ANALYSIS OF NOX FORMATION AT BURNING FUEL OIL AND NATURAL GAS FOR A 80 MW STEAM GENERATOR

In this work has been developed a methodology to determine nitrogen oxides emissions (NOx) in steam generators that burn both fuel oil and natural gas. The methodology is based on four main parameters related to combustion process in the furnace active burning zone (ABZ). Such parameters are the following ones: air excess coefficient in ABZ, average temperature in ABZ, reflected heat in ABZ and the residence time of combustion products in ABZ. As a tool to apply this methodology, there was a specially designed software which was named “NOX AD”. It can calculate the four parameters above as well as the NOx concentration for different operational methods to get a maximized reduction of NOx. The methodology was applied in a 350-ton/h (80MW) steam generator manufactured by Combustion Engineering, which is equipped with tangential burners and is currently working in the thermoelectric plant Ing. Jorge Luque located in the State of Mexico. The fuel oil used has a mass percentage compositio