Composite type internal combustion engine waste heat gradient utilization system

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a compound waste heat cascade utilization system of an internal combustion engine. Background technique [0002] At present, the effective work output by the vehicle engine only accounts for about 30% of the total energy of fuel combustion, and the remaining energy is discharged into the atmosphere in the form of exhaust heat, causing great waste. If this part of energy can be recycled, it can not only improve the thermal efficiency of the internal combustion engine, but also improve the fuel economy of the car. [0003] The Rankine cycle can realize the energy recovery of automobile exhaust very well, and the high-efficiency Rankine cycle waste heat recovery device can ensure the cascade recovery of multi-taste waste heat, so the present invention improves the two-stage Rankine cycle waste heat recovery device, which increases the recovery efficiency and reduce irreversible...

AI Technical Summary

Problems solved by technology

[0002] At present, the effective work output by the vehicle engine only accounts for about 30% of the total energy of fuel combustion, and the remaining energy is discharged into the atmosphere in the form of exhaust heat, causing great waste

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