Abstract: In order to evaluate the secondary energy efficiency in steel and iron enterprise, the overall design ideas of modeling, simulation, evaluation and optimization were adopted. Considering the international and national standards, object process methodology was used to model and simulate the secondary energy utilization process and comprehensive energy consumption index was given to evaluate the process. Finally, the evaluation ideas were applied for detailed analyzing the byproduct gas used in steel and iron enterprise and evaluating the energy efficiency.  

Key words: steel and iron enterprise, secondary energy, object process methodology (OPM)； comprehensive energy consumption