Melting raw iron in blast furnace operated with oxygen or in melting reduction system, comprises recirculating scrubbed raw gas removed from reduction region by adding hydrocarbons into the region, and mixing the raw gas with hydrocarbons

摘要

The method comprises recirculating scrubbed raw gas (GG, EG) removed from a reduction region by adding hydrocarbons into the reduction region, and mixing the scrubbed raw gas with hydrocarbons and then blending with reduction gas (REDG) that has a temperature over 1000[deg] C and is obtained by the partial oxidation of hydrocarbons using oxygen gas having an oxygen content of more than 90 vol.% to form a recirculation gas (REZG) having a temperature over 800[deg] C. The recirculation gas (REZG) is recirculated into the reduction region after an auto-reformation process. The method comprises recirculating scrubbed raw gas (GG, EG) removed from a reduction region by adding hydrocarbons into the reduction region, and mixing the scrubbed raw gas with hydrocarbons and then blending with reduction gas (REDG) that has a temperature over 1000[deg] C and is obtained by the partial oxidation of hydrocarbons using oxygen gas having an oxygen content of more than 90 vol.% to form a recirculation gas (REZG) having a temperature over 800[deg] C. The recirculation gas (REZG) is recirculated into the reduction region after an auto-reformation process, which takes place in a reformer (11) filled with corresponding catalyst. The recirculation of the recirculation gas takes place over the tuyeres with fine carbon injection. The recirculation gas is introduced in the level over the tuyeres or in a duct of a blast furnace. The hydrocarbons are hydrocarbons of C nH mor its mixtures. A heat recovery takes place from the raw gas. A dry dedusting of the raw gases takes place for cleaning the raw gases.