OCR Text |
Show Xco mole ratio of C 0 2 in gas (kmol per kmol dry gas), 1 Xt mole ratio of species i in gas (kmol per kmol dry gas), 1 X N 0 mole ratio of N O x in gas (kmol per kmol dry gas), 1 X0 mole ratio of O2 in gas (kmol per kmol dry gas), 1 y coordinate normal to the front furnace wall, with y = 0 at that wall, m ; or, in the strong-jet/ weak-jet model, coordinate parallel to the burner wall and to the plane containing the fuel and air port axes, with y = 0 on the air port axis, m yc position y at the confluence of the fuel and air jets in the strong-jet/weak-jet model, m ym position^ of the apogee of the fuel jet trajectory in the strong-jet/weak-jet model, m z coordinate normal to the furnace floor, with z = 0 at the floor, m P\2 angle between the fuel and air port axes, rad 8\2 angular separation, about the burner axis, between centres of exit of adjacent fuel and air ports, rad Ahc = Ah° , standard specific enthalpy of combustion of fuel (abbreviated notation), J/kg E excess air factor, 1 0\ angle between a fuel port axis and the burner axis or the normal to the burner wall, rad 02 angle between a air port axis and the burner axis or the normal to the burner wall, rad p density, kg/m3 pa air density at burner exit, kg/m3 Pf fuel density at burner exit, kg/m3 Pj px orp2 (same as pa and pj), in the strong-jet/weak-jet model, kg/m p^ density of the ambient gas (recirculating combustion products) in the strong-jet/weak-jet model, kg/m3 <pf = (1 + if1, fuel equivalence ratio, 1 yf\i ~GX IG2, fuel/air momentum flux ratio, 1 References Becker, H. A. & Booth, B. D., Mixing in the interaction zone of two free jets, AIChE Jour. 21, 949-958(1975) Becker, H. A., Grandmaison, E. W., Pollard, A., and Sobiesiak, A., Performance of gas-fired industrial burners in real furnace environments, including pollutant emissions, C A G CT Technical Report TR.95.5, Final Report on a shared-cost contract for Natural Resources Canada ( C A N M E T Division) and British Gas pic, 1996 28 |