How Closed-Circuit Cooling Towers Work
2021-08-23
The key difference between this system and an open cooling tower is that the closed cooling tower uses coils to facilitate heat exchange between the medium being cooled and the external cooling water and air, creating a closed-loop system. This design prevents direct contact between the cooled medium and air, thereby avoiding contamination—and the resulting issues like medium wastage, equipment clogging, and other malfunctions that could disrupt normal operations. This equipment is ideally suited for use in harsh environments such as arid regions, areas with water scarcity, or locations frequently affected by sandstorms. It can be seamlessly integrated into various industrial applications, including instrumentation systems, medium-frequency induction furnaces and converters used in metallurgy, power plant generator sets and steam turbine units, nuclear power stations, substations, chemical processing facilities, pharmaceutical manufacturing, welding operations, aluminum rolling processes, copper foil production, and even cooling oil systems for large-scale hydraulic machinery in industrial settings.
Closed-Loop Cooling Tower Components and Their Applications
Cooling fans: Available in FRP, carbon steel with plastic coating, or stainless steel, tailored to meet various customer requirements; offering standard and variable-frequency models with high airflow and low noise levels.
Dehydrator: Designed to conserve precious water resources, a dehydrator has been specially installed at the bottom of the fan unit, effectively minimizing water drift losses.
Water supply system: The main water pipes are made of PVC, and the pump used is a low-head, high-flow, low-power, low-noise pipeline pump.
Air intake louvers: Made from PVC or carbon steel in various shapes, depending on the application, these louvers ensure unobstructed airflow while preventing direct sunlight from entering—thus avoiding the proliferation of algae and the growth of harmful microorganisms in the cooling water.
Automatic water-refilling system: To compensate for water loss due to evaporation, an automatic refilling device is installed, offering convenience and flexibility.
Filter screen: To prevent the pump from clogging and shutting down, a filter screen is installed at the water inlet to block weeds and other debris from entering the pump and causing operational failures.
Housing: To withstand harsh environments, the equipment housing can be manufactured in various forms according to customer requirements, including carbon steel with powder coating, stainless steel, hot-dip galvanized sheet with powder coating, and internally hot-dip galvanized with externally applied powder coating.
Spray water: Equipped with high-flow spiral nozzles. These nozzles feature large flow rates, zero clogging, even water distribution, and no dead zones.
Heat exchanger coils: Available in materials such as stainless steel tubing, copper tubing, carbon steel tubing, and aluminum alloy tubing, depending on specific application requirements. Tube shapes include oval tubes, threaded tubes, and corrugated tubes. After fabrication, carbon steel tubing undergoes full-length hot-dip galvanization for superior corrosion protection.
Water collection tank: Available in stainless steel, carbon steel with plastic coating, or hot-dip galvanized steel with plastic coating, depending on application requirements—offering high strength and an extended service life.
This system employs a closed-loop circulation, effectively preventing scaling inside the cooling tubes that could lead to blockages and damage electronic components (such as vacuum tubes, thyristors, chokes, induction coils, capacitors, and more).
It is used in high-frequency and medium-frequency quenching equipment to ensure stable quenching fluid quality and minimize losses. The system incorporates multi-stage, segmented filtration with stepwise pressure control. Additionally, the softened water used for cooling and the quenching fluid itself are cooled within the same unit, eliminating the need for separate equipment and avoiding extra costs.
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2025-09-17