生質煤於煉鐵製程應用之可行性探討

在追求鋼鐵生產低排碳的思維下，中鋼公司積極投入碳熱還原煉鐵和生質材低溫炭化之製程技術研發。過去研究發現，焙燒可提昇生質物碳含量與熱值，但焙燒後生質物於鋼鐵冶煉之應用則有待研發。鑑於此，本研究完成了一系列鐵礦碳熱還原試驗，使用之生質煤以油棕果短纖顆粒低溫炭化（焙燒）製備，焙燒溫度250~450℃，時間0.5小時；碳熱還原試驗球團以（C/O）_(mol)=1比例摻配，將生質煤粉和鐵礦粉混拌壓製成顆粒，再置於熱重分析儀內，以1,200℃進行碳熱還原。試驗結果顯示，使用生質煤作為還原劑，其產物金屬化率為95.2~96.6%，與使用無煙煤者接近，但可節省44.4%反應時間，比直接使用未焙燒生質物者節省14.5%還原劑。基於上述結果，使用生質煤於鐵礦碳熱還原，可降低CO_2淨排放量並提升鐵礦碳熱還原反應效率。

關鍵字

碳熱還原；煉鐵；生質物；焙燒

並列摘要

To pursue low carbon emission of iron and steel production, CSC has been developing the innovative process technologies in iron-making and biomass torrefaction, respectively. In previous research, it was found that torrefaction can promote the carbon content and heating value of the biomass, carbon neutral material, quickly and effectively. In this study, the feasibility of the replacement of fossil coal with torrefied biomass in the carbothermic reduction ironmaking process was evaluated. A series of experiments of the carbothermic reduction experiment were carried out. Bio-coal samples were prepared from oil palm fiber pellets via the torrefaction process. In experiments, the torrefaction temperatures were 250-450℃, the torrefaction time was 0.5 hours. (C/O) mole ratio of the specimen is 1.0. Thermalgravimetric analysis was conducted for the cylindrical-shaped specimen at 1,200℃ for 30 mins. The experiment result indicates that the metal yields of the carbothermic reduction using bio-coal as a reduction agent can reach 95.2-96.6%. Moreover, the reaction time can be shortened about 44.4%, and the consumption of the reduction agent can be reduced about 14.5% comparing with raw biomass. According to the result, using torrefied biomass on carbothermic reduction iron-making process can not only reduce CO_2 emissions but also enhance the carbothermic reduction efficiency.

並列關鍵字

carbothermic reduction ； iron-making ； biomass ； torrefaction

國際替代計量

生質煤於煉鐵製程應用之可行性探討

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