CN215722493U - Safe recovery unit of CNG gas column - Google Patents

Abstract

The utility model belongs to the technical field of compressed natural gas recovery equipment, and particularly relates to a safe recovery device for CNG (compressed natural gas) filling columns, which comprises 5 filling columns, a main pipeline, a compressor, a trailer bottle group, a manifold, a ball valve, a recovery tank, a pressure gauge, a safety valve, a gas pipe, a pressure reducing valve, a check valve, a filter, a blow-off valve, a blow-off pipe and an emptying pipe; the air column is communicated with a collecting pipe through an emptying pipe, the emptying pipe is provided with a ball valve and a check valve, the collecting pipe is communicated with an air inlet of a recovery tank, an air outlet at the upper part of the recovery tank is communicated with one end of an air conveying pipe, the air conveying pipe is sequentially provided with the ball valve, 2 pressurizing valves, the check valve and a filter, the other end of the air conveying pipe is communicated with a main pipeline, the main pipeline is communicated with an air inlet of a compressor through a pipeline, and an air outlet of the compressor is communicated with a trailer bottle group; the top of the recovery tank is provided with a safety valve, and the bottom of the recovery tank is provided with a blow-off pipe provided with a blow-off valve. The problem of the potential safety hazard of environmental pollution caused by the gas that needs to be discharged in production is solved, production efficiency is improved, and energy waste is reduced.

Description

Safe recovery unit of CNG gas column

Technical Field

The utility model belongs to the technical field of compressed natural gas recovery equipment, and particularly relates to a safe recovery device for a CNG (compressed natural gas) filling column.

Background

Compressed Natural Gas (CNG) is gradually being used as a clean energy source. The CNG primary filling station is used as a special place for filling and transporting compressed natural gas, receives and purifies a large amount of natural gas every day, and provides dry and clean natural gas for a CNG trailer cylinder group and a CNG vehicle after compression, separation and cooling. The CNG gas filling primary station has larger treatment capacity, the daily emptying loss is increased, and the environmental pollution and the potential safety hazard brought by the environmental pollution need to be taken into consideration.

The CNG gas filling primary station process equipment is always in a high-pressure state in the operation process, the process equipment is very easy to leak, and gas leakage may occur in a plurality of places, such as: leakage may occur in pipe welds, valves, flanges, cylinders, compressors, columns, etc.; when the compressed natural gas pipeline is pulled off or the gas filling vehicle is accidentally out of control to crash the gas filling machine, a large amount of natural gas can be leaked. Once the leaked gas meets an ignition source, a fire and explosion can occur. As is known, the unsafe state of an object is one of two major factors in safety, so that people need to be prevented from happening gently when the object is made to work safely, and accidents are prevented fundamentally. Taking a certain gas filling mother station as an example, a gas source of the certain gas filling mother station is that gas from an upstream pipeline enters a compressor after pressure regulating and metering, pre-dehydration, buffering and pressure stabilization, and after multi-stage compression, output dry gas enters a gas filling column and is conveyed to a CNG trailer bottle group through a gas filling hose to be supplied to customers for use. The charging time of each vehicle is correspondingly changed according to the pressure of the upstream pipe, and the average time for charging a vehicle by a single machine is one hour and forty minutes. After gas filling is completed, the gas filling ball valve in the equipment needs to be closed, each bottle group valve and the main valve above the operation are closed, the emptying ball valve of the equipment is slowly opened, residual gas in the hose is discharged, and the gun head can be taken down and placed back to the designated position of the hanging gun after evacuation and pressure relief. Because natural gas has the danger of inflammability and explosiveness, and the natural gas in the primary gas filling station is compressed high-pressure gas, when the gas is exhausted, the pressure of a pipeline reaches 20MPa, splashing can occur to cause local environmental pollution, once the exhaust concentration reaches the explosion limit, open fire can be met, such as vehicle ignition equipment, communication tools, electric sparks, electrostatic sparks and the like, can easily become ignition sources, and the danger of explosion and fire can be caused. The surrounding environment of the primary station for filling gas is complex, vehicles frequently come in and go out, and people flow is more, so that the safety risks brought are extremely high, and the potential risks threaten the safe operation of the primary station all the time. Once a safety accident happens, casualties, economic losses and bad social influence can be caused. Therefore, corresponding precautionary measures are required to be taken to ensure the operation safety of the primary gas filling station and meet the requirements of safety, environmental protection and economy. In addition, since the gas filling mother station is operated for 24 hours, a certain amount of wastage will occur at the emptying.

