What are the methods for exhaust gas treatment?

[Bernice]

Methods for exhaust gas treatment include: 1. Improving existing automotive power units and fuel quality: Diesel engines are preferred where possible. From a purely pollution perspective, both diesel and gasoline vehicles produce emissions, but without any mitigation measures, gasoline vehicles are more polluting. This is because gasoline vehicles emit higher levels of carbon monoxide (CO), carbon dioxide (CO2), and hydrocarbons (HC) compared to diesel vehicles. 2. Engine tuning: Reducing the injection timing advance angle lowers the engine's peak operating temperature (1500°C), thereby decreasing NOx formation. Enhancing injector quality and controlling combustion conditions (air-fuel ratio, combustion temperature, duration) ensures more complete fuel combustion, reducing CO, HC, and soot emissions. 3. Exhaust after-treatment measures: Advanced after-treatment technologies are widely adopted to purify vehicle exhaust and minimize pollution effectively. These technologies involve installing various purification devices in the exhaust system that utilize physical and chemical methods to reduce pollutants.