ENERGY RECOVERY METHOD OF LOW TEMPERATURE AND LOW TEMPERATURE DIFFERENCE

摘要

PURPOSE:To increase efficiency, by increasing outlet temperature of cooling water through a high boiling point fraction, contained in mixed gas, decreasing a low temperature pump up quantity, further performing a heat exchange of final residual liquid of an evaporator and condensed liquid and completely absorbing the gas at low pressure through heat exchange cooling. CONSTITUTION:Working fluid, mixed with a material of different boiling point, is evaporated by increasing its temperature with low temperature heat source fluid while successively flowing the working fluid in a plural number of evaporators 1, 2, 3, arranged in the order successively from higher operating pressure, and steam of the working fluid is guided respectively to and recovered with energy by different turbines 13, 14, 15 provided for every evaporator 1, 2, 3. While discharged gas from each turbine 13, 14, 15 is guided to condensers 24, 25, 26, condensed by heat absorbing fluid, and then uncondensed gas in the condensers 24, 25, 26 is absorbed by liquid, having cooled unevaporated residual liquid in the final stage evaporator 3, further pressure of condensed liquid, obtained by the condensers 24, 25, 26 in each stage, is increased, and this condensed liquid is returned to the evaporators 1, 2, 3.