According to the intelligent diagnosis method and device for the operation state of the
air preheater, by constructing a multi-mode
state recognition and trend pre-judgment
system of the
air preheater, three operation states of'normal ', 'slight anomaly' and'serious anomaly 'can be quantitatively distinguished, historical trend
visual comparison is supported, and scientific making of a
maintenance plan is assisted; a modeling and multi-parameter combined judgment mechanism is adopted, manual experience is effectively replaced, low-probability and high-risk fault symptoms are accurately captured,
false alarm and missing alarm are remarkably reduced, and dependence on manual inspection is reduced; each module of the
system supports independent modeling and dynamic updating, has good adaptability and expandability, and is suitable for different units, capacities and manufacturer equipment; through early warning of hidden dangers such as blockage, leakage and aging in advance, non-planned furnace shutdown is avoided, meanwhile, the operation and maintenance
rhythm is optimized, the operation resistance and
energy consumption are reduced, the heat exchange efficiency is improved, and therefore the reliability and economical efficiency of equipment operation are enhanced.