共查询到19条相似文献,搜索用时 93 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
9.
回转窑结圈一直以来是制约煤基回转窑直接还原工艺发展的重要因素,以某低品位铁矿回转窑还原结圈物为研究对象,深入研究回转窑结圈物的特性及其形成机制.从结圈物的宏观形貌、物化性能、软熔特性和微观结构入手对某低品位铁矿球团回转窑结圈物的特性进行分析,并结合热力学相图、化学物相及能谱分析研究了结圈物的形成机制.结果表明:结圈物由熔融物包裹球团形成,接近窑壁,其熔融包裹物增多,结圈物中MFe、CaO含量明显增大,软熔温度越低;由球团粉末中FeO与SiO2形成的铁橄榄石及煤灰带入的CaO而形成的钙铁辉石低熔点相是造成结圈的主要原因;低熔点相的存在同时也促进了金属化球团间铁晶粒的相互扩散与迁移,从而加剧了结圈现象. 相似文献
10.
11.
12.
Federico Waisman Kurtis Gurley Mircea Grigoriu Ahsan Kareem 《Canadian Metallurgical Quarterly》2002,128(7):730-741
Significant interest has been shown in identifying the nonlinear mechanisms that induce a ringing type response in offshore structural systems. This high frequency transient type response has been observed in offshore systems, particularly in tension leg platforms (TLPs). Given the implications of this behavior on the fatigue life of TLP tendons, it is essential that ringing be considered in the overall response evaluation. This study presents two non-Gaussian probabilistic models of nonlinear viscous hydrodynamic wave forces that induce ringing. The response of a single-degree-of-freedom system exposed to these non-Gaussian wave force models is then evaluated using analytical and numerical studies based on the It? differentiation rule and the Monte Carlo simulation procedure, respectively. The results demonstrate that the proposed models induce ringing type response in a simplified structure. This study provides a probabilistic framework for modeling ringing type phenomenon which will serve as a building block for more refined hydrodynamic load models. 相似文献
13.
14.
马勇 《金属材料与冶金工程》2003,31(1):21-24
通过煤种,入窑球冷态强度和还原过程强度,以及钛精矿与煤灰混合物的软化温度等分析探讨了钛精矿预热球团回转窑直接还原产生结圈的可能性,获得了可以避免结圈的结论。 相似文献
15.
通过在尾矿坝模型内部埋设一种由波导杆和钢珠组成的“导波计”,研究坝体溃坝过程特征与“导波计”采集的导波信号演化规律的关系,验证导波技术用于尾矿坝安全监测的可行性。研究结果表明:试验各阶段的导波振铃参数具有不同的特征,在滑移阶段振铃值出现剧增,在此之前,振铃计数率从“无-有”的变化过程,可视作为滑移破坏前兆; 导波振铃参数序列具有显著的分形特征,分形曲线演化模式为“上升-下降”的趋势,且在坝体滑移期达到最大值; 试验过程中的导波主频主要位于两个频段带,并且在微裂缝扩展贯通阶段会出现“异常”主频信号。 相似文献
16.
By the time you read this, the APA Publications and Communications Board's quest for the next Editor of the Journal of Educational Psychology will be well underway. Insofar as ringing in a new implies ringing out an old, let me take this penultimate Editorial occasion to relate a few additional "things you should know about the Journal" (Levin, 1994, p. 3) during the Journal's impending transition in editorship. The following "things" should represent a little something for everybody. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
17.
链篦机─回转窑直接还原的工程原理概述 总被引:1,自引:0,他引:1
论述了链篦机──回转窑直接还原的工程原理.对如何避免和防止结圈。实现链篦机──回转窑长期、稳定作业的原则进行了深入探讨。 相似文献
18.
徐英 《冶金设备管理与维修》2013,(3):58-59,63
莱钢在新建的120万t链篦机一回转窑生产线上通过严格控制原燃料质量、建立严格的焙烧制度,采取了有效措施,改进设备及优化热工制度,有效防止了结圈,取得了显著效果 相似文献
19.
冷固结球团煤基直接还原新工艺及其应用 总被引:1,自引:0,他引:1
介绍了铁精矿冷因结球团煤基直接还原新工艺流程,分析影响球团产量和质量的主要因素,探讨了球团在回转窑中的直接还原机理和回转窑结圈的机理。 相似文献