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1.
大冶诺兰达炉炉结形成及处理的探讨   总被引:1,自引:0,他引:1  
谭军  黄毅 《有色冶炼》1999,28(5):19-21
通过对诺兰达炉炉结的洗炉,停炉后的测量,结合取样分析,生产中的观察,讨论了炉结形成的原因,洗炉的效果,得出了今后诺兰达炉生产中控制炉结的生产成以及洗炉时注意的问题。  相似文献   

2.
4^#120m^3高炉停炉大修,其炉缸炉底侵蚀形状较炼铸造铁高炉发生很大变化,研究分析炉缸炉底侵蚀情况,对今后护炉工作具有重要意义。  相似文献   

3.
武钢4号高炉炉底炉缸破损调查分析   总被引:3,自引:0,他引:3  
宋木森  邹明金 《炼铁》1997,16(6):14-17
武钢4号高炉(2516m^3)第二代炉役采用了全炭砖水冷薄炉底结构,一代炉役寿命达11年6个月,停炉大修时的破损调查表明,炉底炉缸的破损严重,究其原因主要是采用的普通炭砖质量差。因炭砖质量差,开炉仅1年半,炉基温度就升高到560℃,此后便开始了长达10年的钒钛矿护炉,确保了炉底炉缸的生产安全,炉底炉缸的破损调查结果也表明钒钛矿护炉是富有成效的。  相似文献   

4.
为了保障高炉安全生产,根据太钢三号高炉热电偶历史最高数据预测了炉缸炉底浸蚀状况,同时应用该软件分析铁水流动、耐材导热系数、死铁层深度和高炉异常对炉缸炉底的浸蚀影响,并得出炉缸炉底长寿的若干推论,对评价目前浸蚀状况和护炉及未来太钢长寿、高效高炉的建设提出若干参考意见。  相似文献   

5.
韩宏松 《梅山科技》2007,(B09):33-35
对传统的护炉手段在炉役后期炉缸维护上的作用和弊端进行了分析,提出通过上下部制度优化实现对炉缸的维护,应该作为一个长期有效的护炉手段,以达到高炉长寿目的。  相似文献   

6.
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。  相似文献   

7.
转炉炉壁厚达到300mm左右时进入炉役后期,通过优化冶炼操作、强化溅渣护炉、补炉方法维护炉况,实现冶炼品种钢的目的,取得了明显效果。  相似文献   

8.
王映宏  迟建生  赵思  覃昌倬 《炼铁》2003,22(3):10-12
对武钢高炉炉缸、炉底技术管理的主要经验进行了总结。武钢通过抓好高炉炉缸炉底设计、高炉操作以及炉缸炉底日常维护管理,使高炉炉缸、炉底各部位热流强度均处在受控范围内,大大延长了高炉炉缸、炉底的使用寿命。  相似文献   

9.
济钢在120m^3高炉炉役后期采取增设炉底冷却水管及钒钛矿护炉的措施,解决了护炉和强化冶炼的矛盾,在确保安全生产的基础上.通过采取优化炉科结构、推行大科批技术等强化冶炼措施,高炉炉役后期取得了较好的技术经济指标,利用系数达到了3.257t/(m^3.d).  相似文献   

10.
高炉炉缸炉底侵蚀模型的开发及应用   总被引:1,自引:0,他引:1  
用有限元法建立了高炉炉缸炉底侵蚀推测二维模型,可在线提供高炉炉缸炉底温度场及侵蚀线图,为高炉安全生产,实现高炉长寿和炉缸炉底的结构参数优化设计提供了依据。  相似文献   

11.
转炉炉壳热应力分析   总被引:5,自引:1,他引:4  
任学平  郭志强  邹家祥 《炼钢》2001,17(6):47-49
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。  相似文献   

12.
13.
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.  相似文献   

14.
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。  相似文献   

15.
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)  相似文献   

16.
17.
The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.  相似文献   

18.
鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".  相似文献   

19.
张兴强  叶运福 《冶金设备》2005,(6):71-72,47
针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。  相似文献   

20.
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.  相似文献   

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