A company which produces inert building materials expanded the capacity of their limestone quarry by integrating a new secondary impact crusher and converting their existing open process into a closed crushing and screening circuit. This process upgrade drastically increased the volume of circulating material, necessitating a completely new, heavy-duty dedusting infrastructure. Key challenges included: extracting dust from crushers and screens processing non-dried limestone at ambient conditions required precise aerodynamic balancing to ensure adequate suction at every single node; conveyor belt drop points required localized extraction to prevent fugitive dust from escaping into the wider plant environment; and the ducting and structural steel required advanced anti-corrosion protection suitable for a demanding, moisture-exposed outdoor environment.
PM Engineering engineered a dual-strategy system, combining a centralized main baghouse with decentralized, localized filters. A PM 90 TF33RC pulse-jet baghouse was designed and installed handling 8,500 m³/h of dust-laden air, with an integrated screw conveyor discharging continuously through an HT 350 rotary valve to handle the high volume of captured dust. To eliminate fugitive dust, four independent, top-mounted self-cleaning filters (1,200 m³/h each) were installed directly at the conveyor belt transfer points. The entire ducting network was manufactured using 4 mm thick S235JR carbon steel; the exterior was sandblasted (SA 2.5), primed with a zinc base, and sealed with two layers of heavy-duty polyurethane paint.
