问题 问答题 简答题

如果离子交换器逆流再生时,进酸、进碱发生困难讲述的原因是什么?模拟操作如何处理?

答案

参考答案:

进酸、进碱发生困难的原因是:

1.离子交换器的背压过高。

2.排酸、排碱装置有堵塞现象。

3.离子交换器再生时本体阀门失灵,再生液串到另外一台交换器去。

4.加酸、加碱喷射器损坏,或是入口水压力太低,出口水压力也低。

5.自加酸、加碱喷射器至酸、碱计量器这段管路有泄漏,造成空气进入喷射器内。

处理方法:

1.检查离子交换器保持的背压≯O.05MPa

2.检查并及时排除排酸排碱装置的堵塞现象。

3.在再生过程中认真检查各台离子交换器阀门的开关情况,防止失灵或关闭不严。

4.联系生产调度安排检修酸、碱喷射器,使其工作恢复正常,或减小向外界的送水量,以提高喷射器入口水压力。

阅读理解

Last Sunday, I waked into the house in the afternoon to find my brother rushing around in a hurry. As soon as I took my coat off, my little brother placed a bunch of papers in my hands and asked me to fold them up so they could fit into an envelope as quickly as possible. He said it needed to get done quickly before it turned dark.

I was a little surprised that something could be so urgent on a Sunday. It wasn’t until I was halfway through that I actually looked at what I was folding. After I read it, it put the biggest smile on my face. It was a lovely letter to all the residents (居民)in my neighborhood. My brother was asking everyone to let him know if anyone needed help. He left his contact information and said that anyone that needed help should get in touch with him and he would figure something out. He also asked people to get in touch if they were able to help out.

London received an unusual amount of snow last week, and the city was completely under- prepared for it. So it was quite difficult to get anywhere. Only the major roads had been cleared, and smaller roads and pavements could be quite treacherous. There are a good number of old people in our little community. So my brother thought that the snow may have posed (造成)some difficulty for some of them, particularly because we live on a hill.

A few elderly people got in touch with him asking for help for things they needed. One of them was especially grateful because his caregiver couldn’t make it. To our surprise, he got more responses from people offering to help. Then he received help from people who wanted to help. Everyone was really touched and wrote to my brother wonderful email. One of our neighbors wrote email saying that although she wasn’t able to help, she was “very proud of having a neighbor like him who puts other people’s interests first.”

小题1:The author’s brother wrote the letter to _______.

A.ask for help from his neighbors

B.give a hand to those in need of help

C.require his neighbors to clear the snow

D.raise money for the old people in his community小题2:What can we learn from the text?

A.Few people were willing to help out.

B.The snow was unexpectedly heavy.

C.Most residents in the community are elderly people.

D.The community was completely cut off from the outside world.小题3:The underlined word “treacherous” in Paragraph 3 probably means “_______”.

A.dirty

B.dangerous

C.safe

D.crowded小题4: One of their neighbors sent email to the author’s brother to ________.

A.express thanks

B.lend a hand

C.show appreciation

D.ask for help

单项选择题