Evaporation system and method

Claim 1

IN AN EVAPORATOR HAVING AN ELONGATED CASING HAVING A HEATING SPACE THEREWITH, A PLURALITY OF SPACED PARALLEL TUBES DISPOSED LONGITUDINALLY IN THE CASING, FIRST AND SECOND HEADERS CONNECTED TO THE OPPOSITE ENDS OF THE TUBES ADJACENT THE RESPECTIVE FIRST AND SECOND ENDS OF THE CASING, MEANS INCLUDING AN INLET PORT IN THE CASING TO INTRODUCE A HEATING FLUID INTO SAID CASING ADJACENT A FIRST END THEREOF, MEANS TO INTRODUCE LIQUOR TO BE EVAPORATED INTO ONE OF SAID HEADERS, AND MEANS TO EXHAUST CONCENTRATED LIQUOR AND VAPOR FROM THE OTHER OF SAID HEADERS, THE IMPROVEMENT WHICH COMPRISES A GAS EXHAUST VENT IN A PART OF THE CASING REMOTE FROM THE HEATING FLUID INLET PORT THEREIN, ON A SIDE THEREOF OPPOSITE SAID INLET PORT, AND SUBSTANTIALLY SPACED FROM ONE SIDE OF THE CASING TO THE ING, A BAFFLE EXTENDING FROM ONE SIDE OF THE CASING TO THE OTHER AND FROM THE FIRST END OF THE CASING TO TERMINATE AT A FREE END SUBSTANTIALLY BEYOND THE GAS EXHAUST VENT AND SPACED FROM THE OTHER, SECOND END OF THE CASING, THE BAFFLE SUBSTANTIALLY DIVIDING THE HEATING SPACE IN THE CASING INTO A FIRST HEATING SPACE PORTION IN DIRECT COMMUNICATION WITH THE INLET PORT AND A SECOND HEATING SPACE PORTION IN DIRECT COMMUNICATION WITH THE GAS VENT, EACH OF SAID TWO PORTIONS OF THE HEATING SPACE CONTAINING SOME OF SAID TUBES, SAID TWO SPACES BEING CONNECTED ONLY AT THE ENDS THEREOF ADJACENT THE SECOND END OF THE CASING BY A PASSAGE BETWEEN THE FREE END OF THE BAFFLE AND THE SECOND END OF THE CASING, WHEREBY HEATING FLUID UPON ENTERING THE INLET PORT TRAVELS THROUGH THE CASING BETWEEN AND AROUND THE TUBES IN THE FIRST PORTION OF THE HEATING