After compressed by the air compressor, the air enters the air storage tank after dust removal, oil removal and drying, and enters the intake valve and the left suction valve through the left adsorption valve. In the tower, the tower pressure increases, the oxygen molecules in the compressed air are absorbed by the carbon molecular sieve, and the nitrogen that is not absorbed enters the nitrogen storage tank through the adsorption bed and the left suction valve and nitrogen making valve. This process is called left suction and lasts for tens of seconds.
After the left suction process, the left adsorption tower and the right adsorption tower are connected by the upper and lower pressure sharing valve to balance the pressure of the two towers. This process is called pressure equalization and lasts two to three seconds. After pressure equalization is completed, compressed air enters the right adsorption tower through the inlet valve and the right suction valve. The oxygen molecules in the compressed air are absorbed by the carbon molecular sieve, and the rich nitrogen enters the nitrogen through the right suction outlet valve and the nitrogen making valve. Tank, this process is called right suction and lasts for tens of seconds.
At the same time, the oxygen adsorbed by carbon molecular sieve in the left adsorption tower is decompressed and released back to the atmosphere through the left exhaust valve. This process is called desorption. Conversely, when the left column adsorption, the right column also desorption at the same time.
In order to fully discharge the oxygen released by molecular sieve decompression into the atmosphere, nitrogen is used to purge the desorption adsorption tower through normally open reverse blowing valve, and the oxygen in the tower is blown out of the adsorption tower. This process is called backblowing and occurs simultaneously with desorption.
After the right suction is completed, the pressure equalization process is entered, and then the left suction process is switched to continue the cycle.
The working process of nitrogen making machine is completed by the programmable controller to control three two five-way pilot solenoid valve, and then by the solenoid valve to control the opening and closing of eight pneumatic pipeline valves. Three two five-way pilot solenoid valve control respectively left suction, pressure, right suction state. The time flow of left suction, pressure equalization and right suction has been stored in the programmable controller. In the state of power, three two five-way pilot solenoid valve pilot air source and pneumatic pipeline valve closed port connected. When the process is in the left suction state, the control of the left suction solenoid valve is energized, and the pilot gas is connected with the opening port of the left suction inlet valve, the left suction production valve and the right exhaust valve, so the three valves are opened to complete the left suction process. At the same time, desorption of the adsorption tower. When the process is in the state of pressure equalization, the control of pressure equalization solenoid valve power, other valves closed; The pilot gas is connected with the opening of the upper pressure equalizing valve and the lower pressure equalizing valve, so that the two valves are opened to complete the pressure equalizing process. When the process is in the right suction state, the control of the right suction solenoid valve is energized, the pilot gas is connected with the right suction inlet valve, the right suction production valve, the left exhaust valve opening, so that the three open the valve to complete the correct suction process. At the same time, desorption leaves the adsorption column. During each process, all valves should be closed except those that should be opened.