Abstract:In order to explore the distribution of temperature, gas composition and fuel burnout generated by the combustion of cheaper fuel (semi-coke) with good combustion performance in the blowpipe, tuyere, and raceway of the blast furnace, a three-dimensional physical model was established based on the actual size of blast furnace and simulation was carried out. The simulation results show that the temperature in the raceway first increases to the highest temperature and then slowly decreases as the bituminous coal and semi-coke are injected separately. The highest temperatures on the center line of tuyere are 2 447 K and 2 415 K respectively. However, the temperature in the raceway continues to rise when anthracite and CDQ powder are injected separately and the highest temperatures at the exit of raceway are 2 473 K and 2 366 K respectively. The mass fraction of CO produced by bituminous coal combustion in the tuyere and raceway is higher than that of the other three fuels. The CO mass fractions of semi-coke, bituminous coal, anthracite and CDQ powder at exit of raceway are 20.82%, 26.09%, 17.51% and 15.74% respectively. The burnout of semi-coke injection (63.01%) is higher than that of anthracite and CDQ powder (58.03% and 52.40%, respectively), and lower than that of bituminous coal (73.13%). Although the composition of semi-coke is similar to that of anthracite, the combustion performance of semi-coke in the tuyere and raceway is better than that of anthracite from the perspective of temperature, gas composition, burnout generated by the combustion.
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