Industry
Emission Control Materials for Cement Plants
Emission problems, pollutants, operating conditions and recommended materials for the cement sector.
Typical emission problems
- NOx from kiln combustion
- Very high dust loading
- Alkali metals in the dust that deactivate acid sites
- Placement-dependent temperature window
Main pollutants
- NOx
- Dust
- SO₂
Operating conditions
Cement kiln exhaust carries heavy dust with alkali content that can poison catalysts. Large-pitch plate designs reduce plugging; formulation considers alkali resistance.
Recommended material selection
- Plate-type SCR catalyst with large pitch for high-dust gas
- Low cell density honeycomb where dust is controlled
- Low-dust or tail-end placement where the alkali load is heavy — with temperature boosting where needed
Engineering considerations
Cement kiln exhaust is high in temperature, dust and alkali — the classic hard duty for SCR catalysts. Kiln dust contains potassium and sodium that neutralize catalyst acid sites, so deactivation runs faster than in power-plant flue gas unless the design anticipates it.
Catalyst placement options include high-dust (between preheater stages), low-dust (after the dust filter) and tail-end positions. High-dust placement avoids reheating but exposes the catalyst to the full alkali load; low-dust placement protects the catalyst but may need temperature boosting. The economics differ plant by plant.
Dust abrasiveness also drives geometry: plate-type elements with reinforced leading edges are the standard answer where the dust load is high, while honeycomb is reserved for clean positions.
Related products
Tell us about your stream
Gas flow, concentration, temperature, humidity, SO₂ and dust — we will recommend the right catalyst or adsorbent system.