Boiler early warning method under low-load working condition

The invention discloses a boiler early warning method under a low-load working condition, and relates to the technical field of power plant equipment management, and the method comprises the steps: analyzing flue gas components at different moments, and generating a plurality of corresponding groups of the components; constructing an air volume change curve according to the real-time air volume of different air ducts, generating a pulverized coal change curve according to the real-time pulverized coal injection amount, associating the component corresponding group with the air volume change curve and a time node corresponding to the pulverized coal change curve, and intercepting an air volume change characteristic section and a pulverized coal change characteristic section before and after the time node; and taking the component corresponding group as a retrieval object, determining an air volume standard change characteristic and a pulverized coal standard change characteristic in a preset combustion quality