Air preheater cold end monitoring system and monitoring process

The invention discloses an air preheater cold end monitoring system and a monitoring process. A plurality of probe assemblies are arranged on a rotor cold end middle beam of an air preheater; a rotor positioning detection device is arranged to detect a starting point signal and rotating speed information of the rotor, and a controller outputs a shooting instruction according to the signals to control the probe assembly to shoot so as to obtain required rotor image information; and an image recognition part is arranged to receive and process rotor image information and output the rotor image information to a visual monitoring platform, the visual monitoring platform carries out visual display of a rotor cold end according to the obtained image processing information, and automatic early warning of the state performance of the cold end rotor can be obtained through comparison of images in different periods. The conditions of blockage, corrosion, open fire, heat storage element abrasion and the like of the cold