METHOD OF EXCLUSION OF METAL CORROSION (METAL DUSTING) IN DIRECT REDUCTION OF MATERIAL CONTAINING IRON OXIDES (VERSIONS)

FIELD: metal corrosion control. SUBSTANCE: synthesis gas is mixed with blast-furnace gas produced in direct reduction of materials containing iron oxides and used as reducing gas for reduction of materials containing iron oxides. To exclude or reduce metal corrosion (metal dusting) caused by high co...

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Bibliographische Detailangaben
Hauptverfasser:	GERAL'D KERN, VERNER LEOPOL'D KEPPLINGER, ROJ KH'JUBERT VIPP, JOKHANNES SHENK
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CHEMISTRY DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS,IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KINDOF FURNACE FURNACES FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL HEATING KILNS LIGHTING MANUFACTURE OF IRON OR STEEL MECHANICAL ENGINEERING METALLURGY METALLURGY OF IRON OPEN SINTERING OR LIKE APPARATUS OVENS RETORTS WEAPONS
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Beschreibung
Zusammenfassung:	FIELD: metal corrosion control. SUBSTANCE: synthesis gas is mixed with blast-furnace gas produced in direct reduction of materials containing iron oxides and used as reducing gas for reduction of materials containing iron oxides. To exclude or reduce metal corrosion (metal dusting) caused by high content of CO in reducing gas, use is made of simple methods and equipment to maintain CO/CO2 ratio in reducing gas within the preset range of 1:3. In the first version, synthesis gas is used in the form of natural gas and CO/CO2 ratio in reducing gas is regulated by means of regulation of operation of reformer in which steam reforming of natural gas is effected by varying the steam/natural gas ratio. The second version provides for regulation of CO/CO2 ratio by addition of one part of volume of converted gas produced in reformer from steam and natural gas and then supplied to CO-converter to increase content of H2, to blast-furnace gas directly, that is by bypassing CO-conversion in the amount which may be varied. The third version includes cleaning of converter gas and optionally blast-furnace gas from CO2 before their use as reducing gas, and addition directly to reducing gas of at least a part of converted gas without cleaning from CO2. In the fourth version, converted gas and optionally blast-furnace gas may be subjected to cleaning from CO2 and CO/CO2 ratio is regulated by addition directly to reducing gas of at least a part of volume of blast-furnace gas without cleaning from CO2. In the fifth version, converted gas and optionally blast-furnace gas are subjected to cleaning from CO2 before its use as reducing gas. In this case, content of CO2 in cleaned gas is regulated by varying the efficiency of CO2 separation. For the further reduction of metal corrosion (metal dusting), it is good practice to supply to reducing gas at least a part of sulfur present in material containing iron oxides in the form of H