Abstract Oxygen enrichment is believed to improve productivity and reduce fuel consumption, while gas fuel injection is assumed to improve the product yield and quality in iron ore sintering process. It is important to understand the mutual effect of oxygen enrichment and gas fuel injection for combined usage of these two techniques. A mathematical model is developed to simulate the sintering process with coke oven gas (COG) injection and oxygen enrichment, particularly focusing on predicting the quality and yield of sinter production, as well as NO x emission. The model is validated by comparing the model predictions with sintering pot test data, and numerical simulations are carried out to investigate the mutual effect of oxygen enrichment and COG injection. The results show that, compared with the conventional sintering process, with 0.5% COG injection and 30% oxygen enrichment, the mean melt quantity index (MQI) is increased by 4.1% and the mean cooling rate (CR) is decreased by 62.5%, showing that the sinter quality is improved significantly. The sinter yield is increased by 44.5%, whereas the NO x emission is increased by 8.3%. With the increase of oxygen enrichment from 21% to 30%, the sinter yield increases prominently first and then decreases a little, attaining its maximum at 30% of oxygen concentration. In addition, increasing oxygen concentration will increase the conversion rate of coke-N to NO x . Therefore, excessive oxygen enrichment is not only bad for sinter strength and yield, but also increases NO x emission.

中文翻译：

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焦炉注气富氧铁矿石烧结过程数值模拟

摘要 富氧被认为可以提高生产率并降低燃料消耗，而气体燃料喷射被认为可以提高铁矿石烧结过程中的产品收率和质量。对于这两种技术的组合使用，了解富氧和气体燃料喷射的相互影响非常重要。开发了一个数学模型来模拟焦炉煤气 (COG) 喷射和富氧的烧结过程，特别侧重于预测烧结矿生产的质量和产量，以及 NO x 排放。通过将模型预测与烧结罐试验数据进行比较来验证模型，并进行数值模拟以研究富氧和COG注入的相互影响。结果表明，与常规烧结工艺相比，COG注入0.5%，富氧30%，平均熔体量指数（MQI）提高4.1%，平均冷却速率（CR）降低62.5%，表明烧结矿质量得到显着改善。烧结矿产量提高了 44.5%，而 NOx 排放量提高了 8.3%。随着富氧量从21%增加到30%，烧结矿产率先显着增加后略有下降，在氧浓度30%时达到最大值。此外，增加氧气浓度会增加焦炭-N向NO x 的转化率。因此，过度富氧不仅对烧结矿强度和产量不利，