In order to prevent the occurrence of safety accidents and reduce the daily loss of CNG primary gas filling stations, countermeasures are necessary to solve the problems. Therefore, it is necessary to design a safe and reliable safe recovery device for the CNG gas column.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a safe and reliable CNG gas column safety recovery device, which is used for reforming a natural gas recovery device for emptying a gas column and recycling the natural gas for secondary use, so that the potential safety hazard problem of environmental pollution caused by gas required to be discharged during production can be solved, the production efficiency can be improved, and the energy waste can be reduced.

The technical scheme adopted by the utility model is as follows: a CNG gas column safety recovery device comprises 5 gas columns, a main pipeline, a compressor and a trailer cylinder group, and further comprises a manifold, a ball valve, a recovery tank, a pressure gauge, a safety valve, a gas pipe, a pressure reducing valve, a check valve, a filter, a blow-off valve, a blow-off pipe and an emptying pipe; the 5 gas filling columns are communicated with a collecting pipe through an emptying pipe, the emptying pipe is provided with a ball valve and a check valve, the collecting pipe is communicated with a gas inlet of a recovery tank, a gas outlet at the upper part of the recovery tank is communicated with one end of a gas conveying pipe, the gas conveying pipe is sequentially provided with the ball valve, 2 pressurizing valves, the check valve and a filter, the other end of the gas conveying pipe is communicated with a main pipeline, the main pipeline is communicated with a gas inlet of a compressor through a pipeline, and a gas outlet of the compressor is communicated with a trailer bottle group; the top of the recovery tank is provided with a safety valve, the bottom of the recovery tank is provided with a blow-off pipe, and the blow-off pipe is provided with a blow-off valve.

Furthermore, a ball valve is arranged at the communication position of the header and the recovery tank.

Further, the pressure gauge is installed on the recovery tank.

The utility model has the beneficial effects that: after the gas column recovery device is transformed, more scientific and rigorous measures are taken for discharging the filled CNG trailer cylinder group, so that the random discharge of natural gas and pollution of oil stain splashing to the surrounding environment are avoided; the danger that the concentration of the natural gas is gathered to reach the explosion limit and accidents happen when the natural gas meets open fire is prevented; the noise caused by the discharge of the gas is reduced, and the protection of the occupational diseases of the operators is greatly facilitated. The waste of resources can be effectively saved, most of natural gas is uniformly recovered and reused, the cost is reduced, and the effect is improved.

Description of the drawings:

fig. 1 is a schematic structural diagram of the first embodiment.

The specific implementation mode is as follows:

