"There have been a lot of technical advances in electric arc furnace (EAF) steelmaking over the last 30 years, but there is still a significant amount of energy that might be recovered and utilized within the EAF to improve the productivity and reduce the carbon monoxide content of the offgas.
About 20% of the energy in a typical EAF is lost as sensible heat or unutilized chemical energy in the offgas. This energy is the target of post-combustion studies. Post combustion is the injection of secondary oxygen into steelmaking vessels in order to convert the generated CO to CO2. This reaction being highly exothermic results in large quantities of energy which can be utilized within the furnace. The purpose of this research was to develop a better understanding of the post-combustion process and evaluate the effects of heat transfer and fluid flow phenomena that take place in the EAF.
Thermodynamic models (Global and Pseudo-Dynamic) were developed using the Pyrosim software. The global model considered all the inputs into the furnace and based on those inputs predicted the outputs from the furnace. The EAF was modeled as a single reactor with four zones: a melting zone; a foamy slag zone; a post combustion zone and a duct zone. The dynamic model was divided into various stages and the composition of metal and slag was calculated at different times during the heat. EAF steelmaking was modeled as a series of steps. It was concluded that oxygen for PC may be more effective if added at a higher rate during earlier parts of the heat.
The Pyrosim model considers the thermodynamic equilibrium and a mass and heat balance but does not consider the effects of fluid flow and heat transfer. Hence a numerical model was developed using FLUENT, a computational fluid dynamics software. The purpose of this model was to analyze post combustion by the computation of flow patterns, concentrations and temperature fields in the gas space of an electric arc furnace. The effect of variables such as the number of lances, angle and velocity at which the oxygen is injected was also studied"--Abstract, page iii.
Peaslee, Kent D., 1956-2013
Robertson, D. G. C.
Materials Science and Engineering
M.S. in Metallurgical Engineering
University of Missouri--Rolla
x, 76 pages
© 2000 Divyang Shah, All rights reserved.
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Shah, Divyang, "Modeling of post combustion in the electric arc furnace" (2000). Masters Theses. 1913.
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