CNG Filling Station Post Dewatering Unit

Description of the unit:
The post dewatering unit is located between the compressor outlet and the sequence control panel. This series of products is used when the pressure in the network is too low (the investment in front dewatering is too high) or when it is not possible to leave an interface between the compressor stages. This series of products have two types: manual and automatic, the adsorption cycle is 8-12 hours, and the vehicle type is 4-6 hours.
Characteristics of the device.
　　Small volume, light weight, suitable for small and medium-sized filling stations, the initial investment is smaller than the front dewatering device, but the operating costs are higher.
　　It integrates drying, filtering and oil removal with dust removal, pressure maintaining valve and pressure reducing device.
　　It is required that there is no innate pollution in the gas well (or gas cylinder group). The buffer tank before the compressor has a large passenger volume.
　　Indoor installation, aesthetically pleasing.
　　The station is required to optimise the design of the source and discharge of regas and strictly implement the operating procedures.

　Brief description of the process.
　　The blue line in the figure is the adsorption circuit, the red line is the regeneration circuit, and the grey line indicates the discharge circuit. The gas flow enters the pre-filter and precision filter in turn, removes the free oil, water and dust and then enters the A tank through the broad 1, the gas is dehydrated and then sent to the inlet of the sequence disc through the post-filter and the pressure keeping min. Regeneration gas is introduced from the outlet of the device or low-pressure gas wells (or low-pressure gas cylinder group), and enters the heater through the pressure reduction device, and then enters the desorption bed of tank B after warming up. The resolved exhaust gas enters the cooler and separator through Min 4, removes the precipitated liquid water and is discharged into the low-pressure pipe network in front of the compressor or emptied.