What do you know about exhaust gas?

Automobile exhaust is the exhaust gas produced when automobiles are used. It contains hundreds of different compounds, among which pollutants are solid suspended particles, carbon monoxide, carbon dioxide, hydrocarbons, nitrogen oxides, lead and sulfur oxides.

Tail gas not only directly harms human health, but also has a far-reaching impact on human living environment. Sulfur dioxide in tail gas has a strong pungent smell. When it reaches a certain concentration, it will easily lead to "acid rain", which will cause acidification of soil and water sources and affect the growth of crops and forests. So what form will automobile exhaust take? Xiaomei interprets the color and harm of common exhaust gas for you.

Normal tail gas color

Normal tail gas color should be colorless or a little white, and white waste gas is usually small water droplets condensed by water vapor when it is cold. The water vapor and carbon dioxide produced after the fuel is fully burned will be discharged through the exhaust system, and the white tail gas will be formed after the water vapor is discharged and cooled.

Black tail gas

Black exhaust is often ignored by drivers, but this situation needs attention, not only because it pollutes the air, but also indicates that the car is faulty. Whether it is thick or thin black tail gas, almost all of them are related to insufficient combustion of gasoline. It may be because the air filter is blocked and the air intake is insufficient, or it may be because the spray atomization effect is not good. Although insufficient combustion will not cause much damage to the vehicle, it will increase fuel consumption, cause insufficient power and increase carbon deposition.

Blue tail gas

The blue tail gas is usually accompanied by a burning smell, which is a typical phenomenon of burning oil. If this happens, it is generally because of oil leakage, which leads to oil escaping into the combustion chamber. The so-called blue is not bright blue, but a gray blue, similar to the smoke produced by combustion, which needs us to distinguish carefully. There are many reasons for oil leakage, such as damage to the piston ring, cylinder head and cylinder wall of the vehicle. If the vehicle emits blue smoke during acceleration, it means that the piston ring of the vehicle has been damaged; If blue smoke is emitted during deceleration, the valve guide of the cylinder head is damaged.

Emulsion tail gas

A small amount of white tail gas is normal, but the thick and persistent milky tail gas indicates that there is something wrong with the car. This is probably because the coolant enters the combustion chamber and is discharged with the exhaust system, which is usually accompanied by a series of situations such as insufficient coolant and excessive engine temperature. You should go to the auto repair shop to check the maintenance in time, first check whether there is water in the oil tank, and then check whether the engine cylinder is damaged.

Gasoline smell tail gas

When gasoline can't be fully burned, the tail gas will smell of gasoline. Here, we should pay attention to distinguish the smell of gasoline in the exhaust gas from that in the car. If the car itself smells of gasoline when the exhaust gas is not discharged, it means that the gasoline may have leaked, and it is necessary to check the location where the gasoline drips. In addition, the engine needs a rich mixture when starting, so it is normal that the tail gas smells of gasoline when starting, but if it doesn't disappear after 30 seconds, it is necessary to check the engine.

Odor tail gas

If the automobile exhaust has an odor, which is neither gasoline smell nor engine oil burning smell, accompanied by the phenomenon of weak automobile acceleration and sharp increase in fuel consumption, it can usually be judged that the carbon monoxide in the exhaust exceeds the standard. The main reason for carbon monoxide exceeding the standard is insufficient combustion. If the tail gas contains excessive carbon monoxide, the oxygen sensor will fail, the three-way catalyst will be sintered at high temperature, and even the driving computer will be damaged. The consequences are very serious. Carbon monoxide is a toxic gas, which may cause death. Therefore, once the tail gas has an odor, it should be checked and handled in time.