Combustion Gas Scrubbing Using Free-Jet Technology

Free-Jet scrubbing technology has been successfully used on a variety of combustion processes to control particulate and acid gas emissions. Free-Jet technology differs from conventional venturi technology in the way the scrubbing liquid mixes with the gas stream. In Free-Jet technology, combustion gas is brought through a converging throat, where the velocity is increased, and the gas is allowed to exhaust as a free-jet into an enclosed plenum. Scrubbing liquid is injected onto the perimeter of the gas stream as it exits the throat. As the scrubbing liquid strikes the gas jet it is sheared into fine droplets and turbulently mixed with the gas. These fine water droplets act as impact targets onto which particulates collide and are captured. The technology has been applied to rotary kiln, fluidized bed, and liquid waste combustion processes. Outlet particulate emissions below 0.01 gr/dscf and HCI removal efficiencies above 99% have been demonstrated.