کاتالیست های ریفرمینگ احیاء مستقیم

توضیحات: کاتالیست های ریفرمینگ احیاء مستقیم DRI (Direct Reduced Iron) production plant is an ironmaking unit, developed for the production of direct reduced iron. It is a gas-based shaft furnace process with a solid-state reduction process which reduces iron ore pellets or lump ore into DRI without their melting using reducing gases. The reducing agents, namely hydrogen (H2) and carbon monoxide (CO), remove oxygen from the chemical structure of the iron ore pellets inside the shaft furnace at high temperatures. In order to make a high-quality DRI, a reducing gas rich in H2 and CO with specified molar ratio needs to be produced via reforming reaction of the natural gas with carbon dioxide and steam. Besides reforming reaction, many others take place inside the reformer tubes which is filled with catalysts. Regarding the severe conditions in the reformer, i.e. high temperature, low pressure, low steam to carbon ratio and high CO2 content in the reformer feedstock, two types of catalysts with different activity over an inert bed layer should be loaded to avoid catalyst deactivation with time. The top catalyst is the one with higher nickel content and activity, based on α-alumina, which is called highly active catalyst and the other with lower nickel oxide and activity on rugged magnesium oxide carrier is called the semi-active catalyst. KhTD proposes three catalyst codes, i.e. DRI-6HGRR-HA-01 for high active catalysts, DRI-1HRR-SA-01 for semi-active catalysts & DRI-1HR-I-01 for inert materials.