DF-144型蜂窝式电除尘器设计简介

武钢连铸厂从西德引进三台"蜂窝式"电除尘器,原系用于连铸厂火焰清理机烟气除尘.现将该设备移植应用于高炉煤气清洗中,完成了DF-144型蜂窝式电除尘器的设计.蜂窝式电除尘器的主要特点是:沉淀极为蜂窝形结构,通过气体的有效截面积大,约占60-70%左右,而一般用来清洗高炉煤气的管式电除尘器仅～40%左右;蜂窝式电除尘器的除尘效率较高(>95%以上),高于现有的板式电除尘器,相当于除尘效率较好的管式电除尘器.     

转炉煤气节能减排的几种技术措施

介绍了转炉煤气干湿法除尘现状.阐述了提高转炉煤气节能减排的干湿法技术措施.其中,湿法除尘装置和技术改进有塔-文结构除尘装置和近期研发的布袋除尘装置,前者包括:新一代一塔式煤气湿法除尘装置,塔-文分装式煤气湿法除尘装置,以及新型塔-文分装式煤气湿法除尘装置.干法除尘技术改进包括:转炉煤气LT干法电除尘和转炉煤气高温袋式除尘系统.     

高炉煤气干法电除尘的研究

１前言高炉煤气干法净化和湿法净化相比，不仅能简化工艺系统，合理利用煤气显热，提高煤气热效率，而且从根本上解决了二次水污染及污泥的处理问题。此外对于具有顶压发电设备的高炉，可增加发电能力。高炉煤气干法净化方法有电除尘和布袋除尘两种，由于我国高炉炉顶煤气温度普遍较高（一般为２８０～３２０℃），而目前布袋除尘器的致命弱点是工作温度不能超过２００℃，加上其运行、维护工作量很大，难以推广。而电除尘器不仅除尘效率高，运行维护方便，并且耐温可达３５０～４００℃，因此干法电除尘器用来净化回收高炉煤气越来越受到人…     

转炉电除尘高频电源改造

转炉电除尘作为熔炼车间转炉排烟系统重要的设备之一,属于高耗能的设备。在当今可持续发展的大环境下,其工作状况的好坏,对整个排烟系统有着重要影响。为了达到更高的除尘效率,皆采取各种措施和新技术,就是为了减少烟尘排放,减少能耗。大功率高频电源是新一代电除尘器供电装置,与目前使用的工频电源相比,可以提高电除尘器的收尘效率。     

湿式电除尘器在转炉湿法除尘系统改造中的应用

针对目前国内大多数转炉仍采用湿法除尘系统法回收转炉煤气的现状,分析了其除尘机理,提出了在现有的湿法除尘系统中嵌入湿式电除尘器的改造方案,解决了原有湿法除尘系统进一步提高除尘效率与能耗之间的矛盾,实现转炉一次烟气的超洁净排放。     

浅议高炉煤气加热对焦炉生产的影响

介绍了天铁集团焦化厂利用高炉煤气对焦炉进行加热的情况，重点分析了当高炉煤气温度由25℃-35℃上升到45℃-60℃后对焦炉生产的不利影响，采取了电除尘水洗涤措施降低高炉煤气温度，使焦炉的加热系统正常运行。     

转炉烟气超低排放复合技术的研究与应用

针对转炉一次除尘原工艺采用双文三脱湿式除尘技术,放散烟囱粉尘排放浓度80~100 mg/m3,环保指标大幅度超标的问题,提出在保留已有除尘工艺的基础上嵌入湿式电除尘装置,并设置安全防护装置、煤气排水安全装置,形成具有本质安全型超低排放复合技术,实现转炉烟气粉尘排放浓度10 mg/m3的极限技术指标。     

单光路激光气体分析仪在转炉煤气回收中的应用

针对转炉煤气回收柜前、干法除尘工艺中电除尘装置后煤气浓度分析的重要性和目前分析系统的不足,结合冶金行业大力推行节能减排、绿色炼钢的可持续发展模式,介绍济南钢铁股份有限公司第三炼钢厂新炼钢转炉的煤气浓度分析仪,详细说明激光分析仪工作原理,重点介绍单光路激光气体分析仪在转炉干法除尘中的应用问题。实践证明激光分析仪能够满足在转炉煤气回收利用中煤气浓度的监测功能要求。     

干式除尘转炉双渣工艺生产实践

针对干式除尘转炉冶炼终点高拉碳的技术难题,河钢集团宣钢公司创新了干式除尘转炉双渣工艺。在双渣操作倒渣完成后,利用二次下枪并手动将半流量供氧时间由90 s延长到120 s,分析炉气成分,确认CO和O_2含量避开泄爆区后,逐步将氧流量提高到正常值。过程枪位采用低枪位吹炼,终点按所炼钢种终点要求进行控制。新工艺很好地解决了干式除尘转炉双渣高拉碳的难题,同时又避免了电除尘器发生泄爆。为应用转炉煤气干法除尘转炉冶炼优质品种钢提供了借鉴。     

首钢大型高炉布袋除尘系统煤气温度的控制

介绍了在炼铁高炉煤气布袋除尘系统中,调节荒煤气温度来适应布袋除尘器布袋材质的许用温度的一项新技术。该技术采用热管做传热元件,并用水做降温介质,用管网蒸汽做升温介质,利用水的相变调节煤气温度。     

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。     

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.     

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。     

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。     

2008年中国电解金属锰发展态势浅析

对中国电解金属锰发展的市场态势、价格行情以及原材料供应情况作了初步分析,提出我国电解金属锰行业挑战与机遇并存,只要抓住机遇、迎接挑战、夯实基础、科技创新,电解金属锰行业前景将会更加光明。     

Replication of dimensions of locus of control.

Employed 120 male and 113 female undergraduates in a replication of H. L. Mirels's (see record 1970-10386-001) study which found 2 factors in analyzing responses to 23 items on Rotter's Internal-External Control Scale. The same polar dimensions of "luck" as the arbiter of life events as opposed to personal control were found as well as a 2nd dimension of degree of control over political and social institutions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)