Supercritical/trans-critical carbon dioxide combined cycle power generation system for internal combustion engine waste-heat utilization

Abstract

The invention discloses a supercritical / trans-critical carbon dioxide combined cycle power generation system for internal combustion engine waste-heat utilization. After carbon dioxide enters a working medium pump from a condenser, the carbon dioxide is compressed into supercritical gas, then the compressed carbon dioxide gas is divided into two branches in an outlet of the working medium pump, wherein one branch is used as the working medium for a trans-critical carbon dioxide Rankine cycle system, and the another branch is used as the working medium of a supercritical carbon dioxide recompression Breton cycle system. The supercritical / trans-critical carbon dioxide combined cycle power generation system uses the waste heat of internal combustion engine exhaust gas as a heat source, and sequentially recycles the high quality waste heat of the internal combustion engine exhaust gas by supercritical carbon dioxide recompression Breton cycle, and recycles the low quality waste heat of theinternal combustion engine exhaust gas by trans-critical carbon dioxide Rankine cycle, and converts the waste heat energy of a power device into electric energy, has the characteristics of high thermal efficiency, compact structure, low maintenance cost and the like, and can significantly improve the economy of the power device.

Description

technical field [0001] The invention belongs to energy conversion and utilization technology, in particular to a supercritical / transcritical carbon dioxide combined cycle power generation system utilizing waste heat of an internal combustion engine. Background technique [0002] An internal combustion engine usually refers to a power machine in which the fuel combustion process and heat power conversion process occur inside the device, mainly including diesel engines, gasoline engines, gas turbines and fuel cells. During the working process of the internal combustion engine, a large amount of waste heat will be discharged through the exhaust gas. It is of great significance to select a suitable thermodynamic cycle mode and working medium to efficiently recover and utilize the waste heat of the exhaust gas to improve the fuel utilization rate of the internal combustion engine. At present, the traditional thermodynamic cycles used for waste heat recovery mainly include the ste...

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Problems solved by technology

[0005] However, there are two working fluids in this combined thermodynamic cycle system, which require different containers to store the working fluid; and each thermodynamic cycle needs to be equipped with its own cooler as a "heat sink", which increases the complexity and complexity of the combined cycle system. overall size

In addition, the waste heat recovery system uses a compressor and a working medium pump to increase the pressure of carbon dioxide and organic working medium, which consumes a lot of compression work, thereby reducing the power generation of the combined cycle.

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