Continuous sulphate pulping method with countercurrent heating and concurrent cooking zones and apparatus therefor
阅读：551发布：2021-01-23
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1. A METHOD FOR THE CONTINUOUS COOKING OF WOOD CHIPS COMPRISING CONTINUOUSLY MAINTAINING A VERTICAL COLUMN OF WOOD CHIPS IN A FLUID MEDIUM WHILE ADVANCING WOOD CHIPS THROUGHOUT THE LENGTH OF SAID COLUMN FROM THE INPUT TO THE OUTPUT END THEREOF INTRODUCING WOOD CHIPS TO THE INPUT END OF SAID COLUMN AND DISCHARGING COOKED CHIPS FROM THE OUTPUT END OF SAID COLUMN MEANWHILE TREATING SAID WOOD CHIPS IN TWO SUCCESSIVE ZONES IN SAID COLUMN, A HEATING ZONE ADJACENT THE INPUT END OF SAID COLUMN AND A COOKING ZONE SPACED FROM THE INPUT END OF SAID COLUMN BY SAID HEATING ZONE, REMOVING LIQUID FROM THE END OF SAID COOKING ZONE REMOTE FROM SAID HEATING AND COOKING ZONES AND INTRODUCING A HEATED CHEMICAL AGENT COMPRISING A SOLUTION OF SODIUM HYDROXIDE, SODIUM CARABONATE, AND SODIUM SULFIDE AND REINTRODUCING AT LEAST A PORTION OF SAID REMOVED LIQUID AT A LOCATION WITHIN THE COLUMN BETWEEN SAID HEATING AND COOKING ZONES AND REMOVING LIQUID FROM THE INPUT END OF SAID COLUMN THEREBY CAUSING LIQUID FLOW THROUGHOUT SAID HEATING ZONE IN A DIRECTION TOWARD THE INPUT END OF SAID COLUMN AND THROUGHOUT SAID COOKING ZONE IN A DIRECTION AWAY FROM THE INPUT END OF SAID COLUMN.
4. APPARATUS FOR THE CONTINUOUS COOKING OF WOOD CHIPS COMPRISING: WOOD CHIP LIFTING MEANS MOUNTED ADJACENT THE ENTRANCE END OF SAID VESSEL TO EXACTLY LIFTING FORCE DIRECTLY ONLY ON WOOD CHIPS LOCATED AT THE ENTRANCE END OF SAID VESSEL PROGRESSIVELY TO COMPACT SAID WOOD CHIPS AND TO ADVANCE THE MASS OF SAID WOOD CHIPS PROGRESSING UPWARDLY THROUGHOUT SAID ZONES WHILE PERMITTING FREE MOVEMENT OF LIQUID THROUGH SAID MASS, WOOD CHIP DISCHARGE MEANS ADJACENT THE UPPER END OF SAID VESSEL EFFECTIVE TO MAINTAIN A PREDETERMINED LEVEL OF THE TOP OF SAID MASS OF WOOD CHIPS BELOW THE TOP OF SAID VESSEL, LOWER STRAINER MEANS ADJACENT THE BOTTOM OF SAID VESSEL UPPER STRAINER MEANS ADJACENT THE TOP OF SAID VESSEL FOR REMOVAL OF LIQUID FROM SAID VESSEL INLET MEANS FOR INTRODUCING A HEATED CHEMICAL TREATING AGENT INTO SAID VESSEL, AT A LOCATION SPACED BETWEEN SAID UPPER AND LOWER STRAINER MEANS, MEANS FOR RECIRCULATING LIQUID FROM SAID UPPER STRAINER MEANS INTO SAID VESSEL AT SAID LOCATION WITHIN SAID VESSEL SPACED BETWEEN SAID UPPER AND LOWER STRAINER MEANS SAID INLET MEANS AND STRAINER MEANS CAUSING LIQUID FLOW IN A DOWNWARD DIRECTION FROM THE INJECTION POINT OF SAID LIQUID TO SAID LOWER STRAINER MEANS AND IN AN UPWARD DIRECTION FROM THE INJECTION POINT OF SAID LIQUID TO SAID UPPER STRAINER MEANS.
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