SCR
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 catalytic reduction (SCR) is a DeNOx system that injects ammonia or urea into the flue gas and passes it through a catalyst bed, converting nitrogen oxides (NOx) into nitrogen (N₂) and water (H₂O). SCR typically reduces NOx by 70–90%, the highest efficiency among common NOx control technologies. Micro-one designs and supplies low-temperature SCR systems for installation downstream of the baghouse in waste incineration plants.
Typically vanadium pentoxide (V₂O₅) and tungsten trioxide (WO₃) on a titanium dioxide (TiO₂) carrier. It speeds up the reaction and makes it selective for NOx.
Ammonia or urea solution is dosed precisely and mixed evenly with the flue gas.
The housing that carries the gas through the catalyst layers at the right temperature and velocity.
Measures NOx, temperature and flow in real time and adjusts the reagent dose.
Typically 70–90%, and higher with a suitable design.
Nitrogen and water; only ammonia slip needs to be controlled.
Conventional catalysts run at about 250–430°C (480–800°F); low-temperature catalysts run below that range.
NOx reduction for municipal and medical waste incinerators
Boilers, power plants, steel mills and other combustion units
Processes that generate NOx, such as nitric acid production
SCR uses a catalyst at about 250–430°C and typically removes 70–90% of NOx. SNCR uses no catalyst; the reagent is sprayed into the furnace at 870–1,150°C and typically removes 30–50%. SCR is more efficient; SNCR costs less to install. See our SNCR system page.
Dust and acid gases deactivate the catalyst, so incinerators usually place the SCR after the baghouse (tail-end). The gas is cooler there and often needs reheating, which adds operating cost, so Micro-one uses low-temperature catalysts.
Replace the bags in your existing baghouse with CataFill™ catalytic filter bags to reduce dust and NOx together. See the catalytic filter bag vs. SCR comparison.
Planning an SCR project, or considering switching your existing baghouse bags to catalytic filter bags? Send us your flue gas conditions through our inquiry page.
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