Engine exhaust energy recovery system and method

Abstract

The invention discloses an engine exhaust energy recovery system which comprises a heat exchanger arranged between exhaust pipelines used for connecting an engine and a turbocharger, an energy conversion device used for communicating with the heat exchanger, and an energy storage device used for storing energy, wherein the heat exchanger is internally provided with a cooling medium. High-temperature exhaust gas discharged from the engine enters into the heat exchanger through the exhaust pipelines first, the cooling medium arranged in the heat exchanger is evaporated or boiled under the actionof the high-temperature exhaust gas and absorbs a lot of heat from the high-temperature exhaust gas, the cooling medium is driven to enter into the energy conversion device powdered by the heat, cooling medium is condensed in the energy conversion device and is then converted into energy in form of electric energy, chemical energy and the like, and the energy is stored and utilized through the energy storage device, so that the heat efficiency of the engine is improved effectively. The invention further discloses an engine exhaust energy recovery method.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to an engine exhaust energy recovery system and method. Background technique [0002] From the perspective of the energy balance of the engine, only a small amount of the total energy of fuel combustion is used for power output, and about 35% of the energy is discharged into the atmosphere through vehicle exhaust. Efficient approach to overall engine energy efficiency. [0003] At present, organic Rankine cycle waste heat recovery technology is generally used for engine exhaust waste heat recovery. However, the organic Rankine cycle waste heat recovery technology only recovers the energy after the turbocharger and even after the aftertreatment box. The energy density of the engine is low, and the improvement effect on the thermal efficiency of the engine is not obvious. [0004] Therefore, how to provide an engine exhaust energy recovery system capable of recovering and utilizing ...

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Problems solved by technology

[0003] At present, organic Rankine cycle waste heat recovery technology is generally used for engine exhaust waste heat recovery. However, the organic Rankine cycle waste heat recovery technology only recovers the energy after the turbocharger and even after the aftertreatment box. The energy density is low, and the improvement effect on the thermal efficiency of the engine is not obvious

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