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:
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)?
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。
甲煤Aar=32.46%,Mar=13.56%,Qnet,ar=18250kJ/kg,乙煤Aar=34%,Mar=5.6%,Qnet,ar=18990kJ/kg。以上两种煤,哪种煤的实际灰分含量较高,哪种煤对锅炉危害大?
某锅炉燃用京西无烟煤,其特性如下:Cdaf=94%、Hdaf=1.4%、Ndaf=0.6%、Odaf=3.7%、Sar=0.3%、Mar=4%、Aar=24%,燃料特性系数β=0.024,当过量空气系数α=1.1时,求实际空气量。
A.30、8
B.30、64
C.24、8
D.24、64
听力原文:M: Well, Mrs. Fern, how did you do in your driving test?
W: Not so well, I'm afraid.
M: Didn't you get your license?
W: No. My score was only 49 percent. The woman who tested me was very strict about everything.
M: Where did you lose the most points?
W: One thing was not turning my head before changing lanes or making turns.
M: Right. Using a turn signal isn't enough. To be safe, you have to glance back over your shoulder in the direction you want to go.
W: My teacher didn't emphasize that enough, or about maintaining the right distance behind the car in front.
M: That's right. You need a training distance of about one or two car lengths when you're driving.
W: My parallel parking was good. I've been practicing that a Iot.
M: What was your worst moment?
W: Waiting on an uphill stop for the light to change to green.
M: What happened?
W: Well, I let the car stall and forgot how to use the hand break. So the car rolled back and bumped the one behind me.
M: That alone probably failed you.
How did the woman do in the driving test?
A.She failed.
B.She barely passed.
C.She passed easily.
D.She wouldn't say.
听力原文:M: Well, Mrs. Fern, how did you do on your driving test?
W: Not so well, I'm afraid.
M: Didn't you get your license?
W: No. My score was only 49 percent. The woman who tested me was very strict about everything.
M: Where did you lose the most points?
W: One thing was not turning my head before changing lanes or making turns.
M: Right. Using a turn signal isn't enough. To be safe, you have to glance back over your shoulder in the direction you want to go.
W: My teacher didn't emphasize that enough, or about maintaining the right distance behind the car in front.
M: That's right. You need a training distance of about one or two car lengths for every 10 miles per hour you're going.
W: My parallel parking was good. I've been practising that a lot.
M: What was your worst moment?
W: Waiting on an uphill stop for the light to change to green.
M: What happened?
W: Well, I let the car stall and forgot how to use the hand break. So the car rolled back and bumped the one behind me.
M: That alone probably failed you. .
How did the woman do on her driving test?
A.She failed.
B.She barely passed.
C.She passed easily.
D.She wouldn't say.