Two-stage expansion injection waste heat recovery system of internal combustion engine

Abstract

The invention discloses a two-stage expansion jet type waste heat recovery system of an internal combustion engine. According to the scheme, an ORC main circulating system is formed by sequentially connecting a condenser, a lower-pressure working medium pump, a high-pressure working medium pump, a high-temperature preheater, a high-temperature intercooler, a high-temperature flue gas heat exchanger, a first expansion machine, a jet pipe and a second expansion machine in series. A low-temperature intercooler, a low-temperature evaporator and a low-temperature flue gas heat exchanger are sequentially connected between the high-pressure working medium pump and the jet pipe and between the low-pressure working medium pump and the jet pipe, so that the ORC main circulating system is divided into a high-temperature stage branch and a low-temperature stage branch. Cooling water of a cylinder sleeve of the internal combustion engine is connected to the water side of the high-temperature preheater and the water side of the low-temperature evaporator and then returns to the cylinder sleeve. Intake air of the internal combustion engine enters the internal combustion engine by sequentially passing the air side of a gas compressor in a turbocharger, the air side of the high-temperature intercooler and the air side of the low-temperature intercooler. Exhaust gas of the internal combustion engine is connected to a turbine of the turbocharger, the high-temperature flue gas heat exchanger and a reheater in sequence. Waste heat of each part of the internal combustion engine waste heat recovery system can be utilized according to the quality ladder of the waste heat so that efficiency of the internal combustion engine waste heat recovery system can be improved obviously.

Description

technical field [0001] The invention belongs to the waste heat recovery and utilization technology of internal combustion engines, and in particular relates to a secondary expansion injection waste heat recovery system for internal combustion engines. Background technique [0002] With the increasing shortage of energy and the increasingly serious environmental pollution problems, the technology of energy saving and emission reduction of internal combustion engines has attracted more and more attention from the world. A considerable part of the heat released by the combustion of engine fuel is discharged from the vehicle in the form of waste heat. In addition to causing energy waste, it also causes serious pollution to the atmospheric environment. Recovering this part of energy can significantly reduce fuel consumption, so the use of Organic Rankine Cycle (ORC) technology to recover waste heat from internal combustion engines has become a current research focus. The ORC sys...

AI Technical Summary

Problems solved by technology

The single-stage ORC cycle does not fully utilize waste heat, and the working fluid after expansion still has high temperature and energy, which reduces the efficiency of the ORC system

If one intends to increase the parameters of the secondary expansion work, there are many problems

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