Method and apparatus for the disposal of waste sulphite liquor

Claim 1

A PROCESS FOR THE CONTINUOUS EVAPORATION AND INCINERATION OF SULPHITE LIQUOR COMPRISING, PREHEATING A DIVIDED SOLID HEAT TRANSFER MATERIAL TO A TEMPERATURE ABOVE THE TEMPERATURE REQUIRED TO EVAPORATE THE LIQUOR, PASSING THE HEATED DIVIDED SOLID HEAT TRANSFER MATERIAL THROUGH A CONFINED EVAPORATING ZONE AS A DOWNWARDLY MOVING MASS, INTRODUCING THE LIQUOR INTO SAID EVAPORATING ZONE INTO CONTACT WITH THE MOVING MASS OF HEAT TRANSFER MATERIAL TO EVAPORATE SAID LIQUOR, WITHDRAWING THE VAPOROUS PRODUCTS OF EVAPORATION FROM THE TOP OF SAID EVAPORATING ZONE, SEPARATELY WITHDRAWING THE HEAT TRANSFER MATERIAL TOGETHER WITH EVAPORATION RESIDUE FROM THE BOTTOM OF SAID EVAPORATING ZONE, TRANSFERRING SAID MATERIAL AND SAID RESIDUE TO A CONFINED BURNING ZONE, PASSING SAID MATERIAL AND SAID RESIDUE THROUGH SAID BURNING ZONE AS A MOVING MASS INTRODUCING A COMBUSTION SUPPORTING MEDIUM INTO THE BURNING ZONE AND IGNITING THE COMBUSTIBLE PORTION OF THE RESIDUE TO THEREBY RAISE THE TEMPERATURE OF SAID MATERIAL, WITHDRAWING THE COMBUSTION GASES FROM SAID BURNING ZONE, AND RETURNING THE SUBSTANTIALLY RESIDUE FREE MATERIAL AGAIN TO THE EVAPORATION ZONE TO RESTART THE PROCESS CYCLE.