Damper gates for Cement & Building Materials

What we supply for this sector

• Flue gas damper gates and double louvre isolation gates with sealing air
• Round and square air dampers for air and flue ducts
• Slide gates, isolation gates and duct valves
• Spring supports, hangers and sliding supports for ductwork
• Non-standard duct components built to drawing

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Cement kiln lines run hot, dusty gas through preheater towers, raw mills and bag filters, and the dampers must keep working through constant dust loading. We supply gates with dust-shedding blade profiles, external bearings and pneumatic actuation suited to plant air.

The duty

A cement line pulls hot, heavily dusted gas from the kiln through the preheater tower, the raw mill and the coal mill, and finally to a bag filter or an electrostatic precipitator. Temperatures range from 350 °C at the kiln riser down to 120 °C at the filter inlet, and the dust load is measured in hundreds of grams per cubic metre before the first collection stage.

Dust is the design problem

Every pocket in the duct fills. Every horizontal surface collects. Every bearing that is inside the gas path fails. Our gates for cement duty are built with no ledges, dust-shedding blade profiles, bearings mounted outside the duct and guide rails that clear themselves on each stroke.

Plant air actuation

Cement plants almost always have instrument air and rarely have spare electricians, so pneumatic actuation with a solenoid valve and a positioner is the default here. It is simple, it fails to a defined position, and any fitter can change a solenoid. We keep the electric option available but we recommend air where the plant has it.

Wear

Raw mill and coal mill duct gates see the highest wear. Replaceable liners on the blade and hardened inserts in the guide are standard on those positions, and we supply the first spare set with the gate.