TY - JOUR
TI - CO emission reduction of a HRSG duct burner
AU - Lezsovits Ferenc
AU - Könczöl Sándor
AU - Sztankó Krisztián
JN - Thermal Science
PY - 2010
VL - 14
IS - 3
SP - 845
EP - 854
PT - Article
AB - A heat-recovery steam generator was erected after a gas-turbine with a duct  burner into the district heat centre. After commissioning, the CO emissions  were found to be above the acceptable level specified in the initial  contract. The Department of Energy Engineering of the BME was asked for their  expert contribution in solving the problem of reducing these CO emissions.  This team investigated the factors that cause incomplete combustion: the  flue-gas outlet of the gas-turbine has significant swirl and rotation, the  diffuser in between the gas-turbine and heat-recovery steam generator is too  short and has a large cone angle, the velocity of flue-gas entering the duct  burner is greater than expected, and the outlet direction of the flammable  mixture from the injector of the duct burner was not optimal. After reducing  the flow swirl of flue-gas and modifying the nozzle of the duct burner as  suggested by the Department of Energy Engineering of the BME, CO emissions  have been reduced to an acceptable level. The method involves the application  of CFD modeling and studying images of the flames which proved to be very  informative.