The working principle and technological characteristics of CNG refueling stations for compressed natural gas There are two operating modes for CNG refueling stations in China: mother-child station operation mode and standard station operation mode. This window will introduce the knowledge of CNG refueling stations one after another. Today we mainly introduce the working principle and technological features of CNG refilling stations.
Operation Principle After entering the station, the raw material gas sent from the pipeline is first filtered, metered (installed by the gas supply unit), and then entered into a low-pressure dehydration unit to remove the water, and the dew point is at or below the national automotive standard (ie In the standard state -55 °C), then through the buffer into the natural gas compressor block. This system uses a skid-mounted compressor system to achieve gas compression and manages gas through a priority control panel. After entering the dry gas of the skid-mounted compressor system, the pressure reaches 25 Mpa after multi-stage supercharging. The interstage gas passes through the air cooler and the oil-water separator and enters the next stage. The compressor system's PLC (programmable logic controller) performs whole-process management such as signal acquisition, fault diagnosis, fault display, priority control, and sequence start/stop for the entire system, and is operated in an unattended, fully automated manner. The compressed high-pressure gas is filtered by the compressor and passed through the priority control panel to the gas storage well, the dispenser, and the refueling column. The refueling of natural gas vehicles is achieved through the dispenser and the refueling of natural gas trailers is achieved through the refueling columns. The gas storage wells are divided into three groups to achieve sequential gas supply to increase the gas utilization rate, and a double* dispenser is configured at the same time. The dispenser can be automatically and sequentially gasified, automatically closed to pressure, metered and equipped with an emergency shut-off valve.
Process Features (1) Stationary safety cut-off system: An emergency shut-off valve is set on the incoming natural gas pipeline, and a high-efficiency filter is installed after the shut-off valve.
(2) Dehydration regeneration system: According to the raw material gas purification treatment, the raw natural gas only undergoes a simple separation of oil, gas and water during the production process. Therefore, the saturated water content of the raw material gas under the working conditions exists. Natural gas containing low-pressure saturated water is pressurized to 25 MPa, which forms part of free water and saturated water under working conditions; free water and heavy hydrocarbons are separated and filtered through the compressor; pressure is 25.0 MPa and temperature is 45°C. The saturated water content still does not meet the dew point requirement for CNG vehicles. Therefore, the raw gas must be dehydrated to remove saturated water, and the natural gas dew point should be further reduced to less than -55°C (dew point under standard conditions) to meet the CNG inflation quality requirements. It also provides guarantee for substation operation. The dehydration process in the gas station uses a molecular sieve adsorbent. The natural gas dehydration device is located in front of the compressor and the natural gas enters the dehydration device, where free moisture and oil are extracted. Desiccator packing needs to be regenerated with natural gas after saturation. To avoid waste, the regeneration gas from the dehydration unit is obtained from raw natural gas.
(3) Natural gas water analysis system: An on-line trace water analyzer is installed after the dehydration device to monitor the water content of the finished gas in real time. The secondary instrument is located in the control room. If the dew point is found to be higher than -55°C, the dehydration device must be switched. .
(4) Pressure regulating system: Considering that the gas pressure from the gas transmission station will fluctuate with different gas consumption, in order to ensure a smooth compressor inlet pressure, the compressor can work at its optimal design point as much as possible, and the station is set to one. Set pressure regulating system.
(5) All-station safety monitoring system: In addition to system-controlled pressure, oil pressure, temperature, vibration, and overload safety protection systems, the system is equipped with reliable and overpressure natural gas discharge devices; GB50156-2002 requirements flammable gas alarm controlled by the PLC and cut off device, the device and the power supply, air supply system formed a locking relationship, can automatically cut off the compressor intake and power supply. According to the user's needs, the above-mentioned monitoring points and computers can also be connected online to form a computer remote centralized monitoring system.
(6) Automatic control system: CNG refueling station equipment is operated in flammable, explosive, high-pressure and heavy-load working environment. The level of automation of the equipment directly determines the economic operation index of the system and the reliability of safe operation. Therefore, the compressor system implements a highly automated control and management, with the programmable controller PLC as the core, using the motor soft start, closed pressure relief no load start; system oil pressure, current, temperature, pressure automatic monitoring; automatic sewage system; Multi-block operation automatic authorization start; computer-controlled economic operation control system; PLC automatic sequential gas supply control system; automatic temperature compensation and gas sales safety devices and so on.
(7) Safety venting of high-pressure pipelines and equipment: The natural gas discharged from the compressor system at various levels is safely discharged outside the compressor room; the natural gas discharged from the storage tanks is drained at the sewage tank.
(8) Exhaust gas recovery system: Each level of the compressor system discharges effluent gas into the waste gas recovery tank. A high-efficiency filtration separation device is installed in the waste gas recovery tank to separate the oil and water contained in the waste gas, and the oil and water are deposited on the bottom of the tank. Natural gas enters the compressor's pre-stage intake air duct from the upper part, thereby achieving the effect of protecting the environment and reducing waste.
(9) In the configuration of refueling station equipment, it is also possible to provide a computer operation management system according to the user's requirements so as to adapt to the user's various modes of marketing management requirements.
