Low-temperature urea crystal simulation test system for SCR catalytic silencer

Abstract

The invention relates to a low-temperature urea crystal simulation test system for an SCR catalytic silencer. The system comprises a hot air system, a urea jetting system, a nozzle cooling system and a to-be-tested SCR catalytic silencer, wherein the hot air system comprises a hot air device, a hot air pipeline and a throttle valve; the urea jetting system comprises a urea pot and a jetting pump; and the nozzle cooling system comprises a cooling pump, a pump water inlet pipe, a pump water outlet pipe, a nozzle cooling water inlet pipe, a water pool and a nozzle cooling water outlet pipe. According to the invention, the hot air system is used for simulating the exhaust of a diesel engine, the urea jetting system is used for simulating the urea jetting volume of the urea when the SCR catalytic silencer works, and the nozzle cooling system is used for controlling the temperature of the urea entering the SCR catalytic silencer, so that the purpose of simulating the low-temperature working condition of an engine pedestal is achieved, and the simulated low-temperature working condition of the engine pedestal is utilized to realize the urea crystal test for the SCR catalytic silencer in a low-temperature state.

Description

[0001] Technical field: [0002] The invention relates to the technical field of performance testing of automobile SCR catalytic muffler equipment, in particular to a low-temperature urea crystallization simulation test system for an SCR catalytic muffler. [0003] Background technique: [0004] With the acceleration of my country's economic development and infrastructure construction, my country's automobile production has increased from 3.2512 million in 2002 to 18.4189 million in 2011, an increase of nearly 6 times. At the end of 2002, the number of civilian vehicles in my country just exceeded 20 million; at the end of 2011, the number of civilian vehicles reached 106 million. The increase in the production and ownership of automobiles has led to more and more serious pollution from exhaust gas. With the country's increasing emphasis on energy conservation and emission reduction, realizing energy conservation, low carbon, and environmental protection has become the core go...

AI Technical Summary

Problems solved by technology

[0005] SCR catalytic mufflers play a dominant role in the treatment of diesel engine exhaust, and low-temperature urea crystallization has always been an important problem that plagues low-temperature exhaust treatment. If low-temperature engine exhaust is not treated, it will not be able to meet the requirements of national regulations on diesel engine exhaust treatment; Under low temperature conditions, the pyrolysis and hydrolysis of urea in the SCR catalytic muffler is insufficient, which will easily cause crystallization and block the muffler, thus affecting the exhaust gas treatment of the diesel engine at low temperature; Exhaust gas treatment effect of SCR catalytic muffler at low temperature

At present, the urea crystallization test of the SCR catalytic muffler at low temperature needs to be carried out on the diesel engine bench, which requires a lot of preparation work, long working cycle, high requirements, and extremely high cost, resulting in high test cost and low test efficiency.

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