How to deal with the common faults of PAS pressure swing adsorption nitrogen machine

Daily equipment maintenance table

For the following items, under normal circumstances, check at least once a day, and check according to the requirements of the table below, and make a record of the inspection situation and processing results.

No. Item Check Item Maintenance period

1 Valve switch status Check whether the valve switch status is correct when the device is on or off

2 Pressing cylinder pressing state Pressing cylinder pressure is normal when the equipment is open and shut down

3 Muffler Exhaust status Check whether dust is discharged from the muffler when the device is running

4 Buffer tank blowdown valve blowdown is normal before starting, after shutdown

5 Whether the reading of each instrument is normal during the operation of the device

6 Check whether the air tightness of each pipe connection is leaking during the operation of the device

2.4 Equipment failure and troubleshooting methods Shenzhen nitrogen machine

No. Symptom Cause Troubleshooting method

1 purity is not qualified for a long time alarm 1, gas production is too large;

2, the adsorption pressure drops;

3, filter pressure difference is large;

4, the pneumatic valve does not operate or leak;

5, nitrogen analyzer failure;

6, molecular sieve failure. 1, adjust the gas production nitrogen machine

2, check the air compressor or air source;

3, replace the filter element;

4, repair the corresponding solenoid valve and pneumatic valve;

5, according to the instructions;

6, replace the molecular sieve.

2 carbon alarm 1, PLC program disorder;

2, compression cylinder alarm device failure;

3. Carbon molecular sieve sinks normally. 1, maintenance PLC;

2, maintenance alarm device;

3. Add carbon molecular sieve.

3 Silencer spray dust 1, carbon molecular sieve is not pressed;

2. The palm mat under the adsorption tower is damaged;

3. The steel wire mesh of the air extractor in the middle of the adsorption tower is damaged. 1. Check the hole plate on the cylinder and adsorption tower; Shenzhen nitrogen machine

2. Replace the brown mat under the adsorption tower;

3. Replace the wire mesh.

4 Buffer tank blowdown valve discharge carbon molecular sieve particles adsorption tower upper seal failure Stop to check the adsorption tower upper seal

Note: In case of item 3 and 4 failure, please stop the machine immediately and contact Woto.

2.5 Service life reference table of wearing parts and consumable parts

No. Reference value of service life of consumable parts and consumable parts

1. The normal operation and maintenance of carbon molecular sieve for more than 4 years do not significantly reduce the technical indicators without adding or replacing.

2. The pneumatic valve does not need to be replaced when it operates normally and has no leakage for 1.5 million times.

3. The solenoid valve does not need to be replaced when it works normally for more than 1.5 million times.

4. Dust filter 12 months or pressure gauge reading greater than 0.035MPa must be replaced filter element.

5. The air filter cartridge must be replaced within 6 months

6. Nitrogen analyzer must be replaced after 2 years

First, PSA nitrogen machine (pressure swing adsorption nitrogen production equipment) fault emergency shutdown steps

1. Turn off the power switch of the nitrogen generator;

2, close the flow meter downstream valve;

3, close the screw air compressor, cold and dry machine power switch;

4, close the nitrogen gas supply valve;

Second, PSA nitrogen machine (pressure swing adsorption nitrogen production equipment) normal operation status description

1, the power indicator light, left suction, voltage balancing, right suction indicator light cycle bright indicating the nitrogen production process;

2. When the left suction indicator light is on, the pressure of the left adsorption tank gradually increases from the equilibrium pressure during pressure balancing to the highest, while the pressure of the right adsorption tank gradually decreases from the equilibrium pressure during pressure balancing to zero;

3, when the pressure balancing indicator is on, the pressure of the left and right adsorption tank will gradually reach the balance of one liter and one drop;

4. When the right suction indicator light is on, the pressure of the right adsorption tank gradually increases from the equilibrium pressure during pressure balancing to the highest, while the pressure of the left adsorption tank gradually decreases from the equilibrium pressure during pressure balancing to zero;

5, nitrogen outlet pressure indicates normal gas pressure, the pressure will fluctuate slightly when used, but the change should not be too large;

6, the flow indicator of the flowmeter should be basically stable, the fluctuation should not be too large, the value of the flowmeter should not be greater than the rated gas production of the nitrogen production equipment;

7, the nitrogen analyzer value should not be less than the rated purity of the nitrogen production equipment, there may be a little fluctuation, but should not fluctuate too much.

