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Effect of Oxygen Enrichment on Top Layer Sinter Properties

机译：氧富集对顶层烧结性能的影响

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Properties like shatter index and yield of the top layer of iron ore sinter in a Dwight-Uoyd sintering machine have always been a bottleneck for improvement of overall sinter quality due to the practical limitation of achieving high sintering temperature and dwell time in the top layer. To improve the sinter yield and shatter index of top layer, various technologies like usage of additional coke breeze, gaseous fuel injection and oxygen enrichment have been reported. In this paper, effect of oxygen enrichment of the incoming air on top part of the sinter bed was investigated using pot sinter experiments with varying oxygen percentage of 0 to 12 vol.% in the incoming air for an initial duration of 1/3rd of the total sintering time. It was observed that with increasing oxygen percentage from 0 to 9 vol.% in the incoming air, top layer sinter yield increased from 76.1 to 80.6% and shatter index from 69.0 to 74.8%. The improvement in sintering properties were mainly attributed to the promotion of sintering reaction with improved time-temperature profiles specifically at the top layer which results in increase of phase fraction of Silico ferrites of calcium and aluminum (SFCA-I). However, beyond 9 vol.% oxygen enrichment, change in sinter properties was not significant. It is considered that excessive increase of oxygen enrichment does not contribute much to the increase of top layer peak temperature.
机译：DWIGHT-UOYD烧结机中的碎片指数和顶层铁矿石烧结板的产量始终是由于在顶层实现高烧结温度和停留时间的实际限制而改善整体烧结质量的瓶颈。为了提高顶层的烧结产量和破碎指数，已经报道了各种技术，如额外的焦炭微风，气体燃料喷射和富氧富氧。在本文中，使用锅炉实验研究了烧结床顶部在烧结床顶部的氧气富集的影响，其氧含量为0至12体积的0〜12体积。收入空气中的初始持续时间为1/3总烧结时间。观察到，随着0至9体积的氧百分比，在进入空气中的百分比，顶层烧结产量从76.1增加到80.6％，碎片指数从69.0到74.8％增加到74.8％。烧结性能的改善主要归因于促进烧结反应，其特异性地在顶层处具有改进的时间 - 温度曲线，这导致钙和铝的硅铁硅氧石的相位倍数增加（SFCA-1）。然而，超过9体积的氧气富集，烧结性能的变化不显着。认为氧富集的过度增加不会导致顶层峰值温度的增加。

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