Open AccessSecond Generation Advanced Reburning for High Eficiency NO(x) Control
Author(s) -
Vladimir Zamansky,
Peter M. Maly,
Mark S. Sheldon,
David Moyeda,
Jr Gardiner,
Vitali Lissianski
Publication year - 1997
Language(s) - English
Resource type - Reports
DOI - 10.2172/643524
Subject(s) - sodium carbonate , combustion , boiler (water heating) , coal , chemistry , coal combustion products , natural gas , sodium , waste management , environmental science , chemical engineering , process engineering , engineering , organic chemistry
This project is designed to develop a family of novel NO{sub x} control technologies, called Second Generation Advanced Reburning which has the potential to achieve 90+% NO{sub x} control in coal fired boilers at a significantly lower cost than SCR. The sixth reporting period (January I - March 31, 1997) included both experimental and modeling activities. New kinetic experimental data for high-temperature decomposition of sodium carbonate were obtained in a flow reactor at the University of Texas in Austin. Pilot scale combustion tests in a 1.0 MMBtu/hr Boiler Simulator Facility were continued with firing coal and using natural gas as reburn fuel. The results demonstrate that over 90% NO control is achievable by injecting one or two N-agents with sodium promoters into the reburning zone and with the overfire air. Advanced reburning technologies does not cause significant byproduct emissions. The AR kinetic model was updated to include chemical reactions of sodium carbonate decomposition. Modeling was conducted on evaluation of the effect of sodium on process kinetics in the rebuming zone. This study revealed that increasing or decreasing radical concentrations in the presence of sodium can significantly affect the reactions responsible for NO reduction under fuel-rich conditions. The effect of mixing time on performance with sodium was also evaluated. Initial activities on engineering design methodology for second generation AR improvements are described