Device and method for monitoring blocking area of air preheater

The invention provides a device and a method for monitoring a blocking area of an air preheater. The device comprises a flow speed monitoring device and a compartment positioning device, the flow rate monitoring device is used for monitoring the dynamic pressure of gas flowing through each partition bin in the preheater rotor; the partition bin positioning device comprises a positioning device and a signaling device, the signaling device and a preheater center cylinder rotate synchronously, the positioning device is arranged on one side of the signaling device, the signaling device comprises a plurality of sub-signaling devices in one-to-one correspondence with partition bins, and under the condition that the distance between each sub-signaling device and the positioning device meets a preset condition, the positioning device is triggered, and the partition bins are positioned in the partition bins. The compartment number recording module is used for dynamically recording compartment numbers of compartments;