Three, PSA nitrogen machine (pressure swing adsorption nitrogen production equipment) operation precautions

1. Adjust the nitrogen production valve after the flow meter according to the gas pressure and gas consumption, and do not adjust the flow rate at will to ensure the normal operation of the equipment;

2. The opening of the nitrogen gas production valve should not be too large to ensure the best purity;

3, nitrogen analyzer flowmeter should be adjusted to 0.5L/h scale;

4, the valve adjusted by the debugging personnel should not be rotated at will, so as not to affect the purity;

5, do not arbitrarily move the electrical parts in the control cabinet, do not arbitrarily remove the pneumatic pipe valve;

6, the operator should regularly check the pressure gauge on the nitrogen machine, and make a daily record of its pressure changes for equipment failure analysis;

7. Regularly observe the outlet pressure, flowmeter indication and nitrogen purity, compare with the required value, and solve the problem in time;

8, according to the technical requirements of screw air compressor, cold dryer, precision filter maintenance and maintenance to ensure air quality (air source must be oil-free). Air compressor, dry machine must be repaired at least once a year, according to the equipment maintenance, maintenance regulations to replace the wearing parts, and maintenance.

9, air separation nitrogen equipment in the process of work, carbon molecular sieve has a certain wear, should be inspected and filled once a year molecular sieve.

10. Complete the daily record form.

Fourth, PSA nitrogen making machine (pressure swing adsorption nitrogen making equipment) common failures and treatment

Symptom Possible cause Solution
Turn on the power switch,
The power indicator is off

1. The power supply is disconnected
2. Power supply insurance damage
3. The power switch is damaged. 1
2. Replace the power supply insurance
3. Replace the power switch
The flow indicator is off. 1. The indicator is damaged or the cable is not properly connected
2. The programmable controller is faulty. 1. Connect cables or replace indicators
2. Check the controller. If there is any problem, contact the manufacturer
Process instructions Abnormal Programmable controller fault Check the controller, if there is a problem contact the manufacturer
Pressure of left adsorption tank during left suction
It can't rise to normal

1. The left-suction solenoid valve is damaged
2. The left suction air valve is not opened. 1. Repair or replace the solenoid valve
2. Check the pipeline valve, if there is a fault repair or replacement
Pressure equalizing around the adsorption tank
Pressure cannot be equalized. 1. The solenoid valve that controls pressure equalization is damaged
2. The upper and lower pressure balancing valves are not opened. 1. Repair or replace the solenoid valves
2. Check the pressure equalizing valve and repair or replace it if any
Pressure of right adsorption tank during right suction
Can not rise to normal value 1. Control right suction solenoid valve damage
2. The right suction air valve is not opened. 1. Repair or replace the solenoid valve
2. Check the pipe valve, if any
The silencer keeps firing when you suck left or right
Gas, while the adsorption tank pressure does not rise 1. The blowback valve is opened too large
2. The solenoid valve is damaged
3. The pressure equalizing valve leaks
4. Air leakage of the desorption valve 1. Adjust the opening of the reverse blow valve to the appropriate level
2. Repair or replace the solenoid valve
3. Repair or replace the pipe valve
The purity of nitrogen fluctuates during use. 1. The air pressure fluctuates
2. Air consumption fluctuates 1. Maintain and repair air compressors
2. Keep the gas consumption within the rated flow rate
The reading of the nitrogen analyzer is inaccurate. 1. Air is mixed
2. Oxygen electrode failure 1. Check the oxygen electrode and purity measurement system
2. Replace the oxygen electrode