Experimental investigation on syngas reburning process in a gaseous fuel firing semi-idustrial combustion chamber

It has been reported that reduction of NO by synthesis reburning fuels reached level up to 80% for low and 45% for medium calorific fuels in case of methane as primary fuel. The high calorific value of synthesis fuel (17.2 MJ/Nm3) introduced to the combustion chamber as a reburning agent caused an increase of NO formation especially in case of low primary nitric oxide emission (an increase of 27% - 60 ppmv). The application of reburning process to the Zonal Volumetric Combustion (ZVC) technology allowed to achieve around 43% reduction of nitric oxide emission in case of medium calorific syngas and excess of primary air value equal to 0.5. For the same fuel, with the excess of primary air equal to 0.1 (proffered by ZVC) the decrease of NO was lower, only up to 14%. The highest reduction was observed for low calorific syngas with the highest concentration of ammonia (more than 60% reduction).