Engine exhaust gas energy recovery system

Abstract

The invention provides an engine exhaust gas energy recovery system in the technical field of internal combustion engines, which comprises an engine cylinder, a gas compressor, turbines, a heat exchanger, a condenser and a booster pump, wherein the gas compressor, a first turbine and a second turbine are coaxially connected through connecting shafts; a gas outlet of a gas outlet pipe of the first turbine, a gas inlet of an exhaust pipe of the first turbine, a gas inlet of a gas inlet pipe of the second turbine and a gas outlet of a gas outlet pipe of the second turbine are all connected with the heat exchanger; and the condenser and the booster pump are sequentially mounted in the gas outlet pipe of the second turbine along the fluid flow direction. In the working process of an engine, flow media flowing through the second turbine are heated by engine exhaust gas flowing out of the first turbine in the heat exchanger and are enabled to expand and do work in the second turbine, so that more available energy can be obtained by the gas compressor, the gas inlet flux of the engine is increased and the output power is improved. The engine exhaust gas energy recovery system is reasonable in design and simple in structure, and is suitable for a turbocharging system in which the gas compressor is coaxially connected with the two turbines.

Description

technical field [0001] The invention relates to a turbocharging system in the field of internal combustion engines, in particular to an engine exhaust energy recovery system in which a compressor and two turbines are coaxially connected. Background technique [0002] From the current heat balance of the engine, the power used for power output only accounts for 40%-50% of the total heat of fuel combustion (diesel engine) or 25%-40% (gasoline engine), and other heat is discharged into the engine through the cooling system and exhaust gas. atmospheric environment. Therefore, recycling engine waste heat is an effective way to improve engine thermal efficiency. From the perspective of domestic and foreign exhaust energy utilization technologies, there are refrigeration, heating, thermoelectric power generation, fuel catalytic reforming, power turbine, and power cycle device. Due to the characteristics of low grade and difficult recovery of exhaust gas energy, there are still ma...

AI Technical Summary

Problems solved by technology

Due to the characteristics of low grade and difficult recovery of exhaust gas energy, there are still many problems in some existing technologies, such as the low energy conversion efficiency of using temperature difference to generate electricity, the implementation process of fuel catalytic reforming technology is relatively difficult, and the use of waste heat The purpose of cooling and heating is relatively simple, the scope of application of the power turbine is relatively narrow, and the structure of the subsequent power cycle device is relatively complicated, etc.

[0003] After searching the existing technical documents, it was found that Chinese Patent Publication No. CN1363764A, title of invention: internal combustion engine steam injection turbocharger system, the application discloses a method of heating liquid water by using engine exhaust heat energy, and heating the heated superheated water Steam is injected into the turbine before gas-steam mixing to increase the expansion work of the turbine, so as to achieve a steam injection turbocharging system that improves the part load performance of the engine, but because the steam injection turbocharging system needs to consume a certain amount of processed soft water, so its scope of use is limited

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