Pre-export HS code verification steps

With the increasing use of cars,Pre-export HS code verification steps engine exhaust has become one of the main sources of urban air pollution. Against this background, the development of new engine exhaust gas treatment technology has attracted much attention and has become an important means to create environmentally friendly travel. I. Harm of engine exhaust gas Engine exhaust gas mainly includes nitrogen oxides, carbon oxides, carbon monoxide and other harmful gases. These exhaust gases have caused great harm to the environment and human health. First of all, exhaust emissions will lead to air pollution, affect air quality, make people short of breath, and accelerate the occurrence of diseases.Secondly, exhaust emissions will cause problems such as climate change and acid rain to the environment. Finally, exhaust gas emissions will also cause harm to human health. By polluting the air and entering the human body, it may cause asthma, cardiovascular and cerebrovascular diseases and other health problems. II. In order to reduce the harm of engine exhaust emissions to the environment and human health, various new engine exhaust gas control technologies have been born. 1. SCR technology: select organic amine as a reducing agent to convert nitrogen oxides in the exhaust gas into nitrogen and water, and achieve a high degree of denitrification effect during discharge. Two. EGR technology: Adopt the external circulation exhaust gas recirculation method to mix an appropriate amount of exhaust gas into the intake system, so as to reduce the temperature of the combustion chamber and reduce the generation of nitrogen oxides. 3. DPF technology: adopts a special particle collector,Capture the particulate matter in the engine exhaust gas and make it burn into carbon dioxide and water through oxidation reaction. These technologies can not only reduce engine exhaust emissions and reduce the impact on the environment and human health, but also improve the fuel utilization and operating efficiency of vehicles, and further improve environmental protection performance and economy. III. The application prospect of the new engine exhaust gas treatment technology. At present, the new engine exhaust gas treatment technology has moved from the laboratory to the practical application, and has been applied more and more widely. On the one hand, with the continuous improvement and formulation of international environmental protection standards, the new technology of engine exhaust gas treatment will promote the development of the automobile industry in a more environmentally friendly and sustainable direction and contribute to the global environmental protection cause. On the other hand, the advocacy of domestic policies for environmentally friendly travel is also increasing, so as to promote the development of the automobile industry in a more environmentally friendly and healthy direction.It is foreseeable that the new technology of engine exhaust control will be applied to a wider range of automobile fields in the future, providing strong technical support for creating a more environmentally friendly and healthy way of travel. IV. Conclusion The application of new engine exhaust gas control technology is an important means to create environmentally friendly travel. Under the condition that the development of new energy vehicles is not mature enough, the continuous innovation of engine exhaust gas treatment technology is still of great significance. China should actively promote the application of engine exhaust gas treatment technology, accelerate the development of the automobile industry in a more environmentally friendly and healthy direction, and make greater contributions to solving air pollution and promoting sustainable economic development.

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