2.The pressure on towers A and B decreases simultaneously in power-on state
① Tower A adsorption, tower B regeneration
Observe the valve status, intake valve A is open, exhaust valve A is closed; intake valve B is close, exhaust valve B is open
②Tower A adsorption,tower B regeneration
Observe the valve status, intake valve B is open, exhaust valve B is closed; intake valve A is close, exhaust valve A is open
③If the above valve and solenoid valve are in normal condition, it is necessary to check whether the check valve of the regeneration tower is in air collusion, and the air has the possibility of backflow.
one way check valve
The working principle of the operation is that the high temperature compressed air first enters the regeneration tower, heats the regeneration adsorbent from the top down, then enters the main cooler to cool down, removes the liquid water in the compressed air through the water separator, and then enters the adsorption tower to adsorb from the bottom up, and the dry air is transported to the downstream gas end. Blowing cold regeneration is the high temperature compressed air advanced cooling in the main cooler, after the water separator removes the liquid water in the compressed air, into the regeneration tower from the bottom up to blow the cold adsorbent to bring out the high temperature heat of the adsorbent, and then into the sub-cooler after cooling again, into the adsorption tower from the bottom up adsorption, dry air is transported to the downstream gas end.
1. After startup, the screen displays the alarm of valve position failure
① First check whether the pressure of the control valve and pressure regulating valve meets the working pressure of the valve
② Manually test whether the solenoid valve coil is electric or whether the valve core has foreign matter plugs
③ Check whether the valve is open or closed properly
④ Check whether the valve position switch signal is abnormal
2. The dew point of the dry air outlet is too high
① The flow exceeds the rated capacity
② The inlet pressure is too low or the inlet temperature is too high
③ Adsorbent failure: the use period is extended, and the adsorbent is contaminated
④ The drainer system is blocked
3. Severe dew point fluctuation during switching
① Heating is not complete or blowing is not complete (observe the temperature at each stage)
② The cooling water temperature is too high, the heat dissipation effect is poor
③ Scale blockage inside the cooler causes poor heat dissipation
Q12
Cause Analysis of abnormal fluctuation of dew point of energy-saving desiccant air dryer?
1. Check whether the regeneration duration parameter is set properly.
Generally, the design of the adsorption half-cycle time of the desiccant air dryer is 4-6h, the heating and blowing cooling time are roughly half, the actual heating time will be set longer, and the blowing and cooling time will be set shorter, and the basis for determining whether the time setting is reasonable is: within the setting time, whether the heating and blowing exhaust gas temperature can reach the required value. The higher the temperature of the regeneration tail gas, the more thoroughly the regeneration of the adsorbent, and the better the dew point at the outlet of the desiccant air dryer. The lower the exhaust gas temperature, the more stable the dew point at the outlet of the desiccant air dryer when switching.
2. Check the heating temperature, check whether the heating outlet temperature can keep between 140℃and 160℃ of continuous heating when heating regeneration.
3. Check the regeneration temperature, and whether the regeneration tail gas can reach more than 100℃ during the heating regeneration period. During the cooling regeneration period, check whether the regeneration exhaust gas temperature drop below 45℃.
4. When the exhaust gas of heating regeneration and blowing cold regeneration cannot reach the ideal temperature, the regeneration time and heating temperature need to be adjusted according to the site situation.
5. Check whether the compressed air flow rate, air compressor exhaust volume and back-end gas consumption will exceed the capacity of the dryer.
6. Check the cooling effect, the cooler outlet temperature is within 40 degrees, the maximum shall not exceed 42 degrees.
If the outlet temperature is high, you need to check whether the cooling water flow is enough, whether the water pressure is enough, and whether the water temperature is too high.If the water temperature pressure flow is no problem, it is necessary to check whether the inside of the cooler is too dirty and scaled, and clean the inside of the radiator.