铁矿石低碳烧结的数值模拟

建立了烧结过程传热模型，利用Fluent软件对常规烧结及以10%, 20%, 30%(等能量输出)竹炭和板栗壳炭替代常规燃料进行烧结的温度场进行数值求解，计算值与测定值对比验证模型的可靠性，以料层最高温度和料层冷却速率对各方案进行评价. 结果表明，竹炭和板栗壳炭20%替代方案最高温度高于1573 K时的料层厚度分别为0.49和0.47 m，大于常规烧结及10%和30%替代方案，能有效提高烧结矿成块固结量；竹炭和板栗壳炭30%替代方案料层冷却速率小于120 K/min时的料层厚度分别为0.458和0.480 m，大于常规烧结及10%和20%替代方案，有助于提高烧结矿机械强度；用燃点较高的生物质炭替代常规燃料有利于提高料层最高温度，用燃点较低的生物质炭替代常规燃料有利于加快烧结速率.

Numerical Simulation on Sintering of Low-carbon Iron Ore

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.