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尽管人们应用许多方法从烟气中清除二氧化硫和其它废气,虽然效率是较高的,但极难达到100％,因此排入烟囱的烟气中仍有一些二氧化硫。起初烟囱是为通风设计的,引进高大的烟囱并非为了清除污染物,而是为了把烟排放到足够高的大气中,使烟在到达地面以前有足够的时间消散。在一般的气象条件下,是烟囱高度的10倍或更远(除非烟囱低于周围建筑物的2.5倍,在这种情况下,吹过建筑物的风引起了涡流,涡流挟卷起烟气,把它们迅速带回地面)。地面最大浓度与烟囱有效高度的平方成反比。
Although many methods are used to remove sulfur dioxide and other exhaust gases from the flue gas, although the efficiency is high, it is extremely difficult to reach 100%. Therefore, there are still some sulfur dioxide in the flue gas discharged into the chimney. The chimney was originally designed for ventilation. The introduction of a tall chimney was not intended to remove pollutants but to discharge the smoke into a sufficiently high atmosphere so that the smoke had enough time to dissipate before reaching the ground. Under normal meteorological conditions, it is 10 times or more than the height of the chimney (unless the chimney is less than 2.5 times that of the surrounding buildings. In this case, the wind blowing over the building causes turbulence, and the vortex sweeps up the smoke. , Bring them back quickly to the ground). The maximum ground concentration is inversely proportional to the square of the effective height of the chimney.