Advanced Screw Cooler for CFB Boilers Enhances Ash Handling Safety and Efficiency
Release time:
Nov 19,2025
In the power and thermal energy sector, handling high-temperature ash from Circulating Fluidized Bed (CFB) boilers is a critical operational challenge. The screw cooler for CFB boilers is a specialized engineered solution designed precisely for this demanding task.
In the power and thermal energy sector, handling high-temperature ash from Circulating Fluidized Bed (CFB) boilers is a critical operational challenge. The screw cooler for CFB boilers is a specialized engineered solution designed precisely for this demanding task. This equipment is pivotal for managing boiler ash with discharge temperatures soaring up to 950°C, effectively cooling it down to a safe handling temperature of 200°C or lower. This efficient cooling is essential, as it allows the cooled ash to be transported reliably, either pneumatically or mechanically, to storage silos without risking damage to downstream equipment.
The core mechanism of a typical screw cooler for CFB boilers involves a rotating helical screw blade, coiled around a central shaft, which operates inside a jacketed U-trough. As the screw rotates, it concurrently conveys and cools the hot ash. The unit is often installed at a slight incline to optimize material movement. The volumetric transfer rate is directly proportional to the shaft's rotational speed, which is precisely managed through a Variable Frequency Drive (VFD) for optimal process control.
To cater to different plant capacities and ash rates, the internal design of a screw cooler for CFB boilers is primarily offered in two configurations. The first is the solid flight design, where the heat transfer surface is limited to the jacketed trough and the shaft. The second, more efficient type is the hollow flight design. In this model, the hollow flights themselves are channels for the cooling medium, significantly increasing the total heat exchange surface area and boosting cooling performance for high-throughput applications. Selecting the appropriate screw cooler for CFB boilers is therefore crucial for achieving optimal thermal efficiency and operational reliability in ash handling systems, making it a vital component for modern CFB boiler plants aiming for enhanced safety and continuous operation. The robust design of a high-performance screw cooler for CFB boilers ensures long-term durability and minimal maintenance.
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