【多选题】
超高压蒸汽发生系统管线化学清洗过程中,要分别进行酸洗和碱洗,其中不是碱洗的目的是___。
A. 除去泥砂
B. 除去管壁上附着的铁锈
C. 除去防锈油(脂)
D. 除去焊渣等机械杂质
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相关试题
【多选题】
下列各项中属于急冷区日常分析项目的有___。
A. 工艺水pH值
B. 急冷水pH值
C. 稀释蒸汽汽包排污pH值
D. 稀释蒸汽凝液pH值
【多选题】
正常生产时,裂解单元废渣的来源有___。
A. 烧焦罐焦粒
B. 急冷油循环泵入口过滤器焦粒
C. 急冷油循环泵出口过滤器焦粒
D. (减粘后)裂解燃料油采出泵入口过滤器焦粒
【多选题】
减粘塔依靠___作用,将急冷油中最重的组分脱离出来。
A. 汽提
B. 重力沉降
C. 离心沉降
D. 冷凝
【多选题】
安全阀按照开启度分类,可分为___。
A. 全启式
B. 微启式
C. 中启式
D. 敞开式
【多选题】
关于裂解炉的维护内容,下列说法正确的是___。
A. 烟气横跨温度不得超过设计指标的0℃以上
B. 炉出口压力不得超过设计值
C. 裂解炉炉膛应保持在一定的负压下运行,不允许正压操作
D. 烟气含氧量应维持在2~3%之间,并保证烟囱不冒黑烟
【多选题】
蒸汽透平润滑油系统在启动透平前,正确的状态有___。
A. 润滑油辅助油泵已经启动,润滑油压力正常
B. 润滑油冷却器已经正常投用
C. 两台润滑油过滤器一台已经正常投用,另一台已经充液备用
D. 润滑油油箱满液位
【多选题】
设置汽油分馏塔中段回流的目的有___。
A. 提高汽油分馏塔的热负荷
B. 降低汽油分馏塔的热负荷
C. 提高汽油分馏塔的处理能力
D. 降低汽油分馏塔的处理能力
【多选题】
当裂解炉烧嘴出现脱火现象时,正确的调整手段有___。
A. 适当加大燃料气量
B. 关小烧嘴风门
C. 适当降低燃料气压力
D. 开大烧嘴风门
【多选题】
可以有效延长裂解炉运行周期的方法包括___。
A. 提高稀释比
B. 降低COT
C. 降低进料量
D. 调整燃烧模型
【多选题】
联锁系统的输入信号可以是___。
A. 压力信号
B. 温度信号
C. 液位信号
D. 流量信号
【多选题】
安全阀按其工作原理可分为___。
A. 弹簧式
B. 重锤式
C. 杠杆式
D. 导向式
【多选题】
下列各项中,对结焦程度有影响的是___。
A. 稀释蒸汽流量
B. 原料种类
C. 炉出口温度
D. 炉管材质
【多选题】
下列各项中,可能会造成裂解炉排烟温度高的是___。
A. 对流段吹灰
B. 辐射段窥视孔漏风
C. 汽包排污过大
D. 烧嘴燃烧情况不佳
【多选题】
下列各项中,有利于降低急冷油粘度的调整方法是___。
A. 减小侧线采出量
B. 适当降低急冷器出口温度
C. 适当降低DS压力
D. 外接调质油
【多选题】
裂解炉辐射段炉管断裂时的紧急处理应该包括___。
A. 切断裂解炉原料供应
B. 停急冷油
C. 切大阀
D. 切断裂解炉燃料供应
【多选题】
因循环水水质不稳定而引起的常见故障有___。
A. 结垢故障
B. 腐蚀故障
C. 生物故障
D. 粘泥故障
【多选题】
我们现在常用的仪表精度等级为___。
A. 0.5;
B. 1;
C. 1.5;
D. 2.5
【多选题】
BFW水质不良引起的危害有___。
A. 设备结垢
B. 炉管结垢
C. 设备结垢
D. 蒸汽透平结垢
【多选题】
工艺水过滤器的工艺目的有___。
A. 过滤固体颗粒
B. 过滤溶解在水中的酸性组分
C. 分离水中的汽油等重质烃类
D. 拦截水中的钙镁等金属离子
【多选题】
BFW水质不良引起的危害有___。
A. 设备结垢
B. 炉管结垢
C. 设备结垢
D. 蒸汽透平结垢
【多选题】
工艺水过滤器的工艺目的有___。
A. 过滤固体颗粒
B. 过滤溶解在水中的酸性组分
C. 分离水中的汽油等重质烃类
D. 拦截水中的钙镁等金属离子
【多选题】
“三查四定”中的“四定”是指对检查出来的问题___。
A. 定任务
B. 定负责人
C. 定措施
D. 定时间、期限解决
【多选题】
下列分析项目中,通常采用自动在线分析仪表分析的有___。
A. 烟气氧含量
B. 烧焦气CO含量
C. 超高压蒸汽汽包连续排污磷酸根含量
D. 裂解气各组分含量
【多选题】
系统进行氮气置换时,要求___。
A. 系统内各调节阀打开
B. 系统内各调节阀关闭
C. 系统内各调节阀旁路打开
D. 系统内各调节阀旁路关闭
【多选题】
离心泵启动后,应注意___。
A. 电流表电流
B. 泵的转向
C. 出口压力
D. 泵体泄漏情况
【多选题】
安全阀的开启压力是根据___确定的。
A. 正常操作压力
B. 介质的物态
C. 安全阀的最大排放量
D. 安全阀的开启度
【多选题】
关于塔类设备的日常维护,下列说法正确的是___。
A. 塔器操作中允许超温但不能超压
B. 定时检查受压元件
C. 定时检查人孔、阀门和法兰等密封点的泄漏
D. 定时检查安全附件,应灵活可靠
【多选题】
下列各项中,对裂解炉废热锅炉发生严重内漏后,急冷系统主要工艺参数的变化趋势叙述正确的是___。
A. 汽油分馏塔顶温上升,釜温下降
B. 汽油分馏塔顶温下降,釜温上升
C. 急冷水塔塔顶温、釜温都上升
D. 汽油分急冷水塔顶温、釜温都下降
【多选题】
