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首页> 外文期刊>ISIJ international >Prediction of Pre-reduction Shaft Furnace with Top Gas Recycling Technology Aiming to Cut Down CO2 Emission
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Prediction of Pre-reduction Shaft Furnace with Top Gas Recycling Technology Aiming to Cut Down CO2 Emission

机译：旨在减少CO 2 排放的顶部气体再循环技术对预还原竖炉的预测

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摘要

Top gas recycling is considered as one of the highest potential technologies to improve reduction efficiency and correspondingly to reduce carbon consumption. As a typical nitrogen free ironmaking process, pre-reduction shaft furnace of COREX~(?) process (COREX~(?) shaft furnace) for short is suitable to adopt the technology aiming to cut down CO_(2) emission. Under the premise of constant total injection volume, three kinds of reducing gas injection methods are numerically studied by employing a two-dimensional mathematical model. The method that 20% of total reducing gas in volume fraction is blasted through normal inlet (NI) while the rest through down pipe inlet (PI) rather than deadman inlet (DI) could apparently improve gas flow in the inactive zone located near the bottom direct reduced iron (DRI) outlet, thus increasing DRI reduction degree to 61% under present calculation conditions. Meanwhile, either decreasing the vertical height of PI or increasing its diameter makes further improvement on furnace efficiency. After adopting top gas recycling to the shaft furnace by NI+PI method with optimal parameters, CO utilization ratio reaches above 46% when DRI reduction degree correspondingly increases by 12%, what's more, CO_(2) emission from the whole process is reduced by about 540 Nm~(3)/tHM. The results prove that top gas recycling technology promotes reduction efficiency inside shaft furnace and greatly reduces the greenhouse gas emission, which will contribute to suppressing global warming.
机译：顶部气体再循环被认为是提高减排效率并相应减少碳消耗的最有潜力的技术之一。作为一种典型的无氮炼铁工艺，COREX〜（？）工艺的预还原竖炉（COREX〜（？）竖炉）适合采用旨在减少CO_（2）排放的技术。在总喷射量恒定的前提下，采用二维数学模型对三种还原气喷射方法进行了数值研究。体积分数占总还原性气体20％的方法是通过正常入口（NI）进行鼓风，而其余部分通过下管入口（PI）而不是无人值守入口（DI）进行鼓风，这显然可以改善位于底部附近的非活动区域的气流直接还原铁（DRI）出口，因此在当前计算条件下将DRI还原度提高到61％。同时，减小PI的垂直高度或增大其直径可以进一步提高炉效率。在采用最优参数的NI + PI方法将竖炉顶部气体再循环至竖炉后，当DRI还原度相应提高12％时，CO利用率达到46％以上，而且整个过程的CO_（2）排放降低了约540 Nm〜（3）/ tHM。结果证明，顶级气体再循环技术可提高竖炉内部的还原效率，并大大减少温室气体的排放，这将有助于抑制全球变暖。

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