ENGINE WASTE HEAT RECOVERY POWER-GENERATING TURBO SYSTEM AND RECIPROCATING ENGINE SYSTEM PROVIDED THEREWITH

摘要

Provided is an engine waste heat recovery power-generating turbo system suitable for practical use, which recovers, in the form of electricity, energy discarded from an engine. Specifically, provided is an engine waste heat recovery power-generating turbo system (1) which generates electricity by using waste heat available in a reciprocating engine (3) comprising: a jacket cooling water circulatory system (9); and an exhaust passage (15) which exhausts high-temperature combustion gas in the form of exhaust gas. The engine waste heat recovery power-generating turbo system (1) is provided with a medium circuit (27) and a power generator (29). While using a low-boiling medium the critical temperature of which is about 80 - 200 °C, the medium circuit (27) forms a closed-loop Rankine cycle by means of: an evaporator unit (33); a turbine (35) which expands the low-boiling medium; a condenser (37); and a turbo pump (39) which causes the low-boiling medium to rise in pressure. The power generator (29) is coaxially coupled to the turbine (35), and generates electricity by being driven to rotate by the turbine (35) which rotates with the expansion of the low-boiling medium. The evaporator unit (33) is provided with an exhaust gas heat exchanger (45) which evaporates the low-boiling medium by at least causing heat exchange between the exhaust gas and the low-boiling medium.