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提问人：网友anonymity 发布时间：2022-01-06
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Several industrial processes produce waste gases containing carbon monoxide. Normally these waste ga

ses contam no oxygen. They may be considered as mixtures of CO and N2. If they contain enough CO, it is common practice to mix them with air and burn them, using the heat released to generate steam or for some other practical purpose.
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第1题

Figure 7.15 on page 204 shows the frequency distribution of various values for the product of H times u for Peoria, Illinois. If the average daily emission rate for carbon monoxide for this city is 2×107g/(h·mi2) and the standard to be met is 10 mg/m3, what fraction of the time must we implement intermittent control to meet this standard？ Assume that the simple box model (Sec. 6.2) applies, that the size of the city is 5 mi by 5 mi, and that the background concentration is 2 mg/m3.

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第2题
A gas stream contains two sizes of particles, 50 wt% large and 50 wt% small. We pass this gas stream through two collection devices in series. The collection efficiencies are shown in the following table. What overall weight fraction of the particles is collected？
First collection

device

Second collection

Device

Collection efficiency for small particles

Collection efficiency for large particles

0.50

0.75

0.25

0.40

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第3题
A terrorist releases 100 g of nerve gas as a single instantaneous emission at ground level at point x=y=z=0, at time t=0. The wind speed is 3 m/s and the stability class is C and the mixing height, L, is 2000 m. Estimate the maximum instantaneous value of the nerve gas concentration that would be observed at a point 5 km directly downwind of the emission point (x=5km, y=z=0).
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第4题
At the 1986 Chernobyl nuclear accident, there was a very large release of radioactivity in a few minutes, followed by a slowly declining release rate over several months. The total release is estimated to have been about 5×107curies The winds carried the released materials all the way to Sweden, from which the first reports came that there had been a nuclear accident in the USSR.

For the purposes of this problem assume that there was an instantaneous release of 107curies of radioactive gases (and fine particles, which are assumed to remain in the atmosphere and not settle out). Then estimate the maximum ground level concentration of radioactive gases (curies/m3) when the radioactive cloud from the accident got to Sweden. Make the following assumptions:

(1) Ignore decay of the radioactive gases (i.e., assume their half-lives were infinite).

(2) Assume the distance between Chernobyl and Sweden is 1000 km.

(3) Assume that the wind speed was 3 m/s and the stability class C.

(4) Assume that the mixing height was 2000 m.

(5) Assume that mlXmg in the x direction(up and down the direction of the wind) has the same intensity as miXing in the y(crosswind)direction.

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第5题
Repeat the calculation of the adiabatic, perfect gas lapse rate for a gas that is 1.15 mol percent water; The water does not condense. The molar heat capacity Cp of water vapor may be taken as 4.1 R. How large an error do we make by ignoring this water in computing the adiabatic lapse rate？
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第6题
In the textbook Example 4.1, we have now discovered that the velocity measuring device was improperly calibrated. We have recalibrated it and find that the velocity, in order, should have been 8, 12, 16 and 20m/s.The concentration of the gas flowing in

the stack？

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第7题
We have tested a plant's emissions of particulates and found the following data:
Sample numberStack velocity, ft/sParticle concentration, g/m3
1

2

3

50

60

40

0.50

0.30

0.70

Each sample represents the average over a 20-min period. What was the average particle concentration in this stack over the whole 60 min of this test？

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第8题
On May 18, 1980, Mount Saint Helens in Washington ejected into the atmosphere an estimated 540 million tons of ash.
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第9题
某一工业锅炉烧煤30kg/h，含硫量2%，燃烧后有90%的SO2由...

某一工业锅炉烧煤30kg/h，含硫量2%，燃烧后有90%的SO2由烟囱排入大气。烟囱高30m，直径0.6m，烟气出口速度为20m/s，烟气温度为405K，大气温度为293K，烟囱出口处风速4m/s。试计算中性大气条件下SO2的地面最大浓度和出现的位置。

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第10题
已知干绝热递减率γd=1.0K/100m，塔高48.5米，测得塔顶与...

已知干绝热递减率γd=1.0K/100m，塔高48.5米，测得塔顶与地面的温差为0.7℃，则塔顶到地面的气层处于______状态。(稳定，中性，不稳定，逆温)

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