Ecotube® - nitrogen oxides (NOx) reduction installation
Ecotube® technology was introduced and patented in 1992 by the Swedish company ECOMB AB to optimize combustion process and reduce toxic compounds emissions (including NOx and CO) from low and medium power boilers.
Each nozzle is controlled separately to achieve optimal efficiency of NOx reduction under different operating conditions of the boiler. The use of Ecotube® pipes allow to connect the primary method (air stratification) and secondary method (SNCR) of nitrogen oxides (NOx) reduction created during combustion of various gas and solid fuel types in boilers.
In the first zone less NOx is formed because the formed NOx are reduced by reacting with organic compounds, mainly CO in the reduced excess air. In the second zone the nitrogen oxides are reduced by the two-stage combustion process called reburning and additionally by injecting the reactant (ammonia or urea) in SNCR method.
Boiler with Ecotube® pipes
In other words, by using the additional air injection trought Ecotube® the ultimate air-supply system is attained helps to achieved low NOx emission below the limits resulting from IED (Industrial Emission Directive) and the BAT (Best Available Techniques) conclusions. Thus, by obtaining a greater turbulence in the combustion chamber and better mixing of air and fuel the combustion process optimization is achieved. The larger degree of mixing of air and fuel provides to complete oxidation of the fuel and thus very low emissions of CO. It also reduces the share of oxygen in the exhaust gas, and thereby improves the efficiency of the boiler, which leads to reduced fuel consumption and thus lower emission of CO2, dust and lower operating costs. This technology is applicable in all types of boilers burning different fuels solid, liquid and gas.