发现工艺水带油后,正确的处理方法有___。
A. 提高急冷水塔塔釜温度
B. 控制急冷水沉降槽中的油相液位,防止油相液位偏高
C. 将乳化的急冷水处理正常
D. 提高汽油分馏塔顶温
【多选题】
裂解炉发生燃料气低压联锁停车后,正确的处理方法包括___。
A. 关闭原料调节阀
B. 关闭各烧嘴考克和阀门
C. 调整烧嘴风门和烟道挡板,控制炉膛进风量
D. 降低DS量
【多选题】
裂解炉风机轴承温度偏高,可选择公用站所提供的___为其降温。
【多选题】
下列调节措施中能够降低裂解汽油干点的有___。
A. 增加侧线裂解柴油采出量
B. 减少侧线裂解柴油采出量
C. 增加塔顶汽油回流量
D. 减少塔顶汽油回流量
【多选题】
下列措施中,可以降低裂解炉烟气温度的有___。
A. 打开对流段窥视孔
B. 加大汽包排污量
C. 加大BFW的流量
D. 开大底部烧嘴风门
【多选题】
当裂解炉烧嘴出现回火现象时,正确的调整手段有___。
A. 适当加大燃料气量
B. 关小烧嘴风门
C. 适当降低燃料气量
D. 开大烧嘴风门
【多选题】
为了防止急冷水系统腐蚀,常加入的药剂有___。
A. NaOH
B. 消泡剂
C. 中和胺
D. 缓蚀剂
【多选题】
影响传热的主要因素有___。
A. 传热面积
B. 传热温差
C. 传热系数
D. 换热器的结构
【多选题】
下列属于电气火灾灭火器的是___
A. 干粉灭火器
B. CO2灭火器
C. 泡沫灭火器
D. 1211灭火器
【多选题】
芳烃可能发生的裂解反应有___。
A. 侧链断链反应
B. 侧链脱氢反应
C. 缩合反应
D. 岐化反应 .
【多选题】
正常生产时,急冷水沉降槽采出的裂解汽油经过压缩单元处理后送至贮罐,这样做的目的有___。
A. 保证裂解汽油闪点合格
B. 脱除其中的较轻组分
C. 脱除其中的较重组分
D. 保证储藏时的安全
推荐试题
【单选题】
Tom is a book lover. ______ likes reading very much.
A. He B. She C. You D. It
【单选题】
—May I listen to the music here, Mr. White?
—Sorry, you’d better it like that.
A. not to do B. not do to
C. dont do D. not do
【单选题】
3.—Did you have a good time at Lauras birthday party?
— Yes, indeed. Its several years ________ I enjoyed myself so much.
A. when B. before C. since D. that
【单选题】
4. —___________ is the Summer Palace from here?
About three kilometers away. You can take the No. 35 bus.
A. How long B. How far C. How often D. How much
【单选题】
5. I was looking for a birthday gift for my mother, but I couldnt find ______ suitable.
A. anything B. something C. nothing D. everything
【单选题】
6. A friend of my ____ and I are going to visit_______ next week.
A. father; Browns B. father's; Browns
C. father; the Browns D. father's; the Browns
【单选题】
7. She ______ very hard since she came to our school.
A. studies B. has studied C. is studying D. studied
【单选题】
8. — Who will send you to the new school, your mom or your dad?
— _______. Ill go there by myself.
A. Both B. Either C. Neither D. None
【单选题】
9.—Well do what we can ____English well this term.
—It’s high time for you to work hard.
A. study B.to study C. be studied D. be studying
【单选题】
10. —I’m going to Flower Bookstore. Could you tell me ______?
— Sorry, I don’t know. I’m new here.
A. where it is B. where was it C. where is it D. where it was
【单选题】
11. How do you like the dishes, Eric?
— Fantastic! Nothing tastes ________.
