A dynamic model on high-temperature corrosion with fouling-type ash deposition was established to predict the thickness distribution of corrosion layer and the outer/inner layer of ash deposit. It provides an observation on variation of heat transfer characteristics of the alloy test probe over time. This model involves the combustion characteristics of high-chlorine coal, the process of formation, migration, and deposition of fly ash particles, and the corrosion of alloy test probe. In this study, the dynamic model has been integrated into the numerical simulation of high-chlorine coal combustion in a 50 kW long-period corrosion test furnace. The prediction results show that the amount of fly ash deposition on the windward surface is the most while the least amount appears on the side surface. There is a great correlation between the corrosion layer and the inner layer of ash deposit. Because the inner layer of ash deposit and the alloy substrate are spatially adjacent, the high temperature corrosion process is greatly affected by the growth and property of fly ash deposit layer. The simulation results show that the heat flux of probe surface beneath ash deposit is 2.5 kW/m² which is 50% of the clean surface (5 kW/m²). The changing pattern of thermal resistance versus time at different positions of the alloy surface is consistent with the variation of thickness of the corrosion layer and ash deposit layer. The windward face has the highest thermal resistance and the least heat flux due to the highest thickness of the corrosion layer and ash deposit layer. With the increase of probe wall temperature, the ratio of thermal resistance of corrosion layer to total heat transfer resistance increases, and the ratio at the side face is larger than that at other locations. And the proportion of the corrosion layer in thermal resistance for alloy TP347H reaches 8% at the probe wall temperature of 973 K.

建立了带有结垢型灰渣沉积物的高温腐蚀动力学模型，以预测灰渣沉积物腐蚀层和外/内层的厚度分布。它提供了合金测试探针的传热特性随时间变化的观察结果。该模型涉及高氯煤的燃烧特性，粉煤灰颗粒的形成，迁移和沉积过程以及合金测试探针的腐蚀。在这项研究中，将动力学模型集成到了50 kW长周期腐蚀试验炉中高氯煤燃烧的数值模拟中。预测结果表明，迎风面上的粉煤灰沉积量最多，而侧面上的粉尘量最少。腐蚀层与灰烬沉积的内层之间存在很大的相关性。由于粉煤灰沉积层的内层和合金基底在空间上相邻，因此高温腐蚀过程受粉煤灰沉积层的生长和性能的影响很大。仿真结果表明，灰渣下探头表面的热通量为2.5 kW / m²是清洁表面的50％（5 kW / m ²）。在合金表面的不同位置，热阻随时间的变化规律与腐蚀层和灰沉积层厚度的变化是一致的。由于腐蚀层和灰烬沉积层的厚度最大，因此迎风面具有最高的热阻和最小的热通量。随着探头壁温度的升高，腐蚀层的热阻与总传热阻的比值增加，侧面的比值大于其他位置。探针壁温为973 K时，TP347H合金的腐蚀层在热阻中的比例达到8％。