The exhaust emissions from diesel engines are primarily composed of NOx and carbon particles. While carbon particles can be relatively easily filtered out through the exhaust system, nitrogen oxides (NOx) have strong pollutant properties that can affect human health and even lead to acid rain. Therefore, to reduce the emission of nitrogen oxides, vehicles need to use urea.
What is the role of urea?
In diesel vehicles, urea can convert the nitrogen oxides in the exhaust into harmless gas and water through a process called Selective Catalytic Reduction (SCR). This technology effectively reduces the emission of harmful nitrogen oxides from vehicle exhaust.
How to use urea?
Urea is directly applied to diesel engines and catalytically reduced using SCR technology. When nitrogen oxide is detected in the exhaust pipe, the urea tank automatically sprays the treatment fluid, converting it into harmless gas and water before being emitted. Typically, around 5 liters of urea is consumed per 100 liters of diesel to ensure proper catalytic effect. It is essential to use automotive-grade urea that meets the required specifications.
The importance of environmental protection：
Vehicle exhaust contains pollutants such as chlorides, which severely impact air quality. Urea reacts chemically with chloride pollutants in the exhaust, producing harmless ammonia and water, thus reducing harm to humans and the environment. Therefore, vehicles must add urea to meet emissions limits for chlorides; otherwise, they may face penalties.
Precautions for using urea：
When adding urea to vehicles, it's important to consider hygiene to avoid dirt blocking urea pipelines, which could affect the catalytic reduction effect. Automotive urea is a mixture of high-purity urea and ultra-pure water in certain proportions. It is non-toxic but has weak alkalinity, and can cause irritation to the eyes and skin, so it is essential to take necessary precautions when handling.
