CN205535043U - Natural gas liquid presses sub -station and unload gas system thereof - Google Patents

Abstract

The utility model provides a natural gas liquid presses sub -station and unload gas system thereof, natural gas liquid press the gas system of unloading of sub -station to include: the buffering splitter, the buffering splitter is through unloading air pipe and sub -station car intercommunication, the buffering splitter can with the natural gas that the sub -station car was carried carries out gas -liquid separation and carries out the gas -liquid monitoring, wherein, the buffering splitter includes: gaseous buffering separator tube, liquid buffering separator tube and gas -liquid monitoring devices, gaseous buffering separator tube is located the top of liquid buffering separator tube, just the lower extreme interface of gaseous buffering separator tube with the upper end interface of liquid buffering separator tube links to each other, gas -liquid monitoring devices sets up gaseous buffering separator tube with the hookup location of liquid buffering separator tube is used for monitoring hookup location's gas -liquid state. The utility model discloses simple structure has gone on upgrading at present equipment and has reformed transform, and the feasibility is high, can directly carry out the tube coupling, has reduced manpower and materials.

Description

Natural gas hydraulic substation and its unloading system

technical field

The utility model relates to the field of pressurization of compressed natural gas, in particular to an unloading structure of a natural gas hydraulic substation.

Background technique

At present, the unloading method of the CNG hydraulic substation is usually to directly fill the special liquid into the gas storage cylinder of the CNG trailer through the hydraulic pump, push out the CNG in the cylinder, and then fill the CNG into the car's gas cylinder through the gas filling machine Inside.

Summarizing the accident analysis of the hydraulic substation for ten years of operation, the most widely affected problem of the hydraulic substation is: injecting liquid media such as hydraulic oil into the natural gas vehicle during the gas filling process, causing the natural gas vehicle to fail to brake and damage the vehicle system The reason for this situation is that the liquid medium such as hydraulic oil is injected into the gas storage cylinder of the natural gas vehicle due to the poor natural gas separation and filtration effect of the hydraulic sub-station transport vehicle (referred to as "sub-station vehicle").

Fig. 1 and Fig. 2 show the structure of the existing CNG hydraulic sub-station unloading pipeline. Currently, CNG hydraulic sub-station devices on the market usually have one or more natural gas cylinders 10 on the unloading pipeline. Natural gas is discharged from the front end A' of the large-capacity steel cylinder of the sub-station car, delivered to the natural gas cylinder 10 installed in the hydraulic skid, and then separated and filtered, then delivered to the gas filling machine in the natural gas filling station. High-pressure natural gas is injected into the gas cylinder of the natural gas vehicle to refill the vehicle. The natural gas cylinders in this structure are special equipment, and the management methods are different in different places. The local quality supervision bureaus have deviations in the implementation of national standards, which makes it difficult for many users to go through the formalities.

Utility model content

In order to solve the above technical problems, the utility model is to provide a natural gas hydraulic substation and its unloading system to solve the problems in the prior art that the liquid medium is easily injected into the target container.

Aiming at the above-mentioned technical problems, the utility model proposes an unloading system of a natural gas hydraulic substation, including: a buffer separation device, the buffer separation device communicates with the substation vehicle through an unloading pipeline, and the buffer separation device can transfer the Gas-liquid separation and gas-liquid monitoring are carried out on the natural gas transported by sub-station cars; wherein, the buffer separation equipment includes: gas buffer separation pipe, liquid buffer separation pipe and gas-liquid monitoring device; the gas buffer separation pipe is located in the liquid buffer above the separation tube, and the lower end interface of the gas buffer separation tube is connected to the upper end interface of the liquid buffer separation tube; the gas-liquid monitoring device is arranged at the connection between the gas buffer separation tube and the liquid buffer separation tube The position is used to monitor the gas-liquid state of the connection position.

In a preferred solution, the gas buffer separation pipe and the liquid buffer separation pipe are arranged vertically.

In a preferred solution, a block is provided at the connection position between the gas buffer separation pipe and the liquid buffer separation pipe, and the block is connected to the gas buffer separation pipe, the liquid buffer separation pipe and the gas-liquid monitoring The devices communicate with each other.

In a preferred solution, a valve is provided at the lower end of the liquid buffer separation pipe to discharge the liquid medium in the liquid buffer separation pipe.

In a preferred solution, the gas unloading system also includes: a filter and a gas filling machine, the filter and the gas filling machine are arranged on the gas unloading pipeline between the buffer separation device and the target gas storage cylinder; The filter is used to filter the gas-phase natural gas separated by the buffer separation equipment; the gas dispenser is used to refill the filtered gas-phase natural gas to the target gas storage bottle.

In a preferred solution, a safety valve is also included, and the safety valve is arranged at the front end of the filter.

