1. Turn off the nitrogen machine, nitrogen inlet valve and sampling valve, and also turn off the power switch of the nitrogen machine. Wait for the complete decompression of the system and pipes (the exhaust gas from the system is concentrated oxygen, pay attention to fire safety, indoor air circulation). Adjust the oxygen analyzer for sampling, adjust the pressure of the reducing valve to 1.0bar, adjust the sampling flowmeter, and adjust the gas volume to about 1, pay attention to the sampling gas volume should not be too large. Start testing nitrogen purity.

Second, when the compressed air source pressure reaches more than 0.7MPa, open the stop valve of the total inlet of the nitrogen machine, and then adjust the pressure reducing valve to reduce the pressure to about 0.4-0.5Mpa, and pay attention to the pressure of the two adsorption tanks and whether the work of the pneumatic valve can be carried out normally.

Third, then turn on the nitrogen generator power switch clockwise on the electric control cabinet of the PLC master station. Observe the pressure change of the two adsorption towers and judge whether the two adsorption towers can switch normally. The pressure of the regenerative tower is zero, and the pressure of the two towers should be close to half of the pressure of the original working tower when it is uniform.

Fourth, open the power switch of the oxygen meter, and adjust the appropriate sampling flow rate to observe the oxygen content. Adjust the opening of the purity valve according to the required nitrogen purity, and automatically switch into the nitrogen storage tank after the purity is qualified. The nitrogen storage pressure of the nitrogen storage tank is generally about 0.6 0.8MPa.

5. Close the entire system and all parts of the system, and observe whether the nitrogen system works normally when the pressure of the adsorption tank of the nitrogen maker reaches about 0.6MPa.

jpg (1) "style="width: 1080px; height: 1440px;"  Slowly open the vent inlet stop valve and adjust the flow rate to 1/2 of the rated flow rate. Adjust the opening of the nitrogen inlet valve to adjust the purity and flow of nitrogen.

7. Observe whether the oxygen content indicated by the oxygen meter meets the requirements. When the purity of nitrogen reaches the requirement, slowly open the pure gas outlet stop valve, adjust the flow rate to the required flow rate, close the blow-off inlet stop valve, and put into use when the equipment is in normal operation.