SCR catalyst deterioration test device and test method

[0020] Example 1: See figure 1 The present invention provides a technical solution: an SCR catalyst deterioration test device, including a diesel engine, a diesel engine and an exhaust pipe, and an electric three-way valve, electric three-way valve is provided in the outer side of the exhaust line of the diesel engine. The urea injection device is mounted, and one side of the exhaust pipeline is provided with a bypass line. The outer side surface of the bypass line is provided with another electric three-way valve, and the arrangement of the bypass line facilitates the intake detection of the test. The flow rate makes the test more accurately, the urea injection device includes a metering pump, a damper and a gun, and an exhaust flow meter is provided between the electric velvet valve and the urea injection device. The urea injection device is mounted after the mixer, one side of the mixer The electric heater is provided, and the mixer is provided with a catalytic device. The catalys

[0027] Example 2: Test method of a SCR catalyst deterioration test device, including the following steps:

[0028] S1: Start the diesel engine to a specific condition, the electric three-way valve is adjusted to the flow of the exhaust line, and the flow rate flowing through the catalytic device is measured by the exhaust flow meter 900m. 3 , Pass NO X Sensor detects NO from diesel discharge gas X The content is 0.5kg / m 3 ;

[0029] S2: Spray 500 mL / h urea, urea and exhaust gas in the mixer by the urea injection device.

[0030] S3: Before the mixed exhaust gas enters the catalytic device, the exhaust temperature of the catalytic device is measured by the temperature sensor, and if the exhaust temperature does not reach a predetermined standard 550 ° C, the exhaust gas flowing through the catalytic device is heated by activating the electric heating device. To 550 ° C;

[0031] S4: after passing NO X The sensor detects NO in the catalytic reaction X The content is 0.22kg /