Fig. 1. Neural network training data and prediction results and errors

Fig. 2. Candle image and temperature measurement at working distance and comparison with thermocouple

Fig. 3. Candle image and temperature results at 70 mm distance

Fig. 4. Main equipment map

Fig. 5. Image processing result

Fig. 6. Distribution of combustion environment temperature and pulverized coal temperature along the height of the nozzle

Fig. 7. The average temperature of coal-fired particles is distributed along the height of the nozzle