板栗壳炭部分替代焦粉的铁矿石烧结数值模拟

NUMERICAL SIMULATIONON PARTLY SUBSTITUTING OF COKE BREEZE WITH CHESTNUT SHELL CHAR DURING IRON ORESINTERING PROCESS

以某钢铁企业带式烧结机为原型,建立铁矿烧结过程三维非稳态数学模型,使用该模型对传统燃料及板栗壳炭部分替代传统燃料的铁矿烧结过程进行数值模拟。针对所得结果,以10%替代方案试验数据对模型进行验证,并根据所提出的烧结热工过程评价指标对各方案进行评价。结果表明:计算结果与试验数据相吻合,10%替代组、20%替代组、30%替代组烧结终点分别比常规组提前5.1%、9.0%、12.0%,CO_2排放量分别比常规组增加0.26%、0.44%、0.58%,CO排放量分别比常规组增加0.24%、0.38%、0.52%,SO_2排放量分别比常规组减少3.5%、6.5%、9.8%,20%替代组热工过程评价指标优于常规组、10%替代组和30%替代组。

The three-dimensional unsteady mathematic model of iron ore sintering process is established with the prototype of the belt sintering machine of a certain steel enterprise. Utilizing this model, numerical simulation of the sintering process of iron ore is conducted when using conventional fuels and substituting part of conventional fuels with chestnut shell char. According to the results obtained, the model is verified by 10% alternative scheme factory test data. And furthermore, each scheme is evaluated according to the evaluation indexes of sintering thermal process. Experimental results indicated that the calculation results are consistent with the test data. And compared with the results of conventional fuels, when substituting conventional fuel with 10%, 20% and 30% chestnut shell char, burning though point finishes 5.1%, 9.0%, 12.0% earlier, discharge volume of CO2 is increased by 0.26%, 0.44% and 0.58%, respectively, and discharge volume of CO is increased by 0.24%, 0.38% and 0.52%, respectively. Discharge volume of SOs is decreased by 3.5%, 6.5%, 9.8%. Furthermore, when substituting conventional fuels with 20% chestnut shell char, the evaluation indexes of sintering thermal process are superior to those of the conventional groups, 10% and 30% substituting group.