3. Working condition analysis is to ensure that the residence time of the flue gas in the furnace cavity reaches 850°C not less than 2 seconds, and based on past experience, the adiabatic flame temperature is 1234°C and the critical heating value of garbage is 4598kJ/kg (1100kcal/kg). Considering that the thermal efficiency of the steel furnace is 80%, if the flame temperature is to be maintained at 1234°C, the calorific value of the waste should be maintained not less than 5748k/kg (1373kcal kg).