Special vehicles will implement the national six/EURO 6 emission standards in China
Time:2019-10-09
Views:972
With the development of the economy, environmental pollution is becoming more and more serious. In order to protect the environment we rely on, countries around the world have adopted various environmental protection measures, such as vehicle emission limits. At present, China’s vehicle emission standards are Guowu and Guoliu is about to put into action.
Before we get to know these English letters, we must first know that the engine exhaust includes gaseous pollutants and particulate pollutants. Among them, gaseous pollutants are carbon monoxide, nitrogen oxides, equivalent nitrogen dioxide, hydrocarbons; hydrocarbons, particulate pollutants are mainly carbon, condensed hydrocarbons, sulfuric acid brine compounds, so to make the exhaust emissions meet the requirements For the limits, the corresponding processing devices must be installed, and these devices are usually represented by English abbreviations.
DOC (Oxidation Catalytic Converter): To achieve oxidation treatment of carbon monoxide and hydrocarbons.
SCR (Selective Catalytic Reduction System): Considering the corrosivity, toxicity and compulsory irritancy of ammonia, the reducing agent (urea) is used to selectively reduce nitrogen oxides to nitrogen in an oxygen-rich environment under the action of a catalyst. water.
EGR (Exhaust Gas Recirculation): In order to reduce the nitrogen oxide content in the exhaust gas, the OEM has chosen to inject the exhaust gas into the engine cylinder for combustion, thereby reducing the nitrogen oxide content in the exhaust gas.
Hi-SCR (Carbon Hydroxide Converter): It is mainly used in combination with SCR (Selective Catalytic Reduction System) and DOC (Oxidation Catalyst) to reduce the content of nitrogen oxides in the exhaust gas.
DPF (Particle Trapper): The unoxidized particles (soot particles) in the exhaust gas are trapped in the trap, and the high-temperature combustion emits carbon dioxide which is harmless to the human body.
Before we get to know these English letters, we must first know that the engine exhaust includes gaseous pollutants and particulate pollutants. Among them, gaseous pollutants are carbon monoxide, nitrogen oxides, equivalent nitrogen dioxide, hydrocarbons; hydrocarbons, particulate pollutants are mainly carbon, condensed hydrocarbons, sulfuric acid brine compounds, so to make the exhaust emissions meet the requirements For the limits, the corresponding processing devices must be installed, and these devices are usually represented by English abbreviations.
DOC (Oxidation Catalytic Converter): To achieve oxidation treatment of carbon monoxide and hydrocarbons.
SCR (Selective Catalytic Reduction System): Considering the corrosivity, toxicity and compulsory irritancy of ammonia, the reducing agent (urea) is used to selectively reduce nitrogen oxides to nitrogen in an oxygen-rich environment under the action of a catalyst. water.
EGR (Exhaust Gas Recirculation): In order to reduce the nitrogen oxide content in the exhaust gas, the OEM has chosen to inject the exhaust gas into the engine cylinder for combustion, thereby reducing the nitrogen oxide content in the exhaust gas.
Hi-SCR (Carbon Hydroxide Converter): It is mainly used in combination with SCR (Selective Catalytic Reduction System) and DOC (Oxidation Catalyst) to reduce the content of nitrogen oxides in the exhaust gas.
DPF (Particle Trapper): The unoxidized particles (soot particles) in the exhaust gas are trapped in the trap, and the high-temperature combustion emits carbon dioxide which is harmless to the human body.
ASC (Ammonia Oxidation Catalyst): The conversion of reducing agent (urea) to ammonia, both DOC and ASC can significantly improve the SCR conversion rate.
The reason why the national six emissions are called the most stringent emissions in history, is mainly reflected in the exhaust gas NOx emission limit is 3-5 times stricter than the national five.
Special vehicles will also implement the national six emission standards, such as sewage trucks, cleaning and sewage trucks.
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