Knowledge-based fault diagnosis method for tower solar molten salt heat storage system

Abstract

The invention discloses a knowledge-based fault diagnosis method for a tower solar molten salt heat storage system. Knowledge-based diagnosis of molten salt freezing blockage, based on the monitoring of its vibration characteristics, combined with the matching degree of the measured correlation data and the database, compared with the traditional vibration monitoring method, from the principle of affecting molten salt freezing blockage The thermal system performs fault prediction to improve the prediction effect; based on neural network learning and training, the acquisition of vibration fault knowledge is real-time and robust compared with other algorithms, and it avoids problems such as "infinite recursion" and guarantees prediction accuracy; the present invention can realize the vibration monitoring of the tower solar heat storage system, predict the occurrence and location of molten salt freezing faults, guide the dredging of molten salt and the maintenance of the system, and reduce the damage caused by molten salt freezing Economic losses and potential safety hazards, improve the economy and safety of tower solar power plant operation.

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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