M251S型燃气轮机功率急降故障分析与处理

介绍了天铁动力厂燃气蒸汽联合循环发电机组(简称CCPP)的M251S型燃气轮机频繁发生"功率急降跳机"故障的原因分析及解决过程。对燃气轮机负荷、转速、煤气压力等参数的综合分析显示,煤压机工作不良是造成燃气轮机功率急降的原因。通过对煤气热值、煤压机效率、负荷变动速率等因素进行综合调整,燃气轮机负荷逐步提高到正常水平,没有再发生"功率急降跳机"故障。     

阀门流量特性曲线对机组负荷的影响

介绍了在运行过程中出现的阀门流量特性曲线问题导致机组负荷波动的情况.分析了负荷波动的原因。认为在DEH系统中,如果阀门特性曲线在设定中存在偏差,将对机组的协调控制产生很大影响,甚至使机组负荷出现波动。     

基于微速度调节的负荷平衡在铜热轧中的应用

对于采用独立传动的铜热轧机组,在轧制过程中上下辊负荷分配不平衡的问题,采用基于微速度调节的负荷平衡系统进行负荷调节,同时进行必要的轧制速度控制。微速度调节负荷平衡系统引入铜热轧机组控制系统后,系统运行正常,解决了铜热轧上下辊负荷分配不均的问题,降低了设备故障率,使生产更加稳定可靠。     

25 MW背压式汽轮发电机组控制系统的改造

介绍了本钢发电厂原25 MW背压式汽轮发电机组存在调速系统稳定性差、波动大等问题,对机组进行了DEH改造,解决了机组负荷波动问题,提高了机组运行的安全性、稳定性。     

锅炉给煤控制系统的投运与改进

马钢热电总厂12#机组由于锅炉落煤管易堵和给煤控制部分问题,造成无法提升和稳定机组负荷。针对以上两个方面进行了相应整改,彻底解决了影响机组满负荷稳定运行问题。     

供热汽轮机调速系统卡涩、负荷突变的解决措施

凌钢热电厂50MW单抽供热机组自投运以来,一直未能正常运行,调速系统存在卡涩、负荷自动滑动的问题,而且突增、突减现象频繁发生,有时出现大幅度的负荷摆动,调压器投不上,严重影响机组的安全运行。针对上述问题,采取了具体解决措施,运行实践证明,所有问题均得到解决。     

优化M251S燃机燃烧、稳定机组运行

介绍了邯钢M251S燃机针对高炉煤气热值变化造成机组运行不稳问题的分析和处理。分别从燃料及热值的调节控制入手,减少了机组甩负荷的发生,保证了机组的安全稳定高效运行     

一种直供电系统中各发电机组的协调控制方法

提出了一种大电源向大负荷直供电系统中各发电机组的协调控制方法,选择机组最佳的控制模式,在最佳控制模式下,通过实验依据机组负荷响应时间短、负荷变化率快的原则确定第一、二、三调频机组,设置不同调频机组的参数。这样避免了大电源向大负荷直供电系统中机组调频匹配不一致导致电网不稳定的现象发生,达到机组顺序动作、多级防护、减少电网波动次数和溃网的风险。     

90t/h干熄焦发电机组推力瓦温过高故障处理

新钢第一动力厂90 t/h干熄焦发电机组自安装投入运行以来,由于机组带一半负荷时汽轮机推力瓦的温度就会超过报警值,使机组一直都不能在正常负荷下运行。针对这一问题,通过分析找出了故障原因,并采取了熔孔补焊,车削铜堵头,将瓦块与推力盘互研刮直至瓦块工作面接触点在65%以上的措施,现已使该机组可以满负荷运行。     

安钢干熄焦汽轮机调节系统及伺服机构改造

针对安钢干熄焦汽轮机调节系统因负荷波动恶化而低负荷运行的问题进行了分析,提出了改造方案并实施.经过改造投运后,该机组运行平稳,为安钢的干熄焦生产、余热发电起到了重要作用.     

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。     

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。     

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.     

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.