The correct use of urea for vehicles
As a high-frequency vocabulary after the implementation of the National Four, the urea solution for vehicles began to heat up at the beginning of the year. Many card friends have asked if the urea used in the car can be replaced by agricultural urea and pure water. The answer is not to be replaced. Urea for vehicles can only buy urea solution that meets the corresponding standards on the market. Urea for vehicles cannot be replaced with agricultural urea or pure water. Urea solution is a stable urea solution (from 32.5% high purity urea and 67.5% deionized water). Composition), used to reduce nitrogen oxides in the exhaust gas after combustion in automobiles.
Ordinary fertilizer urea contains poisonous urea, mechanical impurities, formaldehyde, and metal ions, which may cause poisoning of the catalyst of the SCR tail gas after-treatment processor and cause damage to the parts. Moreover, we searched through the Internet and found that the value of the urea pump was 10,000 yuan. If the damage could not be recovered, it would be a big loss for the user.
In addition, because the fertilizer urea is easy to crystallize at low temperature and cannot guarantee the concentration of the urea solution, the conversion rate of nitrogen oxides is low. In addition, ammonia loss can damage the SCR system, making it impossible for vehicles to meet emission standards. A common practice for cheating in the country is to bypass the OBD monitoring and replace the urea solution with water to ensure the normal operation of the engine. Because the engine of the National SCR route is fully burned, the NOx content of the discharge is relatively high.
Nitric acid produced by the combination of NOx and water in the air is a major cause of acid rain. At the same time, NOx will cause photochemical smog pollution with other pollutants under the action of ultraviolet rays. It is very harmful to the atmosphere and thus has a great impact on human health. Therefore, the act of adding water instead of urea should be denied and resisted.
The choice of urea for vehicles, the urea solution for vehicles is also known in China. According to the European name, it is called "Adblue" solution, while in North America, it is also called DEF diesel discharge treatment liquid. It is also called the diesel engine nitrogen oxide reducing agent in China. Vehicle denitration agent .
Most diesel vehicle manufacturers tend to use a 32.5% aqueous urea solution (AUS32) as a reducing agent. The concentration of urea directly affects the reduction rate of nitrogen oxides and the crystallization point of the urea solution. Too high or too low a concentration can not only improve the conversion efficiency of nitrogen oxides, but will cause secondary pollution of the remaining ammonia gas. The concentration of 32.5% was chosen because the vehicle urea solution had the lowest crystallization point at this concentration (freezing point -11 ° C).
The urea solution needs to avoid impurities entering the solution and the urea tank as much as possible during the filling process. Generally, the urea solution has a special tube when it is filled. Just open the urea tank and insert the filling tube. However, some people usually pay little attention to bring impurities into the tank and block the urea tank urea pump. In order to prevent impurities, pure water must be used to clean the SCR, and tap water is not available.
Proper use of vehicle urea , urea is alkaline, corrosion of copper, cast iron, solder, cast aluminum. Improper spillage of urea can contaminate tanks and vehicles. In addition, although urea itself does not cause significant harm to the eyes and skin, it also causes slight irritation to the human body. If in contact with the skin, rinse the exposed skin with plenty of soap or water. If it comes into contact with the eyes, open the upper and lower eyelids and rinse with water.
At present, the national four models have used a urea filter to filter out impurities in the urea solution and protect the SCR aftertreatment system. Storage should be protected from light and dust - use as soon as possible after opening, to avoid excessive temperature and low temperature. We can see the temperature affected. According to the table, most of the domestic areas store urea solution. The shelf life is half a year and three years. Wait. The performance of the product is stable for half a year.
Urea needs to be protected from light and high temperatures during transportation. The optimum transport and storage temperature should be between -5 °C and 25 °C. In addition, the urea for vehicles will crystallize when the temperature is low, and the volume expansion will increase to 7%. If the urea is too full, it will remain below 90% of the storage volume ratio. High temperatures can cause decomposition of urea, which is generally associated with the storage temperature of urea.
If the urea is stored in a place where the dust is full, the solution is contaminated with impurities. When driving, it is usually also a few barrels of urea to prevent the urea solution from running out of power. During the carrying process, the card friend needs to carry out the necessary anti-shock measures for the urea packaging to avoid the leakage of the road bumps and corrosion of the vehicle. The urea solution is easily contaminated by impurities after being opened or is exposed to algae after being exposed to sunlight. Moreover, the decomposition of urea itself produces ammonia loss, which causes the solution to volatilize and cause urea to deteriorate. According to the recommendations of the domestic urea solution manufacturer, if it is packaged after opening, it will be stored as required and used up within 30 days .
We can see that the concentration of the urea solution used in the vehicle and the presence or absence of impurities are essential for tail gas treatment. If water, agricultural urea, purchased non-standard "cottage" urea solution is used, or the qualified urea solution is deteriorated during storage and filling. It not only affects the conversion efficiency of nitrogen oxides but also causes the loss of ammonia gas, even directly destroying the SCR system, affecting the normal operation of the vehicle, and failing to meet the emission standards.
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