问题 问答题 简答题

除氧器再生步骤?

答案

参考答案:

(1)反洗:用脱盐水对树脂进行反洗,打开下进水阀及上排水阀进行反洗,反洗到出清水为止,反洗干净后进行再生。

(2)配制联氨(也称水合肼)溶液:通过磁力泵把浓联氨抽到计量桶中,80%联氨每次用一桶(如40%的联氨则需两桶)配制到联氨箱中,用脱盐水稀释到一满箱,即成合格浓度的再生液。

(3)加联氨再生:开动联氨加药泵,打开除氧器进药阀及除氧器下排水阀,以小于除氧器正常流速1/2加药,边加药边排水,控制排放速度,使除氧罐始终保持0.05MPa压力。

(4)正洗:加完联氨溶液后,用两药箱脱盐水正洗。正洗水排放。

(5)熟化:正洗结束,关闭除氧器出口阀及进口阀,静止熟化8小时,熟化期间注意观察压力表,如超过0.2MPa,则打开放空阀放空。

(6)运行:熟化8小时后,除氧罐可投入运行,打开上进水阀及下出水阀,除氧器进入正常运行,此时除氧器可连续运行24小时左右。

(7)配制硫酸铜溶液:在硫酸铜药箱中加半箱脱盐水,称取9.5kg结晶硫酸铜加水溶化后倒入硫酸铜药箱中,然后放脱盐水到药箱满即成合格剂量合格浓度的硫酸铜溶液。

(8)加硫酸铜溶液,当除氧器运行16小时左右,需加硫酸铜溶液。开动硫酸铜加药泵,打开除氧器进药阀,把硫酸铜溶液打入除氧器中,此时流出的水仍为无氧水,不必排放,继续送出使用。加完硫酸铜后关闭进药阀,继续运行8小时左右,测量水中氧含量,超出额定值时停止运行,进行再生。

阅读理解

根据短文内容按要求完成任务。(共30分,每小题2分)

No one is born knowing how to study. You need to learn a few study skills and then practice them. Here are six ways of studying smartly.

Listen carefully in class. When you listen carefully in class and take good notes, you are starting learning carefully. Are you sitting next to a loud person? Is it hard to see the blackboard clearly? Tell your teacher or parents about this kind of problems.

Take food notes. Not sure how to take notes? Start by writing down what your teacher says or writes on the blackboard during class. Try your best to write clearly so you can read your notes later.

Plan ahead (提前作计划). It is bad to wait until Thursday night to study for Friday’s exam. You should plan ahead. Write down the date of your exam. You can plan what to do after school each day, and how much time to spend on each subject.

Break it up(拆开)。 When there’s a lot to study, it can help you to break things into units. If you have an exam on spelling words, break them up into five-word units and work on one or two different units each night.

Ask for help. Ask your teacher for help if you don’t understand something. If you’re at home, your mom or dad might be able to help.

Have a good sleep. A good sleep is good for your next day’s study.

小题1:How many ways to study smartly are there in the passage?

小题2:What is the first step(步骤) of starting learning and studying?

小题3:What could you do if you have a lot to study?

小题4:Who can you ask for help when you don’t understand something at school?

小题5:Do you think a good sleep is good for your next day’s study

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