PURPOSE:To ensure a desired variation of temperature of condensate and improving the condensing performance of a waste heat recovery system by providing a variable throttle in a reflux pipe which runs from an aerator to a circulation type condenser. CONSTITUTION:In a circulation type condenser 11 the non-azeotropic mixture and cooling water flow in the opposit direction. The outlet 15 of the non- azeotropic mixture the condenser 11 is connected to a deaerator 16. A reflux pipe 18 is provided which runs from the gas phase outlet of the deaerator 16 to the non-azeotropic mixture inlet 14 of the condenser. A variable throttle 17 is disposed in the reflux pipe 18. By adjusting the quantity of circulating liquid at the variable throttle 17, the optimum thermodynamic concentration of non-azeotropic mixture the condenser 11 can be maintained. An expected variation of temperature of condensate can be ensured and the condensing performance be improved.
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