| 摘要 |
<p>IN A PROCESS FOR PRODUCING SPONGE IRON BY DIRECT REDUCTION OF IRON-OXIDE-CONTAINING MATERIAL, SYNTHESIS GAS IS MIXED WITH TOP GAS FORMING IN THE DIRECT REDUCTION OF THE IRON-OXIDE -CONTAINING MATERIAL AND IS UTILIZED AS A CO- AND H2- CONTAINING REDUCING GAS FOR DIRECT REDUCTION AND FOR HEATING THE IRON-OXIDE-CONTAINING MATERIAL TO A REDUCTION TEMPERATURE.TO BE ABLE TO SAVE ENERGY IN AN ECONOMICALLY EFFICIENT MANNER WHEN PRODUCING STEEL, ESPECIALLY IN THE REFINING PROCESS, DIRECT REDUCTION IS CARRIED OUT AS FOLLOWS:- IN ADDITION TO THE REDUCING GAS, A CARBON-CONTAINING GAS, SUCH AS NATURAL GAS, OR A GAS HAVING HIGHER HYDROCARBONS IS UTILIZED FOR REDUCTION-THE IRON-OXIDE-CONTAINING MATERIAL FOR A PREDETERMINED PERIOD OF TIME EXCEEDING THE PERIOD NECESSARY FOR COMPLETE REDUCTION IS EXPOSED TO THE REDUCING GAS AND TO THE ADDITIONALLY SUPPLIED CARBON-CONTAINING GAS, AND-A CO/CO2 RATIO RANGING BETWEEN 2 AND 5, PREFERABLY A RATIO IN EXCESS OF 2.5, IS ADJUSTED IN THE REDUCING GAS.</p> |
