Numerical Study Using Discrete Element Method about Coke Particle Behavior in Cohesive Zone

Abstract

The simulation of cohesive zone in the blast furnaces is conducted using 2-dimensional discrete element method. The simulation is divided into two parts; (1) the group simulation of the flow of coke and ore particles in the cohesive zone when the reduced ore particles start to shrink and disappear with melting, and (2) the biaxial compression test simulations of breakable single coke particle with receiving x and y directional stresses which is evaluated from the group simulation. In addition, a gasification model is developed and combined with the coke model for the biaxial compression test simulation. The gasification process is simulated by removing element particles for a fixed amount.In the group simulation, coke particles have been found to move actively not only the axial (horizontal) direction but also the radial (vertical) direction due to the elimination of ore particles in the melting zone. Due to these movements, the coke layers are severely distorted and the coke layer thickness is much decreased. The developed stresses on particles in the group simulation are recorded and this stress information is applied to a non-gasified and the gasified coke model to simulate the coke breakage behaviors. In the non-gasified case, both of the volume breakage and the surface abrasion are not observed. In the gasified case, the surface abrasion and fragmentation occur, but the volume breakage is not observed under the present simulation condition.

A review of high-temperature experimental techniques used to investigate the cohesive zone of the ironmaking blast furnace

“…The advantage of the numerical modelling approaches, such as computational fluid dynamics (CFD) and DEM-based models, is that they offer the capability of examining the macro-characteristics of gas flow, heat transfer and so on (CFD), as well as the generation particle-scale information (DEM) [20,114,115,[121][122][123][124][125][126][127][128]. While a detailed description of these approaches is outside the scope of this review, it is important to understand the importance of these modelling developments, especially in interpreting experimental laboratory results with respect to materials in usein this case, use within the BF.…”

High-speed Video Recording of Particle Trajectory via Rotating Chute of Nagoya No.3 Blast Furnace and its Comparison with Simulated Behavior Using DEM

“…DEM is the one of the most famous and reliable simulation methods for analyzing the solid particle behavior, and many researches using DEM has been already reported. [9][10][11][12][13][14][15][16] The particle behavior is basically very complicated, thus the validation of simulated results is the most important issue in DEM work.…”