Why Do Diesel Vehicles Emit Black Smoke?

[ArielAnn]

Diesel vehicles emit black smoke due to the following reasons: 1. Incomplete combustion of vehicle fuel; 2. Uneven fuel supply within the cylinder; 3. Poor atomization effect during diesel combustion, resulting in insufficient fuel supply to the cylinder; 4. Insufficient air intake by the inhalation system. Black smoke emission from the engine can lead to increased fuel consumption, reduced power output, and the accumulation of a large amount of carbon deposits on components such as pistons, piston rings, and valves. Black smoke, also known as soot, is generated because diesel engines undergo non-homogeneous combustion, where the chemical reaction conditions vary across different regions of the combustion chamber and change over time. Therefore, black smoke is likely produced through various pathways. Diesel is a complex hydrocarbon, and unburned diesel injected into the combustion chamber decomposes under high temperatures, forming carbon black. This carbon black is expelled along with the exhaust gases, creating black smoke. Black smoke is a product of incomplete combustion, formed when hydrocarbons undergo pyrolysis under high-temperature, oxygen-deficient conditions and subsequently polymerize.