Wet combustion of waste liquors

Abstract

Abstract 1. A TWO-STAGE CONTINUOUS METHOD OF WET COMBUSTION OF A WASTE LIQUOR OBTAINED FROM THE SODA PROCESS FOR THE PULPING OF WOOD AND CONTAINING COMBUSTIBLE COMPONENTS, WHICH METHOD COMPRISES THE SERIALLY SUCCEEDING STEPS OF MIXING A STREAM OF THE WASTE LIQUOR WITH HEATED OXYGENATING GAS UNDER PRESSURE; PASSING THE MIXTURE OF A TEMPERATURE BETWEEN 450* AND 705*F. AND UNDER A PRESSURE BETWEEN 70 TO 225 ATMOSPHERES UPWARDLY THROUGH A FIRST REACTION ZONE IN THE LOWER COMPARTMENT OF A GENERALLY VERTICAL PRESSURE VESSEL WHEREIN TO EFFECT COMBUSTION OF A MAJOR PART OF THE COMBUSTIBLES CONTENT OF THE STREAM INTO AN INERT GASEOUS PHASE COMPRISING CARBON DIOXIDE AND STEAM, WITH GENERATION OF HEAT; PASSING THE RESULTING PARTIALLY OXIDIZED MIXTURE COMPOSED OF GASEOUS PHASE AT ELEVATED TEMPERATURE, UNDER PRESSURE UPWARDLY INTO A SECOND REACTION ZONE IN AN UPPER COMPARTMENT OF SAID PRESSURE VESSEL, THE SAID PARTIALLY OXIDIZED MIXTURE BEING PASSED AS A STREAM UPWARDLY THROUGH BUT OUT OF DIRECT CONTACT WITH LIQUID PHASE IN THE SECOND REACTION ZONE AND BEING THEN DISTRIBUTED INTO SAID SECOND REACTION ZONE ABOVE SUCH LIQUID PHASE; SEPARATING THE SAID INERT GASEOUS PHASE FROM LIQUID PHASE OF THE PARTIALLY OXIDIZED MIXTURE IN THE UPPER PART OF THE SECOND REACTION ZONE, DISCHARGING THE SAID INERT GASEOUS PHASE FROM THE UPPER PART OF THE SAID SECOND REACTION ZONE, THEREBY REDUCING THE PARTIAL PRESSURE OF THE INERT GASEOUS PHASE IN EQUILIBRIUM WITH THE SAID LIQUID PHASE, CAUSING THE SEPARATED LIQUID PHASE TO FLOW DOWNWARDLY AS A COLUMN OF LIQUID IN SAID SECOND REACTION ZONE, THE TEMPERATURE OF THE DOWNWARDLY FLOWING COLUMN OF LIQUID BEING AT A TEMPERATURE BETWEEN 450* AND 705.4*F. AND UNDER A PRESSURE BETWEEN 70 AND D225 ATMOSPHERES; SUBJECTING THE RESIDUAL COMBUSTIBLES CONTENT OF SAID DOWNWARDLY FLOWING COLUMN OF LIQUID, SUBSTANTIALLY FREE FROM THE AFORESAID GASEOUS PHASE TO FURTHER OXIDATION TREATMENT BY PASING AN OXYGENATING GAS UNDER PRESSURE UPWARDLY THROUGH SAID COLUMN OF LIQUID, THEREBY FORMING A FURTHER GASEOUS PHASE AND A SUBSTANTIALLY COMBUSTIBLES-FREE LIQUID PHASE, THE PARTIALLY PRESSURE OF OXYGEN IN CONTACT WITH THE LIQUID PHASE IN THE SECOND REACTION ZONE BEING AT LEAST AS GREAT AS THE PARTIAL PRESSURE OF OXYGEN IN CONTACT WITH THE LIQUID PHASE IN THE FIRST REACTION ZONE, AND THE TEMPERATURES IN THE FIRST REACTION ZONE AND IN THE SECOND REACTION ZONE BEING SUBSTANTIALLY THE SAME; CONTINUOUSLY DISCHARGING SAID FURTHER GASEOUS PHASE, IN ADMIXTURE WITH THE FIRST-MENTIONED GASEOUS PHASE, FROM ABOVE SAID COLUMN OF LIQUID; AND CONTINUOUSLY WITHDRAWING LIQUID PHASE, SUBSTANTIALLY FREE FROM COMBUSTIBLES, FROM THE LOWER PART OF THE SECOND REACTION ZONE.

Inventors

• 👤 J Morgan

Bibliographic Details