Detection method and detection device for damage to SCR (selective catalytic reduction) tank

Abstract

The invention provides a detection method and a detection device for damage to an SCR (selective catalytic reduction) tank. An operator can conveniently regulate the running state of the SCR tank or perform pipeline checking to prevent the excessive emission of downstream NOx and ammonia leakage according to a detection result. The detection method comprises the following steps: acquiring a maximum pressure difference between the two ends of the SCR tank during a current driving cycle; judging whether the acquired maximum pressure difference is greater than a theoretical value of the maximum pressure difference between the two ends of the SCR tank or not, and if the acquired maximum pressure difference is greater than a theoretical value of the maximum pressure difference between the two ends of the SCR tank, determining that the SCR is damaged. The detection device comprises a controller and a pressure different acquisition device in signal connection with the controller, wherein the pressure difference acquisition device is used for acquiring the maximum pressure difference between the two ends of the SCR tank during the current driving cycle; the theoretical value of the maximum pressure difference between the two ends of the SCR tank is pre-stored in the controller, and whether the SCR tank is damaged or not is judged according to a relationship between the acquired maximum pressure difference and the theoretical value. According to the detection method and the detection device, the pressure difference is used for judging whether the SCR tank is damaged or not; the detection method and the detection device are higher in accuracy and easy and convenient to operate, and damage to the SCR tank can be conveniently and timely discovered.

Description

technical field [0001] The invention relates to the technical field of air purification treatment, in particular to a method for detecting damage to an SCR box. The present invention also relates to a detection device for detection by the above method. Background technique [0002] The SCR (selective catalytic reduction, selective catalytic reduction) system can be divided into three parts: the urea injection system for injecting urea, the SCR box assembly for catalytic noise reduction, and sensors and other components. The role of the SCR is to convert NOx into N 2 , to reduce the downstream NOx emissions, so that the NOx emissions can meet the legal requirements, and at the same time ensure that the downstream NH3 leakage cannot exceed the value required by the emission regulations. [0003] If the SCR box is damaged, the NOx emission will exceed the standard. In the market, due to factors such as poor engine operating environment, poor air filter effect, and SCR box qu...

AI Technical Summary

Problems solved by technology

In the market, due to factors such as poor engine operating environment, poor air filter effect, and SCR box quality problems, the SCR box is seriously blocked.

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