Raw Mill/ Kiln
Membrane laminated fiberglass bags have become industry standard at this application for the following reasons:
Reduce fan energy costs
Increased bag life
Reduce equipment downtime & maintenance
Reliably meet emissions regulations
Better mill sweep, and less water spraying
High temperatures, combined with alkaline and acidic gases make selection of right filter media critical at this important baghouse.
Dust To be handled: Kiln/raw mill gases
Nature of dust: Fine, free-flowing, mildly abrasive
Typical Gas temperature: 90-240 Celsius
Typical Surge Temperature: 260 Celsius
Dust Load: 30-80 g/Nm3
The raw mill grinds limestone, clay or shale into “Raw Mix” which is then fed to kiln through preheater. As the mix travels through the rotary kiln, its temperature rises gradually. Flue gas generated in pyro-processing travels in a direction opposite to material flow. Kiln exit gases contain pollutants like SOx and NOx. At preheater outlet, flue gas temperature ranges around 350 Deg C and is brought down by inducing dilution air or water cooling when the Raw Mill is down.