问题 问答题 简答题

过热器损坏有哪些现象?如何处理?

答案

参考答案:过热器损坏现象:过热器区有漏汽响声;蒸汽流量不正常的小于给水流量;炉膛负压减小或变正压,严重时人孔及烟道不严密处喷汽和冒汽;过热器后烟气温度下降;过热器温度、排烟温度升高;引风机负荷增加,电流增高。过热器损坏处理:

(1)过热器轻微泄漏,可适当降低负荷,不致引起事故扩大时,可维持短时间运行,待备用锅炉投入运行后再停炉检修。

(2)过热器严重损坏时,不能维持汽温、汽压时必须立即停炉。

(3)停炉后,引风机继续运行,以排除炉内的烟气和蒸汽,排尽后,停止引风机。

阅读理解

阅读与表达(共5小题,每小题2分)

Wang Xiaojun is 12 years old. He lives in the country in Hubei Province. Today is his birthday. His parents prepare a nice dinner for him, but the boy says, “I won’t have the dinner because after the dinner, today is over, and parents are leaving for Shenzhen tomorrow. I don’t want to let them go.”

It is the first birthday that Wang Xiaojun is spending with his parents stayed in Shenzhen and worked to make money. They haven’t seen their son for three years. Tomorrow they have to leave home to go to Shenzhen.

Wang is not the only stay-at-home child. In the country of China, there are more than 20 million children staying at home without their parents. Stay-at-home children face a lot of problems. Many of them stay with their grandparents. They get less care from parents. They often feel lonely. Some of them don’t study well because their parents can’t help them with their study.

The Chinese government now cares about the children very much and is trying to solve their problems.

小题1:Is it Wang Xiaojun’s first birthday?

                                                            

小题2:There are many stay-at-home children in the country of China, aren’t there?

                                                            

小题3:Why don’t some of the stay-at-home students study well?

                                                            

小题4:How long haven’t Wang Xiaojun seen his parents?

                                                            

小题5:In China,how many children staying at home without their parents?

                                                           

填空题