Method and apparatus for direct reduction ironmaking

摘要

An apparatus for producing a reducing gas for direct reduction iron-making includes an internal-heating type reformer for reforming a natural gas by adding steam and oxygen to the natural gas and by partially burning the natural gas to generate reducing gas containing hydrogen and carbon monoxide; a remover for removing carbon dioxide from exhaust gas generated in the direct reduction iron-making; and a line for recycling as the reducing gas the exhaust gas from which the carbon dioxide is removed by the remover.

主权项

1. An apparatus of producing a reducing gas to be supplied to a direct reduction iron-making furnace, comprising:
an internal-heating reformer for reforming a natural gas by adding steam and oxygen to the natural gas to supply a mixture of the natural gas, the steam and the oxygen to a catalyst bed in the reformer and by proceeding both an endothermic reaction of a reformation with steam and an exothermic reaction of partial oxidation in the catalyst bed to generate a reducing gas containing hydrogen and carbon monoxide and having a temperature range between 900 and 1,100° C.; a carbon dioxide remover for removing carbon dioxide from exhaust gas discharged in the direct reduction iron-making furnace; an exhaust-gas recycling line for recycling as the reducing gas the exhaust gas from which the carbon dioxide is removed by the remover; a heat exchanger for increasing a temperature of the carbon dioxide-removed gas to a range between 400 and 700° C. with the exhaust gas discharged in the direct reduction iron-making furnace before recycling the carbon dioxide-removed gas as the reducing gas for the direct reduction iron-making furnace; and a line for supplying the exhaust gas discharged from the direct reduction iron-making furnace to the heat exchanger before supplying it to the carbon dioxide remover.