| 摘要 |
PURPOSE:To increase an amount of a power recovered, by a method wherein, in a device which recovers heat from hot water exhausted from a factory by a Rankine cycle utilizing a low temperature difference, high temperature oil is injected during a process in that working medium steam flows from the suction hole of an expander to an exhaust port. CONSTITUTION:Working medium steam, which is heated and vaporized in a vaporizer 13 by means of hot exhaust water serving as a heat source, is fed to an oil injection type screw expander 11 to serve therein so as to drive a load 12 such as generators. In which case, high temperature oil, heated by a heater 17, is injected through nozzles 19, mounted in a multistage, in a process in that the working medium steam flows within the expander 11 from a suction hole to an exhaust hole. This forces the working medium steam to overheat in addition to provision of lubricating and sealing action. Mixture of the working medium steam, flowing through the expander 11, and oil is separated by an oil separator 14, and after the working medium steam is cooled and condensed by a condenser 15, it is returned to the vaporizer 13. |
