高炉炉缸炉底结构设计研究

简述了高炉炉缸炉底结构发展的过程及目前国外高炉炉缸炉底所采用的形式；介绍了鞍钢７号高炉炉缸炉底的设计情况，并总结了其采用的陶瓷杯结构和半石墨化碳砖的优点。     

短流程强化底吹炼铜炉炉型升级的数值模拟与工程实践

建立了三维底吹熔炼炉数学模型,对熔池气相分布和动量分布规律进行了研究,为底吹炉炉体的升级改造提供了基准和重要参数。根据数值模拟研究结果,提出易门铜业底吹炉设备本体改造方案及现场施工方案的细化。底吹炉本体采用三托辊支撑,并在厂房内进行现场切割加长改造;底吹炉加长段现场施工空间狭小,创新现场改造方案,采用特殊设备折壁吊在原有厂房内实施炉体吊装,实现了41天完成现场改造。     

25m环形炉炉底机械设计研究

结合某厂25m环形炉工程对环形炉设计做了简要的介绍,对环形炉炉底机械结构特点进行了阐述,并对主要构件给出了设计计算方法。     

高炉炉缸炉底破损研究

根据近年来武钢2座大型高炉破损调查的资料,分析炉缸、炉底耐火材料破损的特征和原因。炉缸、炉底产生环形裂缝的主要原因是碱金属和锌的侵蚀,重点讨论锌对产生环形裂缝的影响。基于对炉衬侵蚀机理的分析,提出了能满足炉缸、炉底长寿要求的适宜的耐火材料。用于炉缸、炉底的耐火材料应具备导热率高、微孔或超微孔、抗铁水渗透性好和抗铁水熔蚀性好等性能。     

莱钢2~#高炉炉底炉缸侵蚀分析与长寿改造

莱钢2#高炉因炉缸侧壁温度异常升高而停炉大修,在炉缸炉底拆除过程中,发现炉缸出现象脚侵蚀,炉底出现锅底状侵蚀等异常侵蚀现象。通过选用优质耐材、优化砌筑结构、完善炉底侵蚀监测系统,对高炉炉缸炉底进行了长寿改造,达到了预期效果。     

固定式阳极炉反拱式炉底的挖修实践及改进

介固定式阳极炉的反拱式炉底由于采用死炉底设计,炉底检修的常规方法是进行阳极炉大修。文中阐述了炉底的点破坏的损耗特点及成因。介绍了炉底局部挖修方案,方案实施过程中炉底冷凝铜对拆除过程的影响及最终的解决措施。总结了炉底挖修的实践效果。提出了炉底挖修的改进方向。     

转底炉炉底机械的设计分析

针对炉底机械的结构组成进行了介绍,对支撑辊和传动装置的设计计算进行了理论分析,利用VC++编制程序进行辅助设计,提高了设计效率,通过实例分析验证了炉底机械设计分析的正确性。     

常化炉炉底辊道链传动系统改造

1　前言为满足国内外宽厚板市场的需要 ,扩大生产品种 ,提高钢板综合性能 ,增强市场竞争力 ,根据用户需求 ,公司生产的钢板大部分需热处理 ,轧钢厂常化炉担负着厚 70 mm以下钢板的正火、回火等热处理任务。辊底式常化炉其优点主要是 :1 )可以生产品种多、规格复杂 ,加热工艺制度要求较高的钢。2 )钢板在整个加热过程中随炉底辊一起转动 ,不需要拨钢或翻钢操作 ,与炉底没有摩擦和振动。3)钢在炉内受热均匀 ,避免了“黑印”产生。4)炉子易排空 ,避免钢在炉内长期停留。5 )炉子机械自动化程度高 ,装料、出料及钢在炉内运行均可自动进行。尽管常…     

硅钢连退炉炉底辊结瘤影响因素及控制措施

通过理论分析和现场试验,分析了连退炉炉底辊结瘤产生的影响因素。在生产中,通过减少铁皮带入,控制炉内的气氛、露点及主要工艺段温度,减少炉内张力和在线磨辊等措施,能够有效减少炉底辊结瘤的发生。     

