What are the components of diesel vehicle urea?
3 Answers
Automotive urea is composed of 32.5% high-purity urea and 67.5% deionized water. Automotive urea is a liquid used in exhaust gas treatment technology to reduce nitrogen oxide pollution in diesel vehicle emissions. It is an essential product for heavy-duty diesel vehicles to meet the China IV emission standards. The function of specialized diesel vehicle urea is to reduce nitrogen oxides in vehicle emissions, lower pollution levels, and enhance the environmental friendliness of vehicles. Hazards of not adding urea: First, it pollutes the environment. Diesel vehicles without urea can have extremely adverse effects on the ecological environment, which is also prohibited by national laws and regulations. Second, it damages the SCR injection system. Long-term absence of urea may cause crystallization and blockage in the SCR system's nozzles, pipelines, and urea pump, or damage due to high temperatures. Third, it weakens engine power. This is not a direct result of not using automotive urea, but rather because the engine's electronic control system cannot detect urea injection, leading to excessive exhaust pollution, which then forcibly limits the engine's torque output. Implementation of related policies: In China, with increasing national emphasis on environmental governance, the treatment of diesel vehicle exhaust has gained more attention. Consequently, a series of policies and regulations have been introduced to reduce diesel vehicle exhaust pollution, with automotive urea being a product of current national environmental policies. Vehicle exhaust emissions pose significant hazards to both humans and the environment. Therefore, the China IV standards implemented in 2008 mandated the use of automotive urea in diesel vehicle emission reduction systems to mitigate the harm caused by vehicle exhaust.
I've modified quite a few diesel vehicles before, so I'm very familiar with them. The urea solution for diesel vehicles is actually AdBlue, whose main components are high-purity urea and water, with the ratio strictly maintained at the golden standard of 32.5% urea and 67.5% deionized water. Don't underestimate this solution—when it meets exhaust gases in the tailpipe, it triggers a chemical reaction that converts harmful nitrogen oxides into harmless water and nitrogen before emission. I remember once during a long winter trip, the urea tank nearly froze. Later, I learned that when temperatures drop below -11°C, a specialized antifreeze must be used. Nowadays, the bottled urea sold at gas stations must comply with national standards. If you try to save money by buying off-brand products, beware of nozzle clogging, as the repair costs could end up being much higher.
Friends in the freight industry should all know that AdBlue is essential for diesel vehicles. Its main components are automotive-grade urea and ultra-pure water in a specific ratio—the former purifies exhaust emissions, while the latter prevents scaling. Last time, a truck in our fleet had its warning light come on, and the inspection revealed crystallization blockage caused by adding tap water. The mechanic explained that urea purity must reach 32.5% to fully decompose nitrogen oxides, and for long-haul drivers like us operating in northern regions, antifreeze formulations are crucial. Nowadays, qualified products at gas stations clearly label the mixture ratio and freezing point.
