已知:Car=60%、Sar=2%、Har=1%、Mar=10%、Aar=20%、Nar=2%、Oar=5%,煤的低位发热量Qar,net,p=20935kJ/kg。
求:
A.12
B.23
C.14
D.32
某400t/h煤粉炉燃用煤的收到基成分为:Car=47.9%,Har=3.04%,Oar=5.15%,Nar=0.86%,Sar=0.45%,Aar=34.74%,Mar=7.86%,试计算煤的干燥无灰基元素成分及灰的干燥基含量。
已知锅炉每小时燃煤100t,该煤的成分为:Car=51.625%、Sar=1.0%、Har=3.0%、Mar=13%、Aar=20%、Nar=1.375%、Oar=10%,锅炉房温度为30℃,β=0.077,在完全燃烧情况下,若测得炉膛出口处RO2=14%,而排烟处(RO2)py=12.5%。求每小时漏入烟道的干空气量。
已知煤的分析数据如下:Car=56.83%,Har=4.08%,Oar=9.63%,Nar=0.73%,Sar=0.63%,Mar=8.98%,Aar=19.1%,Vdaf=34.28%,Qar,net,p=22154kJ/kg。求此种煤完全燃烧时理论空气量V0是多少?若某锅炉燃用此煤,每小时耗煤量B=100t,炉膛出口氧量O2=3.5%,所需的实际空气量Vk为多少(在标准状态下)?
18:Which of the following can be called as a "lame duck"?
A.A disabled little child.
B.A hard-working farmer.
C.A politician who has to come to the end of his power.
D.An absent-minded old professor.
What does the author say about excessive Internet use?
A.People should be warned of its harmful consequences.
B.It has become virtually inevitable.
C.It has been somewhat exaggerated.
D.People haven't yet reached agreement on its definition.
A.Because nothing in the world can be taken for granted.
B.Because one always needs hard lessons before he becomes ma- ture.
C.Because each young generation is curious about everything.
D.Because the young generation must learn lessons to know drugs.
Machines will do ______ people.
A.most of the work instead of
B.some of the work instead of
C.as much work as
D.as little work as