The invention discloses a combined type
internal combustion engine waste heat gradient utilization
system. The combined type
internal combustion engine waste heat gradient utilization
system is characterized by comprising three stages of
recovery cycles, namely a low-temperature cycle, a medium-temperature cycle and a high-temperature cycle, the high-temperature cycle is used for recovering EGR
waste gas heat of an
internal combustion engine, heating high-temperature working medium water into high-temperature steam and pushing a first expansion
machine to work, and the high-temperature cycle comprises a heat regenerator; the medium-temperature cycle is used for recovering heat of
exhaust gas of the internal
combustion engine and pushing a second expansion
machine to work; and the low-temperature cycle is used for recovering heat of cooling water of a cylinder sleeve, the low-temperature cycle is communicated with the heat regenerator for
heat regeneration and pushes a third expansion
machine to work, and the low-temperature cycle and the medium-temperature cycle share one condenser. According to the combined type internal
combustion engine
waste heat gradient utilization
system, three-stage recycling of price
heat energy is achieved.
Cascade recycling of exhaust energy is achieved through a
Rankine cycle principle and a generalized
Carnot cycle principle, and the energy
utilization rate is increased.