| Summary: | Objectives Power plant boilers often experience severe fouling and slagging issues on the heating surfaces when burning Zhundong coal. Therefore, the deposition and shedding characteristics of Zhundong coal ash on the heating surface were studied. Methods A deposited ash erosion model based on particle adhesion energy is established, and numerical simulations are then conducted to examine the dynamic deposition and shedding processes of Zhundong coal ash on a single tube. Results The model incorporating the coupled erosion mechanisms has a deviation of only 3.3% compared to the experimental results, demonstrating high accuracy. Besides, the shedding rate of the deposited ash increases initially but then levels off. However, within the simulated timeframe, only 25% of the deposited ash can be removed. In addition, the accumulation of deposited ash leads to a gradual increase in the heat transfer loss rate of the heating surface, with the average heat transfer loss rate during a 6-hour period being 1.76 times that of a 1-hour period. Furthermore, the adhesion energy of the deposited ash after 6 hours is 6.11 times that after 1 hour, and the corresponding mass flow rate of air at the soot-blowing outlet needs to be increased by 1.85 times to effectively remove all the deposited ash. Conclusions These findings enhance the understanding of the dynamic deposition and shedding processes of Zhundong coal ash and offer important research data and theoretical support for optimizing soot-blowing operations in industrial applications.
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