密闭电石炉加料仓料位测量方式的比较及优化

通过对电石企业环形加料机底下料仓的料位检测方式:γ射线料位开关、射频导纳料位开关、阻旋料位计、重锤料位计、雷达料位计及微波开关等的使用优缺点进行比较,指出了采用改进安装方式的微波开关是目前最好的测量方式,值得在电石行业推广使用。     

选矿生产过程自动检测仪表一览表

类型名称性能及特点料位测皿仪表电阻式料位计?一射线式料位计超声波料位计气泡管式液位计浮子式液位计简单、便宜,做定点信号器用非接触式,做定点信号,要安全防护非接触式,可连续测量料位接触式、简单、可连续测量接触式、简单、用于清水或矿浆矿石重企计量仪表机械式皮带秤电     

SDL料位控制技术在莱钢750m3高炉上的应用

针对750m^2高炉原有料位检测装置中称重料位检测法和振动料位检测法存在检测准确性差，仅能作为备用检测手段，而PNF-1201型核辐射料位计易发生料位测量信号故障，导致高炉休风、慢风的问题，决定采用SDL型闪烁料位计对PNF-1201型核辐射料位计进行改造，使料位检测信号的可靠性大大提高。应用表明，高炉由改造前的平均每年发生料位测量信号故障7．7次、休风12．8h、慢风41h，达到零故障．     

导波雷达料位计在6号高炉的实际应用

本钢炼铁厂6号高炉矿槽、焦槽的料位测量方式,是使用传统的重锤式料位仪。该料位仪机械故障率高,维修成本也高,由于现场环境恶劣,粉尘大,维护人员工作强度大,而且容易影响工人身体健康。于是,从2012开始建议将老旧报废的重锤式料位仪,试探性的更换了几个雷达式料位仪。经过三年时间,运行效果很好,成本也低于重锤式料位仪。因为矿槽,焦槽料位要求条件、精度不是很苛刻的,用国内厂家生产的,完全可以胜任。而且,雷达式料位仪价格低廉(6号高炉用的,雷达式料位计的价格只是重锤式料位计价格一半)运行稳定可靠,零故障免维护。雷达测量技术(非接触式),随着成本的降低和应用中的优异测量效果,得到广大用户的认可。     

西门子LR260雷达料位计在300t／d竖窑上的应用

介绍了料位计在活性石灰气烧竖窑生产工艺中的重要作用和料位计的选型过程。阐述了西门子雷达料位计LR260的测量原理、特点,该物料计应用在活性石灰气烧竖窑上,及时准确地反映了储料槽中的实时料位,其提供的准确信号,实现了加出料的自动控制,稳定了窑顶压力,保证了均匀性煅烧。     

一种新型机械式矿仓料位装置的研究与应用

随着工业自动化水平和控制系统可靠性要求的不断提高,料位精准控制的重要性日益凸显。矿仓料位计因其具有低维护、高性能、高精度等优越性被广泛应用于众多测量领域,然而在市场销售的形色各异的料位计中,目前还无法在特定的环境中做到100%的安全可靠。如何在特定的环境中有效控制矿仓料位,确保设备设施安全,实现生产流程稳定可靠,具有十分重要的意义。本文针对井下矿山的矿仓满溢等问题进行研究,成功设计、制作、应用了一种新型机械式矿仓料位装置,实现了矿仓料位的安全精准检测。     

宣钢2 500 m3高炉喷煤仪表系统

宣钢炼铁厂通过安装在2500 m3高炉喷煤仪表系统中的雷达料位计、超声波料位计,使操作者可以方便快捷、连续测量物位,与现在大量使用的基于射线穿透能力而显示物位的仪器相比,具有使用安全、安装方便、维护量小等优点,为生产安全、稳定、顺行提供了有力的料位测量保障.     

KNF型场效应料位计在武钢高炉皮带机上的应用

KNF型场效应料位计采用了对波阻抗进行动态测量的原理，从理论上和实践中解决了传统料位计的不足之处，提高了测量灵敏度与抗干扰能力。武钢炼铁厂采用了KNF场效应料位计来对皮带机上各处中间中转小仓的料位进行监测，有效地避免了堵料事故，保证了返矿皮带与运料皮带的正常运转和工作秩序，为高炉稳产、高产、优质、低耗提供了可靠的保障，取得了较理想的效果。     

微波料位计在矿槽上的应用

本文介绍了一种微波料位计的工作原理和组成,及其在高炉矿槽上的应用,基本上解决了连续测量料位的难题,取得了满意结果,并且提出了今后努力的方向。     

韶钢气烧石灰竖窑料位探测技术的改进实践

介绍了韶钢焙烧厂气烧石灰竖窑料位的测定采用手拉探尺、激光料位计和机械自动探尺的应用情况,分析了3种料位探尺的特点及机械式自动探尺的应用效果。     

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.     

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.     

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)