Common Desiccant Dryer Fault Analysis- CHANUN Air Compressor
Release time:
2025-07-01
Common Desiccant Dryer Fault Analysis- CHANUN Air Compressor
Fault Types and Causes
Common faults in desiccant dryers primarily focus on three areas: adsorbent, regeneration system, and valve operation:
Adsorbent Failure: Adsorbent degradation leading to increased dew point due to long-term saturation, oil contamination, or powdering.
For example: Adsorbent powdering can block airflow channels, causing increased pressure differential and excessive noise.
Regeneration System Abnormalities: Includes insufficient heating temperature, too short cooling/purge time, or inadequate regeneration gas flow.
For example: Regeneration tower depressurization failure or blower filter blockage can cause regeneration efficiency to drop by over 50%.
Valve Malfunctions: Pneumatic angle seat valves or butterfly valves sticking, solenoid valve cross-leakage, etc., leading to adsorption tower switching failure or abnormal pressure.
For example: If the top mark on a butterfly valve is parallel to the actuator direction, it indicates open; perpendicular indicates closed. Manual testing is required for troubleshooting.
Diagnosis and Countermeasures
Address the above faults by combining intelligent diagnostic technology and on-site troubleshooting methods:
Dew Point Monitoring & Parameter Calibration: Install online dew point meters and combined pressure/temperature sensors for real-time drying performance monitoring.
If dew point is abnormal, prioritize checking adsorbent condition and regeneration temperature (heating phase must reach 140-160°C, exhaust gas temperature >100°C).
Valve Operation Testing: Manually press the solenoid valve test button during power-off to check pneumatic valve reset status, and clean the pneumatic triplet filter (perform monthly).
Adsorbent Management: Use layered filling technology (coarse-fine-coarse structure) to reduce powdering, and replace adsorbent regularly.
Maintenance and Prevention
Extending desiccant dryer lifespan requires standardized maintenance procedures:
Daily Inspection: Record dew point and pressure fluctuations daily; listen for abnormal noise. Clean pre-filters and calibrate dew point meters weekly.
For example: Replace the post-filter element if the pressure differential exceeds 0.5 bar (0.5 kg/cm²).
Annual Overhaul: Replace adsorbent, inspect valve seals, and clean cooler scaling.
Energy Efficiency Improvement: Optimize regeneration gas consumption, adopt waste heat recovery systems, and implement dew point step control.
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