Question

Why is smoke from chimneys of industries passed through cottrell precipitator?

Answer 1

1. No-one likes smoke.
2. Whether it's rooms full of cigarette fumes or cities choking with pollution, we'd all much prefer to be breathing cool, clean air.
3. But industry is the lifeblood of our economic system and many people assume we have to put up with factory and power-plant smokestacks that choke up the air.
4. In fact, technology has had a pretty good solution to the problem for over a century, in the shape of electrostatic smoke precipitators.
5. Also known as scrubbers, these cunning, static-electric filters snatch the soot and ash from dirty air as it flows along a pipe, greatly reducing pollution and helping to improve the environment.
6. Let's take a closer look at how they work!
7. Smoke is an aerosol of soot particles dispersed in hot, rising air.

• The "smoke" coming out of a smokestack can contain all kinds of different pollutants, including soot (unburned carbon) and fly ash (fine, dusty residues from burned material), plus polluting gases such as sulfur dioxide and nitrogen oxides.