Effect of Granule Structure on the Combustion Behavior of Coke Breeze for Iron Ore Sintering

Abstract

In order to improve the coke combustion efficiency during iron ore sintering, the effect of coke granule structure was investigated with a TG-DTA and a new combination heating equipment capable of establishing similar heating pattern to the actual sintering bed. The results were analyzed as a function of granule type and neighboring specie as follows:The granule type was crucial to the combustion behavior of granules. On the other hand, the effect of neighbors was distinct over core coke particles; meanwhile, the effect remained uncertain in pellet type granules. The authors recommend composite type granules (fine coke particles adhering on a core particle) for the best choice. The type should bring 1.2% save of coke consumption and 2.3% increase in the heat front speed in comparison to coke particles of single type.

Effects of Temperature and Circulating Flue Gas Components on Combustion and NO<i>_x</i> Emissions Characteristics of Four Types Quasi-particles in Iron Ore Sintering Process

“…Close contact of hematite and limestone with coke will accelerate those reactions to lower the ignition temperature. 30,[35][36][37] Therefore the mass conversion rate of S' type quasi-particles which have no adhering layer was the lowest.…”

“…In the experiments with different temperature, the mass reduction of sample was considered to be mainly caused by the following chemical reactions. 9,30) C O CO (s) (g) (g) o where x(t) was the sample mass conversion rate (%), m 0 and m ∞ are the initial and final mass of the sample, respectively (g), and m t is the mass of the sample at time t (g).…”

Ore Assimilation and Secondary Phases by Sintering of Rich and High-Gangue Iron Ores

“…In fact, there are different suggestions in the literature regarding what particle size should be considered as the border between adhering and nuclei particles [33,34]. Nevertheless, the reactivity of the fines must also be taken into account.…”

Effect of Size Distribution of Coke Breeze on Sintering Performance

“…There are many studies that have been carried out on the property of a single particle size of fuel . But in the actual sintering process, the sizes of fuel are different which are mixed together.…”

“…There are many studies that have been carried out on the property of a single particle size of fuel. [10,11] But in the actual sintering process, the sizes of fuel are different which are mixed together. Basically the solid fuels with different size exist in sintering granular based on the following three ways [12,13] : (i) Coarse particles (þ3 mm) become the core of granular and packed by other fine particles (À1 mm).…”