Analysis on the Oversize Blast Furnace Desulfurization and a Sulfide Capacity Prediction Model Based on Congregated Elec
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TRODUCTION
THE thermodynamic models or the calculation program are mostly based on the principles of infinite long reaction time or the minimization of Gibbs free energy of the system under equilibrium condition. Strictly speaking, it is not accurate to apply them into the actual plant production, for BF smelting process is a continuous production course which is always on the way to the equilibrium state.[1] However, based on the well thermodynamic environment and dynamic condition in BF, some researcher[2] proposed ‘‘plant vs equilibrium’’ concepts to describe the sulfur distribution reaction between hot metal and slag, meaning that the final sulfur content in slag and hot metal are very close to the ideals (thermodynamic equilibrium values) and it is possible to utilize the model to the actual production by introducing correction coefficient. Because of the little basic research on the combination of thermodynamic models and actual production, the present study collected daily average data in 2014 all year round at the condition of stable production from an oversize BF WANG ZHENYANG, Ph.D. Candidate, ZHANG JIANLIANG, Professor, LIU ZHENGJIAN, Lecturer, and ZHANG JINGWEI, Master Candidate, are with the School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Metallurgy Building, 517 Room, 30 Xueyuan Road, Haidian District, Beijing 100083, China. Contact e-mail: [email protected] AN GANG, CHENG ZHENGMING, and HUANG JUNJIE, Engineers, are with the Ironmaking Plant, Shougang Jingtang United Iron & Steel Co. Ltd, 063200 Caofeidian, China. Manuscript submitted June 14, 2015. Article published online September 22, 2015. METALLURGICAL AND MATERIALS TRANSACTIONS B
(5500 m3) in north China, and analyzed the relationship between the desulfurization parameters and the slag composition at the equilibrium state or the ‘‘final reaction state’’ in actual production situation. Furthermore, through compared with the actual measured sulfur capacity and introduced correction factors, a new improved thermodynamic model CEPM was obtained, which is beneficial to provide a more accurate and quick prediction sulfide capacity method for the factory production. II. THE ANALYSIS ON THE OVERSIZE BF OPERATING PARAMETERS ABOUT DESULFURIZATION A. The Average and Change Range of the Study Data The research data were obtained from 1# BF of an ironmaking plant in north China. Except the special period, such as blast damping down and acidic slag removing alkali, the data of one year round (2014) were processed and analyzed after averaging one day as a unit. Therefore, a total number of 347 days‘ dates, including actual operation parameters and chemical component, are shown in Tables I and II, which could be taken as a condition of plant vs equilibrium. B. Influence Rules of Sulfur Distribution Ratio in Actual Production The total sulfur content in slag and hot metal greatly depends on the slag basicity and hot metal temperature.[3] Thus, after classifying the actual production sulfur distribution ratio ba
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