Precautions for Routine Maintenance of Cooling Towers

Key Points for Daily Maintenance of Cooling Towers

1. Operating Records

Upon the construction, installation, and commissioning of a circular cooling tower, the manufacturer is required to furnish comprehensive data on all its characteristics. This includes thermal properties, resistance characteristics, water load, heat load, ambient temperature (both dry bulb and wet bulb temperatures), cooling range, air volume, power consumption, water evaporation rate, water replenishment rate, concentration ratio, fan power consumption, and water pressure entering the tower. These parameters should be systematically recorded by the relevant competent departments of the user unit.

2. Measuring Instruments and Methods

To assess the operational effectiveness of the cooling tower or evaluate its cooling capacity, it is essential to conduct either indoor tests or on-site identification tests on the operational cooling tower. This necessitates not only the presence of skilled technical personnel for testing and research but also a complete set of standardized test methods and a comprehensive array of test instruments and meters (some with spare parts). These may include thermometers, micro-manometers, pressure gauges, sound level meters, among others.

3. Fan and Its Transmission Device

• Fan and Drive Shaft: Regularly inspect the fan blades for any damage or abnormal conditions. When examining the drive shaft and coupling, ensure they remain straight and level.
• Gear Reducer: Periodically check the oil level and oil quality in the gear reducer. Utilize seasonal temporary shutdowns to change the oil and inspect various components thoroughly.

4. Cooling Water Collection Tank

• Cold Water Tank: Maintain an adequate depth in the cold water tank to prevent cavitation, with a freeboard height ranging from 15 to 30 cm. The water level should be kept at a specified level; otherwise, adjustments to the auxiliary water valve are necessary. For cross-flow cooling towers, if the operational water level falls below design requirements, install a deflector beneath the original water surface to prevent air bypass.
• Cleaning and Inspection: Irregularly clean the cold tank to remove sludge and deposits accumulated at the bottom, debris from the filler and its supports, and keep the pump inlet grille clean. Regularly inspect the collection tank for leaks. During maintenance, pay special attention to the proper functioning of acid, chlorine, and water stabilizer dispensers.

5. Hot Water Distribution System

To maintain a clean and unobstructed hot water system, including regulators, voltage stabilizers, water delivery and distribution pipes, nozzles, and sprinklers, adjust the water flow in each tank of the distribution pool to achieve uniform water depth (ranging between 100 and 150 cm). In the event of significant changes in the circulating water entering the tower, corresponding adjustments should be made to the water distribution pipes and nozzles.

In conclusion, adhering to these routine maintenance precautions for cooling towers is crucial for ensuring their efficient and reliable operation, prolonging their service life, and minimizing downtime and repair costs.

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