Internal combustion engine system

Abstract

The invention discloses an internal combustion engine system and belongs to the technical field of internal combustion engines. The internal combustion engine system comprises an internal combustion engine (1), a first turbine (2), a first air compressor (3), a second turbine (4), an exhaust bypass valve (5) and a second air compressor (6), wherein an air inlet and an air exhaust port are arrangedon the internal combustion engine; the inlet of the first turbine communicates with the air exhaust port of the internal combustion engine (1); the inlet of the first air compressor communicates withthe atmosphere; the outlet of the first air compressor communicates with the air inlet of the internal combustion engine (1); the inlet of the second turbine communicates with the outlet of the firstturbine (2); the exhaust bypass valve is mounted between the internal combustion engine and the second turbine (4); the outlet of the exhaust bypass valve communicates with the inlet of the second turbine (4); the inlet of the second air compressor communicates with the outlet of the second turbine (4); the outlet of the second air compressor communicates with the atmosphere; the first turbine (2) is connected with the first air compressor (3) through a first shaft system (7), and used for driving the first air compressor (3) to rotate and do work through compression; and the second turbine (4) is connected with the second air compressor (6) through a second shaft system (8), and used for driving the second air compressor (6) to rotate and do work through compression. According to the internal combustion engine system disclosed by the invention, the two turbines and the two air compressors are adopted to form a turbocharging system and a reverse Brayton cycle system; meanwhile, the exhaust bypass valve is added, so that the air inlet boost pressure can be controlled on the one hand, and the waste energy can be further utilized on the other hand; and accordingly, the comprehensiveutilization ratio of the waste energy can be improved.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to an internal combustion engine system. Background technique [0002] Internal combustion engines play a very important role in national production and life. At present, the vast majority of vehicles and ships are powered by internal combustion engines. The internal combustion engine consumes a large amount of fossil fuels, but on average only 30%-40% of the energy is converted into mechanical energy, and nearly 60%-70% of the energy is dissipated into the atmosphere in the form of heat transfer during the working process of the internal combustion engine. Among them, the exhaust gas energy emitted by the internal combustion engine accounts for about 30% of the total energy. That is to say, the energy actually utilized by the internal combustion engine is in the same proportion as the exhaust gas energy emitted, which causes a great waste of energy. Recycling...

AI Technical Summary

Problems solved by technology

However, in this scheme, the exhaust gas discharged after passing through the turbine 2 still has a relatively high temperature, and part of the energy cannot be recovered, and the exhaust energy of the internal combustion engine is insufficiently utilized.

[0005] 2. Scheme two: In order to further utilize the exhaust gas energy discharged by the turbine 2 in the scheme one, the technical scheme of the prior art is to add a turbocharging system behind the turbocharger 2 on the basis of the scheme one, and adopt two-stage turbocharging technology, The two-stage turbo is used for intake boosting, but this solution is not suitable for situations where the power demand of the internal combustion engine is not large, and the matching of the two-stage supercharging system with the internal combustion engine is more complicated

Instead, on the basis of Scheme 1, the technology of adding a power turbine behind the turbine 2 is used to further recover the exhaust gas energy of the internal combustion engine, but this scheme requires that the gas pressure entering the power turbine is higher than atmospheric pressure, so when the exhaust gas entering the power turbine When the pressure is close to atmospheric pressure, the working ability of the power turbine is limited, and the exhaust gas energy of the internal combustion engine cannot be further recovered

Images