问题 问答题 简答题

锅炉并汽的条件、操作程序及并汽后的操作要求?

答案

参考答案:

并汽应符合的条件

(1)锅炉设备运行正常,燃烧稳定。

(2)锅炉压力低于蒸汽母管压力0.1~0.2MPa。

(3)过热蒸汽温度低于母管30℃,且已经过允分暖管。

(4)汽包水位应在-50mm左右。

(5)蒸汽品质合格。

锅炉并汽操作程序

(1)报告值长、班长、通知汽机。

(2)缓慢开启蒸汽母管隔离阀进行并汽。

(3)并汽时司炉应密切注意汽温、汽压、水位和燃烧的变化。

(4)在并汽过程中,如引起汽机汽温急剧下降或发生蒸汽管道水冲击,应立即停止并汽,减弱燃烧,加强疏水,待恢复正常后重新并汽。

锅炉并汽后的操作

(1)关闭并汽阀前疏水阀。

(2)并汽后立即带上25%左右的流量,以防止过热器管过热,待汽温稳定检查各部分正常后,缓慢地以每分钟2吨的速度,增加负荷。

(3)根据负荷和汽温情况,关闭过热器出口联箱疏水阀。

(4)根据汽温情况,缓慢投入减温器运行。

(5)旁路进水,改为主给水管道进水,维持正常水位。

(6)关闭省煤器再循环门。

(7)记录各部分膨胀指示器。

(8)逐步投入各自动调整装置运行。

(9)对机组进行一次全面检查,并将点火过程中的主要操作及发现的问题,记录在有关的记录簿内。

(10)再次检查对照汽包水位计及其它水位计和汽压、汽温表指示,注意观察各仪表指示的变化,并开始抄表。

完形填空
Wishing to encourage her young son’s progress on the piano, a mother took her boy to a Paderewski concert. After they were   1 , the mother spotted a friend in the audience and walked down the passage to greet her.
Seizing the   2  to explore the wonders of the concert hall, the little boy rose and 3__ explored his way through a door marked “NO ADMITTANCE.” When the house lights dimmed and the concert was about to begin, the mother returned to her seat and 4  that the child was missing.
Suddenly, the curtains parted and spotlights focused on the impressive Steinway on stage. In __5  , the mother saw her little boy sitting at the key-board, 6__ picking out Twinkle, Twinkle Little Star.
At that moment, the great piano master made his 7 , quickly moved to the piano, and __8  in the boy’s ear, “Don’t quit. Keep playing.”
Then 9 over, Paderewski reached down with his left hand and began filling in a bass part. Soon his right arm reached around to the other side of the child and he added a running obbligato (伴奏). Together, the old master and the young novice (beginner) transformed a frightening situation into a wonderfully 10 experience. The audience was strongly 11  .
That’s the way it is in life. What we can accomplish on our own is hardly 12 . We try our best, but the 13  aren’t exactly graceful flowing music. But when we trust in the hands of a Greater Power, our life’s work 14 can be beautiful.
Next time you set out to 15 great achievements, listen carefully. You can hear the voice of the Master, whispering in your ear, “Don’t quit. Keep playing.”
小题1:
A.seatedB.satC.dressedD.rested
小题2:
A.factB.difficultyC.opportunityD.risk
小题3:
A.actuallyB.occasionallyC.fortunatelyD.eventually
小题4:
A.discoveredB.toldC.acceptedD.offered
小题5:
A.joyB.trustC.horrorD.pleasure
小题6:
A.quicklyB.personallyC.generallyD.innocently
小题7:
A.entranceB.disappearanceC.arrangementD.opening
小题8:
A.shoutedB.repeatedC.promisedD.whispered
小题9:
A.turningB.bendingC.risingD.handing
小题10:
A.creativeB.effectiveC.annoyingD.fearing
小题11:
A.addictedB.invitedC.attackedD.attracted
小题12:
A.abnormalB.remarkableC.unimportantD.ordinary
小题13:
A.goalsB.intentionsC.resultsD.purposes
小题14:
A.luckilyB.trulyC.slightlyD.fortunately
小题15:
A.overcomeB.enjoyC.accomplishD.become
单项选择题