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Due to the different structural forms of cooling towers, the corresponding main icing positions will also be different. According to the way of water and air contact, mechanical ventilation cooling towers can be divided into open cooling towers and closed cooling towers. At the same time, according to the direction of water and airflow, cooling towers can be divided into cross-flow cooling towers and counter-flow cooling towers. We have Cooling Tower Filler Media for sale.
Cross Flow Cooling Tower Filler
The occurrence of icing has a great impact on the service life and working performance of the equipment. If icing occurs at the air inlet, then with the accumulation of ice cubes, the weight of the ice cubes gradually increases, which can easily cause the shutters to be damaged, making them lose their air-guiding efficiency. If the freezing position occurs in the water collecting tray, the increase in the volume of ice cubes during the icing process will cause the glass fiber reinforced plastic collecting tray to rupture due to the expansion force, causing water leakage.
The working principle of the open cooling tower: The cooling water is pressurized by the water pump to absorb heat from the cooling object and enter the cooling tower through the water pipe. It is evenly distributed to the filler through the spray wheel system. The hot water flows through the filler by its own gravity and falls to the bottom of the tower. The pool becomes the required cooling water for reuse. The air enters the tower from the air inlet, passes through the cooling water under the filler, passes through the filler in the opposite or vertical direction to the hot water, and is discharged from the wind cylinder through the water collector, fan. Open-type cooling towers have better cooling effect because water and air are in direct contact with each other. In addition, this type of cooling tower has low cost and is currently the most widely used cooling tower.
The working principle of the closed cooling tower: cooling water flows in the cooling coil, on the one hand, it forms cooling by contacting with the temperature difference between the air outside the tube and heat transfer. On the other hand, by spraying water in contact with the coil, the fluid in the coil is evaporated and dispersed. Anti-freezing measures for open cooling towers and closed cooling towers:
The cooling coil circulating water temperature must be maintained at or above 7 ° C. When there is no heat load on the circulating water of the closed system, freezing will occur even if the circulating water keeps flowing. There must be proper anti-freezing measures for the closed cooling tower. Generally, the following three methods are considered to be the most suitable:
A. Let the circulating water maintain a certain heat load. Generally, immersion electric heaters can be installed in the piping system or electric heat tracing can be installed on the pipelines. At the same time, the circulating water in the closed system maintains an appropriate flow rate and passes the temperature sensor and control. System to achieve real-time temperature monitoring.
B. Fill the cooling coil with antifreeze, ethylene glycol or propylene glycol.
C. If the downtime is short or slightly longer, you can switch the pipeline fluid circulation by setting an automatic bypass heating system to maintain a certain thermal load on the fluid in the pipeline.
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