METHOD FOR RECOVERING HEAT IN APPARATUS OF REDUCED PRESSURE SYSTEM

摘要

PURPOSE:To effectively recover the heat energy of steam exhausted from a furnace top, by using a gas discharged from an ejector provided to a distillation tower or a diffusion tower operated under reduced pressure as the heat source of a reboiler. CONSTITUTION:A stock gas or a diffusing gas is introduced into a distillation tower 1 from a line 10 while steam is generated from the tower top but this steam enters a condenser 3 from a line 2 to be condensed therein and the part thereof is returned to the distillation tower 1 from a line 11 or taken out to the outside from a line 11A. In this case, the non-condensible gas issued from the condenser 3 and the gas bypassing the condenser 3 enter an ejector 4 to be pressurized therein by steam or the gas for driving the ejector 4 from a line 12 and emitted from said ejector 4. Theis gas is introduced into a reboiler 5 through a line 13 and used in order to reheat a tower bottom liquid recirculated from the tower bottom part through a line 14.