A. nice B. better C. terrible D. worse
【单选题】
12. ______ Lin Feng has to work late, she always wears a smile on her face.
A. Because B. If C. Until D. Though
【单选题】
13.You can save money _______ you buy cheaper things.
A. before B. unless C. if D. until
【单选题】
14. We will have a _________ holiday after the exam.
A. two-month B. two month’s C. two month D. two-months
【单选题】
15. —We will build an underground in Xuzhou before 2015.
— Wow, _______! Will it pass our place?
A. what an excited news B. how excited the news is
C. what exciting news D. how exciting
【单选题】
16. — Emily, here’s a dictionary.I hope it will help you in some way.
— Thank you.It’s ________ what I need.
A. almost B. still C. only D. just
【单选题】
17. —Oh.I’m hungry.Mum, can I have the hamburger on the plate?
—No.It tastes .
A. terribly B. terrible C. good D. well
【单选题】
18. —We can invite our teachers to the farewell party next Saturday.
—Yes, ______? I’ll call them at once.
A. what for B. what C. why not D. why
【单选题】
19.You can ________ ask the old man to move away to any other place because he has lived ________ here for at least sixty years.
A. hardly; alone B. hard; alone
C. hardly; lonely D. hardly; lonely
【单选题】
20.—I’m going back to see my grandparents this weekend.
—________.
A. It’s very nice of you B. You’d better hurry
C. Say goodbye to them D. Give my best wishes to them
【单选题】
21.—Why not take ____ umbrella with the sign “Made in China”? It is useful.
—What _______ good advice it is!
A. an; a B. a; a C. an; \ D. \; a
【单选题】
22. —Do you know the boy________ is sitting next to Peter?
— Yes. He is Peter’s friend. They are celebrating his ________ birthday.
A. who; ninth B. that; ninth C. /; ninth D. which; ninth
【单选题】
23. It was dark, ______ I couldnt see what was happening.
A. or B. though C. but D. so
【单选题】
24.—You can use MSN to talk with Vivien on the Internet.
—I know. But can you tell me ________?
A. what I can use it B. when I can use it
C. why can I use it D. how can I use it
【单选题】
25. _______ are you going to the School Uniform Exhibition, Amy ?
To learn about different styles of school uniform.
A. What B. Where C. Which D. Why
【单选题】
( ) 26. Where does the writer of "The little Prince" come from?
A.England. B.France. C.America. D.China.
【单选题】
( ) 27. What does the prince do after the fox tells him a secret?
A.He cares more about a flower and a sheep.
B.He meets many more strange adults on other planets.
C.He realizes his love for the rose and he goes back to his planet.
D.He discovers interesting things such as a snake, other roses and a fox
【单选题】
( ) 28. What does "The little Prince" mainly talk about? It' s about _________.
A.the adult world B.the planet B -612
C.a rose and a fox D.the adventure of a young prince
【单选题】
( ) 29. What is the writer's main purpose(目的)in writing this passage?
A.To tell the readers his life story.
B.To tell people what kind of person his father was.
C.To tell the readers what present he got from his father.
D. To let people know how poor he was.
【单选题】
( ) 30. Why did the father not ask his son not to do this and do that?
A.Because he felt quite confident of his son.
B.Because he was born from a poor family.
C.Because he was a man of few words.
D.Because he didn't want to be much too strict with his son.
【单选题】
( ) 31. What would someone learn from this passage?
A.How to live by oneself. B.How to stand on one's own feet.
C.What a good father should do. D.What the self-important is like.
【单选题】
( ) 32. What may be the proper Chinese for the underlined part in the passage?
A.闲暇时光 B.学费 C.精神空虚 D.经济不足
【单选题】
( ) 33. Why did Natalie Smith pay for the six cars behind her?
A. She had seven tickets.
B. She hoped to please others.
C. She knew the car drivers well.
D. She wanted to show kindness.
【单选题】
( ) 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
【单选题】
( ) 35. Who came up with the phrase according to the passage?
A. Judy Foreman. B. Natalie Smith. C. Anne Herbert D. Alice Johnson.
【单选题】
( ) 36. What can we infer from the last paragraph?
A. People should practice random kindness to those in need.
B. People who receive kindness are likely to offer it to others.
C. People should practice random kindness to strangers they meet.
D. People who receive kindness are likely to pay it back to the giver.
【单选题】
( ) 37.The greatest river for navigation is ___________.
A. the Nile B. the Amazon C. the Mekong D. the Mississippi
【单选题】
( ) 38. From a dam, people can use the water for ___________.
A. keeping the rivers clean B. only making electricity
C. irrigation and making electricity D. washing clothes
【单选题】
( ) 39. The water in the river is polluted because of _____________.
A. people's drinking water too much B. people's swimming in the river too much
C. chemicals and other materials D. people's building a dam across a river
【单选题】
( ) 40. The best title of the passage is ___________.
A. Rivers in Cities B. The importance of Rivers
C. Transportation D. Natural Resources