With the approaching of the implementation of the fourth national emission standard for non-road machinery，

All kinds of construction machinery with the fourth national emission standard have been introduced to the market one after another.。

Today, I would like to share a few with you.

A little knowledge about the accessories of the fourth national automobile：

 

Guo Si

The fourth national standard is the fourth phase of the national emission standard for construction machinery pollutants.，The main pollutants emitted by vehicles areHC（Hydrocarbon）、NOx（Oxynitride）、CO（Carbon monoxide）、PM（Particles）Etc，Through a better active layer of the catalytic converter、Application of technologies such as secondary air injection and exhaust gas recirculation system with cooling device，Standards for controlling and reducing vehicle emissions to below specified values。

One、Tips for the Fourth National Congress of the Communist Party of China

1、Refuel and add urea solution.

Compared with the third national vehicle, the fourth national vehicle mainly increases the exhaust treatment device.，Diesel oxidation catalyst is used for Lingong products.（DOC ）+Selective catalytic reduction device（SCR）+Particle trap（DPF）The design of，Urea solution is constantly consumed when the vehicle is working，Therefore, in addition to refueling, urea solution should be added regularly.。

The urea solution is stored at a temperature of-5℃～25℃In the environment of，Avoid direct sunlight，Strict exposure to the sun，High temperature will shorten the warranty period of urea solution，Low temperatures can cause the urea solution to freeze.、Crystallization。

  

2、High grade of oil for maintenance

The engine oil of the fourth national car should be used.CKGrade and above oil product。

  

3、The tail gas treatment device should also be maintained regularly.

The filter element of urea pump and the filter element of urea tank sensor are added to the maintenance details of the fourth national vehicle.，Remember to replace the filter element of the tail gas treatment device regularly.。

  

4、Unqualified fuel cannot be added

Due to the advanced exhaust treatment equipment used in the fourth national car，The requirements for fuel are stricter.，If substandard fuel is used，Easy to causeDPFBlockage、DOCDeterioration、SCRDeterioration，Resulting in a reduction in engine power、Engine torque and speed limit、Increased fuel consumption、The emission exceeds the standard、Carbon Deposition and Black Smoke，Even complete damage to parts.，The loss outweighs the gain。

 

Two、China IV urea solution

 

In the countryIVAdding vehicle urea into the vehicle urea tank，Under the action of the controller， Through the urea pump-Metering and supply device-Urea injection device，It is injected into the tail pipe of the vehicle.，Mixing with fuel tail gas to generate chemical reaction，Pass by againSCRCatalytic converter filtration，So as to reach the countryIVEmission standards，Vent the tail gas to air。Therefore, it is a consumable that must be used in construction machinery.。

Harm of inferior urea solution

Does the quality of urea solution affect its use?？The answer is inevitable.。Coming up，I will tell you about the harm of inferior urea.？

 

Hazard 1

Damage to the urea nozzle

The urea nozzle is located in the exhaust pipe.，Long-term exposure to high temperatures，When it works, it is cooled by the circulation of urea aqueous solution.，If the cooling effect of the urea aqueous solution is not obtained,，The urea nozzle is prone to damage。

Hazard 2

The metering pump is damaged

Inferior aqueous urea solution，Its concentration is not up to standard.，It will lead to the failure of excessive emissions.，The result is an immediate reduction in engine torque，The vehicle is weak，It raises the freezing point of the solution.。Under cold condition，May cause the metering pump to freeze.。

 

 

Hazard 3

Resulting in crystallization"Urea stone"

Do not use or use inferior urea aqueous solution for a long time，Crystallization of urea will block the pipeline.、A spray head and a pump body，Cause partial or complete system damage。In addition, in the tail gas treatment device,，The nozzle is exposed to high ambient temperatures，If it works properly.，Urea can play a certain cooling role.，If it stops working，It burns out easily。

Hazard 4

Damage to urea pump

In fact, the production standard of urea aqueous solution is strict.，Is by 32.5%High-purity urea and 67.5%Composed of deionized water，Some enterprises in order to reduce production costs.，Ordinary water is used instead of deionized water，Urea aqueous solution produced without deionized water，The impurity content will exceed the standard.，Plugged filter、Urea solution delivery pipe and nozzle，LowerSCRSystem atomization effect，Excessive impurities can also damage the urea pump.。

Influencing factors

Urea contentDirect impactNOxCatalytic efficiency and freezing point of urea solution。AtSCRRestore the system， The concentration of urea solution is one of the key factors.，Too high or too low concentration not only can not be improvedNOxConversion efficiency，On the contrary, it will cause the slip of ammonia.（Due to excessiveNH₃/NOxAmmonia gas leakage caused by ratio），Forming secondary pollutant ammonia。

Alkalinity：Urea in acid、Alkali、Under the action of enzymes（Acid、Alkali needs to be heated）Can be hydrolyzed to produce ammonia，Too high alkalinity indicates that part of urea is impure or has been decomposed.，This index controls the ammonia content in urea.。

Biuret：Biuret is a by-product of urea production.，Secondly，If not stored properly，Urea solution is easily condensed into biuret.。Biuret as an impurity in urea solution，It should be strictly controlled。

Insoluble matterIt is a water-insoluble impurity in urea solution.，Its existence is harmful to the blockage of the urea solution infusion pipeline and nozzle.。

Temporary urea solution

Shandong Lingong urea solutionHigh quality and high efficiency，Suitable for long-term use of various models of Shandong Lingong complete machine products and other complete machines of engineering machinery。Core science and technology benefit society，Precision technology leads the industry，“Super Filtration System” It is a patented urea solution technology independently developed by designated suppliers of Shandong Lingong.， Unique to the industry，GenuineAnti-crystallizationArtifact”，Let Millions of Construction Machinery Customers Use Reliable Urea Solution。

  

Super Filtration System

  

The purity of urea solution is an important index to distinguish the quality of urea solution.。Shandong Lingong urea solution“Super Filtration System”Adopt Japan's top high-tech materials，Realizing nanometer-level filtration of urea solution，The filtration accuracy is achieved5- 10 nm，It is about one hundred thousandth of the thickness of hair.，Effective filtration of extremely fine colloidal substances such as biuret，Delay from the sourceSCRCyanuric acid products produced by the system，KeepSCRSystem piping and nozzles are clean，MakeThe atomization effect of urea solution is good.、The tail gas is fully treated，Reduce consumption of urea solution，Safeguard the engineThe power is strong，Oil saving and efficiency increasing。

 

That's all for today's sharing.

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