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26
2021
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03
PSA nitrogen making machine working process
The working process of the PSA nitrogen making machine is that the air is compressed by an air compressor, and after dust removal, oil removal, and drying, it enters the air storage tank, and enters the left adsorption tower through the air inlet valve and the left suction inlet valve, and the tower pressure increases. The oxygen molecules in the compressed air are adsorbed by the carbon molecular sieve, and the unadsorbed nitrogen passes through the adsorption bed and enters the nitrogen storage tank through the left suction valve and nitrogen gas production valve. This process is called left suction and lasts for tens of seconds. After the left suction process is over, the left adsorption tower and the right adsorption tower are connected through the upper and lower pressure equalizing valves to balance the pressure of the two towers. This process is called pressure equalization, and the duration is 2 to 3 seconds. After the pressure equalization is over, the compressed air enters the right adsorption tower through the air inlet valve and the right suction inlet valve. The oxygen molecules in the compressed air are adsorbed by the carbon molecular sieve, and the nitrogen enters the nitrogen storage tank through the right suction outlet valve and the nitrogen gas production valve. This process is called right suction, and the duration is tens of seconds.
At the same time, the oxygen adsorbed by the carbon molecular sieve in the left adsorption tower is released back to the atmosphere through the left exhaust valve. This process is called desorption. On the contrary, when the left tower is adsorbing, the right tower is also desorbing at the same time. In order to completely discharge the oxygen released by the depressurization of the molecular sieve into the atmosphere, the nitrogen gas passes through a normally open back-purge valve to purge the adsorption tower that is being desorbed, and the oxygen in the tower is blown out of the adsorption tower. This process is called backflushing, and it is carried out simultaneously with desorption. After the right suction is over, it enters the pressure equalization process, then switches to the left suction process, and the cycle continues.
The working process of PSA nitrogen making machine is completed by the programmable controller controlling ten two-position five-way pilot solenoid valves, and then the solenoid valves respectively controlling the opening and closing of ten pneumatic pipeline valves. Ten two-position five-way pilot solenoid valves respectively control the left suction, equalizing pressure and right suction states. The time flow of left suction, equalizing pressure, and right suction has been stored in the programmable controller. When the PSA nitrogen making machine is powered off, the pilot air of the three two-position five-way pilot solenoid valves are all connected to the pneumatic pipeline valve. mouth. When the process is in the left suction state, the solenoid valve that controls the left suction is energized, and the pilot air connects to the opening ports of the left suction inlet valve, left suction production valve, and right exhaust valve, so that these three valves are opened to complete the left suction process , And the right adsorption tower desorbs at the same time. When the process is in the equalizing state, the solenoid valve that controls equalizing is energized, and other valves are closed; the pilot air connects to the opening ports of the upper equalizing valve and the lower equalizing valve, so that the two valves are opened to complete the equalizing process. When the process is in the right suction state, the solenoid valve that controls the right suction is energized, and the pilot air connects to the right suction inlet valve, right suction production valve, and left exhaust valve opening ports, so that these three valves are opened to complete the right suction process , And the left adsorption tower desorbs at the same time. In each process, except the valve that should be opened, other valves should be in the closed state.
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