example one

Referring to fig. 1, the safe recovery device for the CNG gas column comprises 5 gas columns 1, a main pipeline 11, a compressor 12 and a trailer bottle group 13, and further comprises a collecting pipe 2, a ball valve 3, a recovery tank 4, a pressure gauge 5, a safety valve 6, a gas pipe 7, a pressure reducing valve 8, a check valve 9, a filter 10, a blow-off valve 14, a blow-off pipe 15 and an emptying pipe 16; the 5 gas filling columns 1 are communicated with a collecting pipe 2 through an emptying pipe 16, the emptying pipe 16 is provided with a ball valve 3 and a check valve 9, the collecting pipe 2 is communicated with a gas inlet of a recovery tank 4, a gas outlet at the upper part of the recovery tank 4 is communicated with one end of a gas conveying pipe 7, the gas conveying pipe 7 is sequentially provided with the ball valve 3, 2 pressurizing valves 8, the check valve 9 and a filter 10, the other end of the gas conveying pipe 7 is communicated with a main pipe 11, the main pipe 11 is communicated with a gas inlet of a compressor 12 through a pipeline, and a gas outlet of the compressor 12 is communicated with a trailer bottle group 13; the top of the recovery tank 4 is provided with a safety valve 6, the bottom of the recovery tank is provided with a sewage discharge pipe 15, and the sewage discharge pipe 15 is provided with a sewage discharge valve 14; a ball valve 3 is arranged at the communication part of the collecting pipe 2 and the recovery tank 4; the pressure gauge 5 is installed on the recovery tank 4.

After each CNG trailer cylinder group is filled, the gas filling hose needs to be emptied. Residual gas in the gas filling hose needs to be connected with a three-way reducing pipeline through a seamless steel pipe of the gas filling column and then is connected to the upper part of the top of the gas filling column to be used as a dispersing opening, and the residual gas is discharged into the atmosphere. 5 gas columns of a certain gas filling mother station can collect the emptying pipelines of each gas column to a main manifold, and the manifold is connected to a newly-added equipment recovery tank to uniformly collect the emptied gas, so that the production requirement is met. The recovery tank can be skid-mounted, and the pressure and the volume of the recovery tank are designed according to the actual emptying requirement. Need to set up ball valve and check valve on the gas column evacuation pipe, the recovery tank should set up the relief pressure valve according to the pressure condition, relief valve and blowoff valve, certain gas filling mother's station upper reaches intake manifold line pressure is 1.6MPa, gas after the recovery tank collects falls to 1.6MPa by 20MPa and advances to need to carry out the smooth transport main pipeline that carries of surplus gas recovery that can discharge to jar gas in the decompression, the relief pressure valve should add several grades of decompression as required, set to the pressure that is higher than the pipeline of admitting air through the pressure regulation to the relief pressure valve, the pipeline that draws through the recovery tank at last connects to the upper reaches pipeline of admitting air, utilize pressure differential to realize the target of reutilization.

Claims (3)

1. The utility model provides a CNG gas column safety recovery unit that adds, includes 5 gas columns (1), trunk line (11), compressor (12) and trailer bottle group (13), its characterized in that: the safety recovery device also comprises a collecting pipe (2), a ball valve (3), a recovery tank (4), a pressure gauge (5), a safety valve (6), a gas pipe (7), a pressure reducing valve (8), a check valve (9), a filter (10), a blow-off valve (14), a blow-off pipe (15) and an emptying pipe (16); the 5 gas filling columns (1) are communicated with a collecting pipe (2) through an emptying pipe (16), a ball valve (3) and a check valve (9) are installed on the emptying pipe (16), the collecting pipe (2) is communicated with a gas inlet of a recovery tank (4), a gas outlet at the upper part of the recovery tank (4) is communicated with one end of a gas conveying pipe (7), the gas conveying pipe (7) is sequentially provided with the ball valve (3), 2 pressurizing valves (8), the check valve (9) and a filter (10), the other end of the gas conveying pipe (7) is communicated with a main pipe (11), the main pipe (11) is communicated with a gas inlet of a compressor (12) through a pipeline, and a gas outlet of the compressor (12) is communicated with a trailer bottle group (13); the top of the recovery tank (4) is provided with a safety valve (6), the bottom of the recovery tank is provided with a drain pipe (15), and the drain pipe (15) is provided with a drain valve (14).

2. The safe recovery device of the CNG gas column according to claim 1, characterized in that: and a ball valve (3) is arranged at the communication part of the collecting pipe (2) and the recovery tank (4).

3. The safe recovery device of the CNG gas column according to claim 1, characterized in that: the pressure gauge (5) is arranged on the recovery tank (4).

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