烧结点火炉的节能设计及应用

烧结点火炉是烧结系统的重要设备,点火能耗约占烧结工序能耗的5%~8%,点火炉设备的工作状况直接影响烧结生产工序的能耗及烧结矿产品的质量。本文对烧结点火炉的节能设计及使用情况进行分析,为钢铁企业节能降耗、降低生产成本、提高产品质量提供理论依据和技术参考。     

安钢铁前系统节能技术的应用

对钢铁工业铁前系统工艺能耗进行了分析,通过介绍干法熄焦技术、烧结余热回收发电技术和高炉炉顶压差发电技术分别在焦化工序、烧结工序和炼铁工序的成功应用,提出钢铁企业节能降耗,特别是铁前系统的节能降耗,既是增强企业竞争力的现实选择,同时也是提高企业经济效益的重要措施.     

钢铁企业降低烧结工序能耗的分析

当前,我国正大力推行可持续发展战略,提倡绿色健康的经济发展,所以对于资源、能源消耗量巨大的钢铁企业要求颇高,节能降耗已是势在必行。而烧结工序作为整个钢铁工艺能耗最高的环节,此环节的能源消耗量将直接影响整个钢铁企业的生产利润与产量。经过研究,采取降低固体燃料、降低电耗、降低点火热耗、提高烧结余热的回收利用、建设钢铁烧结能源管理体系等一系列行为可以有效改善烧结工序,实现节能降耗的目的。     

调整工艺参数、实现烧结节能

针对马钢300 m2烧结机工序能耗一直偏高的问题,通过调整优化熔剂、燃料破碎粒度,改变石灰石破碎系统生产组织模式,调整烧结及冷却过程控制参数等,在确保烧结过程稳定、烧结矿产质量指标良好的同时,降低了电耗、固体燃耗,提高了余热发电量,使烧结工序能耗逐步下降,实现了节能降耗.     

烧结工序能耗限额解读与节能分析

通过对烧结工序能耗进行计算和分析,确定降低烧结固体燃耗、提高烧结余热利用效率为降低烧结工序能耗的主要途径。针对烧结工序能耗结构特征,结合国家、地方产业政策,分析并提出烧结节能潜力及措施。     

钢铁烧结过程中节能减排技术协同生产研究

烧结工序是钢铁生产过程中的主要耗能环节,其能耗通常要占到钢铁企业总能耗的10%左右,仅次于炼铁。在烧结过程中的能耗基数较大,降低烧结过程的能耗量,对减少企业成本有重要意义。管理人员应该积极利用协同手段,采取降低烧结工序能耗的措施,在现有格局下进行优化函数。基于此,本文将主要论述烧结过程节能减排技术协同生产。     

钢铁烧结过程中节能减排技术协同生产研究

烧结工序是钢铁生产过程中的主要耗能环节,其能耗通常要占到钢铁企业总能耗的10%左右,仅次于炼铁。在烧结过程中的能耗基数较大,降低烧结过程的能耗量,对减少企业成本有重要意义。管理人员应该积极利用协同手段,采取降低烧结工序能耗的措施,在现有格局下进行优化函数。基于此,本文将主要论述烧结过程节能减排技术协同生产。     

降低烧结工序能耗的措施

从固体燃耗、电耗、点火热耗、余热利用等方面阐述了降低烧结工序能耗的主要途径,以及安钢烧结厂近年来在节能降耗方面所采取的主要措施。     

武钢炼铁工序能耗现状分析

武钢通过近年“引进、消化、吸收”炼铁先进技术，使炼铁工艺取得长足进步，节能降耗效果显著，工序能耗由1996年的474．4kg／t降低到2003年的446．5kg／t。武钢节能降耗实践表明，精料是降低工序能耗的基础，技术进步和操作水平的提高是降低工序能耗的重要保证。     

八钢430m～2烧结降低工序能耗的措施

八钢430m2烧结机从设计伊始就综合考虑各种节能措施,从各个工序中的固体燃耗、电耗、水耗、煤气消耗、提高混合料温度等方面阐述降低烧结工序能耗的主要途径、方法。并总结了八钢烧结在节能降耗方面所采取的主要措施及取得的效果。     

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。     

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)     

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。     

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.