Physical Model of Influence of CaO–FeO–SiO2 Powder Fraction on the Heat Transfer from Torch
Keywords:basic oxygen converter processes, physical modeling of postcombustion converter exhaust gas torch, modeling the dustiness of the torch environment, visual characteristics of torch, heat transfer
Introduction. One of the main ways of heat transfer in metallurgical units is the interaction of the charge with a burning gas torch. The heat is transferred from the torch mainly by radiation. In particular, oxygen converter process under its typical temperature and chemical conditions of oxidation processes is accompanied by combustion reactions with the formation of a torch both in the cavity of the converter (in the so called reaction zone) and above the converter neck as a result of partial post-combustion of exhaust gases leaving the unit.
Problem Statement. The processes in metallurgical units are accompanied by significant smoke and dust, which affect the efficiency of heat transfer from the torch of exhaust gases post-combustion to the metal bath that is an additional source of heat in the converter process.
Purpose. The purpose of this research is to study the influence of the introduction of solid powder components into the environment around the torch on its heat transfer.
Materials and Methods. The research has been carried out on the physical model of a burning torch when CaO-FeO-SiO2 system powders are fed into the torch in air flow. The magnitude of the heat flow density has been estimated on the basis of the registered temperature difference in different parts of the model.
Results. It has been established that the feed of air or any solid material at a temperature much lower than the torch temperature has a negative effect on heat transfer from the torch by radiation. However, the total heat flow density is not significantly reduced due to the possible involvement of heated solids in other heat transfer methods. For the CaO-FeO-SiO2 system, the share of silicon dioxide powder as a component with the highest heat capacity has the greatest negative effect on the heat transfer from the torch.
Conclusions. The studies based on the physical model have allowed us to qualitatively assess the effect of dustiness of the components of CaO-FeO-SiO2 system of the burning torch environment on its heat transfer and on the contribution of different heat transfer methods from the torch to the total heat flow density in given conditions.
Bigeev, А. M. (1988). Steel metallurgy. Theory and technology of steel melting. Cheliabinsk: Metallurgy [in Russian].
Baptizmanskiy, V. I. (1975). Theory of the oxygen-converter process. Moscow: Metallurgy [in Russian].
Makarov, А. N. (2014). Heat transfer in electric arc and flare furnaces and power plants: a textbook for universities. Sankt Petersburg: Lan’ [in Russian].
Kutaladze, S. S. (1990). Heat transfer and hydraulic resistance: a reference book. Moscow: Ekonomizdat [in Russian].
Bloh, А. G. (1967). Heat radiation in boiler plants. Lviv: Energiya [in Russian].
Bloh , А. G., Zhuravlev, Yu. A., Ryzhkov, L. N. (1991). Heat transfer by radiation: a handbook. Мoscow: Energoatomizdat [in Russian].
Маkarov, А. N., Svenchanskiy, A. D. (1992). Optimal thermal conditions of steel arc furnaces. Мoscow: Energoatomizdat [in Russian].
Маkаrov, А. N. (1998). Heat transfer in electric arc furnaces. Тver: Tver State Technical University [in Russian].
Telegin, A. S. (1993). Heat engineering calculations of metallurgical furnaces: textbook Moscow: Metallurgiya [in Russian].
Кrivdin, V. А., Yegorov, A. V. (1989). Thermal work and constructions of ferrous metallurgy furnaces. Moscow: Metallurgy [in Russian].
Аmetistov, Ye. V. (2000). Fundamentals of the theory of heat transfer: textbook. Мoscow: publishing house of the Moscow Energy Institute [in Russian].
Nevskiy, А. S. (1971). Radiant heat transfer in furnaces and fireplaces. Moscow: Metallurgy [in Russian].
Tymchak, V. M., Gusovskiy, V. L. (1983). Calculation of heating and thermal furnaces. handbook [in Russian].
Husovskiy, V. L., Lifshits, A. Ye. (2004). Methods for calculating heating and thermal furnaces. Moscow: Teplotekhnik [in Russian].
Rumiantsev, V. D. (2006). Heat and mass transfer theory. Dniepropetrovsk: Porogi [in Russian].
Babichev, A. P., Babushkina, N. A., Bratkovskiy, A. M. (1991). Physical quantities. Handbook. Moscow: Energoatomizdat [in Russian].
Chuvanov, О. P., Boychenko, B. M. (2004). Environmental protection and recycling of materials in steel production: a textbook. Dnipropetrovsk: NМеtАU [in Russian].
Zhulkovskiy, О. А., Мasterovenko, Ye. L. (1998). On the features of heat transfer in the gas phase of the oxygen converter. Industrial heat engineering, 20(1), 15–18 [in Russian].