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The Gypsum “Concentration Master”: How Cyclones Lighten the Load for Flue Gas Desulfurization

In wastewater treatment, sand removal is critical for ensuring stable operation of downstream processes.


In flue gas treatment for thermal power generation and industrial smelting, the limestone-gypsum wet desulfurization technology stands as one of the most widely adopted desulfurization processes globally. Within this massive purification system, the gypsum cyclone plays a pivotal role as the “concentration master”—functioning like a precise dispatcher to perform critical concentration and classification before the gypsum slurry enters the final dewatering stage.

 

Process Positioning: The Concentration Link Bridging Stages

The gypsum cyclone is positioned in the middle section of the desulfurization process. The gypsum slurry generated in the absorber tower has a low initial concentration. Directly feeding it into a vacuum belt dewatering machine would not only limit processing efficiency but also increase equipment load and energy consumption. The gypsum cyclone's task is to pre-concentrate this dilute slurry—raising its mass concentration from approximately 10% to around 40%—before sending it to a belt filter press for final dewatering, producing finished gypsum suitable for resource utilization. This “concentration enhancement” process enables subsequent equipment to operate at its fullest processing capacity.

 

Structural Features: Flow Path Design Tailored for Gypsum

Compared to standard hydrocyclones, gypsum hydrocyclones feature targeted structural optimizations. Leading products employ a downward-spiraling feed body combined with a multi-tapered cone structure characterized by a small cone angle and extended cylindrical section. This design reduces turbulence when fine particles enter the cyclone chamber, prolongs effective classification time, and enhances multiple classification cycles near the sand discharge port. Through precise calibration of structural parameters, the equipment balances high concentration levels with high classification efficiency while achieving accurate control over separation precision.

 

Regarding material selection, gypsum cyclones commonly utilize SPJ wear-resistant polyurethane. This material offers excellent corrosion resistance and aging resistance, making it suitable for the acidic environment of desulfurization slurry. Additionally, the mold-formed inner surface features high smoothness and concentricity, which helps maintain stable flow patterns and extends equipment service life.

 

Specification Configuration: Selection Logic Aligned with Process Scale

The diameter specifications of gypsum hydrocyclones typically range between 100 mm and 150 mm. This range is closely tied to the desulfurization system's processing capacity—smaller diameters facilitate finer separation particle sizes to meet gypsum crystal grading requirements, while larger diameters offer higher throughput to accommodate slurry production from large-scale units. In practical engineering applications, equipment selection requires comprehensive consideration of slurry properties, processing volume, and compatibility with downstream dewatering equipment to develop customized configuration solutions.

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