Entegre Demir Çelik Fabrikasında Pulverize Kömür Enjeksiyon (PCI) Uygulaması

Yıl 2020, Cilt: 1 Sayı: 2, 55 - 65, 06.12.2020

Ömer Saltuk Bölükbaşı

Öz

Pulverize kömür (PC), metalurjik kok kömürü ile birlikte yüksek fırına şarj edilmekte ancak tamamı ile metalurjik kok kömürü yerine kullanılamamaktadır. Metalurjik kok kömürü yüksek fırın içinde sadece yakıt olarak değil, aynı zamanda fırının gaz geçirgenliğini düzenleme, demir cevheri ve flaks malzemelerinin fırın içinde düzgün dağılmasını sağlama ve termal stresleri azaltma gibi işlevleri de yerine getirmektedir. Pulverize kömür enjeksiyon (PCI) sisteminin de yüksek fırına, pozitif ve negatif bazı etkileri vardır. Olumsuz etkileri yok etmek veya en az seviyeye indirmek, olumlu etkilerinden de en iyi şekilde yararlanmak gerekmektedir. PCI’unun yüksek verimle kullanabilmesi, yüksek fırındaki tüm parametrelerin optimizasyonunun sağlanması ile mümkündür. Pulverize kömür enjeksiyonu süresince optimize edilmesi gereken tüm faktörlerin ve proses parametrelerinin optimum bir değer aralığında olması gerekmektedir. Bu çalışmada, bir entegre demir çelik fabrikasında yakıt olarak PCI kullanımından önce ve sonra elde edilen kalite değerlerinin yüksek fırın performansına etkileri araştırılmıştır.

Anahtar Kelimeler

Pulverize kömür, Enjeksiyon, Yüksek fırın, Metalurjik kok, Yakıt

Pulverized Coal Injection (PCI) Application in Integrated Iron and Steel Factory

Öz

Pulverized coal (PC) is charged to the blast furnace along with metallurgical coke, but it cannot be used as a substitute for metallurgical coke completely. Metallurgical coke not only serves as fuel in the blast furnace, but also performs functions such as regulating the gas permeability of the furnace, ensuring uniform distribution of iron ore and flux materials in the furnace and reducing thermal stresses. Pulverized coal injection (PCI) system also has some positive and negative effects on the blast furnace. It is necessary to eliminate or minimize the negative effects and make the most of the positive effects. Using PCI with high efficiency is possible by optimizing all parameters in the blast furnace. All factors and process parameters that need to be optimized during pulverized coal injection must be within an optimum range of values. In this study, the effects of quality values obtained before and after the use of PCI as fuel in an integrated iron and steel factory on blast furnace performance were investigated.

