Combined-type residual heat recovery system suitable for internal combustion engine

Abstract

The invention discloses a rankine cycle and temperature difference power generating module combined-type residual heat recovery system suitable for an internal combustion engine. The system comprises an intermediate temperature residual heat recovery subsystem and a low temperature residual heat recovery subsystem; a hydraulic pump, an evaporator, an over-heating device, an expander, a condenser and a liquid storage device in the intermediate temperature residual heat recovery subsystem are sequentially connected, and the intermediate temperature residual heat in the internal combustion engine is recycled by adopting a rankine cycle technology by the intermediate temperature residual heat recovery subsystem; tail gas emitted by a turbine end of a turbosupercharger is taken as a heat source for the evaporator; tail gas of an EGR (exhaust gas recirculation) system of the internal combustion engine is taken as a heat source for the over-heating device; the expander is connected with a power generator through a crankshaft of the expander, and the power energy output end of the power generator is connected with an energy recovery device; and in the low temperature residual heat recovery subsystem, three semi-conductor temperature difference power generating modules are adopted to recycle the tail gas heat at the outlet end of the evaporator of the intermediate temperature residual heat recovery subsystem, the heat of the supercharge air at the end port of a gas compressor of the turbosupercharger and the heat of the cooling water of a motor. According to the invention, the rankine cycle and the temperature difference power generating module are adopted to be combined to recycle the residual heat of the internal combustion engine, so that not only is the fuel oil economy of the internal combustion engine improved, but also the volume of the integral residual heat recovery system is reduced.

Description

technical field [0001] The invention relates to a compound waste heat recovery system of Rankine cycle and thermoelectric power generation module suitable for internal combustion engines, which belongs to the field of heat exchange of internal combustion engines. Background technique [0002] With the rapid rise of energy prices, energy saving has become a common concern of all walks of life. About more than 60% of the heat in the internal combustion engine is released into the atmosphere through the exhaust gas and cooling system, and is not used. Therefore, it can be achieved by effectively using the waste heat of the internal combustion engine Improve fuel economy of internal combustion engines. [0003] figure 1 It is a schematic diagram of an existing internal combustion engine system with an EGR system. like figure 1 As shown, the air in the atmospheric environment is compressed into a high-pressure medium-temperature gas through the compressor end of the turbocharg...

AI Technical Summary

Problems solved by technology

The advantages and disadvantages of the two are different. Among them, under the same high-temperature heat source and low-temperature cold source conditions: the waste heat recovery system based solely on the Rankine cycle has high efficiency, but the system is complex and large in size; the waste heat recovery system based solely on the semiconductor thermoelectric power generation module although , the system is simple, small in size, but low in efficiency

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