钢包运行控制优化实践

运用钢包运行周期方法详细统计了钢包在各环节的停留时间,研究了温降规律,计算出钢包运行周期和合理钢包运行个数,并发现钢包运行期间存在的主要问题是:钢包实际投入运行的个数较多,空包运行时间较长,在线烘包时间较短。通过对钢包运行的优化控制,不但缩短了钢包运行的周期,确定出合理的钢包运行个数,而且使空包运行速度加快,钢包运行的工序时间缩短了10min,基本实现了正常生产情况下的红包出钢。钢包的运行控制对节省能源、降低钢包个数,特别是稳定和降低钢水的浇铸温度、促进连铸的顺行和提高铸坯的质量均有着重要意义。     

变电站综合自动化运行管理探讨

1l0kv及以上电压等级变电站是电力系统中联系发电厂与用户之间不可缺少的环节。变电站的安全运行是电力系统安全运行的重要组成部分,在实际运行中,变电站自动化系统也出现了一些问题,影响到变电站整体的安全、可靠和稳定运行,变电运行工作平凡而责任重大,确保变电站综合自动化系统的运行是变电运行工作的重中之重。文章就运行中的常见问题及解决措施进行探讨。     

集控室空调冷源系统节能探讨

以某电厂电气车间集控室空调系统为研究对象,在冷水机组节能运行的研究中,对冷水机组的运行特性进行了分析,描述了冷水机组运行能耗计算的公式及方法,以此为基础模拟计算出冷水机组实际运行方案和最佳运行方案的能耗。     

浅析电力企业变电运行安全管理的有效措施

变电运行安全管理是保证电网稳定运行的重要因素,本文通过对变电运行模式,以及在运行中存在的问题进行分析,以期阐述变电运行在进行安全管理过程中所应采取的有效措施和手段,为将来进行的电力系统变电运行模式的优化提供了很好的实践经验.     

2500m^3高炉循环冷却水系统水质控制分析

通过对马钢2#500m^3高炉循环冷却水实际运行、控制情况的分析,总结了高炉循环冷却水在运行过程中水质稳定的运行管理在线监测与控制,以及系统杀生的过程管理等,分析了系统存在运行管理中的不足。采取措施提高高炉循环冷却水在线运行控制的效果与水平,为高炉的稳定运行提供了良好的外部环境。     

变压器铁芯的实验分析及处理建议

为提高电力系统运行稳定性,深入探讨变压器铁芯在运行中故障的解决方法。首先根据变压器铁芯运行原理,并且结合实验分析的方式总结铁芯故障实验方法以及比较常见的故障种类,分别制定铁芯故障解决方案,指导变压器实际运行过程中的故障判断及处理方案应用,确保变压器安全稳定运行。     

高炉卷扬测速电机改造

高炉卷扬测速电机是用于反馈料车运行速度、控制和保护上料系统的装置。为保证测速电机及高炉上料系统的正常运行,采取一系列改进措施,保证测速电机正常运行,从而保证高炉生产运行正常。     

优化气柜控制功能,保证气柜安全挂网运行

针对马钢第一能源总厂20万m3气柜运行中出现的问题,对气柜控制功能进行优化,根据气柜平常挂网运行的模式,在控制系统中分别编制了"挂网运行"、"只进不出"和"只出不进"三套独立运行的控制程序,实现气柜半无人值守,减少操作人员对气柜运行过程的干预,并在各种操作方式中加入必要的连锁功能,保证气柜安全挂网运行。     

体系运行有效性的探讨

讨论了关于体系运行有效性的问题,阐述了判断体系运行是否有效的依据,提出了提高体系运行有效性关键在于组织本身,并对如何提高体系运行的有效性谈了个人的看法。     

钢铁冶金过程铁前工序绿色智能制造的进展与展望

随着“碳达峰”“碳中和”“低碳冶金”等概念的提出,钢铁行业的绿色智能制造已成为大势所趋。铁前工序是钢铁冶金过程的前端工序,也是主要的能源消耗环节。因此,实现铁前工序的绿色智能制造具有重要的经济价值和环保意义。围绕钢铁冶金过程铁前工序绿色智能制造,以“智能碳使用”的低碳冶金技术为核心,综述铁前工序运行状态智能感知、运行参数智能控制、运行性能智能优化和智能协同管控4个方面的研究进展。运行状态智能感知是获取难以检测运行状态信息的主要手段,包括运行状态监测和运行状态识别。运行参数智能控制是实现铁前工序运行状态正常的前提,包括基于人工经验的智能控制、基于参数预测的智能控制和面向多目标集成智能控制。运行性能智能优化是提升运行状态的运行性能的主要措施,包括操作参数智能优化和运行指标智能优化。钢铁冶金过程智能协同管控着重研究感知、控制和优化技术的协同融合。最后,分析当前存在的机遇与挑战,铁前大数据分析和运行状态智能感知、铁前工序一体化智能协同管控和铁前工序全流程性能提升与优化控制或将成为铁前工序绿色智能制造的前景方向。     

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。     

显微维氏硬度测量不确定度评定

对显微维氏硬度测量不确定度进行评定，建立了不确定度计算的数学模型，确定了影响实验结果的各项因素，计算出了各因素的标准不确定度，得出结果的扩展不确定度，并给出最终测量结果的表达式。     

Concept of freedom of infection of animal flocks

Totally negative results of epidemiological investigation of random samples do not prove the absence of the infection as the pathogen may be restricted to only a few animals in the herd for a long time. The statement "absence of infection" is critical for such situations. The question is raised, whether the statement "absence of infection" should be generally avoided. Classification of herds and flocks according to the prevalence of the pathogen would be more valid for the implementation of control measures.     

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。     

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。