Cascade recovery system for multi-quality waste heat of internal combustion engine exhaust

Abstract

The invention aims to provide a cascade recovery system for multi-quality waste heat of internal combustion engine exhaust. The cascade recovery system comprises a two-stage waste heat recovery loop;the two-stage waste heat recovery loop comprises a primary loop and a secondary loop; the primary loop comprises an evaporator, a steam turbine, a condenser and the like; and the secondary loop includes an energy storage pool and a low temperature difference Stirling engine. In the working process, the primary loop is based on the Rankine cycle principle, and working medium water is heated by high-quality exhaust energy, generates phase change, and expands to do work to push the steam turbine to rotate; and the secondary loop is based on the generality Carnot cycle principle, and residual energy in secondary exhaust gas discharged by the steam turbine is stored in the energy storage pool to provide a stable heat source for the low temperature difference Stirling engine to work continuously. A control unit manages operation of the system, and an energy evaluation unit calculates system parameters and the efficiency. The system realizes cascade recovery and utilization of energy, has high energy conversion efficiency and works reliably.

Description

technical field [0001] The invention relates to a waste heat recovery device of an internal combustion engine. Background technique [0002] Energy is an important material basis for human survival and development. With the development of society, energy consumption is increasing day by day, among which the consumption of fossil energy occupies a large proportion in the total energy consumption. In recent years, with the rapid development of the economy, the demand and usage of internal combustion engines have greatly increased, but their energy utilization rate is low, only about 40% of fuel energy is converted into mechanical energy, and other heat is released to the atmospheric environment center through exhaust gas and cooling water . [0003] The internal combustion engine is currently the most efficient power machine, but the energy in the exhaust gas accounts for about 30% of the total energy of fuel combustion. The quality of the exhaust energy is high, it has a st...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a cascaded recovery system for exhaust multi-quality waste heat of internal combustion engines that solves many shortcomings such as low heat recovery efficiency, poor reliability, and complex system structure of current engine exhaust waste heat recovery devices.

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