莱钢中小型材轧机加热炉自动控制系统

介绍了加热炉自动控制系统的硬件配置和系统功能 ,并对步进梁步进自动控制、钢坯自动跟踪、双交叉限幅燃烧控制等的原理和功能作了说明。实际运行结果表明 ,系统运行率达 10 0 % ,炉温控制精度达 1%。     

蓄热式加热炉PLC控制的开发设计

主要阐述了一种改进型的蓄热式加热炉,控制系统采用了PLC控制技术,使蓄热式加热炉的恒温及点火都实现了自动控制,从而使蓄热式加热炉实现了全自动化的控制.此种蓄热式加热炉可广泛应用于铝厂,钢厂等金属冶炼、金属加工行业.     

步进式加热炉板坯跟踪系统的开发

以工控机、服务器和西门子S7-400的PLC为平台开发的鄂钢4 300 mm宽厚板加热炉电气系统,其主要功能为炉外上料辊道的自动控制、炉尾钢坯自动定位、装钢机智能确定装钢行程及动作、步进梁自动运行、出钢机智能定位取钢行程及动作、出料辊道自动运行、液压站的液压自动控制等.这些功能由PLC完成数据的采集和处理、数据传送和控制程序的运算并输出.并以两门子的Wincc作为上位机和服务器平台,实现了两台加热炉的集中显示和操作.     

煤气环形加热炉智能燃烧系统改造

包钢钢管公司Φ180 mm机组煤气环形加热炉是钢管生产轧制过程中最重要的设备.文章分析了煤气环形加热炉燃烧控制系统存在煤气热值不稳定、流量元件检测不准、阀门流量特性偏失等缺陷,采取了升级温度控制程序,引入空气过剩系数自动修正策略,预留空燃比自动调节接口,新增空气总管压力自动控制,新增炉压自动控制软件,新增自动启炉和气密测试功能,新增回路基本报警、连锁等燃烧控制系统智能化升级的改造措施,最终实现了较为稳定的智能燃烧系统.     

浅谈步进梁式加热炉自动化控制

文章探讨了2250热轧板厂步进梁式加热炉板坯过程自动化跟踪,建立有利于实现燃烧系统的自动控制系统,提高板坯加热质量。     

浅谈步进梁式加热炉自动化控制

探讨了涟钢2250热轧板厂步进梁式加热炉板坯过程自动化跟踪,建立了有利于实现燃烧系统的自动控制系统,提高了板坯加热质量。     

步进式轧钢加热炉步进梁的控制

以工控机、服务器和西门子S7-400系列的PLC为平台,开发加热炉步进梁电气控制系统,以液压为动力源,包括现场位置信号的采集,以及对液压比例放大板的控制构成闭环系统.并以西门子的Wincc作为上位机和服务器平台,实现了加热炉步进梁的集中显示和操作.     

承钢1780热轧厂加热炉过程控制

承钢1780热轧厂加热炉过程机应用系统主要包括轧制计划管理、设定、跟踪、实际数据处理、热装支持、通信等模块,与其运行在同一平台下的是自动燃烧控制模型(ACC),应用系统和ACC共同构成加热炉的过程控制系统.应用系统实现对1#-3#加热炉的炉前辊道、装出钢机、炉内步进梁的运行控制;板坯核对、吊销、返回等操作;生产数据管理、材料跟踪、实际数据处理、画面和报表等功能.ACC实现自动燃烧控制/数据设定;对加热炉内的板坯进行合理加热;准确控制板坯的出炉温度和均匀度.为了达到上述功能,应用系统除了保证物料的正常流程外,还必须考虑各种异常情况,使系统的适应性更强.     

大型蓄热式步进梁式板坯加热炉

济钢中厚板厂3#加热炉是国内较早应用蓄热式燃烧技术的大型步进梁式板坯加热炉,介绍了炉型结构、步进机械、蓄热式燃烧系统、汽化冷却系统和自动控制系统的性能和特点。     

一种加热炉的自动升降温控制系统

针对加热炉自动控制升降温的需求,研发出一套基于S7-1500系列可编程控制器和WINCC人机交互软件的控制系统,应用多温度区段参数的配方化管理技术、前馈-反馈智能控制技术和双交叉串级PID控制技术实现加热炉的自动升降温。系统投用后,运行稳定可靠。     

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)     

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.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.