What is the white powder like crystal in the middle of the exhaust pipe?

It is the crystallization of carbon dioxide emitted from the exhaust pipe, and these crystals are very polluting and very harmful to the body.

There are some water droplets in it, and when it encounters high temperature or relatively low temperature, it solidifies before there are some white crystals.

It is likely that the water and oil become crystals after heating, which is a kind of emulsification, and it can be cleaned frequently.

It is estimated that the hot gas will condense into water droplets when it encounters air, which will adhere to the exhaust pipe. Sulfides are found in automobile exhaust.

and carbides, which form dilute sulfuric acid when exposed to water.

or carbonic acid, which corrodes the exhaust pipe to form iron salts. Burn the oil.

There are several reasons for this: first, if the exhaust pipe only emits blue smoke when the vehicle is started, the most likely possibility is that the oil leaks due to a poor seal between the valve guide and the guide bearing hole, and then seeps into the combustion chamber.

Second, if blue smoke comes out of the exhaust pipe during normal operation, it may be due to excessive wear on the valve stem or the valve stem oil seal.

The failure causes oil in the valve chamber to be drawn into the combustion chamber, causing the oil to enter the combustion chamber with the flammable mixture through the intake pipe. Thirdly, if the exhaust pipe emits blue smoke and the oil injection port emits pulsating blue smoke, it can be preliminarily judged that the sealing effect of the piston-connecting rod group is not good, such as the gap between the piston and the cylinder wall is too large, the piston ring elasticity is small, the piston ring is locked or docked, and the piston ring is worn and the end clearance and side clearance are too large, resulting in the piston ring oil pumping.

There is also the problem of green crystals in the exhaust pipe, which may be antifreeze in gasoline.

Invisible cracks appeared in the cylinder head and cylinder liner during engine operation, and damage to the cylinder gasket led to antifreeze in the cylinder, resulting in green crystals in the exhaust pipe. Based on the above analysis, an on-site inspection can be carried out to determine the specific cause of the failure in order to more accurately specify the maintenance plan. Most of the heavy-duty diesel vehicles in China use the system, which requires urea.

The solution purifies the exhaust gas and reduces emissions.

So what is the reason for using urea solution for crystallization. There are two kinds of crystallization of urea solution for vehicles, one is the evaporation of water in the urea solution and the precipitation of urea crystals, and the other is the production of viscous urea by-products when the urea solution participates in the system reaction. Crystallization is most likely to occur in places such as the end flange and exhaust pipe of the urea injection device.

When the vehicle's urea solution crystallizes in a used car, the exhaust pipe of the engine can be partially or even completely blocked, which can also cause changes in the exhaust gas flow to reduce the conversion rate.

Affects exhaust emissions.

Urea can not be used completely, resulting in waste urea spray unevenly distributed. Finally, the nozzle of the injection module is clogged. Ammonia gas is produced when urea crystallizes and decomposes in the case of high-temperature exhaust.

Cause secondary environmental pollution. Therefore, it is advisable to install evaluation equipment or take measures to avoid urea crystallization, and to clean the crystals in time to avoid crystallization of the vehicle's urea solution.

This is because the moisture in the air is relatively large, and the temperature of the exhaust pipe is relatively high, which causes the exhaust gas and moisture in the exhaust pipe to react and become such powder crystals.

It is a liquid in the car, which is discharged together with the exhaust pipe, and then appears in the cold, and the crystallization that appears, which is normal. Don't worry too much.

This is because the exhaust pipe of the car will release hot air during driving, and then it will form white crystals in a very cold environment.

It is because there are acidic substances in the things discharged from the car, and powder will be formed when encountering high temperatures, which is corrosive, and must be dealt with in time if found.

Because oil and water are emulsified, this phenomenon occurs, and it doesn't matter, it's normal.