Blockage of SCR is a common problem. Due to the poor working environment of SCR catalytic converter and its chemical transformation and reduction characteristics, various faults will occur in the process of use. For example, it is likely that the engine power decline, flameout or starting difficulties and excessive exhaust gas caused by the blockage of the SCR catalytic converter are likely to interfere with our fault diagnosis. A serious blockage of the SCR catalytic converter can cause the exhaust pipe to burn red and even cause the vehicle to spontaneously ignite.
 
SCR catalytic converter blocking phase.
 
1. The first stage is a mild blockage stage: the chemical complex and carbon deposition are adsorbed on the surface of the catalyst. It only shows the reduction of exhaust purification. Exhaust emissions exceed the standard.

2. The second stage is moderately blocked stage: the chemical complex and carbon deposition have accumulated to a certain extent on the surface of the catalyst, and the exhaust back pressure is increased at this stage. Fuel consumption increases and power decreases.
 
3.The third stage is the stage of serious blockage. Because of the serious blockage, the working temperature of "SCR catalytic converter" is increased. At the front end of SCR catalytic converter, high temperature sintering is blocked.
 
4. The fourth stage is the high temperature sintering jam. There are two kinds of high temperature sintering blockage: a kind of sintering blockage for chemical synthesis. One kind of coking blockage of carbon sintering. In the fourth stage, the power will be severely reduced, often flameout, and the exhaust pipe will burn red when serious, and even cause the vehicle to spontaneously ignite.
 
How to clean the SCR catalytic converter?
 
The blockage of SCR catalytic converter will cause the car to exhaust gas, the back pressure will increase, the vehicle fuel oil, the power will decrease, the serious will block, causing the vehicle to spontaneously combust. Therefore, the SCR catalytic converter can be cleaned regularly to improve the emission and reduce the emission. Independent research and development of wuhan brown from SCR catalysts cleaning machine, applicable countries four or five passenger, cargo, heavy vehicles post-processing system (SCR, DPF particle trap, three yuan catalysts) cleaning equipment; Form a complete set of special nozzle to various parts of carbon deposition, urea crystal particles and to conduct a comprehensive cleaning, make the hair SCR system components to restore to good strong condition, so as to achieve the aim of increasing power, reduce exhaust.