Development of H2 Production Process with Utilization of Steelmaking Slag
The amount of CO2 emitted from steelmaking industry occupies approximately 13 ％ of total CO2 emission in Japan, and thus the development of environmental-friendly ironmaking and steelmaking processes is one of the urgent issues. Currently, most of by-products such as slags, gas, dust and so on, are efficiently utilized as much as possible. However, the heat which many by-products have at high temperatures at discharge from the processes is not utilized completely, and especially the heat associated with the slags is not utilized at all. The amount of waste heat from converter slag is estimated to be 2.4×1016 J, which is equivalent to the annual energy consumption of 570,000 families in Japan. Therefore, this unharnessed energy should be efficiently recovered and utilized in steelmaking industry or in society for the reduction of total energy consumption and CO2 emission. Converter slag contains 15 to 30 mass％ of FeO normally, and thus the function of FeO as a reducing agent of H2O gas is expected; 2FeO (in slag) + H2O (g) = Fe2O3 (in slag) + H2 (g). Since the above reaction is exothermic, the supply of heat energy for operation of this process would be unnecessary, or only a little heat supply would be required. Therefore, the necessary heat energy could be supplied via discharged converter slag at molten state. The ultimate target of this research is to develop the new H2 production process by utilizing unused thermal and chemical energy of converter slag without any other energy supply. In the present study, our recent researches regarding development of H2 production process with steelmaking slag were reviewed; firstly the simulation of thermodynamic conditions required for process operation and secondly the measurement of kinetics of the production of H2 gas from water vapor by converter slag containing FeO by laboratory-scale experiments. The equilibrium between Ar-H2O gas and CaO-FeO-SiO2 slag was calculated with various conditions in composition and temperature. The produced amount of H2 gas increased with increasing initial slag and gas temperature, the partial pressure of H2O, and FeO content of slag. The slag weight increased by blowing Ar-H2O gas and FeO was oxidized to Fe2O3. The exhaust gas analysis by a quadrupole mass spectrometer confirmed the generation of H2 gas.
ironmaking steelmaking green energy water vapor slag utilization
Hiroyuki MATSUURA Makoto SATO Fumitaka TSUKIHASHI
Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Chiba, 277-8561 Japan
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-10
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）