SNCR
Alongside its filter bag manufacturing, Micro-one Co., Ltd. designs and builds waste incinerators, flue gas treatment systems and power plant dust collection equipment on an EPC basis. Designs are checked with CFD flow analysis and 3D modeling, and every system can be fitted with Micro-one’s own DuraFill™ and CataFill™ filter bags.
We offer cost-effective consulting tailored to each customer and provide after-sales service once the plant is handed over.
Explore: heat recovery and waste-to-energy plants · flue gas treatment systems · power plant dust control · energy facility operations
Selective non-catalytic reduction (SNCR) is a DeNOx system that sprays urea or ammonia directly into the hot furnace, without a catalyst, converting nitrogen oxides (NOx) into nitrogen (N₂) and water (H₂O). With no catalyst, SNCR is simple and low-cost to install, but it typically achieves 30–50% NOx reduction in the field, less than SCR. Micro-one supplies SNCR systems that inject urea solution through twin-fluid nozzles into the secondary combustion chamber at 950 ± 50°C.
Lower capital and maintenance cost; simple to install and operate.
Ammonia works best at about 870–1,100°C and urea at about 900–1,150°C. Too cold leaves unreacted ammonia; too hot creates more NOx.
Typically 30–50% in field applications.
Overdosing lets unreacted ammonia escape (ammonia slip), which is usually held to 5–10 ppm or less.
Can be fitted to many combustion units with a suitable temperature zone.
Typically 30–50% in the field, depending on furnace temperature, mixing and residence time. Where higher removal is needed, SNCR is combined with SCR or catalytic filter bags.
Unreacted ammonia leaving with the flue gas. It causes odor and can form salt deposits in downstream equipment, so injection rate and location are tuned to minimize it.
Replace the downstream baghouse bags with CataFill™ catalytic filter bags, which use the remaining ammonia to reduce NOx further.
Planning an SNCR system, or considering switching your downstream baghouse bags to catalytic filter bags? Send us your flue gas conditions through our inquiry page.
Copyright © Micro-one Co., Ltd. All rights reserved.