Boiler expansion identification method and device based on boiler digital twin system

The invention provides a boiler expansion identification method and device based on a boiler digital twinning system. The method comprises the steps that the boiler digital twinning system is constructed; a camera comprising an adjustable laser range finder is arranged at a fixed position capable of shooting the expansion dead point of the boiler, and the fixed position is mapped into the system; determining a to-be-identified three-dimensional area in the system, selecting a plurality of measuring points, and calculating a theoretical distance from each measuring point to a fixed position; an image of the boiler is shot, and the actual position of each measuring point is determined based on the mapping relation between the projection on the plane in the three-dimensional area and the image; the laser range finder is adjusted according to the actual positions of the measuring points, the actual distance of each measuring point is measured, and the expansion degree of each measuring point is calculated by the