Diesel engine high pressure SCR ventilation and pressure stabilization system

A diesel engine high pressure SCR ventilation and pressure stabilization system, characterized by, comprising:

• an SCR reactor configured to denitrify from exhaust gas of the diesel engine;
• an air intake pipeline connected to an air inlet of the SCR reactor for circulation of compressed air and provided with a first control valve;
• an exhaust pipeline connected to an air outlet of the SCR reactor and provided with a second control valve;
• a pressure difference sensing device configured to detect a difference value between gas pressure in the SCR reactor and pressure on an exhaust side of the diesel engine;
• and
• a control device connected to the pressure difference sensing device, the first control valve, and the second control valve;
• wherein, the control device is configured to control the opening of the first control valve and the second control valve such that the SCR ventilation and pressure stabilization system starts to ventilate, and exhaust gas of the SCR reactor, the air intake pipeline, and the exhaust pipeline is pushed by the compressed air entering from the air intake pipeline so as to be discharged from the exhaust pipeline;
• the control device is configure to close the second control valve after the ventilation of the SCR ventilation and pressure stabilization system is completed, and control a flow rate of the compressed air entering the SCR reactor and whether to open the second control valve according to the pressure difference sensing device to maintain a gas pressure difference between the SCR reactor and an exhaust side of the diesel engine within a predetermined pressure difference range.