Study on Efficient Ironmaking System Using Syngas From High Temperature Co-Electrolysis of Solar Energy
In this paper,a full-spectrum solar energy utilization ironmaking system with SOEC co-electrolysis for syngas is proposed.In this system,a compound parabolic dish is used to achieve full-spectrum utilization.Photovoltaic and solar thermal techniques are coupled with the dish to supply both electricity and heat for efficient syngas production from cavity SOEC,which improves the efficiency of the ironmaking system.An SOEC electrochemical model is developed and vali-dated by comparing and analyzing the predicted voltage with the experimental data.In addition,a thermodynamic model to simulate the entire system is also developed by coupling the SOEC model with thermodynamic models for other necessary processes.Based on the proposed system model,parametric analyses are conducted to investigate the effects of operating condition parameters on the system performance.The energy consumption of ironmaking is reduced to 24.54 kJ/g under the conditions of 1100 W/m2 solar energy input,775℃ SOEC temperature and 1000 A/m2 current density,which provides a reference for further optimizing the design of the solar-to-syngas reduction ironmaking system.
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