关键词: 铁矿石, 烧结, 数值模拟, 生物质, 竹炭, 板栗壳炭

Abstract: The heat transfer calculation model on the sintering process of iron ore with partially substituted biomass was established, the temperature fields of sintering under 7 sintering schemes were simulated with Fluent software, which were conventional sintering, and substituting conventional fuels by 10%, 20% and 30% bamboo char and chestnut shell char. Based on the calculated results, the reliability of this model was verified by the experimental data obtained by conducting 10% substituting scheme in the factory. And the model was evaluated from the perspectives of the highest temperature and cooling rate of material layer. The results indicated that the solid depth of 20% substituting schemes of bamboo char and chestnut shell char under the solid highest temperature of over 1573 K was 0.47 and 0.49 m, respectively. The solid depth under 20% substituting schemes was more than that of the conventional scheme, 10% and 30% substituting scheme, leading to the increase of the blocking amount of consolidation. The solid depth under 30% substituting schemes of bamboo char and chestnut shell char at the cooling rate of below 120 K/min was 0.458 and 0.480 m, respectively, which was more than that of the conventional scheme, and 10% and 20% substituting scheme, and the mechanical strength of sintering ore could be effectively improved. The bio-chars with much higher ignition point were beneficial to maintaining the highest temperature of material layer, while bio-chars with much lower ignition point were beneficial to improving sintering speed.

Key words: iron ore, sintering, numerical simulation, biomass, bamboo charcoal, chestnut shell charcoal