PROCESS FOR REMOVAL OF NITROGEN OXIDES AND SULFUR OXIDES FROM WASTE GASES

摘要

PROCESS FOR REMOVAL OF HYDROGEN OXIDES AND SULFUR OXIDES FROM WASTE GASES. . A process for removal of nitrogen oxides and sulfur oxides from waste gases by contacting the waste gases with a particulate material comprising an alkaline earth based absorbent for sulfur oxides. Essential features are a reaction temperature of 85-145.degree.C, a maximum value of 3 for the ratio of nitrogen oxides to sulfur oxides,and the presence of oxygen and moisture. In its preferred form the process comprises a spray drying-absorption reaction followed by particle separation in a bag house. Removal efficiency is improved by the presence of minor amounts of sodium sulfite together with the alkaline earth based absorbent. Also a special conveyance of material may be applied to improve efficiency.