莱钢混铁炉长寿技术的应用

为提高混铁炉寿命,炼钢厂银山前区600t混铁炉应用侧兑铁工艺、整体浇注工艺、短流程套浇出铁口技术、成套长寿命维护技术等,使混铁炉寿命达到42个月,通铁量达到410万t。     

1300t混铁炉出铁口拱的改进与施工

一、基本情况攀钢提钒炼钢厂的两座1300t混铁炉,经过十多年的生产实践的检验证明,出铁口拱早期塌落的缺陷,是耐火内衬的砌体结构满足不了该炉的生产条件要求。改进前,1号混铁炉检修完后使用不到9个月,2号混铁炉使用不到7个月,都因为出铁口拱塌落导致混铁炉主拱的破坏而被迫停产进行检修。     

武钢一炼钢平改转工程简介

武钢一炼钢厂原有固定式平炉８座，１３００ｔ混铁炉２座，全模铸。８０年代中期改造成６座５００ｔ氧气顶吹平炉，生产能力３００万ｔａ。１９９４年３季度，增建２５０ｔＬＦ精炼炉和８机８流方坯连铸机各１台。截止１９９７年底已生产钢６１７８万ｔ，占武钢产钢总量的６０％。为调整武钢的工艺和产品结构，增强市场竞争力，武钢决定高起点的改造一炼钢厂。目标瞄准市场短缺、技术含量和附加值均高的以钢帘线为代表的硬线钢，改造内容必须确保这一目标。改造是在１９９８年生产１００万ｔ平炉钢的条件下进行的，工期短、要求高、投资省…     

国外混铁炉烟气净化技术

国外混铁炉烟气净化技术据国外一些技术资料的介绍，国外在温铁炉烟气捕集上做了大量的研究工作，其技术主要有以下几种：一、兑铁口烟气捕集技术①炉内排烟此方法是直接从混铁炉内抽吸一定的烟气，使混铁炉内保持一定负压，迫使炉内烟气个从兑铁口外冒，从而达到控制烟尘...     

鄂钢二炼钢分厂实现全连铸

鄂钢二炼钢分厂实现全连铸１９９７年１２月７日零时起，鄂城钢铁集团有限责任公司二炼钢厂正式淘汰模铸工艺实现全连铸。二炼钢分厂原有２０ｔ氧气顶吹转炉两座，一座６００ｔ混铁炉，２台小方坯连铸机，１９９６年产钢４７．７３万ｔ，连铸比６８．５３％。为了节能降耗...     

用红外测温技术延长混铁炉的寿命

我公司第二炼钢厂是中型氧气顶吹转炉炼钢厂。600t混铁炉是协调3座15t转炉生产的主要设备,并能均衡各炉铁水的化学成分,同时,它又起着铁水的储备和保温作用,直接保证转炉均衡、连续地生产。 1989年7月中旬,600t混铁炉的检修周期已到,考虑到公司的全局计划,是否停炉检修,意见不统一。公司领导组织有关专业     

提高600t混铁炉炉龄的措施

结合莱钢炼钢厂６００ｔ混铁炉的实际生产状况,采取热喷补修补炉内薄弱环节、严格工艺操作等措施,使混铁炉的使用寿命由平均不足３１２ｄ提高到５０５ｄ,铁水吞吐量由７０万ｔ提高到１３２万ｔ     

攀钢炼钢厂混铁炉兑铁口改造

针对攀钢炼钢厂混铁炉兑铁时存在的问题,对混铁炉兑铁方式进行改造,由顶进铁改为侧进铁.实践证明改造是合理的、适用的,达到了预期的效果.     

红钢转炉二次除尘及混铁炉除尘工艺

根据烟气的特性,在转炉炉前、炉后设置捕集点,对二次烟气进行捕集;在混铁炉兑铁口和出铁口设置捕集点,对混铁炉烟气进行捕集.除尘系统采用负压操作,自动控制,经除尘后排放烟气低于国家排放标准,操作场地含尘量符合国家卫生标准.     

控制高炉操作的计算机系统

控制高炉操作的计算机系统［芬兰］ＰｅｋｋａＩｎｋａｌａ等１前言芬兰劳塔鲁基钢铁公司有两座高炉，年产铁水２．２×１０６ｔ。这两座高炉的容积均为１０３３ｍ３，有效容积８９３ｍ３，炉缸直径７．２ｍ，出铁口１个，风口１４个，热风炉３座。降低能耗是降低高炉生产...     

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)     

Comparison of rates of infection of two methods of emergency ventricular drainage

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.     

浅析《野草》的版画特征

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".     

四辊破碎机车刀架的改造

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。     

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。     

Comparison of the results of surgical and conservative treatment of fractures of the diaphysis of the tibia

In this paper is treated the fundamental problematic of the fracture of the diaphysis of the tibia and the therapeutic results after the conservative and operative treatment are confronted. Among 518 patients with 433 open fractures and 35 with closed fractures of the diaphysis of the tibia, successful treatment of more 2/3 was obtained in the period from 1968 to 1972. Following our casuistics and literature, whose results are similar, we find out that the average total treatment of the osteosynthesis of the fracture of the diaphysis was shortened for 2,5 months depending upon the type and the localisation of the fracture. Apolied methods of the operative and conservative and conservative treatment in relation to the velocity of the medical cure as well as to the extreme anatomical-functional results are analised. We noticed that osteosynthesis, made by the intermedullary nail and the extension of the canals or by a small AO table, by the achieved stability makes conditions of immediate motions and an early rehabilitation. Because of that it gives the best functional results.     

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.     

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。     

参与式农业基地建设行动方案设计

为了编制实用性强的基地建设行动方案,首先,确定参与式发展的主体,搭建一个"决策框架";其次,针对行动目标,提出不同参与主体,如管理者、农民、消费者等团队与个人的目标及行动内容;最后,工作应向重塑伙伴式合作关系,挖掘农民自我发展潜力,完成三大角色的转换,打造农业基地文化等方向推进.