润滑技术新理念——油气润滑技术在连铸机上的应用

近年来，油气润滑技术作为钢铁行业轴承的一种先进润滑方式，已在世界范围内获得了广泛应用。因为它可以延长轴承的使用寿命，降低设备的运行费用及维护费用，杜绝润滑油外泄对设备运行环境造成的污染，大大降低润滑剂的消耗，节能效益显著。油气润滑技术在新钢新建转炉炼钢工程方坯连铸机上的成功应用，使这一新技术得到了有力的证明。     

煤粉锅炉省煤器磨损原因分析及防护措施

１概述太钢发电厂现有８台电站煤粉锅炉,据全年锅炉设备事故统计表明,省煤器管磨损泄漏事故占锅炉“四管”爆裂事故总数的８０％以上,已成为威胁我厂安全运行的主要问题之一。如何在省煤器的设计、制作、安装、运行等环节上减少磨损对我厂的安全生产、降耗增效具有重要意义。２原因分析我厂锅炉全部采用钢管式省煤器,由于受到含灰气流的冲刷,存在较为严重的飞灰冲蚀磨损,而灰粒对受热面的磨损是一个复杂的物理过程,它既有灰粒的撞击作用,又有灰粒的切削作用。２．１烟气流速锅炉尾部烟气的流速是影响省煤器磨损的主要因素之一。试验…     

燃料变化对75 t/h锅炉过热蒸汽温度的影响

１概述宣钢动力厂两台７５t／h锅炉，均为煤，气混烧锅炉。设计高炉煤气的热负荷份额为３０％，即可掺烧２００００m３／h的煤气量，而在运行中，为了减少高炉煤气放散量、降低煤耗，实际掺烧的高炉煤气量远大于设计量。由于燃料的变化，造成了锅炉过热蒸汽温度的变化，影响了锅炉的安全运行。２燃料燃烧计算２．１高炉煤气燃烧计算２．１．１高炉煤气的成分及发热值，见表１。表１高炉煤气成分及热值２．１．２燃煤气理论烟气量计算，见表２示。CO／％CO２／％N２／％H２／％２４．１２１８．４９５４．６２１．４４CH４／％O２／％发…     

炼钢转炉余热锅炉的改进设计

炼钢转炉余热锅炉关系到能源的回收利用，并对炼钢过程产生直接影响，其安全运行至关重要文中分析了原炼钢转炉余热锅炉设计中普遍存在的问题，介绍了一台炼钢转炉余热锅炉的改进设计。     

熄火保护在燃煤气锅炉上的应用

１前言武钢能源总厂热力厂ＨＧ７５／３９－４型锅炉系哈尔滨锅炉厂设计制造，原设计燃料为８０％的重油，掺烧２０％的煤气。随着生产的发展。大量的高炉、焦炉、转炉煤气产生。１９８５年将该型号１＃、４＃炉改造为烧８０％煤气，掺烧２０％重油的锅炉以适应公司能源的合理利用，由于缺乏经验，煤气系统的安全措施未能跟上，３＃、４＃炉相继发生了下列事故。１９８９年４月１８日与１９９０年１１月１３日，锅炉在运行中，只有重油与风机的联锁，没有煤气与风机的联锁。由于操作管理不当，停电后未能及时切断煤气，大量煤气进入炉膛，当…     

转炉余热锅炉的应用技巧

转炉余热锅炉在转炉生产中起着十分重要的作用，本文结合我厂120吨转炉余热锅炉运行18个月的经验。从实际操作要领到工况调整的分析，总结出转炉余热锅炉的应用技巧。     

链条炉排故障判断分析及防范措施

根据锅炉运行实际,归纳介绍了主动轮破裂、磨损以后,炉排故障体的运行判断分析及处理技巧和防止措施。     

全钛电力辅机的应用

发电厂的三大动力设备 :锅炉供热系统、汽轮机系统、发电机系统是整个发电厂发电生产的主要组成部分。锅炉供热系统　蒸汽推动汽轮机在高温高压下运行 ,排出气体经过主凝汽机冷却交换后冷凝成水进入水塔 ,再循环供锅炉进水使用 ,还有高介或低介装置的循环。这是热工蒸汽的循环系统 ,也就是主凝汽机的循环工作系统。汽轮机系统　汽轮机主轴在两支座轴承或轴瓦支承下高速运转时 ,产生磨损或摩擦并产生一定热量 ,要带走和消除这些热量必须通过润滑冷却 ,使其摩擦系数降低 ,保持一定温度和润滑量 ,对此润滑油是强注循环的 ,但这些油在循环过程中…     

转炉余热锅炉的应用

转炉余热锅炉在转炉生产中起着十分重要的作用，结合天津钢铁公司120t转炉余热锅炉运行15个月的经验，从安装质量控制、冲洗工序、煮炉等几方面，总结出转炉余热锅炉的操作、控制要领。     

SHL10—13—AⅢ型工业锅炉的节能改造

太钢耐材公司有３台１０ｔ／ｈ工业锅炉,型号为ＳＨＬ１０—１３—ＡⅢ,上海四方锅炉厂制造。自１９８６年冬季投运后,锅炉燃烧工况差,每台锅炉蒸发量在５～６ｔ／ｈ之间,１９９０年５月对２＃锅炉进行了热平衡测试,热效率为６０．５８％,其中机械不完全燃烧损失占２２．９６％,化学不完全燃烧损失占５．０５％．炉渣含碳量在３５％以上,太原市矿化所型煤厂曾把锅炉炉渣拉走制作蜂窝煤。经过多次的观察、调整,发现炉排前部２～３ｍ的范围下着火,着火区域集中在后拱的下部,实际测量炉排的燃烧面积只有５ｍ２（燃烧面积的设计值为…     

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.     

Structure of the attachment of the vocal ligament to the perichondrium of the thyroid cartilage

The ventral attachement of the ligamentum vocale of eleven larynges (new-born and adults has been studied in sagittal, frontal and horizontal sections. 1. Supplementary to the known structure of the ventral attachement of the ligamentum vocale we have noticed collagen fibers which ascend in the inner angle of the thyroid cartilage and which partly cross to the other side. Sometimes a few fibers which are running downward have been observed. This structure of the attachement must be more firm than the known structure. 2. Moreover it has been observed that a lot of the angles of the crossing collagen fibers in the cartilage of the lamina mediana (near the attachement of the ligamentum vocale) are right-angled, whereas the angles of the fibers which lie in the laminae laterales in their majority are acute-angled. This phenomenon also is interpreted as a structure which makes the lamina mediana firmer. The fact, that this structure is not so evident in the specimens of the new-born as in those of the adults indicates that there are postnatal changes in the structure of the lamina mediana.