Transactions of the Indian Institute of Metals ( IF 1.6 ) Pub Date : 2021-02-04 , DOI: 10.1007/s12666-020-02162-w Veera Brahmacharyulu Angalakuditi , Sudhakar Karre , Lokendra Raj Singh , Saroj Sundar Baral
Recycling waste gas through the sinter bed has an advantage of saving solid fuel. Depending upon the amount of waste gas recycled and its CO content, an equivalent quantity of solid fuel is saved. FeO is one of the key indicators of fuel needed for sintering; its optimization is critical to the consistency in sinter quality. Sinter pot tests were conducted to identify the effect of varying amounts of waste gas recycled. FeO and Tumbler Index increased with increasing waste gas up to 30%. Beyond 40% waste gas recycled, Tumbler Index decreased and the disintegration of the sinter was noticed. Incidental variation in the rate of solid fuel in an industrial scale Sinter Plant with waste gas recycling arrangement has resulted in a large variation in FeO than expected. Above 20%, productivity got adversely affected and Tumbler Index dropped as oxygen in the recycled gas started dropping below 19%. The rate-limiting mechanism has been identified as the underlying reason for low FeO. The deficiency of oxygen has affected the combustion efficiency of solid fuel, and hence, fresh airflow has been optimized to maintain the productivity and quality parameters. The variation in the carbon rate was restricted to 0.77 ± 0.5 kg/t, and oxygen was maintained above 19% to achieve consistent performance.
中文翻译:
废气回收铁矿石烧结过程中的限速机理
通过烧结床再循环废气具有节省固体燃料的优点。根据再循环的废气量及其一氧化碳含量,可以节省等量的固体燃料。FeO是烧结所需燃料的关键指标之一;其优化对保持烧结矿质量至关重要。进行了烧结锅测试,以确定不同数量的再循环废气的影响。FeO和不倒翁指数随着废气的增加而增加,最高可达30%。超过40%的废气再循环后,不倒翁指数下降,并注意到烧结矿的崩解。在具有废气再循环装置的工业规模烧结厂中,固体燃料速率的偶然变化导致FeO的变化比预期的大。20%以上 生产率受到不利影响,并且随着再循环气体中的氧气开始降至19%以下,Tumbler指数下降。限速机制已被确定为低FeO的根本原因。氧气的缺乏影响了固体燃料的燃烧效率,因此,新鲜气流已得到优化,以保持生产率和质量参数。碳速率的变化限制在0.77±0.5 kg / t,氧气保持在19%以上以实现稳定的性能。