高炉风口回旋区特征的研究现状

高炉风口回旋区是高炉内的重要反应区域,回旋区的形成和反应情况,将直接影响着高炉下部煤气的分布、上部炉料的均衡下降以及整个高炉内的传热传质过程,因此,对高炉风口回旋区特征研究对创造最佳化的高炉冶炼条件具有相当重要的意义。     

关于鞍钢7号高炉生产技术问题的探讨

鞍钢7号高炉各项技术经济指标不够理想的主要原因是,原燃料条件与炉容不相适应,有效高度偏高,炉喉高度偏高,风口数量偏多。因此建议先堵4个风口,待高炉正常后将φ160mm的风口改为φ140mm的风口(26个风口全部工作),在上部调剂方面采用深料线操作制度,借以增加炉料有效重量,促进高炉顺行。     

高炉布料过程初步分析

近年来,国外广泛地采用炉喉挡料板,无钟炉顶的装料设备也日益增多,这就极大地丰富了高炉上部调剂的内容和措施.然而,以目前鞍钢的状况而言,钟式装料设备仍然是唯一的装料设备.尽管装料设备种类繁多,其控制煤气流分布都是以下列几种作用因素,改变高炉径向的焦炭负荷分布来实现的,即:1. 炉料在料面上的堆尖位置;2. 炉料在料面上的堆角;3. 炉料对料面的冲击作用;4. 炉料性质差异所引起的效应.高炉冶炼工作者,就是以上述因素,控制炉料的分布状态,以达到充分利用煤气能量的目的.本文将以简单的力学关系分述上述有关影响布料的因素.     

高炉炉缸工作的初步研究

风口前焦炭燃烧所引起的炉料下降,是整个高炉料柱运动的前导,是决定高炉降料过程的主要因素,大型高炉的炼铁工作者曾对高炉风口前焦炭燃烧过程进行了专门研究,从高炉解剖到采用现代化的高速摄影等科学研究方法获得了成功的经验,对现场生     

高炉炉料的空隙度

一,一般概念 高炉炉料的空隙度,对料柱透气性和炉况顺行的影响极大。国内外高炉工作者对高炉炉料空隙度的研究始终是十分重视的。 高炉就其实质而言,是一个逆流式层状充填料化学反应器(如图1)。高炉冶炼过程中,风口前热风与燃料燃烧产生的高温煤气流,在上升过程中与不断下降的散料状料柱相接触,使两个逆流流股间进行着动量传     

用一比一大模型测定炉料落下轨迹的研究

一、前言掌握准确的炉料落下轨迹是高炉上部调剂操作、装料装置设计以及布料理论分析和计算的基本依据。上部调剂的重要内容之一就是通过控制和调节料流轨迹即炉料落点、堆尖形成位置和各部分的料层厚度,来满足冶炼过程对矿焦比的分布和煤气分布的要求。现代化大型高炉采用变径炉喉和无钟布料等新技术的成功也进一步     

高炉炉衬的侵蚀与改革风口安装的研究

为深化高炉冶炼理论,提高炼铁生产技术,近年来,国内外进行了高炉解剖研究,取得了炉内状况的丰富资料(炉料分布及下降情况,炉内温度分布与炉料的还原、软化、熔融及滴落状态)。同时也获得了高炉各部位侵蚀后真实的操作炉型,进而认识了碱金属(K_2O+Na_2O)对炉衬材料的侵蚀和对高炉操作的危害。本文从回旋区的解剖,碱金属侵蚀机理、风口区域的侵蚀与风口位移出发,提出斜风口和风口斜装对高炉冶炼的作用,从而要求改革传统的风口水平安装,建议新建或大修大高炉时,将风口由水平安装改为往下倾斜5°安装,可减少风口损坏,增铁节焦。     

武钢有限7号高炉炉况诊断系统的开发和应用

开发了武钢有限7号高炉炉况诊断系统,包括炉顶料面雷达监测系统、炉身上部料层结构模型、高热负荷区域的铜冷却壁热面渣皮监测模型,以及武钢高炉专家系统中的过程参数计算、炉况状态的模式识别等内容,并建立了案例库和知识库.炉顶料面雷达监测系统和炉身上部料层结构模型能够直观反映高炉料面形状和上部炉料下降过程,为高炉调控布料提供了重...     

高炉上部煤气流调剂影响研究

利用数值模拟对煤气流的流场及温度场进行了计算.根据高炉不同部位的煤气流速分布,分析得出炉料分布对中上部煤气流分布和软熔带形状有决定作用,而鼓风制度可快速改变下部煤气流分布,并结合实际高炉中的现象及操作讨论了炉料分布的重要性.结果表明:在高炉生产中,有一个合理的布料制度是高炉操作的关键,径向煤气流分布受炉料透气性分布影响很大,初始煤气流对其影响较小,下部煤气流分布信息很难在上部反应.     

高炉炉缸工作的初步研究

风口前焦炭燃烧所引起的炉料下降,是整个高炉料柱运动的前导,是决定高炉降料过程的主要因素,大型高炉的炼铁工作者曾对高炉风口前焦炭燃烧过程进行了专门研究,从高炉解剖到采用现代化高速摄影等科学研究方法获得了成功的经验,对现场生产起了指导性的作用。我国中、小型高炉由于受技术设备的限制很少进行此项工作,单纯凭热工检测仪表     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.