Gas-Particle Flow and Combustion Characteristics of Pulverized Coal Injection in Blast Furnace Raceway

The two-dimensional steady-state discrete phase model for gas-particle flow and combustion of pulverized coal injection is established and solved to analyze gas-particle flow features and combustion characteristics of coal particles, as well as components concentration and temperature distribution of coal gas by using numerical simulation technology. The results show that a great deal of gas discharge on top of raceway away from tuyere, residence time of coal particles in the region of blowpipe and tuyere is 20 ms or so, 50 ms when its reach raceway boundary. The pressure is highest at the bottom of raceway, the maximal temperature is about 2423 K, the char combustion is mainly carried out in the raceway, and the maximum of char burnout rate attains to 3×10-4 kg/s.