Showing papers by "Nirupam Chakraborti published in 1998"
01 Jan 1998
TL;DR: In this paper, the authors presented a modeling study of preheating of blooms in a fuel fired furnace using a combined GA and heat transfer formulation using a re-heating furnace containing three asymmetrically placed burners.
Abstract: This paper presents a modeling study of preheating of blooms in a fuel fired furnace using a combined GA and heat transfer formulation A re-heating furnace containing three asymmetrically placed burners are considered in this study, which is a typical configuration used in many integrated steel plants This study shows that the GA is an ideally suited tool for studying such complex problems
4 citations
Journal Article•
TL;DR: In this article, the reduction process in detail under a packed bed configuration with gas flowing vertically through the bed was examined and a mathematical model was also developed, considering a steady state solution for fluid flow though the packed bed by Ergun's equation, and simultaneous transient solutions for the heat and mass balances of the gas and solid phases, giving rise to a quasi-steady state formulation.
Abstract: Background/purpose: Low grade nickeliferrous ore recently discovered in Sukinda, India is still not commercially exploited. Selective reduction of nickel followed by alkaline leaching is however a suggested strategy for Ni extraction from this lateritic deposit. This paper examines the reduction process in detail under a packed bed configuration with gas flowing vertically through the bed. Methods: Reduction roasting of Indian Nickeliferrous ores was performed in a laboratory scale packed bed reactor using hydrogen as the reducing agent. A mathematical model was also developed, considering a steady state solution for fluid flow though the packed bed by Ergun's equation, and simultaneous transient solutions for the heat and mass balances of the gas and solid phases, giving rise to a quasi-steady state formulation. Results: The experimental and simulated results showed a reasonably good match. Effect of some of the important parameters such as pellet size, gas velocity and composition were also studied computationally, providing further insight into the process. Conclusion: Based upon the laboratory and modeling studies undertaken during the present investigation, the packed bed selective reduction of Indian lateritic ore appears to be a feasible process. The results can be further extended for analyzing the industrial shaft furnaces where gas-solid contacting is similar to that used in the laboratory experiments.
3 citations