The answer is Scrubber. The coal burning power plant installs equipment called Scrubbers, which remove the sulfur dioxide from gases leaving the smokestack. Scrubbers help to remove most of the sulfur oxides from the smoke stack exhaust of a coal burning power plant. In the scrubber, there is a water spray that produces a cloud of fine water droplets. The water is mixed with crushed limestone, which reacts with the sulfur and pulls it out of the exhaust.
