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【单选题】
引蒸汽的时候,由于高温蒸汽与管道中的冷凝水接触,冷凝水升温,发生___,体积迅速膨胀,出现“汽锤”,使管道猛烈抖动,称为“水击”。
A. 化学反应
B. 相变
C. 爆炸
D. 冷凝
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答案
B
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【单选题】
蒸汽试压时要注意低点___。
A. 排凝
B. 放气
C. 关闭
D. 保护
【单选题】
下列不是系统引氮气时所应注意的点是___。
A. 引氮气时注意安全,防止窒息
B. 氮气进装置后,凡需进入容器内必须要进行氧含量分析
C. 与氮气管线相连的其他工艺介质管线、容器用盲板或双阀隔离,双阀之间的放空打开
D. 引氮气前系统需进行干燥
【单选题】
下列关于低压系统吹扫的说法不正确的是___。
A. 管线的吹扫原则上要顺流程走向,先副线,后主线,顺管线向下或水平吹扫,避免向上吹扫
B. 先对各塔、容器吹扫,再向外吹附属设备及管线
C. 从外往塔、容器内吹扫,则必须先对入塔、容器管线吹扫干净,并在入塔、容器处拆开法兰排污,吹扫干净后再将法兰复位
D. 吹扫流程中的调节阀、孔板及流量计等元件应拆除
【单选题】
吹扫控制阀时,应___。
A. 先扫正线,后扫副线
B. 先扫副线,后扫正线
C. 正、副线同时扫
D. 没有特别原则
【单选题】
新装置开车水冲洗使用___。
A. 新鲜水
B. 循环水
C. 除盐水
D. 除氧水
【单选题】
塔的吹扫结束的标志正确的是___。
A. 塔顶放空无物料气出来
B. 塔底液面计上放空无物料气出来
C. 塔底放空无物料气出来
D. 塔底液面计下放空无物料气出来
【单选题】
引循环水时将冷换设备的操作不正确得是___。
A. 冷换设备出口前的放空阀打开将管道和冷换设备内的空气赶走
B. 引循环越慢越好
C. 先引介质再引循环水
D. 先将循环水冷换设备中垃圾吹扫掉
【单选题】
循环水进装置温度一般不会低于___。
A. 40℃
B. 30℃
C. 生活用水温度
D. 气温
【单选题】
循环水由于循环水冷却器的___要求,比新鲜水要求高。
A. 冷却
B. 防腐防垢
C. 流速
D. 回用
【单选题】
净化风与非净化风的主要区别是___。
A. 温度
B. 脱水
C. 比重
D. 使用量
【单选题】
吹扫换热器时,应___。
A. 先扫正线,后扫副线
B. 先扫副线,后扫正线
C. 正、副线同时扫
D. 没有特别原则
【单选题】
酸性气带水对硫磺装置的影响,以下哪项不正确___。
A. 造成炉膛熄火
B. 系统压力升高
C. 增加设备腐蚀
D. 提高催化剂水解反应效果
【单选题】
以下___不是酸性气中的液相组分。
A. 氨
B. 胺液
C. 碱液
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【单选题】
蒸汽再沸器在投用时,为了防止出现“水锤”,___进行预热。
A. 略微开启进口阀门
B. 开足进口阀门
C. 略微开启排凝阀门
D. 开足排凝阀门
【单选题】
进入反应炉的酸性气主要成分是___。
A. 硫化氢、氨、烃
B. 硫化氢、二氧化硫、烃
C. 硫化氢、二氧化碳、氨
D. 硫化氢、烃
【单选题】
在开车过程中,蒸汽重沸器在投用时,引物料的速度___比较好。
A. 越快越好
B. 先快后慢
C. 越慢越好
D. 先慢后快
【单选题】
现场玻璃板液面与仪表显示液位一致是因为仪表液位与现场液位___。
A. 手阀位置相同
B. 同一根引出管
C. 材质相同
D. 介质密度相同
【单选题】
调节阀是通过改变___来改变阀的阻力系数,达到调节流量的目的。
A. 阀芯行程
B. 信号压力的大小
C. 电信号的大小
D. 以上全部
【单选题】
调节阀在输送粘性很大的介质时,可能造成阀___。
A. 可调比变小
B. 无信号
C. 单方向动作时迟钝
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【单选题】
溶剂发泡时,会有___现象。
A. 溶剂变成透明色
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C. 吸收塔压降增加
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【单选题】
停工过程中不得随地任意排放油品、瓦斯,排水沟地漏要疏通,___要封死盖严。
A. 放水管线
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【单选题】
停工时必须要有___与工作票才可以拆装盲板。
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B. 用火票
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D. 盲板清单
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吹扫酸性气管道的时间要连续___小时以上。
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【单选题】
玻璃板液面计是依据___原理工作的。
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【单选题】
快速切断阀是为了安全生产所装,因此当装置失风时阀应___,保证生产安全。
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B. 全关
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【单选题】
快速切断阀改手动时候,应有___现象。
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B. 阀自动全关
C. 发出气缸泄压声音
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【单选题】
___不是瓦斯带水的工艺现象。
A. 炉膛内压力下降
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下面不是燃料气停的现象是___。
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硫磺的自燃点为___℃。
A. 123
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D. 248
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硫磺着火最好采用___。
A. 隔离法
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C. 冷却法
D. 保护法
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仪表风中断后,风开阀现场如何进行操作___。
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C. 由副线阀控制
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【单选题】
汽提产品液氨含H2S的量要___ppm。
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B. 小于5
C. 小于6
D. 小于7
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外排净化水的氨氮含量___ppm;硫化物含量( )ppm。
A. 小于50;10
B. 小于40;20
C. 小于50;20
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氨精制塔顶温度控制在___。
A. −10~8℃
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下列物质中,有游离态氮元素存在的是___。
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B. 液氨
C. 空气
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纯硫化氢在空气中达到___℃发生自燃。
A. 170
B. 220
C. 232
D. 260
【单选题】
下列___不属于硫化氢气体的性质。
A. 比空气轻
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循环水由于循环水冷却器的___要求,比新鲜水要求高。
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由于氨会与___有腐蚀作用,所以对氨介质不能采用一般压力表。
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B. 铜
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装置贫醇胺溶液从原料气中吸收酸性组分,并且 ___。
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is the first African-American winner of the Nobel Prize for Literature.
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Of the following writers, is Not a Nobel Prize winner.
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Of the following, is considered Herman Melville’s masterpiece.
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Of the following, is NOT Nathaniel Hawthorne’s work.
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is regarded as “the father of American literature”.
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Of the following writers, are from the Colonial and Revolutionary Periods.
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The National Day of the United States falls on .
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Of the following, is NOT among the three major radio and TV networks in America.
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is sold especially to the upper or upper-middle class and it has a reputation for its serious attitude and great bulk.
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Of the following universities, has NOT cultivated any American President yet.
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