济钢烧结余热利用

济钢烧结采用分段回收的节能技术组合,即同时采用余热发电、余热锅炉和热风点火、热风烧结以及混合料预热等多种有效的回收形式对烧结余热加以全面利用,取得了明显的节能效果。     

烧结余热锅炉并联发电系统模型与调控方法

 针对烧结余热发电系统运行稳定性差及停机率较高的问题,基于概率理论建立了多台烧结余热锅炉并联运行发电系统数学模型,分析了余热锅炉工作状态对余热发电系统稳定运行的影响,提出了烧结余热锅炉与发电系统稳定运行方案和蒸汽量调控策略。现场数据表明,多台余热锅炉并联运行,发电机组运行稳定性改善;4台余热锅炉并联共用1台发电机组的烧结余热发电系统,3台及以上余热锅炉正常工作,即可保证系统稳定运行概率大于0.98;当系统蒸汽量不足时,通过管网调入蒸汽,发电系统稳定运行概率可达到0.96以上。     

冶金企业烧结冷却机余热发电技术开发及应用

烧结冷却机余热发电技术是利用烧结冷却机中低温的废气通过余热锅炉产生蒸汽,来推动汽轮机组做功发电.本文对烧结冷却机纯低温余热发电热力工艺系统、热力参数等特点及发电能力进行了探讨、分析、比较,通过工程实例及结论,为合理选择余热发电技术及提高发电能力提供参考.     

烧结余热回收发电关键技术

烧结余热发电技术是钢铁工业提高能源利用效率,实现可持续发展的重要途径之一.针对烧结余热资源品质较低、波动大等特点,提出并分析了余热回收与烟气处理、热源参数预测、余热回收工艺与废气温度调节、废气循环与烧结矿冷却制度优化、余热锅炉与发电系统选型优化等关键技术,认为:烧结余热回收应以冷却机废气余热回收为主,并重点保证系统稳定...     

烧结带冷机烟气余热测试研究

马钢烧结带冷机废气余热发电系统,有两条烧结冷却生产线的余热回收约60%,还有约40%的热量排空浪费,发电机也远远没有达到它的装机容量.因此,为了定量地将余热利用系统的热能分布明细, 明确热量损失原因,对马钢2号烧结机带冷机余热进行了全面测定,提出了提高锅炉效率的措施.     

烧结余热发电技术及系统的优化分析

简要介绍了烧结余热发电技术及系统流程,提出了以余热有效利用率来评价烧结余热发电系统的性能.通过对不同工况下烧结余热发电系统的发电量进行理论计算和比较,同时考虑生产设备及运行限制因素,对烧结余热烟气参数进行了优化选取.通过建立烧结余热发电双压系统的热力模型,计算分析了主蒸汽温度、主蒸汽压力、低压蒸汽温度和压力及其选取对系统余热有效利用率的影响和变化规律,为烧结余热发电系统的优化设计与运行提供了较科学的依据.     

烧结机烟道废气余热回收利用

本项目为烧结机余热回收利用二期工程,是回收利用2×360m2烧结机机尾烟道余热,新设置2套余热锅炉,产生蒸汽分别并入一期烧结环冷机余热发电站。烧结余热锅炉系统除盐水、工业水由现有外网供给,机尾余热锅炉采用DCS集中控制系统,考虑设现场电气室,发电主厂房集中控制。大大减少了热源排放,经济效益和环保效益显著。     

烧结余热发电关键技术分析

介绍了烧结余热发电的特点,通过分析烧结余热发电的关键技术,提出了保证系统稳定运行、提高余热回收效率的方法。     

安钢提高烧结余热利用的生产实践

对安钢烧结余热利用的生产实践进行了总结,介绍了安钢两套烧结机余热发电机组的建设、运行情况,并对机组发电情况进行了比对,分析了烧结机机尾余热锅炉和液密封环冷机对发电效果的影响,指出了当前安钢烧结余热利用生产暴露出的问题和存在的不足,并提出了解决办法和改进措施。     

钢铁企业烧结余热和饱和蒸汽综合利用的新途径

利用煤气过热锅炉把饱和蒸汽加热成过热蒸汽,并入烧结余热锅炉产生的蒸汽进行发电。     

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。     

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。     

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.     

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.