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【判断题】
目前大多数电厂中的冷却水系统均采用闭式循环,故系统内的水不会减少,也不需要补水
A. 对
B. 错
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答案
B
解析
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【判断题】
离心泵正常运行中轴承钨金瓦不超过温度80℃,滚珠轴承不超过100℃
A. 对
B. 错
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水塔的蒸发量只与机组的负荷大小有关
A. 对
B. 错
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机组运行中,当循环泵突然掉闸后,凝汽器水侧中的水不流动,对保护凝汽器铜管最有利
A. 对
B. 错
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循环水允许的浓缩倍率越大节水效果越明显
A. 对
B. 错
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循环水管道由于工作温度低,其热伸长值较小,依靠管道本身的弹性压缩即可作为热伸长的补偿
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汽轮机停机后真空到零,如果凝结器水位不高可以马上停止循环水泵运行
A. 对
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抽气器的任务是将漏入凝汽器内的空气和蒸汽中所含的不凝结气体连续抽出,保持凝汽器在高度真空下运行
A. 对
B. 错
【判断题】
凝汽器的作用是建立并保持真空
A. 对
B. 错
【判断题】
凝汽器端差是指汽轮机排汽压力下的饱和温度与循环冷却水出口温度之差
A. 对
B. 错
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凝汽器在正常运行中有除氧作用,从而提高凝结水质量
A. 对
B. 错
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汽机排汽在凝结器内凝结过程可以近似看作变压、变温凝结放热过程
A. 对
B. 错
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汽轮机的排汽在凝结器中凝结成水,只放出汽化潜热,但温度不变
A. 对
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汽轮机热态启动时凝汽器真空适当保持低一些
A. 对
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汽轮机运行中,凝汽器入口循环水水压升高,则凝汽器真空升高
A. 对
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汽轮机运行中当凝汽器管板脏污时,真空下降,排汽温度升高,循环水出入口温差减小
A. 对
B. 错
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提高凝汽器真空,可提高机组运行经济性, 但是,凝汽器的真空不是提高得越多越好
A. 对
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运行中不停用凝汽器进行凝汽器冷却水管冲洗的唯一方法是反冲洗法
A. 对
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运行中凝汽器进行半边隔离时,应先隔离水侧,然后关闭空气门
A. 对
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凝汽器的端差是指凝汽器排汽温度与凝汽器循环水进口温度之差
A. 对
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凝汽系统的投用工作应在锅炉点火后完成
A. 对
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凝汽器的空气冷却区可以减轻抽气器的负担,改善抽汽效果
A. 对
B. 错
【判断题】
凝汽器运行中,当不锈钢管结垢时,将导致循环水传热下降
A. 对
B. 错
【判断题】
汽轮机正常运行中凝汽器的真空不是靠真空泵来建立的
A. 对
B. 错
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凝汽器水位过高的明显标志是水位显示高凝结水过冷度大
A. 对
B. 错
【判断题】
凝汽设备主要由凝汽器、凝结水泵、抽气器等组成
A. 对
B. 错
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凡是经过净化处理的水都可以作为电厂的补给水
A. 对
B. 错
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凝结水泵安装在热水井下面0.5~0.8m处的目的是防止水泵汽化
A. 对
B. 错
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提高蒸汽品质应从提高凝结水、补给水的品质着手
A. 对
B. 错
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为保证凝结水泵在高度真空下工作,需用生水密封盘根
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B. 错
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一般每台汽轮机均配有两台凝结水泵,每台凝结水泵的出力都必须大于或等于凝汽器最大负荷时的凝结水量
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B. 错
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备用凝结水泵的出口电动门应处于关闭状态
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B. 错
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凝结水的精处理设备严禁退出运行,在凝结器铜管发生泄漏凝结水品质超标时,应及时查找、堵漏
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凝结水泵水封环的作用是防止泵内的水漏出
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凝结水中含有氧等气体是造成过冷却的一个原因
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当除氧给水中含氧量增大时,可开大除氧器排汽阀门来降低含氧量
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按传热方式划分,除氧器属于混合式加热器
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除氧器的作用就是除去锅炉给水中的氧气
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( ) 34. Judy Foreman copied down the phrase because she ___ . A. thought it was beautifully written B. wanted to know what it really meant C. decided to write it on a warehouse wall D. wanted her husband to put it up in the classroom
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