What problems can arise during the operation of closed-circuit cooling towers?

As core equipment in industrial cooling systems, closed-circuit cooling towers may experience various malfunctions during long-term operation due to design, operational, maintenance, or environmental factors. Let us discuss the common issues encountered during the operation of closed-circuit cooling towers and their solutions.

I. Reduced Cooling Efficiency
1. Insufficient circulating water flow or blockages
Causes: Obstructions in piping or spray systems, pump failure, or filter fouling restricting water flow. Solutions: Clear debris from pipes and spray nozzles; check pump operation; adjust valve openings to stabilize flow; clean filters regularly.
2. Scaling and fouling accumulation
Causes: High water hardness or lack of anti-scaling agents leading to scale buildup on coils or fill media, impairing heat exchange efficiency. Solutions: Perform regular chemical cleaning or mechanical descaling; use water softening systems or anti-scaling agents for prevention; focus on cleaning fill media and coils during maintenance.
3. Fan or heat dissipation system abnormalities
Causes: Damaged fan blades, worn bearings, or abnormal rotational speed resulting in insufficient airflow. Solutions: Replace worn parts; balance fan blades; inspect the motor and drive mechanism to ensure rotational speed meets design specifications.

II. Mechanical and Structural Failures
1. Abnormal fan vibration and noise
Causes: Imbalanced blade installation, worn bearings, loose bolts, or a bent drive shaft. Solutions: Retighten bolts; correct static blade balance; replace damaged bearings or drive shafts; apply lubricant to reduce friction.
2. Gearbox oil leakage or gear wear
Causes: Oil seal failure during the break-in period for new equipment or gear aging after prolonged use. Solutions: Regularly inspect oil seals during the break-in period and change the oil after one week of operation; replace worn gears and improve sealing.
3. Water drift and splashing issues
Causes: Damaged drift eliminators, uneven water distribution, or excessive air velocity causing water droplets to spray outward. Solutions: Adjust fan blade angles to reduce airflow; replace damaged drift eliminators; check for water distributor blockages; optimize water pressure distribution.

III. Abnormal Water System Operation
1. Water temperature fluctuations or excessive temperature
Causes: Unstable water flow, spray system malfunction, or high ambient temperature. Solutions: Calibrate the flow control valve, clear clogged spray nozzles, and add auxiliary cooling equipment for high-temperature environments.
2. Rapid drop in water volume
Causes: Clogged water distribution holes, water tank leakage, or makeup water system failure. Solutions: Clean distribution hole filters, repair leaks, and inspect water level sensors and the makeup water mechanism.
3. Water leakage
Causes: Poor packing seal, loose pipe connections, or cracks in the tower structure. Solutions: Reseal packing, tighten pipe connections, and repair cracks using waterproof materials.

IV. Electrical and Control System Faults
1. Motor overload or wiring issues
Causes: Unstable voltage, poor electrical contact, or excessive load. Solutions: Check the grounding system, replace aging wiring, adjust the load to the rated range, and install overload protection devices.
2. Sensor and control parameter anomalies
Causes: Temperature sensor failure or improper parameter settings, causing automatic regulation to fail. Solutions: Calibrate sensor accuracy, adjust operating parameters based on ambient temperature, and upgrade the intelligent control system.

V. Environmental and Maintenance Factors
1. Poor ventilation
Causes: Confined installation location or airflow obstruction by surrounding obstacles. Solutions: Relocate the unit or install air deflectors to ensure unobstructed air intake.
2. Performance degradation due to insufficient maintenance
Causes: Failure to perform regular cleaning, lubrication, or replacement of wear parts. Solutions: Establish monthly/quarterly maintenance plans focusing on fans, pumps, and seals; use long-lasting lubricants.
VI. Other Special Issues
1. Failure of winter freeze protection
Causes: Failure to drain accumulated water or activate heating devices, leading to internal freezing. Solutions: Completely drain water during shutdown; install electric heat tracing systems or add antifreeze.
2. Excessive noise pollution
Causes: Low-frequency fan noise or loud water droplet impact sounds. Solutions: Install sound insulation covers, use low-noise fans, and optimize water distribution methods to reduce droplet noise.