TITLE : COMBUSTION AND NOx MODELLING FOR 2-D TURBULENT FLAME

BY : Radian Corporation - P Adnani CHAM Development Team - M R Malin

FOR : Radian Corporation, Irvine, USA

DATE : 1994 PHOENICS Version : 2.1

MODEL OBJECTIVES :

• The main objective of the model is to predict the NOx formation when combustion products from gas-fired burners, operating at different stoichiometries, are mixed in a large utility boiler.

• The model may be used to help determine the optimum firing condition for each burner in a utility boiler.

FLOW DETAILS :

The model is intended for inclusion in a 3D test-boiler BFC geometry, but was developed on a 2D pipe geometry with somewhat arbitrary operating conditions, as indicated below:

• 2D steady turbulent diffusion flame in a pipe of 0.32m diameter and 2m length.
• Cylindrical-polar mesh with 40 radial and 20 axial cells.
• Coaxial fuel and oxidiser streams are admitted separately into the pipe and then they burn in a turbulent diffusion flame.
• The fuel jet enters through a pipe of 0.16m diameter and comprises 2 fuels (CO and H2), N2, CO2 and H2O at a temperature of 1754 C.
• The oxidiser jet enters through an annulus and comprises O2, N2, CO2 and H2O at a temperature of 1518 C.
• The oxygen supply is 66% above stoichiometric.

MAIN FEATURES OF MODEL: