The Gas Reforming Unit is a critical component within the Integrated Direct Reduction Iron and Electric Arc Furnace Steelmaking System. It processes natural gas or other hydrocarbon fuels to produce a reducing gas mixture (primarily H₂ and CO) essential for the direct reduction of iron ore in the shaft furnace. This unit enables the substitution of coke with natural gas, reducing carbon emissions in the primary ironmaking stage. The unit typically operates on steam methane reforming (SMR) or autothermal reforming (ATR) principles. In SMR, natural gas reacts with steam over a nickel-based catalyst at high temperatures (700-1000°C) to produce syngas (H₂ + CO). The reaction is endothermic, requiring external heat. The produced syngas is then conditioned (e.g., cooled, purified) before being fed to the direct reduction reactor. Key parameters for selection include syngas capacity (5000–50000 Nm³/h), operating pressure (1.0–1.6 MPa), operating temperature (850–1050°C), pressure drop (≤0.05 MPa), thermal efficiency (65–75%), H2/CO ratio (1.5–2.5), carbon conversion (≥98%), and material grade for reformer tubes (Incoloy 800H, ASTM B409). Auxiliary requirements include electrical power (50–200 kW), control voltage (24 V DC ±10%, IEC 61131-2), ingress protection (IP54–IP65, IEC 60529), footprint (200–1000 m²), and dry weight (50–200 t). The unit interfaces with feedstock supply, steam system, heat recovery, and the direct reduction reactor. Verification questions should address actual process conditions, feedstock composition, and compliance with relevant standards. Maintenance signals include catalyst deactivation, tube wall thinning, and pressure drop increase. Failure boundaries include operating outside temperature/pressure limits or exceeding catalyst life. Always verify model-specific values and standards with the legal manufacturer or supplier.
The unit typically operates on steam methane reforming (SMR) or autothermal reforming (ATR) principles. In SMR, natural gas reacts with steam over a nickel-based catalyst at high temperatures (700-1000°C) to produce syngas (H₂ + CO). The reaction is endothermic, requiring external heat. The produced syngas is then conditioned (e.g., cooled, purified) before being fed to the direct reduction reactor.
