Dry Fluid Coolers In Power Plant
Fluid coolers are used in fossil power plants to cool the working fluid after it has been used to generate electricity in the Rankine cycle.
Dry-cooled systems use air rather than water to cool the steam entering a turbine and can reduce overall power plant water use by more than 90%, albeit they are more expensive and have lower efficiency than wet-recirculating systems.
The working fluid of a wet-recirculating system, also known as a closed-loop system, is cooled by water in a cooling tower or pond before being recirculated back into the power plant process. Typically, cooled water is sprayed onto the surface of a heat exchanger or cooling coil, where it flows through a network of tubes and fins designed to promote heat transfer. A fan then draws air across the surface of the heat exchanger, removing heat from the water and transferring it to the atmosphere. After cooling, the water is recirculated back into the power plant process.
The working fluid of a dry-cooling system is cooled by air drawn across the surface of a heat exchanger or cooling coil. The hot air is then expelled into the atmosphere, while the cooled fluid is recycled back into the power plant process. Because dry-cooling systems do not require water, they can be utilised in locations where water is scarce, albeit they are less efficient and can be more expensive than wet-recirculating systems.
Overall, fluid coolers play an important part in the operation of fossil power plants, assisting in the maintenance of safe and efficient working fluid temperatures. A variety of factors will influence cooling system selection, including water availability, environmental requirements, and financial concerns.
In addition to wet-recirculating and dry-cooling systems, hybrid systems incorporate the advantages of both technologies. A closed-loop dry-cooling system, for example, employs a heat exchanger to transfer heat from the working fluid to a closed-loop system of air-cooled radiators. Fans move air across the surface of the air-cooled radiators to cool them, and the heated air is subsequently vented to the atmosphere. After cooling, the fluid is recirculated back into the power plant process. This method offers some of the advantages of a dry-cooling system, such as reduced water use, while preserving the efficiency of a wet-recirculating system.
Fluid coolers are also employed in various industrial processes where heat exchangers are used to cool process fluids, such as oil refining and chemical manufacture. Fluid coolers in these applications may employ water or air as a cooling medium, depending on the process's specific requirements.
