Knowledge-based tower type solar fused salt heat storage system fault diagnosis method

Abstract

The invention discloses a knowledge-based tower type solar fused salt heat storage system fault diagnosis method. According to knowledge-based fused salt freezing and blocking diagnosis, on the basisof vibration characteristic monitoring, the matching degree of actually-measured associated data and a database is combined, and compared with a traditional vibration monitoring mode, fault predictionis conducted on the fused salt heat storage system on the basis of the principle of influencing fused salt freezing and blocking, so that the prediction effect is improved; vibration fault knowledgeis obtained based on neural network learning training, compared with other algorithms, the method has real-time performance and robustness, the problems of infinite recursion and the like are avoided,and prediction accuracy is guaranteed; vibration monitoring of the tower type solar heat storage system can be achieved, occurrence and positions of fused salt freezing and blocking faults are predicted, dredging of fused salt and maintenance of the system are guided, economic losses and potential safety hazards caused by fused salt freezing and blocking are reduced, and the economical efficiencyand safety of operation of a tower type solar power station are improved.

Description

technical field [0001] The invention belongs to the technical field of tower solar molten salt heat storage systems, and in particular relates to a knowledge-based fault diagnosis method for tower solar molten salt heat storage systems. Background technique [0002] The tower-type solar thermal power generation system uses a certain number of heliostats to focus sunlight into the absorber of the absorption tower, and then generates high-temperature steam through the heat exchange of the working fluid to drive the steam turbine to generate electricity. The heat storage system is a tower-type solar thermal power generation system. key components of the system. Molten salt is a molten body formed after melting salts. Due to its superior physical properties such as high heat capacity and good fluidity, it has become a new type of heat exchange working medium that can replace water. However, the high freezing point of molten salt makes the system prone to freezing and blocking f...

AI Technical Summary

Problems solved by technology

However, the high freezing point of molten salt makes the system prone to freezing and blocking failures during operation, reduces heat transfer efficiency, increases thermal stress on the heating surface, and seriously affects the normal operation of the heat storage system. The monitoring and diagnosis of salt freezing blockage play a key role in improving the economy and safety of power generation systems

[0003] After testing the existing technology, it is found that there are few researches on the fault diagnosis of the heat storage system of the tower solar power station, and the common superheater fault diagnosis is mostly based on the phenomenon of uneven thermal stress on the heating surface. However, due to the normal power generation system The high temperature state during operation makes it difficult to monitor and calculate its temperature

At present, there are many researches on fault diagnosis based on vibration signals, but they are highly dependent on process data. Once data deviation occurs, the diagnosis effect will be unsatisfactory or even the danger of wrong diagnosis.

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