A pollution control device in the stack of a coal-burning facility which uses a liquid spray to remove pollutants, especially sulfur dioxide, from emissions. The process is called flue gas desulfurization.
Any device in which a contaminant, solid or gaseous, is removed from a gas stream by impacting it with liquid droplets. (Types include spray towers, packed towers, cyclone scrubbers, jet scrubbers, venturi scrubbers and impingement scrubbers.)
A filter that removes particles and contaminants from the air. Primitive scrubbers to remove CO2 from a vessel's air supply have been in existence since the days of ancient submarine warfare. Modern scrubbers use biological agents to turn CO2 into oxygen and defensive nanobots to repel enemy nanobot attacks (see Technology, Nanotechnology).
Any of several forms of chemical/physical devices which operate to neutralize sulfur compounds formed during coal combustion. These devices combine the sulfur in gaseous emissions with other chemicals to form inert compounds, such as gypsum, that must then be removed for disposal. Although effective in substantially reducing sulfur from combustion gases, scrubbers require about 6% to 7% of a power plant's electrical output and thousands of gallons of water to operate.
Any of several forms of chemical/physical devices that remove sulfur compounds formed during coal combustion. These devices, technically know as flue gas desulfurisation systems, combine the sulfur in gaseous emissions with another chemical medium to form inert "sludge," which must then be removed for disposal.