Instantaneous thermal simulation for blast furnace with pulverized coal injection

Abstract

In order to control the inner status of blast furnace (BF) and save energy costs, improving operation parameters in time with the help of numerical simulation method is necessary. Based on the computational fluid dynamics (CFD) technology, the instantaneous modeling and simulation of multiphase flow in an iron-making BF with pulverized coal injection (PCI) was developed. Including the gas, solid, liquid and powder, four phases were considered with different materials properties in BF. Through computational visualization, the mathematical model simulated transient results of temperature distribution, which make it easier to estimate the profile and position of cohesive zone. The mathematical model considered the simple chemical reactions and coupled relationships of phases. The calculated results show that the multiphase flow varies clearly with time and position from the time of BF being ignited. The coal injection is one important factor for the formation of cohesive zone. The ore particles would be melting slowly form the cohesive zone. After about 15 hours, the cohesive zone showed a steady shape of with the PCI rate: 129 kg/thm (ton hot metal) in the 1750m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> BF. Then the performance of transient model was verified through simulating the BF process.