Features of semi-dry ammonia desulfurization

Abstract

Semi-dry ammonium desulfurization technology is proposed to meet the requirements of Directive 2010/75/EU on reducing sulfur dioxide emissions and obtaining dry product-ammonium sulfate. The peculiarity of this technology is the presence of a gas-phase reaction of sulfur dioxide with ammonia along with the absorption of SO 2 in drops of ammonia water. The efficiency of the absorption of sulfur dioxide by gaseous ammonia (up to 90%) has been experimentally proved, subject to the presence of water vapor in the gas, the volume concentration of which should exceed the volume concentration of ammonia.

Experimental investigation of removal of sulfur dioxide from exhaust gas by using semi-dry flue gas desulfurization (FGD)

“…Greater efficiency gains will, in theory, necessitate a surplus of calcium oxide. Still, because the current is applied primarily on the appearance of sludge raindrops 7 , an excess of calcium oxide produces larger raindrops while also attempting to minimise adsorption sites for chemicals such as Ca(OH)2 and sulphur dioxide 8 . When exposed to high levels of Ca(OH)2, the productivity of these FGD seedlings can drop by as much as 20%.According to research on the drying and absorbing oxidation of toluene, sulphate elimination is partial, creating a waterproof deposition process at the photon's top, exposing a residual coating 9 .…”