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Based on the principles of mass, momentum and heat transfers between the reducing gas and the iron ore solid, a two-dimensional
mathematical model for above two phases is established to study the influences of reducing gas composition on thermal and
reduction conditions in pre-reduction shaft furnace with the temperature ranging from 1 023 to 1 223K. Due to the strong endothermic
effect of iron ore reduction participated by hydrogen (H2), increasing the ratio of carbon monoxide (CO) to H2 enlarges high temperature zone under present calculation conditions, thus improves reduction efficiency inside the furnace.
In addition, replacing of the reducing gas with an appropriate proportion of nitrogen (N2) featuring the same temperature has a potential to reduce fuel consumption by as much as 6.5% while the products of similar
quality are yielded. 相似文献
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基于均匀法的风雨载荷下折叠式舱口盖拓扑优化设计研究 总被引:1,自引:0,他引:1
本文以48500DWT散货船舱口盖为研究对象,提出改变传统折叠式舱口盖设计方法,引入拓扑优化的方法对舱口盖横梁腹板、纵桁腹板进行优化设计。通过ANSYS模拟仿真分析,找出最佳力传递路径的结构布置形式,根据优化结果提取节点信息,经过对拓扑优化后的模型进行二次优化,完善了拓扑优化的结果,使其材料布局形式更合理,研究结果表明,基于均匀法的拓扑优化方法运用于折叠式舱口盖的设计中,可改善舱口盖横梁腹板、纵桁腹板结构,保证其强度并且达到轻量化设计的目的,为舱口盖横梁腹板、纵桁腹板的结构设计提供参考依据。 相似文献
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随着汽车行业的快速发展,顾客不仅对汽车性能有所要求,对汽车的感官质量,尤其是门盖尺寸匹配方面的要求也正在逐步提高。汽车四门两盖匹配状态的好坏,将直接影响到客户对车辆的第一感知和对车辆的认可度、满意度。文章运用PFMEA过程分析方法,对某车型尾门与侧围面差匹配差这种潜在的失效模式进行了分析,通过引用新技术、新工艺,增加限位,缩小尺寸链等方法,提高探测率,降低了尾门与侧围面差大的失效频次,使得尾门与侧围面差匹配问题得到有效控制,产品质量得到了很好的保障。 相似文献