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首页> 外文期刊>ISIJ international >Effect of Drying Treatment after Granulating Sinter Raw Materials on Flame Front Speed and Sintering Yield
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Effect of Drying Treatment after Granulating Sinter Raw Materials on Flame Front Speed and Sintering Yield

机译：烧结原料造粒后的干燥处理对火焰前移速度和烧结产率的影响

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摘要

For increase of sinter productivity, it is important to design sinter mixture granulation.Moisture is indispensable for granulation as a binder between raw material particles. Once granulation is completed, moisture is dispensable during sintering because moisture vaporization is endothermic reaction.Based on the above-mentioned view, a process of drying the granules after granulation with high moisture examined for sintering productivity by use of sinter pot test.The main results obtained are described as follows:(1)?Drying in conjunction with high moisture granulation is effective to increase flame front speed with maintaining sintering yield;(2)?Increasing flame front speed is due to shorten the time to evaporate moisture in the wet zone of sintering packed bed in addition to increasing permeability of sintering packed bed. This effect is also evaluated and proved based on calculation of moisture transition in and out of sintering packed bed;(3)?Maintaining sintering yield is due to higher heat generation in sintering packed bed caused by higher coke combustion efficiency in addition to lower moisture concentration of sinter mixture.(4)?Collapse of granules in case of drying after granulation is avoided till the critical moisture, that is defined as the one left in the mix after higher moisture granulation makes granules to keep shape easy due to higher moisture quantity on the surface of granules.
机译：为了提高烧结矿的生产率，设计烧结混合物造粒非常重要。水分是造粒必不可少的原料颗粒之间的粘合剂。造粒完成后，由于水分蒸发是吸热反应，因此在烧结过程中不需要水分。基于以上观点，通过烧结锅试验检查了高水分造粒后的颗粒干燥过程的烧结生产率。获得的结果如下：（1）？与高水分造粒一起干燥可有效提高火焰前沿速度并保持烧结产量;（2）？提高火焰前沿速度是由于缩短了湿区中水分蒸发的时间除了增加烧结填充床的渗透性外，还需要增加烧结填充床的渗透率。此效果也根据计算出的填料填充床内外的水分转变进行了评估和证明;（3）保持烧结产量的原因是，除较低的水分含量外，较高的焦炭燃烧效率还导致烧结填料床中产生较高的热量。 （4）避免制粒后干燥情况下颗粒的崩解，直到临界水分为止，该临界水分被定义为较高水分制粒后由于较高的水分含量而使颗粒易于保持形状的混合物中剩下的那一种。颗粒的表面。

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