Anahtar Kelimeler

Pulverized coal, Injection, Blast furnace, Metallurgical coke, Fuel

Kaynakça

• Ahmed, H., New trends in the application of carbon-bearing materials in blast furnace iron-making. Minerals, 8(12), 561, 2018.
• Babich, A., Application of Reducing Agents. In: Proceedings of the 4th International Vdeh-Seminar Ironmaking. Germany, Cologne, 288-302, 2017.
• Babich, A., Senk, D, Coke in the iron and steel industry. In: New Trends in Coal Conversion. Woodhead Publishing, 367-404, 2019.
• Biswas, A.K., Principles of Blast Furnace Ironmaking, Cootha Publishing House, Brisbane, Australia, 53-66, 1981.
• Chaigneau, R., Vander, T., Wise, J. Modern Blast Furnace Ironmaking: An Introduction (2009); Second Edition, Ios Press: The Netherlands, 182-186, 2009, Amsterdam.
• Du, S. W., Pulverised coal injection into blast furnace: a practical study of an integrated iron and steel works, Doctoral dissertation, University of Newcastle, 2015.
• Furtun, F., Pulverize kömür enjeksiyonunun yüksek fırın prosesine etkileri ve Kardemir 4. Yüksek fırın uygulaması, Yüksek Lisans, Karabük Üniversitesi, Fen Bilimleri Enstitüsü, 2013.
• Geerdes, M., Chaigneau, R., Kurunov, I., Modern Blast Furnace Ironmaking: An Introduction (2015); Ios Press: The Netherlands, 102-105, 2015, Amsterdam.
• İnt.Ky.1. https://tr.steelorbis.com/celik-fiyatlari/celik-istatistikleri/ (Erişim Tarihi: 03.07.2020).
• Isao, O., I. Morimasa, Tetsu-To-Hagane 90(9), 2-10, 2004.
• Ishii, K., “Advanced Pulverized Coal Injection Technology and Blast Furnace Operation”, Research Group of Pulverized Coal Combustion in Blast Furnace, Ironmaking 54th Committee, Japan Society for the Promotion of Science and Technical Division of High-Temperature Processes, 208-210, 2000, Japan.
• Ishii, J., Murai, R., Sumi, I., Yong xiang, Y., Boom, R., “Gas permeability in cohesive zone in the ironmaking blast furnace”. ISIJ international, 2017, 57(9), 1531-1536. Kakiuchi, K., S. Matsunaga, A. Sakamoto, H. Matsuoka, H. Ueno And K. Yamaguchi: Camp-ISIJ, 7, 126, 1994.
• Li, J., Biagini, E., Yang, W., Tognotti, L., Blasiak, W., “Flame Characteristics of Pulverized Torrefied-Biomass Combusted with High-Temperature Air,” Combustion and Flame, Vol. 160, No. 11, 2585–2594, 2013.
• Lundgren, M., Okvist, L. S., Hyllander, G., Jansson, B., Bjorkman, B., High temperature coke characteristics in the blast furnace: evaluation of coke properties in the raceway area. In International Conference on Process Development in Iron and Steelmaking: 10-13 June 2012, MEFOS, Vol. 2, pp. 157-168.
• Maki, A., Sakai, A., Takagaki, N., Mori, K., Ariyama, T., Sato, M. and Murai, R., High rate coal injection of 218 kg/t at Fukuyama No. 4 blast furnace, ISIJ International, vol. 36, 650-657, 1996.
• Peacey, J. G., Davenport, W. G., The iron blast furnace: theory and practice. Elsevier, 114-118, 2016.
• Peters, K. H., Peters, M., Korthas, B., Mulheims, K., Kreibich, K., Limits of Coal Injection. In IISC. The Sixth International Iron and Steel Congress, Vol. 2, Pp. 492-499, October 1990.
• Poos, A., Ponghis, N., Potentials and Problems of High Coal İnjection Rates. In Ironmaking Conference Proceedings, Vol. 49, Pp. 443-453, Mart 1990.
• Schoppa, R. K., Contours of Revolutionary Change in a Chinese County, 1900-1950. The Journal of Asian Studies, 770-796, 1992.
• Suzuki, T., L.D. Smoot, T.H. Fletcher, P.J. Smith, Combustion Science and Technology,88-92, 1986.
• Wozek, J., Zuke, A., “An Integrated Approach To Coal Quality And Its Impact On Primary Operations At Inland Steel Company,” In Ironmaking Conference Proceedings., Vol. 49, 1990, pp.235–242.
• Wunning, J. A., Wunning J. G., “Flameless Oxidation to Reduce Thermal No-Formation,” Progress in Energy and Combustion Science, Vol. 23, Pp. 81–94, 1997.
• Yan, B. H., Cao, C. X., Cheng, Y., Jin, Y and Cheng, Y., Experimental investigation on coal devolatilization at high temperatures with different heating rates, Fuel, vol. 117, 1215-22, 2014.
• Yeh, C. P. Du, S. W., Tsai, C. H. and Yang, R. J., Numerical analysis of flow and combustion behavior in tuyere and raceway of blast furnace Fueled with pulverized coal and recycled top gas”, Energy, vol. 42, p. 233-240, 2012.
• Yongning, F., Blast Furnace Coke, pp.56-58, 1995.
• Yakeya, M., Kasai, A., Tadai, R. Nozawa, K. “Gas Permeability Improvement Mechanism at the Blast Furnace Cohesive Zone by Mixed Coke Charging in Ore Layer and Effect of Coke Mixing for Different Cohesive Zone Condition on Gas Permeability”. ISIJ International, 60(7), 1438-1444, 2020.