Changes in heat transfer when sintering porous goethitic iron ores
Changes in heat transfer when sintering porous goethitic iron ores
复制标题
烧结多孔针铁矿铁矿石时传热的变化
DOI：
10.1179/mpm.2000.109.1.11
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
C. E. Loo
中科院分区：
文献类型：
--
作者：
C. E. Loo
自重要概念提出以来，铁矿石烧结过程中的传热尚未得到应有的考虑。烧结过程中的对流传热极其重要，因为它决定火焰锋速度，从而决定生产率和烧结质量。化学工程传热中发展的概念是作为理解决定火焰前锋速度的因素的一种手段而提出的。讨论了热和火焰锋的定义，对流、传导和辐射在传热中的作用，通过床层的气流速度对对流传热的影响，火焰锋传热的重要性以及固体和气体的热容量对对流传热的影响。熔体形成过程中可用热量的特性也被认为在烧结中很重要。通过应用这些概念来评估多孔矿石比致密矿石更容易同化的比例增加的影响。多孔矿石应优先被同化形成熔体，因为它们同化所需的能量较少。
Heat transfer during iron ore sintering has not been given due consideration since the important concepts were developed. Convective heat transfer during sintering is extremely important as it determines the flame-front speed and, consequently, productivity and sinter quality. Concepts developed in chemical engineering heat transfer are put forward as a means of understanding the factors that determine the flame-front speed. The definition of heat and flame fronts, the roles of convection, conduction and radiation in heat transfer, the effect on convective heat transfer of air flow velocity through the bed, the importance of heat transfer from the flame front and the effect of the thermal capacities of the solids and gases on convective heat transfer are discussed. The properties of the available heat during melt formation are also considered as being important in sintering. The influence of an increase in the proportion of porous ores, which are assimilated more readily than denser ores, is assessed by application of these concepts. The porous ores should be assimilated preferentially to form melt since the energy required for their assimilation is less.