Modelling of pulverized coal injection combustion process in the validation test rig using the Euler-Lagrangian approach

Abstract

The combustion of pulverized coal is widely used in ironmaking blast furnaces. The pulverized coal has become a very important fuel. Most of the combustion models for the domain zone blast furnaces are based on CFD-LPT approach. In the Eulerian-Lagrangian approach, the continuous phase is treated as a continuum by solving the Navier-Stokes equations and the conservation equations for mass momentum and heat; the dispersed phase is calculated by tracking a large number of particles that follow Newton second law. The coalChemistryFoam solver was used to calculate the flow parameters in the test blast furnace combustion chamber (validation test rig). A system of equations based on the URANS model and the k-ε model of turbulence was used. The gmsh utility was used to build the computational grid. The temperature, velocity fields for gas and solid particles, concentrations fields of gas in particles and ash in particles have been calculated for given flow rate of coal particles in the valid test rig. The calculations were run on a computing cluster of the web-laboratory of UNICFD ISP RAS. Each calculation was performed on 48-64 cpu cores.