CNG, short for Compressed Natural Gas, refers to natural gas that is compressed to a set high-pressure state through a compressor. The flexibility and considerable carrying capacity of CNG transportation have greatly expanded the application fields and scope of natural gas. It overcomes the limitations of pipeline transportation and can realize point-to-point gas supply outside the coverage of pipelines. The gas supply volume has a large elastic space and is suitable for gas supply scales from tens of cubic meters to tens of thousands of cubic meters. The transportation mode is flexible, vehicles, boats, etc. can be used for transportation, and the adjustment is flexible. It is low-cost and more economical than traditional fuel, so it has been widely used as vehicle fuel. Then, building a gas filling station suitable for regional conditions can effectively reduce unnecessary investment, bring better profits, and reduce the idle rate of equipment.
1. Classification of CNG dispenser stations
CNG dispenser stations can generally be divided into CNG standard stations,
CNG mother stations, and CNG sub-stations according to gas supply type and gas supply volume.
During construction, gas supply and demand, as well as transportation costs, should be fully considered.
The location and scale of gas filling stations should be reasonably selected and should be located away from important facilities and densely populated areas.
2. CNG standard station
CNG standard stations need to be built where low-pressure natural gas pipelines pass through. The natural gas supply volume is generally 600-1000Nm³/h. The gas filling station takes gas directly from the natural gas pipeline and removes the natural gas through pressure regulation and metering, desulfurization, dehydration, and other processes. The impurities in the gas then enter the compressor unit and are pressurized to 25MPa. They then enter the gas storage bottle group for storage at the station or refuel the vehicle through a gas dispenser. The sequence controller is responsible for pipeline pressure deployment.
3. CNG mother station
Different from CNG standard stations, the gas supply volume of CNG mother station is generally 2500-4000Nm³/h. Therefore, it is necessary to ensure that the natural gas pipeline has sufficient gas supply volume. The location is generally chosen to be close to the natural gas gate station or on a large gas transmission trunk line. The process flow is similar to the CNG standard station. After the natural gas enters the station, it undergoes metering and pressure regulation, desulfurization and dehydration, and other processes. It is compressed by a compressor and then distributed to the CNG gas dispenser or station gas storage bottle group through the sequence controller.
4. CNG substation
Corresponding to the CNG mother station, it is the molecular station of the CNG mother station. It is usually built in places where there are no natural gas pipelines or where it is not suitable to use pipeline gas. CNG is transported from the mother station to the car through a CNG pipe bundle trailer. The sub-station equipment is generally equipped with a CNG unloading column, a sub-station compressor, and a CNG gas storage bottle. Group, composed of sequence controller and CNG gas dispenser. The gas supply volume is configured according to the on-site demand and the equipment with corresponding production capacity is configured.
In general, no matter what type of CNG dispenser station it is, the compressor is an indispensable piece of equipment. Choosing the right compressor can save energy while maximizing the compressor’s production capacity. Improve economic efficiency. At the same time, scientific selection of gas storage bottle groups can greatly improve the operating efficiency of gas filling stations.
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