Abstract
The objective of this paper was to develop a prediction tool for the burden distribution in a charging process of a bell-less-type blast furnace using the discrete element method (DEM). The particle behavior on the rotating chute and on the burden surface was modeled, and the burden distribution was analyzed. Furthermore, the measurements of the burden distribution in a 1/3-scale experimental blast furnace were performed to validate the simulated results. Particle size segregation occurred during conveying to the experimental blast furnace. The smaller particles were initially discharged followed by the larger ones later. This result was used as an input in the simulation. The burden profile simulated using DEM was similar to the experimental one. The terrace was found at the burden surface subsequent to ore-charging, and its simulated position simulated agreed with that of the experimental result. The surface angle of the ore layer was mostly similar. The simulated ore to coke mass ratio (O/C) distribution in the radial direction and the mean particle diameter distribution correlated with the experimental results very well. It can be concluded that this method of particle simulation of the bell-less charging process is highly reliable in the prediction of the burden distribution in a blast furnace.
Highlights
A blast furnace is a reactor with approximately 5000 m3 of volume to produce pig iron from ore particles
The mean particle diameter of the radial direction were compared with the experimental results, which were obtained in the 1/3-scale radial direction weredistribution compared with the experimental results, which were obtained experimental burden simulator
The following is a summary of this study:in the 1/3-scale experimental burden distribution simulator
Summary
A blast furnace is a reactor with approximately 5000 m3 of volume to produce pig iron from ore particles. Iron ore particles are reduced during the descent, and numerous physical changes and chemical reactions occur between each phase over this period It is an extremely complicated system, resulting in the possibility of unfavorable phenomena or serious problems occurring. To avoid these problems, controlling and stabilizing the gas flow in the furnace is of utmost importance because the gas plays a key role for the reduction and the heat source. Controlling a void fraction in the stacked layer, i.e., the burden distribution at the top of the blast furnace, is the most effective operation for stabilizing the gas flow. Many kinds of particles are usually mixed in ore charging to help the reduction; it is necessary to analyze the individual
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