected with the inner container (11), the storage tank (1), the gas filling machine (2) and the supercharger (5) are all fixed on the bottom frame (9), the liquid in the tank car enters the supercharger (5), and returns to the tank car after being pressurized and gasified to complete the pressurization, and the tank car The liquid in the vehicle enters the inner container (11) of the storage tank (1) to complete unloading, and the liquid in the storage tank (1) is pressurized and vaporized by the supercharger (5) and returns to the storage tank (1), complete the self-pressurization of the storage tank (1), so that its internal pressure is greater than the pressure in the vehicle bottle, and is used to add liquid to the vehicle bottle. 2. The skid-mounted gas filling station according to claim 1, characterized in that there is an interlayer space between the inner container (11) and the outer container (10), and the pump pool (40) is arranged in The upper end of the pump pool (40) in the interlayer space protrudes from the storage tank (1), and the pump pool (40) communicates with the inner container (11). 3. The skid-mounted gas filling station according to claim 1, characterized in that, the skid-mounted gas filling station also includes supporting pipelines (7) and liquid outlet pipes (8), and each of the gas filling stations The machine (2) includes a gas filling machine return pipe (20) and a gas filling machine liquid phase pipe (21), and the gas filling machine return pipe (20) passes through the supporting pipeline (7) and the inner container (11) ) is communicated, and the liquid phase pipe (21) of the gas dispenser is communicated with the submerged pump (41) through the liquid outlet pipe (8). 4. The skid-mounted gas filling station according to claim 3, characterized in that, the skid-mounted gas filling station further includes a connection between the supporting pipeline (7) and the liquid outlet pipe (8). The balance pipe (78) between them is used for adding liquid to the vehicle bottle by the gas dispenser (2) and remaining in the liquid outlet pipe (8) and the liquid phase pipe (21) of the gas dispenser The liquid flows back into said inner vessel (11). 5. The skid-mounted gas filling station according to claim 3, characterized in that, the storage tank (1) further includes top inlets connected to the bottom end and the top end of the inner container (11) respectively. The liquid pipe (12) and the bottom liquid inlet pipe (13), the top liquid inlet pipe (12) and the bottom liquid inlet pipe (13) are jointly connected to the unloading liquid phase port (32) and the supporting pipe Road (7). 6. The skid-mounted gas filling station according to claim 1, characterized in that, the skid-mounted gas filling station also includes a safety release system (6) connected to the storage tank (1) for The storage tank (1) performs pressure relief, and the safety relief system (6) includes a safety relief pipeline (60), and the safety relief pipeline (60) is communicated with the inner container (11). 7. The skid-mounted gas filling station according to claim 6, characterized in that, the safety release system (6) also includes a heater (61) communicated with the safety release pipeline (60) and a heater (61) connected to the safety release pipeline (60). The vent pipe (62) connected with the heater (61), the heater (61) is used to heat the gas discharged from the storage tank (1), and discharge the gas through the vent pipe (62) . 8. The skid-mounted gas filling station according to claim 7, characterized in that, the heater (61) is an EAG heater. 9. The skid-mounted gas filling station according to claim 1, characterized in that, the storage tank (1) further comprises a gas phase pipe (14), and one end of the gas phase pipe (14) communicates with the inner container ( 11), the other end communicates with the pressurized air return pipe (50) and the unloaded air return port (31). 10. The skid-mounted gas filling station according to claim 6 or 9, characterized in that, the safety release pipeline (60) is connected to the gas phase pipe (14).