In a preferred solution, a throttling valve is provided on the unloading pipeline between the sub-station car and the buffer separation equipment.

In a preferred solution, the throttle valve is a ball valve.

The utility model also proposes a natural gas hydraulic substation, including: a substation car and the above-mentioned unloading system.

It can be seen from the above technical solution that the advantages and positive effects of the utility model are: the gas-liquid buffer equipment is improved, and the natural gas cylinder in the prior art is omitted, so that the unloading system does not include special equipment; The gas buffer separation tube and the liquid buffer separation tube do not reach the level of the pressure pipeline, are not special equipment, do not need to be approved, and are more convenient to use; the control detection design is added, that is, the gas-liquid detection device, which effectively reduces the probability of equipment operation accidents , which greatly improves the reliability and stability of the equipment. The utility model is simple in structure, and the existing equipment has been upgraded and modified, and the feasibility is high. The pipeline can be prefabricated in the field, and the pipeline can be directly connected without fire in the dangerous area of the site, which reduces manpower and material resources.

Description of drawings

Fig. 1 is a front view of an unloading structure of a natural gas hydraulic substation in the prior art.

Fig. 2 is a left view of the gas unloading structure of the natural gas hydraulic substation in the prior art.

Fig. 3 is a front view of the gas unloading structure of the natural gas hydraulic substation according to the embodiment of the present invention.

Fig. 4 is a left view of the gas unloading structure of the natural gas hydraulic substation according to the embodiment of the utility model.

Reference signs are explained as follows: 10, steel cylinder; 2, buffer separation equipment; 3, filter; 5, safety valve; 6, throttle valve; 7, unloading pipeline; 21, gas buffer separation pipe; 22, liquid buffer separation 23. Gas-liquid monitoring device; 24. Block; 25. Valve; 31. Discharge valve.

detailed description

Typical implementations embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the utility model can have various changes in different embodiments, all of which do not depart from the scope of the utility model, and the description and illustrations therein are used as illustrations in nature, not for To limit the utility model.

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail.

The natural gas hydraulic substation of this embodiment includes: a substation car (not shown in the figure) and an unloading system. Natural gas is discharged from the front end of the sub-station car and transported to the target container through the gas unloading system, such as the gas storage cylinder of the natural gas vehicle.

The unloading system of the natural gas hydraulic substation includes: buffer separation equipment 2, filter 3, gas dispenser (not shown in the figure), safety valve 5, throttle valve 6 and unloading pipeline 7 connecting the above equipment.

The buffer separation equipment 2 communicates with the sub-station vehicle through the A end of the gas discharge pipeline 7. The buffer separation equipment 2 can separate the gas and liquid from the natural gas transported by the sub-station vehicle and perform gas-liquid monitoring.

Wherein, the buffer separation device 2 includes: a gas buffer separation pipe 21 , a liquid buffer separation pipe 22 and a gas-liquid monitoring device 23 .

The gas buffer separation pipe 21 is located above the liquid buffer separation pipe 22, and the gas buffer separation pipe 21 and the liquid buffer separation pipe 22 are arranged vertically. The lower end interface of the gas buffer separation pipe 21 is connected to the upper end interface of the liquid buffer separation pipe 22, and the gas-liquid monitoring device 23 is arranged at the connection position of the gas buffer separation pipe 21 and the liquid buffer separation pipe 22, in order to monitor the gas at the connection position. liquid state. Preferably, a block 24 is provided at the connection position between the gas buffer separation pipe 21 and the liquid buffer separation pipe 22 , and the block body 24 communicates with the gas buffer separation pipe 21 , the liquid buffer separation pipe 22 and the gas-liquid monitoring device 23 .

When the natural gas is transported to the interface between the gas buffer separation pipe 21 and the liquid buffer separation pipe 22, the gas phase medium continues to be transported along the gas buffer separation pipe 21, and the high-speed flowing liquid settles to the liquid buffer separation pipe 22 due to gravity buffering, thereby realizing natural gas Gas-liquid separation in buffer separation plant 2.

In actual use, the gas buffer separation pipe 21 and the liquid buffer separation pipe 22 may also be arranged approximately vertically, such as inclined, etc., which is not limited here.

The lower end of the liquid buffer separation pipe 22 is provided with a valve 25 for discharging the liquid medium in the liquid buffer separation pipe 22 .

Preferably, the gas buffer separation pipe 21 and the liquid buffer separation pipe 22 have the same length to ensure the accuracy and timeliness of the measurement results of the gas-liquid monitoring device 23 .

