Multi-Faceted Hollow Ball | Polypropylene Hollow Ball

Working Principle Once packed into a tower, the balls leave a large amount of irregular void space between them, where gas and liquid contact each other in a countercurrent flow. Liquid spreads into a thin film along the ribs on the ball surface, while gas passes through the gaps. That gives a large contact area and high mass transfer efficiency. In biological tanks, microorganisms attach to the inner and outer surfaces to form biofilm. Water flow and aeration keep the balls tumbling, and pollutants get adsorbed and broken down. Application Fields 1.Chemical towers: gas-liquid mass transfer in absorption, decarbonization, and scrubbing towers. 2.Exhaust gas treatment: absorption and purification of acid mist, ammonia, and similar emissions. 3.Water treatment: biofilm carriers in biological tanks for domestic and industrial wastewater. 4.Cooling towers: air-water heat exchange during hot water cooling. FAQ Q1: What material are multi-faceted hollow balls usually made of? A: Polypropylene is the go-to, though polyethylene and reinforced nylon are also used. PP resists acids and bases, handles temperatures up to about 80°C, and costs less, so it's the most common choice. For highly corrosive media or higher temperatures, reinforced nylon or PVDF are options, but they cost more. Q2: How do they compare with Raschig rings and Pall rings? A: Raschig rings are simple but have high resistance and only average mass transfer efficiency. Pall rings have windows cut into the ring wall, giving better throughput and efficiency than Raschig rings. Multi-faceted hollow balls are spherical, so they have a higher void ratio and lower gas resistance, but their mass transfer efficiency doesn't match Pall rings. They fit situations where high throughput matters more than peak efficiency. Q3: What should be watched when loading them? A: Clean out any debris in the tower first, and check that the support plate gaps are smaller than the ball diameter so they don't fall through. Load them evenly—too dense or too loose in one spot can cause gas channeling. If the balls have a directional shape, it's best to align them, but multi-faceted hollow balls are typically dumped in randomly and don't need careful arranging.