问题 问答题 简答题

锅炉运行调整中降低排烟温度的具体方法有?

答案

参考答案:

1.稳定燃烧,保持汽温汽压在额定范围内。

2.尽力消除制粉系统及炉本体各处漏风。

3.保持正常的炉膛负压,炉膛压力过负会使锅炉漏风加大。

4.保持合适的燃烧风量,保证氧量在正常范围内,特别是风量不能过大。

5.加强一二次风的配合,风粉的配合,一次风压不宜过大。

6.尽量多投入下排粉嘴,下排二次风可开小上排二次风可开大些,以降低火焰中心。

7.及时清除锅炉各处结焦结渣,并进行定期吹灰。

8.保证省煤器附近声波吹灰器的可靠性,并对空气预热器的堵塞及时进行消除。

9.按规定进行定期排污连续排污,以保证给水品质合格,可减少热阻,降低排烟温度。

10.保证合格的煤粉细度,煤粉可适当磨制细些。

11.保持制粉系统的最大出力运行,尽量少启用制粉系统或避免倒换制粉系统。

12保证电除尘和省煤器卸灰机的可靠和完整性,发现缺陷及时处理。

单项选择题

A businessman must keep records of the money he takes in and the money he spends. The work of keeping such records is called bookkeeping. The work of deciding how the records should be set up is called accounting. An accountant also finds out, by studying the records, whether or not a business is doing well. The accountant must know many things about the business.
Suppose a man owns a small clothing store, he keeps records that show that he spent money for newspaper advertising and for suits, shirts, shoes, and neckties to sell to his customers. He had to pay a young man to help him in the store. He also paid rent and had other expenses.
At the end of the year, he must take an inventory. That is, he counts how many pieces of clothing he has on hand. Then he must find out exactly how many he sold, how much money he took in, and how much money he spent in running the business. If he took in more than he spent, he made a profit for the year. If he spent more than he took in, he suffered a loss. He depends on his store accounting records to get all this information.
The owner of a small clothing store can keep records without much trouble. But a big oil company or a big bank has many difficult accounting problems. The company must know how much money is to be paid by its debtors and how much it owes other companies for supplies. It must know how much it has lost in depreciation, or wear and tear of its equipment. All of this information must be kept in the company’s accounts. Big companies employ many accountants.
After a company’s accountants finish their yearly count, their work must be officially examined. Experts from outside company double-check the records to be sure the accounts are correct.

In big companies, after the accountants finish the yearly count, ______.

A.the work will be well done
B.no one will check it
C.the records will be finished
D.experts will check the records

单项选择题