问题 问答题 简答题

小型空分设备分馏塔加温吹除中应注意哪些问题?

答案

参考答案:

1)空压机应同正常运转一样供给冷却水,不允许采用关小冷却水来提高加温气体的温度,并要及时吹除油水分离器;

2)纯化器要及时切换、再生,并为启动做好准备;

3)加温中要注意检查所有液面计、压力表、接头和分析阀是否通气;

4)加热炉中的加热水要及时补充;

5)吹除时要注意各部位压力不得大于工作压力。在高压、中压吹除过程中,身体不准对准气体排出口。检查气体中有无杂质时应戴上手套。要注意气量大小及声音是否正常。带有乙炔吸附器的设备,在吹除中压时要特别注意通过乙炔吸附器的气量不能太大。故在拉出节-2阀阀杆时,必须先拉出节-3、节-4阀阀杆,不能只单独拉出节-2阀阀杆进行吹除。

完形填空
完形填空。
     Mary and   1   grandmother went shopping this morning. They went to the shopping centre   2   bus.
First, they   3   some food in the supermarket. Then they went to the   4   floor to buy a T-shirt. After
that, Mary wanted to buy a doll   5   the fourth floor but her grandmother wanted to buy a book   6  
cooking. They said “Goodbye”   7   each other. Five minutes later, Mary went to the bookshop but her
grandmother  8   there. Mary looked for her grandmother everywhere. At last, she   9   her grandmother
in the fast food restaurant. She   10   a cup of coffee there. How naughty?
( )1. A. she          
( )2. A. on          
( )3. A. buy          
( )4. A. second      
( )5. A. in          
( )6. A. about        
( )7. A. with        
( )8. A. is          
( )9. A. looked for  
( )10. A. was drinking 
B. her        
B. for        
B. buys        
B. twice      
B. on          
B. with        
B. to          
B. was        
B. found      
B. is drinking     
C. hers    
C. with    
C. bought  
C. two      
C. at      
C. to      
C. for      
C. isn't    
C. look for    
C. drinks  
D. his      
D. by      
D. buying  
D. twoth    
D. to      
D. of      
D. on      
D. wasn't  
D. find    
D. drank                                
单项选择题