Apparatus for oxidation of black liquor

Abstract

Abstract THE APPARATUS FOR BLACK LIQUID OXIDATION FEATURES A VERTICALLY ORIENTED CONTAINER WHICH IS PROVIDED WITH AN INTERNAL HORIZONTAL PERFORATED PLATE AND AT LEAST ONE INTERNAL VERTICAL BAFFLE PLATE WHICH EXTENDS UPWARDS FROM THE HORIZONTAL PERFORATED PLATE. AN AIR STREAM IS PASSED VIA A FAN OR BLOWER INTO THE CONTAINER BELOW THE PREFORMED PLATE AND AIR STREAM PORTIONS RISE THROUGH THE PERFORATIONS. A STREAM OF BLACK LIQUOR IS PASSED VIA A PUMP AND LIQUOR SEAL INLET BOX INTO ONE END THE CONTAINER ABOVE THE PERFORATED PLATE, AND FLOWS HORIZONTALLY ACROSS THE UPPER SURFACE OF THE PERFORMATED PLATE PARALLEL WITH AND AROUND THE ENDS OF THE VERTICAL BAFFLE PLATES IN A SINUOUS OR SEPENTINE FLOW PATH. THE BLACK LIQUOR STREAM THUS FLOWS TRANSVERSE TO AND IN CONTACT WITH THE AIR STREAM PORTIONS RISING THROUGH THE PLURALITY OF PERFORATIONS. THE AIR STREAM PORTIONS ARE THEREBY DISPERSED INTO THE BLACK LIQUOR STREAM, AND THE BLACK LIQUOR IS OXIDIZED WITH THE CONCOMITANT GENERATION OF A FOAM. THE RESULTING MIXTURE OF AIR, FOAM AND OXIDIZED BLACK LIQUOR IS REMOVED HORIZONTALLY FROM AN OUTLET END OF THE CONTAINER ABOVE THE PERFORATED PLATE, VIA A SUBSTANTIALLY HORIZONTAL OUTLET CONDUIT USUALLY PROVIDED WITH A LOWER WEIR OR OTHER MEANS FOR MAINTAINING A LIQUOR LEVEL ON THE PERFORATED PLATE, AND THE MIXTURE IS PASSED TO A VERTICALLY ORIENTED DEFOAMING VESSEL, WHICH IS PROVIDED WITH A LOWER OUTLET FOR REMOVAL OF OXIDIZED BLACK LIQUOR FREE OF FOAM, UPPER MECHANICAL MEANS FOR BREAKING FOAM, INTO SEPARATE LIQUID AND GASEOUS PHASES, SO THAT THE LIQUID PHASE RETURNS TO THE MAIN BODY OF OXIDIZED LIQUOR IN THE LOWER PART OF THE VESSEL, AND MEANS TO DISCHARGE THE SEPARATED GASEOUS PHASE TO ATMOSPHERE.

Inventors

• 👤 Indravadan S Shah

Bibliographic Details