Some of these failures, such as not burning urea, nozzle clogging, and exceeding the standard, are caused by the failure of the urea solution, and the urea solution is not up to standard, but part of it is caused by improper transportation and storage.
Improper transportation and storage cause the urea solution to fail to meet the standard
Urea for vehicles is a 32.5% urea aqueous solution, which is mainly composed of the ratio of urea crystals and ultrapure water.
The urea crystals for vehicles are mainly purified from industrial urea. The main principles are:
1. At a temperature of 70-75 ° C, urea is hydrolyzed in an aqueous solution;
2. When the temperature is below 30 ° C, the urea is crystallized again from the aqueous solution;
3. For each hydrolysis and crystallization, the purity will be greatly improved. Generally, the industrial primary urea hydrolysis and crystallization can be used once to meet the standard requirements of automotive urea, and the output ratio is 1.5:1.
Ultrapure water, usually made of groundwater. Because tap water uses various bactericidal chemicals in the production process and is not easy to handle, it is not made of tap water. However, the presence of metal ions in ordinary water will have a toxic effect on the catalyst, and the water also contains impurities, insolubles, and deposits that can clog the nozzles, so do not add ordinary water to the urea solution.
Finally, the two are calculated according to the needs, and the purified urea and ultrapure water are thoroughly mixed in the container and then filled.
Cooling treatment of vehicle urea solution during transportation and storage
During transportation and storage, light and high temperature should be prevented. The transport temperature and storage temperature should be between -5 °C and 25 °C. In the summer, the urea solution for the vehicle should be cooled. If the tank seal is opened, it is very exciting. When ammonia smells, stop using it.
Vehicle urea storage period:
1, storage temperature ≤ 10 ° C, storage period of 36 months;
2, storage temperature ≤ 25 ° C, storage period of 18 months;
3, storage temperature ≤ 30 ° C, storage period of 12 months;
Therefore, the urea solution should be stored in a cool and ventilated place to prevent the urea from failing due to the volatilization of the active ingredients in the urea solution.
When urea is added to the vehicle, it is generally added to 90% of the volume. Because the urea solution will start to freeze at -11 °C, although the solution can completely freeze the solution at -20 °C for technical reasons, the volume will increase by about 7% when the urea is crystallized at a low temperature, so do not add urea solution to the urea tank. Too full.
Do not add ordinary water to the urea solution.
Some card friends think that burning urea will cost oil, which is a misunderstanding. The engine cylinder burns diesel oil, and the exhaust gas processor consumes urea solution. They do not affect each other. The consumption ratio of the two is 3%-5%. The engine consumes 100L of fuel and consumes 3-5L of vehicle urea. Instead of burning urea, it will limit the torque. The vehicle is weak.
Therefore, do not add ordinary water to the urea solution to prevent impurities from entering the urea solution. When used, it causes the urea nozzle to clog.
It is also very important that for the urea solution stored in tons of barrels, in addition to low-temperature ventilation, the storage environment should be shielded from light. The tons of barrels can be recycled and used for a long time, and must be installed with tons of barrels. There are mainly the following reasons:
1. The ton barrel is made of plastic material. When exposed to light for a long time, it will speed up the aging of the barrel and reduce the service life of the barrel.
2, the tons of barrel cover to protect the tons of barrels, to prevent the trucks filled with urea liquid accidentally smashed the tons of barrels, causing damage to the tons of barrels.
3, more tons of barrel cover protection, the outside rain, dust and other pollutants are less likely to enter the barrel to affect the quality of urea liquid.
4, there is also a very important point, tons of barrels do not install tons of barrel cover, long exposure to light conditions, the barrel is easy to breed moss, moss belongs to algae, itself contains chlorophyll can be photosynthesis, once the air in the moss The spores enter the tons of barrels. Under the conditions of light and water, they combine the carbon dioxide to synthesize the organic matter needed for growth, and continue to multiply. The more and more moss grows, affecting the quality of the urea solution.
The storage environment must be cold and ventilated
In order to ensure that the quality of the urea liquid is not affected in the storage, the storage environment must be low temperature and ventilated. Tons of barrels should be installed with tons of barrels to avoid the quality of the urea liquid due to storage reasons, or even failures. The urea solution not only does not achieve the effect of exhaust gas treatment, but also causes the engine to fail!
Reading volume: Source: Blue Environmental Technology Author: Cold autumnGlass Christmas Ball, Themed christmas balls,Gift
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