December 15, 2019

SCR system sensor solution

Since the 1990s, the rigorous regulations on engine emissions in various countries have greatly promoted the development of engine technology.

China will implement State IV emission regulations on July 1, 2013. The National IV emission standard is the national fourth-phase vehicle pollutant discharge standard. The vehicle emission pollutants mainly include HC (hydrocarbon), NOx (nitrogen oxide), CO (carbon monoxide), PM (particles), etc. The application of technologies such as active layers of good catalytic converters, secondary air injection, and exhaust gas recirculation systems with cooling devices controls and reduces the standards for emissions of pollutants from cars to below specified values. There are also two major upgrades during the National IV era. One is the use of selective catalytic reduction (SCR) technology for the treatment of nitrogen oxides in tail gas using urea solutions; the other is through particle traps (DPFs). ) Or particulate catalytic converter (DOC), EGR (exhaust gas recirculation) technology that processes particulates produced by combustion.

At present, several large-scale diesel engine plants in China reduce the soot through the internal cleaning, and then use the SCR system to reduce the NOX emissions to meet the restrictions of the National IV emission regulations on soot and NOX. The SCR system includes: urea aqueous solution tanks, conveying devices, metering devices, injection devices, catalysts, temperature and exhaust gas sensors, and the like. The basic working principle of the system is that the exhaust gas enters the exhaust mixing pipe after exiting the turbine, and the urea dosing and spraying device is installed on the mixing pipe to inject the urea solution. Urea is hydrolyzed and pyrolyzed at high temperature to generate NH3. The system catalyst surface uses NH3 to reduce NOx, expel N2, and excess NH3 is also reduced to N2 to prevent leakage. Under normal circumstances, the consumption of 100L of fuel will consume 5L liquid urea solution.

Please choose the exactly model LCD for your iPhone. USE to replace faulty,defective,cracked,dead iPhone 5/5S/5C display screen full assembly. Professional instructions will save your much time to replace your old screen easily.

Notice: You need to transfer home button with fingerprint sensor,front camera, ear speaker and silver metal plate from your old iPhone.


Installation Notice:
1. Choose the RIGHT model and color
2. Make sure already disconnect battery cable or power off before installation. It could save your phone from short circuit or incorrect installation damage.
3. Please check the LCD and make sure the flex cable is in good condition and there is no debris on the connector.
4. The flex cable are very sensitive and frangible. DO NOT over-bend or use excessive force to tear it, Handle Carefully !
5. There are many screws when you replacing the assembly which are different in size and length. Make sure each screw are installed back to its ORIGINAL hole
6. Follow the Operation Guide or video online step by step if you are Beginner(also easy to install)

iPhone 5/5S/5C LCD Digitizer

IPhone 5 LCD Display,IPhone 5 LCD Display Touch Screen,IPhone 5 LCD

Shenzhen Aokal Technology Co., Ltd. , https://www.aokal.com