We recommend using the MICHELL natural gas dew point detection method to perform 24-hour on-line monitoring of water dew point in CNG.
Operation Principle After entering the station, the raw material gas sent from the pipeline is first filtered, metered (installed by the gas supply unit), and then entered into a low-pressure dehydration unit to remove the water, and the dew point is at or below the national automotive standard (ie In the standard state -55 °C), then through the buffer into the natural gas compressor block. This system uses a skid-mounted compressor system to achieve gas compression and manages gas through a priority control panel. After entering the dry gas of the skid-mounted compressor system, the pressure reaches 25 Mpa after multi-stage supercharging. The interstage gas passes through the air cooler and the oil-water separator and enters the next stage. The compressor system's PLC (programmable logic controller) performs whole-process management such as signal acquisition, fault diagnosis, fault display, priority control, and sequence start/stop for the entire system, and is operated in an unattended, fully automated manner. The compressed high-pressure gas is filtered by the compressor and passed through the priority control panel to the gas storage well, the dispenser, and the refueling column. The refueling of natural gas vehicles is achieved through the dispenser and the refueling of natural gas trailers is achieved through the refueling columns. The gas storage wells are divided into three groups to achieve sequential gas supply to increase the gas utilization rate, and a double* dispenser is configured at the same time. The dispenser can be automatically and sequentially gasified, automatically closed to pressure, metered and equipped with an emergency shut-off valve.
Process Features (1) Stationary safety cut-off system: An emergency shut-off valve is set on the incoming natural gas pipeline, and a high-efficiency filter is installed after the shut-off valve.
(2) Dehydration regeneration system: According to the raw material gas purification treatment, the raw natural gas only undergoes a simple separation of oil, gas and water during the production process. Therefore, the saturated water content of the raw material gas under the working conditions exists. Natural gas containing low-pressure saturated water is pressurized to 25 MPa, which forms part of free water and saturated water under working conditions; free water and heavy hydrocarbons are separated and filtered through the compressor; pressure is 25.0 MPa and temperature is 45°C. The saturated water content still does not meet the dew point requirement for CNG vehicles. Therefore, the raw gas must be dehydrated to remove saturated water, and the natural gas dew point should be further reduced to less than -55°C (dew point under standard conditions) to meet the CNG inflation quality requirements. It also provides guarantee for substation operation. The dehydration process in the gas station uses a molecular sieve adsorbent. The natural gas dehydration device is located in front of the compressor and the natural gas enters the dehydration device, where free moisture and oil are extracted. Desiccator packing needs to be regenerated with natural gas after saturation. To avoid waste, the regeneration gas from the dehydration unit is obtained from raw natural gas.
(3) Natural gas water analysis system: An on-line trace water analyzer is installed after the dehydration device to monitor the water content of the finished gas in real time. The secondary instrument is located in the control room. If the dew point is found to be higher than -55°C, the dehydration device must be switched. .
(4) Pressure regulating system: Considering that the gas pressure from the gas transmission station will fluctuate with different gas consumption, in order to ensure a smooth compressor inlet pressure, the compressor can work at its optimal design point as much as possible, and the station is set to one. Set pressure regulating system.
(5) All-station safety monitoring system: In addition to system-controlled pressure, oil pressure, temperature, vibration, and overload safety protection systems, the system is equipped with reliable and overpressure natural gas discharge devices; GB50156-2002 requirements flammable gas alarm controlled by the PLC and cut off device, the device and the power supply, air supply system formed a locking relationship, can automatically cut off the compressor intake and power supply. According to the user's needs, the above-mentioned monitoring points and computers can also be connected online to form a computer remote centralized monitoring system.
(6) Automatic control system: CNG refueling station equipment is operated in flammable, explosive, high-pressure and heavy-load working environment. The level of automation of the equipment directly determines the economic operation index of the system and the reliability of safe operation. Therefore, the compressor system implements a highly automated control and management, with the programmable controller PLC as the core, using the motor soft start, closed pressure relief no load start; system oil pressure, current, temperature, pressure automatic monitoring; automatic sewage system; Multi-block operation automatic authorization start; computer-controlled economic operation control system; PLC automatic sequential gas supply control system; automatic temperature compensation and gas sales safety devices and so on.
(7) Safety venting of high-pressure pipelines and equipment: The natural gas discharged from the compressor system at various levels is safely discharged outside the compressor room; the natural gas discharged from the storage tanks is drained at the sewage tank.
(8) Exhaust gas recovery system: Each level of the compressor system discharges effluent gas into the waste gas recovery tank. A high-efficiency filtration separation device is installed in the waste gas recovery tank to separate the oil and water contained in the waste gas, and the oil and water are deposited on the bottom of the tank. Natural gas enters the compressor's pre-stage intake air duct from the upper part, thereby achieving the effect of protecting the environment and reducing waste.
(9) In the configuration of refueling station equipment, it is also possible to provide a computer operation management system according to the user's requirements so as to adapt to the user's various modes of marketing management requirements.
We recommend using the MICHELL natural gas dew point detection method to perform 24-hour on-line monitoring of water dew point in CNG.
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