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Model No.: 1207110-1497 4110001841032
Exhaust gas recirculation (EGR) technology is currently the first choice for reducing NOx emissions from automotive diesel engines. Since the exhaust gas emitted by a diesel engine is an inert gas, the mixture of intake air and recirculated exhaust gas will reduce the oxygen content of the mixed gas and at the same time reduce the heat capacity. This will reduce the maximum combustion temperature and NOx production. The mixing of intake air and inert gas means less oxygen is provided for the combustion process, which will increase particulate emissions. However, if the recirculated exhaust gas is cooled and the EGR density is increased, the capacity conflict between intake air and exhaust gas can be minimized.
The EGR cooler is a device used to cool part of the exhaust gas returned to the engine cylinder. In order to reduce the content of nitrogen oxides (NOX) in automobile exhaust, part of the exhaust gas needs to be returned to the engine cylinder (ie exhaust gas recirculation technology). The exhaust gas temperature is as high as 600 °C. Before entering the engine intake system, it must be cooled Then, exhaust gas recirculation cooler (EGRC) came into being.
The function of the EGR cooler is to be installed in the automobile EGR system for reflux exhaust gas cooling. ERG system (exhaust gas recirculation system) is a technology and method used to reduce nitrogen oxides in automobile exhaust emissions. It is a product that must be used for automobile exhaust emissions to meet Euro IV and V standards. The principle and function of the cooler: automobile During the combustion process, a high temperature of about 500-600° will be generated, and the high-heat exhaust gas will not achieve the emission effect. The exhaust gas needs to be cooled and then returned to be effective. This process is completed in the cooler. If the EGR gas is not cooled, the hot return exhaust gas will heat the intake air, resulting in a substantial increase in the combustion temperature and pressure in the cylinder, offsetting the effect of EGR in reducing NOX, and in severe cases, it will also damage the structure of the engine body. Therefore, it is necessary to cool the high-temperature EGR gas through a cooler. The cooling object of the EGR cooler is the recirculated exhaust gas, which has a high temperature, and requires the heat exchanger to realize large heat transfer under a small heat exchange area, and at the same time, it must adapt to the characteristics of greater engine vibration.
However, the existing EGR cooler structure has a poor cooling effect and a weak structure, which is difficult to meet the exhaust gas treatment work of some turbocharged engines, resulting in a substantial increase in the combustion temperature and pressure in the engine cylinder, which offsets the effect of EGR in reducing NOX , So that the exhaust emission is not up to standard.