Waste gas re-cooling system

Abstract

The invention discloses a waste gas re-cooling system. According to the system, a waste gas re-cooler is additionally arranged in the original cooling system of an engine, so that a part of waste gasdischarged by the engine is cooled and then mixed with fresh air to enter the engine to reduce the temperature of the gas entering the engine to participate in combustion, the cooling system realizesheat exchange between cold air and hot air through air cooling so as to achieve the purpose of reducing the air inlet temperature of an air inlet manifold, the system can reduce the heat of a water cooling EGR cooler scattering into the water cooling system, the system is easy to arrange in a whole vehicle due to the fact that only the cooler is added and a large amount of space is not occupied, the cooling problem of high air inlet temperature of a gas engine and other high-detonation-pressure engines can be solved, and a high-horsepower diesel EGR route engine can also solve the cooling problem by referring to the system.

Description

【Technical field】 [0001] The invention belongs to the field of heavy-duty automobile parts manufacturing, and in particular relates to an exhaust gas recooling system. 【Background technique】 [0002] Automobile exhaust emission standards have been continuously upgraded, and the natural gas National VI engine has transitioned from the original lean combustion to equivalent combustion, and an EGR exhaust gas recirculation system has been added. The heat dissipation of the water cooling system of the engine in this route increases by 50%-80% compared with the original National V at the high EGR rate operating point. Therefore, the matching of the vehicle cooling system has become a bottleneck restricting the design of the National VI standard gas vehicle. In addition, the high temperature of the intake manifold of a gas engine may easily cause engine knocking, so the development of an exhaust gas cooling device that does not increase the heat dissipation of the water cooling sy...

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Problems solved by technology

In addition, the high temperature of the intake manifold of a gas engine may easily cause engine knocking, so the development of an exhaust gas cooling device that does not increase the heat dissipation of the water cooling system has become the key to solving this problem; one solution is to directly blow the high-temperature exhaust gas. cold, but the whole vehicle is not easy to arrange, and has high technical requirements for the intercooler; therefore, it is very useful to develop an exhaust gas cooling device that has little influence on the layout of the whole vehicle, does not require high parts processing and manufacturing technology, and does not increase the heat of the water cooling system. necessary

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