问题 问答题 简答题

循环氢的作用是什么?为什么说压缩机是重整装置的心脏?(重整装置)

答案

参考答案:

重整循环氢的作用主要有三点:

⑴改善反应器内温度分布,起热载体作用;

⑵抑制生焦反应,保护催化剂活性寿命;

⑶稀释反应原料,使物料更均匀地分布于床层中。

由于循环压缩机能使氢气在系统中得以循环,发比人的心脏促使血液在人体循环一样,因此,人们都说循环压缩机就是重整装置的心脏,这种形容是很形象、很恰当的。一旦循环压机出现故障不能运转,系统含氢气体不再流动,催化剂将迅速结焦,催化剂活性和寿命就要下降,这是非常危险的。就像人的心脏停止跳动一样,必须采取紧急措施进行抢救,如采取停油、降温、灭火、停止注氯等。

阅读理解

阅读理解。

     Summer is almost over and school will start soon, Bill and his father go to a store for school things.

 They see all kinds of notebooks, rulers, pens and pencils. They also see this sign (招牌).

                                       The Light (灯) Writer

        Have a look at the new Light Writer pen.

        This kind of pen has a light in it.

        Now you can write in the dark (黑暗).

        You can have fun when you write.

        Light Writer pens come in three colors: black, blue and red.

        Anybody can afford our great LOW price of ONLY $1.59.

                                         BUY ONE TODAY!

1. Light Writer is the name of a kind of _____.

    A. book                

    B. sport                 

    C. pen

2. Why does Bill go to the store?

    A. He needs a new Light Writer.

    B. He needs to buy school things.

    C. He likes to go shopping.

3. The purpose (目的) of the sign is to_____.

    A. sell pens          

    B. sell lights                

    C. help kids have fun

4. What does the word "low"mean in Chinese?

    A. 浅的.            

    B. 矮的.                  

    C. 低的.

5. What can we know from the story?

    A. Bill wants to have fun when he writes.

    B. Bill makes the sign with his new pen.

    C. Bill and his father see a sign about a new pen at the store.

选择题