Influence of lance design and operating variables on post combustion in the converter with secondary flow nozzles.

概要

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In order to understand the optimal condition of the design and operation of the lance equipped with secondary nozzles as well as main ones, the behavior of the inclined oxygen jet was theoretically analyzed and the post combustion ratio was calculated after combining the previous experimental data with the theoretical jet model.Equations of continuity, conservations for momentum, enthalpy and gas species inside the jet were derived from quasi one dimensional assumption. The numerical calculation of the inclined jet by using Runge-Kutta method enables us to describe the jet trajectory, the distributions of velocity, temperature and mass fractions. Under the assumption that CO2 or O2 in the impinging jet reacts with C at the interface, under the rate-determing step of gas diffusion, the relation between the reaction rate and the theoretically calculated physical quantities is obtained statistically from the data in the real converters.The calculation of this model shows that the optimal secondary oxygen flowrate is determined by the factors such as the lance height, nozzle diameter, nozzle angle, etc. in order to obtain the maximum post combustion ratio.
The Iron and Steel Institute of Japanの論文