アイアンカーバイド（Fe₃C）を使用した鉄と水素の併産システムの開発

抄録

Steel making process consumes a lot of energy and exhausts carbon dioxide. From this point of view, scraps shall be recycled and used more for steel making. In case of using scraps, virgin iron source such as direct reduced iron (DRI) is required to dilute impurity of recycling scraps. Iron carbide (Fe₃C) is one of DRI having characteristics such as non-pyrophoric and carbon carrier. As conventional method, iron carbide is directly charging into electric arc furnace and smelting to produce steel with energy generation by converting carbon into carbon monoxide. This paper presents alternative method of using iron carbide. At around 700 degree C, iron carbide is producing iron (Fe) and syngas (mainly H₂ and CO) reacting with steam. Applying this characteristic to steel making process, iron is charging into electric arc furnace and hydrogen (or electricity) is supplied to users. As a result, energy consumption and CO₂ generation can be reduced by co-production of iron and hydrogen. Base on this concept, reaction test and conceptual design of this process were carried out and the results are introduced on this paper.