Combined cycle thermoelectric conversion system utilizing multi-grade waste heat of internal combustion engine

Abstract

The invention provides a combined cycle thermoelectric conversion system utilizing multi-grade waste heat of an internal combustion engine. According to the system, combined organic Rankine cycle is formed by high-temperature grade cycle and low-temperature grade cycle, heat is supplied by exhaust waste heat of the internal combustion engine, supercharged and mid-cooling waste heat, exhaust gas recirculation waste heat and cooling water waste heat, a cooling quantity is provided by cold wind, and the system comprises a high-temperature grade working medium pump, a high-temperature grade heat regenerator, a high-temperature grade exhaust heater, a high-temperature grade EGR (exhaust gas recirculation) heater, a high-temperature grade expansion engine, a high-temperature grade condenser, a low-temperature grade working medium pump, a low-temperature grade heat regenerator, a low-temperature grade cooling water heater, a low-temperature grade supercharged air heater, a low-temperature grade exhaust heater, a low-temperature grade EGR heater, a low-temperature grade expansion engine, a low-temperature grade condenser, a low-temperature grade condenser fan and a power generator. According to the combined cycle thermoelectric conversion system utilizing multi-grade waste heat of the internal combustion engine, comprehensive and efficient utilization of multi-grade waste heat of the internal combustion engine can be achieved, further, irreversible loss is smaller when both the high temperature and the low temperature adopt supercritical expanding cycle, and the integral efficiency of the internal combustion engine can be effectively improved.

Description

technical field [0001] The invention relates to the application field of internal combustion engine energy-saving technology, in particular to a combined cycle thermoelectric conversion system suitable for high-efficiency utilization of multi-grade waste heat of internal combustion engines. Background technique [0002] The internal combustion engine is one of the most widely used power devices. At present, my country has become the world's largest manufacturer of internal combustion engines. In 2010, the total output of internal combustion engines was 75 million units, 22.4 million units were exported, and the total power exceeded 1.35 billion kilowatts. More than 66% of my country's total oil; at the same time, internal combustion engines are also CO 2 One of the main emission sources. Therefore, it is an important demand for my country's energy conservation and emission reduction work to carry out research on energy saving of internal combustion engines and improve the fu...

AI Technical Summary

Problems solved by technology

The former has low efficiency and a large device, which cannot be widely used in internal combustion engines as mobile power devices; while the latter, due to the energy degradation treatment of waste heat of exhaust gas, greatly reduces the expansion work recovered through the bottoming cycle, and the efficiency of the bottoming cycle is also low. At the same time, through the secondary heat exchange of the heat transfer oil circulation, the irreversible loss is further increased

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