The filter 3 and the filling machine are arranged on the unloading pipeline 7 between the buffer separation equipment 2 and the target gas storage cylinder (not shown in the figure); wherein, the B end of the unloading pipeline 7 is connected with the filling machine, and the filter The device 3 is arranged at the front end of the filling machine, and the safety valve 5 is arranged at the front end of the filter 3 . The lower end of the filter 3 is provided with a discharge valve 31, and the discharge port C end near the top of the safety valve 5 is provided on the discharge pipeline.

When the system pressure exceeds the specified value, open the safety valve 5 to discharge a part of the gas in the system so that the system pressure does not exceed the allowable value, so as to ensure that the system has an accident due to excessive pressure. The filter 3 is used to filter the gas-phase natural gas separated by the buffer separation device 2 , and the filling machine 4 is used to fill the filtered gas-phase natural gas into a target gas storage cylinder.

Throttle valve 6 is arranged on the unloading pipeline 7 between sub-station car and buffer separation equipment 2 . In this embodiment, the throttle valve 6 is a ball valve to control fluid flow.

The working principle of the unloading system of the natural gas hydraulic substation in this embodiment is: the buffer separation device 2 performs buffer sedimentation separation on the liquid droplets flowing at high speed. The gas-liquid monitoring device 23 is installed in the middle of the gas buffer separation pipe 21 and the liquid buffer separation pipe 22 to monitor the gas-liquid state of the medium at all times. The gas-liquid monitoring device 23 is installed on the block 24, and the gas buffer separation pipe 21 and the liquid buffer separation pipe 22 Through the block 24, when the liquid level inside the liquid buffer separation pipe 22 reaches the detection area of the gas-liquid monitoring device 23, the control system prompts an alarm and stops running; the operation and maintenance personnel on the station pass the valve 25 according to the alarm prompt. The gas buffer separation pipe 21 and the liquid buffer separation pipe 22 are drained or safety tested, thereby avoiding the liquid medium from being injected into the target container.

The unloading system of the natural gas hydraulic substation in this embodiment has been improved in equipment, and the natural gas cylinder in the prior art has been omitted, so that no special equipment is included in the unloading system; the gas buffer separation pipe 21 and the liquid The buffer separation pipe 22 does not reach the level of the pressure pipeline, does not belong to special equipment, does not require approval, and is more convenient to use; the control detection design is added, that is, the gas-liquid detection device, which effectively reduces the probability of equipment operation accidents and greatly improves equipment reliability and stability.

The utility model is simple in structure, and the existing equipment has been upgraded and transformed, and the feasibility is high. The pipeline can be prefabricated in the field, and the pipeline can be directly connected without fire in the dangerous area of the site, which reduces manpower and material resources.

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

Claims (9)

1. An unloading system of a natural gas hydraulic substation, characterized in that it comprises: a buffer separation device, the buffer separation device is communicated with the substation car through an unloading pipeline, and the buffer separation device can connect the substation car Gas-liquid separation and gas-liquid monitoring are carried out for the transported natural gas; Wherein, the buffer separation equipment includes: a gas buffer separation pipe, a liquid buffer separation pipe and a gas-liquid monitoring device; the gas buffer separation pipe is located above the liquid buffer separation pipe, and the lower end interface of the gas buffer separation pipe is connected to the The upper end of the liquid buffer separation pipe is connected to the interface; the gas-liquid monitoring device is arranged at the connection position between the gas buffer separation pipe and the liquid buffer separation pipe, and is used to monitor the gas-liquid state at the connection position. 2. The gas unloading system according to claim 1, wherein the gas buffer separation pipe and the liquid buffer separation pipe are vertically arranged. 3. The gas unloading system according to claim 1, characterized in that, the connecting position of the gas buffer separation pipe and the liquid buffer separation pipe is provided with a block, and the block is connected with the gas buffer separation pipe, The liquid buffer separation pipe and the gas-liquid monitoring device communicate with each other. 4. The gas unloading system according to claim 1, wherein a valve is provided at the lower end of the liquid buffer separation pipe to discharge the liquid medium of the liquid buffer separation pipe. 5. The gas unloading system as claimed in claim 1, characterized in that, the gas unloading system also comprises: a filter and an air feeder, the filter and the gas feeder are located at the buffer separation equipment and On the unloading pipeline between the target gas cylinders; The filter is used to filter the gas-phase natural gas separated by the buffer separation equipment; The filling machine is used to add gas to the target gas cylinder after filtering the gas phase natural gas. 6. The degassing system according to claim 5, further comprising a safety valve, the safety valve being arranged at the front end of the filter. 7. The gas unloading system according to claim 1, wherein a throttle valve is arranged on the gas unloading pipeline between the sub-station car and the buffer separation equipment. 8. The air unloading system according to claim 7, wherein the throttle valve is a ball valve. 9. A natural gas hydraulic substation, characterized by comprising: a substation car and the gas unloading system according to any one of claims 1-8.