What causes AdBlue to crystallize?

What causes AdBlue to crystallize?

Crystallisation is a problem that can arise when the exhaust gases are not hot enough to react properly with AdBlue so that it does not completely turn into ammonia. When this happens, cyanuric crystals can form which can contaminate the system and bring the vehicle to a standstill.

How do you clean AdBlue crystallization?

Daily maintenance of the Adblue tank is as follows: clearing the Adblue tank every half year, cleaning the Adblue tank with 80 degrees boiled water. The solving of the problem for the nozzle is the same. Immersing the nozzle into the boiled water when urea crystallization appeared, problems will be solved.

Why does DEF fluid crystallize?

DEF crystallizes when stored for prolonged periods as the water evaporates. ... At that point, the tank should accept one full 2.5 gallon container of DEF. There is no need to continuously top off the DEF tank. Use the filler tube supplied with the case to avoid spills or splashes.

How do I stop DEF from crystallizing?

How do you prevent "DEF creep"? Make sure all fittings that come in contact with DEF are tight and proper seals are used. Try minimizing breaking connections and wipe down any urea crystallization as soon as it forms. Water can be used to easily wash off urea that has crept onto the truck, tank or dispensing equipment.

How do you dissolve urea crystals?

Acetic acid aqueous solution of 50% - 80% mass percent concentration is soaked at temperature of 30 celsius degrees to 50 celsius degrees to dissolve urea crystals and then the urea crystals are cleaned by water, and so removing of urea crystals on the pipeline wall is realized.

Can I use water instead of AdBlue?

Using water instead of AdBlue - In short, you mustn't use water instead of AdBlue, or water down the AdBlue in anyway. AdBlue is a mixture of urea and 67.5% de-ionized water. Where as tap water contains a lot of minerals and ions that is harmful to the vehicle exhaust treatment system.

Can DEF crystallize?

A 32.5% solution of DEF will begin to crystallize and freeze at 12 deg F (-11 deg C). At 32.5%, both the urea and water will freeze at the same rate, ensuring that as it thaws, the fluid does not become diluted, or over concentrated. The freezing and unthawing of DEF will not cause degradation of the product.

How do you clean DEF crystals?

If you spill a small amount of Diesel Exhaust Fluid (DEF), it can be washed away with water or wiped up. If you leave it to dry it will turn into white crystals. These can be washed away with water. If you spill a large amount of DEF then contact your DEF supplier for advice.

What happens if you overfill DEF fluid?

The main reason not to overfill is because def fluid will freeze as it is mostly water. If the tank is overfull and freezes it could crack and leak.

What neutralizes DEF fluid?

If you're thinking, “Urea. ... But despite DEF earning the nickname “pig urine,” Diesel Exhaust Fluid is actually made of commercial-grade urea—synthetic ammonia and carbon. So, to simplify things: the urea and water in DEF heat up, producing ammonia. This ammonia then breaks down and neutralizes the NOx gases.

Why does the crystallization of AdBlue® fail?

• Over time, the crystallization of AdBlue® will be blocked due to the incomplete emptying of the pipeline of the AdBlue® production equipment. 3. The filter element of AdBlue® pump has not been replaced regularly.

Why AdBlue® can not be hydrolyzed at high temperature?

• Generally, the working pressure of air-assisted urea injection is relatively high, so it may occur that the nozzle valve needle is not closed tightly, resulting in the low exhaust temperature stage of the work still working, AdBlue® can not be hydrolyzed at high temperature so as to crystallize rapidly.

What are the common problems of AdBlue® nozzles?

• The air-assisted AdBlue® nozzle is usually open, and its atomization is assisted by air pressure, such as the malfunction of the pressure pipeline of AdBlue® pump or the explosion and cracking of the nozzle at high temperature. It will cause poor spray atomization, resulting in crystallization blockage.

What is crystallization and how does it work?

• Crystallization is a technique which chemists use to purify solid compounds. It is one of the fundamental procedures each chemist must master to become proficient in the laboratory. Crystallization is based on the principles of solubility: compounds (solutes) tend to be more soluble in hot liquids (solvents) than they are in cold liquids.