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Degassing of coal particles injected into iron melts
Author(s) -
Oeters Franz,
Orsten Stefan
Publication year - 1989
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198900891
Subject(s) - endothermic process , chemistry , thermodynamics , coal , heat transfer , particle (ecology) , thermal conduction , mineralogy , analytical chemistry (journal) , chromatography , adsorption , organic chemistry , physics , oceanography , geology
A mathematical model was developed, that describes heating and degassing of coal particles blown into liquid iron. The model combines heat transfer from iron melt to particle surface and heat conduction within particle with the kinetics of the degassing process. The endothermic degassing reaction generates heat sinks within the particle. Local heat consumption per time for degassing is determined simultaneously by heat transfer and by the temperature dependent rate constant of the first order degassing reaction. Model calculations result in temperature distribution within particle, degassing rate, and overall degassing time. Overall degassing time, defined by a degassing rate of 99%, is given by t g [s] = f d p 1.5 [mm] for 0.05 ≦ d p ≦ 0.8 mm. The factor f lies between 1.02 and 1.14 for various coals. The exponent 1.5 is nearly independent of coal type. Results obtained are in good agreement with published comparable results for rapid degassing of coal particles.