步进炉底用预制块的设计

步进炉是轧钢生产的重要设备，它的工作状况直接影响着轧钢生产及产品的质量。该厂步进炉底通常采用低水泥浇注料浇注，不仅施工期长，而且烘炉效果常常无法保证，从而导致了步进炉底使用寿命短严重地影响，轧钢生产的正常进行。笔者通过查找资料并结合工作经验认为，该厂步进炉底采用预制块来砌筑，便可消除其在烘炉过程中产生爆炸的现象，取得良好的烘炉效果，从而延长步进炉底的使用寿命，增加产量，提高产品质量。     

论从实践理解世界的物质性和自然世界的先在性

马克思主义唯物论是一种物本主义形态的唯物论,还是一种超越物本主义形态、从实践理解世界的本质相关问题的实践的唯物主义的唯物论?这是一个我们必须搞清楚的有关马克思主义唯物论的本质规定性和精神实质的重大问题.在考察物本主义的唯物论及其思维方式的局限性的基础上,揭示了马克思主义唯物论是现代的、实践的唯物主义,并重点研讨了马克思主义唯物论关于从实践理解世界的物质性和自然世界的先在性的原理,以期为马克思主义唯物论进一步阐明人类世界的实践性原理奠定基础.     

Effect of cyproheptadine on the ultrastructure of the neurons of the arcuate nucleus in the hypothalamus of the rat

The data are presented on changes in the rat arcuate nuclear neuron ultrastructure after using cyproheptadine (peritol, Egyt Pharmaceutical Works, Hungary) in a water suspension at a dose of 20 mg/kg once daily during 7 successive days and twice a day within 10 days. It was shown that cyproheptadine decreases the functional activity of the arcuate nuclear neurons, depending on the total amount of the drug used. Cyproheptadine-induced inhibition of the forming neurohormone release from neurons is likely to be one of the mechanisms of its therapeutic effect in Itsenko-Cushing's disease.     

Characteristics of the sympathetic innervation of the nictitating membrane and of the vasculature of the nose and tongue of the cat

Vasomotor responses from the nasal mucosa and tongue, and contractions of the nictitating membrane, were recorded on stimulation of the cervical sympathetic or internal carotid nerves. Preganglionic sympathetic nerve fibres which elicited a membrane response possessed a lower threshold than those which evoked nasal vasoconstriction, while the latter displayed a lower threshold than fibres which evoked tongue vasoconstriction. The sympathetic vasodilator fibres to the tongue whose activity was revealed after alpha-receptor blockade, had a similar threshold to the vasoconstrictor fibres. Membrane contraction, nasal vasoconstriction and occasionally tongue vasoconstriction could be evoked by stimulating the internal carotid nerve. The postganglionic fibres innervating the nasal mucosa had a similar threshold to those of the nictitating membrane, which may indicate that there are small myelinated fibres innervating the mucosa. The preganglionic compound nerve action potential had four major components, S1-S4. S1, S2 and usually S3 fibres were associated with membrane contraction; S2, S3 and sometimes S1 fibres were associated with nasal vasoconstriction; and S3, usually S2 and occasionally S1 fibres were associated with vasoconstriction in the tongue. It is concluded that each of these three groups of nerve fibres, but not S4 fibres, may include fibres associated functionally with the three effectors. There was a considerable difference between the relative amplitude of the responses of the three effectors elicited by stimulation of the cervical sympathetic nerve at frequencies between 0.2 and 2 Hz. Vasoconstrictor responses were relatively larger than membrane contractions suggesting differences in the mechanisms of neurotransmission at the neuroeffector junctions.     

董东矿沿空留巷切顶卸压对底板受力影响分析

以董东矿50107工作面为研究对象,通过数值模拟软件FLAC3D建立模型,对比分析窄矿柱、宽矿柱以及切顶沿空留巷情况下围岩及底板受力特征,确定切顶沿空留巷切顶对围岩的卸压作用。对比分析围岩受力情况,表明切顶沿空留巷卸压效果比较明显,对比分析围岩塑性区的底板破坏深度,表明有利于切顶沿空留巷卸压效果明显,切顶沿空留巷有很好的卸压效果,有利于矿山巷道围岩控制。