Research on Predictive Maintenance Mode of Air Preheater Based on Digital Twin

doi:10.12096/j.2096-4528.pgt.23054

Abstract

Abstract:

Objectives In order to solve the shortcomings of the traditional preventive maintenance method of air preheater in large thermal power unit, a general mode of predictive maintenance based on digital twin was proposed, and the digital twin system of air preheater was constructed based on digital twin technology. Methods The proposed system included physical entity of rotary air preheater, real-time data acquisition and analysis module, digital twin model construction module, thermal parameter state monitoring, rotor thermal field video and thermal deformation visualization and ash accumulation prediction module. By the real-time acquisition of temperature parameter state and video data, and through the temperature field, video image, air leakage calculation and other modules, the calculation of thermal parameters and the prediction of ash accumulation were realized. At the same time, the 3D configuration screen was used to display data in real time, continuously optimize the accuracy of thermal parameter calculation and ash accumulation prediction, and realize the automatic optimization of soot-blowing strategy. Results The proposed scheme realizes the state monitoring and dynamic control of the thermal calculation process of the air preheater, and solves the problem that the ash accumulation factor of the rotary air preheater in the existing power station affects the safe and reliable operation of the thermal power unit. Conclusions Through engineering testing of actual units, the proposed scheme effectively improves the operation and maintenance efficiency of the air preheater of thermal power units, verifies the feasibility of the proposed method, and provides technical support for the development of smart power plant systems in future.

Key words: thermal power unit, preventive maintenance, predictive maintenance, digital twin, air preheater

CLC Number:

TK 39

Wang LIU, Lian CHEN, Gaoyang GONG, Zhihua LI, Wenhua XUE, Jingang SHI, Jun XIE, Leilei LI, Rongcai YAO, Zhaopeng WANG, Yanxi YANG, Yi DENG, Chenhui ZHANG. Research on Predictive Maintenance Mode of Air Preheater Based on Digital Twin[J]. Power Generation Technology, 2024, 45(4): 622-632.

Figures/Tables 12

Fig. 1 Traditional model of equipment predictive maintenance

Fig. 2 Five-dimensional model of the digital twin

Fig. 3 Digital twin technology system

Fig. 4 General embodiment of the digital twin system for air preheater

Fig. 5 Integrated development environment architecture

Fig.6 The predictive maintenance system of the empty preset digital twins

Fig. 7 Interface of air preheater operation and maintenance platform based on digital twin

Fig. 8 3D model of the empty preconditioner

Fig. 9 Rod diagram of the degree of ash accumulation at the cold and hot ends

Fig. 10 Rotor temperature field

Fig. 11 Temperature distribution at the cold and hot ends

Fig. 12 Real-time curve of internal state change of empty preheater

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