7639

7111

كارشناسي ارشد

تبديل انرژي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1391

نه،112ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

محسن دوازده امامي، مسعود پنجه پور

24/1/92

احمد صابونچي،احمد صداقت

مهندسي مكانيك

ID7111

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Simulation of Sintering Process by Considering Extended Chemical Mechanisms Masoud Pahlevaninezhad m pahlevaninezhad@me iut ac ir Date of Submission 2013 01 15 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisors M D Emami mohsen@cc iut ac irM Panjepour panjepour@cc iut ac irAbstractIron making and its alloys especially steel has attracted attentions ever due to its widely applications Theproduction processes related to iron making have been subject of many researchers Blast furnace is themain method of steel making in the world Sintering is considered as an important and key process for theproduction of pig iron based on the blast furnace technology Sinter forms between 50 to 70 percent of theblast furnace iron load In this study the iron ore sintering process was simulated with an unsteady twodimensional axisymmetric model by considering extended chemical mechanisms Chemical mechanismsconsist of coke oxidation and gasification limestone decomposition iron ore reduction and oxidation evaporation and condensation of water melting and solidification of iron ore and homogeneousmechanisms in the gas phase The present simulation was performed with a pressure based finite volumeapproach computer code Simulation results for a sintering pot indicate that considering extended chemicalmechanisms improves simulation predictions Based on the simulation results sintering bed was dividedinto five zones with respect to the temperature and gaseous species variations along the axial direction ofthe bed Effects of chemical reactions kinetic parameters coke particles size inlet air velocity coke amountin the sintering charge and limestone particles size on product sinter quality and time of sintering processwas studied Effect of the kinetic parameters on flame front is complex Some of these parameters cause theflame front temperature increase at some areas while in other areas the flame front temperatures decrease Larger coke particles size reduces the product sinter quality and increases the sintering time If limestoneparticles size decreases too much the amount of the decomposed limestone in the bed reduces and theproduct sinter quality declines An increase in the inlet air velocity reduces the sintering time considerably Amount of coke in the sintering charge might not change the sintering time sensibly but affects the productsinter quality and coke consumption considerably Finally anthracite substitution for coke as fuel in the bedwas studied Coke replacement with anthracite may decrease product sinter quality considerably However reduction of anthracite particles size could increase the sinter quality Keywords Chemical mechanism Simulation Iron ore sintering Kinetic parameters Solidcombustion

محسن دوازده امامي، مسعود پنجه پور

احمد صابونچي،احمد صداقت