问题 问答题 简答题

水冷壁爆管的现象、处理。

答案

参考答案:

现象:

1>严重时,爆管处有明显的爆破声和喷汽声,炉膛负压变正,给水流量不正常的大于蒸汽流量,汽包水位迅速下降,难以维持水位,燃烧室内有泄漏响声;

2>如果爆管,炉膛压力急剧升高,孔洞及不严密处向外喷烟、汽水;

3>汽包压力、蒸汽流量、排烟温度下降,两侧烟温差增大;

4>烟道及引风机入口负压变小,引风机电流上升;

5>旋风分离器进、出口烟温下降,料腿回料温度低;

6>床压增大,床层压差增大,床料板结,流化不良,床温分布不均,底灰排放困难。

处理:

1>如发现泄漏,未发生MFT且能维持汽包正常水位时,降压,保持低负荷运行,汇报值长,申请停炉;

2>检查并注意损坏情况是否迅速扩大,密切监视水位,汽温,床温及底灰排出情况,调整炉膛负压、床压.视情况联系汽机增开给水泵;

3>燃烧不稳定及时投油助燃。投油前布袋除尘器走旁路。

4>若水冷壁严重损坏,发生MFT、锅炉已灭火或加强进水后难以维持汽包水位时应紧急停炉;

5>一次风维持在最小流化风量,加强排渣;

6>维持一台引风机运行,消除炉内蒸汽;

7>停炉时,布袋除尘器应切为旁路运行,防止泄漏物造成布袋堵塞或寿命降低;

8>停炉后,继续上水维持水位。如给水耗量太大,水位维持困难可停止上水。停止上水后,禁止开启省煤器再循环;

9>尽快将炉内床料排出炉膛,以防止床料结块;

10>待炉内水蒸汽基本消失后,停运引风机,开通烟道自然通风。

完形填空

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第二节 完形填空(共20小题;每小题1分,满分20分)

阅读下面短文,从短文后各题所给的四个选项(A、B、C、D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。

Before dinner my wife wanted me to go to the store to get some soft drinks. It seemed that this would be a good time to let my teenage daughter Holly get a little driving  36  . I drove her to the store and  37   my car with her, and then I came back home with my son. He spoke  38   of the car. I was a little proud, for it was the nicest car I had  39   owned.  40  , I said, “Guy, my heart is not  41   that car. I like it but it is just metal. It won’t last forever. Never set your heart on anything that is  42  .”

It was at that moment  43   I heard a noise on our street. My son went out and then he shouted, “Dad! Holly damaged your car.”

My heart  44   and my mind was flooded with conflicting thoughts. Was  45   hurt? Who else was involved? As I ran to the door, I heard a voice in my heart say: “ Here is a  46   to show Holly what you really love. She will never forget it.” Holly was not hurt  47  , but when I reached her, she was crying and saying over and over again, “Oh, Dad, I’m sorry. I know how much you love this car.” I held her in my arms.

Later that week a friend asked what happened to my car. I told her the whole  48  . Then she said, “That happened to me when I was a girl. After I  49   my Dad’s car, my father,  50  , knocked me to the ground and began to kick me.” Over forty years later she still felt the  51  . It was a deep wound on her soul.

I have repaired my car, but there are  52   some scratches (划痕) on it. Every day they  53  me of the really priceless things in my life. Every day it reminds me of what really  54   in my life. One day, when Holly thinks back on her life, I want her to know that I love her a thousand times more than any piece of  55  .

36.A. practice              B. exercise             C. training               D. lesson

37.A. gave                   B. left                   C. kept                    D. got

38.A. admiringly      B. proudly             C. deeply                 D. curiously

39.A. just                    B. already              C. even                      D. ever

40.A. Therefore            B. However           C. Otherwise              D. Besides

41.A. set up                  B. set aside            C. set on                     D. set down

42.A. temporary           B. metal                C. nice                       D. contemporary

43.A. when                  B. as                    C. that                       D. until

44.A. struck                  B. sank                 C. beat                       D. ached

45.A. anyone                  B. someone            C. my car                   D. my son

46.A. chance            B. time                 C. turn                       D. lesson

47.A. mentally             B. physically         C. lightly                   D. painfully

48.A. story                  B. truth                C. explanation            D. process

49.A. borrowed            B. drove                      C. used                      D. ruined

50.A. nevertheless       B. moreover          C. or rather             D. on the contrary

51.A. guilt                   B. pain                 C. embarrassment       D. terror

52.A. still                    B. yet                   C. just                      D. only

53.A. remember           B. remind             C. warn                     D. inform

54.A. values             B. happens             C. cares                     D. matters

55.A. property             B. equipment               C. treasure                 D. fortune

选择题