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|Basic principles of stack injection are outlined and supported by calculations of thermal, chemical and aerodynamic requirements of an ideal 4000 tpd furnace. Calculated results show that these requirements vary with conversion of FeO, and that best performance may be expected with XFeO = 1.0 for which calculated production is 6919 tpd and coke rate is only 211 kg/thm. Calculations are also presented for a cycled injection. Discussions show that stack injection is a good way of overcoming softening problems and meeting the demand for iron in a fluctuating demand situation when it exceeds the maximum capacity of a furnace.|