Fans and Air Pollution Control for Vertical Roller Raw Mills

The process

A vertical roller mill grinds and dries raw meal in one body, with hot kiln gas drawn up through the table and separator by the mill fan. The fan carries the full product stream to the bag filter or cyclones, so the dust load is the heaviest on the line and the wheel is built for wear.

The gas

Hot gas that has dried the raw meal and now carries the fine product toward the separator and collector. Very heavy fine dust loading; the impeller is built for wear and balanced to tolerate build-up.

Fans in this process

Duty	What it does here	Type usually selected
Raw Mill Fan	Draws hot kiln gas through the raw mill and separator, drying the raw meal on the way and carrying the fine product to the collector.	Backward curved and radial tipped
Bag Filter Fan	Pulls the process gas through the filter bags and discharges the cleaned gas to the stack.	Backward curved and radial tipped
Dust Collector Fan	The fan behind a bag filter, cyclone or multiclone on a dust extraction system.	Backward inclined and radial tipped
Air Slide Blower	Supplies low pressure aeration air to the fabric of an air slide, fluidising cement, raw meal or gypsum so it flows down the slide..	Backward curved and radial tipped
High Pressure Blower	Delivers combustion, aeration and conveying air where the system resistance runs to several thousand millimetres of water column in a single stage..	Backward curved and radial tipped

Air pollution control

Industries

Related processes