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A low NOx burner, developed for the reduction of nitrogen oxide emissions from pulverised coal combustion, is described. This burner is equipped with two fuel compartments separated by secondary air nozzles. Coal flowrate within each fuel compartment can be adjusted, enabling the primary air/pulverised coal ratio to be changed, to create a fuel-rich and a fuel-lean zone. A flue gas recirculation device allows flue gas recirculation independently of the fuel and air nozzles. Staged combustion with over-fire air was simulated. Three coal types were burnt during the tests. For each coal, standard and low NOx combustion were performed. Emission abatements between 65 to 75% were observed at high coal concentration without any significant adverse effect on combustion rate.

Additional information

Authors: MAURY P, Stein Industrie, Velizy-Villacoublay (FR)
Bibliographic Reference: EUR 13132 EN (1990) 111 pp., MF, ECU 8
Availability: (2)
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