Why are some industrial chimneys so high, like what’s the difference if it’s 150 or 300 meters?

Question

Why are some industrial chimneys so high, like what’s the difference if it’s 150 or 300 meters?

In: Engineering

Answer 1

Haven’t seen cooling mentioned. Cooling means a lot more stable gases are released and farther from people.

Also, people are overstating the effect of draft. There will be a temperature gradient from low at the top to high at the bottom. Flow is driven by the pressure delta in the ends, among other things. Longer stack doesn’t affect pressure at the base or flow that much